Video disc processing

Details Video disc processing Video disc processing

1981-10-29

1983-09-20

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Forming sound grooves in records

Die pressing disk type records

264233, 425810, B29D 1700

Patent

active

044055412

ABSTRACT:
High density information discs, such as video discs, which have been treated with an ammonium salt become resistant to and stable under conditions of high relative humidity, even after repeated exposure to such conditions for extended periods of time. The treatment with the ammonium salt is accomplished by use of a bath of an aqueous solution of the ammonium salt, with the preferred ammonium salt being ammonium chloride.

REFERENCES:
patent: 4228050 (1980-10-01), Martin et al.
patent: 4275100 (1981-06-01), Datta

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