| 摘要 |
PROBLEM TO BE SOLVED: To provide a check valve of favorable usability that is usable for filling an air bag, etc. SOLUTION: This check valve 1 comprises a first and a second films 11 and 12 of the same strip form, a third film 13 of a rectangular form having shorter sides of the same length as the shorter sides of the first film 11, and a fourth film 14 of a rectangular form having the same length of shorter sides as the shorter sides of the second film 12. The fourth film 14 and the second film 12 are put to face each other, with width W of the fourth film 14 coinciding with width W of the second film 12. The fourth film 14 is provided to coincide with the form of the third film 13 through the second film 12 and the first film 11. The fourth film 14 and the second film 12 have a fifth end weld part welded along one longer side of their rectangular form, and the fourth film 14 and the second film 12 have a sixth end weld part welded along the other longer side. COPYRIGHT: (C)2005,JPO&NCIPI
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