Coextrusion method and apparatus

Details Coextrusion method and apparatus Coextrusion method and apparatus

1982-07-26

1984-02-21

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

15624414, 15624418, 15624425, 156252, 156257, 156500, 156510, B29D 700, B32B 3118

Patent

active

044328265

ABSTRACT:
A coextruded film having an integral tear path is provided such that the tear path has a thickness that is smaller than the overall thickness of the coextruded film, said product being formed by a method and on an apparatus that introduces an elongated void in at least one of the extrudates before being combined with other extrudates into the coextruded film, said elongated void accounting for the reduced thickness of the tear path.

REFERENCES:
patent: 3186628 (1965-06-01), Rohde
patent: 3368740 (1968-02-01), Rohde
patent: 3369267 (1968-02-01), Friedland et al.
patent: 3523859 (1970-08-01), Komp
patent: 3533550 (1970-10-01), Benzon-Petersen
patent: 3535409 (1970-10-01), Rohde
patent: 3640381 (1972-02-01), Kanada et al.
patent: 3790744 (1974-02-01), Bowen
patent: 3909582 (1975-09-01), Bowen
patent: 3939972 (1976-02-01), Mayworm
patent: 4379806 (1983-04-01), Korpman

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