Classifying – separating – and assorting solids – Sifting – With liquid treatment
Patent
1990-04-19
1991-03-19
Hajec, Donald T.
Classifying, separating, and assorting solids
Sifting
With liquid treatment
209306, 210415, B07B 120
Patent
active
050008420
ABSTRACT:
Fiber suspension, such as paper pulp flowing to the headbox of a paper machine, is acted upon by apparatus which affects the axial direction and magnitude of the speed of the fiber suspension during screening to optimize results. A rotor cooperates with a screen cylinder, the rotor having a plurality of projections arranged along its axial length. The axial length of the rotor preferably has different axially extending circumferential zones. The projections have non-axial surfaces which act on the suspension to change the axial forces. Different shapes of projections are preferably provided in the different zones so that the axial forces vary in dependence upon the distance from the inlet to the screen casing, and the discharge outlet from the screen casing.
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A. Ahlstrom Corporation
Hajec Donald T.
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