| 摘要 |
PROBLEM TO BE SOLVED: To provide a co-extruded composite film adapted to a composite film formed of a polyamide resin layer as a base material or particularly a retort packaging material having satisfactory pinholing resistance and a boiling deep drawing bottom material film having small curl occurrence. SOLUTION: The co-extruded composite film is obtained by laminating layers formed of a polypropylene resin layer (A), an ethylene-α-olefin copolymer resin layer (B) and a straight chain low-density polyethylene resin layer (C) on a base material of a polyamide resin layer, and laminating the layers in order of A, B and C from the base material side for a deep drawing bottom material and the layers in order of C, B and A from the base material side for a retort material. |
