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Web Handling & Converting

Blogmaster: Dr. David Roisum

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Spreading

24

Wrap Angle Rock Around the Clock

Posted by David Roisum on April 24, 2012
Wrap Angle Rock Around the Clock
At uber, ultra, very, big, great risk of over-generalizing and over-simplifying, I would like to offer you some ideas on some application range for wrap angles.  The application ranges include idlers, tendency and driven rollers and include systems that are and are not wrinkle-prone.  Here...

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Posted in: Design, Rollers, Spreading, Wrinkling & Flatness
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05

Worst-Case:? - Moderate Misalignment

Posted by David Roisum on April 5, 2012
Many states have Good Samaritan laws that protect well-meaning first responders who try to help accident victims from liability and lawsuit.  However, there is no Good Samaritan exemption from the brutal laws of physics.  So, even moving in the correct direction could make things worse.&nb...

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Posted in: Problem Solving, Rollers, Spreading
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28

Wishful Thinking - Baggy Webs

Posted by David Roisum on February 28, 2012
A few students are disappointed in the baggy web part of my Wrinkling module of my Web101 course.  What they expected was some ‘web handling tricks’ such as a tension setting or spreader or something that would make bagginess better.  However, by time they get to my class they&...

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Posted in: Materials, Problem Solving, Spreading, Upcoming Events, Wrinkling & Flatness
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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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03

Reasonable, But Wrong

Posted by David Roisum on January 3, 2012
Plants have been a lifelong passion; I have grown (and killed) more than 1,000 species.  I would read, study and try best-practices for many areas of horticulture.  For example, the practice of putting drainage gravel at the bottom of containers/pots was taught by nearly every source for m...

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Posted in: Problem Solving, Spreading, War Stories in Web Handling, Winding
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13

The First Roller

Posted by David Roisum on December 13, 2011
Your supplier has provided you with a pretty crappy wound roll.  Captured inside the roll for weeks, the web is just waiting to misbehave.  Let it loose and it will misbehave at the first opportunity; the first roller.  However, if you tame the web at that first roller; it might make ...

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Posted in: Design, Spreading, War Stories in Web Handling, Winding, Wrinkling & Flatness
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22

Baggy Web Conversation

Posted by David Roisum on November 22, 2011
The following is historical fiction.  One where certain essential details are accurate, but the ‘conversation’ has been rewritten to protect the guilty. Dear Dr. Roisum, I was your student in a Converting School back in 20__. We now have a difficult web-handling problem caused ...

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Posted in: Materials, Measurement, Problem Solving, Rollers, Spreading, War Stories in Web Handling, Winding, Wrinkling & Flatness
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06

How to Tape Rollers?

Posted by David Roisum on October 6, 2011
You can use any tape suitable for the application. Of course, simple masking tape is cheap and easy. However, masking tape is not very durable and is a $#&! to remove after it sits on a roller for more than a few hours. There are products that are more durable and easier to get off such as 3M...

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Posted in: Rollers, Spreading
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04

Why Tape Rollers?

Posted by David Roisum on October 4, 2011
Taping a roller is often used as a substitute for grooving or rubber roller covering. Tape can be a fast, inexpensive and flexible method to deal with certain challenges. It can also be a literal and figurative mess; causing waste, delay and confusion. The devil is, as they say, always in the det...

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Posted in: Rollers, Spreading
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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.