A method for selective removal of ray cells from cellulose pulp

D - Textiles – Paper – 21 – D

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

Patent

CA 2524177

The content of ray cells in cellulose pulp causes problems and therefore these ray cells should be removed from the cellulose pulp to improve the pulp quality. The present invention makes this possible and comprises a method wherein at first an advancing pulp suspension is screened or vortex cleaned, (3) leading to the formation of an accept pulp fraction (4) and a reject pulp fraction (5) and that the reject pulp fraction is cleaned and divided, and that accepted material (pulp fibres and valuable fine material) is brought to further treatment and/or use. The invention is characterized in that the cleaning and division of the reject pulp suspension is carried out so that substantially all ray cells are present in the apex fraction of a fractionating cyclone (6) (if that is the kind of device used) and in that said fraction as such constitutes a very limited material stream, or in that a very limited material stream, predominantly containing ray cells is selected from the apex fraction, and in that this very limited material stream is brought to a disposal stage.

Le contenu des cellules de rayon dans la pâte à papier engendre des problèmes. L'invention vise donc à retirer ces cellules de rayon de la pâte à papier pour améliorer la qualité de la pâte. A cet effet, le procédé de l'invention consiste à tamiser ou épurer par centrifugation (3) une suspension de pâte alimentée, ce qui permet d'obtenir une fraction de pâte (4) acceptée et une fraction de pâte (5) rejetée ; la fraction de pâte rejetée est épurée et divisée, et la matière acceptée (fibres de pâte et matière fine intéressante) est soumise à un traitement et/ou à une utilisation ultérieurs. L'invention est caractérisée en ce que l'épuration et la division de la suspension de pâte rejetée sont effectuées de telle façon que sensiblement toutes les cellules de rayon soient présentes dans la fraction apex d'un cyclone de fractionnement (6) (si cela est le type de dispositif utilisé) et en ce que cette fraction en tant que telle constitue un flux de matière très limité, ou en ce qu'un flux de matière très limité, contenant essentiellement des cellules de rayon, est sélectionné dans la fraction apex, et en ce que ce flux de matière très limité est amené à une étape d'élimination.

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