A process and apparatus for the production of cellulose...

D - Textiles – Paper – 21 – D

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D21D 5/24 (2006.01) D21D 5/00 (2006.01)

Patent

CA 2316980

A process and apparatus for the preparation of improved cellulose pulps is provided, in which defibered pulp is screened for removal of shives, and fibers with low bonding ability are removed in hydrocyclones, and rejects from the hydrocyclones are treated in refiner. In the process a specific combination of characteristics for the hydrocyclones and the volumetric flow is used in order to prepare pulps which give products of improved qualities, such as higher tensile strength, tear strength, light-scattering, surface smoothness, and especially low shive content.

Cette invention concerne un procédé et un appareil permettant de produire des pulpes de cellulose de meilleure qualité. La pulpe défibrée est tamisée de manière à éliminer les bûchettes, tandis que les fibres ayant un faible pouvoir d'adhérence sont éliminées dans des hydrocyclones. Les rejets des hydrocyclones sont ensuite traités dans un raffineur. On utilise dans ce procédé une combinaison spécifique de caractéristiques concernant les hydrocyclones et le débit volumétrique, ceci de manière à préparer des pulpes qui permettent de fabriquer des produits ayant de meilleures qualités comme, par exemple, une plus grande résistance en tension, une plus grande résistance au déchirement, une meilleure diffusion de la lumière, une plus grande douceur de surface et, surtout, une faible teneur en bûchettes.

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