The difference between float glass and ordinary glass

Ordinary flat glass

Ordinary flat glass is a transparent five-color flat plate produced by quartz sandstone powder, silica sand, potassium fossil, soda ash, thenardite and other raw materials, prepared according to a certain ratio, melted at a high temperature in a melting furnace, and produced by a vertical lead-up method or a flat pull method or a calendering method. glass. Ordinary flat glass is divided into three categories according to the quality of appearance, first-class products and second-class products. According to the thickness, it is divided into five types: 2, 3, 4, 5, and 6 mm.

Ordinary flat glass

The float glass is prepared by using sea sand, quartz sandstone powder, soda ash, dolomite and other raw materials according to a certain ratio. After melting at a high temperature, the molten glass flows continuously from the kiln to the metal surface, and is evenly spread. A flat, fire-polished glass ribbon, which is cooled and hardened and then detached from the molten metal, and then annealed and cut into a transparent five-color flat glass. The surface of the glass is particularly smooth and smooth, the thickness is very uniform, and the optical distortion is small. According to the appearance quality, float glass is divided into three categories: excellent products, first-class products and qualified products. According to the thickness, it is divided into three types: 3, 4, 5, 6, 8, 10, and 12 mm.

The appearance quality grade of ordinary flat glass is determined according to the number of defects such as ribs, bubbles, scratches, sand, enamel, and lanes. The appearance quality level of float glass is judged based on the number of defects such as optical distortion, bubbles, inclusions, scratches, lines, and fog spots.

Float glass

The forming process of the float process is carried out in a tin bath with protective gas (N2 and H2). The molten glass continuously flows from the kiln and floats on the surface of the relatively dense tin liquid. Under the action of gravity and surface tension, the molten glass spreads on the tin surface, flattens, and the upper and lower surfaces are flattened, hardened and cooled. After being introduced into the transition roller table. The roller of the roller table rotates, and the glass ribbon is pulled out of the tin bath into the annealing kiln, and after annealing and cutting, a flat glass product is obtained. Compared with other forming methods, the float method has the advantages of being suitable for high-quality manufacture of high-quality flat glass, such as no ribs, uniform thickness, flat top and bottom 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 Low consumption; high utilization rate of finished products; easy to scientifically manage and realize full mechanization and automation, high labor productivity; 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 electro-float reflective glass, sprayed film glass during annealing, cold-end surface treatment, etc.

Float glass

The Gefa is also called Graviber Pira, also known as the deep pool Pingla method, which is an improvement of the Belgian on the shallow pool.

Text: Jin Hao

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