Method for controlling a multi-phase screening apparatus

Details Method for controlling a multi-phase screening apparatus Method for controlling a multi-phase screening apparatus

1998-04-01

2000-06-27

Fiorilla, Christopher A.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With classifying, separating or screening of pulp

162 61, D21C 908

Patent

active

06080274&

ABSTRACT:
A method and apparatus for controlling a multi-step screening apparatus (1) controls other accept, reject and dilution flows in relation to the flow measured in the accept channel (7a) of the first screening step (3a). Thus a simpler control unit (9) can be used and accept of higher quality can be obtained than before. The apparatus has a control unit (9) aranged to measure the flows of all accept, reject and dilution water channels (7a-7c, 5a, 5b, 11a, 11b) and to adjust the flow of the other channels on the basis of the flow of the accept channel of the first step.

REFERENCES:
patent: 4207141 (1980-06-01), Seymour
patent: 4504016 (1985-03-01), Wikdahl
patent: 4994145 (1991-02-01), Seymour
patent: 5534139 (1996-07-01), Cadek et al.

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