[China Glass Net] Due to its poor thermal conductivity, 1 temporary stress. The glass is heated or cooled below the strain point temperature. Each part will form a temperature gradient, resulting in inevitable thermal stress. This thermal stress, as the temperature difference exists, has a larger temperature difference, and the stress is also larger, and disappears as the temperature difference disappears. This thermal stress is called a temporary stress.
But before the temperature is out of balance, it should be noted that the stress can be dispelled by itself. When the stress value exceeds the ultimate strength of the glass, the glass abnormality will rupture on its own, so the heating or cooling rate of the glass in the brittle temperature range should not be too fast.
Thermal stress caused by temperature difference, 2 longer stress. The glass is cooled from the beginning of the strain point temperature. After the glass is cooled to room temperature and the temperature of the inner and outer layers is out of adjustment, it cannot be completely dissipated. The glass still bears a certain stress in the same way. This stress is called water long-term stress. The magnitude of the longer-term stress depends on the glass machinery such as the cooling rate of the finished product above the strain point temperature, the viscosity of the glass, the thermal shortening factor, and the thickness of the product.
The advantages and disadvantages of annealing the thick glass of the edge are closely related to the thickness curve of the glass, and the improved thickness curve is improved by annealing. In particular, the thickness of the edge of the glass plate is required. The individual requires a thickness curve to ensure that the thickness at 25 mm of the edge is about 1 mm thinner than the flat thickness. I have not been able to do this in the past. The first thing is that the edge is too thin to reduce the load, so as to reduce the tempering stress. The thickness of the glass is increased due to the increase in thickness, resulting in a delay in the penetration of heat in the glass, if it is produced under high load. Thick glass can lead to an increase in the tempering stress in the vitreous, which makes it difficult for the subsequent cutting and the customer to change, which also causes troubles in annealing, increased bursting, and reduced yield. Therefore, it is necessary to reduce the load to meet the appropriate tempering stress. Adding the gas spray gun in the A zone and adding the chilled water after the washing machine. As mentioned above, the advantages and disadvantages of the edge stress directly affect the longitudinal cut, which requires the glass to be in the annealing kiln. Zones A and B try to advance the temperature of the edge, because a gap spray gun has been added at the entrance of the annealing kiln. It is a good choice to add a pair of gas spray guns in Zone A to advance the tensile stress at the edge of the glass.
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