Twin screw extruders

Details Twin screw extruders Twin screw extruders

1981-06-10

1983-11-15

Marcus, Stephen

Agitating

Rubber or heavy plastic working

Stirrer is through-pass screw conveyor

366149, B29B 110

Patent

active

044152680

ABSTRACT:
A temperable screw casing for a twin screw extruder for processing plastics comprises a supporting member and wear resistant liner disposed therein. The liner has a spectacle shaped bore accommodating both screws of the extruder. The supporting member, which engages around the liner, takes over the reinforcing function of the screw casing. Low technical manufacturing cost and satisfactory tempering of the screw casing is achieved by providing the liner with a circular external cross section, surrounded by a supporting member which has a circular internal recess. Axial tempering holes are provided in wedge shaped projections which extend into the spectacle shaped bore of the liner. Axial tempering holes are disposed opposite one another in the supporting member, at the sides of the spectacle shaped bore of the liner. These result in individual tempering systems, by which the liner and supporting member can be tempered independently.

REFERENCES:
patent: 3268949 (1966-08-01), Schmidt
patent: 3630689 (1971-12-01), Wheeler et al.
patent: 4118163 (1978-10-01), Lee
patent: 4127331 (1978-10-01), Herbert et al.
patent: 4176969 (1979-10-01), Wallace et al.

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