Air Film Thickness Estimation in Web Handling Processes

[+] Author and Article Information
Hiromu Hashimoto

School of Engineering, Department of Mechanical Engineering, Tokai University, Kanagawa, Japan 259-12

J. Tribol 121(1), 50-55 (Jan 01, 1999) (6 pages) doi:10.1115/1.2833810 History: Received March 06, 1998; Revised May 15, 1998; Online January 24, 2008


In this paper, in order to estimate an air film thickness between moving web and guide roller (web spacing height), an air film thickness formula was derived based on the finite width compressible foil bearing theory. In the derivation of the air film thickness formula, the two-dimensional Reynolds equation and foil equilibrium equation were discretized by the finite difference method and solved iteratively to obtain the pressure and air film thickness distributions for various parameters. Based on the numerical results, the simplified convenience formula for the estimation of air film thickness between web and guide roller was obtained. On the other hand, the air film thickness between web and guide roller was measured by an optical sensor, and the experimental results were compared with the calculated results. Moreover, the variation of air film thickness between two layers in web winding processes was analyzed by making use of the air film thickness formula derived above. From the theoretical and experimental results obtained, the effects of air film thickness on the web transporting systems were clarified.

Copyright © 1999 by The American Society of Mechanical Engineers
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