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Web Handling & Converting

Blogmaster: Dr. David Roisum

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Entries for December 2011

24

Best Wishes

Posted by David Roisum on December 24, 2011
I am working on a number of personal and professional projects, so I will take my leave until the first of the year.  In the mean time, shoot me a line on what topics you might want to hear about in 2012.  My best wishes to you and yours during these holidays.
Posted in: Current Affairs
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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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20

Machine Builder Competence I

Posted by David Roisum on December 20, 2011
Three simple (but surprisingly effective) ways to know whether your machine builder is competent: Fewest idler rollers Fewest idler roller diameters Fewest idler roller surface types
Posted in: Design, People, Rollers, War Stories in Web Handling
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15

The Last Roller

Posted by David Roisum on December 15, 2011
The last roller is special.  It is right before the winding roll.  Because the winding roll has such crappy geometry, such as having diametral profile variations two orders of magnitude greater than a roller, it is just waiting to misbehave.  So, how to we give our web the best chance...

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Posted in: Design, Rollers, War Stories in Web Handling, Winding, Wrinkling & Flatness
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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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11

Industrial Problem Solving

Posted by David Roisum on December 11, 2011
AIMCAL’s Converting School has added my Industrial Problem Solving course to their 2012 curriculum; April 24 – 25, 2012  in Chicago.  I have taught this subject for more than a decade and it is the subject of two of my nine books.  Many students think this is the best and ...

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Posted in: Current Affairs, New & Noteworthy
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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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03

2012 Converting School - Preliminary Schedule

Posted by David Roisum on December 3, 2011
People have already been asking about next year’s schedule.  Put it into your calendar now and begin now to work on your boss using your best persuasive skills. March 27 – 28, 2012 :  David Roisum, Chicago, Web Handling March 29 – 30, 2012 : David Roisum, Chicago, Windi...

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Posted in: Current Affairs
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01

Paper Length and Moisture

Posted by David Roisum on December 1, 2011
I would like to know why the paper length of wound roll decreased about 200 to 250 meters after increasing the moisture contents about 1% on newsprint paper 45GSM? The coefficient of hygroscopic expansion for paper is about 0.1% for every 1% change in moisture for typical levels of moisture of 4-8%...

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Posted in: Measurement, Winding
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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.