Floatation Technology of Borosilicate Glass
Borosilicate glass forming process technology is melting, clarification, homogenization of the molten glass, high temperature in the tin bath floating in the molten tin liquid surface, the use of molten glass surface tension, glass and tin liquid between the surface Tension, glass liquid gravity to complete the glass liquid leveling, thinning, polishing, cooling, solid and other processes, making it better than polished glass of high quality flat glass. The factors that determine the effect of borosilicate glass formation are glass viscosity, surface tension and self-gravity. In these three factors, the glass viscosity mainly from the role of glass stereotypes, glass surface tension mainly from the role of glass polishing, glass gravity is mainly from the role of glass flattening, the three of the glass liquid leveling, polishing And thinning have a certain role, combined with each other in order to carry out borosilicate glass production.
Boron glass under the surface of the amount of tin and tin infiltration tin and tin penetration of borosilicate glass on the quality and deep processing of glass have a greater impact. At present, the amount of tin under the surface of borosilicate is usually expressed by CPM, which is the characteristic line count of tin per minute of borosilicate glass, which is called the number of tin per minute. Generally speaking, the lower the curve is, On behalf of the whole board infiltration less and even. Domestic and foreign and joint venture glass CPM value there is a relatively large gap, the amount of glass exposed to the serious processing of glass, the specific value shown in Table 33.
Boron glass under the surface of the amount of tin and tin infiltration tin and tin penetration of borosilicate glass on the quality and deep processing of glass have a greater impact. At present, the amount of tin under the surface of borosilicate is usually expressed by CPM, which is the characteristic line count of tin per minute of borosilicate glass, which is called the number of tin per minute. Generally speaking, the lower the curve is, On behalf of the whole board infiltration less and even. Domestic and foreign and joint venture glass CPM value there is a relatively large gap, the amount of glass exposed to the serious processing of glass, the specific value shown in Table 33.
Table 33 Comparison of CPM values for glass in domestic and foreign and joint ventures
| French samples | Belgian samples | Domestic enterprises | Domestic 500 t / d grade borosilicate wire |
| 21 | 21 | 18 ~ 25 | 46 ~ 51 |
According to the information, tin vapor pressure increases rapidly with the tin liquid temperature, as shown in Table 6, 730 ℃ when the tin vapor pressure is 1.35 × 10Pa, 1 440 ℃ when the tin vapor pressure is 133.32 Pa, you can see the temperature - 4 increased by 1 times, the vapor pressure increased by 7.04 × 10 times. Therefore, compared to high borosilicate glass and soda lime silica glass, if the tin tank front temperature increased about 300 ℃, the tin vapor pressure increased by 142 times. In this way, when the borosilicate produces high borosilicate glass, the glass liquid is like a tin bath, and the temperature of the high borosilicate glass is increased by several hundred degrees, and the activity of the tin ion is greatly enhanced, and the tin ions penetrate into the glass The ability of the surface is greatly enhanced, the possibility of increasing the amount of tin is greatly increased, and the effect of tin on the change of the surface properties of the glass is greater, which is one of the problems to be solved by the borosilicate glass process.
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