Calendering method and a calender that makes use of the method

Details Calendering method and a calender that makes use of the method Calendering method and a calender that makes use of the method

D - Textiles, Paper

21

G

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

Patent

CA 2285291

The invention concerns a calendering method, in which the material web (W) to be calendered, in particular a paper or board web, is passed through the calender, in which at least one calendering nip (N) is formed by means of two rolls (12A, 12B) provided with resilient roll coatings (13A, 13B). The rolls (12A, 12B) are loaded towards each other so that, owing to the resilient nature of the roll coatings (13A, 13B), the nip (N) between the rolls (12A, 12B) becomes an extended nip. A flexible calendering belt (15A, 15B), which is non-compressible in comparison with the roll coatings (13A, 13B), which has been formed into an endless loop by means of alignment or reversing rolls (14A, 14B) or of equivalent rolls, and which runs through the nip, is passed over the calendering rolls (12A, 12B) provided with resilient roll coatings (13A, 13B) at each side of the nip (N). The invention also concerns a calender that makes use of the method.

L'invention concerne un procédé de calandrage, selon lequel la bande de matériau (W) destinée à être calandrée, notamment une bande de papier ou de carton, traverse la calandre. Celle-ci présente au moins une pince de calandrage (N) formée par deux rouleaux (12A, 12B) comportant des revêtements résilients (13A, 13B). Les rouleaux (12A, 12B) sont amenés l'un vers l'autre de façon que, de par la nature résiliente de leurs revêtements (13A, 13B), la pince (N) qu'ils forment s'allonge. Une courroie de calandrage flexible (15A, 15B), qui n'est pas compressible par comparaison avec les revêtements (13A, 13B) des rouleaux, qui se présente sous la forme d'une boucle sans fin grâce à des rouleaux d'alignement ou d'inversion (14A, 14B) ou à des rouleaux équivalents, et qui traverse la pince, passe par-dessus les rouleaux de calandrage (12A, 12B) comportant des revêtements résilients (13A, 13B) de chaque côté de la pince (N). L'invention concerne également une calandre utilisant ledit procédé.

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