Apparatus and method for pressing a paper web

Details Apparatus and method for pressing a paper web Apparatus and method for pressing a paper web

D - Textiles, Paper

21

F

D21F 3/02 (2006.01)

Patent

CA 2392517

A press device with an extended press nip for pressing of a continuous paper or paperboard web comprises a press shoe, a backing member, a support, and a plurality of loading cylinders with main axes in their longitudinal directions. The press shoe can be moved between different positions. A stop member is arranged downstream of the press shoe for transfer between and fixation at different stop positions in the machine direction. At least some of the loading cylinders or the support comprise members eccentrically arranged with respect to one or some of the main axes, which members can be brought into different eccentric positions with respect to the main axes. The eccentric position and the stop position controls the position of the press shoe during the pressing, and thereby the pressure curve.

L'invention se rapporte à un dispositif de pressage ayant une ligne de contact étendue, conçu pour presser une bande continue de papier ou de carton. Ledit dispositif de pressage comporte un sabot de pressage, un élément de renfort, un support et une pluralité de cylindres de chargement ayant leur axe principal disposé longitudinalement. Le sabot de pressage peut être déplacé entre différentes positions. Un élément d'arrêt est disposé en aval du sabot de pressage de manière à être déplacé entre différentes positions d'arrêt et à être fixé au niveau desdites positions dans le sens machine. Certains au moins des cylindres de chargement ou le support comportent des éléments disposés de manière excentrique par rapport à l'un ou à plusieurs des axes principaux. La position excentrique et la position d'arrêt permettent de commander le positionnement du sabot de pressage lors du pressage, et par conséquent la courbe de pression.

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