Web instability in the open draw and the impact on paper machine efficiency, TAPPI Journal May 2022



Application: Measurement of the release point of the web from a press roll can be used to identify tension stability problems in the open draw and the source of web breaks. Paper machine drive stability and the web adhesion to the press roll surface are possible problem areas.

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Author: Frédéric Parent, Daniel Ricard, J. DAvid McDonald, and Richard J. Kerekes
Web instability in the open draw and the impact on paper mac
ABSTRACT: Paper is most likely to break in the first open draw on a paper machine where it is unsupported, wettest, and weakest. Tension is applied to peel the web from the roll surface, as well as minimize web flutter in the open draw. The average tension is well below the breaking point and is often set by adjusting the speed difference between the press and the next machine element by visually observing the behavior of the web. However, machine direction variations caused by instabilities in the paper machine can cause tension swings that exceed the strength of the web. Measurement of the web’s release point from press rolls on pilot and commercial paper machines was used to identify the cause of tension instabilities. Variations in the speed of the paper machine drives and the work of adhesion from the press roll surface were identified as key factors. Fluctuations of paper moisture, which affects the elastic modulus and strength of the web, appear to be less important.
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