| 摘要 |
PROBLEM TO BE SOLVED: To provide a packaging bag which is composed of a laminate film containing a base material layer having proper stiffness such as an aluminum layer, and achieves improved safety. SOLUTION: In the packaging bag made by bonding the opposite circumferential edges of a film forming a front surface 4 and a film forming a back surface 5 with a heat seal layer, the edge of the corner 12 is formed into an arcuate shape so that a resin forming the heat seal layer is protruded from each film. COPYRIGHT: (C)2010,JPO&INPIT |
