| 摘要 |
PROBLEM TO BE SOLVED: To provide a film having low moisture permeability capable of ensuring rigidity even if the thickness is made thin. SOLUTION: The sealant layer of the film for packaging is formed by using a coextruded film which is composed of three layers of an intermediate layer composed of a linear low-density polyethylene (C<SB>6</SB>LLDPE) where an ethylene and alpha olefin having six carbons are co-polymerized or a high-density polyethylene (HDPE), a front surface layer, and a back surface layer, which are laminated on both sides of the intermediate layer, and composed of a linear low-density polyethylene (C<SB>4</SB>LLDPE) layer where the ethylene and the alpha olefin having four carbons are co-polymerized, and the thickness ratio of the three layers of the front surface layer, the intermediate layer, and the back surface layer is within the range of 1:1:1 to 1:2:1 when the thickness of the front surface layer and the back surface layer is 1. COPYRIGHT: (C)2009,JPO&INPIT |
