JP2004149364A - Chemically reinforced glass product and fixing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chemically reinforced glass product usable without being destroyed even after a cut chemically reinforced glass is put into a panel and especially effective against the destruction from a glass corner part, and to provide a fixing method therefor. <P>SOLUTION: The chemically reinforced glass product has the corner part cut into a circular shape or an elliptical shape and the periphery of the corner part is fixed by an L-shaped fixing member and is a soda lime chemically reinforced glass product having a plate thickness of (d) and the corner part is cut so that its radius may be ≥d and ≤15d. In the fixing method for the chemically reinforced glass, a length L of the L-shaped fixing member is set in ≥5d and ≤90d and a length fixed by the L-shaped fixing member is set in ≥3d and ≤80d. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
INDUSTRIAL APPLICABILITY The present invention is useful when a chemically strengthened glass, particularly a cut chemically strengthened glass is fixedly used, and the chemically strengthened glass is used in the field of electronic materials used for touch panels and the like, and for automobiles and buildings. 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. In particular, there is a problem that destruction due to impact is likely to occur at the corner of glass.
[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]
Such chemically strengthened glass is rarely used alone, and is mostly fixed to various objects. However, an appropriate fixing method has not been developed.
[0008]
In view of 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 Literature 1) are placed in an immersion holder during the production of the chemically strengthened glass. A holding method for inclining a glass plate by 0 to 15 degrees (for example, see Patent Document 2) and a method for reliably carrying out a glass substrate from a transport cassette called a pass box (for example, see Patent Document 3) are disclosed. ing.
[0009]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2002-160932
[Patent Document 2]
JP-A-62-241845
[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, but many breakage problems have occurred even after it has been manufactured.
[0013]
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. In particular, there is a tendency for breakage from corners of the glass to occur frequently. One reason for this is that no suitable method for fixing the corners of chemically strengthened glass has been found. As described above, with regard to the cut chemically strengthened glass, a technique for preventing impact destruction, including an effective fixing method, has not been established.
[0014]
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. Further, the method disclosed in Japanese Patent Application Laid-Open No. 62-241845 is a method for reducing the warpage of the float glass, and is not a technique directly leading to improvement in the strength of the 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.
[0015]
[Means for Solving the Problems]
According to the chemically strengthened glass and the fixing method of the present invention, the cut chemically strengthened glass can be used without being broken even after being incorporated into the panel. In particular, it is effective for the problem of breaking from the corner of the glass. The present invention relates to a soda lime-based chemically strengthened glass product having a corner portion cut in a circular shape or an elliptical shape and having a corner portion fixed by an L-shaped fixing member.
[0016]
Further, in a soda lime-based chemically strengthened glass having a thickness d, a chemically strengthened glass product in which a corner portion of the chemically strengthened glass is cut so as to have a radius of d to 15d is also effective. Further, a method of fixing chemically strengthened glass in which the length L of the L-shaped fixing member is 5d or more and 90d or less, and furthermore, chemically strengthened glass in which the length fixed by the L-shaped fixing member is 3d or more and 80d or less. By using the fixing method described above, destruction from a corner can be prevented.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
In the case of cut chemically strengthened glass, the strength near the glass edge may be lower than the strength of untreated glass, and sometimes lower than the strength of general untreated glass. In particular, corners are often exposed to mechanical shock, and thus often serve as a starting point of destruction. Therefore, chemically strengthened glass in which the load on the corner portion of the glass is minimized, that is, chemically strengthened glass having a corner portion cut in a circular or elliptical shape and the periphery of the corner portion fixed by an L-shaped fixing member is useful. It becomes.
[0018]
As shown in FIG. 1, it is preferable to use chemically strengthened glass in which a corner of the chemically strengthened glass 1 having a thickness d is cut so as to have a radius of d or more and 15 d or less. Here, 2 is an L-shaped fixing member, 3 is a shape before cutting, and 4 is a shape after cutting. L is the length of the L-shaped fixing member, W is the cut width of the glass corner, and R is the radius of curvature of the cut. The subscripts 1 and 2 are added to L and W, but this is for the sake of easy understanding of the direction, and the subscripts have no significant meaning.
[0019]
If the radius is smaller than d, the effect of corner cutting becomes extremely small, and the corner breaks. On the other hand, if the radius is larger than 15d, breakage from a portion off the corner end increases, and as a result, breakage increases.
[0020]
A method for fixing chemically strengthened glass in which the length L of the L-shaped fixing member is 5d or more and 90d or less is also effective. If the length L of the L-shaped fixing member is shorter than 5d, the corner portion is not sufficiently protected, and if the length L of the L-shaped fixing member is longer than 90d, the load escapes by deformation of the glass. Is more difficult, resulting in more destruction.
[0021]
Furthermore, it is also important to adopt a method of fixing chemically strengthened glass having a length fixed by the L-shaped fixing member of 3d or more and 80d or less. By limiting the length to be fixed, breakage from a corner can be prevented. When the length fixed by the L-shaped fixing member is smaller than 3d, the protection effect of the L-shaped fixing member is reduced. On the other hand, if the length fixed by the L-shaped fixing member is larger than 80d, breakage occurs from the center of the side, and the resulting glass breakage increases.
[0022]
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. Further, the modulus of longitudinal elasticity E is preferably 0.1 kPa or more and 7 × 10 ⁴ MPa or less. If the modulus of longitudinal elasticity E of the fixing member is smaller than 0.1 kPa, the load applied to the glass edge when an external load is applied increases. On the other hand, when the modulus of longitudinal elasticity E of the fixing member is larger than 7 × 10 ⁴ MPa, the escape due to deformation of the glass is reduced, and as a result, the glass is easily broken. Desirably, it is 0.5 kPa or more and 5 × 10 ⁴ MPa or less. The L-shaped fixing member does not need to be a single member, and may be appropriately divided.
[0023]
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.
[0024]
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 chemically strengthened glass having a small compressive stress or a chemically strengthened glass having a thin compressive stress layer can be prevented from being broken by the chemically strengthened glass product of the present invention and / or the fixing method of the present invention. it can.
[0025]
【Example】
Hereinafter, description will be given based on examples.
[0026]
(Example 1)
Soda-lime float glass with a thickness of 0.7 mm and a square of 50 mm is chemically strengthened with a molten salt of potassium nitrate at 490 ° C. for 1.5 hours, and 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.
[0027]
A corner of the chemically strengthened glass was cut so as to have a radius of 2 mm and placed in a plastic container. At this time, as shown in FIG. 2, an L-shaped fixing member 2 having a length of 10 mm and a fixing length of 8 mm was used as an intermediate fixing material with the chemically strengthened glass 1. After solidifying the outside of the intermediate fixing member and the inside of the plastic container with an adhesive, the plastic was dropped on a concrete surface from a height of 3 m to perform a destructive test. As a result, it was confirmed that no destruction occurred.
[0028]
(Example 2)
A soda-lime-based float glass having a thickness of 0.55 mm and a size of 120 mm square is chemically strengthened in a molten salt of potassium nitrate, and a compressive stress layer formed on the glass surface has a thickness of about 20 μm and a compressive stress value of 40 kgf / mm ² . A chemically strengthened glass was obtained.
[0029]
A corner of the chemically strengthened glass was cut so as to have a radius of 2 mm and placed in a plastic container. At this time, an L-shaped fixing member having a length of 10 mm and a fixing length of 8 mm was used as an intermediate fixing material, and the outside of the intermediate fixing material and the inside of the plastic container were fixed with an adhesive. This plastic was dropped on a concrete surface from a height of 2 m to perform a destructive test. As a result, it was confirmed that no destruction occurred.
[0030]
(Example 3)
A soda-lime-based float glass having a thickness of 1.1 mm and a square of 100 mm is chemically strengthened in a molten salt of potassium nitrate, and a compressive stress layer formed on the glass surface has a thickness of about 25 μm and a compressive stress value of 55 kgf / mm ² . A chemically strengthened glass was obtained.
[0031]
A corner portion of the chemically strengthened glass was cut so as to have a radius of 5 mm and placed in a plastic container. At this time, an L-shaped fixing member having a length of 15 mm and a fixing length of 10 mm was used as an intermediate fixing material, and the outside of the intermediate fixing material and the inside of the plastic container were fixed with an adhesive. This plastic was dropped on a concrete surface from a height of 3 m to perform a destructive test. As a result, it was confirmed that no destruction occurred.
[0032]
(Comparative Example 1)
Soda-lime float glass with a thickness of 0.7 mm and a square of 50 mm is chemically strengthened with a molten salt of potassium nitrate at 490 ° C. for 1.5 hours, and 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.
[0033]
This chemically strengthened glass was placed in a plastic container without corner cutting. At this time, an L-shaped fixing member having a length of 10 mm and a fixing length of 10 mm was used as an intermediate fixing material, and the outside of the intermediate fixing material and the inside of the plastic container were fixed with an adhesive. This plastic was dropped on a concrete surface from a height of 3 m to perform a destructive test. As a result, it was confirmed that it was broken from the corner.
[0034]
(Comparative Example 2)
A soda-lime-based float glass having a thickness of 0.55 mm and a size of 120 mm square is chemically strengthened in a molten salt of potassium nitrate, and a compressive stress layer formed on the glass surface has a thickness of about 20 μm and a compressive stress value of 40 kgf / mm ² . A chemically strengthened glass was obtained.
[0035]
A corner of the chemically strengthened glass was cut so as to have a radius of 2 mm and placed in a plastic container. At this time, an L-shaped fixing member having a length of 50 mm and a fixing length of 48 mm was used as an intermediate fixing material, and the outside of the intermediate fixing material and the inside of the plastic container were fixed with an adhesive. This plastic was dropped on a concrete surface from a height of 3 m to perform a destructive test. As a result, it was confirmed that it was broken from the center of the side.
[0036]
(Comparative Example 3)
A soda-lime-based float glass having a thickness of 1.1 mm and a square of 100 mm is chemically strengthened in a molten salt of potassium nitrate, and a compressive stress layer formed on the glass surface has a thickness of about 25 μm and a compressive stress value of 55 kgf / mm ² . A chemically strengthened glass was obtained.
[0037]
A corner portion of the chemically strengthened glass was cut so as to have a radius of 1 mm and placed in a plastic container. At this time, an L-shaped fixing member having a length of 15 mm and a fixing length of 14 mm was used as an intermediate fixing material, and the outside of the intermediate fixing material and the inside of the plastic container were fixed with an adhesive. This plastic was dropped on a concrete surface from a height of 3 m to perform a destructive test. As a result, cracks occurred in the corners of the glass.
[0038]
As shown from the above results, when fixing the cut chemically strengthened glass, by using the chemically strengthened glass and the fixing method of the present invention, glass breakage that has occurred frequently up to now, particularly breakage from the glass corner. Could be prevented.
[0039]
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.
[0040]
【The invention's effect】
It has become possible to prevent breakage of cut chemically strengthened glass, which has been regarded as difficult so far, particularly impact breakage from corners.
[Brief description of the drawings]
FIG. 1 is an example showing a corner portion and an L-shaped fixing member of the chemically strengthened glass of the present invention.
FIG. 2 is an example of fixing chemically strengthened glass using the L-shaped fixing member shown in the first embodiment.
[Explanation of symbols]
Reference Signs List 1 chemically strengthened glass 2 L-shaped fixing member 3 glass corner portion before corner cut 4 glass corner portion after corner cut d glass thickness L length of L-shaped fixing member W corner cut width R radius of curvature of corner cut

Claims (4)

A chemically strengthened soda-lime glass product characterized in that it has a corner portion cut in a circular or elliptical shape and the periphery of the corner portion is fixed by an L-shaped fixing member. The chemically strengthened glass product according to claim 1, wherein a cut width W of a glass corner is d or more and 15d or less in a soda lime-based chemically strengthened glass having a thickness d. 3. The method of fixing chemically strengthened glass according to claim 1, wherein the length L of the L-shaped fixing member is set to 5d or more and 90d or less when fixing the chemically strengthened glass according to claim 1 with an L-shaped fixing member. . The fixing of the chemically strengthened glass according to claim 1 or 2, wherein the length fixed by the L-shaped fixing member is 3d or more and 80d or less. Method.

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