Twin-screw extruder

Details Twin-screw extruder Twin-screw extruder

1998-09-02

2000-05-09

Cooley, Charles E.

Agitating

Rubber or heavy plastic working

Stirrer is through-pass screw conveyor

366 88, B29B 746

Patent

active

060594403

ABSTRACT:
A multi-screw extruder consists of contra-rotating screws (20) inserted in a housing, whose flights (1) form intermeshing crests (2) and roots (3), and which have at least two axial sections (21, 22, 23) of flights each differing in number and pitch. To improve the manufacturing conditions, and to achieve uniform wear conditions over the screw length, adjacent axial sections (21, 22, 23) of a screw (20) verge into each other within an axial transition zone (24) free from annular grooves, where all roots (3) extend through the transition zone (24) while making turns (.alpha.) and forming ramifications or combinations (V), and at least one of the crests (2) begins or ends in the transition zone (24).

REFERENCES:
patent: 3667733 (1972-06-01), Fritsch
patent: 3687423 (1972-08-01), Koch et al.
patent: 4140400 (1979-02-01), Lovegrove
patent: 4474474 (1984-10-01), Blach

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