| 摘要 |
PURPOSE:To provide a stretched film for food packing excellent in transparency, glossiness, see-through, elongation characteristics, packing machine aptitude and workability other than deformation recovery and safe from the aspect of waste disposal and food sanitation. CONSTITUTION:A stretched film for food packing is a laminated film composed of a three-layered structure and each of both surface layers (A) of the film are composed of a specific ethylenic copolymer or a compsn. containing the same and the center layer (B) of the film is composed of a compsn. selected from crystalline polypropylene (B1), crystalline polybutene-1(B2) and the surface layer (A) (B3) and respective mixing wt. ratios are 0.20<=(B1+B2)/(B1+B2+B 3)<=0.98, 0.1<=(B1)/(B1+B2+B3)<=0.49, 0.1<=(B2)/(B1+B2+B3)<=0.49 and 0.02<=(B3)/(B1+B2+B3)<=0.80. The shrinkage factor of the laminated film after inflation molding is 20% or less at.90 deg.C. |
