Process for producing a thin-plate form glass molded body
AssigneeKabushiki Kaisha Ohara
InventorMoriji Nozaki
Life of this patent
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Abstract
In a process for a thin-plate form glass molded body, an upper mold part having a pressing surface is used together with a lower mold part having a setting surface arranged to be opposed to the pressing surface. A melted glass lump is pressed between the pressing surface and setting surface. The pressing 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, wherein Tg represents the glass transition point (° C.) of the glass, in a period of 0.8 second or less after the end of the pressing.
Claims18
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.
A method for producing a glass molded body, comprising:
- pressing a melted glass by an upper mold part and a lower mold part for a period of 2.0 seconds or less to form a glass molded body, wherein when pressing the melted glass, a temperature of one of the upper and lower mold parts is controlled by a heating device;
- and
- terminating the pressing the melted glass, and
- wherein the temperature (° C.) of the upper mold part is adjusted during the pressing to a temperature of Tg−220 or higher and Tg−50 or lower and the temperature (° C.) of the lower mold part is adjusted during the pressing to temperature of Tg−20 or higher and Tg+50 or lower;
- and
- the pressing of the melted glass is performed to set a temperature (° C.) of the glass melded body to a temperature of Tg−20 or higher and lower than Tg in a period of 0.8 seconds or less after the end of the pressing.
A method for press forming a glass molded body consisting of:
- providing a melted glass on a setting surface;
- pressing the melted glass on the setting surface by a pressing surface for a period of 0.4 seconds or less to form a glass molded body, wherein a 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 a 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 temperature of the pressing surface is controlled by a heat exchange unit, the temperature of the setting surface is controlled by a heating device, and the viscosity log(η in poise) of the melted glass is 1 or more and 4 or less at the time of the start of the pressing;
- and
- terminating the pressing the melted glass by pulling the pressing surface away from the melted glass,
- wherein the pressing of the melted glass is performed to set the temperature (° C.) of the 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 method of claim l6, wherein the temperature (° C.) of the pressing surface is adjusted to a temperature of Tg−220 or higher and Tg−50 or lower, the temperature (° C.) of the setting surface is adjusted to a temperature of Tg−20 or higher and Tg+30 or lower, and the viscosity log(η in poise) of the melted glass is set to 2 or more and 2.5 or less at the time of the start of the pressing.
Dependencies are inferred from the claim text.