Fabric dewatering device and method

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 1/74 (2006.01) D21F 1/32 (2006.01) D21F 7/12 (2006.01)

Patent

CA 2426017

A device is provided for dewatering a fabric in which the fabric is used in a papermaking process that exposes it to water before it is directed to the fabric dewatering device. The fabric dewatering device includes leading and trailing guide rolls about which the fabric is partially wrapped to form a loop portion. The loop portion is suspended between the leading and trailing guide rolls and includes a trough portion with a relatively small diameter that is positioned below the axes of the guide rolls. Running the fabric through the trough portion at high speeds exposes the water trapped therein to high centrifugal forces. The centrifugal forces expel the water from the fabric. The geometry and positioning of the trough portion is maintained either through a difference in fabric speed maintained by the leading and trailing nips or by the use of a rider roll positioned within the loop. A non- contact sensor in proximity to the trough portion senses the position of the trough portion and provides feedback to a controller which controls the motion of the rolls.

L'invention se rapporte à un dispositif d'essorage d'un tissu, ledit tissu étant utilisé dans un procédé de fabrication de papier et exposé à l'eau avant d'être acheminé vers le dispositif d'essorage de tissu. Ce dernier comprend des rouleaux-guides meneurs autour desquels le tissu s'enveloppe partiellement de manière à former une boucle qui est suspendue entre les rouleaux-guides et comprend une cuve de diamètre relativement petite placée sous les axes des rouleaux-guides. L'acheminement du tissu à travers cette cuve à des vitesses élevées soumet l'eau dont le tissu est imprégné à des forces centrifuges élevées, l'eau étant ainsi refoulée du tissu. La configuration et l'emplacement de la cuve sont maintenus intacts grâce à la différence de vitesse d'acheminement du tissu au niveau des lignes de contact ou grâce à la présence d'un rouleau presseur placé au sein de la boucle. Un capteur de non contact à proximité de la cuve a pour mission de détecter la position de ladite cuve et de fournir une rétroaction à un contrôleur chargé de commander le déplacement des rouleaux.

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