Method and apparatus for preparing paper pulp from used paper

Details Method and apparatus for preparing paper pulp from used paper Method and apparatus for preparing paper pulp from used paper

D - Textiles, Paper

21

D

D21D 5/20 (2006.01) D21D 5/02 (2006.01) D21F 1/66 (2006.01)

Patent

CA 2376795

The invention concerns a method and an equipment for combining in one single apparatus, the functions for filtering, decontaminating, and thickening paper pulp from used paper, while providing the complementary function of clarifying the filtrates. The apparatus (1) rotates at high speed. The paper pulp is introduced through the centre of the apparatus (2) and driven at its angular speed. The pulp is then brought along a grate (6) with small size holes for separating the fibres from the greater part of the water. The thickened pulp is evacuated through extraction nozzles (8). The water is clarified in the clarification zone (12) and recycled or eliminated depending on uses. More complete embodiments of the apparatus include the functions of fractionating, de-inking and purifying the pulp with slots or holes.

L'invention porte sur un procédé et un appareil qui permettent de relier, au sein d'un seul appareil, les fonctions de filtration, d'épaississement et de clarification des eaux résiduaires de pâte à papier à partir de vieux papiers, et d'ajouter, si requis, les fonctions de lavage, de désencrage, de fractionnement et de décontamination de la pâte. L'appareil (1) comprend un corps (1) qui tourne à grande vitesse. La matière à l'entrée est introduite par le centre de l'appareil (2) et est entraînée par sa vitesse angulaire. Elle est ensuite acheminée le long d'une grille immergée (6) avec des trous qui permettent la séparation entre les fibres et la plus grande partie de l'eau. La matière ainsi épaissie est évacuée par la périphérie (8). Les eaux sont clarifiées (12) et recyclées.

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