[China Glass Net] In daily life, we often contact tempered glass products, such as coffee tables, tempered glass doors, tempered bathroom doors, etc. When cleaning such objects, we will find that some tempered glass is not clean, what is it? The reason is that the glass is not cleaned? The tempered glass is not clean because the quality of the glass does not meet the standard, and defects such as glass ribs and pitting occur after tempering. The following is a small list of points:
Whether the quality of tempered glass can meet the standard, in addition to the reason of the glass raw materials, whether the setting of the process parameters is reasonable is the determining factor. Only by thoroughly understanding their roles and relationships can we produce high-quality tempered glass. All the parameters are designed around "uniform heating, rapid cooling", but they are not isolated, they are an organic whole, and must be considered in order to get a perfect process. Temperature-related glass defects and methods of correction:
1, the wave
If the set temperature is too high and the heating time is too long, the glass will appear wave. This is because the heating of the glass has exceeded the critical point, and the glass has begun to soften. If such a defect occurs, the heating time can be shortened. .
2, pitting
If the heating time is too long, pitting will occur on the lower surface of the glass. The pitting can be divided into two types, one is dense and orange peel, which is caused by too long heating time (especially 12 mm or more). Thick glass, some units set the heating time to make it not broken, can be adjusted according to the situation. The other is an individual star-shaped pitting, which is caused by the unclean surface of the upper stage and the ceramic roll, or the fact that the glass fragments of the winder roll are not cleaned.
3, white fog
White fog is in the middle of the lower surface of the glass, and a white trace appears. It usually appears in the first few furnaces of the initial production. This is due to the excessive surface temperature of the ceramic roller. When the glass enters the furnace for the first few tens of seconds. The lower surface of the glass is directly subjected to heat conduction and curled at four corners, and the contact surface between the glass and the ceramic roll becomes small, and the frictional force with the ceramic roll increases, and the surface temperature of the ceramic roll disappears as the surface temperature decreases. We can set the lower temperature to be lower in the initial production, and lower the lower power. In addition, it must be continuously produced, and the furnace can not be operated empty. If it is not produced temporarily, the heating switch can be turned off to prevent it. White fog appeared.
4, bending
When we produce tempered glass, if it is bent, it is usually adjusted by adjusting the wind pressure or adjusting the blowing distance. It is very effective and quick. However, some operators do not understand that the difference in temperature between the upper and lower will also cause the glass to bend. Assuming the blowing distance of the wind segment is equal to the wind pressure, if the four corners of the glass are bent upwards, the lower temperature is too low. If the corners of the glass are bent downwards, the temperature in the lower part is too high. If it is necessary to adjust the temperature to make the glass flat, it can be solved without one or two furnaces, and it takes several furnaces.
5, spherical
This is when the thin glass of 6 mm or less is made and the layout is relatively large. It is possible to increase the vertical temperature in the middle longitudinal direction by the function of temperature adjustment. Sometimes it is necessary to increase the temperature by about 30 degrees. (Incremented from the second row on both sides in the vertical direction). An operator should understand that the relationship between temperature and optical performance is: high temperature, long heating time, high yield, but poor optical performance; otherwise, low temperature, or short heating time, good optical performance, but low yield . This requires us to carefully summarize and find better results. The temperature is highly dependent on the particle size of the tempered glass; under the conditions of equal wind pressure, the temperature is high and the particles are small, and the temperature is low.
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