JPH09210294A - Supporting method for thin glass pane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To support a thin glass pane at a position where deflection and applied stress are reduced simultaneously to the minimum by supporting it by four points approximately on the diagonal line of a rectangle located between the center and a position apart by a specified distance from the center in a distance between the center and the top points of the rectangle. SOLUTION: A rectangular thin glass pane 11 is adopted. First the thin glass pane 11 is divided virtually into four quadrants by parting lines 9 and 10, and supported by a supporting point 8 in each quadrant. In four point supporting, when a distance between the center and the top point of a rectangle approximately on a diagonal line of the rectangle is set at a specified value of 100, the thin glass pane is supported by four points located between the center and a point apart by a specified distance from the center (50 to 60). Thus, even a very thin glass pane can be supported on no more points than four points.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for supporting a relatively thin glass for a large size, such as a glass substrate used in a liquid crystal display device, a plasma display device or the like.

[0002]

2. Description of the Related Art Liquid crystal display devices and plasma display devices have become larger and larger in recent years, and it has become necessary to handle larger and larger glass substrates in the process. On the other hand, in order to meet the demand for reducing the weight of devices, thinner glass plates than ever have been used. For example, for substrate glass for liquid crystal display devices, large substrates exceeding 300 mm × 400 mm have come to be used, while the thickness is 0.
The thickness is reduced from 9 mm to about 0.7 mm, making it extremely thin.

There are various supporting methods for handling such a large and thin glass plate in the process. Among them, the so-called point supporting method is most often used.

The point support method is a method in which the back surface of the glass plate is horizontally supported in point contact at several (for example, 4 to 5) support points, and has several advantages. For example,
Since the contact area is small, there is little concern about scratches and dirt from the contact point, and the supporting side is also exposed to almost the surrounding atmosphere, so it can be used in equipment that treats by the surrounding atmosphere and radiation. It will be.
The point support method can also be suitably used in a heating furnace that heats at an ambient temperature.

[0005]

However, when a large and thin glass plate is supported by a point support, the rigidity as a whole is lowered and the deflection is remarkable. There is also the problem of cracking.

Therefore, it is very difficult to support a large and thin glass plate by supporting points at several points, and the number of supporting points must be increased for supporting points. However, in this case, the merit of the above point support is not fully exerted.

[0007]

SUMMARY OF THE INVENTION The present invention is to solve the above problems and is a method for supporting a substantially rectangular thin glass plate, wherein the distance from the center to the apex of the rectangle is 100.
In the case of, the thin glass plate is supported at four points on a diagonal line of a rectangle between 50 and 60 from the center, and a method for supporting a thin glass plate and a substantially rectangular thin glass plate are provided. A method of supporting, in which, when the distance from the center to the apex of the rectangle is 100, the thin glass sheet is point-supported at four points on the substantially diagonal line of the rectangle located between 60 and 70 from the center and five points in total. A method for supporting a thin glass plate is provided.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION According to the research conducted by the present inventors, in the case of supporting with a relatively small number of points such as 4 points and 5 points, the amount of stress and flexure applied to a glass plate can be reduced by a slight difference in the supporting points. It was revealed that there is a large change, and there is a point where the deflection and the stress applied to the glass plate can be almost minimized at the same time. The present invention is based on such knowledge, and it is possible to support a very thin glass plate with a small number of points by supporting the glass plate at a specific position that minimizes the bending and the applied stress almost at the same time. .

As the thin glass plate in the present invention, a substantially rectangular plate is adopted. As a result, it is possible to support at point-symmetrical positions, and stable support can be performed with a small number of support points.

Further, the effect of the present invention is large, specifically, when the length a of the long side of the rectangle and the thickness d are a /
A glass plate having d of 400 or more, particularly 650 or more. In the present invention, such a glass plate having low rigidity can be supported with a small number of supporting points.

Next, the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory diagram for explaining the present invention.
Reference numeral 11 shows the thin glass plate to be supported viewed from above. Virtually divide the thin glass plate 11 by dividing lines 9 and 10.
Divide into one quadrant. And 8 support points in each quadrant
Shall be supported by.

In the present invention, in the case of four-point support, the distance from the center to the apex of the rectangle is 100 on the substantially diagonal line of the rectangle.
In the case of, the support is performed at four points between 50 and 60 from the center, and in the case of five-point support, from the center when the distance from the center to the apex of the rectangle is 100 on the almost diagonal line of the rectangle. Support is provided at 4 points between 60 and 70 and a total of 5 points in the center.

First, 470 mm × 370 mm × 0.7 m
In the case of supporting the soda lime silicate glass of m at four points, an example of a case where the optimum supporting position is obtained will be described.

The mesh is divided into meshes as shown in 7 of FIG. 1, and the stress generated in each element is calculated by the finite element method analysis calculation.
The amount of deformation was calculated. As shown in FIG. 1, since the model is symmetrical with respect to the dividing lines 9 and 10, the analysis model is simplified to 1/4 for calculation. FIG. 2 is an enlarged view of the 1/4 quadrant (lower left) of them, and line 1 in the analysis model as shown in FIG.
For each case in which the support point was changed to the range from point 1 to point 4 of line 4 to line 4, the deformation amount of the glass substrate and the stress at each element point in the substrate were calculated. The maximum amount of deflection in each case is shown in FIG. 3, and the maximum stress is shown in FIG.

FIG. 3 is a diagram showing the maximum amount of deflection, but it can be seen that the amount of deflection changes several times even if the supporting point moves only for a distance of about 1/10 of the side length of the glass. Similarly, FIG. 4 shows changes in the maximum tensile stress in arbitrary units.

The optimum support area shown in FIG. 5 is derived from FIGS. 3 and 4. This is a point between 50 and 60 from the center when the distance from the center to the apex of the rectangle is 100 on the substantially diagonal line of the rectangle, and more preferably 55 to 60.
If it is a rectangular glass, it can be supported at almost the same position even if it is another glass, and it can be supported with less flexure and stress.

Similarly, in the case of supporting at five points, an example of obtaining where the optimum supporting position is will be shown.

Dividing into a mesh as shown in FIG. 1,
The generated stress and the amount of deformation in each element were obtained by the finite element method analytical calculation. As shown in FIG. 1, since the model is symmetric with respect to the dividing lines 9 and 10, the analysis model is simplified to 1/4 for calculation. FIG. 6 is an enlarged view of the 1/4 quadrant, and each case when the supporting point is changed from the point 1 to the point 5 of the line 0 to the line 4 in the analysis model as shown in FIG. For, the amount of deformation of the glass substrate and the stress at each element point in the substrate were calculated. The maximum amount of deflection and maximum stress in each case are shown in FIGS. 7 and 8. However, in this case, the center (point a in FIG. 6) is also included in the support points.

FIG. 7 is a diagram showing the maximum amount of deflection, but it can be seen that the amount of deflection changes several times even if the supporting point is moved for a distance of about 1/10 of the side length of the glass. Similarly, FIG. 8 shows changes in the maximum tensile stress in arbitrary units.

The optimum support area shown in FIG. 9 is derived from FIGS. 7 and 8. This is a point on the substantially diagonal line of the rectangle, which is 60 to 70, and more preferably 63 to 68 from the center when the distance from the center to the vertex of the rectangle is 100. However, if it is a rectangular glass, if it is supported at substantially the same position and at the center of the five points, it is possible to support both flexure and stress.

For a specific method of supporting the present invention.
Various methods can be adopted.

FIG. 10 shows an example of a manual jig / tool. However, only the position of the support point is adjusted precisely. 2 workers
The glass plate 11 is supported and conveyed by holding the handgrip of No. 1 and inserting the arm portion having the supporting point from the lower surface of the glass plate and applying the supporting point 23 having a predetermined friction to the fixed position on the lower surface of the glass plate 11. You can do it.

FIG. 11 shows a supporting method when heating with a hot plate. Reference numeral 24 is a hot plate, and 25 is a support pin, which penetrates the hot plate and moves up and down. The glass plate 11 is attached to the tip of the support pin 25.
Is supported, the support pins are gradually lowered, and finally almost the entire surface of the glass plate 11 is brought into contact with the surface of the hot plate 24 and heated. After heating, the support pin 25
Rise again to pull the glass plate 11 away from the surface of the hot plate 24.

According to the supporting method of the present invention, the stress generated by the point support is small and the glass plate is less likely to be cracked by the series of operations, and the deformation is small. Therefore, uniform heating by a hot plate is possible. become.

[0026]

According to the present invention, even a very thin glass plate can be point-supported with a small number of support points of 4-5 points.

Therefore, scratches and stains during transportation can be prevented as much as possible. Further, since there is little deflection at the time of supporting, there is an advantage that uniform heating becomes possible when this supporting method is used when mounting on a hot plate.

[Brief description of drawings]

FIG. 1 is an explanatory view illustrating a point support method for a glass plate of the present invention.

FIG. 2 is an explanatory diagram for obtaining an optimum support area in the case of four-point support.

FIG. 3 is a graph showing changes in the amount of deflection depending on the support position in the case of four-point support.

FIG. 4 is a graph showing changes in tensile stress depending on the support position in the case of four-point support.

FIG. 5 is an explanatory diagram showing an optimum support area in the case of four-point support.

FIG. 6 is an explanatory diagram for obtaining an optimum support area in the case of 5-point support.

FIG. 7 is a graph showing changes in the amount of deflection depending on the support position in the case of five-point support.

FIG. 8 is a graph showing changes in tensile stress depending on the supporting position in the case of supporting at five points.

FIG. 9 is an explanatory view showing an optimum support area in the case of supporting five points.

FIG. 10 is a view showing an example of a support tool to which the supporting method of the present invention is applied, (a) is a plan view, and 8b) is a side view.

FIG. 11 is a perspective view showing an example of a hot plate to which the supporting method of the present invention is applied.

[Explanation of symbols]

 7: Mesh 8: Support point 11: Glass plate 23: Support point 24: Hot plate 25: Support pin

Claims (2)

[Claims] 1. A method for supporting a thin glass plate having a substantially rectangular shape, wherein when the distance from the center to the apex of the rectangle is 100, the rectangle between the center and 50 to 60 is approximately on the diagonal line. A method for supporting a thin glass plate, which comprises supporting the thin glass plate at points. 2. A method for supporting a thin glass plate having a substantially rectangular shape, wherein when the distance from the center to the apex of the rectangle is 100, the rectangular shape between 60 and 70 from the center is approximately on the diagonal line 4. A method for supporting a thin glass plate, comprising supporting a thin glass plate at a total of 5 points, namely, a point and a center.