Davis-Standard will make three presentations at the AIMCAL Web Coating and Web Handling Conferences, June 10-15 in Prague, Czech Republic. Duane Smith, Davis-Standard’s product manager of specialty winding, and Michael Schroeder, product manager of extrusion coating for ER-WE-PA GmbH, will present papers on winding topics that include guidelines for selecting the best winding processes, guidelines for rolls used in web handling, and center-surface winding.
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Guidelines for Selecting the Best Winding Process
by R. Duane Smith, Product Manager, Specialty Winding
There is a lot of science that goes into winding. The TNT (tension, nip, torque) winding principles are well established and have been proved and modeled at the Web Handling Research Center at Oklahoma State University in Stillwater, Oklahoma. However, determining which of these principles (or the proportional amount of each of these) to use for proper winding of different types of materials under a specific set of conditions is still considered an art. This paper is a guide for selecting the best type of winder in order to consistently produce high quality, defect-free rolls of web material. The winding principles, how they are used on different types of winders, and present product parameters for each type of winder are discussed.
Guidelines for Rolls Used in Web Handling
by R. Duane Smith, Product Manager, Specialty Winding
Today’s web producing and converting lines often must handle a wide variety of substrates resulting in wide tension ranges at ever increasing processing speeds. All web handling requires that a web be conveyed straight through a process without distortion or defects such as wrinkles. A converting process or film producing line both require the use of idler rolls, pull rolls, spreaders and edge guides in order to provide control of a web as it is conveyed. Without the correct size and application of these devices, the web might not track properly, could wrinkle, may be distorted, or could result in a web break. This paper provides general guidelines for selecting these items under various conditions. Understanding the selection process assists in successfully processing web materials to maximize the productivity and profitability of the web producing and converting line.
Centre – Surface Winding
by Michael Schroeder, Product Manager, Extrusion Coating
ER-WE-PA GmbH
Winding sensitive substrates and laminates requires a precise winding system that takes in account material behavior and surface characteristics. In the winding process, web shifting and wrinkles can easily occur when the incorrect tension parameters and configurations are chosen. Driven or non-driven contact winding in combination with a center-driven winder provides the best results for sensitive materials. Determining how to control the correct nip pressure during the winding process is one of the most critical questions in regard to material. Reel hardness, tension across the finished reel, and side accuracy of the reel are equally important. Starting the winding process directly on the core is one of the most critical points. This type of transfer for high-speed winding with and without core preparation is another big engineering challenge. This paper compares different winding systems, including winding systems with integrated multilane slitting as well as high speed winding with short cycle times for small batch sizes. It is written as a guideline for choosing the most correct or optimal system.
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