By David R. Roisum, Ph.D., principal, Finishing Technologies, Inc. Introduction 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. More often, it is not quite that easy. Another remedy is to change the path of the web using an … [Read more...] about A basic guide to web guiding
Web Handling
Benefits and challenges of designing and using accumulators in various web-handling operations
By Neal Michal, principal, Converting Expert LLC Accumulators benefit many web processes. Zero-speed splicers offer a 99.99% success rate. Accumulators smooth out processes that are required to index. They provide time for a winder operator to start a new roll. Benefits come with challenges. If the accumulator is poorly designed, maintained or controlled, various … [Read more...] about Benefits and challenges of designing and using accumulators in various web-handling operations
The role of new system-level simulation in solving difficult web-handling design problems
By Orang Vahid, Ph.D., dir.-Application Engineering, Maplesoft; and Steve Lange, managing member, ProcessDev LLC Due to increased demand for consistent quality and faster turnaround times when ordering new web-handling systems, machine designers are turning to simulation to stay ahead of the competition. Simulation models that include dynamical aspects have the advantage … [Read more...] about The role of new system-level simulation in solving difficult web-handling design problems
Improve a zero-speed splice unwind process by learning to reduce tension disturbances
By Neal Michal, principal, Converting Expert LLC This last installment will present tension dynamics obtained from a representative zero-speed splice event. Recall that the splice takes place while the downstream process runs at full speed. The tension dynamics are repeatable and will be described in phases. A procedure to set up an unwind will be explained. Seven additional … [Read more...] about Improve a zero-speed splice unwind process by learning to reduce tension disturbances
How to achieve tight toleranceswith the wrap shear-slitting process
By John Marold, applications engineer & slitting specialist, Parkinson Technologies, Inc. Introduction In the world of slitter/rewinders, achieving a tight slit-width tolerance is essential to the operating process for many applications. To ensure such a tight tolerance is achievable, proper alignment and minimal movement leading up to the slitting of the final … [Read more...] about How to achieve tight toleranceswith the wrap shear-slitting process