Method and apparatus for the extrusion of foamable thermoplastic

Details Method and apparatus for the extrusion of foamable thermoplastic Method and apparatus for the extrusion of foamable thermoplastic

1975-04-24

1976-05-04

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 455, 264 461, 264 88, 264177R, 425325, B29D 2700

Patent

active

039549291

ABSTRACT:
Plastic foam is extruded into and from a channel where it expands from an extrusion orifice. A pressure controlled gas pocket provides support for the foaming material generally adjacent the extrusion die. The arrangement permits extrusion of foam having widely varying characteristics with a single apparatus.

REFERENCES:
patent: 2537977 (1951-01-01), Dulmage
patent: 2620515 (1952-12-01), Olson
patent: 2774991 (1956-12-01), McCurdy et al.
patent: 3194854 (1965-07-01), Smith
patent: 3219733 (1965-11-01), Harris et al.
patent: 3413388 (1968-11-01), Lux et al.
patent: 3431163 (1969-03-01), Gilbert
patent: 3466705 (1969-09-01), Richie
patent: 3647329 (1972-03-01), Reifenhauser et al.
patent: 3764642 (1973-10-01), Boutillier

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