Method for calendering

D - Textiles – Paper – 21 – G

Patent

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Details

D21G 1/00 (2006.01) D21G 1/02 (2006.01) D21G 9/00 (2006.01)

Patent

CA 2387377

The present invention relates to a method for calendering a moving web (1) of paper or board. The web (1) is passed to a calender (2) and calendered therein. At least one quality of the calendered web (1) is measured at a first measurement point (3) adapted at a location downstream from the calender (2). Additionally, at least one quality of the web (1) entering the calender (2) is measured at a second measurement point (4) adapted at a location between the calender (2) and the preceding section of the line. A control variable (6) affecting the calendering effect on the calender (2) is controlled by a feedback control scheme based on the measurement result obtained from said first measurement point (3) and a control variable (9) affecting the processability of the web (1) to be calendered is controlled by a feedback control scheme based on the measurement result obtained from said second measurement point (4).

La présente invention concerne un procédé de calandrage de papier ou de carton sous forme d'une bande en déplacement (1). La bande (1) est passée dans une calandre (2) et subit un calandrage. On mesure au moins une caractéristique de la bande calandrée (1) à un point de mesure (3) disposé en aval de la calandre (2). En outre, on mesure au moins une caractéristique de la bande (1) entrant dans la calandre (2) en un second point de mesure (4) disposé entre la calandre (2) et la section précédente de la ligne. Une variable de contrôle (6) agissant sur l'effet de calendrage de la calandre (2) est pilotée par un schéma de commande en retour basée sur le résultat de la mesure obtenu au premier point de mesure (3), et une variable de contrôle (9) concernant la transformabilité de la bande (1) à calandrer est pilotée par un schéma de commande en retour basé sur le résultat de la mesure obtenu au second point de mesure (4).

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