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How NOT to Cook Bearings

Posted by David Roisum on June 13, 2011

There are at least three concerns with bearings that must operate at high temperatures.  The first, and probably the easiest, is that the steel must be durable and stable at those temperatures.  The second is that the acceptable fits between the outer race and the housing as well as between the inner race and the shaft become narrower at elevated temperatures because the expansion rates are not identical.  However, the third consideration is perhaps the most challenging of all; selection of appropriate lubricants that work well over the range of temperatures the equipment will see between a cold startup and a hot run.  The May 2011 issue of the Pulp and Paper International Magazine does a nice job of filling in the details with its Rolling Bearings – Life at High Temperature.  This is the second web handling related article in this issue !

Posted in: Design, Maintenance, Rollers
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Dr. David Roisum

Dr. Roisum is a well-known authority in the area of web handling and converting. He has authored seven books, including Winding, Rollers and Web-Handling and has coauthored or edited several others. He was a technical editor for Converting Magazine with a monthly column entitled "Web Works." An accomplished professional speaker and instructor, Roisum has been praised for his skill at translating highly technical information into a common sense practical reference. Dave has been honored by TAPPI with their Finishing & Converting Division Award, Thomas W. Busch Prize and Finest Faculty awards and is a TAPPI Fellow. Dave received his Ph.D. from the Web Handling Research Center where he later became an Industrial Advisory Board member.

Dave has worked for the Beloit Corporation as a designer of winding machinery and later as a manager of research, and for Kimberly-Clark as a converting expert serving all business units. He is now a principal of Finishing Technologies Inc., providing consulting services to more than 300 clients who convert or manufacture: paper, film, foil, nonwovens, textiles and many other materials. He has accumulated much practical experience working in nearly 1,000 plants over the course of more than three decades.