Method and apparatus for preparing thermoplastic resin foam
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United States of America Patent
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-
Jun 12, 1984
Grant Date -
N/A
app pub date -
May 17, 1982
filing date -
May 18, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for preparing a substantially uniform thermoplastic foam extruded from an extruder, the molten thermoplastic resin having uniformly distributed therein a foaming agent. A cooling-mixer continuously receives the extruded mass of resin and foaming agent from the extruder and intimately mixes and substantially cools the mass. A substantially adiabatic zigzag mixer is connected to the cooling-mixer and divides the mass into a plurality of separate streams which are at least partially separated and recombined. A die is connected to the zigzag mixer and extrudes the uniformly cooled mass into a lower pressure zone to produce a substantially uniform thermoplastic foam.
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