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Blogmaster: Dr. David Roisum

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15

The Last Roller

Posted by David Roisum on December 15, 2011

The last roller is special.  It is right before the winding roll.  Because the winding roll has such crappy geometry, such as having diametral profile variations two orders of magnitude greater than a roller, it is just waiting to misbehave.  So, how to we give our web the best chance of making it into the wound roll and out the door without wrinkling?  The answer was given in the previous post:  kick in the flattening affect by employing the Shelton ‘Big and Slippery’ Law.  In this case, we might go one step further; that is to put a spreader just upstream of the big and slippery roller.  So the order of elements at the end of your machine is Spread, (Slit, Spread), Drum (big and slippery roller) and finally Wind (ing roll).  Note that this arrangement also provides the shortest total web path length between slitting (or trimming) and winding; that is necessary to make good looking roll edges.

Posted in: Design, Rollers, War Stories in Web Handling, Winding, Wrinkling & Flatness
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Comments

#308 panna lal jhawar
Tuesday, January 17, 2012 4:20 AM
Sir,
we would like to learm more about web handling and converting ....Can you help us
#309 David Roisum
Tuesday, January 17, 2012 10:53 AM
The cheapest and easiest way to learn web handling would be to subscribe to my Web101 as set of some 1,000 audio/slides on over 50 topics. You can listen to any and all subjects when you want/need. For example, you have foil so wrinkling and perhaps web breaks might be troublesome. You could look at just those two subjects. However, it is best to do the fundamentals first, modules 1-12. This is hosted by AIMCAL at https://www.aimcal.org/technical-resources/bookstore/categoryid/3/training-and-tutorials.aspx.

The fastest way to get a start on learning web handling would be to attend one of my classes hosted by AIMCAL, March and September, Chicago. Info at http://www.convertingschool.com/courses/course.asp?coursecode=WH1.

The hardest way, and also somewhat expensive, is to buy and read books. A list of my books is on my website, Roisum.com, and most are published by TAPPI PRESS. However, the Mechanics of Rollers as well as Winding Machines, Mechanics and Measurements are good reference books for those needing details.

Almost all of the articles I have written are posted on my website. Finally, there is the Roisum Library which is an (Excel) database, free for the asking, of nearly everything written on web handling related areas. The challenge here, sometimes, is to get the articles. Most libraries in the US can do this easily and for free, but you would have to make the effort and a couple of trips to get them.

If you have a large group, >5-10, the best and cheapest way to get training is to have me put on the course in your plant.

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Blogmaster

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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.