| 摘要 |
PROBLEM TO BE SOLVED: To make a remarkable improvement of a seal opening end strength by a quite simple structure without reducing the function of acting as a packaging bag and also without using any additional member. SOLUTION: A packaging bag of a plastic film is made into a bag by applying seal at both sides of a laminated plastic film 1. Further, this packaging bag is provided with curved recesses 3 positioned at both sides of an opening edge 5 and spaced apart from a seal opening end 2. COPYRIGHT: (C)2005,JPO&NCIPI
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