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Blogmaster: Dr. David Roisum

Entries for 'David Roisum'

21
Interweaving Sucks
People have observed that once slit lanes cross each other, even momentarily, and particularly when they double up on a wound roll, that the trouble doesn’t want to clear itself.  This can happen most generally when a trim crosses over into the winding roll.  On an axial winder, such...

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17
Wishful Thinking –  Winding Taper and TNT’s
Continuing the theme of the previous post, we now turn to an even stickier bit of wishful thinking.  That is, the desire/hope/wish/belief/etc that winding defects can be cured (to everyone’s satisfaction) or at least noticeably remedied by changing the winder TNT (Tension, Nip, Torque) cu...

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15
Wishful Thinking – Tension and Wrinkling
Getting stuck in problem solving is epidemic.  We get stuck on wishful thinking, optimism, hope and a host of other ‘positive’ attitudes.  Now, don’t get me wrong, I am not suggesting that these traits are necessarily bad, only that they can be when you get stuck in a rut...

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13
Cooling Rubber Covered Rollers and School
Metso’s Up and Running E-news has another roller related article.  This one is on Guidelines for Internal Water Cooling of Rubber Covered Rolls.  While it is considered tasteless to critique an article when you yourself have not written anything better (or at all) on the subject, I o...

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09
What should be the unwinding tension for 12 micron PET film and for 30 micron Polyethylene film.  Please give me the formula for calculating the rewinder tension for the laminate. I will use page 5.10 from the 2010 version of the Web101 notes.  I apologize for the mixed units, but we will...

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07
We recently encountered customer complaint regarding roll telescoping.  Presently, we have the same tension settings for two different types of foil that have different roughness values. Would you recommend a higher or lower rewind tension for smoother foil surface (less roughness value)? Whil...

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02
Reasonable But Wrong 2
Orderly boarding of airplanes speeds up the process, or not? http://articles.latimes.com/2011/jun/27/business/la-fi-travel-briefcase-20110627 Don't be swayed by science by consensus and certainly not by hunches.  The reasonable ones are the most beguiling and perhaps need a second critical ...

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31
Tension Guidelines
Respected sir, I came upon a TAPPI standard that tension should be 10-25% of yield strength. 1. Is there any scientific rule to setting these value or are they heuristic? 2. What rule shall we follow in printed electronics industry? I am especially interested in the allowed variation fro...

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27
PFFC Magazine - Phoenix Rising
It’s said that bad news travels fast. Conversely, I’m hoping the great news that PFFC is back will travel at lightning speed. Many learned of the decision In late August 2011 that Penton Media had decided  to cease publication of Paper, Film & Foil Converter (PFFC). The great n...

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26
The Optimum Component Repair Time
From the previous post we noted that nearly everyone has an idea of the costs of maintenance.  (We used cover grinding as an example, but the application is much wider than this).  The more frequently you grind the greater the maintenance costs.  If that is the only cost management ha...

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Blogmaster

David Roisum photo

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.