Sales of glass tempering furnace, glass and steel furnaces Suppliers, Landglass Glass Tempering Furnace

[] Glass tempering furnace, glass tempering furnace sales, Landglass glass tempering furnace is provided by Randy machines. Glass Tempering Furnace, Randy machine glass tempering furnace, glass furnace steel suppliers Randy Luoyang Glass Machinery Co., Ltd. (www.landglass.com) 2014 has been newly upgraded launched five, coated Low-E glass and steel coated glass especially steel production Low-E glass is the most problems, the most difficult to master the technical parameters of a glass in the presence of steel production. When the coated glass and Low-E glass tempering glass up and down the biggest difficulty is not the same on both sides of the heat absorption rate. Glass surface has a high emissivity (approximately 0.9), the surface temperature rises too fast, but low emissivity coated surface (as low as 0.1 to 0.23), the heating process a large amount of the reflected radiation, by thermal radiation is not easy transmitted to the inner surface of the glass. This asymmetric heat absorption rate, resulting in an asymmetric upper and lower surfaces of the glass sheet temperature, causes bending glass, from a variety of defects fog, falling film, optical distortion, arcuate and the like. Glass deformed mainly from two aspects, the first issue is the precision roller, the second is the problem of uneven stress. 1.2 due to the heating caused by the thermal deformation temperature unevenness exists 1.2.1 glass surface temperature difference during the heating up and down, when the glass is delivered to the heated rollers, the lower surface of the glass in contact with the roller, the heating roller directly conducting manner glass by heat exchange, on the surface of the glass on the surface of the glass is heated by way of heat radiation, the heat transfer rate is higher than the upper surface of the lower surface of the heat transfer rate, when the thermal equilibrium is not taken when the auxiliary heating, the surface temperature of the glass lower than the temperature of the lower surface, and at the start of heating the glass is a typical elastomer, the thermal expansion coefficient and relatively high glass (linear expansion coefficient of the glass was 9 × 10 / .C), since the surface temperature is higher than the temperature of the upper surface , the expansion rate is higher than the upper surface of the lower surface of the glass that is bent upward from the glass surrounding Alice roller to form an intermediate glass is heated, and is only the middle roller support, when the glass is further heated in contact with the roller position First to reach the softening temperature and subjected to the full weight of the glass, the middle of the glass will occur "floating" deformed, resulting in thinning of the site and asked the roller prints and even optical distortion. On the other hand when all the glass is heated to the softening temperature of the glass flattened, but the temperature difference did not disappear with the temperature difference between the glass is uniformly cooled to room temperature, the contraction is greater than the cold surface of the glass heat shrinkage to form the heat curved surface.