| 摘要 |
PURPOSE:To obtain a heat-shrinkable film excellent in adaptability to packaging machine by using in an intermediate layer the resin having a low melt index, a high amount of total heat of melting and an endothermic area ratio not below the melting point being outside a certain range and a specific resin in an inner and an outer layer. CONSTITUTION:An intermediate layer of the laminated film comprises a composition consisting mainly of a linear low-density polyethylene which has a density of 0.910-0.930g/cm<3> and a melt index of 0.1-0.8g/10 minutes and in which the total amount of heat of melting is not less than 135mJ/mg in a melting curve obtained when the film temp. rises at a temp. rise rate of 10 deg.C/minute after the film temp. drops to 20 deg.C at a temp. fall rate of 10 deg.C/minute following the maintenance of the film at 190 deg.C for 30 minutes and the endothermic area not below the main peak temp. (melting point) comprises at least 12% of the total endothermic area. This intermediate layer is interposed between an inner and an outer layer, each comprising a composition consisting mainly of a linear low density polyethylene having so a high melt index as 0.8-5.0 g/10 minutes as compared with that of the intermediate layer, thereby obtaining a heat- shrinkable laminated film. |
