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Method for manufacturing glass substrate and device for manufacturing glass substrate
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A technology of glass substrate and manufacturing method, applied in glass manufacturing equipment, glass melting device, glass forming and other directions, can solve problems such as difficulty in realization
Active Publication Date: 2015-01-21
AVANSTRATE INC
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Problems solved by technology
Especially, when using the float method to manufacture glass substrates from molten glass, it is relatively easy to increase the slow cooling furnace and reduce the slow cooling rate, but when using the down draw method (down draw method) to manufacture glass substrates, increasing the slow cooling speed is relatively easy. Furnace is difficult to realize in terms of equipment or operation
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Embodiment 1
[0210] In order to confirm the effect of this embodiment, molten glass was produced in a melting tank, and the glass substrate was produced. Specifically, use Figure 5 , 6 The shown melting tank 101 melts glass raw materials to make molten glass, and then performs a clarification step. figure 1 The steps shown to fabricate a glass substrate.
[0211] The glass composition of the manufactured glass substrate is as follows.
[0212] SiO 2 : 70.5 mol%,
[0213] Al 2 o 3 : 10.9 mol%,
[0214] B 2 o 3 : 7.4 mol%,
[0215]The total amount of MgO, CaO, SrO and BaO: 10.9 mol%.
[0216] In addition, the strain point of the produced glass substrate was 709° C., and the specific resistance in the state of molten glass at 1550° C. was 195 Ω·cm.
[0217] In addition, in the melting step, molten glass was prepared under the following melting conditions in which the calorific value ratio was changed, and the number of bubbles and unmelted defects remaining in the manufactured gl...
Embodiment 2
[0226] Furthermore, using the glass composition 2 different from the glass composition used in Example 1, the glass substrate was manufactured by the method similar to Example 1. The glass composition of Example 2 is as follows.
[0227] SiO 2 : 66.6 mol%,
[0228] Al 2 o 3 : 10.6 mol%,
[0229] B 2 o 3 : 11.0 mol%,
[0230] The total amount of MgO, CaO, SrO and BaO: 11.4 mol%.
[0231] In addition, the strain point of the manufactured glass substrate was 660° C., and the specific resistance in the state of molten glass at 1550° C. was 165 Ω·cm.
[0232] In addition, by the same method as in Example 1, the number of defects of bubbles and unmelted matter remaining in glass substrates produced by changing the melting conditions in the melting step was investigated. The calorific value ratio and arch temperature were obtained by the same method as in Example 1. The number of bubbles in Tables 3 and 4 is represented by a ratio when the number of bubbles in Example 4 is ...
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Abstract
A method for manufacturing a glass substrate, including: a step for melting a raw glass material in order to form glass that includes tinoxide and is difficult to melt, by combustion heating in a gas phase by a combustion means and joule heating by causing a current to flow in molten glass, within a melting pot; and a clarifying step for clarifying the molten glass by a redox reaction of the tinoxide. The combustion heating and the joule heating are performed such that a heat ratio of heat from the combustion heating to heat from the joule heating is 1.0 to 3.4. When making molten glass to become glass that has a viscosity of 102.5 poise at a temperature of 1580˚C or greater, the heat ratio is 1.0 to 2.8.
Description
technical field [0001] The present invention relates to a manufacturing method of a glass substrate for manufacturing a glass substrate, and a glass substrate manufacturing apparatus for performing the manufacturing method. Background technique [0002] In recent years, in the field of display panels, in order to improve image quality, high-definition pixels have been advanced. With the advancement of this high-definition, high-quality glass substrates used for display panels are also expected. For example, in the manufacturing process of a panel, a glass substrate having a small thermal shrinkage is required so that a glass substrate heat-treated at a high temperature is less prone to dimensional change. In addition, for the glass substrate used in the liquid crystal display panel, from the viewpoint of preventing TFT (Thin Film Transistor, thin film transistor) from deteriorating the characteristics, use a glass substrate that does not contain or hardly contains Li 2 O, ...
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Application Information
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