METHOD FOR MANUFACTURING GLASS PLATE WITH WHICH WARPING DURING CHEMICAL STRENGTHENING IS REDUCED AND GLASS PLATE

摘要

The present invention relates to a method for producing a float glass sheet, containing a step of melting a glass source material, a step of forming the glass melted in the previous step into a glass ribbon while allowing it to float on a molten metal, and a step of annealing the glass ribbon, in which the float glass sheet is a soda lime silicate glass, and in the forming step, a top surface of the glass ribbon that is opposite to a bottom surface thereof to be in contact with the molten metal is subjected to a dealkalization treatment in the float bath for 1 to 30 seconds and a surface temperature of the glass ribbon during the dealkalization treatment is 600° C. or higher.

主权项

1. A method for producing a glass sheet, which is a method for producing a float glass sheet, comprising a step of melting a glass source material, a step of forming the glass melted in the previous step into a glass ribbon while allowing it to float on a molten metal, and a step of annealing the glass ribbon, wherein:
the float glass sheet contains (mol %) from 63 to 73% of SiO2, from 0.1 to 5.2% of Al2O3, from 10 to 16% of Na2O, from 0 to 1.5% of K2O, from 5 to 13% of MgO, and from 4 to 10% of CaO, and in the forming step, a top surface of the glass ribbon that is opposite to a bottom surface thereof to be in contact with the molten metal is subjected to a dealkalization treatment in the float bath for 1 to 30 seconds and a surface temperature of the glass ribbon during the dealkalization treatment is 600° C. or higher.