| 摘要 |
PROBLEM TO BE SOLVED: To provide a packaging bag which is free from a crack formation due to bending that is a drawback of a packaging bag using a film lamination. SOLUTION: The packaging bag (20) is mainly made of a composite member (10), which is composed of a plastic film base material (11), at least one surface of which has a vapor-deposited thin layer (12) made of an inorganic oxide, a paper member (13) laid on one surface of the base material (11), and a heat sealable plastic film (14) layered on the other surface of the base material (11). The paper member (13) is made of a hot water resistant paper having a weight per square meter of 60 to 180 g/m<SP>2</SP>and a density of 0.86 g/cm<SP>3</SP>, and is equivalent to 50% or more of the packaging bag (20) in weight percentage. The hot water resistant paper is preferably a paper impregnated with a polyisocyanate resin, and the packaging bag is preferably a standing pouch or a gusset pouch. COPYRIGHT: (C)2005,JPO&NCIPI
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