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Web Handling & Converting

Blogmaster: Dr. David Roisum

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Slitting

21

Interweaving Sucks

Posted by David Roisum on February 21, 2012
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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Posted in: Slitting, Spreading, Winding
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12

Narrow (or is it) Web Handling

Posted by David Roisum on January 12, 2012
I am thinking of signing up for your course.  Does web handling apply to narrow webs? Narrow webs are sometimes defined as less than 1 meter wide.  Most web-handling directly applies to narrow webs.  A few exceptions occur on the narrowest of the narrow, i.e., ribbon-like materials.&...

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Posted in: Design, Nips, Slitting, Spreading, Tension/Drive Control, Winding, Wrinkling & Flatness
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22

Width Variations - Affect of Tension

Posted by David Roisum on June 22, 2011
How much can tension variations, such as the difference between two measurement points (supplier vs customer) affect widths? Let us take a really well known material, newsprint, though other paper grades and stiff films will be similar. Newsprint breaks at about 1% strain. Thus you might run tens...

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Posted in: Materials, Slitting
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21

Width Variations - Slit Width

Posted by David Roisum on June 21, 2011
How close are commercial slit width tolerances? Well, it varies enormously. However, the garden-variety medium width roll in the paper or film industry might be sold with something like +/- 1/32” tolerances. This might be expressed differently like +0 to -1/16 on a nominal size. Of course,...

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Posted in: Slitting
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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.