| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a laminated plastic film having an enough strength, excellent in gas permeability and easily unsealing properties, and having good appearance, and an apparatus for manufacturing it. <P>SOLUTION: The gas permeable laminated plastic film 1 consists of a base film layer 1a and a sealant layer 1b, and in this gas permeable laminated plastic film 1, a first micro-porous hole group 2 formed in the sealant layer 1b side covers the whole face of the sealant layer 1b and has a depth comparable as that of the sealant layer 1b, and a second micro-porous hole group 3 formed on the base film layer 1a side partly and covers the base film layer 1a in a strip from and has a depth comparable as that of the base film layer 1a, and in regions where the first and second micro-porous hole groups 2, 3 overlap, the micro-porous holes penetrate through the laminated plastic film 1, and thereby, the gas permeability is provided. <P>COPYRIGHT: (C)2012,JPO&INPIT |
