High density information disc processing

Details High density information disc processing High density information disc processing

1981-01-14

1982-04-27

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Forming sound grooves in records

Die pressing disk type records

15302, 264130, 264233, 425810, B29D 1700

Patent

active

043270484

ABSTRACT:
High density information discs that have been compression molded from a conductive carbon-containing polyvinylchloride molding composition are cleaned with a water based solution to remove water soluble salts from the surface of the disc, followed by a high temperature aqueous wash wherein the temperature is from about 110.degree. to about 130.degree. F. These discs have improved environmental stability.

REFERENCES:
patent: 3842194 (1974-10-01), Clemens

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