Curl Estimation in Multi-Ply Paperboard

摘要

This paper describes a grey box model for the curl and twist of the carton board produced at AssiDom?anrnFr?ovi, Sweden. The main equations are based on classical lamination theory of composite materials, andrneach constituent ply is considered as a macroscopic homogeneous, elastic medium. The model used datarnfrom June to September 2004, and shows a general agreement between predicted and measured curvatures.rnRegularization and backwards elimination were used to cope with the low identiˉability of the problem. Thernmodel was then complemented with a sub-model of immeasurable/unmodelled disturbances estimated withrnan extended Kalman ˉlter.