Low-resident, high-temperature, high-speed chip refining

D - Textiles – Paper – 21 – B

Patent

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D21B 1/02 (2006.01) F27D 27/00 (2010.01) B01F 3/04 (2006.01) B01F 5/04 (2006.01) D21D 1/30 (2006.01) F27D 3/14 (2006.01) F27D 3/16 (2006.01)

Patent

CA 2197455

A method for refining lignocellulose-containing material into pulp in a primary refiner, preferably a disc refiner (32). The material is preheated (20, 22, 24) to a temperature greater than the glass transition temperature of the lignin in the material. The material is held at this temperature for a time interval under one minute, preferably in the range of 10-30 seconds. The heated material is then subject to high intensity refining in the refiner to produce pulp. The resulting pulp has a high quality which affords great flexibility in secondary refining (44). The preheat retention interval can be adjusted to emphasize different objectives, such as reducing total specific energy (Fig. 2) or increasing strength properties (Figs. 3 and 4).

Cette invention concerne un procédé de raffinage d'une matière contenant de la lignocellulose dans le but de la transformer en pâte, ledit raffinage étant effectué dans un raffineur primaire, de préférence un raffineur à disques (32). On préchauffe (20, 22, 24) ladite matière jusqu'à une température supérieure à la température de transition vitreuse de la lignine contenue dans ladite matière. On maintient ladite matière à cette température pendant une durée inférieure à une minute, de préférence de l'ordre de 10 à 30 secondes. On soumet ensuite la matière chauffée à un raffinage de grande intensité dans le raffineur pour obtenir la pâte. La pâte obtenue est de grande qualité, ce qui procure une grande flexibilité lors du raffinage secondaire (44). On peut ajuster la durée du temps de séjour en phase de préchauffage dans le but d'atteindre différents objectifs tels que la réduction de l'énergie spécifique totale (Fig. 2) ou l'accroissement des caractéristiques mécaniques.

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