Thermal ductile, heat shrinkable multi layer film for the production of thermal formed heat shrinkable hollow packing, comprises carrier, adhesion mediator, oxygen-close barrier and seal layers

摘要

The mediator layer has a thickness of 20 mu m and is based on ethyl vinyl acetate copolymer having vinyl acetate content of 3-18 mol%. The carrier layer has a thickness of 5-100 mu m and is based on polyethylene, ethyl copolymer, polypropylene and propylene copolymer. The seal layer has a thickness of 5-25 mu m and is based on polyolefins, olefin copolymers, polyalkylmethacrylate and/or alkylmethacrylate copolymers. A heat shrinkage has a stretching ratio of 1:5-1:3. The adjacent layer has a thickness of 50-250 mu m. The barrier layer has a thickness of 5-50 mu m and is based on polyvinylidene chloride copolymer and ethyl/vinylalkohol copolymer. Independent claims are included for: (1) a method of producing a thermal formed heat shrinkable hollow packing; (2) the production of a packing; (3) a packing machine; (4) the production of a packing using heat shrinkable multilayer film; and (5) sealing an upper foil on a hollow packing.