What is the difference between sheet glass and float glass ?
Sheet glass and float glass are all flat glass. Only the production process and quality are different.
Sheet glass is made of quartz sandstone powder, silica sand, potassium fossil, soda ash, mirabilite and other raw materials, prepared by a certain proportion, melted at a high temperature in a melting furnace, and produced by a transparent vertical drawing method, a flat drawing method and a calendering method. glass. Sheet glass is divided into special products, first-class goods, and second-class goods according to the appearance quality. According to the thickness is divided into five kinds of 2,3,4,5,6mm.
Float glass is made of sea sand, quartz sandstone powder, soda ash, dolomite and other raw materials, prepared by a certain proportion, melted at a high temperature in a melting furnace, and the glass liquid continuously flows from the pool kiln to the surface of the metal liquid and spreads into a uniform thickness. Flat, fire-polished glass ribbon, cooled and hardened to separate from molten metal, and then cut through annealed transparent colored flat glass. The glass surface is particularly smooth and flat, and its thickness is very uniform. Optical distortion is very small. Float glass is classified according to appearance quality into excellent products, first grade products and qualified products. According to the thickness is divided into 2,3,4,5,6,8,10,12,15,19mm.
The appearance quality grade of sheet glass is judged by the number of flaws, bubbles, scratches, sand grains, flaws, and line defects. The appearance quality grade of float glass is judged by the number of defects such as optical distortion, bubbles, inclusions, scratches, lines, and fog.
The forming process of the float process is performed in a tin bath that opens into a protective gas (N2 and H2). The 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 glass liquid spreads on the surface of the tin liquid, flattened, forms the upper and lower surfaces, flattens, hardens, and cools. After being introduced on the transition roller table. The rollers of the roller table are rotated, and the glass ribbon is pulled out of the tin bath into the annealing kiln. After annealing and cutting, a flat glass product is obtained. Compared with other forming methods, the float method has the advantages that it is suitable for high-efficiency production of flat glass, if there is no striae, the thickness is uniform, the upper and lower surfaces are flat and parallel to each other; the scale of the production line is not limited by the forming method, and the energy per unit product Low consumption; high product utilization rate; easy scientific management and realization of total mechanization, automation, high labor productivity; continuous operation cycle can be as long as several years, is conducive to stable production; can provide suitable conditions for online production of some new varieties, Such as electric float glass, annealing glass, cold end surface treatment.
The lattice method is also called Gwabbelpin Rafah, also known as Deep Pool Flat Rafah, and is a Belgian improvement of the shallow pond.
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