Classifying – separating – and assorting solids – Sifting – With liquid treatment
Patent
1990-02-09
1991-12-10
Fisher, Richard V.
Classifying, separating, and assorting solids
Sifting
With liquid treatment
209306, 162 55, 162380, B07B 120
Patent
active
050715437
ABSTRACT:
The invention relates to a method and a screening apparatus (1) for screening pulp. In the method, the maximum length of fibres and shives flowing through holes (4a) in a screen drum (4) is adjusted by moving blades (8) with a sharp front edge close to the surface of the screen drum (4) in such a manner that the sharp edge (8a) of the front face moving closest to the drum surface strikes shives or long fibers passing through the hole (4a) and pulls them back. The rate of travel of the blades (8) is so adjusted that the pulp flows in the hole (4a) only over a distance corresponding to the predetermined fiber length during the interval between the front edge of two successive blades (8). The screening apparatus (1) comprises blades (8) moving in parallel with the surface of the screen drum (4). The front edge of the blades defines in cross-section a sharp angle, the point of the angle defined by the front edge moving closest to the surface of the screen drum (4).
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Burns Todd J.
Fisher Richard V.
OY Tampella AB
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