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Manufacturing method of flat glass

A technology of flat glass and manufacturing method, applied in glass production and other directions, to achieve the effect of less damage and saving supply

Active Publication Date: 2018-09-21
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] Patent Document 2 discloses that 0 to 5 mol% of B 2 o 3 glass, but the average coefficient of thermal expansion at 50-300°C exceeds 50×10 -7 / °C

Method used

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  • Manufacturing method of flat glass
  • Manufacturing method of flat glass
  • Manufacturing method of flat glass

Examples

Experimental program
Comparison scheme
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Embodiment 1～9、 comparative example 1～3

[0141] The raw materials of each component were prepared so as to have the target composition shown in Table 1, melted in a continuous melting kiln, and formed into a flat plate by a float method. Na as the content of the alkali metal oxide in the raw material used at this time 2 Content of O, median diameter D which is the particle size of silica sand in the raw material used 50 , the proportion of particles with a particle diameter of 5 μm or less, and the proportion of particles with a particle diameter of 100 μm or more are shown in Table 1 together. In addition, the molar ratio (in terms of MO) of the hydroxide raw material in the alkaline earth metal is also shown in Table 1 together.

[0142] After mirror polishing was carried out to the obtained glass, at the heat treatment temperature shown in table 2, heat treatment time, SO 2 and / or SO 3 Gas concentration, water vapor dew point in SO 2 and / or SO 3 The heat treatment is carried out in a gas atmosphere. The sulf...

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Abstract

　The present invention relates to a method for manufacturing sheet glass comprising melting a glass raw material to obtain molten glass, forming the molten glass into a sheet-shaped glass ribbon in a forming device, and then annealing the glass ribbon in an annealing device, the sheet glass comprising non-alkali glass, and SO2 and / or SO3 glass being supplied so the atmospheric concentration of SO2 and / or SO3 directly below the bottom surface of the glass ribbon is 500-20000 ppm for at least 30 seconds in a temperature range of Tst + 70°C to Tst − 50°C, where Tst°C is the strain point of the non-alkali glass.

Description

technical field [0001] This invention relates to the manufacturing method of the plate glass containing an alkali-free glass suitable as substrate glass for various displays, and the substrate glass for photomasks. [0002] Hereinafter, in this specification, when referring to "no alkali", it means alkali metal oxide (Li 2 O, Na 2 O, K 2 The content of O) is 2000 mol ppm or less. Background technique [0003] Conventionally, the characteristics shown below have been required for various substrate glasses for displays, especially substrate glasses for displays on which a metal or oxide thin film or the like is formed on the surface. [0004] (1) When alkali metal oxides are contained, the alkali metal ions diffuse into the film to degrade the film properties. Therefore, the content of alkali metal oxides is required to be extremely low, specifically, the content of alkali metal oxides is required to be 2000 mol ppm the following. [0005] (2) In order to minimize shrinka...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C3/091C03B1/00C03B18/14C03B25/08C03C1/00C03C3/093C03C17/22
CPCC03B25/08C03C3/091Y02P40/57
Inventor 德永博文小野和孝谷井史朗
Owner ASAHI GLASS CO LTD