Method of reducing tension in webs of thermoplastic material

Details Method of reducing tension in webs of thermoplastic material Method of reducing tension in webs of thermoplastic material

1988-06-24

1990-02-27

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 406, 2642105, 264342RE, 425143, B29C 6102

Patent

active

049044257

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.

REFERENCES:
patent: 3347960 (1967-10-01), Fenley
patent: 3610897 (1971-10-01), Gerhard et al.
patent: 3646188 (1972-02-01), Campbell
patent: 3782873 (1974-01-01), Lynnknowles
patent: 4329315 (1982-05-01), Brower et al.

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