| 摘要 |
PURPOSE:To widen an appropriate temperature range for heat shrinking and packaging and improve tear propagation strength, by a method wherein the title film is constituted of both outside layers of specific crystalline polypropylene resin and an intermediate layer comprised respectively of specific straight chain low density polyethylene, and a copolymer of propylene and alpha-olefin. CONSTITUTION:This laminated heat-shrinkable film is constituted so that both the outside layers are comprised of polypropylene resin whose melting point is 135-150 deg.C, the intermediate layer is comprised of a resinous composition wherein straight chain low-density polyethylene whose density is 0.890-0.910g/cm<3> and a Vicat softening point is 60-80 deg.C, and a copolymer of propylene and 2-8C alpha-olefin whose Vicat softening point is 70-110 deg.C are mixed up with each other in a range of 8:2-2:8, and a thickness of the said intermediate layer is 30-80% of the whole thickness. |
