Method of producing plate-shaped body

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

B - Operations, Transporting

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B29D 17/00 (2006.01) B29C 43/02 (2006.01) B29C 43/14 (2006.01) B29C 43/52 (2006.01) G11B 3/70 (2006.01) G11B 7/26 (2006.01) B29C 35/16 (2006.01)

Patent

CA 1142719

ABSTRACT OF THE DISCLOSURE 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 in 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 thereof. The thermoplastic resin is allowed to be solidified without any substantial and local residual stress to ensure minimal circumferential warp, thickness fluctuation and deflection of the signal track.

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