Degassing extruder

Details Degassing extruder Degassing extruder

1991-07-03

1992-06-30

Thurlow, Jeffery

Plastic article or earthenware shaping or treating: apparatus

With separate and distinct upstream agitating or kneading means

With separate and distinct gas withdrawal chamber

159 22, 159 23, 264101, 425204, 425208, 425192R, 366 75, B29C 4776

Patent

active

051258242

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.

REFERENCES:
patent: 3391232 (1968-07-01), Jackson
patent: 3501807 (1970-03-01), Selbach
patent: 3963558 (1976-06-01), Skidmore
patent: 4029300 (1977-06-01), Morishima et al.
patent: 4136968 (1979-01-01), Todd

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