Liquid purification or separation – Filter – With residue removing means or agitation of liquid
Patent
1994-08-04
1997-04-29
Lithgow, Thomas M.
Liquid purification or separation
Filter
With residue removing means or agitation of liquid
2104971, 209250, 209273, 209306, B07B 120, B07B 146, B01D 2964
Patent
active
056245580
ABSTRACT:
The differences in performance of a screening cylinder during screening of a fiber suspension (e.g. low consistency paper pulp) at the inlet end compared to the reject end is accommodated by constructing the feed side surface of the screening cylinder so that it induces greater turbulence in the vicinity of the screen cylinder surface adjacent the reject end of the screen than adjacent the inlet end. Typically this increase in turbulence is at least about 10% (preferably at least about 40%, and typically greater than 100%). The turbulence increase can be provided by a substantially smooth screening medium surface at the inlet end and a contoured screening medium surface adjacent the reject end, or by first and second contoured surfaces of different aggressiveness. Contoured surfaces typically include grooves, and variables that may be changed to affect the turbulence include the depth of the grooves, the angle of inclination of the downstream wall of the grooves, the spacing between the grooves, the radius of curvature of the opening (holes or slots) edges, the frequency of openings in grooves, and the dimensions of the openings (holes or slots) in the grooves. The screen cylinder is mounted in a pressure screen housing.
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Aaltonen Frank
Frejborg Frey
CAE ScreenPlates Inc.
Lithgow Thomas M.
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