Method and apparatus for extrusion of thermoplastic foam
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United States of America Patent
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-
Sep 11, 1984
Grant Date -
N/A
app pub date -
Aug 27, 1982
filing date -
Aug 27, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for continually metering a gaseous blowing agent in an accurate and precise manner into a molten resin charge, such as polystyrene. This is accomplished by a free piston-cylinder combination which is actuated by the gas blowing agent and which continually meters discrete uniform volumetric charges of the gaseous agent into the molten resin. The blowing agent is uniformly distributed throughout the resin charge and extruded into a region of lower pressure to yield a foamed structure.
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