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The forming process of float glass production is completed in a tin bath filled with protective gases (N2 and H2). Molten glass continuously flows in from the tank kiln and floats on the surface of tin liquid with relatively high density. Under the action of gravity and surface tension, the glass liquid is spread and leveled on the tin liquid surface, and the upper and lower surfaces are flat, hardened and cooled before being led to the transition roller table. The rollers of the roller table rotate to pull the glass ribbon out of the tin bath and enter the annealing kiln. After annealing and cutting, the float glass product is obtained. Compared with other molding methods, the advantages of float method are: it is suitable for manufacturing high-quality flat glass with high efficiency, such as no ribs, uniform thickness, flat 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 consumption per unit product is low; High utilization rate of finished products; Easy to manage scientifically and realize mechanization and automation of the whole line, with high labor productivity; The continuous operation cycle can be as long as several years, which is beneficial to stable production; It can provide suitable conditions for online production of some new varieties, such as electro-flotation reflective glass, spraying film glass during annealing, cold end surface treatment and so on