METHOD OF MANUFACTURING THERMALLY TEMPERED GLASS

摘要

PROBLEM TO BE SOLVED: To provide a method of manufacturing thermally tempered glass by which the deformation or the like during transportation in a heating furnace is surely suppressed even when super highly thermal tempering is carried out and relatively heavy and thick glass is thermally tempered. SOLUTION: In the method of manufacturing the thermally tempered glass by heating glass G to be tempered to equal to or above the strain point and below the softening point in the heating furnace 1 and discharging the glass from the furnace and cooling the surface of the glass G to thermally temper based on the difference of a temperature between the surface and the core part of the glass in the strain point, the difference of a temperature between the surface and the core part in the strain point is secured to a fixed value by locally heating the core part of the glass G with electromagnetic wave of millimeter wave band and as a result, the glass G having the discharge temperature of the glass surface lower than that in discharging the glass G heated only with the heating furnace 1 is discharged from the heating furnace 1. COPYRIGHT: (C)2005,JPO&NCIPI