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Web Handling & Converting

Blogmaster: Dr. David Roisum

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Safety

16

E-stop Times

Posted by David Roisum on January 16, 2012
Are there standards for E-stop times? As far as I know, there are no published 'standards' on E-stop times for our web handling industries.  What we do have is quite minimal 1) the general practice in large paper winders of E-stop rates of no less than 250 FPM/sec on each driven component 2)...

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Posted in: Design, Rollers, Safety, Tension/Drive Control
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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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01

Mandrel/Spool/Roller Journal Safety

Posted by David Roisum on October 1, 2011
Thankfully, journal failures are rare.  However, when it does occur it is often catastrophic; things come loose; things that have mass and speed; things that clearly pose a safety hazard when they come loose. Most journal failures are due to fatigue at stress risers at the journal fillets; eve...

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Posted in: Design, History, Maintenance, Rollers, Safety, Winding
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11

Winder Safety per Metso

Posted by David Roisum on September 11, 2011
According to the US Bureau of Labor Statistics, many more people are killed in the workplace every year in the US than were killed on 9/11 (and nearly 10X that number die on the highways according to the US National Highway Traffic Safety Administration).  In our web industries, nips and winder...

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Posted in: Nips, Safety, Winding
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18

Roll and Roller Safety – No Touch, No Approach

Posted by David Roisum on February 18, 2011
Roll and Roller Safety – No Touch, No Approach
According to this month’s Discover magazine, our sense of touch is incredibly, well, sensitive.  Our fingers can detect grooves as small as 50 nanometers or about 2 millionths of an inch.  They also can detect temperature differences as small as 0.01 degrees F.  This motivates s...

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Posted in: Rollers, Safety, Winding
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16

Roll Flagging Safety

Posted by David Roisum on February 16, 2011
Putting flags into a wound roll by hand can be less accurate (placement position) and less safe than marking or flagging the roll automatically. The reason is that a web entering a wound roll acts like an ingoing nip, especially for tough (high strength and high stretch) materials. It is best to k...

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Posted in: Safety, Winding
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14

Roll Ripper Safety

Posted by David Roisum on February 14, 2011
Roll Ripper Safety
One of the most common accidents in web plants is utility knife cuts. Most companies will instruct workers to always secure whatever you are cutting and move the knife away from all body parts. Many companies require gloves, some even fully length gauntlets for the left hand. The most safety-cons...

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Posted in: Safety, Winding
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27

Where to Locate a Control Panel

Posted by David Roisum on January 27, 2011
A control panel should be the last thing to be located when assembling a machine. It must be located where the operator has the best lines of sight to the most important or troublesome areas of the process. For safety reasons it is vital that the operator be able to have a clear line of sight from...

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Posted in: Design, Safety, Tension/Drive Control
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26

Things That DO Belong on a Control Panel

Posted by David Roisum on January 26, 2011
There is vital process information that must be found in a nearby instruction manual if not on the operating panel screen itself. These include safety instructions, setup instructions, cleanup instructions, recipes for all common grades, PLC faults, and PLC permissives that are not being met. Howe...

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Posted in: Design, Safety, Tension/Drive Control
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30

Lemon Gojo

Posted by David Roisum on October 30, 2010
Lemon Gojo
I learn so much from the people I work with.  Sometimes it is from my clients, other times from students and in this case from operators.  One of my students in a recent class remarked that they used Lemon Gojo for cleaning up sticky messes on rollers and other equipment.  The idea ca...

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Posted in: (Other) Converting, Maintenance, Problem Solving, Rollers, Safety
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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.