Patent ID: 8181484
Filing Date: 2012-05-22
Classification: C03B

Abstract:
1. A production process of using an upper mold part having a pressing surface and a lower mold part having a setting surface arranged to be opposed to the pressing surface to produce a thin-plate form glass molded body, comprising: pressing a melted glass between the pressing surface and the setting surface for a period of 0.6 seconds or less, wherein the temperature (° C.) of the pressing surface is adjusted during the pressing to a temperature of Tg−220 or higher and Tg−50 or lower and the temperature (° C.) of the setting surface is adjusted during the pressing to a temperature of Tg−20 or higher and Tg+50 or lower wherein Tg represents the glass transition point (° C.) of the glass; the pressing of the melted glass is performed to set the temperature (° C.) of the thin-plate form glass molded body to a temperature of Tg−20 or higher, and lower than Tg in a period of 0.8 second or less after the end of the pressing; the viscosity log(η in poise) of the melted glass is set to 1 or more and 4 or less at the time of the start of the pressing; and when pressing the melted glass, a temperature of the setting surface is controlled by a heating device.