Classifying – separating – and assorting solids – Sifting – With liquid treatment
Patent
1991-12-11
1992-12-22
Hajec, Donald T.
Classifying, separating, and assorting solids
Sifting
With liquid treatment
209273, 209380, 210415, D21D 500, B07B 120
Patent
active
051728133
ABSTRACT:
A method and apparatus for treating a fiber suspension to thicken or screen it. The suspension is fed to the gap between a filter surface and a counter member, and accepts flow through openings in the filter surface. Rejects continue along the filter surface to a rejects outlet. Relative movement, preferably relative rotation, is effected between the filter surface and counter member. The suspension at the filter surface is coarser and/or of higher solids concentration than the accepts. This coarser suspension is subjected to a force component by a protrusion on the counter member surface that tends to move it away from the filter surface, in a guided manner (between the protrusion and a guide plate). A second protrusion in the form of a backwardly inclined plate forces fresh suspension toward the filter surface to take the place of the suspension just moved away from the surface.
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A. Ahlstrom Corporation
Hajec Donald T.
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