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Glass Breaking During Tempering and its Solutions (3)
Source :    Release time:2013-11-15

3. Glass breaks in the furnace during the heating 

Heating furnace is a key link in the whole glass tempering machine. Glass breaks in the heating furnace, which usually occurs to the large-breadth thick glass. This mainly because that it's hard to evenly heat the large-breadth thick glass which suddenly meets high temperature from constant room temperature; sometimes the glass quality is also a reason. For example, the glass contains the stones as impurities and nickel sulfide particles. 

1) Enable the equipment function of heating delay. That is, the equipment preheats glass for a certain time before starting turning the heat power on. Usually any glass in thickness over 10mm needs the program of heating delay. The duration of delay depends on the thickness of glass, which shall be prolonged when the initial set duration fails to meet the requirement. 
2) Properly reduce the whole glass tempering furnace temperature. 

3) Check the quality of glass sheet, and choose the high-quality sheet. 

4. Corner losing of plate glass 

When heating plate glass, if the upper temperature is much higher than the lower temperature (the temperature difference between upper and lower surfaces usually shall be controlled within 5 centigrade), the glass will dome up and form a spherical surface, and then its four corners will support the whole glass. Moreover, the glass oscillates in the heating furnace, and the corner will collide with the roller when glass moves from one roller to another roller and the corner will be lost.

1) Properly increase the bottom temperature or reduce the upper temperature when the glass sheet is heated in the glass tempering furnace;  
2) If the temperature setting is proper, the reason may be the over high heating balance, in which case the power of heating balance can be adjusted. 

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