Method in the calendering of a paper or of an equivalent web...

D - Textiles – Paper – 21 – G

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D21G 1/00 (2006.01) D21G 1/02 (2006.01)

Patent

CA 2154479

The invention concerns a method in the calendering of a paper or of an equivalent web material. In the calender, the web material (W) to be calendered is passed through nips (N1...N9) formed by a variable-crown upper roll (13a), a variable-crown lower roll (14a), and by two or more intermediate rolls (15a...22a) arranged between said upper and lower rolls (13a, 14a). The rolls (13a...22a) are arranged as a substantially vertical stack of rolls (12a). As the intermediate rolls (15a...22a), such rolls are used in which the form of the natural deflection line produced by their own gravity is substantially equal. The nip load produced by the masses of the intermediate rolls (15a...22a) and of the auxiliary equipment (167a) related to same is relieved substantially completely in the method, and an adjustable load is applied to the calendering nips (N1...N9) by means of the variable-crown upper or lower roll (13a, 14a) and/or by means of an external load (143a) applied to the upper or lower roll. The invention also concerns a calender that makes use of the method.

Procédé de calandrage de papier ou d'un matériau en bande similaire. Dans les calandres, le matériau en bande (W) à calandrer passe à travers des lignes de pincement (N1 à N9) constituées par un rouleau supérieur à couronne variable (13a), un rouleau inférieur à couronne variable et deux, ou plus de deux, rouleaux intermédiaires (15a à 22a) disposés entre lesdits rouleaux supérieur et inférieur. Les rouleaux (13a à 22a) sont disposés de façon à constituer une pile sensiblement verticale (12a). Comme rouleaux intermédiaires (15a à 22a), on utilise des rouleaux tels que la forme de la ligne de déflexion naturelle due à leur propre gravité soit sensiblement égale. La charge des lignes de pincement résultant de la masse des rouleaux intermédiaires (15a à 22a) et des équipements auxiliaires (167a) qui leur correspondent est pratiquement éliminée entièrement du fait du procédé, et une charge ajustable s'applique aux lignes de pincement de calandrage (N1 à N9) par l'intermédiaire des rouleaux supérieur et inférieur (13a, 14a) à couronne variable et/ou par l'intermédiaire de charges extérieures (143a) appliquées aux rouleaux supérieur et inférieur. L'invention porte également sur une calandreuse utilisant ce procédé.

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