Classifying – separating – and assorting solids – Sifting – With liquid treatment
Patent
1993-04-15
1996-03-12
Terrell, William E.
Classifying, separating, and assorting solids
Sifting
With liquid treatment
209273, 209281, 209413, 210415, B07B 122
Patent
active
054978866
ABSTRACT:
A hydrodynamic device for generating negative pressure excursions in a pulp slurry during fine screening, includes a plurality of half-foil members disposed on a substantially cylindrical outer surface of a rotor. The rotor is mounted within and co-axial with a substantially cylindrical screen having a circumferentially continuous apertured zone to define an annular screening chamber between the rotor and the screen. The half-foil members are collectively at least axially co-extensive with the apertured zone and have a leading edge which, also collectively, is inclined at a spiral angle relative to the axis of the rotor such that during rotation, the collective leading edge of the half-foil members conduct large particles downwardly through the screening chamber. A selection of hydrodynamic foil configurations is provided in order to adapt to a wide range of pulp types and screening conditions.
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Abdulmassih Antoine G.
Young Douglas L. G.
Ingersoll-Rand Company
Minns Michael H.
Palermo Robert F.
Reichard Dean A.
Terrell William E.
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