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Glass tempering furnace, also known as glass tempering equipment, usually uses the physical method to heat the glass to near the softening point ( 650 ℃ ), blowing quenching, forming compressive stress layer on the surface of the glass, forming tensile stress layer inside; When the glass is subjected to an external force, the compressive stress layer can cancel part of the tensile stress.

Glass furnaces are divided into crucible furnace, intermittent furnace and continuous furnace.

There are many forms of heat preservation in glass annealing furnace. according to the classification of heat-treated glass, the common forms are as follows: ① heat preservation basis of mesh belt type glass annealing furnace It is mainly used for primary annealing of daily glass and lighting glass such as glass bottle, glass utensil, etc., and secondary stress relief annealing after re - processing. the total length of the furnace body is 6 - 40m, and the maximum service temperature is 650 ℃.