Method in the calendering of a paper web and a calender that...

D - Textiles – Paper – 21 – G

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D21G 1/00 (2006.01)

Patent

CA 2225956

The invention relates to a method in the calendering of a paper web, wherein the paper web (W) is passed through a calendering nip (N) formed by two rolls (11, 12). Of the nip rolls at least one roll (12) has been made soft-faced by means of a coating (13) of a polymer or equivalent material or by means of a band passed over said roll and running through the nip (N). The profile of the calendering nip (N) is regulated in order to compensate for any flaws present in the web (W) entering the calender (10), and in the invention the regulation of the profile is carried out during the running of the machine by varying the properties of the coating (13) or, correspondingly, of the band on the soft- faced roll (12) locally in a direction transverse to the machine direction. Preferably, the properties of the coating (13) or the band are varied by means of heat. The invention also relates to a calender that makes use of the method.

Procédé de calandrage d'une bande de papier, qui consiste à faire passer une bande de papier (W) dans la ligne de contact (N) formée par deux rouleaux (11, 12). La surface d'au moins un (12) de ces deux rouleaux a été rendue molle au moyen d'un revêtement polymère ou d'une matière équivalente, ou au moyen d'une bande passée sur ledit rouleau et parcourant toute la ligne de contact (N). Le profil de la ligne de contact (N) est régulé afin de compenser les défauts présents dans la bande (W) qui entre dans la lisse (10). Selon la présente invention, on régule le profil pendant le fonctionnement de la machine en modifiant les propriétés du revêtement (13) ou, de manière correspondante, de la bande placée sur le rouleau (12) à surface molle localement dans un sens transversal par rapport au sens de la machine. De préférence, on a recours à la chaleur pour modifier les propriétés du revêtement (13) ou de la bande. La présente invention concerne également une lisse utilisant ledit procédé.

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