The Effect of Web Permeability and Side Leakage on the Air Film Height Between a Roller and Web

K. S. Ducotey; J. K. Good

doi:10.1115/1.2834587

Journal of Tribology | Volume 120 | Issue 3 | Research Paper

< Previous Article Next Article >

RESEARCH PAPERS

The Effect of Web Permeability and Side Leakage on the Air Film Height Between a Roller and Web

K. S. Ducotey and J. K. Good

[+] Author and Article Information

K. S. Ducotey, J. K. Good

Web Handling Research Center, School of Mechanical & Aerospace Engineering, Oklahoma State University, Stillwater, OK 74078

J. Tribol 120(3), 559-565 (Jul 01, 1998) (7 pages) doi:10.1115/1.2834587 History: Received March 25, 1996; Revised April 20, 1997; Online January 30, 2008

Article

Citing Articles

Abstract

Air entrained between a web and roller can cause a loss in traction that can affect web quality. The entrained air causes an air layer to form which separates the web from the roller. Insufficient traction exists at this point and an idler roller will be unable to be driven by the web. Other applications, however, such as newsprint moving around a turnbar, require complete clearance. An equation for predicting the air film height between a permeable web and roller was developed using foil bearing theory. The separation distance (h) between the roller and web is a function of the roller radius (R), web tension (T), air viscosity (η), summation of the web and roller velocities (U), and the web permeability (α). The air film height was found to decrease linearly around the circumference (θ) of the roller in the constant pressure region. Therefore, the air film height can be expressed simply as,

h = 0.643R[(6ηU)/T] 2/3 -2[(αT)/U]θ

The slope of the air film height is a function of the web/roller velocity, web tension, and the permeability of the paper. A correction factor for side leakage was also incorporated into the result.

Purchase this Content

$25.00

Purchase

Learn about subscription and purchase options

Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Web of Science® Times Cited: 5

Some tools below are only available to our subscribers or users with an online account.

PDF
Email

You must be logged in as an individual user to share content.

Return to: The Effect of Web Permeability and Side Leakage on the Air Film Height Between a Roller and Web

Copyright in the material you requested is held by the American Society of Mechanical Engineers (unless otherwise noted). This email ability is provided as a courtesy, and by using it you agree that you are requesting the material solely for personal, non-commercial use, and that it is subject to the American Society of Mechanical Engineers' Terms of Use. The information provided in order to email this topic will not be used to send unsolicited email, nor will it be furnished to third parties. Please refer to the American Society of Mechanical Engineers' Privacy Policy for further information.
Share
Get Citation

Ducotey KS, Good JK. The Effect of Web Permeability and Side Leakage on the Air Film Height Between a Roller and Web. ASME. J. Tribol. 1998;120(3):559-565. doi:10.1115/1.2834587.

Download citation file:

RIS (Zotero)

EndNote

BibTex

Medlars

ProCite

RefWorks

Reference Manager

© Copyright
Get Alerts

Processing your request... Please Wait.

The Effect of Web Permeability and Side Leakage on the Air Film Height Between a Roller and Web

Abstract

References

Figures

Tables

Errata

Discussions

Related Content

Journals

Conference Proceedings

eBooks