IDENTIFICATION OF CROSS-DIRECTIONAL BEHAVIOR IN WEB PRODUCTION - TECHNIQUES AND EXPERIENCE

The paper concerns the problem of parameter estimation in web manufact uring processes such as paper making, plastics extrusion and sheet coa ting processes. The key feature of such processes is that the manufact ured web has width and length. In order to control or monitor the proc ess, it is necessary to be able to identify the behaviour of the web w idth (cross-direction, in short CD) as well as the web length (machine -direction, in short MD). The aim of the paper is: (1) to review the i dentification techniques, (2) present a new method based upon basis fu nction sets, (3) to illustrate typical results using industrial data.