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Web Handling & Converting

Blogmaster: Dr. David Roisum


The recommended taper program you mentioned in your new winding book Fig 1.6, is very effective. Wow, after almost 5 years, telescoping is now gone. The book he is referring to is Winding: Machines, Mechanics and Measurements, ed.

It is grateful to see people break away from the largely unhelpful discussion of the constant tension or constant torque or other ‘magic’ curves and start letting the wound roll tell us how to program the tension. I wish taper had never been invented because we are saddled with a confusion brought on by a strategy that was easy to program, but very non-intuitive and, more importantly, not as effective for solving the most common types of telescoping, Type 1A (core supported winding) and Type 1B (unwinding).

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#52 Jimmy
Friday, December 10, 2010 8:14 PM
Aside from the book and understanding, you need a tension control capable of doing a non-linear taper curve. The one we have is to set the diameter with corresponding percentage of taper up to 4 distinct roll diameter.
Diameter 1 = 156 mm = 100 % taper - -- tension is constant up to the next diameter set.
Diameter 2 = 300 mm = max. slip = 60% taper --when the roll diameter reach this point, the tension will start to taper up to the next setting or maximum diameter set. Hope this gives you additional idea how i did it. Wow it really works Dave. By the way, i also reduce my original tension so that the pressure on the outside is still lower than the inside.

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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.

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