Biaxially stretched five-layer film and method for manufacture t

Details Biaxially stretched five-layer film and method for manufacture t Biaxially stretched five-layer film and method for manufacture t

1978-09-20

1980-10-07

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Layered, stratified traversely of length, or multiphase...

264209, 2642101, 4251331, B32B 3130

Patent

active

042268222

ABSTRACT:
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.

REFERENCES:
patent: 3524795 (1970-08-01), Peterson
patent: 3645822 (1972-02-01), Widiger et al.
patent: 3707590 (1972-12-01), Wiggins et al.
patent: 3856448 (1974-12-01), Iijima et al.
patent: 3908070 (1975-09-01), Marzolf
patent: 3932692 (1976-01-01), Hirata et al.
patent: 3953557 (1976-04-01), Brax et al.
patent: 4008352 (1977-02-01), Dawes et al.
patent: 4134952 (1979-01-01), Yoshikawa et al.

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