Web Handling
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,
How Roller Shape Controls the Lateral Movement of Webs Paid Members Public
Presented by Jerry Brown, Essex Systems Last year, I talked about how shifting, or pivoting a roller produces lateral web motion. This time I will discuss how nonuniform rollers (tapered, concave and convex) produce lateral movement. Once again, we will see that it all comes down to the same thing
Practical Method to Design a Wrinkle Experiment Paid Members Public
Presented by Neal Michal, Converting Expert, LLC Wrinkles are the most common issue that web handlers face. The delivered quality of the web and the wound roll is contingent on the absence of wrinkles. It is common to find troughs and wrinkles in various places on a web process. Wrinkles
Things to Consider for a Successful Inline Slitting Process Paid Members Public
Presented by Joe Connelly, Parkinson Technologies Inc. On the surface, the thoughts of eliminating steps in a converting process to save time and gain efficiency are very appealing. Why wouldn't you want to get shippable products directly off the production line and avoid multiple steps? In many cases,
Web Material Properties: Easy Paths Through the Swamp (but beware of alligators!) Paid Members Public
Presented by Dilwyn Jones, Emral Ltd. The properties of webs are needed for diverse “web handling” activities such as machine specifications, design and upgrade, new and existing product development and manufacture, and troubleshooting breaks and defects – especially using formulae and models. Unfortunately, there is considerable variability hidden behind generic material
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?”[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
New Ideas on Web Troughs and Their Consequences Paid Members Public
Presented by Dilwyn Jones, Emral Ltd Troughs are gentle ripples in low and moderate thickness webs between rollers in many R2R machines. If they grow large enough, wrinkles, creases and folds can form on the next roller and cause product damage and waste. This paper outlines a new analysis of
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.
