Apparatus for screening to remove knots from a fluid borne slurr

Details Apparatus for screening to remove knots from a fluid borne slurr Apparatus for screening to remove knots from a fluid borne slurr

1990-11-08

1992-09-01

Dayoan, D. Glenn

Classifying, separating, and assorting solids

Plural, diverse separating operations

Aqueous suspension and sifting

209270, B07B 122

Patent

active

051432200

ABSTRACT:
A screening apparatus removes a fluid borne pulp fiber slurry from knots which have been concentrated from a pulp processing stream. A rotating radially symmetrical screen provides centrifugal screening to accept a pulp fiber slurry while an integrally connected spiral flight conveyor transports knots from the inner surface of the screen to a knot discharge chamber located axially above the screening chamber. Above the screening chamber but below the liquid level in the housing, a fiber free wash liquor is provided through a tangentially oriented nozzle in the direction of rotation of the spiral flight conveyor to release fibers from the knot surfaces thereby enabling them to pass through the screen. The screening apparatus also provides for removal of heavy tramp materials, for maintaining liquid level control, for minimizing air entrainment and foam formation, and for preventing clogging of the screen apertures and knot discharge outlet.

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