Hollow laminated glass wash is not clean because the glass does not meet the quality standards, after the emergence of steel bars, pitting and other defects.
Hollow laminated glass quality can meet the standards, in addition to glass raw materials outside the reasons, the process parameters set is reasonable or not is the deciding factor. Only by fully understanding their role and mutual relationship can we produce high-quality toughened glass. All parameters are designed around a "uniform heating, rapid cooling", but they are not isolated, but an organic whole that must be considered in order to get a perfect process. Temperature-related glass defects and corrective measures:
1, wave tendons
If you set the temperature is too high, the heating time is too long, then the glass will appear waves, this is because the glass has been heated over the critical point, the glass has begun to soften, if the shortcomings of this shortcoming will be able to solve the heating time .
Heating for too long can cause pitting on the underside of the glass. Pitting can be divided into two types, one of which is dense, orange-peel-shaped, which is caused by prolonged heating (especially 12 mm or more Thick glass, and some units in order to make it not broken and the heating time is set to be very long, can make adjustments according to the situation. The other is the individual star-shaped pitting, which is due to the table and ceramic roller surface is not clean, or the wind roller roller glass fragments are not cleaned.
3, white fog
White fog is in the middle of the glass surface, there is a white mark, it generally appears in the initial production of the first few furnace, which is due to the surface of the ceramic roller temperature is too high, when the glass into the furnace within the first few ten seconds , The lower surface of the glass is directly subjected to heat conduction and curled in four corners, the contact area between the glass and the ceramic roller becomes smaller, the friction with the ceramic roller is increased, and disappears as the temperature of the ceramic roller surface decreases. We can set the temperature of the lower part to a lower value at the time of initial production, set the lower part of the power to a lower value, and in the meantime, continue to produce it without letting the oven run dry. If it is not possible to turn off the heating switch temporarily, White fog appears.
When we produce tempered glass, if the bending is generally by adjusting the wind pressure, or adjust the hair distance to solve, very effective and quick. However, some operators do not understand the upper and lower temperature differences can also cause the glass bending, assuming that the distance of the wind section of the wind, the size of the wind pressure is equal, if the glass corners up, it shows the lower temperature is too low, on the contrary if The corners of the glass bend downward, indicating that the lower part of the temperature is too high, if you need to adjust the temperature to make the glass flat, then not one or two furnace can be solved, after several furnaces.
5, the sphere
This is done in the 6 mm thin glass and the layout of the relatively large time appeared, through the temperature adjustment function of the vertical temperature up and down the middle of each can be raised, and sometimes need to be raised about 30 degrees. (From the second row on both sides of the vertical increase toward the middle). A good operator should understand that the relationship between temperature and optical performance is: high temperature heating time, the yield will be high, but poor optical properties; the other hand, low temperature, or heating time is short, good optical performance, but the yield will be low. This requires us to seriously sum up, looking for the best results. Temperatures and tempered glass has a great relationship between the particle size; Under the same pressure conditions, the temperature of small particles, low temperature particles.