Twin type continuous kneading extruder

Details Twin type continuous kneading extruder Twin type continuous kneading extruder

1997-10-22

2000-05-30

Pyon, Harold

Plastic article or earthenware shaping or treating: apparatus

With separate and distinct upstream agitating or kneading means

With separate and distinct gas withdrawal chamber

366 75, 366 85, 366 86, 425204, 425205, B29C 4740

Patent

active

060684666

ABSTRACT:
A twin shaft continuous kneading extruder has a twin kneading feeder portion provided with two passages juxtaposed to each other within a casing. The passages are cocoon-shape in cross-section and hold two kneading shafts rotatably disposed in the respective passage portions. A single screw portion substantially extends one of the passages and holds a screw shaft that substantially extends one of the kneading feeder shafts. In addition, a plurality of mixing portions are provided on the twin kneading feeder portion. A first degassing open vent communicates with the kneading feeder shafts between mixing portions while a second vacuum degassing open vent is provided on the single screw portion. The first mixing portion keeps resin fed from a material feeding port in a semi-gelled condition. Thereafter, the resin is completely melted and kneaded in a second mixing portion after degassing. The resin is then fed to the single screw portion which subjects the resin to a vacuum degassing to be further extruded.

REFERENCES:
patent: 2615199 (1952-10-01), Fuller
patent: 3070836 (1963-01-01), De Haven et al.
patent: 3078511 (1963-02-01), Street
patent: 3749374 (1973-07-01), Buchheit
patent: 4025058 (1977-05-01), Mizuguchi
patent: 4900156 (1990-02-01), Bauer
patent: 5409366 (1995-04-01), Vincent

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