High defiberization chip pretreatment

D - Textiles – Paper – 21 – B

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D21B 1/14 (2006.01) D21B 1/02 (2006.01) D21B 1/16 (2006.01)

Patent

CA 2458273

A chip pretreatment process and apparatus which comprises conveying the chip material through a compression screw device (22) having an atmosphere of saturated steam at a pressure above about 5 psig, decompressing (24) and feeding the decompressed material from the decompression region (24) into a fiberizing device (26), such as a low intensity refiner, where at least about 30 percent of the fiber bundles and fibers are separated, without substantial fibrillation of the fibers. In another embodiment of the invention the chip defiberizing can be combined with chemical treatments, for improving the pulp property verses energy relationships.

Un processus de prétraitement de copeaux consiste à alimenter une matière en copeaux à travers un dispositif de compression à vis (22) avec une atmosphère de vapeur saturée, à une pression supérieure à environ 5 psig, à décomprimer (24) et à alimenter la matière décomprimée à partir de la région de décompression (24) dans un dispositif de formation de fibres (26), tel qu'un raffineur à faible intensité, au moins 30 % des faisceaux de fibres et des fibres étant séparées sans aucune fibrillation notable des fibres. Dans un autre mode de réalisation de l'invention, on combine la fibrisation des copeaux à des traitements thermiques pour améliorer le rapport entre la qualité de la pâte et la consommation d'énergie.

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