Float Glass High Light Transmittance, Smooth Surface
1. What is ultra-thin flat glass
The so-called ultra-thin flat glass is relatively flat glass thickness, the general thickness of 3ram below the thin glass, and the thickness of 1.5mm below people called ultra-thin glass.
At present, there are several different types of forming process in the world, such as vertical drawing method, flat pull method, overflow method, platinum furnace drawing method and float method, which can draw 0.1 ~ 30mrn different thickness flat glass respectively. According to the different glass thickness, it is divided into the following seven types of glass: / A, thin glass 1.5 ~ 3mm; / B, ultra-thin glass 0.1 ~ 1.5rnm; / C, very thin glass <0.1mm; / D, ordinary flat Glass 4 ~ 8mm; / E, thick glass 8 ~ 12mm; / F, thick glass 12 ~ 19mm: / G, especially thick glass 19 ~ 30mm.
Ultra-thin flat glass production methods, can be used float and flat pull method, overflow method, pull the law of the system from the system.
2. What is the Float Glass
Float Glass is produced by the float process of ultra-thin glass, has been able to draw to 0.3mm thickness of the commercial glass. It is a new high-tech, high value-added quality glass, with high light transmittance, surface smoothness, high hardness, good chemical stability, wide application and so on.
3. Application of Float Glass
Float Glass applications have been involved in the six major industries, science and technology:
(1) electronic information industry flat panel display device substrate glass, such as TN, STN, TFT, LCD liquid crystal display, electroluminescent display (ELD) and electroluminescent display (FED) glass substrate.
(2) Watches masked glass, instruments and automotive instrumentation glass, industrial similar holographic plate glass, camera cover glass.
(3) solar panels for solar panels, solar cells, protective panels, glass.
(4) copiers, fax machines and various types of encoder glass.
(5) Microscope, medical glass.
(6) industrial materials with materials such as scales glass.
4. Brief Introduction to Several Production Processes of Ultra - thin Flat Glass
4.1 Platinum furnace down method
Germany EGLASS platinum technology company in 1983, the first successful development of 0.7t / D platinum furnace pull down technology and equipment, can be drawn thickness 1.1mm, width of 250mm ultra-thin transparent glass plate. Today, the company has been able to design and provide Nissan 6t platinum furnace, can be drawn thickness 0.6mm, plate width 1200mm ultra-thin glass.
4.2 flat pull method thin drawing process
It is one of the methods used by the Belgian company of Gravie, which is used in the United States of America to study the characteristics of other molding processes on the basis of the United States. Kind of flat drawing process, it has a non-stop operation to replace the pull roller characteristics, so that flat production line for a month or longer, but also has to change the thickness of easy, short time interval and so on. But the glass quality is not high is the main problem.
4.3 material drawing method
At the end of the melting furnace is equipped with authoritarian feed channel, so that the molten glass from the supply channel into the U-shaped overflow tank, when the overflow tank filled with glass from the overflow tank on both sides of the natural spill, The bottom of the overflow tank is merged into a glass ribbon, which continues to fall under the action of gravity, and is then pulled into a slim glass by mechanical pull-down rollers. The process can generally draw 0.5 ~ 1mm ultra-thin glass. The disadvantage is that the production is small, the board width is narrow, due to the size of the overflow tank limit, the board width is usually less than half of the float glass plate width. However, the biggest advantage of this process is that it is suitable for a variety of glass components, and the overflow of the ultra-thin glass and float glass has a similar good surface quality and does not require polishing, so is still the production of TFT glass main process.
4.4 Vertical drawing process
In the raw material selection, melting stability, process system stability and with a special drawing on the premise of the machine, you can use vertical pull on the law less than 2mm thin glass plate. Germany Horn (HORN) companies use vertical drawing process drawing 0.5 ~ 2mm thin glass and ultra-thin glass to be successful. China's Qinhuangdao electronic glass factory in the country took the lead in the introduction of the company's three machine without a vertical drawing process line, including the furnace, lead forming units, the thickness of the glass plate 0.5 ~ 3mm, plate width of 1.35 ~ 1.65m , Conventional products for the 1.1 ~ 3mm thin glass. Dalian glass factory is the use of slotted vertical machine to produce 1.5 ~ 2mm thin glass. As a result of drawing thin products often line, bubbles and other defects, so the quality of low yield.
4.5 float process
(1), Float Process Ingredients - Melting - Forming - Annealing - Cutting - Packaging - Shipping.
(2), Float Glass production is by increasing the number of puller, deep tin bath, to increase the linear motor and other equipment and precise control of the process parameters with ordinary float process to achieve the same process.