When thick glass is heated, if the temperature of the upper part is higher than the lower part (the temperature difference between the upper and lower surfaces should be controlled within 5 ℃), the glass will bulge to form a spherical surface, and four corners will appear to support the whole glass. In this case, because the glass swings back and forth in the heating furnace, when the glass moves from one roller table to another, the corners will collide with the roller table, and the corners will fall off. Solution: 1. Properly increase the bottom furnace temperature or lower the upper furnace temperature; 2. If there is no problem with the furnace temperature setting, the heating balance may be too large, and the power of the heating balance can be adjusted appropriately.
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