D - Textiles – Paper – 21 – D
Patent
D - Textiles, Paper
21
D
D21D 5/02 (2006.01) D21B 1/04 (2006.01) D21D 1/00 (2006.01)
Patent
CA 2399881
The invention relates to a method for controlling the quality of pulp. Pulp produced by mechanical defibering of wood is screened to provide at least two fractions, of which the accept that has passed the screening phase is carried forward for use and the reject that has not passed the screening is removed from the screening phase (3; 5; 8). An underlying idea of the invention is that the consistency (C2; C3; C5) of the reject that is to be removed from the screening is measured and the consistency value thus obtained is used for controlling the defibrator (1; 7) to adjust the quality of the accept.
La présente invention concerne un procédé de contrôle de qualité de la pâte de bois. La pâte produite par le défibrage mécanique du bois est criblée afin de produire au moins deux fractions, dont une fraction acceptée lors du criblage qui est retenue pour être utilisée et une fraction rejetée lors du criblage qui est retirée du criblage (3; 5; 8). Selon la présente invention, on mesure la consistance (C¿2?; C¿3?; C¿5?) de la fraction rejetée lors du criblage et l'on utilise la valeur de consistance obtenue pour commander le dispositif de défibrage (1; 7) de façon à réguler la qualité de la fraction acceptée.
Jussila Tero
Niinimaki Jouko
Metso Paper Inc.
Sim & Mcburney
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