METHOD FOR MANUFACTURING A LABIN-STRAINED LAMINATE FILM OF SEVERAL LAYERS

摘要

A biaxially stretched five-layer film suitable for packaging fatty foodstuffs of irregular shape is disclosed, which has a first (outermost) layer made of an ionomer, an olefin homopolymer, an olefin copolymer or a mixture of the olefin homopolymer with the olefin copolymer, a second layer of an ethylene copolymer, a third layer of a vinylidene copolymer, a fourth layer of an ethylene copolymer and a fifth (innermost) layer of an ionomer. This film is obtained by preparing a laminate consisting of the layers of respective resins mentioned above by means of a specific die designed for multi-layer tubular molding and biaxially stretching the laminate under specific conditions.