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Author: James K. Good and Joseph A. Beisel
Calculations relating to web buckling resulting from roller
ABSTRACT: Buckling of paper, film, and textile webs within process machinery can cause vari-ous problems, including ruptures, that result in lost productivity, coating defects, and reduced web quality. Earlier Gehlbach et al. [1] demonstrated that mathematical expressions of plate instability could be applied to thin webs such as paper that have small but finite plate bending stiffness. In this paper we revisit the subject and expand the theory to encompass the orthotropic properties of many webs. We also examine the effects of web shear stiffness, web tension, and the traction between webs and rollers on troughs and wrinkles. We developed generalized expressions for the levels of roller misalignment that induce web buckling. These expressions can be used to determine what levels of misalignment are acceptable in each span of a process machine for a given web material.
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