Method and apparatus for executing grade change in paper...

D - Textiles – Paper – 21 – F

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D21F 7/00 (2006.01) D21F 11/00 (2006.01) D21G 9/00 (2006.01)

Patent

CA 2296721

The invention relates to a method and an apparatus for executing a grade change in a paper machine, in which method a grade change is executed by determining, in advance, target ramps for different process variables, which are ramped according to said ramps during the grade change. Data about the grade changes already executed is collected, whereafter data about successful grade changes is selected and the grade change models to be used are determined on the basis of this data, and the target ramps are determined by means of these grade change models.

L'invention concerne un procédé et un appareil permettant de changer la qualité dans une machine à papier, le changement de qualité se faisant par détermination, à l'avance, des pentes cible pour différentes variables de traitement, lesquelles sont tracées en fonction desdites pentes pendant le changement de qualité. Les données sur les changements de qualité déjà exécutés sont rassemblées, suite à quoi les données sur les changements de qualité obtenus sont sélectionnées et les modèles de changement de qualité à utiliser sont déterminés sur la base de ces données, les pentes cible étant déterminées à l'aide de ces modèles de changement de qualité.

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