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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       7 . A method of producing a fluid container for packing a product by sealingly containing a fluid therein, comprising the following steps of: 
 superposing first and second check valve films on a first container film;    bonding the first and second check valve films to the first container film for creating a plurality of check valves;    superposing a second container film on the first container film while sandwiching the check valves therebetween; and    bonding the first container film, the first and second check valve films and the second container film, thereby creating a plurality of container members where the check valve is positioned at each input of the container member.    
   
   
       8 . A method of producing a fluid container as defined in  claim 7 , wherein said step of creating the check valves includes a step of positioning the first and second check valve films by detecting positions of marks printed on the first or second check valve film.  
   
   
       9 . A method of producing a fluid container as defined in  claim 7 , wherein the check valve includes: 
 an inlet portion which introduces the fluid into the check valve;    a pair of narrow down portions creating a narrow down passage connected to the inlet portion;    an extended portion which diverts the fluid coming through the narrow down passage; and    a plurality of outlet portions which introduce the fluid from the extended portion to the container member.    
   
   
       10 . A method of producing a fluid container as defined in  claim 7 , wherein said step of bonding the first container film, the first and second check valve films and the second container film, includes the steps of: 
 forming right-left bonding portions, thereby creating a part of the container members; and    forming upper-lower bonding portions, thereby creating the rest of the container members and inlet portions of the check valves.    
   
   
       11 . A method of producing a fluid container as defined in  claim 8 , wherein said marks are color marks printed in advance on either the first check valve film or the second check valve film.  
   
   
       12 . A method of producing a fluid container as defined in  claim 8 , wherein said marks are printed with use of heat-resist paint.  
   
   
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