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Analysis: The future development trend of the world glass industry
Today's world glass manufacturers in the development of tempered glass new technology, are to energy, materials, environmental protection, information, biology and other five areas of development and demand. Therefore, domestic and foreign glass manufacturers and processors must recognize the situation, one is the material: the production of glass original pieces to large, thin, thick, white four categories of development; Second, research and development of new technologies: From the surface and internal modification of glass products, applications, functions and other aspects, so that the glass has more strength, heat insulation, fire resistance, safety, sunlight control, sound insulation, self-cleaning (environmental protection) and other excellent functions, so as to join the 21st century human materials, energy, information, environmental protection, biological development of the five major projects, and provide glass materials used in the above projects. To this end, the development of new technologies in the glass industry is mainly manifested in two major areas (the development direction of new technologies in the flat glass industry and the development of new varieties of deep-processed glass), which are roughly as follows:
1.low-e tempered glass industry new technology In flat glass original manufacturing technology, at present, there is no new and better method to replace float molding technology abroad, but float technology will continue to improve and improve. It is reported that foreign countries in the raw material development of nepheline syenite instead of potassium feldspar to achieve energy saving, alkali saving and other good comprehensive benefits; In addition, the new measure of replacing coal powder with petroleum coke (carbon powder) as an additive to enhance the white permeability of glass and reduce microbubbles has received extremely good results. The United States has taken the lead in the development of oxygen combustion in the melting department. In the forming department, ultra-thin and online pyrolysis method has been developed and developed to produce Low-E, Sun-E(hard film) layer energy-saving and environmental protection glass, and float production of embossing glass in the second line of float kiln. Therefore, the research and development of four major new technologies and new processes, such as raw materials, melting, forming and annealing, should attract the attention and reference of peers.
1.1 Ultra-thin technology
The only way to produce float ultra-thin glass is to apply longitudinal - horizontal tension to the glass strip (US patents 4,349,642, 4,354,866; British patents 1010913, 1313743; Russian patent 775997, 367685, 485,079).
Colorless transparent high-quality ultra-thin glass is one of the important materials for the production of ITO film glass, and the product is currently popular in the international and domestic markets, and the product is in short supply. Glass manufacturers in many countries have already seen this business opportunity, and have changed their original individual production lines into ultra-thin glass production lines. The British Pilkington company changed a smaller float line into an online coating ultra-thin glass production line, which can produce 0.4 to 1.1 mm thin glass, the flatness of the plate surface is excellent, and the microwave ripple is only 30 to 50 nanometers.
1.2 Float glass annealing kiln roller table technology
At the hot end of the annealing kiln, the two approaches used to solve the roller impression are obviously different. One is the development of a very hard ceramic surface coating for metal rollers, which is easy to clean and restore to a smooth polished surface, and can be used in annealing kiln in-line cleaning equipment. The other is to develop a roller coating material that can prevent the formation of surface attachments, but also to solve the problem of "slag particles" and premature degradation of the coating material in the ceramic fiber coating material (which is currently unavoidable).
1.3 Online coating technology
Developed countries have successfully developed on-line metal compound pyrolysis coating technology, chemical vapor deposition coating technology, electrofloat coating technology, low radiation coating technology in the float process. Britain, France, Belgium and other countries can produce glass mirrors online.
1.4 Various oxygen combustion technologies for glass melting kilns
Five forms of oxygen-rich combustion, oxygen injection, oxygen-rich air supply, pure oxygen combustion and all pure oxygen combustion have become standard technologies and are constantly improving and developing.
1.5 Laminated glass first kiln second line development
In order to meet the market demand, save energy, control the total production, and prevent the backlog, the international glass manufacturers have designed and built a second-line production mode of a kiln (two varieties). The United States Gadian company learned that the international market builders still have considerable demand for embossed glass, the company in South Carolina float glass factory in the United States immediately technical transformation to become a second line of a kiln, 600 tons/day float line new 100 tons/day embossed glass production line, can produce float glass and embossed glass. Another company in the United States to occupy the Arab countries embossed glass market, in Saudi Arabia to build 550 tons/day float line, but also designed to build 100 tons/day embossed glass line. Japan Asahi Glass Company in the domestic construction of a 500 tons/day float glass production line, but also designed and built 100 tons/day embossed glass production line. At present, European glass manufacturers are also building float and calendering one-kiln two-line production lines.
1.6 Energy-saving technology
The production capacity and economic benefit of float process can be greatly improved by strict control of heat exchange, standardization of equipment and widening of glass ribbon. The traditional process requires heating in the head and middle area of the tin tank and intense cooling in the tail area. The new view requires that the heat exchange regulation in the tin tank should not only reduce the heating power, but also reduce the cooling intensity, so that the heat balance can be maintained. To this end, new methods are used to more accurately regulate the heat of the tin tank, such as special heaters placed on the peephole of the tin tank and adjustable selective temperature process coolers.