Method and device for controlling a wire in a forming gap of...

Details Method and device for controlling a wire in a forming gap of... Method and device for controlling a wire in a forming gap of...

D - Textiles, Paper

21

F

D21F 9/00 (2006.01)

Patent

CA 2110886

ABSTRACT Method and device for controlling a wire in the forming gap of a twin-wire web former of a paper machine, which gap is defined between two opposite forming wires. A pulp suspension jet is fed out of the discharge opening of the headbox of the paper machine into the forming gap. The jet has a free flight distance before it meets the forming wires. In the area of the forming gap, a variable-crown or adjustable-crown breast roll is employed as the breast roll of at least one of the wires. The deflection of the mantle of this breast roll is regulated actively from inside the mantle of the breast roll. In this manner, the transverse tightness profile of the wire guided by the breast roll and/or possible instabilities of the wire is/are controlled in particular in the area of the forming gap. 21

Cette invention concerne une méthode et dispositif de réglage de la toile double d'une machine à papier en aval de la caisse d'arrivée, là où les deux toiles définissent un entrefer de formation. Un jet de pâte à papier est projeté par la fente de la caisse d'arrivée entre les deux toiles. Le jet de pâte a une hauteur de chute donnée avant d'arriver entre les deux toiles. Dans la région de l'entrefer de formation, le rouleau de tête d'au moins une des deux toiles est du type à courbure variable ou réglable. La courbure de la surface de ce rouleau est réglée de façon active depuis l'intérieur du rouleau. Ainsi, le profil de tension transversale de la toile guidée par le rouleau de tête est réglé et/ou les instabilités possibles de la toile sont éliminées, en particulier à l'endroit de l'entrefer de formation.

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