D - Textiles – Paper – 21 – B
Patent
D - Textiles, Paper
21
B
D21B 1/18 (2006.01) D21D 1/00 (2006.01)
Patent
CA 2294424
The invention relates to a method for the control of a groundwood pulping process. According to the invention the drainability (freeness, CF) of the pulp and another quantity Q characterising the pulp quality are measured, whereby the quantity Q preferably is the tearing resistance (tear index RI), and the measured values CFx and Qx are compared with the set points CF0 and Q0 of the corresponding quantities. The wood supply rate Vn or the wood supply pressure Fn, and the grinding stone's peripheral speed Vp are adjusted so that the sum (CFx - CF0)2 + (Qx - Q0)2 obtains its minimum value.
L'invention concerne un procédé servant à commander une opération de réduction de bois en pâte mécanique. Ce procédé consiste à mesurer l'aptitude à l'égouttage (indice d'égouttage, CF) de la pâte, ainsi qu'une autre quantité Q caractérisant la qualité de la pâte, la quantité Q représentant, de préférence, la résistance au déchirement (indice de déchirement RI), puis à comparer les valeurs mesurées CF¿x? et Q¿x? aux points de contrôle CF¿0? et Q¿0? des quantités correspondantes. On règle la vitesse d'alimentation en bois V¿n? ou la pression d'alimentation en bois F¿n? et la vitesse périphérique V¿p? de la meule, de sorte que la somme (CF¿x? - CF¿0?)?2¿ + (O¿x? - O¿0?)?2¿ atteint sa valeur minimum.
Forsman Tom
Smart & Biggar
LandOfFree
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