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Abstract
In the paper-web transportation systems, the moving web and rotating roller bring the surrounding air between web and roller due to viscosity. As a result, the web-roller interface behaves as the self-acting foil bearings, and it causes a decrease of traction between the web and the roller. Increasing the air film thickness more than the asperity heights of web and roller surfaces, the available traction is nothing more than the fluid film friction which is actually equivalent to the zero-friction. As a decrease in traction in a direct result of air entrainment between web and roller, it is important to predict the friction coefficient including the effects of air film for controlling the traction in many web applications. In this paper, the friction model between paper-web and roller is presented with experimental verifications.
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