Chinese name: float glass English name: float glass Definition: It is prepared with sea sand, quartz sandstone powder, soda ash, dolomite and other raw materials, and is melted at high temperature in the furnace. The glass liquid continuously flows from the tank to the It floats on the surface of the molten metal and is spread into a flame-polished glass strip with uniform thickness. After cooling and hardening, it is separated from the molten metal and then annealed and cut to become a transparent colorless flat glass.
The forming process of float glass production line is completed in a tin bath filled with protective gas. Float glass is widely used and is divided into tinted glass, float silver mirror, float white glass/car windshield grade, float white glass/all kinds of deep processing grade, float white glass/scanner grade, float white glass/ Coating grade, float white glass/mirror grade. Among them, ultra-white float glass has a wide range of uses and broad market prospects. It is mainly used in the fields of high-end buildings, high-end glass processing and solar photovoltaic curtain walls, as well as high-end glass furniture, decorative glass, imitation crystal products, lighting glass, precision electronics industries, Special buildings, etc. .
Contents Development status of my country's float glass Product advantages Differences between production technology and ordinary glass Industry prospects Glass production process Energy-saving methods Float glass production process Mildew prevention
Edit this paragraph my country's float glass Glass development status In the late 1950s, the British Pilkington Glass Company announced to the world that it had successfully developed the float forming process for flat glass. This was a revolution in the original grooved top forming process. For a time, waves of float fever converged into a "float frenzy" that swept the world. Many countries in the world spent huge sums of money to acquire Pilkington's patents, but Pilkington initiated a technological blockade against China. The technological blockade of the West made Luo Bo realize that the development and production of float glass in China must follow the path of self-reliance and independent innovation. In May 1971, the former Ministry of Building Materials Industry decided to conduct float process industrial trials in Luobo. Glass experts from all over the country gathered in Luobo, and more than a thousand employees of Luobo participated in the war. The production of float glass is a brand-new enterprise that has never been done before in China. Since there is no information for reference, experimental production encountered waves of difficulties from the beginning. There is no design room, so experts from the Building Materials Department and the vast number of scientific and technical personnel from Luobo worked on the design in the boiler room and started construction after drawing sketches. Without large-scale lathe equipment, Luobo's fitters used the method of tinkering pots to process the 25-meter small tin trough on site. An important problem encountered in the production process at that time was that high-temperature glass water easily condenses when passing through the tin bath, resulting in uneven glass thickness. Sometimes glass water splashed in the tin bath, and the workers were injured everywhere. After long-term thinking, the technicians of CLB designed electric heating equipment on the upper part of the tin bath, which solved the problem of glass water easily condensing through the tin bath. Then, they developed their own glass edge-drawing machine, carefully designed the speed, angle, and pressing depth, and modified the shape of the molding process. The glass became wider and flatter, and the quality became higher and higher. On September 23, 1971, under the guidance of department leaders and relevant experts, and with the full cooperation of fraternal units, the cadres and workers of Luoyang University worked together for more than three months and finally successfully built the first float. The glass production line produced my country's first piece of float glass. Its mechanical strength, flatness and light transmittance are superior to other flat glass. With his superhuman wisdom and hard work, Luo Bo realized the Chinese people's float dream. From 1971 to 1981, CLFG implemented large-scale technical transformation on this line three times. The melting capacity of the production line reached 225 tons, the plate width exceeded 2 meters, and the overall yield reached 76.96%. At the end of 1978, In early 1979, thinner 4 mm glass was stably produced. The technology and equipment of "Luoyang Float Glass Process" were also improved day by day, and the technical level was continuously improved. From April 27 to 30, 1981, the State Science and Technology Commission organized glass experts and scholars across the country and leaders of relevant departments to hold a national technical appraisal meeting for the "Luoyang Float Glass Technology" in Luoyang. At the third national technical appraisal meeting after the hydraulic press, the meeting officially named this process China's "Luoyang Float Glass Technology" and awarded the Gold Medal for Creation and Invention. The birth of "Luoyang Float Glass Craft" in Luoyang Glass ended an old era, ushered in a new dawn for the development of China's glass industry, opened up a new era of reform, innovation and development of China's glass industry, and laid the foundation for the development of my country's glass industry. The development has erected a majestic monument and has become one of the world's three major float processes in the world's glass industry, along with the British Pilkington float and the American Pittsburgh float.
Edit this section product advantages: It is in a tin bath, and the glass floats on the surface of the tin liquid. Therefore, this kind of glass is first of all flat and has no water ripples. Used for mirror making and automotive glass. It doesn't look awkward or lose its shape, which is one of its great advantages. Secondly, the ore quartz sand used in float glass has good raw materials. The glass produced is pure and has good transparency. Bright and colorless. No glass boils, bubbles or the like. Third, the structure is compact, heavy, and smooth to the touch. It has a higher specific thickness per square meter than a flat plate, is easy to cut, and is not easily damaged. More than 200 production lines across the country are produced in strict accordance with national standards. This kind of glass is the best glass for civil buildings. Its price, with the same thickness, is only about 4 yuan higher per square meter than flat glass. Edit this paragraph production process The forming process of float glass production is completed in a tin bath where protective gas (N2 and H2) is introduced. Molten glass continuously flows from the tank kiln and floats on the surface of the relatively dense tin liquid. Under the action of gravity and surface tension, the molten glass spreads and flattens on the tin liquid surface, forming an upper and lower surface that is smooth, hardened, and cooled. Then he was led to the transition roller table. The rollers on the roller table rotate, pulling the glass ribbon out of the tin bath and into the annealing kiln. After annealing and cutting, flat glass products are obtained. Compared with other forming methods, the advantages of float method are: It is suitable for manufacturing high-quality flat glass with high efficiency, such as no corrugation, uniform thickness, smooth upper and lower surfaces, and parallel to each other; the scale of the production line is not limited by the forming method, and the energy of the unit product is Low consumption; High utilization rate of finished products; Easy to scientifically manage and realize full-line mechanization and automation, with high labor productivity; The continuous operation cycle can last for several years, which is conducive to stable production; It can provide suitable conditions for online production of some new varieties, such as Electric float reflective glass, spray film glass during annealing, cold end surface treatment, etc. The sound insulation performance of a single piece of float glass is poor. Its performance is based on GB/T8485-2002 "Classification of Air Sound Insulation Performance of Building Exterior Window and its Testing Methods" and GBJ75-1984 "Code for Measurement of Building Sound Insulation", and with reference to international The standards ISO140 and ISO717 use the weighted sound insulation quantity Rw to measure the sound insulation performance index, and its unit is dB; another sound insulation performance index STC can be used as a reference index. Edit this paragraph and the difference between ordinary glass What is the difference between ordinary flat glass and float glass A: Ordinary flat glass and float glass are both flat glass. It’s just that the production process and quality are different. Ordinary flat glass is made of quartz sandstone powder, silica sand, potassium fossil, soda ash, Glauber's salt and other raw materials, prepared in a certain proportion, melted at high temperature in a furnace, and produced through vertical drawing, flat drawing, and calendering methods. It is transparent and colorless. plate glass. Ordinary flat glass is divided into three categories: special selection, first-class product, and second-class product according to appearance quality. According to thickness, it is divided into five types: 2, 3, 4, 5 and 6mm. B: Float glass is made of sea sand, quartz sandstone powder, soda ash, dolomite and other raw materials. It is prepared in a certain proportion and melted at high temperature in the furnace. The glass liquid continuously flows from the furnace to the liquid metal and floats on the surface of the metal. It is spread into A transparent, colorless flat glass made from a fire-polished glass ribbon with uniform thickness, separated from the molten metal after cooling and hardening, and then annealed and cut. The glass surface is particularly flat and smooth, the thickness is very uniform, and the optical distortion is very small. Float glass is divided into three categories: high-quality products, first-class products, and qualified products according to appearance quality. According to thickness, it is divided into nine types: 3, 4, 5, 6, 8, 10, 12, 15 and 19mm. C: The appearance quality grade of ordinary flat glass is determined based on the number of defects such as corrugated ribs, bubbles, scratches, sand grains, bumps, and lines. The appearance quality grade of float glass is judged based on the number of defects such as optical deformation, bubbles, inclusions, scratches, lines, fog spots, etc. D: Ordinary glass, emerald green, fragile, low transparency, easy to age and deform under rain and sun exposure. Float glass. Transparent float glass is glass paste that enters the tin bath through the control gate and floats due to gravity and its own surface tension. After being placed on the surface of molten tin, it then enters the slow cooling tank to make both sides of the glass smooth and even, and the ripples disappear. Dark green, smooth surface without ripples, good perspective, and certain toughness. E: The production process of float glass is different from that of ordinary glass. The advantage is that the surface is hard, smooth and flat. The color of float glass is different from ordinary glass when viewed from the side. It is whitish and the object is not distorted after reflection, while ordinary ones have water lines. type deformation.