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On-line sensing of paper machine wet-end properties: dry-line detector

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3 Author(s)
A. P. Kjaer ; The Danish Steelwork, Frederiksvaerk, Denmark ; P. E. Wellstead ; W. P. Heath

This paper is concerned with the task of sensing in web-forming process control loops. Conventional and newly proposed measurement techniques are discussed and a new type of measurement is suggested. The new measurement method adresses the problem of paper machine “wet-end” sensing and is based on a CCD camera system which can detect the dry-line. Both the theoretical and practical aspects of the invention are investigated and the sensing system is developed into a portable measurement system which is applied to a paper machine. The paper machine measurements are analyzed and presented using nonparametric techniques based on analysis of variance. Compared to traditional scanning gauge systems the dry-line detector allows for a large reduction in the transport delay, higher data density and sampling rate, and better machine directional (MD), and cross-directional (CD) signal decomposition

Published in:

IEEE Transactions on Control Systems Technology  (Volume:5 ,  Issue: 6 )