D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 3/24 (2006.01) D21C 3/22 (2006.01) D21C 9/00 (2006.01)
Patent
CA 2182688
The present invention relates to a process for continuous cooking of chemical pulp, in which the chips are fed into a chip chute (3), which is arranged on top of a high pressure feeder (4) for passing the chips into a downstream, pressurized continuous digester housing comprising a vertical, elongate digester (5) into which the chips are fed at the top and from which the cooked pulp is fed out at the bottom in order thereafter to be defibred and washed, after which the defibred pulp is screened, and an accepted flow of pulp is obtained which is fed onwards for continued treatment, and a reject flow is obtained which consists principally of knots, which reject flow is thus separated off from the pulp flow, the said reject flow, which consists principally of knots, being returned to the said chip chute (3), preferably after concentration and washing.
L'invention concerne un procédé de cuisson continue d'une pâte chimique dans lequel les copeaux sont envoyés dans une goulotte à copeaux (3) placée au sommet d'un dispositif d'alimentation haute pression (4), lequel est conçu pour faire passer ces derniers dans une enceinte de lessiveur continu sous pression située en aval et comprenant un lessiveur vertical allongé (5) dans lequel les copeaux sont introduits par son sommet, et du fond duquel la pâte cuite est évacuée pour être ensuite défibrée, lavée et tamisée. Le flux de pâte accepté ainsi obtenu est déplacé pour la suite du traitement, un flux de rejets consistant principalement en noeuds étant également obtenu, séparé du flux de pâte et renvoyé dans la goulotte de copeaux (3), de préférence après la concentration et le lavage.
Andtbacka Elisabeth
Andtbacka Stig
Bergqvist Anders
Borden Ladner Gervais Llp
Kvaerner Pulping Technologies Aktiebolag
Metso Paper Sweden Aktiebolag
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