Method of producing plate-shaped body

Details Method of producing plate-shaped body Method of producing plate-shaped body

1980-01-14

1981-11-24

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Forming sound grooves in records

Die pressing disk type records

425DIG810, B29D 1700

Patent

active

043024114

ABSTRACT:
A method of producing a plate-shaped body, particularly a video disc in which circumferential warp in the thicknesswise direction, thickness fluctuation and deflection of the signal track are minimized comprising
The steps of pressing by a mold a thermoplastic resin which has been heated to a temperature above the softening point thereof, and cooling the thermoplastic resin to solidify the same. During the cooling, the pressure of the mold is decreased to a low level when the thermoplastic resin has been cooled down to a temperature around the softening point. The thermoplastic resin is allowed to be solidified without any substantial and local residual stress to ensure minimal circumferential warp, thickness fluctuation and deflection signal track.

REFERENCES:
patent: 3060516 (1962-10-01), Van Houten
patent: 3747390 (1973-07-01), Knothe
patent: 4213927 (1980-07-01), Alberti

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