Screening of fibrous suspensions

Details Screening of fibrous suspensions Screening of fibrous suspensions

D - Textiles, Paper

21

D

D21D 5/02 (2006.01)

Patent

CA 2341535

A method of separating a fiber fraction by screening from a liquid containing fibers and small particles, where the separation takes place in that the ingoing liquid is allowed to flow along a screen member with screen apertures from an inlet (2) to a first outlet (3) for a first fraction which passes through the screen apertures, and a second outlet (4) for a second fraction, which does not pass through the screen apertures. 50-80 % of the flow of the second fraction is recycled from the second outlet (4) to the inlet (2) for increasing the concentration of network forming fibers in the ingoing liquid.

Cette invention concerne un procédé qui permet de séparer par tamisage une fraction fibreuse d'un liquide contenant des fibres ainsi que des particules de petite taille. La séparation se fait en faisant s'écouler le liquide entrant le long d'un élément tamis comportant des ouvertures de tamisage. L'écoulement se fait depuis une entrée (2) vers une première sortie (3) pour une première fraction passant à travers les ouvertures du tamis, et vers une seconde sortie (4) pour la seconde fraction ne passant pas à travers ces ouvertures. 50 à 80 % du débit de la seconde fraction sont renvoyés de la seconde sortie (4) vers l'entrée (2) afin d'accroître la concentration des fibres formant un réseau dans le liquide entrant.

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