Apparatus for dewatering and or washing papermaking stock

Details Apparatus for dewatering and or washing papermaking stock Apparatus for dewatering and or washing papermaking stock

1994-11-02

1997-01-07

Lamb, Brenda A.

Liquid purification or separation

Filter

Movable medium

162317, 162 60, 162 56, B01D 3300

Patent

active

055913369

ABSTRACT:
Improved apparatus for dewatering or washing a suspension of paper pulp in which first and second rolls are rotatably mounted with an endless loop of wire tensioned around the rolls, and in which a headbox delivers a pulp suspension to be thickened or washed and positioned with an outlet to discharge the pulp suspension into or onto the wire as it approaches the first roll, and in which the washed or dewatered pulp is collected after it has passed between the wire and a second roll, in which the first roll has a central shaft, and screw flighting on the shaft formed in left and right-hand sections are terminated at cylindrical discs mounted at opposite ends of the shaft, and in which the screw flighting has a depth which is substantially greater than the maximum thickness of the pulp layer and in which the aggregate open area between the screw flights is substantially greater than the cross-sectional area of the headbox outlet to assure that the spaces between the flights can be no more than partially filled with a pulp suspension during operation.

REFERENCES:
patent: 847352 (1907-03-01), Meincke
patent: 1241905 (1917-10-01), Behr
patent: 4559104 (1985-12-01), Eriksson
patent: 4722793 (1988-02-01), Seifert et al.
patent: 5133832 (1992-07-01), Gilkey

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