Degassing extruder
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United States of America Patent
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Jun 30, 1992
Grant Date -
N/A
app pub date -
Jul 3, 1991
filing date -
Jul 7, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of degassing a molten mass of thermoplastic, plastics material containing residual monomers and a twin-screw extruder capable of effecting such degassing. A molten mass of plastics material and a stripping agent are intermixed at a pressure which prevents the stripping agent from changing from liquid to gas at the temperature of the molten mass. The pressure necessary is achieved by the use of a pressure restrictor, which is yoke-shaped and is connected to the extruder housing in a force-fitting manner using centering means but which effectively blocks the processing chamber of the extruder downstream thereof to the molten material with the exception of a maximum of two throughbores for such material.
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