Dr. David Roisum

A Basic Guide to Web Guiding Members Public

Your web’s path may not be where you want it. One remedy is to find and correct the original source of the path upset. This might be as simple as moving the unwinding roll over sideways a bit.

Alex Nevels
Web Guiding

Nip Impressions Members Public

Presented by David R. Roisum, Finishing Technologies, Inc. A nonuniform nip is nearly synonymous with a nonuniform product. Uneven nips are also a common cause of web handling waste such as wrinkles, web breaks and other troubles. There are many causes for nonuniform nips. However, all are readily detectable by

Kevin Lifsey
Conference Proceedings

Thinking Thin? Members Public

Presented by David R. Roisum, Finishing Technologies, Inc. Markets drive us to ever thinner webs to reduce material costs and waste going to the landfill. The challenges for running a lighter basis weight or thinner caliper are at least as difficult for web handling as they are for web manufacturing.

Kevin Lifsey
Conference Proceedings

Now We Can Cry – Intermittent (but regular as rain) Web Problems Members Public

Presented by Dr. David Roisum, Finishing Technologies, Inc. Certain problems occur intermittently and regularly not only in the web industry at large, but also on a specific web machine.  This list is huge and includes things like baggy webs, wrinkling and winding defects.  I call these intermittent but regular problems,

Kevin Lifsey
Conference Proceedings

Web Wise: Are you my customer? Members Public

Many of us recall the P.D. Eastman children’s book, Are You My Mother? Like most children’s books, the lesson and answer are simple. In this case, the presumption is that you only have one Mom. Life is much more complicated in industry, specifically related to customers. You

Alex Nevels
Converting Quarterly

WEB WISE: What’s behind the real problems caused by air entrainment? Members Public

Air entrainment is real, and it can cause real problems, but only in certain circumstances. When and where and what are the salient questions. Let us begin with the “what” of the mechanics. As seen in Figure 1, air “sticks” to both the web and the roll(er). During run,

Alex Nevels
Converting Quarterly

WEB WISE | What is the best roller wrap angle? Members Public

This mundane question is, in some ways, more important than its more popular cousin, “What is the best roller-to-roller span?”[1] Yes, both affect the layout and cost of a machine. However, rules for wrap angles are more numerous, and much more consequential, if you get them wrong. Let us

Alex Nevels
Converting Quarterly

Design For Manufacturability: Machines Members Public

New machines and upgrades are exciting. However, they are also expensive and risky. Choices made early in the project can affect the plant for a generation or more.

Kevin Lifsey
Web Handling