JP2004107130A - Chemically strengthened glass product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a process for fixing cut, chemically strengthened glass to prevent its breakage at use. <P>SOLUTION: In a chemically strengthened glass product, the cut, chemically strengthened glass is fixed by placing its edge at the outer side of a fixing member. Here, provided that d is the thickness of the chemically strengthened glass, the distance L between the edge of the chemically strengthened glass fixed and the edge of the fixing member is d≤L≤20d, and the width W of the fixing member is d≤W≤10d. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is useful when fixing chemically strengthened glass, particularly cut chemically strengthened glass, and in the field of electronic materials used for touch panels and the like, for automobiles and buildings, etc. Related to many areas.
[0002]
[Prior art]
From the viewpoint of resource saving and energy saving or changes in social needs, the tempered glass is becoming thinner and the degree of strengthening is increasing. Since it is difficult to produce a glass having a plate thickness of 3 mm or less, particularly 2 mm or less by a commonly used air-cooling tempering method, a chemical strengthening method is often used for glass of 2 mm or less. Another characteristic of chemically strengthened glass that it can generally obtain higher strength than tempered glass produced by the air-cooling method is the market acceptance.
[0003]
Various methods have been considered as a method for producing chemically strengthened glass. Many methods have been used to replace atoms having a small ionic radius with atoms having a large ionic radius, and are typical. However, conversely, using a viscous flow of glass to replace atoms with a large ionic radius with atoms with a small ionic radius, a method using a difference in thermal expansion coefficient, a method of crystallizing a crystal, and a method of combining the above methods Many methods have been proposed.
[0004]
The reason why chemically strengthened glass is widely accepted in the market is that, in addition to the fact that thin glass as described above can be strengthened, high strength can be obtained, and that tempered glass can be cut. In the case of a tempered glass, if a crack is introduced to cut the glass, the glass breaks into pieces, so that the glass cannot be cut.
[0005]
In the chemically strengthened glass manufactured by the ion exchange method, the glass surface is under compressive stress. However, the ends of the cut chemically strengthened glass are in the same state as those not chemically strengthened, that is, the strength is the same as that of untreated glass. For this reason, it is necessary to pay attention to the edge portion when the glass is chemically strengthened and cut.
[0006]
On the other hand, the central part and the uncut end have the effect of the chemical strengthening treatment, and the glass surface is under compressive stress. Therefore, when chemically strengthened glass is cut, the glass has both properties of tempered glass and untreated glass. For this reason, the breaking phenomenon of glass often takes complicated behavior.
[0007]
According to the known art, for example, a glass substrate to be subjected to a chemical strengthening process, a method for manufacturing the glass substrate, and an electronic device having the glass substrate (for example, see Patent Document 1) are formed so as to cover the surface and the end of the display cell. A method is disclosed in which an insulated protective layer (for example, see Patent Document 2) and a glass substrate that is reliably carried out from a transport cassette called a pass box (for example, see Patent Document 3).
[0008]
[Patent Document 1]
JP-A-2002-160932
[Patent Document 2]
JP-A-54-143160
[Patent Document 3]
JP-A-8-8322
[Problems to be solved by the invention]
Chemically tempered glass is severable. However, even if it can be cut, this cutting is a very difficult technique, and many breakage problems have occurred even after it has been manufactured.
[0012]
For example, in a chemically strengthened thin glass used for a touch panel or the like, an attempt is made to increase productivity by taking a plurality of large chemically strengthened glass sheets. However, there has been a problem that a panel using chemically strengthened glass scribed by a wheel tip type cutting machine breaks even if the value is smaller than an assumed load after being put on the market. This is partly due to the lack of a suitable method for fixing chemically strengthened glass. As described above, the technology for effectively fixing the cut chemically strengthened glass is not yet established.
[0013]
That is, Japanese Patent Application Laid-Open No. 2002-160932 discloses that a cut glass is subjected to a chemical strengthening treatment and used, but does not disclose a method of increasing the strength of the chemically strengthened glass or a method of fixing the same. The method disclosed in Japanese Patent Application Laid-Open No. 54-143160 is a method for extending the life of a cell, and is not a technique directly leading to improvement in the strength of glass. Further, in Japanese Patent Application Laid-Open No. 8-8322, it is possible to obtain information relating to glass conveyance, that is, fixing of glass. However, even in such a pass-through box, glass is frequently broken.
[0014]
[Means for Solving the Problems]
According to the present invention, the cut chemically strengthened glass can be used without breaking. The present invention is a chemically strengthened glass product characterized in that, when fixing the cut chemically strengthened glass, the glass end is outside the fixing member.
[0015]
When the thickness of the chemically strengthened glass is d, the distance L between the glass end and the fixing member end is fixed such that d ≦ L ≦ 20d.
[0016]
Further, the width W of the fixing member for chemically strengthened glass is d ≦ W ≦ 10d.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
When fixing the cut chemically strengthened glass, it is useful to position the glass end outside the fixing member. In the case of cut chemically strengthened glass, the strength in the vicinity of the cut end may be lower than the strength of untreated glass, and sometimes lower than the strength of general untreated glass. Therefore, it is important to minimize the load on the end of the glass.
[0018]
As shown in FIG. 1, assuming that the thickness of the chemically strengthened glass 1 is d, the distance L between the glass end 3 and the end of the fixing member 2 and the width W of the fixing member 2 are preferably limited. Results can be obtained.
[0019]
That is, the distance L between the glass end 3 and the fixing member 2 is fixed such that d ≦ L ≦ 20d. If the distance L between the glass end and the fixing member is smaller than the plate thickness d, the cut end has a large effect, leading to breakage. Desirably, it is 3d or more. On the other hand, if it is larger than 20d, deformation near the edge based on the deformation of the central portion of the glass occurs, so that the glass is easily broken. Desirably, it is 15d or less.
[0020]
Further, the width W of the fixing member is also very important. The width W of the fixing member should be d ≦ W ≦ 10d between the thickness of the chemically strengthened glass and d. If the width W of the fixing member is smaller than the plate thickness d, it becomes a local load when a large load is applied, which leads to destruction. On the other hand, if the width W of the fixing member is larger than the plate thickness 10d, uniform fixing becomes difficult, leading to destruction. Preferably, 3d ≦ W ≦ 7d.
[0021]
As a material of the fixing member, wood, metal, or a composite material may be used in addition to polyethylene, vinyl chloride, rubber, and the like. A material having a greater modulus of longitudinal elasticity than glass may be used. However, when a rigid material or a material having high hardness is used, it is better to insert a mechanical buffer between the material and the glass. The thickness of the fixing member in contact with the glass is desirably 1 mm or more and 8 mm or less.
[0022]
The thickness of the compressive stress layer and the value of the compressive stress of the chemically strengthened glass are affected by the processing temperature and the processing time during the chemical strengthening, as well as the selection of the processing solution and its activation characteristics. Further, it differs depending on the ion exchange state and the crystallization state in the glass. Generally, the higher the processing temperature and the longer the processing time, the thicker the compressive stress layer. However, this operation sometimes works in the direction of reducing the value of the compressive stress.
[0023]
As described above, since the conditions of the chemical strengthening treatment and the physical properties of the chemically strengthened glass are complicatedly intertwined, it is not easy to produce a chemically strengthened glass having predetermined physical properties. However, even the chemically strengthened glass having a small compressive stress or the chemically strengthened glass having a thin compressive stress layer can be prevented from being broken by using the holding method of the present invention.
[0024]
【Example】
Hereinafter, description will be given based on examples.
[0025]
(Example 1)
A 0.7 mm thick, 100 mm square soda-lime-based float glass is chemically strengthened with 490 ° C. potassium nitrate molten salt for 1.5 hours. The thickness of the compressive stress layer formed on the glass surface is about 15 μm. A chemically strengthened glass having a stress value of 50 kgf / mm ² was obtained.
[0026]
This chemically strengthened glass was fixed on the condition that the distance L between the glass end and the fixing member end was 7 mm, the width W of the fixing member was 3.5 mm, and the glass was dropped on a concrete surface from a height of 3 m. A destructive test was performed. As a result, it was confirmed that no destruction occurred.
[0027]
(Example 2)
A soda-lime-based float glass having a thickness of 0.55 mm is chemically strengthened in a molten salt of potassium nitrate. A compressive stress layer formed on the glass surface has a thickness of about 20 μm, a compressive stress value of 40 kgf / mm ² , and a hardness of 600 kgf. / Mm ² was obtained.
[0028]
The chemically strengthened glass was fixed on the condition that the distance L between the glass end and the fixing member end was 7 mm, the width W of the fixing member was 2.5 mm, and was dropped on a concrete surface from a height of 2 m. A destructive test was performed. As a result, it was confirmed that no destruction occurred.
[0029]
(Example 3)
A soda-lime float glass having a thickness of 1.1 mm is chemically strengthened in a molten salt of potassium nitrate so that a compressive stress layer formed on the glass surface has a thickness of about 25 μm, a compressive stress value of 55 kgf / mm ² and a hardness of 600 kgf. / Mm ² was obtained.
[0030]
This chemically strengthened glass was fixed on the condition that the distance L between the glass end and the fixing member end was 7 mm, the width W of the fixing member was 3.5 mm, and the glass was dropped on a concrete surface from a height of 3 m. A destructive test was performed. As a result, it was confirmed that no destruction occurred.
[0031]
(Comparative Example 1)
A 0.7 mm thick, 100 mm square soda-lime-based float glass is chemically strengthened with 490 ° C. potassium nitrate molten salt for 1.5 hours. The thickness of the compressive stress layer formed on the glass surface is about 15 μm. A chemically strengthened glass having a stress value of 50 kgf / mm ² was obtained.
[0032]
This chemically strengthened glass was fixed under the conditions that the distance L between the glass end and the end of the fixing member was 0 mm and the width W of the fixing member was 10 mm. Was done. As a result, it was confirmed that cracks occurred at the end of the glass.
[0033]
(Comparative Example 2)
A soda-lime-based float glass having a thickness of 0.55 mm is chemically strengthened in a molten salt of potassium nitrate. A compressive stress layer formed on the glass surface has a thickness of about 20 μm, a compressive stress value of 40 kgf / mm ² , and a hardness of 600 kgf. / Mm ² was obtained.
[0034]
This chemically strengthened glass was fixed on the condition that the distance L between the glass end and the fixing member end was 13 mm, the width W of the fixing member was 5.5 mm, and the glass was dropped on a concrete surface from a height of 2 m. A destructive test was performed. As a result, the glass broke.
[0035]
(Comparative Example 3)
A soda-lime float glass having a thickness of 1.1 mm is chemically strengthened in a molten salt of potassium nitrate so that a compressive stress layer formed on the glass surface has a thickness of about 25 μm, a compressive stress value of 55 kgf / mm ² and a hardness of 600 kgf. / Mm ² was obtained.
[0036]
The chemically strengthened glass is fixed on the condition that the distance L between the glass end and the end of the fixing member is 0.5 mm, the width W of the fixing member is 0.5 mm, and the glass is dropped on a concrete surface from a height of 3 m. A destructive test was performed. As a result, it was confirmed that cracks occurred at the end of the glass.
[0037]
As shown from the above results, when the chemically strengthened glass having the thickness d is fixed, the glass end is located outside the fixing member, and the distance L between the glass end and the fixing member end is d. When ≦ L ≦ 20d and the width W of the fixing member for chemically strengthened glass is d ≦ W ≦ 10d, breakage can be prevented.
[0038]
The value of the surface compressive stress and the layer thickness were measured using a surface stress meter manufactured by Toshiba disclosed in Japanese Patent Publication No. 59-37451, and the hardness was measured using a Vickers hardness meter.
[0039]
【The invention's effect】
It has become possible to prevent the destruction of cut chemically strengthened glass, which has been considered difficult so far.
[Brief description of the drawings]
FIG. 1 is an example showing fixing of chemically strengthened glass.
[Explanation of symbols]
1 Chemically strengthened glass 2 Fixing member 3 Glass end (cut surface)
W Width of fixing member L Distance between glass end and fixing member end d Thickness of glass

Claims (3)

A chemically strengthened glass product wherein, when fixing the cut chemically strengthened glass, the glass end is located outside the fixing member. The chemically strengthened glass product according to claim 1, wherein when the thickness of the chemically strengthened glass is d, a distance L between an end of the glass and an end of the fixing member is fixed such that d ≦ L ≦ 20d. . 3. The chemically strengthened glass product according to claim 1, wherein a width W of the fixing member of the chemically strengthened glass is d ≦ W ≦ 10d.

Images