Conference proceedings article

Pressroom runnability : comprehensive analyses of pressroom and mill databases

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Subtitle: comprehensive analyses of pressroom and mill databases

Author list: Uesaka, Tetsu

Publisher: Pulp and Paper Technical Association of Canada

Publication year: 2005

Start page: C217

End page: 228

ISBN: 1897023081


Abstract

Web break is an important runnability issue in the pressrooms. However, web breaks are rare events. Performance statistics for a large number of rolls are required to determine the causes of runnability problems with a reasonable level of confidence. To provide better insight into the main causes of web breaks, we analyzed seven pressroom/mill databases of sufficient size to produce reliable runnability statistics. The statistical ""association"" between strength properties (average) and break rate was examined using a Chi Square analysis method. We found that the statistical ""association"" between strength properties (average) and break rate varied considerably from one pressroom to the other (or from one mill to the other), depending on the pressroom operation (the variations of tension) and the quality of data from mills. However, among different strength properties, MD tensile strength has been most consistently associated with the break rate. CD Tear strength did not consistently predict the runnability. We also found that strength uniformity had a significant impact on pressroom performance. Lastly, the pressroom data consistently showed that typical, macroscopic defects are now minority causes for web breaks and the majority of breaks are press-related or ""unknown"".


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