Method for forming a laminated film containing different polymer

Details Method for forming a laminated film containing different polymer Method for forming a laminated film containing different polymer

1983-09-14

1985-06-11

Woo, Jay H.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

15624413, 15624414, B29C 1900

Patent

active

045226750

ABSTRACT:
Disclosed is a method and apparatus for separately coextruding dissimilar polymer melts through a die, expanding the polymer melts to different degrees and then contacting and adhering the polymer melts together at or near the frost line to produce a laminated film where the various polymer layers thereof can be optimally molecularly oriented in the completed film. The invention is particularly useful in producing a film where one of the extruded layers therein is a polymer foam.

REFERENCES:
patent: 3853661 (1974-12-01), Sudo
patent: 3926706 (1975-12-01), Reifenhauser et al.
patent: 3957566 (1976-05-01), Rahlfs
patent: 4101050 (1978-07-01), Buckler et al.
patent: 4254175 (1981-03-01), Kubat et al.
patent: 4357191 (1982-11-01), Bullard et al.

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