A Model for Looper-Like Structure in Web-Fed Printing Press

In a multi-unit web-fed system, tension control is important because it affects the strip quality. Moreover, the most difficult challenge in the controller design and control performance comes from the interaction between looper angle and strip tension. In this paper, the structure of looper in a web span with idlers is presented and the model of looper-like structure is proposed to effectively eliminate the ’tension transfer’ phenomenon among web spans in a multi-unit web-fed system.

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