Process for improving dimensional stability of polymeric films u

Details Process for improving dimensional stability of polymeric films u Process for improving dimensional stability of polymeric films u

1988-02-16

1989-07-11

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Treating shaped or solid article

By a temperature change

264 13, 264106, 264342R, B29C 7102

Patent

active

048470333

ABSTRACT:
The present invention provides a process for improving the dimensional stability of a thermoplastic polymeric film such that it can be used as a flexible support in optical disk assemblies in which maintenance of flatness, smoothness and track configuration of the record layer thereon is essential. This process comprises the steps of: (a) heat treating the film for a time and at a temperature sufficient to achieve a low free volume state; (b) subjecting the film to a substantially uniform omnidirectional tension; and (c) heat treating the film while under such tension for a time and at a temperature sufficient to effect substantial stress relaxation.

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"Mechanical Performance of Optical Disk Media Fabricated with Stretched Plastic Sheets" by J. Varner, R. Auble, J. Carroll and S. Miller. SPIE vol. 420-Optical Storage Media, 1983.
"Method for Preparing Dimensionally Stable Polymeric Film", Research Disclosure, Item 19809, Oct. 1980, Published by Industrial Opportunities Ltd., Homewell, Havant Hampshire, P09 1EF, United Kingdom.

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