Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With classifying – separating or screening of pulp
Patent
1994-07-11
1997-02-11
Czaja, Donald E.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With classifying, separating or screening of pulp
162 58, 209240, 209234, 209273, D21C 908, B07B 122
Patent
active
056016905
ABSTRACT:
A method for screening fibrous stock slurry having a rotor impeller and a screen, in which accepts quality and throughput may be adjusted without stopping the screening process by relative displacement of the clearance between the rotor and the screen plate. In one version, this relative displacement is accomplished by axial displacement of frusto-conical portions of the bladed rotor and screen. The relative axial displacement changes the degree of pulp disturbance in a primary screening zone, thus causing throughput and accepts quality to change accordingly. The primary screening zone may be between the rotor impeller and the screen, or it may be on the other side of the screen, in which case the blades on the screen are designed to permit a portion of the pulp slurry to flow through the screen into a region between the rotor impeller and the screen. Axial displacement may also be used to effect an adjustable clearance between a planar screen and a planar rotor impeller or between a rotor having an inclined surface for slidable blades and a cylindrical screen.
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"Stock Preparation," Hanbook of Pulp and Paper Technology, pp. 305-307, (date unknown).
Gauld W. Thomas
Jepsen Arthur V.
Visser Ronald
Czaja Donald E.
Fortuna Jos'e A.
Gauld Equipment Company
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