Method and assembly for opening calender nips

Details Method and assembly for opening calender nips Method and assembly for opening calender nips

D - Textiles, Paper

21

G

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

Patent

CA 2385263

The present invention relates to a method and assembly for opening the nips (9, 10) of a calender comprising at least two elements (1, 2; 3, 4) brought to a nip contact with each other, especially for performing the nip opening at a break or damage occurring in the web (5) being calendered. The tension of the web (5) being calendered is measured at multiple points over the cross-machine width of the web (5) and the calender nips (9, 10) are opened when the measured web tension at a preset number of points over the cross-machine width of the web (5) has fallen to a limit value that by a decision-making algorithm monitoring the tension profile of the web (5) is interpreted to indicate a web break situation or other damage on the web (5) requiring opening the nips (9, 10).

La présente invention porte sur un procédé et un ensemble d'ouverture des lignes de pincement (9, 10) d'une calandre. Cet ensemble comprend au moins deux éléments (1, 2 ; 3, 4) mis en contact par rapport à une ligne de pincement, notamment en vue de laisser un intervalle entre cylindres au niveau d'une cassure ou détérioration survenant dans la bande lors du calandrage. La tension de la bande soumise au calandrage est mesurée au niveau de plusieurs points sur sa largeur sens travers, et les lignes de pincement (9, 10) de la calandre sont ouvertes lorsque la tension de la bande mesurée au niveau d'un nombre prédéfini de points, sur sa largeur sens travers, est tombée à une valeur limite qui, par un algorithme de décision surveillant le profil de tension de la bande (5), indique une situation de cassure de la bande ou autre détérioration nécessitant l'intervalle (9, 10) entre cylindres.

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