System and method for sheet measurement and control in...

D - Textiles – Paper – 21 – F

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D21F 9/00 (2006.01) D21F 1/00 (2006.01) D21F 7/00 (2006.01) D21G 9/00 (2006.01)

Patent

CA 2329935

An array of sensors that are positioned underneath the wire of a paper making machine are employed to measure the conductivity of an aqueous wet stock. Conductivity of the wet stock is directly proportional to the total water weight within the wet stock; consequently, the sensor provides information used to monitor and control quality of paper sheet produced. CD water weight profile is obtained practically instantaneously and the MD and CD variations are essentially decoupled. Quality improvements to the sheet fabricated are achieved by providing fast control of the actuators and by tuning components to eliminate sources of variations. Dry stock weight of wet stock sheet resting on a water permeable moving wire can be measured employing a water weight sensor element positioned adjacent to the wire generating signals indicative of water weight of the sheet. The moisture level CD profile of a sheet of material can also be measured.

Il est possible d'apporter des améliorations significatives à la commande d'une machine à papier en utilisant un réseau de détecteurs placés sous la toile mesurant la conductivité de la pâte aqueuse grasse, laquelle est directement proportionnelle au poids total de l'eau contenue dans ladite pâte. Ainsi le détecteur fournit des informations pouvant servir à suivre et régler la qualité de la bande de papier produite. Comme le profil transversal du poids de l'eau est obtenu pratiquement instantanément, les variations selon le profil longitudinal et le profil transversal sont quasiment découplées. Les améliorations de la bande fabriquée résultent de la rapidité de commande des vérins de la machine et d'un ajustage de ses éléments qui éliminent les sources de variations. De plus, le poids de la pâte sèche d'une bande de pâte aqueuse grasse reposant sur la toile perméable mobile de la machine peut être obtenu à l'aide d'un détecteur de poids d'eau jouxtant ladite toile et produisant des signaux indiquant le poids d'eau de la pâte aqueuse grasse sur la toile. On peut en outre, mesurer le taux d'humidité selon le profil transversal sur une bande en cours de production.

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