| 摘要 |
A plastic bag is provided in which the layers of panel portion (2a, 2b) are heat sealed with the layers of bottom gusset portion (18a, 18b) along the bottom edges (10) respectively so that the bottom edges are connected with each other by the.bottom gusset portion. The layers of first and second auxiliary gusset portions (22a, 24a) are heat sealed with the layers of first and second side gusset portions (12a, 12b, 14a, 14b) along the bottom edges respectively so that the first and second side gusset portions are connected with the bottom gusset portion by the first and second auxiliary gusset portions. In addition, the layers of panel portion are heat sealed with the layers of first and second side gusset portions along the first and second side edges (6, 8) respectively so that the first side edges are connected with each other by the first side gusset portion, the second side edges being connected with each other by the second side gusset portion. The bottom gusset portion and the first and second auxiliary gusset portions invade the ranges of seal width of the layers of panel portion with the layers of first and second side gusset portions. <IMAGE> |
