| 摘要 |
PROBLEM TO BE SOLVED: To provide a self-supporting bag having a double wall of an outer side film and an inner side film, having a content storage part surrounded by the inner side film, capable of filling gas between the double wall, having a stable self-supporting property and in which the content storage part is big.SOLUTION: A lower end of an outer side film 1 which is folded into two is folded inside, and two outer side film moutain fold parts 3 and one outer side film valley fold part in the middle of them are provided. A lower end of an inner side film 2 which is folded into two is folded inside, and two inner side film mountain fold parts and one inner side film valley fold part in the middle of them are provided. The inner side film 2 is inserted into the inside of the outer side film 1. On both sides where the outer side film 1 and the inner side film 2 are overlapped, a side sealing part is formed which is sealed in four layers. The mountain fold parts of the inner side film are above the outer side film mountain fold parts 3, and below the outer side film valley fold part. |
