| 摘要 |
PURPOSE:To prevent a packing bag from being damaged even if a heavy photosensitive material is packed by using a laminated film comprising a specified multilayered co-extruded film, a layer of an expanded resin sheet, and a layer of flexible sheet. CONSTITUTION:A packing bag comprises a laminated multilayered co-extruded film 3, a layer 4 of an expanded resin sheet, and a layer 5a of flexible sheet. The layer 3 is formed as the innermost layer contacting with a photosensitive material having >=200mum total thickness and contg. 0.5-50g/m<2> light shielding material. The layer 3 consists of a high density polyethylene layer 1a having 0.951-0.980g/cm<3> density, 0.1-3.0g/10min melt index, and 20-80mum thickness, and a layer 2 of low density polyethylene obtd. by copolymerizing ethylene with >=6C alpha-olefin and having 0.870-0.931g/cm<3> density, 0.5-5.0g/10min melt index, and 15-80mum thickness. The layer 4 has <=0.3g/cm<3> density and the thickness is regulated to 0.1-2mm. These layers 3, 4, 5a are laminated with the adhesive layers 6 interposed therebetween. |
