Method and apparatus for draining fibre pulp suspension

Details Method and apparatus for draining fibre pulp suspension Method and apparatus for draining fibre pulp suspension

D - Textiles, Paper

21

F

D21F 1/00 (2006.01) D21F 1/66 (2006.01) D21F 9/00 (2006.01) D21F 11/00 (2006.01)

Patent

CA 2462622

The invention relates to a method of draining a fibre pulp suspension in an improved and more efficient manner which prevents the premature creation of a tight fibre mat, where the fibre pulp suspension is applied to a convergent dewatering space arranged between two wires travelling in the same direction. In the dewatering space, water and powdery substance are removed from the fibre pulp suspension through the wires. Pressure pulses are generated in the fibre pulp suspension along the length of the dewatering space with pressure pulse elements that are on opposite sides of the wires relative to the fibre pulp suspension and in contact with or at a distance from the wires. The invention also relates to an apparatus according to the method.

L'invention concerne un procédé permettant d'égoutter une suspension de pâte fibreuse (3). Dans ce procédé, la suspension (3) est appliquée à un espace d'essorage convergent (9) ménagé entre deux toiles (1, 2) circulant dans le même sens. Dans cet espace d'essorage (9), l'eau (11, 12) et une substance pulvérulente sont éliminées de la suspension (3) à travers les toiles (1, 2). Des impulsions de pression (13, 14) sont générées dans la suspension (3) le long de la longueur de l'espace d'essorage (9) au moyen d'éléments d'impulsions de pression (10a, 10b) qui sont placés sur les côtés opposés des toiles (1, 2) par rapport à la suspension (3), et qui sont en contact avec lesdites toiles ou placés à distance de celles-ci (1, 2). La présente invention concerne également un dispositif permettant de mettre en oeuvre ce procédé.

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