Method and apparatus for extrusion of thermoplastic foam

Details Method and apparatus for extrusion of thermoplastic foam Method and apparatus for extrusion of thermoplastic foam

1982-08-27

1984-09-11

Anderson, Philip E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

261 82, 264DIG5, 425 4C, B29D 2700

Patent

active

044709382

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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patent: 4043715 (1977-08-01), Hendry
patent: 4211523 (1980-07-01), Hunerberg
patent: 4381272 (1983-04-01), Ehritt

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