KR20150085811A - Glass transport roller, method for manufacturing float plate glass, and device for manufacturing float plate glass - Google Patents
Glass transport roller, method for manufacturing float plate glass, and device for manufacturing float plate glass Download PDFInfo
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- KR20150085811A KR20150085811A KR1020157011476A KR20157011476A KR20150085811A KR 20150085811 A KR20150085811 A KR 20150085811A KR 1020157011476 A KR1020157011476 A KR 1020157011476A KR 20157011476 A KR20157011476 A KR 20157011476A KR 20150085811 A KR20150085811 A KR 20150085811A
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- Prior art keywords
- glass
- conveying roller
- strip
- roller
- shaped film
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- 239000011521 glass Substances 0.000 title claims abstract description 336
- 238000004519 manufacturing process Methods 0.000 title claims description 36
- 239000005357 flat glass Substances 0.000 title claims description 17
- 238000000034 method Methods 0.000 title claims description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 37
- 239000005329 float glass Substances 0.000 claims description 23
- 239000002519 antifouling agent Substances 0.000 claims description 10
- 229910052783 alkali metal Inorganic materials 0.000 claims description 9
- 150000001340 alkali metals Chemical class 0.000 claims description 9
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 6
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 5
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 2
- 150000003841 chloride salts Chemical class 0.000 claims description 2
- 239000011224 oxide ceramic Substances 0.000 claims description 2
- 229910052574 oxide ceramic Inorganic materials 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 150000003568 thioethers Chemical class 0.000 claims 1
- 239000000243 solution Substances 0.000 description 28
- 238000007689 inspection Methods 0.000 description 11
- 238000005520 cutting process Methods 0.000 description 10
- 239000002904 solvent Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- 238000010583 slow cooling Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000003513 alkali Substances 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 239000011777 magnesium Substances 0.000 description 5
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000006060 molten glass Substances 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 2
- 235000019341 magnesium sulphate Nutrition 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000006124 Pilkington process Methods 0.000 description 1
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- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007496 glass forming Methods 0.000 description 1
- 238000005816 glass manufacturing process Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052976 metal sulfide Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
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- 150000004767 nitrides Chemical class 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- 238000005498 polishing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- -1 specifically Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B35/00—Transporting of glass products during their manufacture, e.g. hot glass lenses, prisms
- C03B35/14—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands
- C03B35/16—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by roller conveyors
- C03B35/18—Construction of the conveyor rollers ; Materials, coatings or coverings thereof
- C03B35/181—Materials, coatings, loose coverings or sleeves thereof
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B18/00—Shaping glass in contact with the surface of a liquid
- C03B18/02—Forming sheets
- C03B18/04—Changing or regulating the dimensions of the molten glass ribbon
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B25/00—Annealing glass products
- C03B25/04—Annealing glass products in a continuous way
- C03B25/06—Annealing glass products in a continuous way with horizontal displacement of the glass products
- C03B25/08—Annealing glass products in a continuous way with horizontal displacement of the glass products of glass sheets
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Abstract
There is provided a glass conveying roller in which a plurality of strip-shaped films are formed on a surface by supplying a solution containing an anti-scratch agent.
Description
The present invention relates to a glass conveying roller, a method of manufacturing a float glass, and an apparatus for manufacturing a float glass.
In the manufacturing method of the float process plate glass, the molten glass is continuously supplied to the horizontal bath surface of the bath containing the molten metal to form the glass ribbon. Subsequently, the glass ribbon is pulled up from the molten metal bath tank outlet, drawn out of the molten metal bath, and formed into a desired thickness.
The glass ribbon drawn out of the bath is gradually cooled while conveying the conveying rollers in the gradual cooling furnace in order to prevent breakage due to abrupt contraction or decrease in flatness. It is known that in the step of conveying the glass ribbon in the gradual cooling furnace, scratches may occur on the glass surface due to contact between the glass ribbon and the conveying roller.
For this reason, conventionally, sulfur dioxide (SO 2 ) is introduced into the annealing furnace and a glass component and SO 2 are reacted on the surface of the glass ribbon at a high temperature to form a buffer layer containing, for example, sodium sulfate or sodium sulfite on the glass surface Have been used. However, because of the necessity of forming a circuit of a liquid crystal display element on the surface of the plate glass for a liquid crystal display, an alkali-free glass containing almost no alkali metal which is considered to adversely affect the formation of a circuit is used. In the case of an alkali-free glass, since a buffer layer containing sodium sulfate or the like is hardly formed even when the SO 2 gas comes into contact with the alkali metal, the occurrence of scratches due to contact with the conveying roller can not be prevented .
In order to solve such a problem,
However, according to the buffer layer forming method described in
As a result, there has been a problem in that when the scratches on the glass surface are inspected in the inspection process, it is impossible to inspect the entire surface of the surface provided with such a thick buffer layer by the automatic inspection machine.
The present invention has been made in view of the above problems in the prior art, and it is an object of the present invention to provide a method of inspecting scratches on a surface of a glass in contact with a conveying roller by an automatic tester, while suppressing occurrence of scratches on the surface of the glass, And to provide a glass conveying roller capable of being carried out.
In order to solve the above problems, the present invention provides a glass conveying roller in which a plurality of strip-shaped films are formed on the surface by supplying a solution containing an anti-scratch agent.
According to the glass conveying roller of the present invention, since the contact portion between the glass and the glass conveying roller can be limited while preventing occurrence of scratches on the surface of the glass when used for conveying the glass, It is possible to inspect flaws on the glass surface.
1 is an explanatory diagram of a glass conveying roller according to a first embodiment of the present invention;
2 is an explanatory diagram of a method of forming a strip-shaped film on a glass conveying roller according to a first embodiment of the present invention;
3 is a top view of a glass-carrying state according to a second embodiment of the present invention.
4 is a schematic view of a glass manufacturing apparatus according to a third embodiment of the present invention.
Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments, and various modifications and substitutions may be made without departing from the scope of the present invention. .
[First Embodiment]
In this embodiment, a structural example of the glass conveying roller of the present invention will be described.
The glass conveying roller of this embodiment is formed by forming a plurality of strip-shaped films on the surface by supplying a solution containing an anti-scratch agent.
Hereinafter, the glass conveying roller of the present embodiment will be specifically described.
1 (A) and 1 (B), the structure of the glass conveying roller of the present embodiment will be described. Fig. 1 (A) schematically shows a perspective view of a glass conveying roller according to the present embodiment. Fig. 1 (B) is a sectional view of the glass conveying roller viewed from the direction of a block arrow A in Fig. Fig.
1 (A) and 1 (B), the
The
The strip-
The anti-fouling agent used when forming the strip-shaped film is preferably a material that does not cause scratches on the glass ribbon when the
A solution containing an anti-fouling agent means a solution in which an anti-fouling agent is dissolved or a solution in which an anti-fouling agent is dispersed. The solvent (dispersion liquid) constituting the solution is not particularly limited and may be any one capable of dissolving or dispersing an anti-scratch agent. However, even when the solvent remains on the strip-shaped film, it is preferable that the film is a glass which is being transported, and a material which does not affect the manufacturing process. Specifically, for example, water, alcohol such as ethanol and methanol can be preferably used. The water used herein may be any of tap water, distilled water, ion-exchanged water, and ultrapure water.
The mixing ratio of the solvent to the solute (scratch-preventive agent) when preparing the solution containing the scratch-preventive agent is not particularly limited, and may be a ratio of the viscosity to the extent that the solution can be supplied to the roller by the nozzle The two can be mixed. For example, when the mass of the solute is 1, the mass of the solvent is preferably 1 to 40, more preferably 3 to 20, and more preferably 5 to 10 Is particularly preferable.
A specific method for supplying the solution containing the scratch prevention agent to the
The timing of supplying the solution containing the scratch inhibitor to the
An example of a method of forming a strip-shaped film on a glass conveying roller will be described with reference to Fig. Fig. 2 is a cross-sectional view taken along the plane perpendicular to the rotation axis of the glass conveying roller. As shown in Fig. 2, the strip-
Further, the position of the nozzle is not limited to the shape shown in Fig. 2, and it can be provided at any place. Further, the
In the case where the
When a solution containing an anti-flaw agent is supplied to the roller while the glass conveying roller is installed in the glass manufacturing apparatus, the supply amount of the solution containing the anti-flaw agent is preferably from 0.1 g / min to 20 g / min or less. This is because, if it is less than 0.1 g / min, the speed at which the strip-shaped film is formed is slowed down. If it is more than 20 g / min, the solvent contained in the solution is volatilized, It is because. Particularly, the supply amount of the solution containing an anti-scratch agent is preferably 0.1 g / min or more and 10 g / min or less per one strip-shaped film, and particularly preferably 0.1 g / min or more and 5 g / min or less per strip-shaped film.
The size of the strip-shaped film is not particularly limited, but it is preferably 1 mm or more and 100 mm or less as the width (W in Fig. 1 (B)). If the thickness is less than 1 mm, there is a case that the glass which is supported and conveyed by the belt-shaped film can not be sufficiently supported, and there is a possibility that the glass and the conveying roller come into direct contact with each other and scratches on the glass surface. On the other hand, if it is larger than 100 mm, the area in contact with the glass becomes large, and when a part of the strip-shaped film adheres to the glass, there is a possibility that the range that can not be inspected is widened. In particular, the width of the band-shaped film is more preferably 5 mm or more and 50 mm or less, and particularly preferably 5 mm or more and 10 mm or less.
The size of the band-shaped film does not need to be uniform on the glass conveying roller. For example, in FIG. 1B, six band-shaped films denoted by 12a to 12f are formed. However, 12a to 12f May be the same or different. It is preferable that the width of each band-shaped film is in the above-mentioned range.
The interval between the strip-shaped films, that is, the length indicated by L in Fig. 1 (B) is not particularly limited and may be arbitrarily selected. It is preferable to select the interval of the strip-shaped films to such an extent that the glass is not in direct contact with the rollers desirable.
Further, for example, when the glass to be conveyed is cut by a cutting line along the conveying direction when it becomes the final product, the interval between the strip-shaped films is selected such that the position of the strip-shaped film coincides with or near the position of the cutting line Is more preferable.
The distance between the strip-shaped films is preferably 20 mm or more and 700 mm or less. This is because, if it is smaller than 20 mm, the portion where the glass and the strip-shaped film do not contact with each other is reduced, and the range in which the inspection of the scratches can be performed by the automatic inspection machine may be narrowed. On the other hand, if it is larger than 700 mm, the glass is deformed depending on the viscosity of the glass to be conveyed, and there is a fear that the glass and the roller come into direct contact with each other. The distance between the strip-shaped films is more preferably 50 mm or more and 500 mm or less, and particularly preferably 100 mm or more and 300 mm or less.
Also in this case, when two or more intervals of strip-shaped films are provided in the same roller, these intervals may be the same or may be different from each other. In either case, it is preferable that the interval between the strip-shaped films is in the above range.
The thickness of the belt-like film indicated by H in Fig. 1 (B) is not particularly limited, but it is preferable to select the thickness of the belt so that the glass and the roller are not in direct contact with each other. Specifically, for example, it is preferably 0.1 mm or more and 30 mm or less. This is because, when the thickness of the strip-shaped film is less than 0.1 mm, there is a high possibility that the glass and the roller directly come into direct contact with each other when the glass is transported. On the other hand, if it is larger than 30 mm, the distance between the surface of the roller and the surface of the band-shaped film becomes large, and the glass may be deformed to a degree that the glass can not be repaired depending on the viscosity of the glass to be transported. The thickness of the strip-shaped film is more preferably 1 mm or more and 20 mm or less, and particularly preferably 3 mm or more and 10 mm or less.
The strip-shaped film may contain different thicknesses in the same glass conveying roller. In order to maintain the flatness of the glass to be conveyed, however, the glass and the strip- Are preferably the same or substantially the same.
It is preferable that the thickness of the band-shaped film described herein is at least in the range of the film thickness at the stage before starting to transport the glass, and it is more preferable that the thickness of the band-shaped film is in the above range even during conveyance and after conveyance.
As described above, in the present embodiment, the glass conveying roller is described. However, according to the glass conveying roller of the present embodiment, the glass can be supported and conveyed by the belt-shaped film functioning as the buffer layer formed on the surface of the roller. As a result, direct contact between the glass to be conveyed and the roller can be prevented, and generation of scratches on the glass surface can be suppressed.
Further, it is possible to reduce the contact portion (contact area) between the glass surface and the scratch-preventive agent (strip-shaped film), and even when the strip-shaped film adheres to the glass surface, have. As a result, it is possible to inspect the glass surface on the side in contact with the glass conveying roller for scratches by the automatic inspection machine, and to find out the scratches with higher accuracy. In addition, since scratches can be found early, the yield can be improved.
[Second Embodiment]
In this embodiment, a method of manufacturing a float glass using the glass conveying roller described in the first embodiment will be described.
The float plate glass can be produced by, for example, a manufacturing method having the following steps.
A melting step of melting a glass raw material to obtain a molten glass,
A molding step in which the molten glass is supplied onto the molten metal in the float bath to form a glass ribbon,
A slow cooling step of conveying the glass ribbon by a conveying roller in a gradual cooling furnace,
A conveying step of conveying the glass ribbon to a cutting step for cutting the glass ribbon by the conveying roller after the slow cooling step,
Cutting process to cut glass ribbon.
Further, for example, after the melting process, various processes such as a step of polishing the end face or the main plane after the defoaming process or the cutting process can be added as needed.
In the method of manufacturing the float glass of the present embodiment, the glass conveying roller described in the first embodiment can be used when glass (glass ribbon) is conveyed. Particularly, in the slow cooling step and / or the conveyance step, it is preferable to use the glass conveying roller described in the first embodiment when conveying the glass ribbon.
Since the specific form of the glass conveying roller is the same as that described in the first embodiment, the explanation is omitted here.
By using the glass conveying roller described in the first embodiment when conveying the glass, the glass can be supported and conveyed by the belt-shaped film functioning as the buffer layer formed on the surface of the roller. As a result, direct contact between the glass to be conveyed and the roller can be prevented, and generation of scratches on the glass surface can be suppressed.
In addition, it is possible to reduce the contact portion (contact area) between the glass surface and the scratch-preventive agent, and even if a part of the strip-shaped film adheres to the glass surface, the contact (adhesion) range can be minimized. As a result, it is possible to inspect the glass surface on the side in contact with the glass conveying roller for scratches by the automatic inspection machine, and to find out the scratches with higher accuracy. In addition, since scratches can be found early, the yield can be improved.
As described above, the glass conveying roller described in the first embodiment can be used when conveying glass (glass ribbon), and the range of the glass conveying roller is not particularly limited.
However, since the glass conveying roller described in the first embodiment forms the belt-shaped film on the roller as described above, the surface of the glass conveying roller has a concavo-convex shape. Therefore, depending on the viscosity (temperature) of the glass to be conveyed, the concavo-convex shape of the surface of such a glass conveying roller may be transferred to the original flat surface shape. In order to avoid such a situation, it is preferable that the glass conveying roller described in the first embodiment is provided in a temperature region in which the viscosity of the glass to be conveyed is in a range from a viscosity at a standstill temperature of +50 DEG C to a viscosity at a frost point Do.
Specifically, for example, when the glass to be conveyed is an alkali-free glass, it is preferable to use the glass conveying rollers described in the first embodiment in a temperature range of the glass to be conveyed of 700 ° C to 800 ° C . When the glass to be conveyed is alkali glass, it is preferable to use the glass conveying rollers described in the first embodiment in a temperature range of the glass to be conveyed at a temperature of 500 占 폚 to 600 占 폚.
In a region other than the above temperature range, a normal roller which does not form a strip-shaped film can be used. However, also in this case, since the anti-fouling agent is transferred from the glass conveying roller to the surface of the glass (on the surface in contact with the conveying roller) in a strip shape when passing through the glass conveying roller described in the first embodiment, It is possible to suppress the occurrence of scratches even after the roller is brought into contact with the roller.
Here, a structural example of a manufacturing method of a float plate glass using a plurality of glass conveying rollers described in the first embodiment will be described with reference to Fig. 3 (a top view) showing a state in which glass (glass ribbon) 21 is conveyed by a plurality of
Although it has been described in the first embodiment, it is preferable that the position where the band-shaped film is formed is the cutting position or the vicinity thereof when the glass (glass ribbon) is used as the final product.
By arranging in this manner, even when the anti-fouling agent contained in the strip-shaped film adheres to the glass, the area to which the anti-flaw agent is adhered can be suppressed to a minimum range, and the glass surface can not be inspected for scratches by the automatic inspection machine The range can be minimized.
When a plurality of the glass conveying rollers described in the first embodiment are used as described above, the time required for the glass to pass through these glass conveying rollers, specifically, the section indicated by the arrow a in Fig. 3, Is preferably within 1 minute, and more preferably within 30 seconds.
This is because when the glass continuously contacts with the glass conveying roller described in the first embodiment having the concavo-convex shape for a long time, the concave-convex shape is transferred to its surface depending on the viscosity of the glass, This is because it may become difficult.
The contact time is a time period of continuous contact with the glass conveying roller of the first embodiment. After the contact is made by the time contact, the glass is conveyed by a roller having no concavo-convex shape and then conveyed by the glass conveying roller of the first embodiment . Further, even when the concavoconvex shape is transferred to the glass surface, for example, a step of removing the distortion (unevenness remaining on the surface) by heating the glass again at a distortion point or more may be performed.
In addition, in the slow cooling step and / or the transport step of the production method of float glass in the present embodiment, SO 2 gas may be supplied to and contacted with the glass to form a buffer layer on the surface thereof. By forming the buffer layer by bringing the SO 2 gas into contact with the glass as described above, the occurrence of scratches can be further suppressed. In addition, the buffer layer formed by contacting the SO 2 gas to the glass is very thin, for example, its thickness is on the order of nanometers and does not affect the scratch test of the glass surface by the automatic inspection machine.
Further, when SO 2 gas is supplied to the glass to form a buffer layer on the surface thereof, a certain amount of time is required for the reaction between the SO 2 gas and the glass surface. As a result, the glass ribbon taken out from the float bath is conveyed by the glass conveying rollers described in the first embodiment, and the SO 2 gas is supplied and brought into contact with the glass ribbon. Thereafter, the glass ribbon is conveyed by the glass conveying roller having no ordinary band- . With this configuration, scratches are prevented from being generated by the glass conveying roller described in the first embodiment on the upstream side, and scratches due to contact with the glass conveying roller are generated by the buffer layer formed by the reaction with SO 2 in the downstream portion Can be prevented. In this way, the occurrence of scratches can be suppressed by the complementary action of both.
In the case of alkali glass, most of the substances formed on the surface of the glass by supplying the SO 2 gas to the glass are sulfate salts of Na, Ba, Ca, Mg and K, which can prevent scratches from occurring as a buffer layer. In addition, as described above, in the case of alkali-free glass, since sulfate is not produced in most cases, when the glass to be transported is alkali-free glass, it may not be constituted to supply SO 2 gas.
Although the method of manufacturing the float plate glass using the glass conveying roller described in the first embodiment has been described in this embodiment, according to the method of manufacturing the float plate glass of this embodiment, the float plate glass having few scratches on the surface of the glass sheet is manufactured can do.
Further, it is possible to reduce the contact portion (contact area) between the glass surface and the scratch-preventive agent (strip-shaped film), and the area of the scratch prevention agent transferred from the glass conveying roller becomes also limited. This makes it possible to inspect the glass surface of the glass surface on the side in contact with the glass conveying roller for scratches on the glass surface by the automatic inspecting machine and to find the scratches with higher accuracy. In addition, since the time required for detection can be shortened, the yield can be improved. In addition, since scratches can be found early, the yield can be improved.
[Third embodiment]
In this embodiment, a manufacturing apparatus for a float glass plate having the glass conveying roller described in the first embodiment will be described.
A configuration example of a manufacturing apparatus for a float plate glass will be described with reference to Fig. Fig. 4 is a cross-sectional view of a portion of a device for drawing a glass ribbon from a float bath and a float bath and transporting (slowly cooling) the glass ribbon. Fig. Further, the apparatus for producing a float glass is not limited to the above-described portion, and a melting furnace for melting the glass raw material, a cutting apparatus for cutting the manufactured glass, and the like may be further provided.
The
In the apparatus for manufacturing float glass according to the present embodiment, the glass conveying roller described in the first embodiment can be used for conveying the glass. It is preferable to use the glass conveying roller described in the first embodiment as a glass conveying roller when the glass ribbon is conveyed in the gradual cooling path and / or when the glass ribbon is conveyed from the gradual cooling path to the cutting device.
With this configuration, since the glass can be supported and conveyed by the belt-shaped film functioning as the buffer layer formed on the surface of the glass conveying roller described in the first embodiment, direct contact between the conveying glass and the glass conveying roller can be prevented , The generation of scratches on the glass surface can be suppressed.
Further, it is possible to reduce the contact area between the glass being conveyed and the scratch-preventive agent (strip-shaped film), and even when the strip-shaped film is adhered to the glass surface, the contact (attachment) range can be minimized. As a result, it is possible to inspect the glass surface on the side in contact with the glass conveying roller for scratches by the automatic inspection machine, and to find out the scratches with higher accuracy. In addition, since scratches can be found early, the yield can be improved.
As described above, in the apparatus for manufacturing a float glass of the present embodiment, the glass conveying roller described in the first embodiment can be used for conveying glass (glass ribbon), and the range of the glass conveying roller is not particularly limited.
However, since the glass conveying roller described in the first embodiment forms the belt-shaped film on the roller as described above, the surface of the glass conveying roller has a concavo-convex shape. Therefore, depending on the viscosity (temperature) of the glass to be conveyed, the concavo-convex shape of the surface of such a glass conveying roller may be transferred to the original flat surface shape. In order to avoid such a situation, it is preferable that the glass conveying roller is provided in a temperature region where the viscosity of the glass to be conveyed is in a range from a viscosity at a standstill cold point + 50 DEG C to a viscosity at a cold point.
Specifically, for example, in the case where the glass conveyed in the apparatus for producing float glass is alkali-free glass, the temperature of the glass to be conveyed is in the range of 700 ° C. to 800 ° C., As shown in Fig. When the glass to be conveyed in the float plate glass device is alkali glass, it is preferable to provide the glass conveying roller described in the first embodiment in the temperature range of the glass to be conveyed at a temperature of 500 占 폚 to 600 占 폚.
For example, in a region where the glass conveying roller is not provided, which is described in the first embodiment, for example, in a region other than the above temperature range, a normal roller that does not form a strip-shaped film can be used. However, also in this case, since the anti-fouling agent is transferred from the glass conveying roller to the surface of the glass (on the surface in contact with the conveying roller) in a strip shape when passing through the glass conveying roller described in the first embodiment, It is possible to suppress the occurrence of scratches even after the roller is brought into contact with the roller.
In the apparatus for manufacturing float glass according to the present embodiment, when the glass conveying roller described in the first embodiment is used as described above, a solution containing an anti-fouling agent is placed in the vicinity of the roller It is preferable to provide a
This is because when the glass is conveyed, the strip-shaped
Further, as described in the first embodiment, a heating mechanism may be provided after supplying a solution containing an anti-scratch agent to vaporize the solvent in the solution until it is in contact with the glass.
Further, it is preferable that the
It is preferable that the nozzle has one nozzle for each strip-shaped film. That is, for example, when a plurality of strip-shaped films are formed on one glass conveying roller, it is preferable to have a plurality of nozzles in accordance with the number of strip-shaped films. However, by configuring the position of the nozzle so as to be displaceable, the number of nozzles may be smaller than the number of the strip-shaped films to be formed (or one nozzle for the glass conveying roller).
As described in the second embodiment, when a plurality of the glass conveying rollers described in the first embodiment are provided in the apparatus for manufacturing a float glass of the present embodiment, as shown in Fig. 3, It is preferable that the position is arranged on the same straight line (a region sandwiched between the dotted
By arranging in this way, even when an anti-fouling agent constituting the band-shaped film adheres to the glass, the area to which the anti-flaw agent is adhered can be suppressed to the minimum, and the range in which scratches on the glass surface can not be inspected by the automatic inspection machine can be minimized .
When a plurality of the glass conveying rollers described in the first embodiment are used as described above, the time required for the glass to pass through these glass conveying rollers, specifically, the interval indicated by the arrow a in Fig. 3 The time required for the glass to pass through is preferably within 1 minute, more preferably within 30 seconds.
This is because when the glass continuously contacts with the glass conveying roller described in the first embodiment having the concavo-convex shape for a long time, the concave-convex shape is transferred to its surface depending on the viscosity of the glass, This is because it may become difficult.
The contact time is a time for continuously contacting the glass conveying roller of the first embodiment. After the contact is made by the time contact, the glass is conveyed by a roller (not having a belt-like film) By a glass conveying roller of a glass. Further, even when the concavoconvex shape is transferred to the glass surface, for example, a step of removing the distortion (unevenness remaining on the surface) by heating the glass again at a distortion point or more may be performed.
Further, in the apparatus for manufacturing float glass of the present embodiment, SO 2 gas may be supplied to and contacted with the glass in the slow cooling step and / or the conveying step to form a buffer layer on the surface thereof. In this way brought into contact with a SO 2 gas and the glass forming the buffer layer it can be reduced than the occurrence of scratches. In addition, the buffer layer formed by contacting the SO 2 gas to the glass is very thin, for example, its thickness is on the order of nanometers and does not affect the scratch test of the glass surface by the automatic inspection machine.
Further, when SO 2 gas is supplied to the glass to form a buffer layer on the surface thereof, a certain amount of time is required for the reaction between the SO 2 gas and the glass surface. As a result, while the glass ribbon taken out from the float bath is conveyed by the glass conveying roller described in the first embodiment, the SO 2 gas is supplied to and contacted with the glass ribbon, and thereafter, the glass conveying roller As shown in Fig. With this configuration, scratches are prevented from being generated by the glass conveying roller described in the first embodiment on the upstream side, and scratches due to contact with the glass conveying roller are generated by the buffer layer formed by the reaction with SO 2 in the downstream portion Can be prevented. In this way, the occurrence of scratches can be suppressed by the complementary action of both.
In the case of alkali glass, most of the materials formed on the surface of the glass by supplying the SO 2 gas to the glass are sulfate salts of Na, Ba, Ca, Mg and K, and they can prevent scratches as a buffer layer. In addition, as described above, in the case of alkali-free glass, since almost no sulfate is produced, when the glass to be transported is alkali-free glass, it may be configured not to supply SO 2 gas.
The type of glass produced in the apparatus for manufacturing float glass in the present embodiment is not particularly limited. However, when the glass to be produced is alkali-free glass, even if SO 2 gas is supplied to the glass, since the sulfate is hardly formed on the surface of the glass, the buffer layer can hardly be formed and the occurrence of scratches due to contact with the conveying rollers There is a problem that it can not be prevented. Because of this, the effect of the apparatus for producing float glass of the present embodiment can be particularly exerted, so that the glass produced in the apparatus for manufacturing float glass of the present embodiment is preferably an alkali-free glass.
In particular, the alkali-free glass produced in this embodiment is preferably an alkali-free glass for a flat panel display substrate requiring high quality. Specifically, the following alkali-free glass is preferable.
As a mass percentage indication based on oxide,
SiO 2 : 50 to 73%
Al 2 O 3 : 10.5 to 24%
B 2 O 3 : 0 to 12%
MgO: 0 to 8%
CaO: 0 to 14.5%
SrO: 0 to 24%
BaO: 0 to 13.5%
MgO + CaO + SrO + BaO: 8 to 29.5%
ZrO 2 : 0 to 5%
Alkali-free glass.
In the case where the distortion point is high and the solubility is taken into consideration, more preferably,
SiO 2 : 58 to 66%
Al 2 O 3 : 15 to 22%
B 2 O 3 : 5 to 12%
MgO: 0 to 8%
CaO: 0 to 9%
SrO: 3 to 12.5%
BaO: 0 to 2%
MgO + CaO + SrO + BaO: 9 to 18%
Alkali-free glass.
In the case of considering a high distortion point, it is more preferable to use, as an oxide-based mass percentage indication,
SiO 2 : 54 to 73%
Al 2 O 3 : 10.5 to 22.5%
B 2 O 3 : 0 to 5.5%
MgO: 0 to 8%
CaO: 0 to 9%
SrO: 0 to 16%
BaO: 0 to 2.5%
MgO + CaO + SrO + BaO: 8 to 26%
Alkali-free glass.
It is also preferable that the glass to be conveyed by the glass conveying roller in the first embodiment or the glass to be produced by the manufacturing method of the float plate glass in the second embodiment is alkali-free glass for the same reason. More preferably, it is an alkali-free glass having the above-mentioned composition.
As described above, in the present embodiment, the apparatus for manufacturing a float glass plate using the glass conveying roller described in the first embodiment has been described. However, according to the apparatus for manufacturing a float glass plate according to the present embodiment, a float plate glass having few scratches Can be manufactured.
Further, it is possible to reduce the contact portion (contact area) between the glass surface and the scratch-preventive agent (strip-shaped film), and the area of the scratch prevention agent transferred from the glass conveying roller becomes also limited. This makes it possible to inspect the glass surface of the glass surface on the side in contact with the glass conveying roller for scratches on the glass surface by the automatic inspecting machine and to find the scratches with higher accuracy. In addition, since the time required for detection can be shortened, the yield can be improved. In addition, since scratches can be found early, the yield can be improved.
Example
Hereinafter, the present invention will be described by way of specific examples and comparative examples, but the present invention is not limited to these examples.
[Example 1]
A float glass ribbon was formed in the molding step, and after the glass ribbon was drawn out from the float bath, the glass ribbon was conveyed to the conveying roller in the slow cooling step.
The roller from the first contacted roller to the 10th roller after the glass ribbon was taken out from the float bath was made into a roller having the belt-shaped film of the present invention, and the remaining rollers were made into rollers having no belt-shaped film.
The band-shaped membrane was provided with a jet nozzle at a predetermined position with respect to the conveying roller, and an MgSO 4 aqueous solution (concentration 20 wt%) was jetted onto the conveying roller at 0.2 g / min to form a belt-shaped film.
The band-shaped film had a band thickness of 5 mm, a band width of 10 mm, and a band interval of 300 mm. The glass ribbon was 0.7 mm thick non-alkali glass (standing temperature of 717 캜), the conveying speed was 300 m / h, the glass ribbon temperature when passing through the first roller was 750 캜, The temperature was 720 占 폚. SO 2 gas spraying was also carried out simultaneously at the position of the fourth conveying roller in order to suppress scratches and the like caused by the contact of the 11th and subsequent conveying rollers with the glass ribbon.
At the rear end of the slow cooling step, an optical scratch detection device was provided, and scratches were detected on portions other than the portions corresponding to the strip-shaped films of the glass ribbon, and the scratch occurrence frequency A (number / m 2) was measured. Thereafter, the glass ribbon was taken out, and a portion corresponding to the strip-shaped film of the glass ribbon was visually inspected for scratches, and the occurrence frequency B (number / number of scratches) of the strip-shaped film portion was measured, (C = B / (A + B) x 100 (%)) was calculated.
The results are shown in Table 1.
[Comparative Example 1]
An experiment was conducted under the same conditions as in Example 1 except that no belt-shaped film was formed on the conveying roller.
The results are shown in Table 1. Further, in this comparative example, since there is no portion corresponding to the strip-shaped film, only the occurrence frequency A of scratches was measured for the entire glass ribbon.
[Example 2]
In Example 1, the experiment was conducted under the same conditions except that the band-shaped film had a band thickness of 0.5 mm, a band width of 10 mm, and a band gap of 300 mm. The results are shown in Table 1.
[Example 3]
In Example 1, the experiment was conducted under the same conditions except that the band-shaped film had a band thickness of 5 mm, a band width of 10 mm, and a band gap of 1000 mm. The results are shown in Table 1.
[Example 4]
In Example 1, the experiment was conducted under the same conditions except that the band-shaped film had a band thickness of 5 mm, a band width of 75 mm, and a band gap of 300 mm. The results are shown in Table 1.
[Example 5]
Experiments were carried out in the same manner as in Example 1 except that the rollers having the strip-shaped film of Example 1 were applied to the first to the 30th glass-conveying rollers from which the glass ribbon was first drawn out from the float bath. The temperature of the glass ribbon when passing through the 30th glass conveying roller was 620 占 폚. The results are shown in Table 1.
According to this, it was confirmed that the scratch occurrence frequency A was suppressed to be low in all of Examples 1 to 5 using the glass conveying roller having the strip-shaped film formed thereon.
In Example 5, it was confirmed that slight warping occurred although it was not a problem as a product.
Although the glass conveying roller, the manufacturing method of the float glass, and the manufacturing apparatus of the float glass have been described above, the present invention is not limited to the above-described embodiments and examples. Various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
The present application claims priority based on Japanese Patent Application No. 2012-252516 filed on November 16, 2012 with the Japanese Patent Office, and the entire contents of Japanese Patent Application No. 2012-252516 are incorporated herein by reference.
10 Glass conveying roller
12 strip film
Claims (7)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JPJP-P-2012-252516 | 2012-11-16 | ||
| JP2012252516 | 2012-11-16 |
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| Publication Number | Publication Date |
|---|---|
| KR20150085811A true KR20150085811A (en) | 2015-07-24 |
Family
ID=50731026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020157011476A KR20150085811A (en) | 2012-11-16 | 2013-10-25 | Glass transport roller, method for manufacturing float plate glass, and device for manufacturing float plate glass |
Country Status (4)
| Country | Link |
|---|---|
| KR (1) | KR20150085811A (en) |
| CN (1) | CN104812715B (en) |
| TW (1) | TW201422549A (en) |
| WO (1) | WO2014077108A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0545034U (en) * | 1991-11-13 | 1993-06-18 | セントラル硝子株式会社 | Glass transport roller |
| US5707412A (en) * | 1994-09-30 | 1998-01-13 | Ppg Industries, Inc. | Method of reducing glass sheet marking |
| WO2009060868A1 (en) * | 2007-11-06 | 2009-05-14 | Asahi Glass Co., Ltd. | Roller for conveying float plate glass, process for producing the same, and process for producing float plate glass with the same |
| JP5672522B2 (en) * | 2010-03-25 | 2015-02-18 | 日本電気硝子株式会社 | Glass plate manufacturing method and apparatus |
-
2013
- 2013-10-25 KR KR1020157011476A patent/KR20150085811A/en not_active Application Discontinuation
- 2013-10-25 WO PCT/JP2013/079026 patent/WO2014077108A1/en active Application Filing
- 2013-10-25 CN CN201380059864.4A patent/CN104812715B/en active Active
- 2013-11-08 TW TW102140757A patent/TW201422549A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| TW201422549A (en) | 2014-06-16 |
| CN104812715B (en) | 2017-10-27 |
| WO2014077108A1 (en) | 2014-05-22 |
| CN104812715A (en) | 2015-07-29 |
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