Dewatering device

D - Textiles – Paper – 21 – C

Patent

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Details

D21C 9/18 (2006.01) B01D 33/06 (2006.01) B01D 33/073 (2006.01) B30B 9/20 (2006.01)

Patent

CA 2350102

The present invention relates to a dewatering device for dewatering material suspensions. The device comprises two cylindric rotary rolls (1), which between themselves form a nip (2), through which the material is intended to pass downward from above and thereby be dewatered. According to known art a doctor abuts the liquid permeable roll (1) after the nip. The doctor and also the roll (1) get worn. Problems also often arise due to re-wetting of the dewatered material. According to the invention the doctor is replaced by a screen device (11) located below the nip and comprising at least one screen (12). The screen extends along the entire length of the roll, and its uppermost portion (13) is located closest to the roll (1). The distance between the uppermost portion (13) and the roll (1) is so great that a filtrate liquid film (10) formed after the nip can pass inbetween the roll (1) and uppermost portion (13) of the screen before the filtrate liquid film (10) leaves the roll (1). The screen (12) is located so that the filtrate after having left the roll (1) is prevented from re-wetting the dewatered material.

La présente invention concerne un dispositif d'égouttage pour matières en suspension. Ce dispositif comprend deux rouleaux cylindriques rotatifs (1) formant entre eux une zone de pincement (2) que le matériau traverse de haut en bas en évacuant l'eau qu'il renferme. Selon un procédé connu, une racle vient en contact avec le rouleau perméable au liquide (1). Or, la racle ainsi que le rouleau (1) sont exposés à l'usure. De plus, des problèmes se posent souvent du fait que le matériau égoutté se recharge en eau. Dans la présente invention, la racle est remplacée par un dispositif de tamisage (11) qui est situé sous la zone de pincement et qui comprend au moins un tamis (12). Le tamis s'étend sur toute la longueur du rouleau, sa partie la plus élevée (13) étant la plus proche du rouleau (1). L'écart entre la partie la plus haute (13) et le rouleau (1) est tel qu'une pellicule liquide de filtrat (10) qui s'est formée en aval de la zone de pincement peut passer entre la partie (13) et le rouleau (1) avant que ce filtrat ne quitte ledit rouleau (1). Le tamis (12) est positionné de telle sorte que le filtrat ne puisse pas remouiller le matériau égoutté après avoir quitté le rouleau (1).

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