Glass in the heating furnace heated to near the softening temperature, and glass quickly into the different cooling intensity of the wind gate, uneven cooling of glass, glass as the main view area and the surrounding area have different stress and surrounding area in the strong wind wind grid position and tempered, fragments of this location is good, high strength tempered and visual area in the wind gate weak cold position, large fragments, tempered strength low, using this method of production of glass is the region of glass.
