Method for manufacturing glass and glass

A manufacturing method and glass technology, applied in glass manufacturing equipment, glass tempering, manufacturing tools, etc., can solve the problems of rising manufacturing costs, poor productivity, high frequency of molten salt replacement, etc., to achieve reduced replacement frequency, increased surface compressive stress, The effect of high-strength protective performance

Inactive Publication Date: 2012-11-14
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the addition or replacement of the molten salt is performed using the surface compressive stress of the treated glass as an index. However, in the conventional method, the decrease in the surface compressive stress occurs early, so the frequency of replacement of the molten salt is high. Therefore, there is a problem that the manufacturing cost increases and the productivity is also poor.

Method used

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  • Method for manufacturing glass and glass
  • Method for manufacturing glass and glass
  • Method for manufacturing glass and glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] First, expressed as SiO in terms of mole percentages based on oxides 2 64.3%, Na 2 O 12.0%, K 2 O 4.0%, MgO 11.0%, CaO 0.1%, SrO 0.1%, Al 2 o 3 6.0% and ZrO 2.5% are blended and mixed, and the raw material mixture is put into a melting furnace and melted at about 1500° C., and then the molten glass is supplied into the float tin bath 3 . In the float tin bath 3 , glass is formed into ribbons on molten tin, and the glass is conveyed to the rear part 5 of the shield.

[0119] In the rear part 5 of the protective cover, as a sodium concentration reduction treatment, sulfurous acid gas is sprayed on the glass surface to make Glauber's salt (NaSO 4 ) precipitated on the glass surface.

[0120] Next, after cooling, it was cut to an appropriate size to obtain plate-shaped glass with a thickness of 1 mm.

[0121] This glass is not subjected to water washing treatment but to chemical strengthening treatment. Chemical strengthening treatment using potassium nitrate (KNO ...

Embodiment 2

[0123] Glass was prepared in the same manner as in Example 1, except that the glass cut into a plate was washed with water prior to the chemical strengthening treatment.

Embodiment 3

[0125] Glass was prepared in the same manner as in Example 1, except that the amount of sulfurous acid gas sprayed onto the glass surface was larger than in Example 1.

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Abstract

The invention provides a method for manufacturing glass capable of producing glass substrates which have good performances and high strength and good protective functions even the substrates are thin. In the method of manufacturing glass, after a sodium concentration reduction process for making sodium concentration on a glass surface lower than sodium concentration in the central part of glass, a chemical reinforcement processing process is performed in which the glass is dipped in fuse salt containing potassium ions to replace part of sodion in the glass with the potassium ion.

Description

technical field [0001] The present invention relates to glass such as a cover glass used for touch panel display devices such as display devices, mobile phones, and PDAs, and a method for manufacturing the glass. Background technique [0002] In recent years, display devices, mobile devices such as mobile phones and PDAs have often used cover glass to protect the display and improve the appearance. [0003] With the miniaturization of equipment, the weight and thickness of the protective glass are required to be reduced. For example, in mobile equipment, thinner glass is used every time the equipment is updated. [0004] However, if the thickness of the glass is reduced, the strength will decrease and it will be easily broken by dropping or the like. Therefore, in addition to thinning the glass, it is required to have high strength so as to obtain good protection performance. [0005] The strength of glass is generally improved by forming a compressive stress layer on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B27/03C03C21/00G09F9/30
Inventor 山本宏行饭田雄一
Owner ASAHI GLASS CO LTD
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