Process and device to manufacture cellulose pulp

D - Textiles – Paper – 21 – D

Patent

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D21D 5/24 (2006.01) D21B 1/12 (2006.01) D21D 1/00 (2006.01)

Patent

CA 2559828

Process and device to manufacture and dewater cellulose pulps in which defibered cellulose is screened to remove shives, fractionated in to at least three fractions (10, 3, 12), which fractions are treated each by itself and then are brought together completely or partly, and that the fractionation is done according to specific surface, preferably with hydrocyclones, and that the process comprises process stages (6,7) that fractionates out fibers with high specific surface, preferably thin-walled fibers, and that the process comprises process stages (2) that fractionates out fibers that have lower specific surface, preferably fibers with thicker fiber wall, and that one or several fiber fractions (3, 3a) are treated, to be split, fibrillated and permanently collapsed, preferably with a refiner, ball mill or similar.

L'invention concerne un procédé et un dispositif pour la fabrication et la déshydratation de pâte à papier : on trie la pâte défibrée pour éliminer les bûchettes, puis on la fractionne au moins en trois fractions (10, 3, 12) destinées à être traitées chacune indépendamment et regroupées entièrement ou partiellement, le fractionnement s'effectuant selon la surface spécifique, de préférence au moyen d'hydrocyclones, et on distingue des étapes de fractionnement (6, 7) des fibres suivant une surface spécifique importante, de préférence pour donner des fibres à paroi mince, et le fractionnement comprend aussi des étapes de fractionnement (2) des fibres suivant une surface spécifique inférieure, de préférence pour donner des fibres à paroi plus épaisse ; ensuite, une ou plusieurs fractions de fibres (3, 3a) sont traitées, pour être divisées, fibrillées et renversées de façon permanente, de préférence au moyen d'un raffineur, broyeur à billes ou appareil identique.

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