Degassing extruder

Plastic article or earthenware shaping or treating: apparatus – With separate and distinct upstream agitating or kneading means – With separate and distinct gas withdrawal chamber

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Details

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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