A doctor blade arrangement and method in fibre processing

D - Textiles – Paper – 21 – C

Patent

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Details

D21C 9/18 (2006.01) D21F 2/00 (2006.01) D21F 3/02 (2006.01) D21G 3/00 (2006.01)

Patent

CA 2756641

An arrangement (30) for removal of a fibre web from a fibre conveying support (21) comprises a doctor beam (34) and a doctor blade (32) having a web contacting edge (33). The doctor blade (32) and the doctor beam (34) are attached to each other by a pivotable attachment (37). The arrangement further comprises a hose (40) for fluids arranged for applying a force between the doctor beam (34) and the doctor blade (32) at a distance from the pivotable attachment (37) when being pressurized to move the web contacting edge (33) towards the fibre conveying support (21) and a hose pressurizing arrangement connected to the hose (40). The arrangement can be utilized in a twin-wire press. A method for operating such an arrangement comprises preferably pressurizing of the hose and controlling the pressurizing dependent on an operating condition.

L'invention porte sur un agencement (30) pour le retrait d'une bande de fibre à partir d'un support de transport de fibre (21), lequel agencement comprend une tige de racle (34) et une racle (32) comportant un bord de contact de bande (33). La racle (32) et la tige de racle (34) sont fixées l'une à l'autre par une fixation pivotante (37). L'agencement comprend en outre un tuyau souple (40) pour des fluides, configuré de façon à appliquer une force entre la tige de racle (34) et la racle (32) à une certaine distance de la fixation pivotante (37) lors de la compression pour déplacer le bord de contact de bande (33) vers le support de transport de fibre (21) et un agencement de compression de tuyau relié au tuyau (40). L'agencement peut être utilisé dans une presse à double toile. L'invention porte également sur un procédé pour faire fonctionner un tel agencement, lequel procédé comprend, de préférence, la compression du tuyau et la commande de la compression en fonction d'une condition de fonctionnement.

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