Method for making thermal reinforced glass
A technology of heat-strengthening glass and manufacturing method, applied in glass manufacturing equipment, glass tempering, manufacturing tools, etc., can solve problems such as increased plate glass deformation, adverse effects on glass surface smoothness, reduced commodity value, etc. The effect of reducing, increasing the degree of strengthening, and suppressing temperature reduction
Inactive Publication Date: 2005-06-08
NIPPON SHEET GLASS CO LTD
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Problems solved by technology
[0005] However, if the temperature from the heating furnace is increased, the possibility of deformation of the plate glass will increase during the process of conveying the plate glass in the heating furnace.
In addition, in the case of conveying by a large number of conveying rollers, the smoothness of the glass surface will also be adversely affected, resulting in a decrease in product value
Method used
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[0025] The best embodiment of the method for manufacturing heat-strengthened glass of the present invention will be described below with reference to the accompanying drawings.
[0026] The glass to be strengthened in this manufacturing method is, for example, plate glass G with a thickness greater than 5 mm. figure 1 The thermal strengthening device shown has a heating furnace 1 , a cooling device 2 and an oscillating device 3 for thermal strengthening treatment.
[0027] The aforementioned heating furnace 1 has a heater or a flame not shown in the figure for heating inside. A plurality of rollers 4 for a heating furnace are installed in this heating furnace, and the plate glass G is conveyed in the arrow direction by the rollers 4 .
[0028] The aforementioned cooling device 2 is equipped with upper and lower pairs of cooling units 5, 6 having air inside. The top of the upper cooling unit 5 is connected to the blower 7 , and the bottom of the lower cooling unit 6 is connec...
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A method of manufacturing heat-strengthened glass that reliably suppresses deformation during transportation in a heating furnace even when it is subjected to super-strength heat-strengthening, and when glass with a large plate thickness and self-heavy weight is used as the object of strengthening. Specifically, the tempered glass G is heated in a heating furnace to a temperature above the deformation point and below the softening point, and then the surface of the glass G is cooled. The method of manufacturing thermally strengthened glass in which the temperature difference of the part is thermally strengthened. By locally heating the central part of the aforementioned glass with electromagnetic waves in the millimeter wave range, the temperature difference between the surface and the central part of the glass cooled to the aforementioned deformation point is guaranteed to be as specified. Therefore, the glass G is heated only by the heating furnace 1, and the glass G is released from the heating furnace at a surface tapping temperature lower than the tapping temperature of the glass surface at the time of tapping.
Description
technical field [0001] The present invention relates to a method of manufacturing heat-strengthened glass. Specifically, the glass to be strengthened is heated in a heating furnace to a temperature above the deformation point and below the softening point, and then the glass surface is cooled. When the surface of the glass is cooled to the deformation point A method of manufacturing heat-strengthened glass that is strengthened by the temperature difference between the glass surface and the center. Background technique [0002] In this method of thermal strengthening of glass, the degree of thermal strengthening of glass depends on the temperature difference between the glass surface and the center at the deformation point during cooling, and the greater the temperature difference, the greater the degree of thermal strengthening. [0003] In order to increase the temperature difference between the surface and the center of the glass at the deformation point, it has been propo...
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Login to View More IPC IPC(8): C03B27/012C03B27/00C03B27/044C03B29/08
CPCC03B27/044C03B29/08
Inventor 结城一哲加藤浩昭中冈英一
Owner NIPPON SHEET GLASS CO LTD