The temperature of the heating furnace should be set within a reasonable range and cannot be easily adjusted. Minor temperature adjustments can have a significant impact on the heating efficiency of glass. In actual production, if it is necessary to adjust the glass outlet temperature, it is generally achieved by changing the heating time to obtain a more accurate glass temperature.
1. The stress on the glass should be completely eliminated. The residual stress in the glass cannot be completely eliminated, and it is easy to cause glass fracture when tensile stress forms in the center of the glass during the early stage of quenching.
2. The glass temperature should not cause serious deformation of the glass, so the furnace temperature should not be set too high, and it is appropriate to be 60~100 ° C higher than the discharge temperature of the glass.
3. Due to the selective absorption of infrared rays by glass, the infrared wavelength in the heating furnace should be within the absorption range of the glass. According to the absorption spectrum of glass, the maximum radiation wavelength in the furnace is best at 3 Around 0 µ m, the corresponding furnace temperature is set to around 700 ° C.
The discharge temperature of forced convection furnace glass is most suitable between 600~630 ° C, so most radiation heating furnaces are set at temperatures between 680~720 ° C. Considering the relationship between stress relief time and temperature, as well as the formation of temperature gradient during quenching, the heating furnace temperature of thin glass is generally slightly higher than that of thick glass. In the Shencheng tempering furnace, with the widespread adoption of air forced convection heating technology, the furnace temperature setting of the Shencheng convection heating furnace is slightly 20 ° C lower than the general radiation heating furnace, which is more conducive to heating offline coated glass, with an E value of 0.02.
