| 摘要 |
PROBLEM TO BE SOLVED: To provide a check valve structure of a bag body which is manufactured using as a small amount of a sheet material as possible, shows a high efficiency of the check valve in particular, is used for general purpose, is easy handled, and further is easily manufactured at a low cost with a simple manufacturing machine. SOLUTION: The bag body has front and back films each having a laminated sheet. At least some parts of both the front and back films are not laminated on each other to form a base film and an adherend film. The bag body is made by clamping the adherend films between the base films of the front and back films, and positioning the adhesive films of both the films. The check valve structure of the bag body shields the inside of the bag body from the outside by making the adhesive films tightly contact each other. COPYRIGHT: (C)2009,JPO&INPIT
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