Method of refining wood chips or pulp in a high consistency...

D - Textiles – Paper – 21 – D

Patent

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D21D 1/30 (2006.01) B02C 23/18 (2006.01)

Patent

CA 2595551

A method is proposed for improving pulp quality at high production rates on conical disc refiners. It permits a reduction in refining intensity by enabling fibre residence time to increase by increasing consistency, while avoiding the problem of plate plugging normally associated with high discharge consistency. In practice, inlet consistency is increased by the in-feed dilution, flat zone dilution or both, but without allowing the discharge consistency to rise. Instead, the discharge consistency is controlled at a fixed optimum value by the addition of dilution water within the conical zone. The result is that residence time is increased, and refining intensity decreased, by raising the consistency in the inner region of the refining zone, while avoiding the plate plugging caused by excessive consistency in the outer region of the refining zone.

L'invention concerne un procédé permettant d'augmenter la qualité de pulpe à des vitesses de production élevées sur des raffineurs à disque conique. Grâce à ce procédé on peut réduire l'intensité de raffinage en permettant de prolonger le temps de séjour de fibre en augmentant la compacité, tout en évitant le problème d'obturation des plateaux normalement associé à une grande compacité de décharge. Dans la pratique, la compacité d'admission est augmentée par la dilution d'alimentation, la dilution de zone plate ou les deux, mais sans laisser progresser la compacité de décharge. Au lieu de cela, la compacité de décharge est contrôlée pour correspondre à une valeur optimale fixe par l'addition d'eau de dilution dans la zone conique. Le résultat est que le temps de séjour se trouve rallongé, et l'intensité de raffinage est réduite, en augmentant la compacité dans la région interne de la zone de raffinage, tout en évitant l'obturation des plateaux causée par une compacité excessive dans la région externe de la zone de raffinage.

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