Extruder screw with multiple flighting

Details Extruder screw with multiple flighting Extruder screw with multiple flighting

1995-12-14

1997-02-04

Jenkins, Robert W.

Agitating

Rubber or heavy plastic working

Stirrer is through-pass screw conveyor

366322, B29B 106

Patent

active

055990983

ABSTRACT:
A plastic materials screw has a metering section defined by a series of axially extending discontinuous and partially overlapping flightings. The flightings overlap each other by about a half to one turn to define overlapping portions whereby the flow in the primary channel is divided into a pair of secondary flow channels which have velocity profiles normal to the channel root greater than that in the primary channel. At the end of the overlapped portion, the first flighting is discontinued and the second flighting continues with a result that the flows are recombined in a distributive manner to provide improved mixing with a minimum of additional shear stress.

REFERENCES:
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patent: 4310484 (1982-01-01), Blakeslee, III
patent: 4321229 (1982-03-01), Blakeslee, III et al.
patent: 4350657 (1982-09-01), Jones et al.
patent: 4357291 (1982-11-01), Miller et al.
patent: 4729662 (1988-03-01), O'Brien
patent: 4746220 (1988-05-01), Sukai et al.
patent: 5088914 (1992-02-01), Brambilla
patent: 5219590 (1993-06-01), Kruder et al.

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