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Web Handling & Converting

Blogmaster: Dr. David Roisum

Entries for 'David Roisum'

31
Web Handling Brussels and Delhi
Don’t miss out.  Public web handling instruction comes only a couple of times a year to Europe.  See you for my Web and Winding short-courses hosted by AIMCAL's Converting School: 16-19 November in Brussels Belgium as well as 2-3 December in De...

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Posted in: Current Affairs
30
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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28
Wound Roll Length and Diameter Calculations
For most of my professional life, I have provided equations to others. Typical examples would include many aspects of sizing of rollers such as shown in my Mechanics of Rollers book and a chapter on figuring out wound roll diameter or length given various inputs in my Winding: Machines, Mechanics an...

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Posted in: Winding
26
Foil is very very tricky. It does not like to be touched by anything that is not perfect, or perfectly tolerant. One resulting practical problem is that you might not be able to align rollers close enough. (I have seen cases on copper foil where a lightly wrapped roller HAD to be misaligned to fo...

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22
Web Handling Europe
Don’t miss out.  Public web handling instruction comes only a couple of times a year to Europe.  See you for my Web and Winding short-courses hosted by AIMCAL's Converting School: 16-19 November in Brussels Belgium as well as 2-3 December in Delhi India (co-sponsored by the India Con...

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21
It is usually not hardware or software (more accurately firmware). It is usually ‘wetware’. Someone does not know what they are doing, most likely the drive application engineer. So, here is my Drive 101 ‘Wetware’ test. S Curves used for speed reference Appropriate acceleration rate (control no...

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20
Speed reference held to 1-2 parts per 1,000 Tension held to Tension held to 10% or so during speed changes and a bit more for other upsets No tension related problems during accel and decel Dancer does not bottom out Ammeters smooth synchronously and smoothly Web edge moves very little during...

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19
How do I know if my drives are messed-up?
An operator who step, step, steps the speed up or down either does not know how to run a machine or is responding to an ugly drive ‘system’. By system we mean all aspects of the machine that affects tension and obviously includes motor, drive controller, drive control program, sensors, ...

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17
If you’ve followed the news on the Nobel Prize awards you are aware that this year’s award in physics went to Andre Geim and Konstantin Novoselov "for groundbreaking experiments regarding the two-dimensional material graphene" and you’ve probably already heard about its seemingly m...

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14
Two-Drum Rider Roller - 3
How do you control the rider roller (or core shaft control) load? Very carefully. Seriously. The rider roller nip load control is easily and by far the most complicated nip control on any converting machine element, anywhere. This complication does not, necessarily, require computers and such. ...

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Posted in: Nips, 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.