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RESEARCH PAPERS

Theoretical and Experimental Investigations Into Spacing Characteristics Between Roller and Three Types of Webs With Different Permeabilities

[+] Author and Article Information
H. Hashimoto

 Tokai University, 1117 Kitakaname, Hiratsuka-shi, Kanagawa-ken 259-1292, Japanhiromu@keyaki.cc.u-tokai.ac.jp

M. Okajima

 Tokai University, 1117 Kitakaname, Hiratsuka-shi, Kanagawa-ken 259-1292, Japan

J. Tribol 128(2), 267-274 (Oct 06, 2005) (8 pages) doi:10.1115/1.2164463 History: Received February 25, 2004; Revised October 06, 2005

A new theoretical model for estimating the entrained air film thickness between a web and roller is presented for both impermeable and permeable webs. A simple curve fit formula for estimating the air film thickness, which considers the effects of air leakage from the web edges and air diffusion due to the permeability of web, was obtained based on a large number of simultaneous numerical solutions of the compressible Reynolds equation and the web equilibrium equation. The variation of air film thickness with roller velocity is measured for three typical webs: polyethylene terephthalate, coated paper, and newsprint. The effects of web permeability, web width, and web tension on the air film thickness are examined theoretically and experimentally for a wide range of roller velocity. Reasonable agreement is seen both quantitatively and qualitatively between the predicted and measured results. The validity of the formula for the first-order estimation of web-roller interface problems is verified experimentally.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Example of web transportation systems (papermaking machine)

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Figure 2

Foil bearing model for web-roller interface

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Figure 3

Flow chart of calculation procedure of nondimensional pressure distribution and air film thickness

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Figure 4

Numerical results of nondimensional pressure distribution and air film thickness for β=9.0

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Figure 5

Numerical solution of nondimensional air film thickness (valid for β>6)

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Figure 6

Approximation of air film thickness in the central region

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Figure 7

Air diffusion model for permeable web

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Figure 8

Overview of test rig

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Figure 9

SEM image for surface topography of tested papers

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Figure 10

Air film thickness distribution in the web transporting direction

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Figure 11

Variation of air film thickness with roller velocity (PET)

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Figure 12

Variation of air film thickness with roller velocity (coated paper)

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Figure 13

Variation of air film thickness with roller velocity (newsprint)

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