| 摘要 |
<P>PROBLEM TO BE SOLVED: To facilitate adjustment of an opening amount in a packaging bag where a wide opening can be formed. <P>SOLUTION: The gusset type packaging bag includes a front surface sheet 1, a rear surface sheet 2, and side sheets 3 and 4, and is obtained by thermally melt-bonding the four sides of the front surface sheet 1 at peripheral edge seal parts 11 including both-edge sealing parts 5 and 6 and both-edge sealing parts 9 and 10. An extending part 13 extending more outside than one edge seal part 9 on the same side is formed on one edge part of the front surface sheet 1. The one edge seal part 9 and an area from the edge of the extending part 13 side of the both-edge sealing parts 9 and 10 to a longitudinal middle part are made a low sealing strength part where a sealing strength is lower than that of the other area of the peripheral seal part 11 that is a strong seal part, and which can be peeled. <P>COPYRIGHT: (C)2012,JPO&INPIT |
