Down-like cotton material and method for producing the same

Abstract

The present invention provides a novel down-like cotton material which is bulky, light-weight, excellent in washing resistance, heat-retaining property and heat insulation property and provides volume feeling, without odor from animals. The down-like cotton material 1 of the present invention is formed as a cotton-like long fiber, in which filaments of an axial fiber and a float each composed of a polyester raw yarn are united by air entangling in air flow to be entangled, connected and integrated to have a down ball-like mass in an aligned form, and the diameter of the down ball-like mass is 1.0 to 3.5 cm and down ball-like masses are continually aligned at an interval of up to about 10 cm or less in a length direction of the axial fiber.

1 . A down-like cotton material comprising an axial fiber and a float each composed of a polyester raw yarn, wherein filaments of the axial fiber and the float are united by air entangling in air flow to be entangled, connected and integrated to have a down ball-like mass, wherein the down ball-like mass has a predetermined diameter in an aligned form, and the down ball-like mass is continually aligned at a predetermined interval in a length direction of the axial fiber to form a cotton-like long fiber. 
     
     
         2 . A down-like cotton material comprising an axial fiber and a float each composed of a polyester raw yarn, wherein filaments of the axial fiber and the float are united by air entangling in air flow to be entangled, connected and integrated to have a down ball-like mass, wherein the diameter of the down ball-like mass in an aligned form is 1.0 to 3.5 cm, and the down ball-like mass is continually aligned at an interval of up to about 10 cm or less in a length direction of the axial fiber to form a cotton-like long fiber. 
     
     
         3 . A down-like cotton material comprising an axial fiber and a float each composed of a polyester raw yarn, wherein filaments of the axial fiber and the float are united by air entangling in air flow to be entangled, connected and integrated to have a down ball-like mass, wherein the diameter of the down ball-like mass in an aligned form is 1.0 to 3.5 cm, and the down ball-like mass is continually aligned at an interval of up to about 10 cm or less in a length direction of the axial fiber to form a cotton-like long fiber, and a silicone resin is fixed to the cotton-like long fiber to thermally stabilize the shape. 
     
     
         4 . The down-like cotton material according to  claim 1 , wherein the float is selected from a light-weight hollow yarn, a type C cross-section yarn and a modified cross-section yarn whose surface area is larger than that of the circular cross-section yarn. 
     
     
         5 . A method for producing a down-like cotton material comprising:
 a step of each feeding an axial fiber and a float each composed of a polyester raw yarn into a unit for air entangling;   a step of entangling by air to unite filaments of the axial fiber and the float by air entangling in a unit for air entangling in air flow to be entangled, connected and integrated to have a down ball-like mass, wherein a down ball-like mass in an aligned form has a predetermined diameter, and the down ball-like mass is continually aligned at a predetermined interval in a length direction of the axial fiber to provide a down-like cotton material as a cotton-like long fiber; and   a step of reeling the down-like cotton material.   
     
     
         6 . A method for producing a down-like cotton material comprising:
 a step of each feeding an axial fiber and a float each composed of a polyester raw yarn into a unit for air entangling;   a step of entangling by air to unite filaments of the axial fiber and the float by air entangling in a unit for air entangling in air flow to be entangled, connected and integrated to have a down ball-like mass, wherein the diameter of a down ball-like mass in an aligned form is 1.0 to 3.5 cm, and the down ball-like mass is continually aligned at an interval of up to about 10 cm or less in a length direction of the axial fiber to provide a down-like cotton material as a cotton-like long fiber; and   a step of reeling the down-like cotton material.   
     
     
         7 . A method for producing a down-like cotton material comprising:
 a step of each feeding an axial fiber and a float each composed of a polyester raw yarn into a unit for air entangling;   a step of entangling by air to unite filaments of the axial fiber and the float to be entangled, connected and integrated to have a down ball-like mass by air entangling in air flow externally fed formed between a tip nozzle portion of a nozzle tube portion and a mortar-like wall surface portion of a venturi in a unit for air entangling, wherein the diameter of a down ball-like mass in an aligned form is 1.0 to 3.5 cm, and the down ball-like mass is continually aligned at an interval of up to about 10 cm or less in a length direction of the axial fiber to provide a down-like cotton material as a cotton-like long fiber;   a step of reeling the cotton-like long fiber;   a step for processing a silicone resin for applying a silicone agent to the down-like cotton material;   a first heating step for heating the down-like cotton material having the silicone agent to remove moisture;   a second heating step for heating the down-like cotton material having no moisture and stabilizing the shape by thermal contraction; and   a step of cooling for cooling the down-like cotton material after a second heating step is completed.   
     
     
         8 . The method for producing a down-like cotton material according to  claim 7 , wherein the heating temperature of the first heating step is 100 to 149° C., and preferably 130° C., and the heating temperature of the second heating step is 150 to 200° C., and preferably 180° C. 
     
     
         9 . The method for producing a down-like cotton material according to  claim 7 , wherein the size of the down ball-like mass, the interval between down ball-like masses and the float density are changed in various ways by combining production factors such as the ratio of feeding the float to the axial fiber, the air volume and the air pressure for air entangling in the unit for air entangling, adjustment of the interval between a tip nozzle portion in the unit for air entangling and a mortar-like wall surface portion of a venturi to obtain a down ball-like mass in a desired form. 
     
     
         10 . The method for producing a down-like cotton material according to  claim 5 , wherein the float is selected from a light-weight hollow yarn, a type C cross-section yarn and a modified cross-section yarn whose surface area is larger than that of the circular cross-section yarn. 
     
     
         11 . The method for producing a down-like cotton material according to  claim 5 , wherein the unit for air entangling is connected an air supply source capable of adjusting the air pressure and the air volume for feeding compressed air for air entangling into an air receiving plug provided in the unit for air entangling via an air pipe comprising:
 a yarn and air supplier;   a unit inner cylindrical body made of metal;   a unit outer cylindrical body made of metal; and   a venturi held in the unit inner cylindrical body;   wherein an upper portion of the unit inner cylindrical body upward mounted is concentrically fastened and held to an upper portion in the unit outer cylindrical body, and a lower portion of the unit inner cylindrical body is downward protruded from a lower end surface central portion of the unit outer cylindrical body,   a lower end surface of the venturi held in an inner lower portion of the unit inner cylindrical body is downward protruded from a lower end surface central portion of the unit inner cylindrical body,   a tip nozzle portion downward protruded from a lower end center of a nozzle tube portion made of metal provided at a lower portion of the yarn and air supplier mounted in the unit inner cylindrical body from an upper portion of the unit outer cylindrical body faces the venture, and air flow is formed in a space between the tip nozzle portion and a mortar-like wall surface portion of the venturi,   the yarn and air supplier comprises a cylindrical nozzle tube portion and a tip nozzle portion downward protruded from a lower end center of the nozzle tube portion, and a circular handle portion is integrally attached to an upper end of the nozzle tube portion via a nozzle receiving cylindrical portion, a circular recessed portion for a circular upper portion of the unit outer cylindrical body to enter is provided on a bottom surface of the circular handle portion, a through hole from a central portion of an upper end of the nozzle tube portion to a lower end central portion of the nozzle tube portion is provided, a large-diameter tube portion comprising a positioning and securing mechanism is provided at the nozzle tube portion, and a portion from the lower portion of the large-diameter tube portion to a lower end thereof is provided as a small-diameter tube portion,   the upper portion of a through hole from a central portion of an upper end of the nozzle tube portion in the yarn and air supplier to a lower end central portion of the nozzle tube portion has a projection-circular portion, and a cylindrical inlet tube portion having an insertion hole is mounted therein and the axial fiber and the float are fed into an insertion hole of the inlet tube portion, an upper portion of the through hole is formed into a small-size tapered shape in a depth direction, a range from just beneath a portion of a tapered shape to a position equivalent to an end of the large-diameter tube portion is defined as a straight hole, and a taper hole whose diameter is reduced along a downward range from just beneath thereof to the vicinity of a lower end in the small-diameter tube portion is defined, a lower circular stepped portion is provided at a central portion of a lower end of the small-diameter tube portion, an upper end portion of the tip nozzle portion is concentrically mounted and fastened in a central position of the lower circular stepped portion, a nozzle taper hole is provided at the tip nozzle portion, the hole diameter of a lower-most end of the taper hole in the through hole and the hole diameter of an upper-most portion of the nozzle taper hole are set at the same to provide no step, and the axial fiber and the float are smoothly fed into the venturi from the through hole via the nozzle taper hole,   an air receiving concave portion positioned outside the taper hole capable of axially rotating is provided at a small-diameter tube portion of the nozzle tube portion in the yarn and air supplier, and a lower surface of the air receiving concave portion and the lower circular stepped portion are connected to provide two air holes for blowing air downward,   the unit inner cylindrical body provides a plan-view circular protruding tube portion which is laterally protruded at an upper portion thereof, an insertion tube portion whose diameter is smaller than that of a protruding tube portion is concentrically protruded downward from the protruding tube portion, a circular large-diameter tube portion receiving stepped portion into which a lower portion of the large-diameter tube portion of the yarn and air supplier is fitted is provided on an upper surface of the protruding tube portion of the unit inner cylindrical body, a unit inner cylindrical body through hole is provided from a central portion of the large-diameter tube portion receiving stepped portion to a lower end thereof via the inside of the insertion tube portion, a circular protruding portion whose internal diameter is smaller than the internal diameter of the unit inner cylindrical body through hole is provided at a lower end of the unit inner cylindrical body through hole of the unit inner cylindrical body to be inwardly protruded to the unit inner cylindrical body through hole to accept a lower end of the small-diameter tube portion of the yarn and air supplier, an O ring is attached to a side wall of the protruding tube portion of the unit inner cylindrical body, the O ring is closely spaced on an inner wall surface of the circular receiving hole portion when the protruding tube portion is mounted in a circular receiving hole portion of the unit outer cylindrical body, and an air through hole is provided at a side wall portion of the insertion tube portion in the unit inner cylindrical body, so that the air through hole comes to the position of a mounting receiving hole for the air receiving plug when the unit inner cylindrical body is mounted on the unit outer cylindrical body,   the unit outer cylindrical body is cylindrical, and a circular receiving hole portion at which the protruding tube portion of the unit inner cylindrical body is mounted is provided at an inner peripheral portion of the circular upper portion, and a through insertion hole whose diameter is smaller than that of the circular receiving hole portion to be through up to a lower end to penetrate the insertion tube portion of the unit inner cylindrical body is provided at a lower portion of the circular receiving hole portion, a mounting receiving hole for an air receiving plug which is connected to an air supply source via an air pipe is provided at a side wall portion of the unit outer cylindrical body, a circular recessed portion at which the circular receiving hole portion is opened is provided at an inner peripheral portion of a circular upper portion of the unit outer cylindrical body, and a flat C ring is mounted at the circular recessed portion,   the venturi held in the unit inner cylindrical body is overall cylindrical, a mortar-like wall surface portion whose diameter is reduced from an upper end surface on which the axial fiber and the float each enter in a downward direction is provided at an upper portion of the center inside thereof, a venturi through hole of a taper shape whose diameter is expanded toward a penetrated lower end is provided, so that the axial fiber and the float can pass from a deepest portion of the mortar-like wall surface portion to a lower end surface,   a tip nozzle portion of the yarn and air supplier is substantially overall cylindrical, and the nozzle taper hole which is through from an upper end surface to a lower end surface and whose diameter is reduced from an upper end surface to a lower end surface is provided,   a positioning and securing mechanism at the nozzle tube portion of the yarn and air supplier comprises the large-diameter tube portion of the yarn and air supplier and a retaining ring disposed on the unit inner cylindrical body in the unit outer cylindrical body, the retaining ring has a circular hole portion whose diameter is slightly larger than the external diameter of the large-diameter tube portion of the yarn and air supplier, and a small projection which functions as a semicircular or a trapezoidal positioning and abutting receiving portion which is inwardly protruded is provided at part of the circular hole portion,   a flat annular retaining ring is abutted against an upper end surface of the protruding tube portion of the unit inner cylindrical body while the unit inner cylindrical body is mounted to the unit outer cylindrical body, and the unit inner cylindrical body is held in the unit outer cylindrical body to be fastened by mounting an outer peripheral portion of the C ring disposed on the retaining ring at the circular recessed portion,   the yarn and air supplier is provided with a semicircular or a trapezoidal concave portion capable of being fitted into the large-diameter tube portion receiving stepped portion of the unit inner cylindrical body so that a lower portion of the large-diameter tube portion is not blocked by the small projection while the small projection is positioned to the large-diameter tube portion, and an inclined outer peripheral portion for forming an inclined groove from one end of the concave portion to a lower surface outer peripheral portion of the nozzle receiving cylindrical portion provided in a position at an angle of  180  degrees in a circumferential direction of the large-diameter tube portion, and the inclined outer peripheral portion is formed so that the wall thickness is small at the concave portion and the wall thickness becomes large as it is away from the concave portion, thereby making a lower surface of an inclined groove inclined, accordingly the unit inner cylindrical body is mounted on the unit outer cylindrical body to be fastened, and thereafter the yarn and air supplier are positioned to be mounted in the unit inner cylindrical body, subsequently by rotating the circular handle portion, a lower surface of the inclined groove of the positioning and securing mechanism is pressed against a lower surface of the small projection of the retaining ring, so that the yarn and air supplier can be secured and fastened to the unit outer cylindrical body, and the air receiving concave portion of the yarn and air supplier faces the air through hole of the unit inner cylindrical body,   the axial fiber and the float fed into the unit for air entangling via a step of feeding an axial fiber and a float in the yarn and air supplier pass through an inlet tube portion, a through hole and a tip nozzle portion of the yarn and air supplier to enter the mortar-like wall surface portion in the venturi, air fed into the air receiving plug reaches the air receiving concave portion in the unit for air entangling, and the air is fed into a space formed by the mortar-like wall surface portion via the air hole, and it is blown to an inclined surface of the mortar-like wall surface portion and dispersed, accordingly the float which enters the space formed by the mortar-like wall surface portion of the venturi is disturbed by air flow which is dispersed in the space, and filaments of the axial fiber and the float are united to be entangled, connected and integrated to form the down-like cotton material in a cotton-like form having a down ball-like mass in an aligned form, and   the size of the down ball-like mass of the down-like cotton material, the interval between down ball-like masses and the float density are changed in various ways by combining production factors such as the ratio of feeding the float to the axial fiber, the air volume and the air pressure from the air supply source in the unit for air entangling, the gap interval from an end of the tip nozzle portion of the yarn and air supplier to a deepest portion of the mortar-like wall surface portion of the venturi to produce the down-like cotton material.   
     
     
         12 . The down-like cotton material according to  claim 2 , wherein the float is selected from a light-weight hollow yarn, a type C cross-section yarn and a modified cross-section yarn whose surface area is larger than that of the circular cross-section yarn. 
     
     
         13 . The down-like cotton material according to  claim 3 , wherein the float is selected from a light-weight hollow yarn, a type C cross-section yarn and a modified cross-section yarn whose surface area is larger than that of the circular cross-section yarn. 
     
     
         14 . The method for producing a down-like cotton material according to  claim 8 , wherein the size of the down ball-like mass, the interval between down ball-like masses and the float density are changed in various ways by combining production factors such as the ratio of feeding the float to the axial fiber, the air volume and the air pressure for air entangling in the unit for air entangling, adjustment of the interval between a tip nozzle portion in the unit for air entangling and a mortar-like wall surface portion of a venturi to obtain a down ball-like mass in a desired form. 
     
     
         15 . The method for producing a down-like cotton material according to  claim 6 , wherein the float is selected from a light-weight hollow yarn, a type C cross-section yarn and a modified cross-section yarn whose surface area is larger than that of the circular cross-section yarn. 
     
     
         16 . The method for producing a down-like cotton material according to  claim 7 , wherein the float is selected from a light-weight hollow yarn, a type C cross-section yarn and a modified cross-section yarn whose surface area is larger than that of the circular cross-section yarn. 
     
     
         17 . The method for producing a down-like cotton material according to  claim 8 , wherein the float is selected from a light-weight hollow yarn, a type C cross-section yarn and a modified cross-section yarn whose surface area is larger than that of the circular cross-section yarn. 
     
     
         18 . The method for producing a down-like cotton material according to  claim 9 , wherein the float is selected from a light-weight hollow yarn, a type C cross-section yarn and a modified cross-section yarn whose surface area is larger than that of the circular cross-section yarn. 
     
     
         19 . The method for producing a down-like cotton material according to  claim 6 , wherein the unit for air entangling is connected an air supply source capable of adjusting the air pressure and the air volume for feeding compressed air for air entangling into an air receiving plug provided in the unit for air entangling via an air pipe comprising:
 a yarn and air supplier;   a unit inner cylindrical body made of metal;   a unit outer cylindrical body made of metal; and   a venturi held in the unit inner cylindrical body;   
       wherein an upper portion of the unit inner cylindrical body upward mounted is concentrically fastened and held to an upper portion in the unit outer cylindrical body, and a lower portion of the unit inner cylindrical body is downward protruded from a lower end surface central portion of the unit outer cylindrical body,
 a lower end surface of the venturi held in an inner lower portion of the unit inner cylindrical body is downward protruded from a lower end surface central portion of the unit inner cylindrical body, 
 a tip nozzle portion downward protruded from a lower end center of a nozzle tube portion made of metal provided at a lower portion of the yarn and air supplier mounted in the unit inner cylindrical body from an upper portion of the unit outer cylindrical body faces the venture, and air flow is formed in a space between the tip nozzle portion and a mortar-like wall surface portion of the venturi, 
 the yarn and air supplier comprises a cylindrical nozzle tube portion and a tip nozzle portion downward protruded from a lower end center of the nozzle tube portion, and a circular handle portion is integrally attached to an upper end of the nozzle tube portion via a nozzle receiving cylindrical portion, a circular recessed portion for a circular upper portion of the unit outer cylindrical body to enter is provided on a bottom surface of the circular handle portion, a through hole from a central portion of an upper end of the nozzle tube portion to a lower end central portion of the nozzle tube portion is provided, a large-diameter tube portion comprising a positioning and securing mechanism is provided at the nozzle tube portion, and a portion from the lower portion of the large-diameter tube portion to a lower end thereof is provided as a small-diameter tube portion, 
 the upper portion of a through hole from a central portion of an upper end of the nozzle tube portion in the yarn and air supplier to a lower end central portion of the nozzle tube portion has a projection-circular portion, and a cylindrical inlet tube portion having an insertion hole is mounted therein and the axial fiber and the float are fed into an insertion hole of the inlet tube portion, an upper portion of the through hole is formed into a small-size tapered shape in a depth direction, a range from just beneath a portion of a tapered shape to a position equivalent to an end of the large-diameter tube portion is defined as a straight hole, and a taper hole whose diameter is reduced along a downward range from just beneath thereof to the vicinity of a lower end in the small-diameter tube portion is defined, a lower circular stepped portion is provided at a central portion of a lower end of the small-diameter tube portion, an upper end portion of the tip nozzle portion is concentrically mounted and fastened in a central position of the lower circular stepped portion, a nozzle taper hole is provided at the tip nozzle portion, the hole diameter of a lower-most end of the taper hole in the through hole and the hole diameter of an upper-most portion of the nozzle taper hole are set at the same to provide no step, and the axial fiber and the float are smoothly fed into the venturi from the through hole via the nozzle taper hole, 
 an air receiving concave portion positioned outside the taper hole capable of axially rotating is provided at a small-diameter tube portion of the nozzle tube portion in the yarn and air supplier, and a lower surface of the air receiving concave portion and the lower circular stepped portion are connected to provide two air holes for blowing air downward, 
 the unit inner cylindrical body provides a plan-view circular protruding tube portion which is laterally protruded at an upper portion thereof, an insertion tube portion whose diameter is smaller than that of a protruding tube portion is concentrically protruded downward from the protruding tube portion, a circular large-diameter tube portion receiving stepped portion into which a lower portion of the large-diameter tube portion of the yarn and air supplier is fitted is provided on an upper surface of the protruding tube portion of the unit inner cylindrical body, a unit inner cylindrical body through hole is provided from a central portion of the large-diameter tube portion receiving stepped portion to a lower end thereof via the inside of the insertion tube portion, a circular protruding portion whose internal diameter is smaller than the internal diameter of the unit inner cylindrical body through hole is provided at a lower end of the unit inner cylindrical body through hole of the unit inner cylindrical body to be inwardly protruded to the unit inner cylindrical body through hole to accept a lower end of the small-diameter tube portion of the yarn and air supplier, an O ring is attached to a side wall of the protruding tube portion of the unit inner cylindrical body, the O ring is closely spaced on an inner wall surface of the circular receiving hole portion when the protruding tube portion is mounted in a circular receiving hole portion of the unit outer cylindrical body, and an air through hole is provided at a side wall portion of the insertion tube portion in the unit inner cylindrical body, so that the air through hole comes to the position of a mounting receiving hole for the air receiving plug when the unit inner cylindrical body is mounted on the unit outer cylindrical body, 
 the unit outer cylindrical body is cylindrical, and a circular receiving hole portion at which the protruding tube portion of the unit inner cylindrical body is mounted is provided at an inner peripheral portion of the circular upper portion, and a through insertion hole whose diameter is smaller than that of the circular receiving hole portion to be through up to a lower end to penetrate the insertion tube portion of the unit inner cylindrical body is provided at a lower portion of the circular receiving hole portion, a mounting receiving hole for an air receiving plug which is connected to an air supply source via an air pipe is provided at a side wall portion of the unit outer cylindrical body, a circular recessed portion at which the circular receiving hole portion is opened is provided at an inner peripheral portion of a circular upper portion of the unit outer cylindrical body, and a flat C ring is mounted at the circular recessed portion, 
 the venturi held in the unit inner cylindrical body is overall cylindrical, a mortar-like wall surface portion whose diameter is reduced from an upper end surface on which the axial fiber and the float each enter in a downward direction is provided at an upper portion of the center inside thereof, a venturi through hole of a taper shape whose diameter is expanded toward a penetrated lower end is provided, so that the axial fiber and the float can pass from a deepest portion of the mortar-like wall surface portion to a lower end surface, 
 a tip nozzle portion of the yarn and air supplier is substantially overall cylindrical, and the nozzle taper hole which is through from an upper end surface to a lower end surface and whose diameter is reduced from an upper end surface to a lower end surface is provided, 
 a positioning and securing mechanism at the nozzle tube portion of the yarn and air supplier comprises the large-diameter tube portion of the yarn and air supplier and a retaining ring disposed on the unit inner cylindrical body in the unit outer cylindrical body, the retaining ring has a circular hole portion whose diameter is slightly larger than the external diameter of the large-diameter tube portion of the yarn and air supplier, and a small projection which functions as a semicircular or a trapezoidal positioning and abutting receiving portion which is inwardly protruded is provided at part of the circular hole portion, 
 a flat annular retaining ring is abutted against an upper end surface of the protruding tube portion of the unit inner cylindrical body while the unit inner cylindrical body is mounted to the unit outer cylindrical body, and the unit inner cylindrical body is held in the unit outer cylindrical body to be fastened by mounting an outer peripheral portion of the C ring disposed on the retaining ring at the circular recessed portion, 
 the yarn and air supplier is provided with a semicircular or a trapezoidal concave portion capable of being fitted into the large-diameter tube portion receiving stepped portion of the unit inner cylindrical body so that a lower portion of the large-diameter tube portion is not blocked by the small projection while the small projection is positioned to the large-diameter tube portion, and an inclined outer peripheral portion for forming an inclined groove from one end of the concave portion to a lower surface outer peripheral portion of the nozzle receiving cylindrical portion provided in a position at an angle of 180 degrees in a circumferential direction of the large-diameter tube portion, and the inclined outer peripheral portion is formed so that the wall thickness is small at the concave portion and the wall thickness becomes large as it is away from the concave portion, thereby making a lower surface of an inclined groove inclined, accordingly the unit inner cylindrical body is mounted on the unit outer cylindrical body to be fastened, and thereafter the yarn and air supplier are positioned to be mounted in the unit inner cylindrical body, subsequently by rotating the circular handle portion, a lower surface of the inclined groove of the positioning and securing mechanism is pressed against a lower surface of the small projection of the retaining ring, so that the yarn and air supplier can be secured and fastened to the unit outer cylindrical body, and the air receiving concave portion of the yarn and air supplier faces the air through hole of the unit inner cylindrical body, 
 the axial fiber and the float fed into the unit for air entangling via a step of feeding an axial fiber and a float in the yarn and air supplier pass through an inlet tube portion, a through hole and a tip nozzle portion of the yarn and air supplier to enter the mortar-like wall surface portion in the venturi, air fed into the air receiving plug reaches the air receiving concave portion in the unit for air entangling, and the air is fed into a space formed by the mortar-like wall surface portion via the air hole, and it is blown to an inclined surface of the mortar-like wall surface portion and dispersed, accordingly the float which enters the space formed by the mortar-like wall surface portion of the venturi is disturbed by air flow which is dispersed in the space, and filaments of the axial fiber and the float are united to be entangled, connected and integrated to form the down-like cotton material in a cotton-like form having a down ball-like mass in an aligned form, and 
 the size of the down ball-like mass of the down-like cotton material, the interval between down ball-like masses and the float density are changed in various ways by combining production factors such as the ratio of feeding the float to the axial fiber, the air volume and the air pressure from the air supply source in the unit for air entangling, the gap interval from an end of the tip nozzle portion of the yarn and air supplier to a deepest portion of the mortar-like wall surface portion of the venturi to produce the down-like cotton material. 
 
     
     
         20 . The method for producing a down-like cotton material according to  claim 7 , wherein the unit for air entangling is connected an air supply source capable of adjusting the air pressure and the air volume for feeding compressed air for air entangling into an air receiving plug provided in the unit for air entangling via an air pipe comprising:
 a yarn and air supplier;   a unit inner cylindrical body made of metal;   a unit outer cylindrical body made of metal; and   a venturi held in the unit inner cylindrical body;   
       wherein an upper portion of the unit inner cylindrical body upward mounted is concentrically fastened and held to an upper portion in the unit outer cylindrical body, and a lower portion of the unit inner cylindrical body is downward protruded from a lower end surface central portion of the unit outer cylindrical body,
 a lower end surface of the venturi held in an inner lower portion of the unit inner cylindrical body is downward protruded from a lower end surface central portion of the unit inner cylindrical body, 
 a tip nozzle portion downward protruded from a lower end center of a nozzle tube portion made of metal provided at a lower portion of the yarn and air supplier mounted in the unit inner cylindrical body from an upper portion of the unit outer cylindrical body faces the venture, and air flow is formed in a space between the tip nozzle portion and a mortar-like wall surface portion of the venturi, 
 the yarn and air supplier comprises a cylindrical nozzle tube portion and a tip nozzle portion downward protruded from a lower end center of the nozzle tube portion, and a circular handle portion is integrally attached to an upper end of the nozzle tube portion via a nozzle receiving cylindrical portion, a circular recessed portion for a circular upper portion of the unit outer cylindrical body to enter is provided on a bottom surface of the circular handle portion, a through hole from a central portion of an upper end of the nozzle tube portion to a lower end central portion of the nozzle tube portion is provided, a large-diameter tube portion comprising a positioning and securing mechanism is provided at the nozzle tube portion, and a portion from the lower portion of the large-diameter tube portion to a lower end thereof is provided as a small-diameter tube portion, 
 the upper portion of a through hole from a central portion of an upper end of the nozzle tube portion in the yarn and air supplier to a lower end central portion of the nozzle tube portion has a projection-circular portion, and a cylindrical inlet tube portion having an insertion hole is mounted therein and the axial fiber and the float are fed into an insertion hole of the inlet tube portion, an upper portion of the through hole is formed into a small-size tapered shape in a depth direction, a range from just beneath a portion of a tapered shape to a position equivalent to an end of the large-diameter tube portion is defined as a straight hole, and a taper hole whose diameter is reduced along a downward range from just beneath thereof to the vicinity of a lower end in the small-diameter tube portion is defined, a lower circular stepped portion is provided at a central portion of a lower end of the small-diameter tube portion, an upper end portion of the tip nozzle portion is concentrically mounted and fastened in a central position of the lower circular stepped portion, a nozzle taper hole is provided at the tip nozzle portion, the hole diameter of a lower-most end of the taper hole in the through hole and the hole diameter of an upper-most portion of the nozzle taper hole are set at the same to provide no step, and the axial fiber and the float are smoothly fed into the venturi from the through hole via the nozzle taper hole, 
 an air receiving concave portion positioned outside the taper hole capable of axially rotating is provided at a small-diameter tube portion of the nozzle tube portion in the yarn and air supplier, and a lower surface of the air receiving concave portion and the lower circular stepped portion are connected to provide two air holes for blowing air downward, 
 the unit inner cylindrical body provides a plan-view circular protruding tube portion which is laterally protruded at an upper portion thereof, an insertion tube portion whose diameter is smaller than that of a protruding tube portion is concentrically protruded downward from the protruding tube portion, a circular large-diameter tube portion receiving stepped portion into which a lower portion of the large-diameter tube portion of the yarn and air supplier is fitted is provided on an upper surface of the protruding tube portion of the unit inner cylindrical body, a unit inner cylindrical body through hole is provided from a central portion of the large-diameter tube portion receiving stepped portion to a lower end thereof via the inside of the insertion tube portion, a circular protruding portion whose internal diameter is smaller than the internal diameter of the unit inner cylindrical body through hole is provided at a lower end of the unit inner cylindrical body through hole of the unit inner cylindrical body to be inwardly protruded to the unit inner cylindrical body through hole to accept a lower end of the small-diameter tube portion of the yarn and air supplier, an O ring is attached to a side wall of the protruding tube portion of the unit inner cylindrical body, the O ring is closely spaced on an inner wall surface of the circular receiving hole portion when the protruding tube portion is mounted in a circular receiving hole portion of the unit outer cylindrical body, and an air through hole is provided at a side wall portion of the insertion tube portion in the unit inner cylindrical body, so that the air through hole comes to the position of a mounting receiving hole for the air receiving plug when the unit inner cylindrical body is mounted on the unit outer cylindrical body, 
 the unit outer cylindrical body is cylindrical, and a circular receiving hole portion at which the protruding tube portion of the unit inner cylindrical body is mounted is provided at an inner peripheral portion of the circular upper portion, and a through insertion hole whose diameter is smaller than that of the circular receiving hole portion to be through up to a lower end to penetrate the insertion tube portion of the unit inner cylindrical body is provided at a lower portion of the circular receiving hole portion, a mounting receiving hole for an air receiving plug which is connected to an air supply source via an air pipe is provided at a side wall portion of the unit outer cylindrical body, a circular recessed portion at which the circular receiving hole portion is opened is provided at an inner peripheral portion of a circular upper portion of the unit outer cylindrical body, and a flat C ring is mounted at the circular recessed portion, 
 the venturi held in the unit inner cylindrical body is overall cylindrical, a mortar-like wall surface portion whose diameter is reduced from an upper end surface on which the axial fiber and the float each enter in a downward direction is provided at an upper portion of the center inside thereof, a venturi through hole of a taper shape whose diameter is expanded toward a penetrated lower end is provided, so that the axial fiber and the float can pass from a deepest portion of the mortar-like wall surface portion to a lower end surface, 
 a tip nozzle portion of the yarn and air supplier is substantially overall cylindrical, and the nozzle taper hole which is through from an upper end surface to a lower end surface and whose diameter is reduced from an upper end surface to a lower end surface is provided, 
 a positioning and securing mechanism at the nozzle tube portion of the yarn and air supplier comprises the large-diameter tube portion of the yarn and air supplier and a retaining ring disposed on the unit inner cylindrical body in the unit outer cylindrical body, the retaining ring has a circular hole portion whose diameter is slightly larger than the external diameter of the large-diameter tube portion of the yarn and air supplier, and a small projection which functions as a semicircular or a trapezoidal positioning and abutting receiving portion which is inwardly protruded is provided at part of the circular hole portion, 
 a flat annular retaining ring is abutted against an upper end surface of the protruding tube portion of the unit inner cylindrical body while the unit inner cylindrical body is mounted to the unit outer cylindrical body, and the unit inner cylindrical body is held in the unit outer cylindrical body to be fastened by mounting an outer peripheral portion of the C ring disposed on the retaining ring at the circular recessed portion, 
 the yarn and air supplier is provided with a semicircular or a trapezoidal concave portion capable of being fitted into the large-diameter tube portion receiving stepped portion of the unit inner cylindrical body so that a lower portion of the large-diameter tube portion is not blocked by the small projection while the small projection is positioned to the large-diameter tube portion, and an inclined outer peripheral portion for forming an inclined groove from one end of the concave portion to a lower surface outer peripheral portion of the nozzle receiving cylindrical portion provided in a position at an angle of  180  degrees in a circumferential direction of the large-diameter tube portion, and the inclined outer peripheral portion is formed so that the wall thickness is small at the concave portion and the wall thickness becomes large as it is away from the concave portion, thereby making a lower surface of an inclined groove inclined, accordingly the unit inner cylindrical body is mounted on the unit outer cylindrical body to be fastened, and thereafter the yarn and air supplier are positioned to be mounted in the unit inner cylindrical body, subsequently by rotating the circular handle portion, a lower surface of the inclined groove of the positioning and securing mechanism is pressed against a lower surface of the small projection of the retaining ring, so that the yarn and air supplier can be secured and fastened to the unit outer cylindrical body, and the air receiving concave portion of the yarn and air supplier faces the air through hole of the unit inner cylindrical body, 
 the axial fiber and the float fed into the unit for air entangling via a step of feeding an axial fiber and a float in the yarn and air supplier pass through an inlet tube portion, a through hole and a tip nozzle portion of the yarn and air supplier to enter the mortar-like wall surface portion in the venturi, air fed into the air receiving plug reaches the air receiving concave portion in the unit for air entangling, and the air is fed into a space formed by the mortar-like wall surface portion via the air hole, and it is blown to an inclined surface of the mortar-like wall surface portion and dispersed, accordingly the float which enters the space formed by the mortar-like wall surface portion of the venturi is disturbed by air flow which is dispersed in the space, and filaments of the axial fiber and the float are united to be entangled, connected and integrated to form the down-like cotton material in a cotton-like form having a down ball-like mass in an aligned form, and 
 the size of the down ball-like mass of the down-like cotton material, the interval between down ball-like masses and the float density are changed in various ways by combining production factors such as the ratio of feeding the float to the axial fiber, the air volume and the air pressure from the air supply source in the unit for air entangling, the gap interval from an end of the tip nozzle portion of the yarn and air supplier to a deepest portion of the mortar-like wall surface portion of the venturi to produce the down-like cotton material. 
 
     
     
         21 . The method for producing a down-like cotton material according to  claim 8 , wherein the unit for air entangling is connected an air supply source capable of adjusting the air pressure and the air volume for feeding compressed air for air entangling into an air receiving plug provided in the unit for air entangling via an air pipe comprising:
 a yarn and air supplier;   a unit inner cylindrical body made of metal;   a unit outer cylindrical body made of metal; and   a venturi held in the unit inner cylindrical body;   
       wherein an upper portion of the unit inner cylindrical body upward mounted is concentrically fastened and held to an upper portion in the unit outer cylindrical body, and a lower portion of the unit inner cylindrical body is downward protruded from a lower end surface central portion of the unit outer cylindrical body,
 a lower end surface of the venturi held in an inner lower portion of the unit inner cylindrical body is downward protruded from a lower end surface central portion of the unit inner cylindrical body, 
 a tip nozzle portion downward protruded from a lower end center of a nozzle tube portion made of metal provided at a lower portion of the yarn and air supplier mounted in the unit inner cylindrical body from an upper portion of the unit outer cylindrical body faces the venture, and air flow is formed in a space between the tip nozzle portion and a mortar-like wall surface portion of the venturi, 
 the yarn and air supplier comprises a cylindrical nozzle tube portion and a tip nozzle portion downward protruded from a lower end center of the nozzle tube portion, and a circular handle portion is integrally attached to an upper end of the nozzle tube portion via a nozzle receiving cylindrical portion, a circular recessed portion for a circular upper portion of the unit outer cylindrical body to enter is provided on a bottom surface of the circular handle portion, a through hole from a central portion of an upper end of the nozzle tube portion to a lower end central portion of the nozzle tube portion is provided, a large-diameter tube portion comprising a positioning and securing mechanism is provided at the nozzle tube portion, and a portion from the lower portion of the large-diameter tube portion to a lower end thereof is provided as a small-diameter tube portion, 
 the upper portion of a through hole from a central portion of an upper end of the nozzle tube portion in the yarn and air supplier to a lower end central portion of the nozzle tube portion has a projection-circular portion, and a cylindrical inlet tube portion having an insertion hole is mounted therein and the axial fiber and the float are fed into an insertion hole of the inlet tube portion, an upper portion of the through hole is formed into a small-size tapered shape in a depth direction, a range from just beneath a portion of a tapered shape to a position equivalent to an end of the large-diameter tube portion is defined as a straight hole, and a taper hole whose diameter is reduced along a downward range from just beneath thereof to the vicinity of a lower end in the small-diameter tube portion is defined, a lower circular stepped portion is provided at a central portion of a lower end of the small-diameter tube portion, an upper end portion of the tip nozzle portion is concentrically mounted and fastened in a central position of the lower circular stepped portion, a nozzle taper hole is provided at the tip nozzle portion, the hole diameter of a lower-most end of the taper hole in the through hole and the hole diameter of an upper-most portion of the nozzle taper hole are set at the same to provide no step, and the axial fiber and the float are smoothly fed into the venturi from the through hole via the nozzle taper hole, 
 an air receiving concave portion positioned outside the taper hole capable of axially rotating is provided at a small-diameter tube portion of the nozzle tube portion in the yarn and air supplier, and a lower surface of the air receiving concave portion and the lower circular stepped portion are connected to provide two air holes for blowing air downward, 
 the unit inner cylindrical body provides a plan-view circular protruding tube portion which is laterally protruded at an upper portion thereof, an insertion tube portion whose diameter is smaller than that of a protruding tube portion is concentrically protruded downward from the protruding tube portion, a circular large-diameter tube portion receiving stepped portion into which a lower portion of the large-diameter tube portion of the yarn and air supplier is fitted is provided on an upper surface of the protruding tube portion of the unit inner cylindrical body, a unit inner cylindrical body through hole is provided from a central portion of the large-diameter tube portion receiving stepped portion to a lower end thereof via the inside of the insertion tube portion, a circular protruding portion whose internal diameter is smaller than the internal diameter of the unit inner cylindrical body through hole is provided at a lower end of the unit inner cylindrical body through hole of the unit inner cylindrical body to be inwardly protruded to the unit inner cylindrical body through hole to accept a lower end of the small-diameter tube portion of the yarn and air supplier, an O ring is attached to a side wall of the protruding tube portion of the unit inner cylindrical body, the O ring is closely spaced on an inner wall surface of the circular receiving hole portion when the protruding tube portion is mounted in a circular receiving hole portion of the unit outer cylindrical body, and an air through hole is provided at a side wall portion of the insertion tube portion in the unit inner cylindrical body, so that the air through hole comes to the position of a mounting receiving hole for the air receiving plug when the unit inner cylindrical body is mounted on the unit outer cylindrical body, 
 the unit outer cylindrical body is cylindrical, and a circular receiving hole portion at which the protruding tube portion of the unit inner cylindrical body is mounted is provided at an inner peripheral portion of the circular upper portion, and a through insertion hole whose diameter is smaller than that of the circular receiving hole portion to be through up to a lower end to penetrate the insertion tube portion of the unit inner cylindrical body is provided at a lower portion of the circular receiving hole portion, a mounting receiving hole for an air receiving plug which is connected to an air supply source via an air pipe is provided at a side wall portion of the unit outer cylindrical body, a circular recessed portion at which the circular receiving hole portion is opened is provided at an inner peripheral portion of a circular upper portion of the unit outer cylindrical body, and a flat C ring is mounted at the circular recessed portion, 
 the venturi held in the unit inner cylindrical body is overall cylindrical, a mortar-like wall surface portion whose diameter is reduced from an upper end surface on which the axial fiber and the float each enter in a downward direction is provided at an upper portion of the center inside thereof, a venturi through hole of a taper shape whose diameter is expanded toward a penetrated lower end is provided, so that the axial fiber and the float can pass from a deepest portion of the mortar-like wall surface portion to a lower end surface, 
 a tip nozzle portion of the yarn and air supplier is substantially overall cylindrical, and the nozzle taper hole which is through from an upper end surface to a lower end surface and whose diameter is reduced from an upper end surface to a lower end surface is provided, 
 a positioning and securing mechanism at the nozzle tube portion of the yarn and air supplier comprises the large-diameter tube portion of the yarn and air supplier and a retaining ring disposed on the unit inner cylindrical body in the unit outer cylindrical body, the retaining ring has a circular hole portion whose diameter is slightly larger than the external diameter of the large-diameter tube portion of the yarn and air supplier, and a small projection which functions as a semicircular or a trapezoidal positioning and abutting receiving portion which is inwardly protruded is provided at part of the circular hole portion, 
 a flat annular retaining ring is abutted against an upper end surface of the protruding tube portion of the unit inner cylindrical body while the unit inner cylindrical body is mounted to the unit outer cylindrical body, and the unit inner cylindrical body is held in the unit outer cylindrical body to be fastened by mounting an outer peripheral portion of the C ring disposed on the retaining ring at the circular recessed portion, 
 the yarn and air supplier is provided with a semicircular or a trapezoidal concave portion capable of being fitted into the large-diameter tube portion receiving stepped portion of the unit inner cylindrical body so that a lower portion of the large-diameter tube portion is not blocked by the small projection while the small projection is positioned to the large-diameter tube portion, and an inclined outer peripheral portion for forming an inclined groove from one end of the concave portion to a lower surface outer peripheral portion of the nozzle receiving cylindrical portion provided in a position at an angle of  180  degrees in a circumferential direction of the large-diameter tube portion, and the inclined outer peripheral portion is formed so that the wall thickness is small at the concave portion and the wall thickness becomes large as it is away from the concave portion, thereby making a lower surface of an inclined groove inclined, accordingly the unit inner cylindrical body is mounted on the unit outer cylindrical body to be fastened, and thereafter the yarn and air supplier are positioned to be mounted in the unit inner cylindrical body, subsequently by rotating the circular handle portion, a lower surface of the inclined groove of the positioning and securing mechanism is pressed against a lower surface of the small projection of the retaining ring, so that the yarn and air supplier can be secured and fastened to the unit outer cylindrical body, and the air receiving concave portion of the yarn and air supplier faces the air through hole of the unit inner cylindrical body, 
 the axial fiber and the float fed into the unit for air entangling via a step of feeding an axial fiber and a float in the yarn and air supplier pass through an inlet tube portion, a through hole and a tip nozzle portion of the yarn and air supplier to enter the mortar-like wall surface portion in the venturi, air fed into the air receiving plug reaches the air receiving concave portion in the unit for air entangling, and the air is fed into a space formed by the mortar-like wall surface portion via the air hole, and it is blown to an inclined surface of the mortar-like wall surface portion and dispersed, accordingly the float which enters the space formed by the mortar-like wall surface portion of the venturi is disturbed by air flow which is dispersed in the space, and filaments of the axial fiber and the float are united to be entangled, connected and integrated to form the down-like cotton material in a cotton-like form having a down ball-like mass in an aligned form, and 
 the size of the down ball-like mass of the down-like cotton material, the interval between down ball-like masses and the float density are changed in various ways by combining production factors such as the ratio of feeding the float to the axial fiber, the air volume and the air pressure from the air supply source in the unit for air entangling, the gap interval from an end of the tip nozzle portion of the yarn and air supplier to a deepest portion of the mortar-like wall surface portion of the venturi to produce the down-like cotton material. 
 
     
     
         22 . The method for producing a down-like cotton material according to  claim 9 , wherein the unit for air entangling is connected an air supply source capable of adjusting the air pressure and the air volume for feeding compressed air for air entangling into an air receiving plug provided in the unit for air entangling via an air pipe comprising:
 a yarn and air supplier;   a unit inner cylindrical body made of metal;   a unit outer cylindrical body made of metal; and   a venturi held in the unit inner cylindrical body;   
       wherein an upper portion of the unit inner cylindrical body upward mounted is concentrically fastened and held to an upper portion in the unit outer cylindrical body, and a lower portion of the unit inner cylindrical body is downward protruded from a lower end surface central portion of the unit outer cylindrical body,
 a lower end surface of the venturi held in an inner lower portion of the unit inner cylindrical body is downward protruded from a lower end surface central portion of the unit inner cylindrical body, 
 a tip nozzle portion downward protruded from a lower end center of a nozzle tube portion made of metal provided at a lower portion of the yarn and air supplier mounted in the unit inner cylindrical body from an upper portion of the unit outer cylindrical body faces the venture, and air flow is formed in a space between the tip nozzle portion and a mortar-like wall surface portion of the venturi, 
 the yarn and air supplier comprises a cylindrical nozzle tube portion and a tip nozzle portion downward protruded from a lower end center of the nozzle tube portion, and a circular handle portion is integrally attached to an upper end of the nozzle tube portion via a nozzle receiving cylindrical portion, a circular recessed portion for a circular upper portion of the unit outer cylindrical body to enter is provided on a bottom surface of the circular handle portion, a through hole from a central portion of an upper end of the nozzle tube portion to a lower end central portion of the nozzle tube portion is provided, a large-diameter tube portion comprising a positioning and securing mechanism is provided at the nozzle tube portion, and a portion from the lower portion of the large-diameter tube portion to a lower end thereof is provided as a small-diameter tube portion, 
 the upper portion of a through hole from a central portion of an upper end of the nozzle tube portion in the yarn and air supplier to a lower end central portion of the nozzle tube portion has a projection-circular portion, and a cylindrical inlet tube portion having an insertion hole is mounted therein and the axial fiber and the float are fed into an insertion hole of the inlet tube portion, an upper portion of the through hole is formed into a small-size tapered shape in a depth direction, a range from just beneath a portion of a tapered shape to a position equivalent to an end of the large-diameter tube portion is defined as a straight hole, and a taper hole whose diameter is reduced along a downward range from just beneath thereof to the vicinity of a lower end in the small-diameter tube portion is defined, a lower circular stepped portion is provided at a central portion of a lower end of the small-diameter tube portion, an upper end portion of the tip nozzle portion is concentrically mounted and fastened in a central position of the lower circular stepped portion, a nozzle taper hole is provided at the tip nozzle portion, the hole diameter of a lower-most end of the taper hole in the through hole and the hole diameter of an upper-most portion of the nozzle taper hole are set at the same to provide no step, and the axial fiber and the float are smoothly fed into the venturi from the through hole via the nozzle taper hole, 
 an air receiving concave portion positioned outside the taper hole capable of axially rotating is provided at a small-diameter tube portion of the nozzle tube portion in the yarn and air supplier, and a lower surface of the air receiving concave portion and the lower circular stepped portion are connected to provide two air holes for blowing air downward, 
 the unit inner cylindrical body provides a plan-view circular protruding tube portion which is laterally protruded at an upper portion thereof, an insertion tube portion whose diameter is smaller than that of a protruding tube portion is concentrically protruded downward from the protruding tube portion, a circular large-diameter tube portion receiving stepped portion into which a lower portion of the large-diameter tube portion of the yarn and air supplier is fitted is provided on an upper surface of the protruding tube portion of the unit inner cylindrical body, a unit inner cylindrical body through hole is provided from a central portion of the large-diameter tube portion receiving stepped portion to a lower end thereof via the inside of the insertion tube portion, a circular protruding portion whose internal diameter is smaller than the internal diameter of the unit inner cylindrical body through hole is provided at a lower end of the unit inner cylindrical body through hole of the unit inner cylindrical body to be inwardly protruded to the unit inner cylindrical body through hole to accept a lower end of the small-diameter tube portion of the yarn and air supplier, an O ring is attached to a side wall of the protruding tube portion of the unit inner cylindrical body, the O ring is closely spaced on an inner wall surface of the circular receiving hole portion when the protruding tube portion is mounted in a circular receiving hole portion of the unit outer cylindrical body, and an air through hole is provided at a side wall portion of the insertion tube portion in the unit inner cylindrical body, so that the air through hole comes to the position of a mounting receiving hole for the air receiving plug when the unit inner cylindrical body is mounted on the unit outer cylindrical body, 
 the unit outer cylindrical body is cylindrical, and a circular receiving hole portion at which the protruding tube portion of the unit inner cylindrical body is mounted is provided at an inner peripheral portion of the circular upper portion, and a through insertion hole whose diameter is smaller than that of the circular receiving hole portion to be through up to a lower end to penetrate the insertion tube portion of the unit inner cylindrical body is provided at a lower portion of the circular receiving hole portion, a mounting receiving hole for an air receiving plug which is connected to an air supply source via an air pipe is provided at a side wall portion of the unit outer cylindrical body, a circular recessed portion at which the circular receiving hole portion is opened is provided at an inner peripheral portion of a circular upper portion of the unit outer cylindrical body, and a flat C ring is mounted at the circular recessed portion, 
 the venturi held in the unit inner cylindrical body is overall cylindrical, a mortar-like wall surface portion whose diameter is reduced from an upper end surface on which the axial fiber and the float each enter in a downward direction is provided at an upper portion of the center inside thereof, a venturi through hole of a taper shape whose diameter is expanded toward a penetrated lower end is provided, so that the axial fiber and the float can pass from a deepest portion of the mortar-like wall surface portion to a lower end surface, 
 a tip nozzle portion of the yarn and air supplier is substantially overall cylindrical, and the nozzle taper hole which is through from an upper end surface to a lower end surface and whose diameter is reduced from an upper end surface to a lower end surface is provided, 
 a positioning and securing mechanism at the nozzle tube portion of the yarn and air supplier comprises the large-diameter tube portion of the yarn and air supplier and a retaining ring disposed on the unit inner cylindrical body in the unit outer cylindrical body, the retaining ring has a circular hole portion whose diameter is slightly larger than the external diameter of the large-diameter tube portion of the yarn and air supplier, and a small projection which functions as a semicircular or a trapezoidal positioning and abutting receiving portion which is inwardly protruded is provided at part of the circular hole portion, 
 a flat annular retaining ring is abutted against an upper end surface of the protruding tube portion of the unit inner cylindrical body while the unit inner cylindrical body is mounted to the unit outer cylindrical body, and the unit inner cylindrical body is held in the unit outer cylindrical body to be fastened by mounting an outer peripheral portion of the C ring disposed on the retaining ring at the circular recessed portion, 
 the yarn and air supplier is provided with a semicircular or a trapezoidal concave portion capable of being fitted into the large-diameter tube portion receiving stepped portion of the unit inner cylindrical body so that a lower portion of the large-diameter tube portion is not blocked by the small projection while the small projection is positioned to the large-diameter tube portion, and an inclined outer peripheral portion for forming an inclined groove from one end of the concave portion to a lower surface outer peripheral portion of the nozzle receiving cylindrical portion provided in a position at an angle of  180  degrees in a circumferential direction of the large-diameter tube portion, and the inclined outer peripheral portion is formed so that the wall thickness is small at the concave portion and the wall thickness becomes large as it is away from the concave portion, thereby making a lower surface of an inclined groove inclined, accordingly the unit inner cylindrical body is mounted on the unit outer cylindrical body to be fastened, and thereafter the yarn and air supplier are positioned to be mounted in the unit inner cylindrical body, subsequently by rotating the circular handle portion, a lower surface of the inclined groove of the positioning and securing mechanism is pressed against a lower surface of the small projection of the retaining ring, so that the yarn and air supplier can be secured and fastened to the unit outer cylindrical body, and the air receiving concave portion of the yarn and air supplier faces the air through hole of the unit inner cylindrical body, 
 the axial fiber and the float fed into the unit for air entangling via a step of feeding an axial fiber and a float in the yarn and air supplier pass through an inlet tube portion, a through hole and a tip nozzle portion of the yarn and air supplier to enter the mortar-like wall surface portion in the venturi, air fed into the air receiving plug reaches the air receiving concave portion in the unit for air entangling, and the air is fed into a space formed by the mortar-like wall surface portion via the air hole, and it is blown to an inclined surface of the mortar-like wall surface portion and dispersed, accordingly the float which enters the space formed by the mortar-like wall surface portion of the venturi is disturbed by air flow which is dispersed in the space, and filaments of the axial fiber and the float are united to be entangled, connected and integrated to form the down-like cotton material in a cotton-like form having a down ball-like mass in an aligned form, and 
 the size of the down ball-like mass of the down-like cotton material, the interval between down ball-like masses and the float density are changed in various ways by combining production factors such as the ratio of feeding the float to the axial fiber, the air volume and the air pressure from the air supply source in the unit for air entangling, the gap interval from an end of the tip nozzle portion of the yarn and air supplier to a deepest portion of the mortar-like wall surface portion of the venturi to produce the down-like cotton material. 
 
     
     
         23 . The method for producing a down-like cotton material according to  claim 10 , wherein the unit for air entangling is connected an air supply source capable of adjusting the air pressure and the air volume for feeding compressed air for air entangling into an air receiving plug provided in the unit for air entangling via an air pipe comprising:
 a yarn and air supplier;   a unit inner cylindrical body made of metal;   a unit outer cylindrical body made of metal; and   a venturi held in the unit inner cylindrical body;   
       wherein an upper portion of the unit inner cylindrical body upward mounted is concentrically fastened and held to an upper portion in the unit outer cylindrical body, and a lower portion of the unit inner cylindrical body is downward protruded from a lower end surface central portion of the unit outer cylindrical body,
 a lower end surface of the venturi held in an inner lower portion of the unit inner cylindrical body is downward protruded from a lower end surface central portion of the unit inner cylindrical body, 
 a tip nozzle portion downward protruded from a lower end center of a nozzle tube portion made of metal provided at a lower portion of the yarn and air supplier mounted in the unit inner cylindrical body from an upper portion of the unit outer cylindrical body faces the venture, and air flow is formed in a space between the tip nozzle portion and a mortar-like wall surface portion of the venturi, 
 the yarn and air supplier comprises a cylindrical nozzle tube portion and a tip nozzle portion downward protruded from a lower end center of the nozzle tube portion, and a circular handle portion is integrally attached to an upper end of the nozzle tube portion via a nozzle receiving cylindrical portion, a circular recessed portion for a circular upper portion of the unit outer cylindrical body to enter is provided on a bottom surface of the circular handle portion, a through hole from a central portion of an upper end of the nozzle tube portion to a lower end central portion of the nozzle tube portion is provided, a large-diameter tube portion comprising a positioning and securing mechanism is provided at the nozzle tube portion, and a portion from the lower portion of the large-diameter tube portion to a lower end thereof is provided as a small-diameter tube portion, 
 the upper portion of a through hole from a central portion of an upper end of the nozzle tube portion in the yarn and air supplier to a lower end central portion of the nozzle tube portion has a projection-circular portion, and a cylindrical inlet tube portion having an insertion hole is mounted therein and the axial fiber and the float are fed into an insertion hole of the inlet tube portion, an upper portion of the through hole is formed into a small-size tapered shape in a depth direction, a range from just beneath a portion of a tapered shape to a position equivalent to an end of the large-diameter tube portion is defined as a straight hole, and a taper hole whose diameter is reduced along a downward range from just beneath thereof to the vicinity of a lower end in the small-diameter tube portion is defined, a lower circular stepped portion is provided at a central portion of a lower end of the small-diameter tube portion, an upper end portion of the tip nozzle portion is concentrically mounted and fastened in a central position of the lower circular stepped portion, a nozzle taper hole is provided at the tip nozzle portion, the hole diameter of a lower-most end of the taper hole in the through hole and the hole diameter of an upper-most portion of the nozzle taper hole are set at the same to provide no step, and the axial fiber and the float are smoothly fed into the venturi from the through hole via the nozzle taper hole, 
 an air receiving concave portion positioned outside the taper hole capable of axially rotating is provided at a small-diameter tube portion of the nozzle tube portion in the yarn and air supplier, and a lower surface of the air receiving concave portion and the lower circular stepped portion are connected to provide two air holes for blowing air downward, 
 the unit inner cylindrical body provides a plan-view circular protruding tube portion which is laterally protruded at an upper portion thereof, an insertion tube portion whose diameter is smaller than that of a protruding tube portion is concentrically protruded downward from the protruding tube portion, a circular large-diameter tube portion receiving stepped portion into which a lower portion of the large-diameter tube portion of the yarn and air supplier is fitted is provided on an upper surface of the protruding tube portion of the unit inner cylindrical body, a unit inner cylindrical body through hole is provided from a central portion of the large-diameter tube portion receiving stepped portion to a lower end thereof via the inside of the insertion tube portion, a circular protruding portion whose internal diameter is smaller than the internal diameter of the unit inner cylindrical body through hole is provided at a lower end of the unit inner cylindrical body through hole of the unit inner cylindrical body to be inwardly protruded to the unit inner cylindrical body through hole to accept a lower end of the small-diameter tube portion of the yarn and air supplier, an O ring is attached to a side wall of the protruding tube portion of the unit inner cylindrical body, the O ring is closely spaced on an inner wall surface of the circular receiving hole portion when the protruding tube portion is mounted in a circular receiving hole portion of the unit outer cylindrical body, and an air through hole is provided at a side wall portion of the insertion tube portion in the unit inner cylindrical body, so that the air through hole comes to the position of a mounting receiving hole for the air receiving plug when the unit inner cylindrical body is mounted on the unit outer cylindrical body, 
 the unit outer cylindrical body is cylindrical, and a circular receiving hole portion at which the protruding tube portion of the unit inner cylindrical body is mounted is provided at an inner peripheral portion of the circular upper portion, and a through insertion hole whose diameter is smaller than that of the circular receiving hole portion to be through up to a lower end to penetrate the insertion tube portion of the unit inner cylindrical body is provided at a lower portion of the circular receiving hole portion, a mounting receiving hole for an air receiving plug which is connected to an air supply source via an air pipe is provided at a side wall portion of the unit outer cylindrical body, a circular recessed portion at which the circular receiving hole portion is opened is provided at an inner peripheral portion of a circular upper portion of the unit outer cylindrical body, and a flat C ring is mounted at the circular recessed portion, 
 the venturi held in the unit inner cylindrical body is overall cylindrical, a mortar-like wall surface portion whose diameter is reduced from an upper end surface on which the axial fiber and the float each enter in a downward direction is provided at an upper portion of the center inside thereof, a venturi through hole of a taper shape whose diameter is expanded toward a penetrated lower end is provided, so that the axial fiber and the float can pass from a deepest portion of the mortar-like wall surface portion to a lower end surface, 
 a tip nozzle portion of the yarn and air supplier is substantially overall cylindrical, and the nozzle taper hole which is through from an upper end surface to a lower end surface and whose diameter is reduced from an upper end surface to a lower end surface is provided, 
 a positioning and securing mechanism at the nozzle tube portion of the yarn and air supplier comprises the large-diameter tube portion of the yarn and air supplier and a retaining ring disposed on the unit inner cylindrical body in the unit outer cylindrical body, the retaining ring has a circular hole portion whose diameter is slightly larger than the external diameter of the large-diameter tube portion of the yarn and air supplier, and a small projection which functions as a semicircular or a trapezoidal positioning and abutting receiving portion which is inwardly protruded is provided at part of the circular hole portion, 
 a flat annular retaining ring is abutted against an upper end surface of the protruding tube portion of the unit inner cylindrical body while the unit inner cylindrical body is mounted to the unit outer cylindrical body, and the unit inner cylindrical body is held in the unit outer cylindrical body to be fastened by mounting an outer peripheral portion of the C ring disposed on the retaining ring at the circular recessed portion, 
 the yarn and air supplier is provided with a semicircular or a trapezoidal concave portion capable of being fitted into the large-diameter tube portion receiving stepped portion of the unit inner cylindrical body so that a lower portion of the large-diameter tube portion is not blocked by the small projection while the small projection is positioned to the large-diameter tube portion, and an inclined outer peripheral portion for forming an inclined groove from one end of the concave portion to a lower surface outer peripheral portion of the nozzle receiving cylindrical portion provided in a position at an angle of  180  degrees in a circumferential direction of the large-diameter tube portion, and the inclined outer peripheral portion is formed so that the wall thickness is small at the concave portion and the wall thickness becomes large as it is away from the concave portion, thereby making a lower surface of an inclined groove inclined, accordingly the unit inner cylindrical body is mounted on the unit outer cylindrical body to be fastened, and thereafter the yarn and air supplier are positioned to be mounted in the unit inner cylindrical body, subsequently by rotating the circular handle portion, a lower surface of the inclined groove of the positioning and securing mechanism is pressed against a lower surface of the small projection of the retaining ring, so that the yarn and air supplier can be secured and fastened to the unit outer cylindrical body, and the air receiving concave portion of the yarn and air supplier faces the air through hole of the unit inner cylindrical body, 
 the axial fiber and the float fed into the unit for air entangling via a step of feeding an axial fiber and a float in the yarn and air supplier pass through an inlet tube portion, a through hole and a tip nozzle portion of the yarn and air supplier to enter the mortar-like wall surface portion in the venturi, air fed into the air receiving plug reaches the air receiving concave portion in the unit for air entangling, and the air is fed into a space formed by the mortar-like wall surface portion via the air hole, and it is blown to an inclined surface of the mortar-like wall surface portion and dispersed, accordingly the float which enters the space formed by the mortar-like wall surface portion of the venturi is disturbed by air flow which is dispersed in the space, and filaments of the axial fiber and the float are united to be entangled, connected and integrated to form the down-like cotton material in a cotton-like form having a down ball-like mass in an aligned form, and 
 the size of the down ball-like mass of the down-like cotton material, the interval between down ball-like masses and the float density are changed in various ways by combining production factors such as the ratio of feeding the float to the axial fiber, the air volume and the air pressure from the air supply source in the unit for air entangling, the gap interval from an end of the tip nozzle portion of the yarn and air supplier to a deepest portion of the mortar-like wall surface portion of the venturi to produce the down-like cotton material. 
 
     
     
         24 . The method for producing a down-like cotton material according to  claim 14 , wherein the float is selected from a light-weight hollow yarn, a type C cross-section yarn and a modified cross-section yarn whose surface area is larger than that of the circular cross-section yarn. 
     
     
         25 . The method for producing a down-like cotton material according to  claim 14 , wherein the unit for air entangling is connected an air supply source capable of adjusting the air pressure and the air volume for feeding compressed air for air entangling into an air receiving plug provided in the unit for air entangling via an air pipe comprising:
 a yarn and air supplier;   a unit inner cylindrical body made of metal;   a unit outer cylindrical body made of metal; and   a venturi held in the unit inner cylindrical body;   
       wherein an upper portion of the unit inner cylindrical body upward mounted is concentrically fastened and held to an upper portion in the unit outer cylindrical body, and a lower portion of the unit inner cylindrical body is downward protruded from a lower end surface central portion of the unit outer cylindrical body,
 a lower end surface of the venturi held in an inner lower portion of the unit inner cylindrical body is downward protruded from a lower end surface central portion of the unit inner cylindrical body, 
 a tip nozzle portion downward protruded from a lower end center of a nozzle tube portion made of metal provided at a lower portion of the yarn and air supplier mounted in the unit inner cylindrical body from an upper portion of the unit outer cylindrical body faces the venture, and air flow is formed in a space between the tip nozzle portion and a mortar-like wall surface portion of the venturi, 
 the yarn and air supplier comprises a cylindrical nozzle tube portion and a tip nozzle portion downward protruded from a lower end center of the nozzle tube portion, and a circular handle portion is integrally attached to an upper end of the nozzle tube portion via a nozzle receiving cylindrical portion, a circular recessed portion for a circular upper portion of the unit outer cylindrical body to enter is provided on a bottom surface of the circular handle portion, a through hole from a central portion of an upper end of the nozzle tube portion to a lower end central portion of the nozzle tube portion is provided, a large-diameter tube portion comprising a positioning and securing mechanism is provided at the nozzle tube portion, and a portion from the lower portion of the large-diameter tube portion to a lower end thereof is provided as a small-diameter tube portion, 
 the upper portion of a through hole from a central portion of an upper end of the nozzle tube portion in the yarn and air supplier to a lower end central portion of the nozzle tube portion has a projection-circular portion, and a cylindrical inlet tube portion having an insertion hole is mounted therein and the axial fiber and the float are fed into an insertion hole of the inlet tube portion, an upper portion of the through hole is formed into a small-size tapered shape in a depth direction, a range from just beneath a portion of a tapered shape to a position equivalent to an end of the large-diameter tube portion is defined as a straight hole, and a taper hole whose diameter is reduced along a downward range from just beneath thereof to the vicinity of a lower end in the small-diameter tube portion is defined, a lower circular stepped portion is provided at a central portion of a lower end of the small-diameter tube portion, an upper end portion of the tip nozzle portion is concentrically mounted and fastened in a central position of the lower circular stepped portion, a nozzle taper hole is provided at the tip nozzle portion, the hole diameter of a lower-most end of the taper hole in the through hole and the hole diameter of an upper-most portion of the nozzle taper hole are set at the same to provide no step, and the axial fiber and the float are smoothly fed into the venturi from the through hole via the nozzle taper hole, 
 an air receiving concave portion positioned outside the taper hole capable of axially rotating is provided at a small-diameter tube portion of the nozzle tube portion in the yarn and air supplier, and a lower surface of the air receiving concave portion and the lower circular stepped portion are connected to provide two air holes for blowing air downward, 
 the unit inner cylindrical body provides a plan-view circular protruding tube portion which is laterally protruded at an upper portion thereof, an insertion tube portion whose diameter is smaller than that of a protruding tube portion is concentrically protruded downward from the protruding tube portion, a circular large-diameter tube portion receiving stepped portion into which a lower portion of the large-diameter tube portion of the yarn and air supplier is fitted is provided on an upper surface of the protruding tube portion of the unit inner cylindrical body, a unit inner cylindrical body through hole is provided from a central portion of the large-diameter tube portion receiving stepped portion to a lower end thereof via the inside of the insertion tube portion, a circular protruding portion whose internal diameter is smaller than the internal diameter of the unit inner cylindrical body through hole is provided at a lower end of the unit inner cylindrical body through hole of the unit inner cylindrical body to be inwardly protruded to the unit inner cylindrical body through hole to accept a lower end of the small-diameter tube portion of the yarn and air supplier, an O ring is attached to a side wall of the protruding tube portion of the unit inner cylindrical body, the O ring is closely spaced on an inner wall surface of the circular receiving hole portion when the protruding tube portion is mounted in a circular receiving hole portion of the unit outer cylindrical body, and an air through hole is provided at a side wall portion of the insertion tube portion in the unit inner cylindrical body, so that the air through hole comes to the position of a mounting receiving hole for the air receiving plug when the unit inner cylindrical body is mounted on the unit outer cylindrical body, 
 the unit outer cylindrical body is cylindrical, and a circular receiving hole portion at which the protruding tube portion of the unit inner cylindrical body is mounted is provided at an inner peripheral portion of the circular upper portion, and a through insertion hole whose diameter is smaller than that of the circular receiving hole portion to be through up to a lower end to penetrate the insertion tube portion of the unit inner cylindrical body is provided at a lower portion of the circular receiving hole portion, a mounting receiving hole for an air receiving plug which is connected to an air supply source via an air pipe is provided at a side wall portion of the unit outer cylindrical body, a circular recessed portion at which the circular receiving hole portion is opened is provided at an inner peripheral portion of a circular upper portion of the unit outer cylindrical body, and a flat C ring is mounted at the circular recessed portion, 
 the venturi held in the unit inner cylindrical body is overall cylindrical, a mortar-like wall surface portion whose diameter is reduced from an upper end surface on which the axial fiber and the float each enter in a downward direction is provided at an upper portion of the center inside thereof, a venturi through hole of a taper shape whose diameter is expanded toward a penetrated lower end is provided, so that the axial fiber and the float can pass from a deepest portion of the mortar-like wall surface portion to a lower end surface, 
 a tip nozzle portion of the yarn and air supplier is substantially overall cylindrical, and the nozzle taper hole which is through from an upper end surface to a lower end surface and whose diameter is reduced from an upper end surface to a lower end surface is provided, 
 a positioning and securing mechanism at the nozzle tube portion of the yarn and air supplier comprises the large-diameter tube portion of the yarn and air supplier and a retaining ring disposed on the unit inner cylindrical body in the unit outer cylindrical body, the retaining ring has a circular hole portion whose diameter is slightly larger than the external diameter of the large-diameter tube portion of the yarn and air supplier, and a small projection which functions as a semicircular or a trapezoidal positioning and abutting receiving portion which is inwardly protruded is provided at part of the circular hole portion, 
 a flat annular retaining ring is abutted against an upper end surface of the protruding tube portion of the unit inner cylindrical body while the unit inner cylindrical body is mounted to the unit outer cylindrical body, and the unit inner cylindrical body is held in the unit outer cylindrical body to be fastened by mounting an outer peripheral portion of the C ring disposed on the retaining ring at the circular recessed portion, 
 the yarn and air supplier is provided with a semicircular or a trapezoidal concave portion capable of being fitted into the large-diameter tube portion receiving stepped portion of the unit inner cylindrical body so that a lower portion of the large-diameter tube portion is not blocked by the small projection while the small projection is positioned to the large-diameter tube portion, and an inclined outer peripheral portion for forming an inclined groove from one end of the concave portion to a lower surface outer peripheral portion of the nozzle receiving cylindrical portion provided in a position at an angle of 180 degrees in a circumferential direction of the large-diameter tube portion, and the inclined outer peripheral portion is formed so that the wall thickness is small at the concave portion and the wall thickness becomes large as it is away from the concave portion, thereby making a lower surface of an inclined groove inclined, accordingly the unit inner cylindrical body is mounted on the unit outer cylindrical body to be fastened, and thereafter the yarn and air supplier are positioned to be mounted in the unit inner cylindrical body, subsequently by rotating the circular handle portion, a lower surface of the inclined groove of the positioning and securing mechanism is pressed against a lower surface of the small projection of the retaining ring, so that the yarn and air supplier can be secured and fastened to the unit outer cylindrical body, and the air receiving concave portion of the yarn and air supplier faces the air through hole of the unit inner cylindrical body, 
 the axial fiber and the float fed into the unit for air entangling via a step of feeding an axial fiber and a float in the yarn and air supplier pass through an inlet tube portion, a through hole and a tip nozzle portion of the yarn and air supplier to enter the mortar-like wall surface portion in the venturi, air fed into the air receiving plug reaches the air receiving concave portion in the unit for air entangling, and the air is fed into a space formed by the mortar-like wall surface portion via the air hole, and it is blown to an inclined surface of the mortar-like wall surface portion and dispersed, accordingly the float which enters the space formed by the mortar-like wall surface portion of the venturi is disturbed by air flow which is dispersed in the space, and filaments of the axial fiber and the float are united to be entangled, connected and integrated to form the down-like cotton material in a cotton-like form having a down ball-like mass in an aligned form, and 
 the size of the down ball-like mass of the down-like cotton material, the interval between down ball-like masses and the float density are changed in various ways by combining production factors such as the ratio of feeding the float to the axial fiber, the air volume and the air pressure from the air supply source in the unit for air entangling, the gap interval from an end of the tip nozzle portion of the yarn and air supplier to a deepest portion of the mortar-like wall surface portion of the venturi to produce the down-like cotton material. 
 
     
     
         26 . The method for producing a down-like cotton material according to  claim 15 , wherein the unit for air entangling is connected an air supply source capable of adjusting the air pressure and the air volume for feeding compressed air for air entangling into an air receiving plug provided in the unit for air entangling via an air pipe comprising:
 a yarn and air supplier;   a unit inner cylindrical body made of metal;   a unit outer cylindrical body made of metal; and   a venturi held in the unit inner cylindrical body;   
       wherein an upper portion of the unit inner cylindrical body upward mounted is concentrically fastened and held to an upper portion in the unit outer cylindrical body, and a lower portion of the unit inner cylindrical body is downward protruded from a lower end surface central portion of the unit outer cylindrical body,
 a lower end surface of the venturi held in an inner lower portion of the unit inner cylindrical body is downward protruded from a lower end surface central portion of the unit inner cylindrical body, 
 a tip nozzle portion downward protruded from a lower end center of a nozzle tube portion made of metal provided at a lower portion of the yarn and air supplier mounted in the unit inner cylindrical body from an upper portion of the unit outer cylindrical body faces the venture, and air flow is formed in a space between the tip nozzle portion and a mortar-like wall surface portion of the venturi, 
 the yarn and air supplier comprises a cylindrical nozzle tube portion and a tip nozzle portion downward protruded from a lower end center of the nozzle tube portion, and a circular handle portion is integrally attached to an upper end of the nozzle tube portion via a nozzle receiving cylindrical portion, a circular recessed portion for a circular upper portion of the unit outer cylindrical body to enter is provided on a bottom surface of the circular handle portion, a through hole from a central portion of an upper end of the nozzle tube portion to a lower end central portion of the nozzle tube portion is provided, a large-diameter tube portion comprising a positioning and securing mechanism is provided at the nozzle tube portion, and a portion from the lower portion of the large-diameter tube portion to a lower end thereof is provided as a small-diameter tube portion, 
 the upper portion of a through hole from a central portion of an upper end of the nozzle tube portion in the yarn and air supplier to a lower end central portion of the nozzle tube portion has a projection-circular portion, and a cylindrical inlet tube portion having an insertion hole is mounted therein and the axial fiber and the float are fed into an insertion hole of the inlet tube portion, an upper portion of the through hole is formed into a small-size tapered shape in a depth direction, a range from just beneath a portion of a tapered shape to a position equivalent to an end of the large-diameter tube portion is defined as a straight hole, and a taper hole whose diameter is reduced along a downward range from just beneath thereof to the vicinity of a lower end in the small-diameter tube portion is defined, a lower circular stepped portion is provided at a central portion of a lower end of the small-diameter tube portion, an upper end portion of the tip nozzle portion is concentrically mounted and fastened in a central position of the lower circular stepped portion, a nozzle taper hole is provided at the tip nozzle portion, the hole diameter of a lower-most end of the taper hole in the through hole and the hole diameter of an upper-most portion of the nozzle taper hole are set at the same to provide no step, and the axial fiber and the float are smoothly fed into the venturi from the through hole via the nozzle taper hole, 
 an air receiving concave portion positioned outside the taper hole capable of axially rotating is provided at a small-diameter tube portion of the nozzle tube portion in the yarn and air supplier, and a lower surface of the air receiving concave portion and the lower circular stepped portion are connected to provide two air holes for blowing air downward, 
 the unit inner cylindrical body provides a plan-view circular protruding tube portion which is laterally protruded at an upper portion thereof, an insertion tube portion whose diameter is smaller than that of a protruding tube portion is concentrically protruded downward from the protruding tube portion, a circular large-diameter tube portion receiving stepped portion into which a lower portion of the large-diameter tube portion of the yarn and air supplier is fitted is provided on an upper surface of the protruding tube portion of the unit inner cylindrical body, a unit inner cylindrical body through hole is provided from a central portion of the large-diameter tube portion receiving stepped portion to a lower end thereof via the inside of the insertion tube portion, a circular protruding portion whose internal diameter is smaller than the internal diameter of the unit inner cylindrical body through hole is provided at a lower end of the unit inner cylindrical body through hole of the unit inner cylindrical body to be inwardly protruded to the unit inner cylindrical body through hole to accept a lower end of the small-diameter tube portion of the yarn and air supplier, an O ring is attached to a side wall of the protruding tube portion of the unit inner cylindrical body, the O ring is closely spaced on an inner wall surface of the circular receiving hole portion when the protruding tube portion is mounted in a circular receiving hole portion of the unit outer cylindrical body, and an air through hole is provided at a side wall portion of the insertion tube portion in the unit inner cylindrical body, so that the air through hole comes to the position of a mounting receiving hole for the air receiving plug when the unit inner cylindrical body is mounted on the unit outer cylindrical body, 
 the unit outer cylindrical body is cylindrical, and a circular receiving hole portion at which the protruding tube portion of the unit inner cylindrical body is mounted is provided at an inner peripheral portion of the circular upper portion, and a through insertion hole whose diameter is smaller than that of the circular receiving hole portion to be through up to a lower end to penetrate the insertion tube portion of the unit inner cylindrical body is provided at a lower portion of the circular receiving hole portion, a mounting receiving hole for an air receiving plug which is connected to an air supply source via an air pipe is provided at a side wall portion of the unit outer cylindrical body, a circular recessed portion at which the circular receiving hole portion is opened is provided at an inner peripheral portion of a circular upper portion of the unit outer cylindrical body, and a flat C ring is mounted at the circular recessed portion, 
 the venturi held in the unit inner cylindrical body is overall cylindrical, a mortar-like wall surface portion whose diameter is reduced from an upper end surface on which the axial fiber and the float each enter in a downward direction is provided at an upper portion of the center inside thereof, a venturi through hole of a taper shape whose diameter is expanded toward a penetrated lower end is provided, so that the axial fiber and the float can pass from a deepest portion of the mortar-like wall surface portion to a lower end surface, 
 a tip nozzle portion of the yarn and air supplier is substantially overall cylindrical, and the nozzle taper hole which is through from an upper end surface to a lower end surface and whose diameter is reduced from an upper end surface to a lower end surface is provided, 
 a positioning and securing mechanism at the nozzle tube portion of the yarn and air supplier comprises the large-diameter tube portion of the yarn and air supplier and a retaining ring disposed on the unit inner cylindrical body in the unit outer cylindrical body, the retaining ring has a circular hole portion whose diameter is slightly larger than the external diameter of the large-diameter tube portion of the yarn and air supplier, and a small projection which functions as a semicircular or a trapezoidal positioning and abutting receiving portion which is inwardly protruded is provided at part of the circular hole portion, 
 a flat annular retaining ring is abutted against an upper end surface of the protruding tube portion of the unit inner cylindrical body while the unit inner cylindrical body is mounted to the unit outer cylindrical body, and the unit inner cylindrical body is held in the unit outer cylindrical body to be fastened by mounting an outer peripheral portion of the C ring disposed on the retaining ring at the circular recessed portion, 
 the yarn and air supplier is provided with a semicircular or a trapezoidal concave portion capable of being fitted into the large-diameter tube portion receiving stepped portion of the unit inner cylindrical body so that a lower portion of the large-diameter tube portion is not blocked by the small projection while the small projection is positioned to the large-diameter tube portion, and an inclined outer peripheral portion for forming an inclined groove from one end of the concave portion to a lower surface outer peripheral portion of the nozzle receiving cylindrical portion provided in a position at an angle of 180 degrees in a circumferential direction of the large-diameter tube portion, and the inclined outer peripheral portion is formed so that the wall thickness is small at the concave portion and the wall thickness becomes large as it is away from the concave portion, thereby making a lower surface of an inclined groove inclined, accordingly the unit inner cylindrical body is mounted on the unit outer cylindrical body to be fastened, and thereafter the yarn and air supplier are positioned to be mounted in the unit inner cylindrical body, subsequently by rotating the circular handle portion, a lower surface of the inclined groove of the positioning and securing mechanism is pressed against a lower surface of the small projection of the retaining ring, so that the yarn and air supplier can be secured and fastened to the unit outer cylindrical body, and the air receiving concave portion of the yarn and air supplier faces the air through hole of the unit inner cylindrical body, 
 the axial fiber and the float fed into the unit for air entangling via a step of feeding an axial fiber and a float in the yarn and air supplier pass through an inlet tube portion, a through hole and a tip nozzle portion of the yarn and air supplier to enter the mortar-like wall surface portion in the venturi, air fed into the air receiving plug reaches the air receiving concave portion in the unit for air entangling, and the air is fed into a space formed by the mortar-like wall surface portion via the air hole, and it is blown to an inclined surface of the mortar-like wall surface portion and dispersed, accordingly the float which enters the space formed by the mortar-like wall surface portion of the venturi is disturbed by air flow which is dispersed in the space, and filaments of the axial fiber and the float are united to be entangled, connected and integrated to form the down-like cotton material in a cotton-like form having a down ball-like mass in an aligned form, and 
 the size of the down ball-like mass of the down-like cotton material, the interval between down ball-like masses and the float density are changed in various ways by combining production factors such as the ratio of feeding the float to the axial fiber, the air volume and the air pressure from the air supply source in the unit for air entangling, the gap interval from an end of the tip nozzle portion of the yarn and air supplier to a deepest portion of the mortar-like wall surface portion of the venturi to produce the down-like cotton material. 
 
     
     
         27 . The method for producing a down-like cotton material according to  claim 16 , wherein the unit for air entangling is connected an air supply source capable of adjusting the air pressure and the air volume for feeding compressed air for air entangling into an air receiving plug provided in the unit for air entangling via an air pipe comprising:
 a yarn and air supplier;   a unit inner cylindrical body made of metal;   a unit outer cylindrical body made of metal; and   a venturi held in the unit inner cylindrical body;   
       wherein an upper portion of the unit inner cylindrical body upward mounted is concentrically fastened and held to an upper portion in the unit outer cylindrical body, and a lower portion of the unit inner cylindrical body is downward protruded from a lower end surface central portion of the unit outer cylindrical body,
 a lower end surface of the venturi held in an inner lower portion of the unit inner cylindrical body is downward protruded from a lower end surface central portion of the unit inner cylindrical body, 
 a tip nozzle portion downward protruded from a lower end center of a nozzle tube portion made of metal provided at a lower portion of the yarn and air supplier mounted in the unit inner cylindrical body from an upper portion of the unit outer cylindrical body faces the venture, and air flow is formed in a space between the tip nozzle portion and a mortar-like wall surface portion of the venturi, 
 the yarn and air supplier comprises a cylindrical nozzle tube portion and a tip nozzle portion downward protruded from a lower end center of the nozzle tube portion, and a circular handle portion is integrally attached to an upper end of the nozzle tube portion via a nozzle receiving cylindrical portion, a circular recessed portion for a circular upper portion of the unit outer cylindrical body to enter is provided on a bottom surface of the circular handle portion, a through hole from a central portion of an upper end of the nozzle tube portion to a lower end central portion of the nozzle tube portion is provided, a large-diameter tube portion comprising a positioning and securing mechanism is provided at the nozzle tube portion, and a portion from the lower portion of the large-diameter tube portion to a lower end thereof is provided as a small-diameter tube portion, 
 the upper portion of a through hole from a central portion of an upper end of the nozzle tube portion in the yarn and air supplier to a lower end central portion of the nozzle tube portion has a projection-circular portion, and a cylindrical inlet tube portion having an insertion hole is mounted therein and the axial fiber and the float are fed into an insertion hole of the inlet tube portion, an upper portion of the through hole is formed into a small-size tapered shape in a depth direction, a range from just beneath a portion of a tapered shape to a position equivalent to an end of the large-diameter tube portion is defined as a straight hole, and a taper hole whose diameter is reduced along a downward range from just beneath thereof to the vicinity of a lower end in the small-diameter tube portion is defined, a lower circular stepped portion is provided at a central portion of a lower end of the small-diameter tube portion, an upper end portion of the tip nozzle portion is concentrically mounted and fastened in a central position of the lower circular stepped portion, a nozzle taper hole is provided at the tip nozzle portion, the hole diameter of a lower-most end of the taper hole in the through hole and the hole diameter of an upper-most portion of the nozzle taper hole are set at the same to provide no step, and the axial fiber and the float are smoothly fed into the venturi from the through hole via the nozzle taper hole, 
 an air receiving concave portion positioned outside the taper hole capable of axially rotating is provided at a small-diameter tube portion of the nozzle tube portion in the yarn and air supplier, and a lower surface of the air receiving concave portion and the lower circular stepped portion are connected to provide two air holes for blowing air downward, 
 the unit inner cylindrical body provides a plan-view circular protruding tube portion which is laterally protruded at an upper portion thereof, an insertion tube portion whose diameter is smaller than that of a protruding tube portion is concentrically protruded downward from the protruding tube portion, a circular large-diameter tube portion receiving stepped portion into which a lower portion of the large-diameter tube portion of the yarn and air supplier is fitted is provided on an upper surface of the protruding tube portion of the unit inner cylindrical body, a unit inner cylindrical body through hole is provided from a central portion of the large-diameter tube portion receiving stepped portion to a lower end thereof via the inside of the insertion tube portion, a circular protruding portion whose internal diameter is smaller than the internal diameter of the unit inner cylindrical body through hole is provided at a lower end of the unit inner cylindrical body through hole of the unit inner cylindrical body to be inwardly protruded to the unit inner cylindrical body through hole to accept a lower end of the small-diameter tube portion of the yarn and air supplier, an O ring is attached to a side wall of the protruding tube portion of the unit inner cylindrical body, the O ring is closely spaced on an inner wall surface of the circular receiving hole portion when the protruding tube portion is mounted in a circular receiving hole portion of the unit outer cylindrical body, and an air through hole is provided at a side wall portion of the insertion tube portion in the unit inner cylindrical body, so that the air through hole comes to the position of a mounting receiving hole for the air receiving plug when the unit inner cylindrical body is mounted on the unit outer cylindrical body, 
 the unit outer cylindrical body is cylindrical, and a circular receiving hole portion at which the protruding tube portion of the unit inner cylindrical body is mounted is provided at an inner peripheral portion of the circular upper portion, and a through insertion hole whose diameter is smaller than that of the circular receiving hole portion to be through up to a lower end to penetrate the insertion tube portion of the unit inner cylindrical body is provided at a lower portion of the circular receiving hole portion, a mounting receiving hole for an air receiving plug which is connected to an air supply source via an air pipe is provided at a side wall portion of the unit outer cylindrical body, a circular recessed portion at which the circular receiving hole portion is opened is provided at an inner peripheral portion of a circular upper portion of the unit outer cylindrical body, and a flat C ring is mounted at the circular recessed portion, 
 the venturi held in the unit inner cylindrical body is overall cylindrical, a mortar-like wall surface portion whose diameter is reduced from an upper end surface on which the axial fiber and the float each enter in a downward direction is provided at an upper portion of the center inside thereof, a venturi through hole of a taper shape whose diameter is expanded toward a penetrated lower end is provided, so that the axial fiber and the float can pass from a deepest portion of the mortar-like wall surface portion to a lower end surface, 
 a tip nozzle portion of the yarn and air supplier is substantially overall cylindrical, and the nozzle taper hole which is through from an upper end surface to a lower end surface and whose diameter is reduced from an upper end surface to a lower end surface is provided, 
 a positioning and securing mechanism at the nozzle tube portion of the yarn and air supplier comprises the large-diameter tube portion of the yarn and air supplier and a retaining ring disposed on the unit inner cylindrical body in the unit outer cylindrical body, the retaining ring has a circular hole portion whose diameter is slightly larger than the external diameter of the large-diameter tube portion of the yarn and air supplier, and a small projection which functions as a semicircular or a trapezoidal positioning and abutting receiving portion which is inwardly protruded is provided at part of the circular hole portion, 
 a flat annular retaining ring is abutted against an upper end surface of the protruding tube portion of the unit inner cylindrical body while the unit inner cylindrical body is mounted to the unit outer cylindrical body, and the unit inner cylindrical body is held in the unit outer cylindrical body to be fastened by mounting an outer peripheral portion of the C ring disposed on the retaining ring at the circular recessed portion, 
 the yarn and air supplier is provided with a semicircular or a trapezoidal concave portion capable of being fitted into the large-diameter tube portion receiving stepped portion of the unit inner cylindrical body so that a lower portion of the large-diameter tube portion is not blocked by the small projection while the small projection is positioned to the large-diameter tube portion, and an inclined outer peripheral portion for forming an inclined groove from one end of the concave portion to a lower surface outer peripheral portion of the nozzle receiving cylindrical portion provided in a position at an angle of  180  degrees in a circumferential direction of the large-diameter tube portion, and the inclined outer peripheral portion is formed so that the wall thickness is small at the concave portion and the wall thickness becomes large as it is away from the concave portion, thereby making a lower surface of an inclined groove inclined, accordingly the unit inner cylindrical body is mounted on the unit outer cylindrical body to be fastened, and thereafter the yarn and air supplier are positioned to be mounted in the unit inner cylindrical body, subsequently by rotating the circular handle portion, a lower surface of the inclined groove of the positioning and securing mechanism is pressed against a lower surface of the small projection of the retaining ring, so that the yarn and air supplier can be secured and fastened to the unit outer cylindrical body, and the air receiving concave portion of the yarn and air supplier faces the air through hole of the unit inner cylindrical body, 
 the axial fiber and the float fed into the unit for air entangling via a step of feeding an axial fiber and a float in the yarn and air supplier pass through an inlet tube portion, a through hole and a tip nozzle portion of the yarn and air supplier to enter the mortar-like wall surface portion in the venturi, air fed into the air receiving plug reaches the air receiving concave portion in the unit for air entangling, and the air is fed into a space formed by the mortar-like wall surface portion via the air hole, and it is blown to an inclined surface of the mortar-like wall surface portion and dispersed, accordingly the float which enters the space formed by the mortar-like wall surface portion of the venturi is disturbed by air flow which is dispersed in the space, and filaments of the axial fiber and the float are united to be entangled, connected and integrated to form the down-like cotton material in a cotton-like form having a down ball-like mass in an aligned form, and 
 the size of the down ball-like mass of the down-like cotton material, the interval between down ball-like masses and the float density are changed in various ways by combining production factors such as the ratio of feeding the float to the axial fiber, the air volume and the air pressure from the air supply source in the unit for air entangling, the gap interval from an end of the tip nozzle portion of the yarn and air supplier to a deepest portion of the mortar-like wall surface portion of the venturi to produce the down-like cotton material. 
 
     
     
         28 . The method for producing a down-like cotton material according to  claim 17 , wherein the unit for air entangling is connected an air supply source capable of adjusting the air pressure and the air volume for feeding compressed air for air entangling into an air receiving plug provided in the unit for air entangling via an air pipe comprising:
 a yarn and air supplier;   a unit inner cylindrical body made of metal;   a unit outer cylindrical body made of metal; and   a venturi held in the unit inner cylindrical body;   
       wherein an upper portion of the unit inner cylindrical body upward mounted is concentrically fastened and held to an upper portion in the unit outer cylindrical body, and a lower portion of the unit inner cylindrical body is downward protruded from a lower end surface central portion of the unit outer cylindrical body,
 a lower end surface of the venturi held in an inner lower portion of the unit inner cylindrical body is downward protruded from a lower end surface central portion of the unit inner cylindrical body, 
 a tip nozzle portion downward protruded from a lower end center of a nozzle tube portion made of metal provided at a lower portion of the yarn and air supplier mounted in the unit inner cylindrical body from an upper portion of the unit outer cylindrical body faces the venture, and air flow is formed in a space between the tip nozzle portion and a mortar-like wall surface portion of the venturi, 
 the yarn and air supplier comprises a cylindrical nozzle tube portion and a tip nozzle portion downward protruded from a lower end center of the nozzle tube portion, and a circular handle portion is integrally attached to an upper end of the nozzle tube portion via a nozzle receiving cylindrical portion, a circular recessed portion for a circular upper portion of the unit outer cylindrical body to enter is provided on a bottom surface of the circular handle portion, a through hole from a central portion of an upper end of the nozzle tube portion to a lower end central portion of the nozzle tube portion is provided, a large-diameter tube portion comprising a positioning and securing mechanism is provided at the nozzle tube portion, and a portion from the lower portion of the large-diameter tube portion to a lower end thereof is provided as a small-diameter tube portion, 
 the upper portion of a through hole from a central portion of an upper end of the nozzle tube portion in the yarn and air supplier to a lower end central portion of the nozzle tube portion has a projection-circular portion, and a cylindrical inlet tube portion having an insertion hole is mounted therein and the axial fiber and the float are fed into an insertion hole of the inlet tube portion, an upper portion of the through hole is formed into a small-size tapered shape in a depth direction, a range from just beneath a portion of a tapered shape to a position equivalent to an end of the large-diameter tube portion is defined as a straight hole, and a taper hole whose diameter is reduced along a downward range from just beneath thereof to the vicinity of a lower end in the small-diameter tube portion is defined, a lower circular stepped portion is provided at a central portion of a lower end of the small-diameter tube portion, an upper end portion of the tip nozzle portion is concentrically mounted and fastened in a central position of the lower circular stepped portion, a nozzle taper hole is provided at the tip nozzle portion, the hole diameter of a lower-most end of the taper hole in the through hole and the hole diameter of an upper-most portion of the nozzle taper hole are set at the same to provide no step, and the axial fiber and the float are smoothly fed into the venturi from the through hole via the nozzle taper hole, 
 an air receiving concave portion positioned outside the taper hole capable of axially rotating is provided at a small-diameter tube portion of the nozzle tube portion in the yarn and air supplier, and a lower surface of the air receiving concave portion and the lower circular stepped portion are connected to provide two air holes for blowing air downward, 
 the unit inner cylindrical body provides a plan-view circular protruding tube portion which is laterally protruded at an upper portion thereof, an insertion tube portion whose diameter is smaller than that of a protruding tube portion is concentrically protruded downward from the protruding tube portion, a circular large-diameter tube portion receiving stepped portion into which a lower portion of the large-diameter tube portion of the yarn and air supplier is fitted is provided on an upper surface of the protruding tube portion of the unit inner cylindrical body, a unit inner cylindrical body through hole is provided from a central portion of the large-diameter tube portion receiving stepped portion to a lower end thereof via the inside of the insertion tube portion, a circular protruding portion whose internal diameter is smaller than the internal diameter of the unit inner cylindrical body through hole is provided at a lower end of the unit inner cylindrical body through hole of the unit inner cylindrical body to be inwardly protruded to the unit inner cylindrical body through hole to accept a lower end of the small-diameter tube portion of the yarn and air supplier, an O ring is attached to a side wall of the protruding tube portion of the unit inner cylindrical body, the O ring is closely spaced on an inner wall surface of the circular receiving hole portion when the protruding tube portion is mounted in a circular receiving hole portion of the unit outer cylindrical body, and an air through hole is provided at a side wall portion of the insertion tube portion in the unit inner cylindrical body, so that the air through hole comes to the position of a mounting receiving hole for the air receiving plug when the unit inner cylindrical body is mounted on the unit outer cylindrical body, 
 the unit outer cylindrical body is cylindrical, and a circular receiving hole portion at which the protruding tube portion of the unit inner cylindrical body is mounted is provided at an inner peripheral portion of the circular upper portion, and a through insertion hole whose diameter is smaller than that of the circular receiving hole portion to be through up to a lower end to penetrate the insertion tube portion of the unit inner cylindrical body is provided at a lower portion of the circular receiving hole portion, a mounting receiving hole for an air receiving plug which is connected to an air supply source via an air pipe is provided at a side wall portion of the unit outer cylindrical body, a circular recessed portion at which the circular receiving hole portion is opened is provided at an inner peripheral portion of a circular upper portion of the unit outer cylindrical body, and a flat C ring is mounted at the circular recessed portion, 
 the venturi held in the unit inner cylindrical body is overall cylindrical, a mortar-like wall surface portion whose diameter is reduced from an upper end surface on which the axial fiber and the float each enter in a downward direction is provided at an upper portion of the center inside thereof, a venturi through hole of a taper shape whose diameter is expanded toward a penetrated lower end is provided, so that the axial fiber and the float can pass from a deepest portion of the mortar-like wall surface portion to a lower end surface, 
 a tip nozzle portion of the yarn and air supplier is substantially overall cylindrical, and the nozzle taper hole which is through from an upper end surface to a lower end surface and whose diameter is reduced from an upper end surface to a lower end surface is provided, 
 a positioning and securing mechanism at the nozzle tube portion of the yarn and air supplier comprises the large-diameter tube portion of the yarn and air supplier and a retaining ring disposed on the unit inner cylindrical body in the unit outer cylindrical body, the retaining ring has a circular hole portion whose diameter is slightly larger than the external diameter of the large-diameter tube portion of the yarn and air supplier, and a small projection which functions as a semicircular or a trapezoidal positioning and abutting receiving portion which is inwardly protruded is provided at part of the circular hole portion, 
 a flat annular retaining ring is abutted against an upper end surface of the protruding tube portion of the unit inner cylindrical body while the unit inner cylindrical body is mounted to the unit outer cylindrical body, and the unit inner cylindrical body is held in the unit outer cylindrical body to be fastened by mounting an outer peripheral portion of the C ring disposed on the retaining ring at the circular recessed portion, 
 the yarn and air supplier is provided with a semicircular or a trapezoidal concave portion capable of being fitted into the large-diameter tube portion receiving stepped portion of the unit inner cylindrical body so that a lower portion of the large-diameter tube portion is not blocked by the small projection while the small projection is positioned to the large-diameter tube portion, and an inclined outer peripheral portion for forming an inclined groove from one end of the concave portion to a lower surface outer peripheral portion of the nozzle receiving cylindrical portion provided in a position at an angle of 180 degrees in a circumferential direction of the large-diameter tube portion, and the inclined outer peripheral portion is formed so that the wall thickness is small at the concave portion and the wall thickness becomes large as it is away from the concave portion, thereby making a lower surface of an inclined groove inclined, accordingly the unit inner cylindrical body is mounted on the unit outer cylindrical body to be fastened, and thereafter the yarn and air supplier are positioned to be mounted in the unit inner cylindrical body, subsequently by rotating the circular handle portion, a lower surface of the inclined groove of the positioning and securing mechanism is pressed against a lower surface of the small projection of the retaining ring, so that the yarn and air supplier can be secured and fastened to the unit outer cylindrical body, and the air receiving concave portion of the yarn and air supplier faces the air through hole of the unit inner cylindrical body, 
 the axial fiber and the float fed into the unit for air entangling via a step of feeding an axial fiber and a float in the yarn and air supplier pass through an inlet tube portion, a through hole and a tip nozzle portion of the yarn and air supplier to enter the mortar-like wall surface portion in the venturi, air fed into the air receiving plug reaches the air receiving concave portion in the unit for air entangling, and the air is fed into a space formed by the mortar-like wall surface portion via the air hole, and it is blown to an inclined surface of the mortar-like wall surface portion and dispersed, accordingly the float which enters the space formed by the mortar-like wall surface portion of the venturi is disturbed by air flow which is dispersed in the space, and filaments of the axial fiber and the float are united to be entangled, connected and integrated to form the down-like cotton material in a cotton-like form having a down ball-like mass in an aligned form, and 
 the size of the down ball-like mass of the down-like cotton material, the interval between down ball-like masses and the float density are changed in various ways by combining production factors such as the ratio of feeding the float to the axial fiber, the air volume and the air pressure from the air supply source in the unit for air entangling, the gap interval from an end of the tip nozzle portion of the yarn and air supplier to a deepest portion of the mortar-like wall surface portion of the venturi to produce the down-like cotton material. 
 
     
     
         29 . The method for producing a down-like cotton material according to  claim 18 , wherein the unit for air entangling is connected an air supply source capable of adjusting the air pressure and the air volume for feeding compressed air for air entangling into an air receiving plug provided in the unit for air entangling via an air pipe comprising:
 a yarn and air supplier;   a unit inner cylindrical body made of metal;   a unit outer cylindrical body made of metal; and   a venturi held in the unit inner cylindrical body;   
       wherein an upper portion of the unit inner cylindrical body upward mounted is concentrically fastened and held to an upper portion in the unit outer cylindrical body, and a lower portion of the unit inner cylindrical body is downward protruded from a lower end surface central portion of the unit outer cylindrical body,
 a lower end surface of the venturi held in an inner lower portion of the unit inner cylindrical body is downward protruded from a lower end surface central portion of the unit inner cylindrical body, 
 a tip nozzle portion downward protruded from a lower end center of a nozzle tube portion made of metal provided at a lower portion of the yarn and air supplier mounted in the unit inner cylindrical body from an upper portion of the unit outer cylindrical body faces the venture, and air flow is formed in a space between the tip nozzle portion and a mortar-like wall surface portion of the venturi, 
 the yarn and air supplier comprises a cylindrical nozzle tube portion and a tip nozzle portion downward protruded from a lower end center of the nozzle tube portion, and a circular handle portion is integrally attached to an upper end of the nozzle tube portion via a nozzle receiving cylindrical portion, a circular recessed portion for a circular upper portion of the unit outer cylindrical body to enter is provided on a bottom surface of the circular handle portion, a through hole from a central portion of an upper end of the nozzle tube portion to a lower end central portion of the nozzle tube portion is provided, a large-diameter tube portion comprising a positioning and securing mechanism is provided at the nozzle tube portion, and a portion from the lower portion of the large-diameter tube portion to a lower end thereof is provided as a small-diameter tube portion, 
 the upper portion of a through hole from a central portion of an upper end of the nozzle tube portion in the yarn and air supplier to a lower end central portion of the nozzle tube portion has a projection-circular portion, and a cylindrical inlet tube portion having an insertion hole is mounted therein and the axial fiber and the float are fed into an insertion hole of the inlet tube portion, an upper portion of the through hole is formed into a small-size tapered shape in a depth direction, a range from just beneath a portion of a tapered shape to a position equivalent to an end of the large-diameter tube portion is defined as a straight hole, and a taper hole whose diameter is reduced along a downward range from just beneath thereof to the vicinity of a lower end in the small-diameter tube portion is defined, a lower circular stepped portion is provided at a central portion of a lower end of the small-diameter tube portion, an upper end portion of the tip nozzle portion is concentrically mounted and fastened in a central position of the lower circular stepped portion, a nozzle taper hole is provided at the tip nozzle portion, the hole diameter of a lower-most end of the taper hole in the through hole and the hole diameter of an upper-most portion of the nozzle taper hole are set at the same to provide no step, and the axial fiber and the float are smoothly fed into the venturi from the through hole via the nozzle taper hole, 
 an air receiving concave portion positioned outside the taper hole capable of axially rotating is provided at a small-diameter tube portion of the nozzle tube portion in the yarn and air supplier, and a lower surface of the air receiving concave portion and the lower circular stepped portion are connected to provide two air holes for blowing air downward, 
 the unit inner cylindrical body provides a plan-view circular protruding tube portion which is laterally protruded at an upper portion thereof, an insertion tube portion whose diameter is smaller than that of a protruding tube portion is concentrically protruded downward from the protruding tube portion, a circular large-diameter tube portion receiving stepped portion into which a lower portion of the large-diameter tube portion of the yarn and air supplier is fitted is provided on an upper surface of the protruding tube portion of the unit inner cylindrical body, a unit inner cylindrical body through hole is provided from a central portion of the large-diameter tube portion receiving stepped portion to a lower end thereof via the inside of the insertion tube portion, a circular protruding portion whose internal diameter is smaller than the internal diameter of the unit inner cylindrical body through hole is provided at a lower end of the unit inner cylindrical body through hole of the unit inner cylindrical body to be inwardly protruded to the unit inner cylindrical body through hole to accept a lower end of the small-diameter tube portion of the yarn and air supplier, an O ring is attached to a side wall of the protruding tube portion of the unit inner cylindrical body, the O ring is closely spaced on an inner wall surface of the circular receiving hole portion when the protruding tube portion is mounted in a circular receiving hole portion of the unit outer cylindrical body, and an air through hole is provided at a side wall portion of the insertion tube portion in the unit inner cylindrical body, so that the air through hole comes to the position of a mounting receiving hole for the air receiving plug when the unit inner cylindrical body is mounted on the unit outer cylindrical body, 
 the unit outer cylindrical body is cylindrical, and a circular receiving hole portion at which the protruding tube portion of the unit inner cylindrical body is mounted is provided at an inner peripheral portion of the circular upper portion, and a through insertion hole whose diameter is smaller than that of the circular receiving hole portion to be through up to a lower end to penetrate the insertion tube portion of the unit inner cylindrical body is provided at a lower portion of the circular receiving hole portion, a mounting receiving hole for an air receiving plug which is connected to an air supply source via an air pipe is provided at a side wall portion of the unit outer cylindrical body, a circular recessed portion at which the circular receiving hole portion is opened is provided at an inner peripheral portion of a circular upper portion of the unit outer cylindrical body, and a flat C ring is mounted at the circular recessed portion, 
 the venturi held in the unit inner cylindrical body is overall cylindrical, a mortar-like wall surface portion whose diameter is reduced from an upper end surface on which the axial fiber and the float each enter in a downward direction is provided at an upper portion of the center inside thereof, a venturi through hole of a taper shape whose diameter is expanded toward a penetrated lower end is provided, so that the axial fiber and the float can pass from a deepest portion of the mortar-like wall surface portion to a lower end surface, 
 a tip nozzle portion of the yarn and air supplier is substantially overall cylindrical, and the nozzle taper hole which is through from an upper end surface to a lower end surface and whose diameter is reduced from an upper end surface to a lower end surface is provided, 
 a positioning and securing mechanism at the nozzle tube portion of the yarn and air supplier comprises the large-diameter tube portion of the yarn and air supplier and a retaining ring disposed on the unit inner cylindrical body in the unit outer cylindrical body, the retaining ring has a circular hole portion whose diameter is slightly larger than the external diameter of the large-diameter tube portion of the yarn and air supplier, and a small projection which functions as a semicircular or a trapezoidal positioning and abutting receiving portion which is inwardly protruded is provided at part of the circular hole portion, 
 a flat annular retaining ring is abutted against an upper end surface of the protruding tube portion of the unit inner cylindrical body while the unit inner cylindrical body is mounted to the unit outer cylindrical body, and the unit inner cylindrical body is held in the unit outer cylindrical body to be fastened by mounting an outer peripheral portion of the C ring disposed on the retaining ring at the circular recessed portion, 
 the yarn and air supplier is provided with a semicircular or a trapezoidal concave portion capable of being fitted into the large-diameter tube portion receiving stepped portion of the unit inner cylindrical body so that a lower portion of the large-diameter tube portion is not blocked by the small projection while the small projection is positioned to the large-diameter tube portion, and an inclined outer peripheral portion for forming an inclined groove from one end of the concave portion to a lower surface outer peripheral portion of the nozzle receiving cylindrical portion provided in a position at an angle of 180 degrees in a circumferential direction of the large-diameter tube portion, and the inclined outer peripheral portion is formed so that the wall thickness is small at the concave portion and the wall thickness becomes large as it is away from the concave portion, thereby making a lower surface of an inclined groove inclined, accordingly the unit inner cylindrical body is mounted on the unit outer cylindrical body to be fastened, and thereafter the yarn and air supplier are positioned to be mounted in the unit inner cylindrical body, subsequently by rotating the circular handle portion, a lower surface of the inclined groove of the positioning and securing mechanism is pressed against a lower surface of the small projection of the retaining ring, so that the yarn and air supplier can be secured and fastened to the unit outer cylindrical body, and the air receiving concave portion of the yarn and air supplier faces the air through hole of the unit inner cylindrical body, 
 the axial fiber and the float fed into the unit for air entangling via a step of feeding an axial fiber and a float in the yarn and air supplier pass through an inlet tube portion, a through hole and a tip nozzle portion of the yarn and air supplier to enter the mortar-like wall surface portion in the venturi, air fed into the air receiving plug reaches the air receiving concave portion in the unit for air entangling, and the air is fed into a space formed by the mortar-like wall surface portion via the air hole, and it is blown to an inclined surface of the mortar-like wall surface portion and dispersed, accordingly the float which enters the space formed by the mortar-like wall surface portion of the venturi is disturbed by air flow which is dispersed in the space, and filaments of the axial fiber and the float are united to be entangled, connected and integrated to form the down-like cotton material in a cotton-like form having a down ball-like mass in an aligned form, and 
 the size of the down ball-like mass of the down-like cotton material, the interval between down ball-like masses and the float density are changed in various ways by combining production factors such as the ratio of feeding the float to the axial fiber, the air volume and the air pressure from the air supply source in the unit for air entangling, the gap interval from an end of the tip nozzle portion of the yarn and air supplier to a deepest portion of the mortar-like wall surface portion of the venturi to produce the down-like cotton material.