| 摘要 |
PROBLEM TO BE SOLVED: To provide a useful and beneficial synthetic resin-based packaging bag with an opening/closing tool which has various effects including a high level of airtightness in the closed state of the opening/closing tool, and so on.SOLUTION: Recess/projection shaped parts 18-21 are formed in both side seals 14 and 15 of a bag body 11. Inflated parts after the formation of the recess/projection shaped parts are reduced in volume as compared with the inflated parts before the formation of the recess/projection shaped parts. Within the bag body 11, in the regions of end parts 31 and 32 of opening/closing tools which are in contact with the inner edge part side of each of the side seals 14 and 15, there are formed support layers 26a-26c for supporting the end parts of the opening/closing tools. The recess/projection shaped parts 18-21 and the support layers 26a-26c form a seal structure for preventing leakage between each end part of the opening/closing tools within the bag body 11 and the inner surface of a bag front film, and form a seal structure for preventing leakage between each end part of the opening/closing tools within the bag body and the inner surface of a bag back film. Airtightness between each end part of the opening/closing tools in a closed state and the inner surface of the bag body is maintained via the recess/projection shaped parts 18-21 and the support layers 26a-26c.SELECTED DRAWING: Figure 5 |
