Video disc molding process

Details Video disc molding process Video disc molding process

1979-12-28

1982-03-09

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Forming sound grooves in records

Die pressing disk type records

264322, 425810, B29D 1700

Patent

active

043188770

ABSTRACT:
An improved apparatus and method of molding a high density information disc which includes maintaining the molding composition at an elevated temperature between the extrusion step and the record pressing step, such that the resultant disc is of improved quality. A heated shot cup is provided to maintain the extruded molding composition at the elevated temperature and in which the same is molded into a preform from which the disc is pressed.

REFERENCES:
patent: 3526690 (1970-09-01), Bachman
patent: 4213927 (1980-07-01), Alberti

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