Headbox for paper machine

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 1/02 (2006.01) D21F 1/06 (2006.01)

Patent

CA 2571987

An object of the present invention is to provide a headbox for a paper machine in which correction of the fiber orientation of paper is possible over the entire width of the C/D direction, regardless of the slice width, and in which the fiber orientation in the direction of paper thickness can be corrected over the entire thickness of the paper. A headbox (1) for a paper machine according to claim (1) of the present invention discharges paper raw material onto a wire as a raw material jet gj from a slice (5) which is supplied with the paper raw material, and comprises orientation correcting means (h3) for correcting the pulp fiber orientation by supplying paper raw material, which is extracted from a taper header (2) in which paper raw material for a main flow is stored, or from a correction-only taper header (2s) in which paper raw material for correcting the pulp fiber orientation is stored, as a correction flow to a single location in a central portion of the slice (5) via at least one flow control valve (b3).

La présente invention concerne notamment une caisse de tête pour machine à papier dans laquelle les fibres du papier peuvent être orientées transversalement sur toute la largeur, indépendamment de la largeur de la règle, et dans laquelle l'orientation des fibres dans le sens de l'épaisseur du papier peut être corrigée sur toute l'épaisseur du papier. Selon la revendication (1) de la présente invention, la caisse de tête (1) pour machine à papier décharge la matière première pour papier sous forme d'un jet gj partant d'une règle (5) fournie avec la matière première, et comprend des moyens de correction (h3) permettant de corriger l'orientation des fibres de la pâte à papier extraite d'une tête à sortie conique (2) -flux principal - ou bien une tête à sortie tronconiuqe pour correction seule (2s) dans laquelle est stockée la matière première de papier destinée à corriger l'orientation des filbresflux correcteur - vers un emplacement unique dans la partie centrale de la règle (5) via au moins une soupape de commande de débit (b3).

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