High consistency pulp refining using low consistency pulp...

D - Textiles – Paper – 21 – D

Patent

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D21D 1/30 (2006.01)

Patent

CA 2232793

A refiner apparatus and method for producing refined pulp by exerting mechanical forces on pulp fibres. The apparatus includes a member having a pulp side and a drainage side, the pulp side having a plurality of spaced apart raised bar portions thereon. A plurality of drainage conduits are formed in the member, the conduits extending between the pulp side and the drainage side of the member, each drainage conduit having inlet and outlet openings respectively. The inlet openings are disposed on the pulp side of the member and the outlet openings are disposed on the drainage side of the member such that water expelled from pulp fibres forced against the pulp side is received in the inlet openings and is conducted through the drainage conduits to the drainage side of the member. Generally, the method involves draining water from pulp fibres squeezed between facing refiner members, through at least one drainage conduit in at least one of the refiner members. Use of the method produces a low consistency pulp solution of refined pulp having properties comparable to high consistency refined pulp.

Un raffineur et un procédé de raffinage donnent une pâte raffinée grâce à des forces mécaniques s'exerçant sur des fibres de pâte. Le raffineur comprend un élément doté d'un côté pâte et d'un côté drainage, le côté pâte présentant plusieurs barres espacées et dressées. L'élément renferme plusieurs drains reliant les côtés pâte et drainage, chaque drain étant doté d'orifices d'entrée et de sortie sur ces côtés respectifs. Les orifices d'entrée sont disposés du côté pâte de l'élément et les orifices de sortie le sont du côté drainage pour que l'eau, exprimée hors des fibres de pâte comprimées sur le côté pâte, passe dans les orifices d'entrée et traverse les drains vers le côté drainage de cet élément. D'une manière générale, le procédé consiste à drainer l'eau provenant des fibres de pâte, pressées entre des éléments de raffineur se faisant face, au travers d'au moins un drain d'au moins un des éléments du raffineur. Ce procédé donne une solution de pâte raffinée de faible densité aux propriétés comparables à celles d'une pâte raffinée de haute densité.

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