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US 2015/0225276 A1Published application
Glass-substrate manufacturing method
AssigneeAvanStrate Inc.
InventorHiroyuki KARIYA
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Abstract
A glass-substrate manufacturing method which includes a forming step and a cooling step. In the forming step, a molten glass is formed into a sheet glass by a down-draw process. In the cooling step, the sheet glass is cooled. The cooling step includes first, second and third coating steps as defined herein.
Claims20
A glass-substrate manufacturing method comprising
- a forming step of forming a molten glass into a sheet glass by a down-draw process, and
- a cooling step of cooling the sheet glass, wherein:
- the cooling step includes
- a first cooling step of cooling the sheet glass at a first average cooling rate until the temperature of a central region of the sheet glass drops to the annealing point,
- a second cooling step of cooling the sheet glass at a second average cooling rate until the temperature of the central region drops from said annealing point to a temperature 50° C. below the strain point, and
- a third cooling step of cooling the sheet glass at a third average cooling rate until the temperature of the central region drops from said temperature 50° C. below the strain point to a temperature 200° C. below the strain point;
- the first average cooling rate is 5.0° C./second or faster;
- the first average cooling rate is faster than the third average cooling rate;
- and
- the third average cooling rate is faster than the second average cooling rate.
7 more elements
Dependencies are inferred from the claim text.