[Medium glass] Generally, when the thickness of the tempered glass is more than 8mm, it is often found that one or several longitudinal cracks appear at the front end of the glass, so-called "burst". This is due to the large temperature loss from the exit to the arc of the front end of the glass. Generally speaking: as long as the length of the blasting hole does not exceed 30mm, it has no significant influence on the tempering strength. How to reduce or eliminate the phenomenon of “burst�
1. The edging of the glass should be good, especially the lower part of the front and rear ends (ie close to the roller surface) should not exceed 1/3 of the thickness of the glass, which is an effective way to reduce or eliminate the blasting.
2. Appropriately increase the furnace temperature, especially the temperature at the outlet end.
3. Preheating of the wind screen: a. Before producing thick glass, first produce thin glass of 8mm or less; b, use glass to test the furnace, that is, heat to normal temperature, and the time to swing in the wind grid More than 3 times the normal blowing time, but do not blow.
4. A heat lamp can be used to illuminate the gate end to compensate for the heat loss of the glass.
5. Appropriately increase heating time and empty furnace time.
6. Appropriately increase the speed of the furnace and the arcing speed.
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