Method and arrangement for computing and regulation of the...

D - Textiles – Paper – 21 – G

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D21G 1/00 (2006.01) D21G 9/00 (2006.01)

Patent

CA 2288264

The invention concerns a method and an arrangement for computing and regulation of the distribution of linear load in a multi-nip calender. The material web (W) is passed through the nips (N1...N9) in the set of rolls (12), which set of rolls comprises a variable-crown upper roll (13), a variable-crown lower roll (14) and intermediate rolls (15...22) fitted between the upper and lower rolls (13, 14). All the rolls in the set of rolls are supported so that, when the nips (N1...N9) are closed, the bending lines of the rolls are curved downwards. In the computing and regulation of linear loads, the physical properties affecting the bending of each intermediate roll (15...22) under load, such as bending rigidity, mass, shape, and material properties, are taken into account. The ratio of the linear loads applied to the intermediate rolls (15...22), the own weight of the rolls, and of the support forces applied to the rolls is regulated so that the set of rolls is in a state of equilibrium and in a predetermined state of deflection. The invention also concerns a multi-nip calender that carries out the method.

L'invention concerne un procédé et un système permettant de calculer et de réguler la distribution de charge linéaire dans une calandre à multiples pinces. La bande de matériau (W) passe à travers les pinces (N1...N9) dans l'ensemble des rouleaux (12), ledit ensemble comprenant un rouleau supérieur (13) à bombé variable, un rouleau inférieur (14) à bombé variable et des rouleaux intermédiaires (15...22) placés entre les rouleaux supérieur et inférieur (13, 14). Tous les rouleaux dans l'ensemble de rouleaux sont supportés de façon à ce que, lorsque les pinces (N1...N9) sont fermées, les lignes de courbure des rouleaux soient incurvées vers le bas. Lors du calcul et de la régulation des charges linéaires, les propriétés physiques influençant la courbure de chaque rouleau intermédiaire (15...22) sous l'effet de la charge, telles que la raideur de courbure, la masse, la forme et les propriétés matérielles, sont prises en considération. Le rapport des charges linéaires appliquées aux rouleaux intermédiaires (15...22), du poids des rouleaux et des forces de support exercées sur les rouleaux est régulé de façon à ce que l'ensemble des rouleaux se trouve dans un état d'équilibre et dans un état prédéterminé de fléchissement. L'invention concerne également une calandre à multiples pinces permettant de mettre en oeuvre le procédé.

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