Coextrusion apparatus and process

Details Coextrusion apparatus and process Coextrusion apparatus and process

1987-06-05

1988-12-06

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

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

264 407, 4251311, 4251335, 425462, B29C 4770

Patent

active

047895136

ABSTRACT:
The present invention provides a novel coextrusion apparatus including, in a preferred embodiment, a die within a feedblock. The apparatus includes edge seam-forming channels, which provide a core layer sandwiched within adjacent layers having integrally seamed edges. Also provided in a unique process for sandwiching a core stream within adjacent layers.

REFERENCES:
patent: 3315306 (1967-04-01), Ladner et al.
patent: 3397428 (1968-08-01), Donald
patent: 3479425 (1969-11-01), Lefevre et al.
patent: 3511903 (1970-05-01), Glass et al.
patent: 3761211 (1973-09-01), Parkinson
patent: 3860372 (1975-01-01), Newman, Jr.
patent: 4197069 (1980-04-01), Cloeren
patent: 4533308 (1985-08-01), Cloeren
patent: 4533510 (1985-08-01), Nissel
Photograph of 7-Layer, Dual Plane Coextrusion Feedback Having Vane Blades with Undercut Wall, of Cloeren Company.

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