| 摘要 |
PURPOSE:To obtain the titled film simply and inexpensively which is of low shrinkage, of appropriate elongation and suitable for casings to pack meat by a method wherein a coextruded tubular laminated film is blow-oriented under a specific condition. CONSTITUTION:A coextruded tubular laminated film 1 is introduced to a dry hot tube body 7 to keep a dry hot state of 80-300 deg.C and the length is oriented by 1.1-1.3 times and the width is by 1.1-1.5 times by sealing the air between nip rolls 6, 6 and nip rolls 8, 8. This tubular laminated film is cooled by the cooling water in a diameter controlling ring 9 immediately behind the start point A of orientation. The laminated film 1 compromises a thermoplastic resin layer 2 and a polyolefin resin layer 3 which are excellent in oxygen insulation and a thermoplastic layer 4 having adhesiveness to both resin layers. |
