Method for producing glass plate
AssigneeNippon Electronics Glass Co., Ltd.
InventorsHidetaka Oda, Noritomo Nishiura, Koki Ueda, Tomonori Kano
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Abstract
In an annealing zone (3) of a glass sheet producing method, a curved portion (5) is formed by curving a glass ribbon (G) in a width direction, and a concavo-convex direction in a front and back direction of the curved portion (5) is reversed at least between an upper side and a lower side of a part of a region in the width direction of the glass ribbon (G). Therefore, a bending resistance in an upper and lower direction of the glass ribbon (G) and a bending resistance in the width direction of the glass ribbon (G) are increased.
Claims20
A glass sheet producing method, comprising the steps of:
- forming a glass ribbon into a sheet-like shape;
- annealing the glass ribbon so that internal distortion of the glass ribbon is removed;
- cooling the glass ribbon to about room temperature;
- and
- cutting the glass ribbon into predetermined dimensions,
- at least the forming and the annealing being performed along with downward movement of the glass ribbon,
- wherein the annealing comprises:
- forming a curved portion by curving the glass ribbon in a width direction;
- and
- reversing a concavo-convex direction in a front and back direction of the curved portion at least between an upper side and a lower side of a part of a region in the width direction of the glass ribbon, to thereby increase a bending resistance in an upper and lower direction of the glass ribbon and a bending resistance in the width direction of the glass ribbon.
Dependencies are inferred from the claim text.