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Blogmaster: Dr. David Roisum

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Entries for 'David Roisum'

08

The Optimum Number of Suppliers

Posted by David Roisum on September 8, 2011
for any critical part or material is three. Of course, the baggy web survival strategy in the previous post requires that you have other suppliers for your web. In an ideal world, there would be three suppliers. Suppliers A and B are currently and regularly used while C is qualified and waiting i...

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08

The Optimum Number of Suppliers

Posted by David Roisum on September 8, 2011
for any critical part or material is three. Of course, the baggy web survival strategy in the previous post requires that you have other suppliers for your web. In an ideal world, there would be three suppliers. Suppliers A and B are currently and regularly used while C is qualified and waiting i...

[Read the rest of this article...]

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06

Baggy Web Survival Strategy

Posted by David Roisum on September 6, 2011
The first time you get baggy material, send the roll back to the supplier. What will they do? They will pay the claim. What will they not do? Fix the problem. The second time you get baggy material, try to find some measure of bagginess and a threshold of pain. Candidates include roll hardness...

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Posted in: (Other) Converting, Problem Solving, War Stories in Web Handling, Web Manufacturing, Wrinkling & Flatness
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04

American Printer – Up, Down and then Up Again

Posted by David Roisum on September 4, 2011
American Printer – Up, Down and then Up Again
Following fast on the heels of the demise of Converting Magazine (Webhandlingblog 4/20/2010) and Paper Film Foil magazine (Webhandlingblog 8/27/2011), we now have the Penton owned American Printer shutting down after 128 years of publication.  Both the paper and website versions of the mag...

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Posted in: Current Affairs
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01

Baggy Edges, Baggy Center, Baggy Lanes and Tight Lanes

Posted by David Roisum on September 1, 2011
Which is worse? I propose that baggy edges are worse, since they can not be spread. Or maybe baggy centers are worse because the tight ends have a mind of their own (think two independent ribbons) and can move toward each other, thus cause a gathering wrinkling in the middle. Or maybe baggy lanes...

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30

Baggy Webs - The Primary Cause

Posted by David Roisum on August 30, 2011
Baggy Webs - The Primary Cause
The primary cause of bagginess is caliper/gage/thickness variation that builds up as ridges on the wound roll that then differentially yield (stretch) the web into bagginess. Since this is a TTP (Time Temperature Pressure) problem, winding looser would help. So too would converting quickly (though...

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Posted in: Web Manufacturing, Winding, Wrinkling & Flatness
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27

PFFC - RIP

Posted by David Roisum on August 27, 2011
PFFC - RIP
Wait a day before hitting the return button is good advice when you are upset.  I waited two days in this case, just in case. The owner of Paper, Film and Foil Converter magazine, Penton Media Inc., has decided to discontinue producing the print magazine and all its electronic media products. ...

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Posted in: (Other) Converting, Current Affairs, History, New & Noteworthy
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26

Dishing - Nonsymmetrical

Posted by David Roisum on August 26, 2011
Occasionally the dishing favors one side. That always means something is crooked. That could be a web caliper (gage) profile that is roughly carrot shaped. That could be frameways, slides or winding arms that are loose or misaligned.

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25

Dishing - Don't get pushed around

Posted by David Roisum on August 25, 2011
Roll growth (and other mechanisms) have been known to cause axial loads in excess of 10,000# on two-drum paper winders. This is enough to splay (bow) core chuck linear slides and the winder frame itself outward. Frames are too complicated to discuss here, but I can say that old-fashioned gibs are ...

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24

Dishing – The force be NOT with you

Posted by David Roisum on August 24, 2011
The force has two subcomponents. The first is roll growth. You can reduce the amount of roll growth by reducing any or all of the TNT’s. Forget taper or roll structure, it has no role here. Just wind looser. The second subcomponent is the gaps between the rolls. If the gap, primarily the resul...

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Blogmaster

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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.