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Web Handling & Converting

Blogmaster: Dr. David Roisum

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Nips

03

High edges, narrow layon rollers and other confusion

Posted by David Roisum on May 3, 2012
Q: A colleague of mine recently stated that use of a lay-on or rider roller that is not as wide as the web is 'common practice'. He sees this as a form of 'winding optimization', whereas the word that I would use is more like 'accommodation'.  We are winding a delicate .001" thick film that is ...

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Posted in: Nips, War Stories in Web Handling, Web Manufacturing, Winding, Wrinkling & Flatness
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01

Air Entrainment - Symptoms

Posted by David Roisum on May 1, 2012
I was wondering if you had any suggestions or advice with regard to a ___ condition that gets worse as we increase line speed. A clear increase in 'air-like' troubles with speed is the fingerprint of air entrainment.  Very little else is needed to independently verify that root cause. ...

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Posted in: Nips, Problem Solving
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17

Wishful Thinking – Winding Taper and TNT’s

Posted by David Roisum on February 17, 2012
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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Posted in: Design, Nips, Problem Solving, Tension/Drive Control, Winding
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13

Cooling Rubber Covered Rollers and School

Posted by David Roisum on February 13, 2012
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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Posted in: Design, Maintenance, Nips, Rollers, Temperature/Moisture Effects
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18

Core Shaft Deflection

Posted by David Roisum on January 18, 2012
Is there a “rule of thumb” or guideline for allowable winding shaft deflection for in-line slitting?  I am talking to a converter that wants to in-line slit a heavy extrusion coated product on his turret winder, possibly up to 66” wound roll diameter.  Is it as simple as ...

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Posted in: Design, Nips, Rollers, Winding, Wrinkling & Flatness
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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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10

Crown Correction

Posted by David Roisum on January 10, 2012
My venerable Mechanics of Rollers book has a couple of omissions that I have long regretted.  They are both, fortunately, nicely published in Metso’s Up and Running web page.  The newest edition on Tips for Maintaining Rubber Covered Rollers has more than advertised by the title.&nbs...

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Posted in: Design, Maintenance, Nips, Rollers
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22

Machine Builder Competence II

Posted by David Roisum on December 22, 2011
How to tell at a glance if your machine builder doesn’t know what they are doing: Lack of calibrated load cell readouts Lack of calibrated nip readouts Tension not steady
Posted in: Design, Nips, People, Tension/Drive Control, War Stories in Web Handling
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08

Winding pressure-sensitive materials

Posted by David Roisum on December 8, 2011
Winding pressure-sensitive materials
Q: I plan to wind large rolls of delicate material on a two-drum winder. I am concerned that pressures might emboss the tender coating. A: There are two pressures to be concerned with. The first is the external nip pressure between the wound roll and the drum. (Note a similar problem is the interna...

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Posted in: Materials, Nips, Problem Solving, Tension/Drive Control, Winding
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06

Winding Recipes

Posted by David Roisum on December 6, 2011
Winding Recipes
Q: I am looking for a "cookbook" for winding different type of materials. Specifically, a book that would explain what tension and taper (%) as well as nip should be used for each material in order to make perfect rolls. A: Unfortunately, there are no "recipes'"to make a perfect roll. To begin with...

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Posted in: Materials, Nips, Problem Solving, Safety, Tension/Drive Control, Winding, Wrinkling & Flatness
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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.