Preparation of plastic extrudate containing an additive

Details Preparation of plastic extrudate containing an additive Preparation of plastic extrudate containing an additive

1988-05-18

1989-10-31

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2641761, 264211, 264349, 264DIG65, 366 76, 425207, 4253791, B29C 4710

Patent

active

048775681

ABSTRACT:
Pellets of polymeric material are fed into the hopper of a screw extruder to produce a molten extrudate, and a liquid additive, particularly a molten lubricant, is introduced downstream of the hopper into the root of a screw flight, particularly in the feed section of the screw longitudinally and internally of the screw shaft.

REFERENCES:
patent: 3121914 (1964-02-01), Olson et al.
patent: 3484507 (1969-12-01), Smith
patent: 3679788 (1972-07-01), Kiyono et al.
patent: 3790327 (1974-02-01), Haberle
patent: 3907963 (1975-09-01), Blackmon
patent: 3966857 (1976-06-01), Charlton et al.
patent: 4405239 (1983-09-01), Chung et al.
patent: 4530732 (1985-07-01), Horn
patent: 4657499 (1987-04-01), Lewellen et al.

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