THERMOPLASTIC MULTILAYER PACKAGING FILM HAVING HIGH SHRINKAGE ENERGY/HIGH ELASTICITY MODULUS AND BAG MADE OF THE FILM

摘要

PURPOSE: To prevent unseemly folding by adjusting the shrinkage energy and modulus of elasticity of a whole multi-layer barrier film comprising a thermoplastic heat-sealing layer, an inside layer of a polyamide or a polyester, a barrier layer, and a thermoplastic polymer layer by the shrinkage energy and modulus of elasticity of the inside layer. CONSTITUTION: A multi-layer film comprises an inside layer comprising a polyamide or a polyester, a thermoplastic heat-sealing layer arranged on one surface of the inside layer, a barrier layer of a barrier material selected from the group consisting of vinylidene chloride copolymers and saponified ethylene-vinyl acetate copolymers which is arranged on a surface opposite to the thermoplastic heat- sealing layer of the inside layer, and another thermoplastic polymer layer laid on a surface opposite to the inside layer of the barrier layer. The shrinkage energy and modulus of elasticity of the entire film can be adjusted by the shrinkage energy and modulus of elasticity of the inside layer.