Dr. David Roisum
Nip Impressions Paid 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
Thinking Thin? Paid 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.
Now We Can Cry – Intermittent (but regular as rain) Web Problems Paid 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,
Web Wise: Are you my customer? Paid 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
WEB WISE: What’s behind the real problems caused by air entrainment? Paid 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,
WEB WISE | What is the best roller wrap angle? Paid Members Public
This mundane question is, in some ways, more important than its more popular cousin, “What is the best roller-to-roller span?” 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
Design For Manufacturability: Machines Paid 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.
How to Approach a Wrinkle Paid Members Public
Wrinkles are quite likely the single largest cause of waste, delay and customer complaint in the collective industries. It got to be the largest in large part because it may be one of the hardest to remedy due to having multiple causes, and the difficulty for some subtypes such as baggy webs.