Method of forming a coextruded foam composite

Details Method of forming a coextruded foam composite Method of forming a coextruded foam composite

1990-09-05

1993-06-01

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 53, 264 54, B29C 6722

Patent

active

052156915

ABSTRACT:
A method for preparing composite foam articles by the coextrusion of at least two interdigitated layers in abutting relationship to each other, wherein at least one layer of composite article comprises at least one expanded thermoplastic resinous material. At least one physical expansion agent is incorporated into at least one of the layers under a pressure sufficient to keep the expansion agent quiescent and the individual melt streams are combined and interdigitated into a composite layered stream. The composite layered stream is expressed while the operating pressures and temperatures of individual melt streams are controlled to provide a coextrusion product having a stable foam structure.

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patent: 4221624 (1980-09-01), Eslinger et al.
patent: 4657811 (1987-04-01), Boyd et al.
patent: 4746477 (1988-05-01), Wecker et al.
patent: 4828772 (1989-05-01), Lopatin et al.
patent: 4889669 (1989-12-01), Suzuki
patent: 5049327 (1991-09-01), Hara et al.

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