| 摘要 |
PROBLEM TO BE SOLVED: To provide an article packaging method which can prevent foreign matters from entering, has easy-opening property such that a square-bottomed bag can be opened with its form kept and does not impair such convenience that the square-bottomed bag can be repeatedly opened/closed by a binding tool or the like, and a co-extrusion laminate film suitable for manufacturing the square-bottomed bag for use in the packaging method. SOLUTION: The co-extrusion laminate film has a heat-seal resin layer (A) containing a block copolymer (a) consisting of an ethylene-propylene copolymer block and an ethylene-propylene copolymer block having a larger content of an ethylene-originated component than the former block, an intermediate resin layer (B) containing a propylene-based resin with a start-to-heat-seal temperature higher than that of the block copolymer (a), and a surface resin layer (C) with a thickness of 0.5 to 5μm containing an ethylene-based resin. The packaging method comprises a step of heat-sealing an opening of a square-bottomed bag made of the film and filled with an article under easy-operable heating conditions to provide an easy-openable square-bottomed package. COPYRIGHT: (C)2003,JPO |
