Process for producing a thin-plate form glass molded body, and process for producing a disc form magnetic recording medium
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.
Claims10
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 press a melted glass between the pressing surface and the setting surface, thereby producing a thin-plate form glass molded body,
- wherein 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 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.
Dependencies are inferred from the claim text.