Coated Glass Tempering

The key factor which must be taken into account when tempering glass with a low-emissivity coating or glass for subsequent off-line coating is the heating of the glass to an even temperature while preserving the quality and integrity of the coating. It has been found that forced convection and heat focusing are the solutions to tempering Low-E glass and finding the optimum balance between convection, radiation and conduction during the tempering process. Glass movement and accurate position control are also important. The uneven heat absorption of Low-E glass can cause tempering problems, such as the excessive heat decrease in the rollers' surface temperature.