Multiple ply coextrusion

Details Multiple ply coextrusion Multiple ply coextrusion

1981-01-05

1982-10-12

Epstein, Henry F.

Envelopes, wrappers, and paperboard boxes

Envelope

Series

15624425, 206604, 264171, 428136, 428 43, B29F 300, B65D 6528, B65D 2710

Patent

active

043534988

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: 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

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