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Web Handling & Converting

Blogmaster: Dr. David Roisum

15
If a picture is worth a thousand words, a video must be worth a million then.  Tipping a roller  (specifically in-plane bending misalignment) will steer the web to conform to the normal entry law, which is only valid in traction.  The amount of steering can be calculated by the method...

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10
A common defect found in web processing is marks such as scratches and dents from contact with something hard such as a roller.  Diagnostics can be straight-forward in some cases, but can require math moxie in others.  I can not recall web marking ever being the subject of a paper. &n...

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08
Concave Roller Spreading Video
One of the best-modeled of the spreader types is extremely difficult to teach.  It requires the superposition of about a half-dozen mechanics steps to explain.  I have long ago given up because few of my students remember their engineering mechanics if they ever even had it.  So, inst...

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05
I make the rounds talking to a variety of groups.  This time it will be on ‘Solutions for Winding Nonwovens’ for INDA’s Converting and Bonding Conference May 6-8 in Greenville SC.  I look forward to this for a couple of reasons.  There is a tendency for all industry ...

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03
Looking back is often a good way to look forward.  My earth orbit view of web handling troubles of greatest note fall into the following categories: (web and machine) product design maintenance (and sometimes design) issues such as roller alignment and tension (and nip) control c...

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01
Do Spirals Spread?
One of the most longstanding debates in our industries is whether spiral grooving spreads.  Those who follow my work closely will know the answer and reasoning.  For the rest of you, see for yourselves.  This is one of my favorite YouTube clips to date.  No April Fool's here, I a...

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27
Far be it for me to tack away from taboo topics.  I am also not one to offer answers when I have none.  Just a few observations.  Women make up 20% of the current undergraduates in engineering in the US.  It similar in Canada and Europe.  However, in web handling (ditto web ...

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25
The ability or lack thereof of a dancer to absorb upstream tension fluctuations has been the topic of much debate and misunderstanding.  Here, I hope once and for all, to clarify the answer: under certain special conditions but don’t count on it for everyday tension troubles; and the reas...

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20
… wound rolls of my metallized BOPP are too tight … There are four parts to the total tightness that might be seen on BOPP and similar products:  the TNT (tension, nip, torque) settings of the winder, thermal shrinkage, the shrinkage due to post extrusion secondar...

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18
The motivation and methods to calibrate dancers are precisely the same as load cells; even though there are cultural backwaters of machine design/operation where this is still not being done.  Find out how.  Link and transcript to the vlog is given below. Web201.16b Dancer Calibrati...

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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.

Converting School

Dr. David Roisum's
Upcoming Classes
Sep 09 - 10, 2014 - Brussels, Belgium
Web Handling and Converting
Sep 11 - 12, 2014 - Brussels, Belgium
Winding: Machines, Mechanics and Measurements
Nov 04 - 05, 2014 - Charlotte, NC
Web Handling and Converting
Nov 06 - 07, 2014 - Charlotte, NC
Winding: Machines, Mechanics and Measurements

View the entire AIMCAL Converting School 2013 class schedule »