Method and device for pulp web formation

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 1/00 (2006.01) D21F 1/48 (2006.01) D21F 9/00 (2006.01) D21F 11/00 (2006.01)

Patent

CA 2351490

The invention relates to a method and an apparatus for pulp web formation. The method comprises feeding pulp, having a dry content of about 1,5 %, from a headbox (2) into a wedge-shaped converging space (5) defined by two wires (3, 4) or the like, said wires or the like being supported on chamber units (6, 7), including at a given time at least one water-receiving chamber (8), having its pressure adjustable in such a way that the pulp can be maintained at an overpressure in the space (5). The method comprises increasing the dry content of the pulp in the converging space (5) to a value which is at least about % to about 12 %. According to the invention, the method comprises subjecting the pulp present between the wires (3, 4) or the like in the downstream section of the converging space, or in its substantially immediate vicinity, to a compression in perpendicular direction (z direction). In the method, the compression performed in the vicinity of the converging space (5) or its downstream section is used for increasing the dry content of the pulp to a value which is at least about 18 %, preferably to a value which is about 20 %.

La présente invention concerne un procédé et un dispositif destiné à la formation d'une âme de pâte à papier. Le procédé comprend une pulpe d'alimentation, laquelle possède un contenu sec d'environ 1,5 %, passant d'un tambour (2) à un espace de convergence en forme de coin (5) défini par deux fils (3, 4) ou éléments semblables, lesdits fils portant sur des chambres (6, 7), comprenant à un moment donné au moins une chambre recevant de d'eau (8), dont la pression est ajustable de telle façon que la pulpe puisse être maintenue en surpression dans l'espace(5). Le procédé consiste à augmenter le contenu sec de la pulpe dans l'espace de convergence (5) à une valeur d'au moins environ 10 à 12 %. Selon l'invention, le procédé consiste à soumettre la pulpe contenue entre les fils (3, 4) ou les éléments semblables dans la section de flux descendant de l'espace de convergence, ou dans ses abords sensiblement immédiats, à une compression dirigée perpendiculairement (sens z). Dans le présent procédé, la compression appliquée dans les abords de l'espace de convergence (5) ou dans la section de flux descendant est utilisée de façon à augmenter le contenu sec de la pulpe jusqu'à une valeur qui se monte au moins à environ 18 %, et de préférence à environ 20 %.

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