Converting Quarterly title
The Official
Technical Magazine
of AIMCAL
small AIMCAL logo
  Search

Web Handling & Converting

Blogmaster: Dr. David Roisum

25 Latest Articles Current Articles | Archives | Search

Entries for January 2012

31

Tension Guidelines

Posted by David Roisum on January 31, 2012
Tension Guidelines
Respected sir, I came upon a TAPPI standard that tension should be 10-25% of yield strength. 1. Is there any scientific rule to setting these value or are they heuristic? 2. What rule shall we follow in printed electronics industry? I am especially interested in the allowed variation fro...

[Read the rest of this article...]

Posted in: Design, Maintenance, Materials, Rollers, Tension/Drive Control
Actions: E-mail | Permalink | Comments (0) RSS comment feed | del.icio.us
27

PFFC Magazine - Phoenix Rising

Posted by David Roisum on January 27, 2012
PFFC Magazine - Phoenix Rising
It’s said that bad news travels fast. Conversely, I’m hoping the great news that PFFC is back will travel at lightning speed. Many learned of the decision In late August 2011 that Penton Media had decided  to cease publication of Paper, Film & Foil Converter (PFFC). The great n...

[Read the rest of this article...]

Posted in: Current Affairs, New & Noteworthy, People
Actions: E-mail | Permalink | Comments (0) RSS comment feed | del.icio.us
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...

[Read the rest of this article...]

Posted in: Maintenance, Problem Solving, War Stories in Web Handling
Actions: E-mail | Permalink | Comments (0) RSS comment feed | del.icio.us
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...

[Read the rest of this article...]

Posted in: Maintenance, Problem Solving, Rollers, War Stories in Web Handling, Web Manufacturing
Actions: E-mail | Permalink | Comments (2) RSS comment feed | del.icio.us
20

Rubber Cover and Chemical Incompatibilities

Posted by David Roisum on January 20, 2012
Metso has published another roller related article, this time a small laundry list of some rubber cover incompatibilities with certain chemicals found in the paper industry.  You can find a more in-depth discussion of the topic in the Rubber Roller Group Handbook and perhaps even more from your...

[Read the rest of this article...]

Posted in: Design, Materials, Measurement, Rollers
Actions: E-mail | Permalink | Comments (1) RSS comment feed | del.icio.us
18

Core Shaft Deflection

Posted by David Roisum on January 18, 2012
Is there a “rule of thumb” or guideline for allowable winding shaft deflection for in-line slitting?  I am talking to a converter that wants to in-line slit a heavy extrusion coated product on his turret winder, possibly up to 66” wound roll diameter.  Is it as simple as ...

[Read the rest of this article...]

Posted in: Design, Nips, Rollers, Winding, Wrinkling & Flatness
Actions: E-mail | Permalink | Comments (0) RSS comment feed | del.icio.us
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)...

[Read the rest of this article...]

Posted in: Design, Rollers, Safety, Tension/Drive Control
Actions: E-mail | Permalink | Comments (0) RSS comment feed | del.icio.us
13

FYI on Upcoming Events You Can't Afford to Miss

Posted by David Roisum on January 13, 2012
Call for Papers AIMCAL's Web Handling Conferences June 13-15 in Prague Czech Republic and October 24-26 in Myrtle Beach Florida. AIMCAL's 2012 Converting School agenda were you will find Web Handling, Winding, Industrial Problem Solving and many other must-know topics.
Posted in: Current Affairs, New & Noteworthy
Actions: E-mail | Permalink | Comments (0) RSS comment feed | del.icio.us
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.&...

[Read the rest of this article...]

Posted in: Design, Nips, Slitting, Spreading, Tension/Drive Control, Winding, Wrinkling & Flatness
Actions: E-mail | Permalink | Comments (2) RSS comment feed | del.icio.us
10

Crown Correction

Posted by David Roisum on January 10, 2012
My venerable Mechanics of Rollers book has a couple of omissions that I have long regretted.  They are both, fortunately, nicely published in Metso’s Up and Running web page.  The newest edition on Tips for Maintaining Rubber Covered Rollers has more than advertised by the title.&nbs...

[Read the rest of this article...]

Posted in: Design, Maintenance, Nips, Rollers
Actions: E-mail | Permalink | Comments (0) RSS comment feed | del.icio.us
Page 1 of 2First   Previous   [1]  2  Next   Last   

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.