[China Glass Net] The heating temperature of the glass. The effect of tempering temperature on product quality. Inappropriate temperature during tempering will have a series of effects on the quality of tempered glass, such as excessive glass fragments, glass bending, glass roller track marks, white glass under the glass surface, pitting of the glass surface, and glass cooling. Broken and so on. How is the glass quickly reach the required temperature? In the process of heating, we should pay attention to the following aspects: avoiding the overload phenomenon of the electric furnace. The electric furnace overload mentioned here does not refer to the area occupied by the glass in the electric furnace, but refers to the glass. Thickness, heating temperature and heating time, under normal operating conditions, in the heating area of ​​the central heating element of the electric furnace, there is always glass in the heat absorption, there is always glass in this area of ​​the electric furnace, if there is some inside the electric furnace The heat consumption in the area exceeds the heating effect, and the temperature in this area begins to decrease and falls until the temperature balances. Therefore, if the electric furnace is overloaded, the glass will be broken in the cooling section.
The heating temperature required for different thickness of glass is different. The thinner the glass is, the higher the heating temperature is. The thicker the glass is, the lower the heating temperature is. The operator should understand the mutual temperature between the furnace and the heating time. The relationship and the temperature of the electric furnace vary depending on the thickness of the glass. Therefore, in the tempered glass process, it is not clear which temperature setting is better. The choice of temperature is determined to a certain extent by the quality of the original glass and the adjustment of the operator. Process parameters. The glass tempering temperature of 5mm-15mm thickness is between 680-720. In actual production, the adjustment of heating temperature is mainly achieved by adjusting the heating time to control the heating temperature. The basic calculation method of heating time is The operator should master that the basic calculation method is about 40 seconds to 50 seconds per mm thickness of glass. If there are holes, holes, and slots in the glass, the heating time should be increased by 1.5-based on this. 2.5%. In addition, the larger the surface of the glass, the longer the heating time should be, and vice versa.
The bottom temperature measured by the heating system is not the roller temperature, but the average temperature after the heating element at the bottom of the tempering furnace compensates for the heat absorbed by the roller glass. due to this reason. The measured temperature is generally higher, higher than the measured upper temperature, so in general the upper heating is higher than the lower heating temperature setting. Second, add even heating. The success of glass tempering depends mainly on the lower temperature of the glass plate. To achieve tempering, the glass must first reach the tempering temperature. Therefore, it is necessary to achieve uniform heating of all parts of the glass surface. We must heat the glass in the electric furnace. To understanding. The heating of glass in electric furnace mainly includes three ways: conduction, radiation and convection.
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