D - Textiles – Paper – 21 – B
Patent
D - Textiles, Paper
21
B
D21B 1/04 (2006.01) B24D 5/00 (2006.01)
Patent
CA 2608207
The present invention provides a novel method and apparatus for producing pulp from lignocellulosic raw material, such as wood or annual or perennial plants, by mechanical defibration. According to the invention, fibers are peeled from the wood by means of grinding grits arranged on a defibration surface, wherein at least 90 % of the protrusion difference distribution between adjacent or neighboring grits on the surface belongs to a value region maximally as wide as the average grit diameter. By means of the invention, a reduction in specific energy consumption of up to 50 % or even more can be obtained.
L'invention concerne un procédé et un appareil nouveaux permettant de produire par défibrage mécanique de la pâte à papier à partir de matières premières lignocellulosiques telles que le bois ou des plantes annuelles ou pérennes. Selon l'invention, les fibres sont séparées du bois au moyen de grains de meulage placés sur une surface de défibrage, où au moins 90 % de la distribution des différences de saillies entre les grains contigus ou voisins sur la surface appartiennent à une zone de valeur au maximum aussi large que le diamètre de grain moyen. On peut ainsi obtenir une réduction de la consommation d'énergie spécifique allant jusqu'à 50 %, voire davantage.
Bjorkqvist Tomas
Lukander Mikael
Tuovinen Olli
Gowling Lafleur Henderson Llp
M-Real Oyj
Metso Paper Inc.
Myllykoski Oyj
Stora Enso Oyj
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