Unwinding and Winding Thin Films at High Speeds
Presented by John A. Pasqualle III, New Era Converting Machinery, Inc.
Unwinding and winding, on a continuous basis, requires automated splice and transfer systems. A number of web cut-off technologies are available for us to choose from, among them being shear, traversing knife, rotating knife and rupture knife. Unwind splices can be lap or butt type. Winder transfers can be with or without fold-over. The selection of the technology that is to be employed is dependent upon the needs of the overall process and the physical properties of the web materials that are to be processed.
For this discussion, we have chosen to limit our focus to the core elements found in what is commonly referred to as the “bump and cut” splice and transfer techniques, which techniques are most commonly employed for thin film applications. When preparing to design and manufacture the splicing and transfer components of a high-speed, automated turret unwind or winder, several key components and their control must be addressed. This presentation concentrates on the bump roll and cut-off knife assemblies, as well as the control equipment used to ensure both their speed and repeatability.
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