Structure of air passage of sealable bag, sealable bag, and method of manufacturing the sealable bag

Abstract

A structure of an air passage of a sealable bag is provided wherein bag sheets 11, 12 and a valve body sheet 31 layered between the bag sheets 11, 12 are used. The valve body sheet 31 comprises a front piece 31 a and a rear piece 31 b , and a air passing space is formed between the front bag sheet 11 and the front piece 31 a , as well as between the rear bag sheet 12 and the rear piece 31 b , while a dead-end space is formed between the front piece 31 a and the rear piece 31 b . In said valve body, at one side based on the direction of flow of air in the air passage 3 , said dead-end space is closed by said front piece 31 a and rear piece 31 b that are joined together, while on the other side, said dead-end space is opened by said front piece 31 a and the rear piece 31 b that are separated from each other.

1 . A structure of an air passage of a sealable bag used for a sealable bag ( 1 ) in which a sealable zone ( 2 ) can be hermetically sealed, the sealable zone ( 2 ) being connected to the outside of the bag in order to be able to discharge air and gas in the zone ( 2 ) to outside the bag then maintain the discharged state, or in order to be able to fill the zone ( 2 ) with air and gas then maintain the charged state; and an inner connecting part ( 3   a ) leading to the sealable zone ( 2 ) and an outer connecting part ( 3   b ) leading to the outside of the bag are provided thereby allowing a flow of air in one direction while preventing in the other direction when air and gas are discharged or filled as mentioned above, wherein
 bag sheets ( 11 ,  12 ) and a valve body sheet ( 31 ), being made of resin and thus flexible, are used; the bag sheets ( 11 ,  12 ) being placed facing each other, the valve body sheet ( 31 ) being layered between said bag sheets ( 11 ,  12 ) and having at least a front piece ( 31   a ) and a rear piece ( 31   b ), the pieces being overlapped, wherein   an air passing space ( 3   x ) is formed between the front bag sheet ( 11 ) and the front piece ( 31   a ), as well as between the rear bag sheet ( 12 ) and the rear piece ( 31   b ) in a manner to be able to pass and shut off air and gas, while a dead-end space ( 3   y ) is formed between the front piece ( 31   a ) and the rear piece ( 31   b ), and an inner connecting part ( 3   a ) provided at least at one part between the sealable zone ( 2 ) and air passage ( 3 ) allows air and gas pass therebetween;   an outer connecting part ( 3   b ) provided at least at one part between the air passage ( 3 ) and the outside of the bag allows air and gas pass therebetween;   a horizontal flowinging section ( 3   c ) is provided between the inner connecting part ( 3   a ) and the outer connecting part ( 3   b ) to pass a flow of air via the air passing space ( 3   x ), wherein   in the valve sheet ( 31 ), based on the direction of the flow of air through the air passage  3 , one side of the dead-end space ( 3   y ) is closed by the portion where the front piece ( 31   a ) and the rear piece ( 31   b ) are joined together, while the other side of the dead-end space ( 3   y ) is opened by the front piece ( 31   a ) and the rear piece ( 31   b ) separated from each other.   
   
   
       2 . The structure of an air passage of the sealable bag according to Claim  1 , wherein said valve body sheet ( 31 ) is configured by folding one sheet, thereby one side of the valve body sheet ( 31 ) sandwiching a folding portion ( 31   c ) running in the longitudinal direction is the front piece ( 31   a ), and the other side thereof is the rear piece ( 31   b ), and part of said folding part ( 31   c ) is disposed in said inner connecting part ( 3   a ). 
   
   
       3 . The structure of an air passage of a sealable bag according to Claim  1 , wherein said valve body sheet ( 31 ) is configured by folding one sheet, thereby one side of the valve body sheet ( 31 ) sandwiching a folding portion ( 31   c ) running in the longitudinal direction is the front piece ( 31   a ), and the other side thereof is the rear piece ( 31   b ), and part of said folding part ( 31   c ) is disposed in said outer connecting part ( 3   b ). 
   
   
       4 . The structure of an air passage of a sealable bag according to any of Claim  1 , wherein a contacting surface ( 31   d ) of the valve body sheet ( 31 ) contacting to each bag sheet ( 11 ,  12 ), is provided with weak adhesion. 
   
   
       5 . A sealable bag with bag sheets ( 11 ,  12 ) and a valve body sheet ( 31 ), the sheets being made of resin and thus flexible, the bag comprising a sealable zone ( 2 ) that is formed between the front bag sheet ( 11 ) and can be hermetically sealed; and an air passage ( 3 ) formed in a manner to be along at least one side ( 2   a ) of the sealable zone ( 2 ), further the valve body sheet ( 31 ) being disposed in the air passage ( 3 ) in a manner to be layered between the bag sheets ( 11 ,  12 ), wherein;
 said valve body sheet ( 31 ) has at least a front piece ( 31   a ) and a rear piece ( 31   b ), the pieces being overlapped, wherein   an air passing space ( 3   x ) is formed between the front bag sheet ( 11 ) and the front piece ( 31   a ), as well as between the rear bag sheet ( 12 ) and the rear piece ( 31   b ) in a manner to be able to pass and shut off air and gas, while a dead-end space ( 3   y ) is formed between the front piece ( 31   a ) and the rear piece ( 31   b ), wherein   an inner connecting part ( 3   a ) provided at least at one part between the sealable zone ( 2 ) and air passage ( 3 ) allows air and gas pass therebetween;   an outer connecting part ( 3   b ) provided at least at one part between the air passage ( 3 ) and the outside of the bag allows air and gas pass therebetween;   a horizontal flowinging section ( 3   c ) is provided between the inner connecting part ( 3   a ) and the outer connecting part ( 3   b ) to pass a flow of air via the air passing space ( 3   x ), wherein   in the valve sheet ( 31 ), based on the direction of the flow of air through the air passage  3 , one side of the dead-end space ( 3   y ) is closed by the portion where front piece ( 31   a ) and the rear piece ( 31   b ) are joined together, while the other side of the dead-end space ( 3   y ) is opened by the front piece ( 31   a ) and the rear piece ( 31   b ) separated from each other.   
   
   
       6 . The sealable bag according to Claim  5 , wherein said valve body sheet ( 31 ) is configured by folding one sheet, thereby one side of the valve body sheet ( 31 ) sandwiching a folding portion ( 31   c ) running in the longitudinal direction is the front piece ( 31   a ), and the other side thereof is the rear piece ( 31 ), and part of said folding part ( 31   c ) is disposed in said inner connecting part ( 3   a ). 
   
   
       7 . The sealable bag according to Claim  5 , wherein said valve body sheet ( 31 ) is configured by folding one sheet, thereby one side of the valve body sheet ( 31 ) sandwiching a folding portion ( 31   c ) running in the longitudinal direction is the front piece ( 31   a ), and the other side thereof is the rear piece ( 31 ), and part of said folding part ( 31   c ) is disposed in said outer connecting part ( 3   b ). 
   
   
       8 . The sealable bag according to any of Claim  5  wherein;
 said sealable zone ( 2 ) is a space defined by a sealable zone defining seal ( 14 ) that extends laterally and is a portion where at least said bag sheets ( 11 ,  12 ) are adhered together, and defined by side seals ( 16 ) defining the left and right sides of the sealable bag ( 1 ), the space being above the sealable zone defining seal ( 14 );   said air passage ( 3 ) is a space defined by said sealable zone defining seal ( 14 ), said bag side seals ( 16 ), and a bottom seal ( 15 ) that is a portion where at least said beg sheets ( 11 ,  12 ) are adhered together and defines the lower end of the sealable bag ( 1 ), the space being below the sealable zone defining seal ( 14 ); wherein   the sealable zone dividing seal ( 14 ) is not provided in said inner connecting part ( 3   a );   the bottom seal ( 15 ) or the bag side seal ( 16 ) is not provided in said outer connecting part ( 3   b ); wherein   the inner connecting part ( 3   a ) and the outer connecting part ( 3   b ) are not provided in a position where the two vertically coincide with each other.   
   
   
       9 . The sealable bag according to any of Claim  5 , wherein a spacer member ( 32 ) is disposed between the front piece ( 31   a ) and the rear piece ( 31   b ) in a manner to be sandwiched by the pieces. 
   
   
       10 . The sealable bag according to Claim  9 , wherein said interval spacer member ( 32 ) is selected among a filament substance, unwoven fabrics, nets, woven fabrics, paper, and resin sheet without breathability. 
   
   
       11 . A method of manufacturing a sealable bag, the sealable bag ( 1 ) in which a sealable zone ( 2 ) can be hermetically sealed and discharge air and gas in the sealable zone ( 2 ) to the outside of the bag then maintain the discharged state, or fill the sealable zone ( 2 ) with air and gas then maintain the charged state, and an air passage ( 3 ) is provided adjacent to the sealable zone ( 2 ) to communicating the sealable zone ( 2 ) to outside the bag to be able to allow air and gas pass through, the air passage ( 3 ) including an inner connecting part ( 3   a ) leading to the sealable zone ( 2 ) and an outer connecting part ( 3   b ) leading to the outside the bag, and allowing a flow of air in one direction while preventing in another direction when air and gas are discharged or filled as mentioned above, wherein
 at least bag sheets ( 11 ,  12 ) and a valve body sheet ( 31 ), being made of resin and thus flexible, and continuously supplied in the longitudinal direction, are used, wherein   the valve body sheet ( 31 ) is supplied after having been folded in two along a folding portion ( 31   c ) running in the longitudinal direction, and, in the double-folded state, its vertical dimension being a dimension in the widthwise direction is smaller than the bag sheets ( 11 ,  12 ), wherein   the manufacturing method comprising the steps of;   a process in which the valve body sheet ( 31 ) is disposed in a manner to be layered between the front bag sheet ( 11 ) and the rear bag sheet ( 12 ) in the location where the air passage ( 3 ) is formed;   a process in which a sealable zone defining seal ( 14 ) and a bottom seal ( 15 ), being along the longitudinal direction of the valve body sheet ( 31 ), and bag side seals ( 16 ) crossing in the widthwise direction of each of the sheets are provided;   a process in which the sheets ( 11 ,  12 ,  31 ) are cut in a manner to divide said bag side seals ( 16 ) in two.   
   
   
       12 . The structure of an air passage of a sealable bag according to Claim  2 , wherein a contacting surface ( 31   d ) of the valve body sheet ( 31 ) contacting to each bag sheet ( 11 ,  12 ), is provided with weak adhesion. 
   
   
       13 . The structure of an air passage of a sealable bag according to Claim  3 , wherein a contacting surface ( 31   d ) of the valve body sheet ( 31 ) contacting to each bag sheet ( 11 ,  12 ), is provided with weak adhesion. 
   
   
       14 . The sealable bag according to Claim  6  wherein;
 said sealable zone ( 2 ) is a space defined by a sealable zone defining seal ( 14 ) that extends laterally and is a portion where at least said bag sheets ( 11 ,  12 ) are adhered together, and defined by side seals ( 16 ) defining the left and right sides of the sealable bag ( 1 ), the space being above the sealable zone defining seal ( 14 );   said air passage ( 3 ) is a space defined by said sealable zone defining seal ( 14 ), said bag side seals ( 16 ), and a bottom seal ( 15 ) that is a portion where at least said beg sheets ( 11 ,  12 ) are adhered together and defines the lower end of the sealable bag ( 1 ), the space being below the sealable zone defining seal ( 14 ); wherein   the sealable zone dividing seal ( 14 ) is not provided in said inner connecting part ( 3   a );   the bottom seal ( 15 ) or the bag side seal ( 16 ) is not provided in said outer connecting part ( 3   b ); wherein   the inner connecting part ( 3   a ) and the outer connecting part ( 3   b ) are not provided in a position where the two vertically coincide with each other.   
   
   
       15 . The sealable bag according to Claim  7  wherein;
 said sealable zone ( 2 ) is a space defined by a sealable zone defining seal ( 14 ) that extends laterally and is a portion where at least said bag sheets ( 11 ,  12 ) are adhered together, and defined by side seals ( 16 ) defining the left and right sides of the sealable bag ( 1 ), the space being above the sealable zone defining seal ( 14 );   said air passage ( 3 ) is a space defined by said sealable zone defining seal ( 14 ), said bag side seals ( 16 ), and a bottom seal ( 15 ) that is a portion where at least said beg sheets ( 11 ,  12 ) are adhered together and defines the lower end of the sealable bag ( 1 ), the space being below the sealable zone defining seal ( 14 ); wherein   the sealable zone dividing seal ( 14 ) is not provided in said inner connecting part ( 3   a );   the bottom seal ( 15 ) or the bag side seal ( 16 ) is not provided in said outer connecting part ( 3   b ); wherein   the inner connecting part ( 3   a ) and the outer connecting part ( 3   b ) are not provided in a position where the two vertically coincide with each other.   
   
   
       16 . The sealable bag according Claim  6 , wherein a spacer member ( 32 ) is disposed between the front piece ( 31   a ) and the rear piece ( 31   b ) in a manner to be sandwiched by the pieces. 
   
   
       17 . The sealable bag according Claim  7 , wherein a spacer member ( 32 ) is disposed between the front piece ( 31   a ) and the rear piece ( 31   b ) in a manner to be sandwiched by the pieces. 
   
   
       18 . The sealable bag according Claim  8 , wherein a spacer member ( 32 ) is disposed between the front piece ( 31   a ) and the rear piece ( 31   b ) in a manner to be sandwiched by the pieces.