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Reasons for poor flatness of flat tempered glass
- Jan 14, 2017 -

(1) glass is heated up and down caused by the temperature difference at the surface of the glass distortion

① tempered glass Board face upward. This phenomenon is due to glass in heating furnace within was heating Hou, appeared glass Shang surface of temperature above Xia surface of temperature of situation, keep this temperature State of glass into cooling room cooling, in cooling process in the, dang glass upper and lower surface of cooling temperature and wind pressure, conditions same Shi, due to glass Shang surface temperature high, cooling Hou Shang surface of contraction volume is greater than Xia surface, will appeared glass oriented Shang bent deformation of phenomenon.

This is the case, can raise the temperature of the heating furnace bottom to minimize upper and lower temperature differences on the surface of the glass.

II tempered glass plate bend downward. This phenomenon is due to glass in heating furnace within was heating Hou, appeared glass Xia surface of temperature above Shang surface of temperature of situation, keep this temperature State of glass into cooling room cooling, in cooling process in the, dang glass upper and lower surface of cooling temperature and wind pressure, conditions same Shi, due to glass Xia surface temperature high, cooling Hou Xia surface of contraction volume is greater than Shang surface, will appeared glass oriented Xia bent deformation of phenomenon. This is the case, can reduce bottom of furnace temperature to minimize upper and lower temperature differences on the surface of the glass.

(2) glass in the middle and edges caused by the temperature difference on heating deformation of glass

Glass in heating furnace within after heating Hou, if its middle parts of temperature above side Department of temperature, so in cooling process in the, glass Shang temperature high of middle parts of contraction volume, will is greater than temperature lower of side Department of contraction volume, dang glass was cooling to at room temperature State Shi, glass of side Department size on will is greater than middle parts of size, in glass of side Department formed larger of pressure stress, to appeared glass oriented Xia bent deformation of phenomenon.

Also, glass in heating furnace within after heating Hou, if its side Department of temperature above middle parts of temperature, so in cooling process in the, glass Shang temperature high of middle parts of contraction volume will is greater than temperature lower of side Department of contraction volume, dang glass was cooling to at room temperature State Shi, glass middle parts of size on will is greater than side Department of size, in glass of side Department formed larger of tensile stress, to appeared glass oriented Shang bent deformation of phenomenon.