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Web Handling & Converting

Blogmaster: Dr. David Roisum

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Problem Solving

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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15

Wishful Thinking – Tension and Wrinkling

Posted by David Roisum on February 15, 2012
Wishful Thinking – Tension and Wrinkling
Getting stuck in problem solving is epidemic.  We get stuck on wishful thinking, optimism, hope and a host of other ‘positive’ attitudes.  Now, don’t get me wrong, I am not suggesting that these traits are necessarily bad, only that they can be when you get stuck in a rut...

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Posted in: Problem Solving, Tension/Drive Control, Wrinkling & Flatness
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07

Web Smoothness, COF, Tension and Telescoping

Posted by David Roisum on February 7, 2012
We recently encountered customer complaint regarding roll telescoping.  Presently, we have the same tension settings for two different types of foil that have different roughness values. Would you recommend a higher or lower rewind tension for smoother foil surface (less roughness value)? Whil...

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Posted in: Design, Materials, Problem Solving, Tension/Drive Control, Winding
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26

The Optimum Component Repair Time

Posted by David Roisum on January 26, 2012
The Optimum Component Repair Time
From the previous post we noted that nearly everyone has an idea of the costs of maintenance.  (We used cover grinding as an example, but the application is much wider than this).  The more frequently you grind the greater the maintenance costs.  If that is the only cost management ha...

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Posted in: Maintenance, Problem Solving, War Stories in Web Handling
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24

The Sawtooth and Excessive MTBS (poor maintenance practice)

Posted by David Roisum on January 24, 2012
The Sawtooth and Excessive MTBS (poor maintenance practice)
The Third Law of Thermodynamics and Murphy’s Law both require that things break down.  When do you get around to fixing them?  Maintenance culture tends to fall into one of two patterns.  The first is to fix it when it has to be fixed, i.e., the machine will no longer run saleab...

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Posted in: Maintenance, Problem Solving, Rollers, War Stories in Web Handling, Web Manufacturing
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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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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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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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17

Roll Hardness Profiles - Alternatives

Posted by David Roisum on November 17, 2011
Recall from the previous post, that effective culling is economically better for both customer and supplier than are customer complaints.  Start culling now rather than wait for some magic bullet cure so the benefits are achieved sooner rather than later.  Culling can also help with possib...

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Posted in: Measurement, Problem Solving, 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.