Method for extruding a thermoplastic plastics material foam

Details Method for extruding a thermoplastic plastics material foam Method for extruding a thermoplastic plastics material foam

1990-09-06

1992-03-17

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 51, 264 53, 26421121, 264DIG5, B29C 6720

Patent

active

050966383

ABSTRACT:
A method of producing a foamed thermoplastic plastics material wherein the plastics material is mixed with a pulverulent nucleating agent and is then fused in an extrusion device. A gaseous nucleating agent, generally nitrogen, is then injected into the fused mixture in an amount of from about 0.1% to 0.5% by weight. Thereafter, a liquid propellant is injected into the fused mixture in an amount of from 0.5% to 6.0%, preferably 0.5% to 5.0%, by weight. The mixture is then conveyed to an extrusion head and extruder whereupon foaming occurs.

REFERENCES:
patent: 4424287 (1984-01-01), Johnson et al.
patent: 4438224 (1984-03-01), Suh et al.
patent: 4470938 (1984-09-01), Johnson
patent: 4548776 (1985-10-01), Holdredge, Jr.
patent: 4636527 (1987-01-01), Suh et al.
patent: 4753762 (1988-01-01), Li et al.

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