Patent ID: 7083049

Claim:
A method of regulating multi-stage sorting systems in paper production, in which the fiber suspension (S) respectively supplied to a sorting stage is separated into at least two fractions, namely a fine fraction (F) and a coarse fraction (G), and at least one portion of a coarse fraction is again sorted and at least the thereby obtained fine fraction is returned to a sorting process, characterized in that, at each sorting stage ( 1 , 9 , 15 ) of a sorting system, mass flows at the input side and at the output side are determined by at least one of online measurement or by calculation and the values obtained are supplied to a processor ( 25 ) associated with the sorting system for mathematical modeling and state regulating of the sorting system; in that at each sorting stage ( 1 , 9 , 15 ) a setting valve ( 4 , 8 , 12 , 14 , 18 , 21 ) is arranged in at least one of a discharge line for the fine fraction and a discharge line for the coarse fraction, said setting valves ( 4 , 8 , 12 , 14 , 18 , 21 ) being connected to said processor; and in that said processor influences output side mass flows of the sorting stages ( 1 , 9 , 15 ) by controlling or regulating said setting valves ( 4 , 8 , 12 , 14 , 18 , 21 ) and/or selectable machine parameters including at least one of slot width, slot speed, rotor speed and section angle of the sorting stages in dependence on pre-settable target parameters including at least one of production, efficiency, and fiber loss.