Apparatus for the edges of thermoplastic webs

Details Apparatus for the edges of thermoplastic webs Apparatus for the edges of thermoplastic webs

1976-03-23

1977-05-03

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

Press forming means, press reshaping means, or vulcanizing...

Means corrugating a preform

425391, 425363, 425394, 425383, 425367, 425385, B29C 1500, B29C 1700

Patent

active

040211797

ABSTRACT:
The edge knurling of a thermoplastic web must often be carried out at elevated pressure in order to ensure a sufficient knurling depth even after the web has been wound and unwound different times. The prior heating of the web margins permits knurling to be carried out at lower pressures but may adversely influence the crystallinity of a film and also requires an increased amount of energy.
The heating of the knurling wheel or tool itself reduces such disadvantages.

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patent: 3313002 (1967-04-01), Wyeth
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patent: 3471897 (1969-10-01), Baxter
patent: 3671361 (1972-06-01), Morrison
patent: 3820933 (1974-06-01), Aspin

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