| 摘要 |
PURPOSE: A check valve for injecting gas into air sac is provided to use in injecting air into a gas tube or discharging air therefrom by a straw or the like. Also, the check valve is provided to simplify a structure thereof, to be reused repeatedly, and to be automatically and completely sealed. CONSTITUTION: A check valve for injecting gas into a gas tube is provided in an upper and lower film substrates(5, 6) which are piled up one on another and has a straight air passage of which front and rearward periphery portions(1 and 2) are opened and left and right periphery portions are fused each other. The upper and lower film substrates(5, 6) are made of synthetic resin which is fusible material as same as that of an air sac, such as a polyethylene, a polypropylene, or the like. The check valve is constituted by adhering hard films(10, 20) made of synthetic resin material having a good elastic restoration force such as PET(polyethylene terephthalate) and the like on the front periphery portion(1) side with adhesive agent(7) and also adhering soft films(10', 20') made of any one material selected from materials having a good flexibility and adhesive capability such as soft PVC(polyvinyl chloride), latex rubber, silicon rubber, or the like on the rearward periphery portion(2) side with adhesive agent(7). According to the check valve, since an insertion and removal of a straw is made easily, failure rate is low even in repeat uses. Also, since the air passage is formed in a straight configuration and, thus, bottleneck portion is not existed, injection of air into an air sac or discharge of air therefrom is made quickly and conveniently.
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