Sterilizable packaging film includes a heat seal layer, wetted, comprising a mixture of polyethylene and a protective layer comprising a propylene-based polymer in a mixture of polyethylene

摘要

FIELD: process engineering.;SUBSTANCE: invention relates to polymer packing films, in particular to those films intended for packing foodstuffs to be sterilised together with package. Proposed method comprises filling heat-sealed multiplayer packing film with product, heating packed product to at least 220°C, and holding it at this temperature for at least an hour in the presence of steam at sterilisation pressure. Film comprises first cross-linked layer, outer heat-sealed layer in contact with product, and second cross-linked layer, outer heat-sealed layer. Said first layer in contact with product comprises mix of homogeneous copolymer of ethylene and alpha-olefine and/or copolymer of propylene and ethylene with malting temperature varying from 110°C to 150°C and containing up to 4.9% by weight of monomer ethylene links. Said second, outer, layer comprises mix of isotactic propylene-based polymer and homogeneous copolymer of ethylene and alpha-olefines C_4-8 with density varying from 0.86 g/cm³ to 0.91 g/cm³.;EFFECT: film easily sealed lapped, not sticking to walls of autoclave.;21 cl, 1 dwg, 2 tbl, 7 ex