Method of reducing tension in webs of thermoplastic material
AssigneePagendarm Beschichtungstechnik GmbH
InventorsAlbert Hebels, Ralph Pagendarm
Life of this patent
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Abstract
A running web of thermoplastic material is uniformly relaxed across its width by monitoring the tension in its marginal sections and by adjusting the corresponding heaters adjacent the path of the marginal sections. The median section of the web is relaxed in response to generation of a signal which denotes the tension profile across the entire web and is obtained as a result of the processing of signals which denote the monitored tension in marginal sections of the web. Those sections of the web wherein the tension is higher are heated less intensively than the sections wherein the tension is lower.
Claims5
A method of thermally influencing tension in a running elongated web of thermoplastic material, comprising the steps of ascertaining the tension in a plurality of longitudinally extending sections of the elongated web which are disposed side by side as considered transversely of the web;
- and admitting heat to said longitudinally extending sections at a rate which is a function of the ascertained tension in the respective sections to thereby influence the tension in said sections, including supplying lesser quantities of heat to sections wherein the tension is higher and supplying greater quantities of heat to sections wherein the tension is lower.
Dependencies are inferred from the claim text.