Converting Blogs
Dave’s Favorite Defects: Splices
By Dr. David R. Roisum Whether you do lap or butt splices and whether your splices are completely automatic or completely manual, few are trouble-free. In this short clip, we will outline a few of the splicing methods as well as concerns and resources. Web201.68p:https://www.youtube.com/watch?v=Yj0SIx0WVtg
Web Handling Handbook
By Clarence Klassen After many years, the authoritative “The Web Handling Handbook” has been published and is available as a 750-page bound book or as a PDF. I first heard about this book in 2016 from the principal author, Dr. David R. Rosium. He indicated a wiki-style of writing would be used to create a […]
Q: Can one coating method be used for all required coating steps in a process? Part 1 of 4
By Dr. Edward D. Cohen A: There are two important elements that that need to be considered in the selection of the appropriate coating method for a web-processed product at each of the specific coating-application steps in the overall web-coating process. These elements are the coating-method operating range and the specific product coating-application requirements. The coating […]
Q: What are some of the challenges of new vacuum-coated product scale-up? Part 1 of 3
By Dr. Charles A. Bishop A: I regularly get asked advice about scaling up a process where there is a belief that all the research and development (R&D) work has been done. Samples of the desired coating have been produced, the decision has been made to scale-up, and often this means scale-up directly to the […]
Q: What is the importance of polymer structure and orientation in films? Part 1 of 4
By Dr. Eldridge M. Mount A: In an earlier column, I spoke of the foremost substrate secret, i.e.: what are the polymers of the substrate? After this secret is discerned, one of the most profound secrets of the substrate is “What is the molecular orientation of the polymers in the substrate as a whole or of […]
Dave’s Favorite Defects: Slitting
By Dr. David R. Roisum There are many methods for cutting webs, yet few applications are trouble-free. In this short video clip, we will define slitting concerns such as quality defects and where to turn if you need more information. Web201.68m: https://www.youtube.com/watch?v=M7PdST3XkCc
Web Handling Handbook – Now Available
By Dr. David R. Roisum “The Web Handling Handbook is for anyone who has to make tough decisions at 03:00, or has to implement a new process, or is charged with improving throughput and reducing waste. This is now the go-to resource. It manages to bring clarity for those who want a ‘Just give me […]
Drive requirements for turret positioning: Part 2
By Clarence Klassen Several drive parameters affect the accuracy of positioning a turret. A previous blog entry discussed the need for better than 1-degree positioning accuracy for many turrets winders. The most precise and expensive turret drive would be a servo (positioning) drive with an encoder. This would result in a fast index time with very good […]
Dave’s Favorite Defects: Rough roll edges
By Dr. David R. Roisum Even if your customer is not currently complaining, poor roll edges may look like poor workmanship to your customer. No matter whether you have nearly laser-cut-looking roll edges or they are as ragged as a hedge, everyone can benefit from better-looking wound rolls. Roll edges are very much like the […]
Dave’s Favorite Defects: Path-control problems
By Dr. David R. Roisum We will define path control problems as whenever the web’s CD position is not stable with time. We will also see that in many cases the web CD position is ALSO not stable with down web MD position as well. True, your operator and your quality control department will not necessarily […]