Manufacture of contoured records

Details Manufacture of contoured records Manufacture of contoured records

1976-03-26

1977-06-28

Kucia, Richard R.

Plastic and nonmetallic article shaping or treating: processes

Forming sound grooves in records

Die pressing disk type records

264153, 264154, 264284, 264314, B29D 1700

Patent

active

040326101

ABSTRACT:
A method of making disc records, particularly video discs from thermoplastic sheet material. In a press a thin flexible matrix is disposed between the sheet, which is backed by a resilient cushion, and a flexible diaphragm which constitutes a wall of a hydraulic pressure chamber.

REFERENCES:
patent: 1582704 (1926-04-01), Sylvester
patent: 2616125 (1952-11-01), Colombo
patent: 2998622 (1961-09-01), Renoux
patent: 3072519 (1963-01-01), Salzman
patent: 3157723 (1964-11-01), Hochberg
patent: 3614811 (1971-10-01), Johnson

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