System for overall control of the different transverse...

Details System for overall control of the different transverse... System for overall control of the different transverse...

D - Textiles, Paper

21

F

D21F 7/06 (2006.01) D21G 9/00 (2006.01)

Patent

CA 2167292

A method for the control of the transverse profiles of a web (W) manufactured by means of a machine for the manufacture of a web material, such as a board or paper machine, and/or treated by means of a finishing machine. In the method, the transverse caliper and grammage profiles (cp, bp) and/or the moisture profile of the web (W) is/are measured. The actuators (44, 54, 47, 47a, 47b) acting upon said profiles are regulated by means of these signals (m3, m4) of measurement. In view of optimizing the quality of the web (W) to be produced, the reel formation and the runnability of the machine, in the method, the transverse tension profile (tp) of the web (W) to be manufactured and/or treated is measured. Based on the measurement of the tension profile (tp), set profiles (S2, S3, S4) are formed, by whose means one or several actuators (12, 13, 14; 36, 44, 54, 61) of the profile regulation are controlled.

L'invention concerne un procédé permettant de réguler les profils transversaux d'une bande (W) produite au moyen d'une machine destinée à produire une bande de matériau, telle qu'une machine à carton ou à papier, et/ou traitée au moyen d'une machine de finition. Selon le procédé présenté, les profils d'épaisseur et de grammage transversaux (cp, bp) et/ou le profil d'humidité de la bande (W) est/sont mesuré(s). Le fonctionnement des actionneurs (44, 54, 47, 47a, 47b) agissant sur ledits profils est régulé au moyen de signaux (m¿3?, m¿4?) de mesure correspondant. En vue d'améliorer au maximum la qualité de la bande (W) à produire, la formation du rouleau de papier et l'aptitude au fonctionnement de la machine, il est prévu, selon le procédé présenté, que le profil de tension transversale (tp) de la bande (W) à produire et/ou traiter soit mesuré. A partir de la mesure du profil de tension (tp), des profils de consigne (s¿2?, s¿3?, s¿4?) sont determinés, et un ou plusieurs actionneurs (12, 13, 14; 36, 44, 54, 61) servant à la régulation des profils sont commandés en fonction desdits profils de consigne.

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