Structure of fluid container and method and apparatus for producing the fluid container

Abstract

A fluid container for packing a product includes a check valve for each container member. A bonding structure of check-valves to a fluid container and a production method and apparatus of fluid container are disclosed in detail where the check valve is capable of reliably keeping the expansion of the fluid container without any fluid leakage after inflating the fluid container. As the check-valve is bonded to only one of thermoplastic container films, both films of the check-valve are fixed to one of the container films, thereby preventing the reverse flow by tightly closing the check valve. The manufacturing apparatus includes an up-down roller controller which precisely positions the films to form the check valve. The manufacturing apparatus can produce the fluid container with high reliability by having a belt conveyor specially designed for cooling down the heat sealed films before separating from the belt conveyor without damage.

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       13 . A manufacturing apparatus for producing a fluid container for packing a product by sealingly containing a fluid therein, comprising: 
 means for feeding films which feeds a first container film, first and second check valve films and a second container film, wherein the first and second check valve films are sandwiched between the first and second container films;    a feed sensor for detecting a position of a mark printed on either the first or second check valve film to feed the films;    an up-down roller controller for adjusting positions of the first container film and the first and second check valve films;    means for bonding the first container film and the first and second check valve films, thereby creating check valves; and    means for bonding the first container film, the first and second container films and the second container film, thereby creating a plurality of container members and inlet portions of the check valves;    wherein the up-down roller controller adjusts the position of the check valve films by detecting the mark for determining the position of check valve.    
   
   
       14 . A manufacturing apparatus to produce a fluid container as defined in  claim 13 , wherein the up-down roller controller includes a control sensor and up-down rollers, wherein the control sensor detects the mark and control a feed length of the first container film and the first and second check valve films such that the check valve is formed at a predetermined position of the fluid container by moving the up-down rollers in perpendicular to a feeding direction of the films.  
   
   
       15 . A manufacturing apparatus to produce a fluid container as defined in  claim 13 , wherein said means for bonding the first container film, the first and second check valve films and the second container film, comprising: 
 means for bonding right-left bonding portions of the first and second container films; and    means for bonding upper-lower bonding portions of the first and second container films.    
   
   
       16 . A manufacturing apparatus to produce a fluid container as defined in  claim 15 , wherein the means for forming right-left bonding portions, comprising: 
 an upper stamping die for forming the right-left bonding portions at a predetermined temperature by pressing down the upper stamping die on the first container film;    a lower belt conveyer having a rubber belt which is located just under the upper stamping die;    wherein the first container film, the first and second check valve films and the second container film are sandwiched between the upper stamping die and the lower belt conveyer; and    wherein the belt sticks the second container film and moves at the same speed as a feeding speed of the second container film.    
   
   
       17 . A manufacturing apparatus to produce a fluid container as defined in  claim 13 , wherein the feed sensor includes: 
 a light emitting source; and    a photo receiver which receives a light energy passed through the check valve film and produces a signal corresponding to the light energy.    
   
   
       18 . A manufacturing apparatus to produce a fluid container as defined in  claim 17 , wherein the means for feeding films includes drive rollers which feed the check valve films and container films with a length of one fluid container with use of the signal from the photo receiver of the feed sensor.  
   
   
       19 . A manufacturing apparatus to produce a fluid container as defined in  claim 13 , wherein the means for forming upper-lower bonding portions, comprising: 
 an upper stamping die for forming the upper-lower bonding portions at a predetermined temperature by pressing down the upper stamping die on the first container film; and    an lower stamping die for forming the upper-lower bonding portions at a predetermined temperature by pressing up the lower stamping die on the second container film.    
   
   
       20 . A manufacturing apparatus to produce a fluid container as defined in  claim 13 , wherein the means for bonding the first container film and the first and second check valve films, includes 
 an upper stamping die for forming a fixing seal portions at a predetermined temperature by pressing down the upper stamping die on the first container film; and    an lower stamping die for forming the fixing seal portions at a predetermined temperature by pressing up the lower stamping die on the second check valve film,    wherein the first container film and the first and second check valve films are sandwiched between the upper and lower stamping dies forming the fixing seal portions.