Moulding video discs

Details Moulding video discs Moulding video discs

1979-11-06

1980-11-04

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Surface deformation means only

425810, 425411, B29C 300, B29C 1700, B29D 1700

Patent

active

042317304

ABSTRACT:
A means for moulding thermoplastics video discs having one or two shaped resilient compensators to maintain the stamper plates in parallelism with the plastics foil during moulding. The compensators may be of a rubber and may contain a thermally conductive material.

REFERENCES:
patent: 2578209 (1951-12-01), Schwarz
patent: 2841083 (1958-07-01), Kirkpatrick et al.
patent: 2998622 (1961-09-01), Renoux
patent: 3819315 (1974-06-01), Borchard et al.
patent: 3830459 (1974-08-01), Strausfeld
patent: 3918875 (1975-11-01), Phillipson et al.
patent: 3945790 (1976-03-01), Puech
patent: 4185955 (1980-01-01), Holmes et al.

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