JP2004262686A - Method for cutting glass plate and cut glass plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a method for cutting a glass plate wherein the glass plate whose surface has been treated for forming a thin film or a pattern is immediately cut without drying a surface-treatment agent to achieve shorter production time, fewer steps and great cost reduction, and to obtain a glass product whose cost is greatly reduced by using the glass plate cut through the same. <P>SOLUTION: In the method for cutting the glass plate, the glass plate having the thin film or the pattern is placed flat and cut using a laser beam from the bottom surface of the glass contacting a roller or a support fitting. The method requires no step for drying the thin film or the pattern prior to cutting. The cut glass plate is cut through this method. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for cutting a glass plate having a thin film surface or a patterned surface, and a cut glass plate.
[0002]
[Prior art]
From the viewpoint of saving resources and energy, the fuel efficiency of automobiles is regarded as important, and measures to reduce the fuel efficiency of automobiles are being studied. For this reason, the glass etc. which made the shape of the automobile into a streamline type, reduced the accessory to the exterior of a vehicle body, or made the level | step difference small, and improved the air flow characteristic are considered. For this reason, the shape of the window glass for motor vehicles is complicated.
[0003]
On the other hand, in addition to saving resources and energy, tempered glass and laminated glass that have undergone surface treatment are increasingly used due to changes in social needs for ensuring safety. For example, a glass that reflects or absorbs infrared or far-infrared rays called heat rays with a reflection film or absorption film on the surface, anti-glare with a reduced transmittance of sunlight, or a black object pasted around the glass Products such as glass, with resources and energy savings and safety in mind, are steadily increasing. As described above, the shape of the window glass for automobiles is complicated, and the demand for high precision is increasing. However, it is not easy to manufacture glass with the surface treated with high accuracy and at low cost.
[0004]
In particular, cutting of surface-treated glass tends to be difficult. That is, it is extremely difficult to cut the surface-treated glass with high accuracy without cutting down the characteristics of the surface treatment and at low cost. When cutting glass that requires surface treatment, it is generally a step of 1) glass surface treatment 2) glass drying treatment 3) glass cutting 4) tempering treatment or laminating treatment. Glass surface treatment can be roughly divided into a thin film case and a pattern case. In any case, since the liquid substance is included in some form, it is necessary to dry the liquid substance to eliminate the moisture in the liquid substance, and it is common to cut after the influence of the moisture in the liquid substance has been eliminated. It is.
[0005]
This is because when glass is cut, the influence of moisture is known empirically or theoretically, and if moisture is present in the surface treatment agent, cutting becomes extremely difficult. Thus, it is not easy to cut the surface-treated glass, and the manufacturing process is complicated. The surface treatment is performed on the upper surface of the glass in a flat state. This is because when the surface treatment is made on the lower surface, the surface treatment agent comes into contact with the support member and the transport member, and thus a problem occurs in the surface treated portion. Further, since the problem of sagging of the surface treatment agent generally occurs when it is placed vertically, the product is not placed vertically. The above is particularly remarkable when a thin film is formed on glass.
[0006]
In addition, for example, glass with a pattern on the surface has been commercialized in order to improve design properties as a glass product or to improve optical characteristics. It is also very difficult to cut glass with such a pattern. In order to reduce the possibility of scratches and breakage as much as possible, glass with a pattern is generally provided with the pattern side as the upper surface during transport. For this reason, in the conventional glass cutting method which presses and cuts a glass cutter from the upper part, it is not possible to cut the glass as it is, and it is necessary to cut the pattern surface on the lower side in a process that is almost final. Thus, it is not easy to cut glass with a pattern, and the manufacturing process is complicated. In addition, since the cutting process is performed in a process close to the final stage, if the cutting fails, there is a problem that the cost is significantly increased. Pattern formation is also a kind of surface treatment, and in many cases, a liquid material is used on the glass of the pattern surface.
[0007]
If a publicly known technique is seen, the manufacturing method of the window glass for motor vehicles which has the decoration coating | cover of an area dimension larger than a final area dimension is disclosed (for example, refer patent document 1).
[0008]
Furthermore, if a known technique is seen, for example, a glass cutting method and a cutting apparatus using a laser having a higher-order power distribution than the TEM00 mode (for example, Patent Document 2), bending and / or prestressing is applied. Laser cutting (see, for example, Patent Document 3) is described in the glass member manufacturing method.
[0009]
Further, there is a description relating to glass cutting in a glass cutting device (for example, see Patent Document 4) using a carbon dioxide gas laser having a reflecting mirror unit or other optical system unit and its control means.
[0010]
[Patent Document 1]
JP-A-5-70164 [Patent Document 2]
Japanese Patent Application Laid-Open No. 9-12327 [Patent Document 3]
JP 2001-226130 A [Patent Document 4]
Japanese Patent Laid-Open No. 2002-45984
[Problems to be solved by the invention]
It is not easy to cut a glass having a thin film or a pattern, and the glass cannot be cut unless the influence of moisture in the surface treatment liquid for forming the thin film or the pattern is removed. This has been a cause of increased complexity and a significant increase in manufacturing costs due to the diversified processes in manufacturing tempered glass and laminated glass.
[0012]
In addition, the method disclosed in Japanese Patent Laid-Open No. 5-70164 increases the yield at the time of cutting an automotive window glass having a decorative coating, but the effect of shortening the time is not significant. In the methods and apparatuses disclosed in JP-A-9-12327, JP-A-2001-226130, and JP-A-2002-45984, it is stated that a laser is used. The fact that it must be cut as a side is hardly different from the conventional one.
[0013]
[Means for Solving the Problems]
The present invention relates to a method for cutting a glass plate having a thin film or a pattern under a flat state by using a laser from the lower surface side of the glass that is in contact with a roller or a supporting bracket. is there. It is a method for cutting a glass plate that does not require a thin film drying step performed before cutting and does not require a drying step after pattern formation processing performed before cutting. Furthermore, it is the glass plate cut | disconnected by said method.
[0014]
In the method of cutting a glass plate having a thin film or a pattern under a flat state, it is essential to cut from the lower surface side of the glass that is in contact with a roller or a supporting metal fitting. In the conventional method of cutting a glass plate from the upper surface of glass, it is not possible to immediately cut a glass plate that has been subjected to surface treatment such as a thin film or a pattern. This is because the water in the surface treatment liquid becomes an inhibitor of glass cutting as described above. By cutting from the lower surface side of the glass that is in contact with the roller or the supporting metal fitting, the influence of moisture present in the surface treatment agent such as a thin film or a pattern can be eliminated. Further, even a glass plate on which a pattern is formed and light scattering is likely to occur can be cut with high accuracy.
[0015]
It is also important to use a laser as the cutting tool. Cutting tools other than lasers cannot cut around the edge of the glass.
[0016]
According to the glass cutting method of the present invention, the surface-treated glass such as a thin film or a pattern can be cut as it is, and the drying process of the surface treatment can be omitted, leading to a reduction in production time and process, Significant cost reduction is possible. In addition, since the number of steps can be reduced, it is possible to obtain a glass product with a significant cost reduction. Furthermore, it is a glass plate in which the necessity of performing end face treatment of tempered glass or laminated glass is drastically reduced or eliminated.
[0017]
【Example】
Hereinafter, description will be made based on examples.
(Example 1)
As shown in FIGS. 1 and 2, a rectangular glass 1 having a thickness of 1200 mm × 1000 mm and a thickness of 3 mm was prepared, and a black paste 2 was printed on a predetermined portion thereof. The width of the black paste is about 100 mm and the thickness is about 10 μm. Thereafter, the printed surface of the black paste 2 was placed on the supporting metal fitting 3 with the printing surface of the black paste 2 facing upward without drying.
[0018]
Next, glass was cut by irradiating CO ₂ laser light 4 from the opposite surface of the portion where the black paste 2 was printed at a laser output of 25 W and a scanning speed of 4 m / min. The position of the glass cutting line is 2 mm from the outer periphery of the black framed portion.
[0019]
As a result, no particular problem occurred, and a good cut surface equivalent to normal laser cutting was obtained. By using the glass also as a tempering treatment, a highly accurate tempered glass with a cut surface was obtained without passing through a conventional drying process. In addition, about this glass, the special end surface process was not performed. When the glass thus obtained was tested in accordance with the automotive glass standard JIS R3211, it passed all items.
[0020]
(Example 2)
As shown in FIG. 3, the glass plate 1 etched on the surface of one side was placed on the support bracket 3 in a horizontal state with the etching processing surface 2 </ b> E on the upper side.
Next, the glass was cut by irradiating the CO ₂ laser beam 4 with a laser output of 25 W and a scanning speed of 4 m / min from the glass surface opposite to the etched surface. The glass dimensions and the like are the same as in Example 1.
[0021]
As a result, no particular problem occurred, and a good cut surface equivalent to normal laser cutting was obtained. When the glass thus obtained was tested in accordance with the automotive glass standard JIS R3211, it passed all items.
[0022]
(Example 3)
A silica film was formed on one side of the glass similar to Example 1 using the sol-gel method. The film forming method was a spin coating method, and a film of about 0.5 μm was obtained. The glass after the film formation was placed on the support metal fitting with the film formation surface facing up without passing through the drying step.
[0023]
Next, the glass was cut by irradiating CO ₂ laser light 4 from the glass surface opposite to the film formation at a laser output of 25 W and a scanning speed of 4 m / min. As a result, no particular problem occurred, and a good cut surface equivalent to normal laser cutting was obtained.
[0024]
By firing the glass, an accurate glass with a cut surface was obtained without passing through the conventional drying process. When the glass thus obtained was tested in accordance with the automotive glass standard JIS R3211, it passed all items.
[0025]
(Comparative Example 1)
The sample shown in Example 1 was manufactured in substantially the same manner as in Example 1. However, here, laser cutting was attempted from the upper surface of the glass plate.
As a result, cutting was possible, but the cutting accuracy was poor, and there was a part where the cut surface ran diagonally, and it was confirmed that it was not at the product level by appearance inspection.
[0026]
(Comparative Example 2)
The sample shown in Example 2 was manufactured in substantially the same manner as in Example 2. However, here, laser cutting was attempted from the upper surface of the glass plate.
[0027]
As a result, although cutting was possible, the unevenness | corrugation of a cut surface was remarkable, the cutting precision was bad, and there existed a part which the cut surface ran diagonally.
[0028]
(Comparative Example 3)
The sample shown in Example 1 was manufactured in substantially the same manner as in Example 1. However, here, the cutting was performed from the upper surface of the glass plate with a conventional cutting method using no laser, that is, a wheel glass cutter made of cemented carbide.
As a result, the cutting accuracy was very poor, and there was a portion where the cut surface ran diagonally. In this cut state, it was clearly a level that could not be made into a glass product.
[0029]
As shown from the above results, according to the method for cutting a glass plate of the present invention, the surface-treated glass for forming a thin film or a pattern can be cut as it is, and the drying step of the surface treatment agent is omitted. As a result, production time and processes were reduced, and significant cost reductions became possible. Moreover, according to the cut | disconnected glass plate of this invention, the glass product by which significant cost reduction was carried out was able to be obtained.
[0030]
【The invention's effect】
According to the method for cutting a glass plate of the present invention, the glass surface-treated for forming a thin film or a pattern can be cut as it is, and the drying step of the surface treatment agent can be omitted. This leads to a decrease in cost and enables significant cost reduction. Moreover, according to the cut | disconnected glass plate of this invention, the glass product by which significant cost reduction was carried out can be obtained.
[Brief description of the drawings]
FIG. 1 is a schematic view showing glass cutting in Example 1 of the present invention.
FIG. 2 is a side view showing glass cutting in Example 1 of the present invention.
FIG. 3 is a schematic view showing cutting of a glass plate having a surface pattern according to the present invention.
[Explanation of symbols]
1 Glass plate 2 Surface treatment (black frame treatment)
2E Surface treatment (etching)
3 Glass support (lower part)
4 Laser 5 Cutting line 2 Surface treatment (etching)

Claims (4)

In a method of cutting a glass plate having a thin film or a pattern under a flat state, the method of cutting using a laser from the lower surface side of the glass in contact with a roller or a supporting metal fitting, . 2. The method for cutting a glass plate according to claim 1, wherein a drying step of the thin film is not required before cutting. The method for cutting a glass plate according to claim 1 or 2, wherein a drying step after the pattern forming treatment performed before cutting is not required. The cut | disconnected glass plate cut | disconnected by the method in any one of Claims 1 thru | or 3.

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