Dewatering of water-moist graft rubber

Details Dewatering of water-moist graft rubber Dewatering of water-moist graft rubber

1996-10-24

1998-10-06

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264349, 425203, 425205, B29C 4740, B29C 4776

Patent

active

058172661

ABSTRACT:
Essentially dry materials are obtained by mechanically dewatering water-moist rubber, prepared by emulsion polymerization and precipitation, to give a compact material having a rubber content of at least 50%, by a process in which the previously dewatered rubber is fed to the feed section of a twin-screw extruder which has screws rotating in the same direction and possesses, in succession in the conveying direction, at least two back-up zones and two associated dewatering orifices, each of which may be provided with a retaining screw, and at least one kneading zone, one devolatilization zone and finally one discharge zone, which may be closed by a die lip, and the water separated off is discharged at the dewatering orifices in liquid form.

REFERENCES:
patent: 3672641 (1972-06-01), Slaby
patent: 3796677 (1974-03-01), Laber et al.
patent: 4110843 (1978-08-01), Skidmore
patent: 4446094 (1984-05-01), Rossiter
patent: 5232649 (1993-08-01), Andersen et al.
Pat. Abst. of Japan, vol. 9, No. 87 (M-372) Apr. 17, 1985 English abstract of JP 59-214631.
Pat. Abst. of Japan, vol. 13, No. 500 (M-891) Nov. 10, 1989 English abstract of JP 1-202406.

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