Arthur V Jepsen

US Patent:

56016905, Feb 11, 1997

Filed:

Jul 11, 1994

Appl. No.:

8/273467

Inventors:

W. Thomas Gauld - Mobile AL
Ronald Visser - Theodore AL
Arthur V. Jepsen - Mobile AL

Assignee:

Gauld Equipment Company - Theodore AL

International Classification:

D21C 908
B07B 122

US Classification:

162 55

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.