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

1990-06-21

1991-11-12

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

26421123, 264DIG5, B29C 4700

Patent

active

050645870

ABSTRACT:
A method of extruding a foamed thermoplastic plastics material wherein the thermoplastic plastics material, together with a pore regulating agent, is introduced into an extruder and is fused. Gaseous nitrogen, in an amount of 0.2% to 0.5% by weight, and an incompletely halo-substituted hydrocarbon, in an amount of from 0.5% to 2% by weight, are sequentially injected into the fused mixture. The injected material then enters an extrusion head in which the mixture is maintained at a pressure in excess of 55 bar and the temperature thereof is maintained above a temperature pre-determined in dependence upon the nature of the plastics material. The material foams as it leaves the extrusion head.

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 (1988-06-01), Li et al.

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