Rca Inc.

Barry N Stevens

Frederick Russell Nyman

Lincoln Ekstrom

James A Calamari, Jr

Lester R Aldridge

Video discs are dried by first spraying the surface with liquid fluorocarbon to remove water and heating the disc so as to prevent water condensation during evaporation of the fluorocarbon, preferably in a fluorocarbon vapor.

Drying process for video discs

In an apparatus for cleaning recorded discs wherein the discs are immersed into and removed from a cleaning liquid in a container, a flow of the liquid is provided substantially parallel to and slightly below the level of the liquid in the container across the area of the surface of the liquid through which the discs pass as they are removed from the liquid. The flow is provided by a plurality of nozzles located in the container slightly below the level of the liquid through which relatively clean liquid from the container is pumped. This flow is at a rate such as to remove from the area of the surface through which the discs are to pass contaminants which may float to the surface of the liquid.

Apparatus and method for cleaning recorded discs

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.

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Indianapolis, IN, United States of America

Barry N Stevens