Method for manufacturing glass plate
A manufacturing method and technology for glass sheets, which are applied in glass manufacturing equipment, glass production, manufacturing tools, etc., can solve the problems of out-of-air bubbles, difficult-to-melt glass, glass devitrification and coloring, etc., and achieve the effect of reducing bubbles
Active Publication Date: 2015-12-09
AVANSTRATE INC
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Problems solved by technology
[0007] However, glass plates that do not contain alkali metal components or contain a small amount of alkali metal components in order to suppress the deterioration of the characteristics of semiconductor components have the following problems: high-temperature viscosity is high compared with glass plates containing a large amount of alkali metals such as soda lime glass, and it is difficult to Extraction of air bubbles from molten glass in manufacture
Due to SnO 2 or Fe 2 o 3 It will cause devitrification and coloring of the glass, so in order to ensure that it is compatible with As 2 o 3 Equivalent clarification without being added to glass in large quantities
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[0045] Hereinafter, the manufacturing method of the glass plate of this embodiment is demonstrated.
[0046] (Overall outline of glass plate manufacturing method)
[0047] figure 1 It is a process chart of the manufacturing method of the glass plate of this embodiment.
[0048] The manufacturing method of the glass plate mainly includes a melting step (ST1), a clarification step (ST2), a homogenization step (ST3), a supply step (ST4), a forming step (ST5), an annealing step (ST6), and a cutting step (ST7). ). In addition, it includes a grinding step, a polishing step, a cleaning step, an inspection step, a packing step, etc., and then the plural glass plates laminated in the packing step are transported to the supplier of the ordering party.
[0049] figure 2 It is a figure which shows typically the glass substrate manufacturing apparatus which performs a melting process (ST1)-a cutting process (ST7). The device is like figure 2 As shown, it mainly includes a melting device 200, a...
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Abstract
This method for manufacturing a glass plate includes a melting step, a fining step, and a forming step. In the melting step, molten glass is produced by using at least electrical heating to melt a glass feedstock containing SnO2 as a fining agent. The fining step includes the following: a bubble-removal process in which the temperature of the molten glass is raised to at least 1,630°C so as to generate bubbles therein in order to perform bubble removal; and an absorption process, after the bubble-removal process, in which the temperature of the molten glass is reduced at a rate of at least 2°C / min over the temperature range from 1,600°C to 1,500°C so as to make the molten glass absorb the bubbles therein. In the forming step, a down-draw process is used to form the post-fining-step molten glass into plate glass.
Description
[0001] This application is a divisional application. The Chinese national application number of the parent case is 201280003081.X, and the international application number of the parent case is PCT / JP2012 / 006538. The filing date is October 11, 2012, and March 26, 2013. Japan entered China, and its invention was titled "Method for Manufacturing Glass Plates". Technical field [0002] The invention relates to a method of manufacturing a glass plate. Background technique [0003] In a glass substrate used for a flat panel display (hereinafter referred to as "FPD") such as a liquid crystal display or a plasma display, a thin glass plate having a thickness of, for example, 0.5 to 0.7 mm is used. This glass substrate for FPD has a size of 300×400 mm in the first generation, but has a size of 2850×3050 mm in the tenth generation. [0004] In order to manufacture such large-sized glass substrates for FPD after the 8th generation, the overflow downdraw method is most often used. The overfl...
Claims
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IPC IPC(8): C03B5/225
CPCC03B5/225C03B5/187C03B5/43Y02P40/57
Inventor 君岛哲郎村上次伸
Owner AVANSTRATE INC