Barrier screw

Details Barrier screw Barrier screw

1987-07-06

1988-09-13

Simone, Timothy F.

Agitating

Rubber or heavy plastic working

Stirrer is through-pass screw conveyor

366 76, 366323, B29B 106

Patent

active

047705396

ABSTRACT:
The present invention relates to a barrier screw having improved solids conveying capability. The barrier screw comprises a feed zone having a helical primary flight defining a solid material feed path, a transition zone for converting the solid material into molten material having a solids channel and a melt channel, and a metering zone for mixing molten plastic material from the melt path. In the feed zone, the helical flight defining the feed path is characterized by a substantially constant leading edge pitch and a trailing edge pitch which causes the thickness of the flight to increase as one moves along the screw barrel toward the beginning of the melt channel in the transition zone.

REFERENCES:
patent: 3487503 (1970-01-01), Barr
patent: 3530534 (1970-09-01), Pomper
patent: 3671021 (1972-06-01), Pomper et al.
patent: 3671141 (1972-06-01), Kovacs
patent: 3689182 (1972-09-01), Kovacs
patent: 3698541 (1972-10-01), Barr
patent: 3989941 (1976-11-01), Gasior et al.
patent: 4129386 (1978-12-01), Rauwendaal
patent: 4310484 (1982-01-01), Blakeslee
patent: 4329313 (1982-05-01), Miller et al.
patent: 4330214 (1982-05-01), Willert
patent: 4341474 (1982-07-01), Wheeler, Jr. et al.
Heung-Tai Kim, "High-yield Extruder Screw Melts and Pumps in Step", Plastics Engineering, Aug., 1985, pp. 27-30.

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