WO2012132368A1 - Production method for glass sheet and glass sheet production device - Google Patents
Production method for glass sheet and glass sheet production device Download PDFInfo
- Publication number
- WO2012132368A1 WO2012132368A1 PCT/JP2012/002030 JP2012002030W WO2012132368A1 WO 2012132368 A1 WO2012132368 A1 WO 2012132368A1 JP 2012002030 W JP2012002030 W JP 2012002030W WO 2012132368 A1 WO2012132368 A1 WO 2012132368A1
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- WO
- WIPO (PCT)
- Prior art keywords
- glass
- molten glass
- tube
- pipe
- glass plate
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B7/00—Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
- C03B7/02—Forehearths, i.e. feeder channels
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- 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
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/06—Forming glass sheets
- C03B17/064—Forming glass sheets by the overflow downdraw fusion process; Isopipes therefor
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- 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
- C03B18/20—Composition of the atmosphere above the float bath; Treating or purifying the atmosphere above the float bath
- C03B18/22—Controlling or regulating the temperature of the atmosphere above the float tank
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B7/00—Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
- C03B7/02—Forehearths, i.e. feeder channels
- C03B7/06—Means for thermal conditioning or controlling the temperature of the glass
- C03B7/07—Electric means
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
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- 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
Definitions
- the present invention relates to a glass plate manufacturing method and a glass plate manufacturing apparatus.
- a glass plate is used for a display part of a flat panel display such as a liquid crystal display.
- the glass plate is produced by forming molten glass into a sheet-like sheet glass. Sheet glass is melted in a melting tank to form molten glass, and the molten glass is poured into a molding apparatus through a clarification tank that removes bubbles, a stirring tank that makes the composition distribution uniform, and the like. Molded into glass.
- platinum or a platinum alloy is used for an apparatus or piping through which molten glass melted in a melting tank flows. This is to prevent the molten glass from being contaminated by melting the materials constituting the apparatus and piping, and to adjust the temperature of the molten glass flowing inside by flowing electricity to the apparatus and piping itself. It is.
- the temperature of the molten glass is as high as about 1000 ° C. to 1700 ° C. Therefore, thermal expansion is taken into consideration for the piping and apparatus for conveying the molten glass.
- Patent Document 1 Japanese Patent No. 449830
- the outer wall and the inner wall of the pipe through which molten glass flows bulge in the radial direction.
- the bulging part to be formed is formed in a spiral shape in the peripheral part.
- Patent Document 1 Japanese Patent No. 4498390
- the piping for conveying the molten glass is often divided into a plurality of parts. This is because, if the pipe is not divided into a plurality of parts, it becomes difficult to absorb the elongation due to the thermal expansion that occurs when the pipe or the device rises to the operating temperature. That is, because the elongation due to thermal expansion cannot be absorbed, there is a risk that the piping and the apparatus may be deformed or damaged. For this reason, in patent document 1, in the state which heated up piping and a device to predetermined temperature (in a high temperature state), by connecting a plurality of divided piping and devices by welding etc., the pipe and devices after connection are connected. It is trying to reduce the amount of expansion due to expansion and suppress deformation of piping and equipment.
- thermal expansion corresponding to the temperature difference occurs in these and peripheral members. That is, in such a case, it is considered that thermal expansion and thermal distortion occur in the piping, apparatus, and peripheral members for conveying the molten glass. And it is because it is thought that the deformation
- the temperature of the pipe is raised in advance, it is actually difficult to raise the temperature to the temperature at the time of operation in consideration of the workability of an operator who performs welding or the like. Therefore, even if the temperature of the pipe is raised to a predetermined temperature in advance in order to suppress deformation and damage due to thermal expansion, after the pipe is connected and brought into the operating state, the temperature is further increased to the operating temperature. Become. For this reason, thermal expansion of the piping still occurs, and there is a concern that the piping may be deformed or damaged.
- the glass plates used therefor have also been on the trend of increasing size.
- the molding apparatus becomes larger, so in order to maintain productivity, it is necessary to increase the amount of molten glass that flows into the molding apparatus in one day.
- the piping and the apparatus through which the molten glass flows tend to increase in size.
- the size of the pipe or the apparatus is increased, there is a problem that the amount of expansion when the temperature is raised increases, and the damage or deformation of the pipe becomes remarkable.
- the temperature of the fining tank or the surrounding pipes needs to be higher than when As 2 O 3 is contained as a fining agent. For this reason, there is a problem that the amount of expansion of the clarification tank and the surrounding piping increases, and the damage and deformation of the piping become remarkable.
- Patent Document 1 sufficiently suppresses damage and deformation of the pipes. Have difficulty.
- an object of the present invention is to provide a glass plate manufacturing method and a glass plate manufacturing apparatus capable of suppressing deformation and breakage of piping through which molten glass flows with simpler work.
- the glass plate manufacturing method includes a melting step, a conveying step, a supplying step, a forming step, and a cutting step.
- the melting step the glass raw material is melted to obtain molten glass.
- the transporting process the molten glass is transported by flowing into a pipe made of a platinum group element or a platinum group element alloy.
- the supplying step molten glass is supplied to the molding apparatus.
- the forming step the molten glass supplied in the supplying step is formed into a sheet glass.
- the cutting step the sheet glass is cut to form a glass plate.
- the piping for transporting the molten glass in the transporting process has a first tube and a second tube, and a covering member.
- the first pipe and the second pipe are arranged apart from each other, and a thermal expansion allowable space that allows thermal expansion during operation is formed therebetween.
- the covering member covers the end portions of the first tube and the second tube and the thermal expansion allowable space, and is movable in the axial direction with respect to the first tube and the second tube.
- the conveying process includes a viscosity increasing process. In the viscosity increasing step, when the molten glass is transported from the first tube to the second tube through the thermal expansion allowable space, the amount of heat transferred from the molten glass to the outside of the covering member is determined from the molten glass to the first tube. The viscosity of the molten glass is increased by increasing the amount of heat transferred to the outside of the first tube and the second tube.
- the covering member is not limited to covering the entire circumference of the first tube and the second tube.
- the piping through which the molten glass flows can be brought into the operating state with a simple operation.
- the viscosity of a part of the molten glass is increased between the end of the first tube on the second tube side and the cover member, and the end of the second tube on the first tube side and the cover member It is preferable to increase the viscosity of a part of the molten glass between.
- the covering member in the transporting process has a covering portion and at least one flange portion.
- the cover covers the first tube, the second tube, and the thermal expansion allowable space.
- the flange portion extends outward from the cover portion.
- At least one opening is formed in the cover part, the flange part extends outward from the opening part forming part that forms the opening part, and a space between the flange parts is formed by the flange part.
- the glass plate is free of As 2 O 3 as a glass raw material is dissolved substantially in the dissolution step is preferably a glass plate for a liquid crystal display.
- the strain point of the glass used for manufacturing the glass plate is 655 ° C. or higher.
- the glass raw material preferably contains tin oxide as a fining agent.
- the glass plate contains SiO 2 and Al 2 O 3 , the total content of the SiO 2 and the Al 2 O 3 in the glass plate is 70% by mass or more, and the alkali metal oxide of the glass plate The content is preferably 2% by mass or less.
- the said glass plate is an alkali free glass which does not contain an alkali metal oxide substantially.
- the glass plate a SiO 2 50 ⁇ 70 wt%, B 2 O 3 0 to 15 mass%, the Al 2 O 3 5 ⁇ 25 wt%, the MgO 0 ⁇ 10 wt%, 0-20 mass CaO %, SrO 0 to 20% by mass, BaO 0 to 10% by mass, RO 5 to 20% by mass (where R is a component contained in the glass plate selected from Mg, Ca, Sr and Ba, It is preferable to contain at least one kind.
- the supplying step it is preferable to supply the molten glass of 6 t or more per day to the molding apparatus.
- the glass plate manufacturing apparatus includes a melting tank, a forming apparatus, and piping.
- the melting tank melts the glass raw material to form molten glass.
- the forming apparatus forms molten glass into sheet glass.
- the piping is made between a platinum group element or a platinum group element alloy, which is disposed between the melting tank and the molding apparatus and in which molten glass flows.
- the pipe includes a first pipe and a second pipe that are spaced apart from each other, and a covering member that is movable in the axial direction with respect to the first pipe and the second pipe. A thermal expansion allowable space that allows thermal expansion during operation is formed between the first pipe and the second pipe.
- the covering member covers the end portions of the first tube and the second tube and the thermal expansion allowable space, and is movable in the axial direction with respect to the first tube and the second tube. Further, when the pipe conveys the molten glass from the first pipe to the second pipe through the thermal expansion allowable space, the pipe transfers the amount of heat transfer from the molten glass to the outside of the covering member from the molten glass to the first pipe and the second pipe. The viscosity of the molten glass is increased by increasing the amount of heat transfer to the outside of the tube.
- piping should just be arrange
- the pipe through which the molten glass flows can be brought into a state during operation with a simple operation.
- FIG. 1 is a partial flowchart of the glass plate manufacturing method according to the present embodiment. Hereinafter, the manufacturing method of a glass plate is demonstrated using FIG.
- the glass plate is manufactured through various processes including a melting process ST1, a refining process ST2, a homogenizing process ST3, a supplying process ST4, and a forming process ST5.
- a melting process ST1 a refining process ST2
- a homogenizing process ST3 a homogenizing process ST3
- a supplying process ST4 a supplying process ST5
- a forming process ST5 a forming process ST5.
- the glass raw material is melted.
- Glass raw material is a composition such as SiO 2, Al 2 O 3.
- the glass raw material thrown into the furnace is heated and melted.
- the completely melted glass raw material becomes molten glass, and flows out to the accommodating portion where the clarification step ST2, which is the next step, is performed.
- the molten glass is clarified. Specifically, the gas component contained in the molten glass is discharged out of the molten glass as bubbles, or is dissolved in the molten glass. The clarified molten glass flows out to the accommodating portion where the next step, the homogenization step ST3, is performed.
- the molten glass is homogenized. Specifically, the molten glass is homogenized by stirring. In this step, the temperature of the molten glass that has been clarified is adjusted. The homogenized molten glass flows out to the accommodating part where the next process, the supply process ST4, is performed.
- the molten glass is supplied to an apparatus for forming molten glass.
- the molten glass is cooled to a temperature suitable for starting the formation of the sheet-like sheet glass.
- the molten glass is formed into a sheet glass.
- the formed sheet glass plate is cut in a cutting process using a cutting device to become a glass plate.
- a cutting device As a molding method, a downdraw method, a float method, a rollout method, or the like can be used. In the present embodiment, it is preferable to use the over-down draw method of the down-draw method. The overdown draw method will be described later.
- the cut glass plate is then subjected to processing such as cutting, grinding / polishing, and cleaning and inspection.
- FIG. 2 shows an example of the glass plate manufacturing apparatus 100 according to this embodiment.
- the glass plate manufacturing apparatus 100 includes a dissolution tank 101, a clarification tank 102, a stirring tank 103, a forming apparatus 104, a first pipe 105 (corresponding to a pipe), and a second pipe 106.
- the melting tank 101 is a tank for melting glass raw materials.
- the dissolution tank 101 is made of a refractory material such as brick, and has a liquid tank at the bottom.
- the dissolution tank 101 is heated by a burner that is appropriately disposed on the wall surface.
- the liquid tank is provided with an electric heating device for generating Joule heat from the glass raw material itself by energizing the glass raw material.
- An electrode of an electric heating device is provided on the wall surface of the liquid tank so as to be in contact with the glass raw material.
- the dissolution step ST1 is performed.
- the glass raw material heating means having the burner and the electrode has been described as an example.
- the present invention is not limited to this, and any glass material may be provided.
- the method for melting the glass raw material is not particularly limited to this, and the glass raw material can be melted using other heating means.
- the clarification tank 102 is a tank for removing bubbles from the molten glass melted in the melting tank 101. By further heating the molten glass fed from the melting tank 101 in the clarification tank 102, defoaming of bubbles in the molten glass is promoted. In the clarification tank 102, a clarification step ST2 is performed. More specifically, the temperature of the molten glass in the fining tank 102 is equal to or higher than the temperature at which the fining agent releases a gas component (for example, oxygen if tin oxide), and the gas component is added to the existing bubbles in the molten glass. Is increased to a temperature at which the bubble diameter of the existing bubbles expands.
- a gas component for example, oxygen if tin oxide
- the temperature of the molten glass is raised to a temperature higher than a temperature at which a viscosity (200 to 800 poise) at which bubbles in the molten glass become a sufficient flying speed is realized.
- the bubble in molten glass is discharge
- the temperature of the molten glass is lowered, and bubbles remaining in the molten glass are absorbed by the fining agent.
- the disappearance of bubbles may be performed in the clarification tank 102, the first pipe 105, and the stirring tank 103.
- the stirring tank 103 has a stirring device including a container for containing molten glass, a rotating shaft, and a stirring blade attached to the rotating shaft.
- a container a rotating shaft, and a stirring blade, although the thing made from platinum group elements, such as platinum, or the alloy of a platinum group element, for example can be used, it is not restricted to this.
- a driving unit such as a motor
- the stirring blade attached to the rotating shaft stirs the molten glass.
- the homogenization step ST3 is performed.
- the glass raw material is charged into the dissolution tank 101 and the melting process ST1, the clarification process ST2, and the homogenization process ST3 are performed (that is, the dissolution tank 101, the clarification tank 102, the first pipe 105, the stirring).
- the process in which the molten glass flows into the tank 103 and the second pipe 106 is referred to as a conveyance process.
- the forming apparatus 104 includes a formed body in which a groove is formed in an upper portion and a longitudinal section has a wedge shape. The groove is formed along the longitudinal direction of the molded body.
- the molded body is a refractory material.
- the molding device 104 includes a roller that extends downward from the molten glass that overflows the molded body and joins at the lower end of the molded body, a cooling device that gradually cools the glass, and the like.
- a molding step ST5 is performed. In the supply process ST4, 6 t or more of molten glass per day is supplied to the molding apparatus 104.
- the first pipe 105 and the second pipe 106 are pipes made of a platinum group element (platinum, iridium, osmium, palladium, rhodium, ruthenium, etc.) or a platinum group element alloy.
- the first pipe 105 is a pipe that connects the clarification tank 102 and the stirring tank 103.
- the second pipe 106 is a pipe that connects the stirring tank 103 and the molding apparatus 104.
- the clarification tank 102, the first pipe 105, the stirring tank 103, and the second pipe 106 made of a platinum group element or a platinum group element alloy are heated by passing a current directly through the platinum group element or the platinum group element alloy. It is preferable.
- the temperature of the molten glass can be increased efficiently. For this reason, even when tin oxide is used as a fining agent, the temperature of the molten glass can be easily raised to a temperature at which tin oxide effectively functions as a fining agent (for example, to 1620 ° C. or higher).
- the heating method of the clarification tank 102, the 1st piping 105, the stirring tank 103, and the 2nd piping 106 is not limited to the said method,
- the clarification tank 102, the 1st piping 105, the stirring tank 103, the 2nd piping 106 It is also possible to install a heating device such as an electric heater around and heat by the heating device.
- FIG. 3 is a schematic exploded perspective view of the first pipe 105.
- the first pipe 105 includes a first pipe 111, a second pipe 112, and a covering member 113.
- the first tube 111 is a hollow tube made of a platinum group element or a platinum group element alloy, and is connected to the clarification tank 102.
- the first pipe 111 protrudes in the first direction in which molten glass flows from the clarification tank 102 to the stirring tank 103.
- the second tube 112 is a hollow tube made of a platinum group element or a platinum group element alloy, and is connected to the stirring vessel 103.
- the second pipe 112 protrudes from the stirring tank 103 in a second direction that is opposite to the first direction.
- the first pipe 111 and the second pipe 112 for example, pipes having a diameter of 10 to 1000 mm (preferably 70 mm to 200 m) are used.
- tube 112 is not restricted to this.
- 1st space S1 (equivalent to thermal expansion allowable space) exists between the 1st pipe
- the first pipe 111 and the second pipe 112 are installed apart from each other.
- the length between the end faces of 111 and the second pipe 112 that are not opposite to each other is determined.
- the ends of the first tube 111 and the second tube 112 that are not opposite to each other that is, the end of the first tube 111 on the second direction side and the end of the second tube 112 on the first direction side)
- a plurality of layers of heat insulating materials are arranged.
- the covering member 113 includes an end portion on the second tube 112 side of the first tube 111 and an end portion on the first tube 111 side of the second tube 112 (that is, the end portion on the first direction side of the first tube 111 and the second end portion).
- the end of the tube 112 on the second direction side) and the first space S1 are covered. That is, the covering member 113 has a role of connecting the first tube 111 and the second tube 112 that are in a separated state. As a result, the molten glass flowing inside the first tube 111 can flow into the second tube 112. Further, the covering member 113 is movable in the axial direction (first direction and second direction) with respect to the first tube 111 and the second tube 112.
- the covering member 113 includes a first member 113a and a second member 113b.
- the first member 113a is made of a platinum group element or a platinum group element alloy, and covers the upper portions of the first tube 111 and the second tube 112.
- the first member 113a covers the first space S1 from above.
- the first member 113a has a cover part 213a and flange parts 213b and 213c.
- the covering portion 213a is a portion that covers the first tube 111, the second tube 112, and the first space S1.
- the cover part 213a draws an arc having a substantially semicircular cross-sectional shape cut perpendicularly to the surface in the longitudinal direction so that the first tube 111 and the second tube 112 can be covered.
- the flange portions 213b and 213c extend in the horizontal direction from the both ends of the cover portion 213a to the outside in the radial direction (specifically, the direction orthogonal to the horizontal plane horizontal in the first direction).
- the flange portions 213b and 213c extend in the horizontal direction from the cover portion 213a, but are not limited to those extending in the horizontal direction.
- the width W1 (see FIG. 4) of each of the flange portions 213b and 213c is preferably 20 mm or less (however, a natural number excluding 0), for example.
- the width W1 of the flange portions 213b and 213c is preferably 20 mm or less is because the flange portions 213b and 213c have a role as cooling fins. That is, if the width W1 of the flange portions 213b and 213c becomes too large (for example, becomes larger than the width of the first lower surface 414 of the first pressing member 114a described later), the first pipe 111 and the second pipe are unnecessarily necessary. This is to avoid the situation because the temperature of 112 and thus the temperature of the molten glass flowing inside the first tube 111 and the second tube 112 are cooled.
- the covering member 113 is made of a platinum group element or a platinum group element alloy which is relatively expensive compared to other metals, it is for the purpose of cost reduction.
- the second member 113b is made of a platinum group element or a platinum group element alloy, and covers the lower portions of the first tube 111 and the second tube 112.
- the second member 113b covers the first space S1 from below.
- the second member 113b has a symmetrical shape with the longitudinal axis of the first member 113a as an axis, and includes a cover portion 214a and flange portions 214b and 214c.
- cover part 214a and the flange parts 214b and 214c have the structure similar to the cover part 213a and the flange parts 213b and 213c of the 1st member 113a, description is abbreviate
- the 1st member 113a and the 2nd member 113b are not restricted to a symmetrical shape about those longitudinal axes.
- the first member 113a is supported by a first pressing member 114a described later.
- the second member 113b is supported by a support member (for example, a jack) (not shown) via a second pressing member 114b described later.
- gaps S2 and S3 exist between the first pipe 111 and the second pipe 112 and the first member 113a and the second member 113b in the circumferential direction. That is, the inner diameters of the first member 113a and the second member 113b are larger than the outer diameters of the first tube 111 and the second tube 112, respectively.
- the presence of the gap S ⁇ b> 2 and the gap S ⁇ b> 3 makes it easier for the covering member 113 to move in the axial direction of the first pipe 111 and the second pipe 112.
- the difference between the inner diameter of the first member 113a and the second member 113b and the outer diameter of the first pipe 111 and the second pipe 112 is preferably 5 mm or less (however, a natural number excluding 0). This is because molten glass can be prevented from leaking outside.
- flange-to-flange spaces S4 are formed, respectively.
- the first member 113a and the second member 113b are respectively formed of molten glass flowing through the first tube 111 and the second tube 112 between both ends of the first member 113a and both ends of the second member 113b. It arrange
- the vertical height of the space S4 between the flange portions (specifically, the distance between the lower surface of the flange portions 213b and 213c and the upper surface of the flange portions 214b and 214c) is 5 mm or less (however, a natural number excluding 0). It is preferable. This is because molten glass can be prevented from leaking outside.
- the first member 113a and the second member 113b are pressed by the pressing member 114.
- the pressing member 114 will be described below.
- FIG. 4 is a schematic perspective view of the covering member 113 and the pressing member 114.
- the pressing member 114 includes a first pressing member 114a that presses the first member 113a from above and a second pressing member 114b that presses the second member 113b from below.
- the first member 113a and the second member 113b are pressed in a direction approaching each other by the first pressing member 114a and the second pressing member 114b, respectively.
- the first pressing member 114a and the second pressing member 114b are block-like members having excellent fire resistance and heat resistance, and are, for example, bricks.
- the first pressing member 114a and the second pressing member 114b have a higher thermal conductivity than the heat insulating material disposed at the end portions of the first tube 111 and the second tube 112 that are not opposed to each other (preferably Is 1.2-20 W / m ⁇ K).
- Each of the first pressing member 114a and the second pressing member 114b is formed with spaces S5 and S6 that are opened in a substantially semicircular shape along the longitudinal direction on one end in the thickness direction.
- the inner diameters of the first pressing member 114 a and the second pressing member 114 b are the same as the outer diameter of the covering member 113. Therefore, in the state where the first pressing member 114a is attached to the first member 113a (the state during operation), the inner periphery of the arc portion 314 that forms the space S5 of the first pressing member 114a covers the first member 113a. It contacts the outer periphery of the part 213a. Further, in the state where the second pressing member 114b is attached to the second member 113b (operation state), the inner periphery of the arc portion 315 forming the space S6 of the second pressing member 114b covers the second member 113b. It contacts the outer periphery of the part 214a.
- the first lower surface 414 excluding the arc portion 314 of the first pressing member 114a is the flange portion 213b of the first member 113a.
- 213c is in contact with the upper surface.
- the 2nd lower surface 415 except the circular arc part 315 of the 2nd pressing member 114b contacts the lower surface of the flange parts 214b and 214c of the 2nd member 113b.
- the widths of the first lower surface 414 and the second lower surface 415 of the first pressing member 114a and the second pressing member 114b are respectively set to the flange portions 213b and 213c of the first member 113a and the flange portions 214b of the second member 113b.
- the width is preferably the same as 214c.
- the first pressing member 114a is supported and fixed by a support member (not shown) (for example, a screw).
- the second pressing member 114b is supported and fixed by a support member (for example, a jack) not shown.
- the first pressing member 114a and the second pressing member 114b are formed, for example, by cutting or casting a brick.
- the first direction end of the first pipe 111 connected to the clarification tank 102 and the second direction end of the second pipe 112 connected to the stirring tank 103 The first member 113a and the second member 113b are attached so as to cover the first space S1 between the first tube 111 and the second tube 112. Specifically, the first member 113a is attached from above the first tube 111 and the second tube 112, and the second member 113b is attached from below the first tube and the second tube 112. 5 shows a state in which the first member 113a and the second member 113b are properly attached to the first tube 111 and the second tube 112.
- the pressing member 114 is attached to the covering member 113.
- the first pressing member 114a is attached so that the inner periphery thereof is in contact with the outer periphery of the first member 113a and the inner periphery of the second pressing member 114b is in contact with the outer periphery of the second member 113b.
- the clarification tank 102, the stirring tank 103, the molding apparatus 104, the first pipe 105, the second pipe 106, and the like are set to a predetermined temperature (for example, 1500, which is the temperature during operation) by a temperature control device disposed in the vicinity. Temperature). Then start operation. In the state of operation, the glass raw material is melted in the melting tank 101, and the molten glass flows through the first pipe 105 toward the molding apparatus 104 (that is, melts into the first pipe 111 and the second pipe 112). Glass flows).
- a predetermined temperature for example, 1500, which is the temperature during operation
- the amount of heat transferred from the molten glass to the outside of the covering member 113 is increased compared to the amount of heat transferred to the outside during the conveyance of the molten glass through the first tube 111 and the second tube 112, thereby melting the molten glass.
- the viscosity of the glass is increased rapidly.
- the amount of heat transfer is the amount of heat transfer to the outside per unit length along the flowing direction of the molten glass.
- the viscosity increasing step a part of the molten glass in the space formed between the end portion of the first tube 111 on the second tube 112 side and the covering member 113 in the gap S2 and the gap S3.
- the viscosity of is increased.
- the viscosity of the molten glass in the vicinity of the flange portions 213b, 213c, 214b, and 214c (specifically, the molten glass that has entered the space S4 between the flange portions) is not so soft as to easily leak to the outside. On the other hand, the viscosity is such that viscous flow occurs.
- a known method can be applied as a method for measuring the viscosity of the molten glass.
- a ball pulling method, a penetration method, a beam bending method, or the like can be used as appropriate according to the viscosity of the molten glass.
- the thickness of the glass plate is not particularly limited, but may be 0.1 to 1.1 mm, 0.2 mm to 0.7 mm, or 0.2 mm to 0.5 mm.
- the size of the glass plate is not particularly limited.
- the length in the width direction may be 500 mm-3500 mm
- the length in the longitudinal direction may be 500 mm-3500 mm.
- the size of the pipes (first pipe 105 and second pipe 106) and apparatuses tend to increase as the glass plate becomes larger. is there. For this reason, the amount of thermal expansion of these pipes and devices increases, and the problem of damage to the pipes and devices becomes significant.
- the effect of the present invention is particularly remarkable. Moreover, the effect of the present invention becomes more remarkable as the length in the width direction of the glass is 2500 mm or more and 3000 mm or more.
- the type of the glass plate is not particularly limited, but may be borosilicate glass, aluminosilicate glass, aluminoborosilicate glass, soda lime glass, alkali silicate glass, alkali aluminosilicate glass, or alkali alumino gelate glass.
- the use of the glass plate is not particularly limited, but it may be used for a glass plate for a flat panel display (liquid crystal display, plasma display, etc.), a panel for solar cell, and a cover glass.
- the cover glass is, for example, tempered glass obtained by chemically or physically strengthening a glass plate in order to protect a display screen or housing of an AV device (such as a portable terminal).
- the glass plate is a mass% display and includes the following components.
- the indication in the following parentheses is the preferable content of each component, and the latter half is more preferable.
- SiO 2 50 to 70% (55 to 65%, 57 to 64%, 58 to 62%), Al 2 O 3 : 5 to 25% (10 to 20%, 12 to 18%, 15 to 18%), B 2 O 3 : 0 to 15% (5 to 15%, 6 to 13%, 7 to 12%).
- MgO 0 to 10% (lower limit is 0.01%, lower limit is 0.5%, upper limit is 5%, upper limit is 4%, upper limit is 2%), CaO: 0 to 20% (lower limit is 1%, lower limit is 3%, lower limit is 4%, upper limit is 9%, upper limit is 8%, upper limit is 7%, upper limit is 6%), SrO: 0 to 20% (lower limit is 0.5%, lower limit is 3%, upper limit is 9%, upper limit is 8%, upper limit is 7%, upper limit is 6%), BaO: 0 to 10% (upper limit is 8%, upper limit is 3%, upper limit is 1%, upper limit is 0.2%), ZrO 2 : 0 to 10% (0 to 5%, 0 to 4%, 0 to 1%, 0 to 0.1%).
- the glass plate is represented by the following mass%, SiO 2 : 50 to 70%, B 2 O 3 : 5 to 18%, Al 2 O 3 : 10 to 25%, MgO: 0 to 10%, CaO: 0-20%, SrO: 0 to 20%, BaO: 0 to 10%, RO: 5 to 20% (provided that R is at least one selected from Mg, Ca, Sr and Ba), It is preferable to contain. Further, R ′ 2 O: more than 0.2% and 2.0% or less (provided that R ′ is a component contained in a glass plate selected from Li, Na and K, and is at least one kind). It is preferable.
- the glass having a glass composition at this time is referred to as an alkali trace-containing glass, and the glass plate having this glass composition is referred to as an alkali trace-containing glass plate.
- the alkali trace glass may have a content of R ′ 2 O exceeding 0% and not more than 2.0%.
- an alkali trace glass having a content of R ′ 2 O of more than 0% and not more than 2.0% can be used, but preferably more than 0.2% and not more than 2.0%.
- R ′ 2 O may be substantially 0.0%.
- the glass having a glass composition at this time is called non-alkali glass, and the glass plate having this glass composition is called an alkali-free glass plate.
- the total amount of fining agents is 0.05 to 1.5% and substantially free of As 2 O 3 and PbO. More preferably, the iron oxide content in the glass is 0.01 to 0.2%.
- the glass plate is represented by the following mass%, SiO 2 : 50 to 70%, B 2 O 3 : 0 to 15%, Al 2 O 3 : 5 to 25%, MgO: 0 to 10%, CaO: 0-20%, SrO: 0 to 20%, BaO: 0 to 10%, RO: 5 to 20% (provided that R is a component contained in the glass plate selected from Mg, Ca, Sr and Ba, and is at least one kind) It is preferable to contain.
- the glass plate to be manufactured is a glass plate used for a flat panel display (such as a liquid crystal display or an organic EL display) using a TFT (Thin Film Transistor), from the viewpoint of suppressing the destruction of the TFT
- the glass plate to be produced is preferably an alkali-free glass plate.
- the glass plate produced in the present embodiment may be a glass plate containing a trace amount of alkali that dares to contain a trace amount of an alkali component. When the alkali metal oxide is eluted from the glass plate, the TFT may be destroyed.
- an alkali-free glass plate or a glass plate containing a trace amount of alkali is suitably used for a flat panel display using the TFT.
- the alkali metal oxide R ′ 2 O is more than 0.05% and not more than 2.0% in terms of mass%, more preferably R ′ 2 O is more than 0.1% and 1. It is preferable that it contains 0% or less (provided that R ′ is a component contained in a glass plate selected from Li, Na and K and is at least one kind). Further, it is preferable that 0.05 to 1.5% of the refining agent is contained in total (expressed by mass%), and AS 2 O 3 and PbO are not substantially contained.
- the content of iron oxide in the glass composition is more preferably 0.01% to 0.2% in terms of mass%.
- SrO + BaO is preferably 0 to 10% in terms of mass%.
- BaO is more preferably 0 to 2% in terms of mass%.
- the glass plate for flat panel display has a large content of SiO 2 and Al 2 O 3 as described above, and a content of alkali metal oxides (Li 2 O, Na 2 O, K 2 O).
- a small amount of alkali-containing glass plate or non-alkali glass plate is preferably used as described above.
- the meltability of the alkali trace-containing glass plate or the alkali-free glass plate is low.
- the molten glass having such a viscosity needs to raise the temperature of the clarification tank 102 and the surrounding piping as compared with the case of producing a glass plate using alkali-containing glass. For this reason, there is a problem that the expansion amount of the clarification tank 102 and the surrounding pipes increases, and the breakage and deformation of the pipes become remarkable. More specifically, in the clarification step, the speed at which the bubbles in the molten glass float is affected by the viscosity of the molten glass, and the foam floating speed increases as the viscosity of the molten glass decreases.
- the viscosity of the molten glass is set to 200 to 800 poise which is a viscosity suitable for fining.
- the melting property of the alkali trace glass or alkali-free glass plate is low, so in the case of alkali-free glass or alkali trace glass, the temperature of the molten glass needs to be further increased compared to the alkali-containing glass. There is.
- the temperature of the molten glass is higher than the temperature at which tin oxide begins to function as a refining agent (for example, 1620 ° C. or more, more preferably 1650 ° C. or higher, more preferably 1680 ° C. or higher). That is, the temperature of the clarification tank 102 provided on the downstream side of the dissolution tank 101 is increased to, for example, 1640 ° C. or more, and thereby the molten glass is, for example, 1620 ° C. or more, more preferably 1650 ° C., and still more preferably 1680 ° C. Heat to above.
- the temperature at which tin oxide begins to function as a refining agent for example, 1620 ° C. or more, more preferably 1650 ° C. or higher, more preferably 1680 ° C.
- the molten glass in which the glass raw material is melted in the melting tank 101 needs to be kept at a high temperature (for example, 1200 to 1600 ° C.) until it is supplied to the molding apparatus 104 after the fining tank 102.
- a high temperature for example, 1200 to 1600 ° C.
- an apparatus specifically, a melting tank, a clarification tank, an agitation tank, and a molding apparatus
- the expansion amount of the first pipe and the second pipe increases. Therefore, these devices and piping are easily damaged.
- a glass plate for a flat panel display having a high content of SiO 2 or Al 2 O 3 and a low content of alkali metal oxides (Li 2 O, Na 2 O, K 2 O) or not containing them at all is manufactured.
- the effect of the present invention becomes remarkable.
- the content of SiO 2 + Al 2 O 3 is 70 mass% or more (for example, 70 mass% to 95 mass%), and the content of alkali metal oxides (Li 2 O, Na 2 O, K 2 O) is 2
- the present invention is suitable for a glass plate having a mass% or less (for example, 0 to 2 mass% or less).
- the content of SiO 2 + Al 2 O 3 is 70% by mass or more (for example, 70% by mass to 95% by mass), and the content of alkali metal oxides (Li 2 O, Na 2 O, K 2 O) is 1
- the present invention is more suitable for a glass plate having a mass% or less (for example, 0 to 1 mass%). Further, the content of SiO 2 + Al 2 O 3 is 75% by mass or more (eg, 75% by mass to 95% by mass), and the content of alkali metal oxides (Li 2 O, Na 2 O, K 2 O) is 0
- the present invention is more suitable for a glass plate of 0.5 mass% or less (0 to 0.5 mass%).
- a temperature of the molten glass in order to obtain a sufficient bubble rising speed in the fining tank 102.
- it is necessary to set the temperature to 1620 ° C. or higher. Therefore, the amount of expansion of the platinum group element or platinum group element alloy constituting the fining tank 102 is increased in the molten glass as compared with the conventional alkali-containing glass. That is, in a molten glass having a temperature at which log ⁇ 2.5 is 1500 to 1750 ° C., the expansion of the platinum group element or the platinum group element alloy is likely to increase.
- the said molten glass is suitable for the manufacturing method of this embodiment.
- a glass plate applied to a cover glass or a glass plate for solar cells for example, a glass plate is represented by mass% and includes the following components.
- the indication in the following parentheses is the preferred content of each component.
- SiO 2 50 to 70% (55 to 65%, 57 to 64%, 57 to 62%),
- Al 2 O 3 5 to 20% (9 to 18%, 12 to 17%),
- the following composition may be included as an optional component.
- SiO 2 50 to 70%
- Al 2 O 3 5 to 20%
- CaO: 0-20% It is preferable to contain.
- a clarifier can be added as a component for defoaming bubbles in the glass.
- the fining agent is not particularly limited as long as it has a small environmental burden and excellent glass fining properties.
- a metal oxide such as tin oxide, iron oxide, cerium oxide, terbium oxide, molybdenum oxide and tungsten oxide. There may be mentioned at least one selected.
- Sb 2 O 3 and PbO are substances having an effect of clarifying the glass by causing a reaction with valence fluctuation in the molten glass, but As 2 O 3 and PbO have an environmental burden. Since it is a large substance, the glass plate of this embodiment does not substantially contain As 2 O 3 and PbO in the glass. In the present embodiment, “substantially not containing As 2 O 3 and PbO” means that the content is less than 0.01% by mass and is not intentionally contained except for impurities.
- the molten glass needs to be 1600 ° C. or higher (for example, 1620 ° C. or higher). This is because the tin oxide does not release oxygen violently unless the temperature is 1600 ° C. or higher (for example, 1620 ° C. or higher).
- a current is passed directly to a platinum group element or a platinum group element alloy constituting the clarification tank 102 or a pipe provided downstream of the melting tank 101. .
- the temperature of piping or the clarification tank 102 is raised to 1600 degreeC or more (for example, 1620 degreeC or more), and the molten glass in piping or the clarification tank 102 is heated to the temperature suitable for clarification. That is, in the manufacture of a glass plate that uses tin oxide as a fining agent, the temperature of the fining tank 102 and the surrounding piping is higher than that of a glass plate that uses As 2 O 3 as a fining agent. Therefore, there is a problem that the amount of expansion of the clarification tank 102 and the surrounding pipes increases, and the damage and deformation of the pipes become remarkable. Therefore, the effect of the present invention becomes more prominent in the case of glass that is clarified using tin oxide.
- flat panel displays require display elements that use P-Si (low-temperature polysilicon) TFTs and oxide semiconductors instead of ⁇ -Si (amorphous silicon) TFTs in order to achieve higher definition in recent years. It has been.
- P-Si (low-temperature polysilicon) TFT and the oxide semiconductor heat treatment at a higher temperature is performed than in the process of forming the ⁇ -Si TFT. Therefore, a glass plate on which P-Si (low-temperature polysilicon) TFT and an oxide semiconductor are formed is required to have a low thermal shrinkage rate. In order to reduce the thermal shrinkage rate, it is preferable to increase the strain point of the glass.
- the production method of the present invention is suitable for producing a glass plate for flat panel display using P-Si • TFT, because the temperature of the molten glass is increased as compared with the prior art.
- the present invention is suitable for manufacturing a glass plate for a flat panel display using an oxide semiconductor.
- the present invention is suitable for producing a glass plate using a molten glass having a strain point of 655 ° C.
- the present invention is suitable for manufacturing a glass plate having a strain point of 675 ° C. or higher, which is more suitable for forming a P-Si (low temperature polysilicon) TFT or an oxide semiconductor, and manufacturing a glass plate having a strain point of 680 ° C. or higher. And more suitable for the production of a glass plate having a strain point of 690 ° C. or higher.
- the glass plate is mass% display and the glass plate containing the following components is illustrated, for example.
- the mass ratio (SiO 2 + Al 2 O 3 ) / B 2 O 3 is in the range of 7 to 20, Is a glass plate.
- the mass ratio (SiO 2 + Al 2 O 3 ) / B 2 O 3 is preferably 7.5 or more.
- R 2 O (where R 2 O is the total amount of components contained in Li 2 O, Na 2 O and K 2 O so that current does not flow through the melting tank 102 instead of molten glass during melting) ) Is preferably included in an amount of 0.01 to 0.8% by mass to reduce the specific resistance of the molten glass. Alternatively, it is also preferable to contain 0.01 to 1.0% by mass of Fe 2 O 3 in order to reduce the specific resistance of the molten glass. Further, CaO / RO is preferably 0.65 or more in order to prevent the devitrification temperature from increasing while realizing a high strain point. By setting the devitrification temperature to 1250 ° C. or less, the overflow downdraw method can be applied. When applied to mobile devices such as mobile communication terminals, the total content of SrO and BaO is preferably 0 to less than 2% by mass from the viewpoint of weight reduction.
- a glass plate is used for a display part of a flat panel display such as a liquid crystal display.
- the glass plate is formed by processing a sheet-like sheet glass.
- Sheet glass is molded by melting the prepared raw material in a melting tank to become molten glass, and the molten glass is poured into a molding apparatus through a clarification tank that removes bubbles, a stirring tank that makes the composition distribution uniform, and the like. Is done.
- platinum or a platinum alloy-made one is used for an apparatus or piping through which the molten glass flows. This is for the purpose of preventing the molten glass from being contaminated by melting the materials constituting the apparatus and piping, and the purpose of adjusting the temperature of the molten glass flowing inside by flowing electricity to the apparatus and the piping itself, etc. There is.
- the molten glass flowing through the piping during operation is at a high temperature of about 1000 ° C. to 1700 ° C.
- Patent Document 1 Patent No. 4498390
- the outer and inner walls of the pipe through which the molten glass flows are radially arranged.
- the bulging part which bulges is formed in the surrounding part at the spiral.
- Patent Document 1 Patent No. 4498390
- piping for conveying molten glass is often divided into a plurality of parts.
- thermal expansion corresponding to the temperature difference occurs in these and peripheral members. That is, in such a case, it is considered that thermal expansion and thermal distortion occur in the piping, apparatus, and peripheral members for conveying the molten glass, and it is considered that deformation and damage are caused by the thermal expansion and thermal distortion. It is.
- Patent Document 1 Japanese Patent No. 4498390
- the temperature of the pipes for transporting the molten glass is increased to a predetermined temperature before being connected by welding or the like to the operating state. Conceivable.
- the piping is heated up to a predetermined temperature in advance before connection and the like are performed to bring it into the operating state.
- the upper limit temperature is 1000 ° C. to 1200 ° C. in consideration of the workability of the worker, and the temperature is raised to the operating temperature (for example, 1500 ° C.) Have difficulty.
- the temperature of the pipe is raised to a predetermined temperature in advance in order to suppress deformation and breakage due to thermal expansion, the temperature is further raised to the temperature during operation after the pipe is brought into the operating state. For this reason, thermal expansion of the piping still occurs, and there is a concern that the piping may be deformed or damaged. More specifically, it is considered that deformation or breakage of the pipe occurs due to stress concentration in a welding region where a plurality of pipes are connected, or in a place where the temperature is higher and the strength is weakened.
- Patent Document 1 sufficiently suppresses damage and deformation of the pipes. Have difficulty.
- the first pipe 111 and the second pipe 112 can be connected by covering the pipes 111 and 112 and the first space S1 between the pipes 111 and 112 with the covering member 113. That is, the pipe through which the molten glass flows, that is, the first pipe 105 can be brought into an operating state by a simple operation.
- both the first tube 111 and the second tube 112 are fixed at one end but not fixed at the other end.
- the covering member 113 is made of the same member as the first tube 111 and the second tube 112. Therefore, in consideration of the thermal expansion of the pipe, it is not necessary to bring the pipe up to a predetermined temperature before the operation state. That is, since the first pipe 105 can be brought into an operating state at room temperature, the work efficiency is improved and the work accuracy is also improved.
- the welded portions such as a plurality of members tend to have low strength.
- the pipes 111 and 112 and the first space S1 between the pipes 111 and 112 are formed.
- the first tube 111 and the second tube 112 can be indirectly connected by covering with the covering member 113. Therefore, it can be said that it is preferable also from the viewpoint of strength.
- Patent Document 1 Japanese Patent No. 4498390
- one end of a pipe is connected to a stirrer and the other end is connected to another pipe. That is, both ends of the pipe are in a fixed state. Therefore, thermal expansion occurs when high-temperature molten glass flows inside, so even if the bulging portion that bulges radially in the outer wall and inner wall of the pipe is formed in a spiral shape in the peripheral portion, it is still in the longitudinal direction. There is a concern that compressive stress is applied.
- both the first tube 111 and the second tube 112 are fixed at one end but not fixed at the other end.
- a first space S1 exists between the first tube 111 and the second tube 112. Therefore, in the operating state, even if high-temperature molten glass flows through the first pipe 105 and thermal expansion occurs in the direction in which the first pipe 111 and the second pipe 112 approach each other, a compressive stress in the longitudinal direction is generated. Hateful. That is, since the first pipe 111 and the second pipe 112 are free at one end, the first pipe 111 and the second pipe 112 themselves may be damaged even if contraction or expansion occurs due to a change in temperature during operation. This is reduced.
- the first space S1 functions as a thermal expansion allowable space that allows thermal expansion of the first pipe 111 and the second pipe 112 during operation. Therefore, deformation and breakage of the first pipe 105 through which the molten glass flows can be suppressed.
- this inventor manufactured the glass plate of the longitudinal direction 1870mm, the width direction 2200mm, and thickness 0.7mm using the manufacturing method and the glass plate manufacturing apparatus 100 of a glass plate as described in this embodiment.
- the content rate (mass%) of each component contained in the molten glass at this time is as follows.
- the present invention has proved useful for suppressing deformation and breakage of the glass plate manufacturing apparatus 100.
- the covering member 113 that covers the end portions of the first tube 111 and the second tube 112 and the first space S1 between the first tube 111 and the second tube 112 has a plurality of members, that is, It has the 1st member 113a and the 2nd member 113b. Thereby, the attaching operation
- the first member 113a and the second member 113b include cover portions 213a and 214a and flange portions 213b, 213c, 214b, and 214c, respectively.
- the flange portion 213b of the first member 113a and the flange portion 213b of the second member 113b, and the flange portion 213c of the first member 113a and the flange portion 214c of the second member 113b respectively.
- a space S4 between the flange portions is formed.
- the viscosity of the molten glass is increased in the inter-flange space S4. That is, the flange portions 213b, 213c, 214b, and 214c are provided so that the molten glass leaking from the gap S2 or the gap S3 is likely to increase in viscosity.
- the molten glass whose viscosity has increased plays a role in suppressing the molten glass flowing inside the first tube 111 and the second tube 112 from leaking outside the first tube 111 and the second tube 112.
- the molten glass having an increased viscosity also serves to bond the first member 113a and the second member 113b. Thereby, it becomes easy to adhere
- the molten glass By making the molten glass have a function as an adhesive using the increase in viscosity of the molten glass, the first member 113a and the second member 113b need not be welded. Therefore, working efficiency is improved.
- the reason why the viscosity of the molten glass in the inter-flange space S4 is likely to increase in viscosity is that the inter-flange space S4 is not covered with the heat insulating material and is easily affected by the outside air. That is, the temperature is unlikely to rise compared to the inside of the first tube 111 and the second tube 112. Further, since the amount of heat transferred from the molten glass flowing inside the first tube 111 and the second tube 112 is also small, the temperature is unlikely to rise even compared to the gap S2 and the gap S3.
- the temperature of the molten glass flows through the first pipe 111 and the second pipe 112, and the temperature of the molten glass in the gaps S2 and S3. It becomes the structure which can adjust heat
- the first pipe 105 of the present embodiment heats the gaps S2 and S3 so that the temperature of the molten glass is lower than the temperature of the molten glass flowing inside the first pipe 111 and the second pipe 112. It can be adjusted. That is, in the transporting process of transporting the molten glass from the first pipe 111 to the second pipe 112 via the first space S1, the viscosity of the molten glass is increased (viscosity increasing process).
- the molten glass that has entered the gaps S2 and S3 (that is, the molten glass that has entered between the end of the first tube 111 on the second tube 112 side and the covering member 113 and the first tube 111 of the second tube 112).
- log ⁇ 6 to 13
- the viscosity since the covering member 113 has the flange portions 213b, 213c, 214b, and 214c, the viscosity may be lower than the above.
- the covering member 113 is pressed by the pressing member 114. Specifically, the first member 113a and the second member 113b are pressed in a direction approaching each other by the first pressing member 114a and the second pressing member 114b, respectively.
- the first member 113a and the second member 113b can be fixed by a simple method by pressing the covering member 113 with the pressing member 114. Therefore, working efficiency is improved.
- the pressing member 114 a member having a higher thermal conductivity than the heat insulating material disposed at the end portions of the first tube 111 and the second tube 112 that are not opposed to each other is used for the pressing member 114. Since the pressing member 114 is exposed to the outside air, it is easier to radiate heat than the heat insulating material. Therefore, the pressing member 114 has not only a role of pressing the covering member 113 but also a role of cooling the molten glass through the covering member 113.
- the pressing member 114 also has the function of the temperature adjustment device. Contributes to cost and energy saving. This effect becomes more prominent as the amount of MG increases. This is because as the amount of MG increases, the amount of heat retained by the molten glass increases, making it difficult to lower the temperature of the molten glass in the first pipe 105.
- FIG. 6 is a cross-sectional view of the first pipe 105 shown in FIG. 5 cut in a direction that passes through the first space S1 and is perpendicular to the first direction.
- illustration is abbreviate
- the first pipe 111 and the second pipe 112 can function as the first pipe 105 that conveys the molten glass by covering the covering member 113 in a separated state, and thus has been described above.
- the above problems can be reduced.
- the molten glass flowing inside the first tube 111 and the second tube 112 is utilized outside the covering member 113 as shown in FIG. Suppressing leakage. That is, even if the molten glass leaks to the outside of the first tube 111 and the second tube 112, it is configured to make use of it.
- the glass plate for flat panel display glass containing a trace amount of alkali or non-alkali glass is used from the viewpoint of suppressing the destruction of TFT, and tin oxide is used from the viewpoint of reducing environmental burden. For this reason, in at least the clarification process of the production of the glass plate, the clarification of the molten glass is efficiently performed, so that the temperature of the molten glass is adjusted to be higher than the conventional one.
- a glass composition having a high strain point is used because a glass plate with a low thermal shrinkage rate is desired to achieve a high-definition flat panel display. At this time, in a glass composition having a high strain point, the viscosity at high temperature (high temperature viscosity) becomes high.
- the manufacturing method of the present invention capable of suppressing deformation and breakage of the piping around the clarification tank 102 through which the molten glass flows can efficiently manufacture a glass plate against the high temperature of the molten glass required in the clarification step. Effective in terms.
- the plurality of pipes are covered with the covering member.
- 113 and the holding member 114 can be indirectly connected using a member having the same configuration and function. Thereby, even a pipe longer than the first pipe 105 can be formed.
- FIG. 7 shows a case where three tubes 310, 320, and 330 that are separated from each other are indirectly connected using a covering member 413.
- the covering member 413 has the same configuration and function as the covering member 113.
- first member 113a and the second member 113b have been described as having two flange portions 213b, 213c, 214b, and 214c, respectively, but the number is not limited to two, and at least 1 It suffices to have a flange portion.
- the flange portions 213b, 213c, 214b, and 214c have been described as extending in the horizontal direction outward from both ends of the cover portions 213a and 214a, respectively.
- the positions where the flange portions 213b, 213c, 214b, and 214c are provided are not particularly limited, and may be provided so as to extend outward with respect to the first tube 111 and the second tube 112.
- the first member 113a and the second member 113b have been described as having the flange portions 213b, 213c, 214b, and 214c.
- the flange portions 213b, 213c, 214b, and 214c are not essential components. Also good.
- the material of the pressing member 114 may be selected from materials having high thermal conductivity and easy to cool, or the first pressing member 114a and the second pressing member. A joint portion with the member 114b may be cooled.
- the width W1 of the flange parts 213b and 213c demonstrated that 20 mm or less was preferable.
- the widths of the first lower surface 414 and the second lower surface 415 of the first pressing member 114a and the second pressing member 114b are respectively the flange portions 213b and 213c of the first member 113a and the flange portions 214b and 214c of the second member 113b. It has been described that it is preferable that the width is the same as the width. However, it is not limited to this.
- the width W1 of the flange portions 213b and 213c and the width of the flange portions 214b and 214c may be larger than those in the above embodiment, or may be larger than the widths of the first lower surface 414 and the second lower surface 415. Each may also be enlarged.
- a material having a relatively high heat insulating property is used for the first pressing member 114a and the second pressing member 114b. This is a case where the temperatures of the flange portions 213b and 213c of the first member 113a and the flange portions 214b and 214c of the second member 113b are excessively increased.
- the width, the material and dimensions of the pressing member 114, and the like can be changed.
- the flange portion space S4 exists between the first member 113a and the second member 113b.
- the present invention is not limited to this, and the first member 113a and the second member 113b are You may touch. That is, the flange portion space S4 may not be formed.
- An example of this case is shown in FIG. In this case, for example, if the arc portion of the cover portion 213a of the first member 113a and / or the cover portion 214a of the second member 113b is formed long, the space S4 between the flange portions is not formed while forming the gap S2 and the gap S3. Can be.
- the flange portions 213b and 213c of the first member 113a and the flange portions 214b and 214c of the second member 113b come into contact with each other.
- the first member 113a and the first member 113a disposed above the first pipe 111 and the second pipe 112 are used.
- the pressing member 114a may not be supported by the support member. In this case, it is possible to further contribute to cost saving and improvement of work efficiency.
- the first member 113a and the second member 113b can be connected by welding or the like.
- the strength of the first pipe 105 can be improved by connecting the flange portions 213b and 213c of the first member 113a and the flange portions 214b and 214c of the second member 113b by welding or the like.
- welding or the like between the first member 113a and the second member 113b can be performed before the temperature of the first pipe 105 is raised, so that work efficiency and work accuracy can be improved.
- the viscosity of the molten glass flowing outside from the first tube 111 and the second tube 112 tends to increase in the vicinity of the flange portions 213b, 213c, 214b, and 214c.
- the gaps S2 and S3 exist between the covering member 113 and the first pipe 111 and the second pipe 112, respectively, but the present invention is not limited to this.
- only the gap S3 may be formed, or neither of the gaps S2 and S3 may be formed.
- the inner diameter of the first member 113a and the outer diameters of the first pipe 111 and the second pipe 112 are the same.
- the first member 113a is attached to the first tube 111 and the second tube 112 so that the inner periphery of the cover portion 213a contacts the outer periphery of the first tube 111 and the second tube 112. Leakage of molten glass to the outside of the first tube 111 and the second tube 112 can be further suppressed.
- the inner periphery of the first member 113a and the second member 113b is in contact with the outer periphery of the first tube 111 and the second tube 112.
- the temperature of the molten glass flowing in the first tube 111 and the second tube 112 is high, This is effective when it is desired to minimize the cooling in this portion.
- the cross-sectional shape of the covering member 113 cut in the direction perpendicular to the first direction approaches a substantially perfect circle, for example, compared to the case where the cross-sectional shape is elliptical, the molten glass is heated uniformly. It becomes easy to conduct.
- the covering member 113 may be a single pipe in which a cavity is formed.
- the first pipe 111 or the second pipe 112 is first inserted into the pipe, and the first pipe 105 is then slid to the other pipe 111 or 112 side. Can be formed.
- the covering member 113 basically covers almost the entire circumference of the first pipe 111 and the second pipe 112, but is not limited thereto.
- the molten glass flowing inside the first tube 111 has a shape capable of exhibiting a function of flowing inside the second tube 112.
- the stirring tank 103 and the second pipe 112 are described as being connected, but the present invention is not limited to this.
- the second pipe 112 has a flange portion (not shown) at the end on the stirring tank 103 side, the flange portion of the second pipe 112 is joined to the wall surface of the stirring tank 103 by welding or the like.
- the connection method with an apparatus is not specifically limited also regarding between others.
- the temperature of the molten glass that has entered the space S4 between the flanges may be lowered to a viscosity that does not cause viscous flow.
- the molten glass is solidified by cooling in the vicinity of the outer portions of the flange portions 213b, 213c, 214b, and 214c. As described above, leakage of molten glass from the inter-flange space S4 can be suppressed. This is because the thermal conductivity of the pressing member 114 is higher than that of the heat insulating material.
- the cover member 113 has a configuration in which two openings 313 are formed.
- the present invention is not limited to this, and a configuration in which at least one opening 313 is formed is adopted. May be.
- the present invention can be applied to various methods and various apparatuses for manufacturing a glass plate using piping through which high-temperature molten glass flows.
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Abstract
Description
さらに、近年は環境負荷の問題から、清澄剤として高い清澄効果は得られるものの毒性の高いAs2O3ではなく、酸化スズや酸化鉄等の金属酸化物を適用することが求められている。ここで、酸化スズや酸化鉄等を清澄剤として機能させるためには、As2O3と比較して溶融ガラスの温度をさらに上昇させる必要がある。より詳細には、酸化スズが清澄剤として機能し始める温度は、As2O3よりも高い。つまり、清澄剤として酸化スズなどを含有させたガラス板の製造においては、清澄槽やその周辺の配管の温度もAs2O3を清澄剤として含有した場合よりも高くする必要がある。このため、清澄槽やその周辺の配管の膨張量が増加し、配管の破損や変形が顕著になるという問題がある。 In recent years, the demand for defects due to bubbles in glass plates used in electrical products such as flat panel displays has become stricter, and it has become necessary to reduce the number of bubbles in glass plates using fining agents. ing.
Furthermore, in recent years, due to the problem of environmental burden, it is required to apply metal oxides such as tin oxide and iron oxide instead of highly toxic As 2 O 3 although a high clarification effect can be obtained as a clarifier. Here, in order to function tin oxide and iron oxide as a refining agent, it is necessary to further increase the temperature of the molten glass in comparison with the As 2 O 3. More specifically, the temperature at which tin oxide begins to function as a fining agent is higher than As 2 O 3 . That is, in the production of a glass plate containing tin oxide or the like as a fining agent, the temperature of the fining tank or the surrounding pipes needs to be higher than when As 2 O 3 is contained as a fining agent. For this reason, there is a problem that the amount of expansion of the clarification tank and the surrounding piping increases, and the damage and deformation of the piping become remarkable.
図1は、本実施形態に係るガラス板の製造方法の一部のフローチャートである。以下、図1を用いてガラス板の製造方法について説明する。 (1) Outline of Glass Plate Manufacturing Method FIG. 1 is a partial flowchart of the glass plate manufacturing method according to the present embodiment. Hereinafter, the manufacturing method of a glass plate is demonstrated using FIG.
図2は、本実施形態に係るガラス板製造装置100の一例を示したものである。 (2) Outline of Glass
なお、白金族元素又は白金族元素合金からなる清澄槽102、第1配管105、攪拌槽103、第2配管106は、当該白金族元素又は白金族元素合金に直接電流を流すことで加熱されることが好ましい。白金族元素又は白金族元素合金に直接電流を流して加熱することで、効率よく溶融ガラスを昇温させることができる。このため、清澄剤として酸化スズを用いた場合であっても、酸化スズが清澄剤として効果的に機能する温度(例えば1620℃以上に)に溶融ガラスを容易に昇温させることができる。
なお、清澄槽102、第1配管105、攪拌槽103、第2配管106の加熱方法は上記方法に限定されず、例えば、清澄槽102、第1配管105、攪拌槽103、第2配管106の周囲に電気ヒータなどの加熱装置を設置し、当該加熱装置によって加熱することも可能である。 The
The
In addition, the heating method of the
図3は、第1配管105の概略分解斜視図である。 (3) Detailed Configuration of
図4は、覆い部材113及び押さえ部材114の概略斜視図である。 (4) Detailed Configuration of Pressing
以下、第1配管105及び押さえ部材114の取付方法について説明する。 (5) Method for Attaching
本発明を用いて製造されるガラス板の例を以下に説明する。なお、下記の形態に限られるものではない。 (6) Example of glass plate manufactured using this invention The example of the glass plate manufactured using this invention is demonstrated below. Note that the present invention is not limited to the following form.
SiO2:50~70%(55~65%,57~64%、58~62%)、
Al2O3:5~25%(10~20%,12~18%,15~18%)、
B2O3:0~15%(5~15%,6~13%,7~12%)。 Moreover, as a glass plate for flat panel displays (a liquid crystal display, a plasma display, etc.), the glass plate is a mass% display and includes the following components. The indication in the following parentheses is the preferable content of each component, and the latter half is more preferable.
SiO 2 : 50 to 70% (55 to 65%, 57 to 64%, 58 to 62%),
Al 2 O 3 : 5 to 25% (10 to 20%, 12 to 18%, 15 to 18%),
B 2 O 3 : 0 to 15% (5 to 15%, 6 to 13%, 7 to 12%).
MgO:0~10%(下限は0.01%、下限は0.5%、上限は5%、上限は4%、上限は2%)、
CaO:0~20%(下限は1%、下限は3%、下限は4%、上限は9%、上限は8%、上限は7%、上限は6%)、
SrO:0~20%(下限は0.5%、下限は3%、上限は9%、上限は8%、上限は7%、上限は6%)、
BaO:0~10%(上限は8%、上限は3%、上限は1%、上限は0.2%)、
ZrO2:0~10%(0~5%,0~4%,0~1%,0~0.1%)。 At this time, the following composition may be included as an optional component.
MgO: 0 to 10% (lower limit is 0.01%, lower limit is 0.5%, upper limit is 5%, upper limit is 4%, upper limit is 2%),
CaO: 0 to 20% (lower limit is 1%, lower limit is 3%, lower limit is 4%, upper limit is 9%, upper limit is 8%, upper limit is 7%, upper limit is 6%),
SrO: 0 to 20% (lower limit is 0.5%, lower limit is 3%, upper limit is 9%, upper limit is 8%, upper limit is 7%, upper limit is 6%),
BaO: 0 to 10% (upper limit is 8%, upper limit is 3%, upper limit is 1%, upper limit is 0.2%),
ZrO 2 : 0 to 10% (0 to 5%, 0 to 4%, 0 to 1%, 0 to 0.1%).
SiO2:50~70%、
B2O3:5~18%、
Al2O3:10~25%、
MgO:0~10%、
CaO:0~20%、
SrO:0~20%、
BaO:0~10%、
RO:5~20%(但し、RはMg、Ca、Sr及びBaから選ばれる少なくとも1種である)、
を含有することが好ましい。さらに、
R’2O:0.2%を超え2.0%以下(但し、R’はLi、Na及びKから選ばれるガラス板に含有される成分であって、少なくとも1種である)、を含むことが好ましい。
このときのガラス組成のガラスは、アルカリ微量含有ガラスといい、このガラス組成のガラス板をアルカリ微量含有ガラス板という。アルカリ微量含有ガラスは、R’2Oの含有率が0%を超え2.0%以下であればよい。本実施形態においてR’2Oの含有率が0%を超え2.0%以下のアルカリ微量含有ガラスが用いられ得るが、好ましくは0.2%を超え2.0%以下である。また、R’2Oが実質0.0%であってもよい。このときのガラス組成のガラスを無アルカリガラスといい、このガラス組成のガラス板を無アルカリガラス板という。
また、清澄剤を合計で0.05~1.5%含み、As2O3及びPbOを実質的に含まないことが好ましい。また、ガラス中の酸化鉄の含有量が0.01~0.2%であることがさらに好ましい。 Further, in particular, the glass plate is represented by the following mass%,
SiO 2 : 50 to 70%,
B 2 O 3 : 5 to 18%,
Al 2 O 3 : 10 to 25%,
MgO: 0 to 10%,
CaO: 0-20%,
SrO: 0 to 20%,
BaO: 0 to 10%,
RO: 5 to 20% (provided that R is at least one selected from Mg, Ca, Sr and Ba),
It is preferable to contain. further,
R ′ 2 O: more than 0.2% and 2.0% or less (provided that R ′ is a component contained in a glass plate selected from Li, Na and K, and is at least one kind). It is preferable.
The glass having a glass composition at this time is referred to as an alkali trace-containing glass, and the glass plate having this glass composition is referred to as an alkali trace-containing glass plate. The alkali trace glass may have a content of R ′ 2 O exceeding 0% and not more than 2.0%. In the present embodiment, an alkali trace glass having a content of R ′ 2 O of more than 0% and not more than 2.0% can be used, but preferably more than 0.2% and not more than 2.0%. Further, R ′ 2 O may be substantially 0.0%. The glass having a glass composition at this time is called non-alkali glass, and the glass plate having this glass composition is called an alkali-free glass plate.
Further, it is preferable that the total amount of fining agents is 0.05 to 1.5% and substantially free of As 2 O 3 and PbO. More preferably, the iron oxide content in the glass is 0.01 to 0.2%.
SiO2:50~70%、
B2O3:0~15%、
Al2O3:5~25%、
MgO:0~10%、
CaO:0~20%、
SrO:0~20%、
BaO:0~10%、
RO:5~20% (但し、RはMg、Ca、Sr及びBaから選ばれる前記ガラス板に含有される成分であり、少なくとも1種である)、
を含有することが好ましい。
さらに、製造されるガラス板が、TFT(Thin Film Transistor)を使用したフラットパネルディスプレイ(液晶ディスプレイや有機ELディスプレイ等)に用いるガラス板の場合、TFTの破壊を抑制する観点から、本実施形態で製造されるガラス板は無アルカリガラス板であることが好ましい。他方、ガラスの熔解性を無アルカリガラスに比べて向上させるために、本実施形態で製造されるガラス板はあえてアルカリ成分を微量含有させるアルカリ微量含有ガラス板であってもよい。ガラス板からアルカリ金属酸化物が溶出した場合、TFTを破壊するおそれがあることから、無アルカリガラス板あるいはアルカリ微量含有ガラス板がTFTを使用するフラットパネルディスプレイ用に好適に用いられる。
アルカリ微量含有ガラス板の場合、アルカリ金属酸化物R’2Oは、質量%表示で0.05%を超え2.0%以下、より好ましくはR’2Oは0.1%を超え1.0%以下(但し、R’は、Li、Na及びKから選ばれるガラス板に含有される成分であり、少なくとも1種である)を含むことが好ましい。また、清澄剤を合計で0.05%~1.5%含み(質量%表示)、AS2O3及びPbOを実質的に含まないことが好ましい。また、ガラス組成中の酸化鉄の含有量は質量%表示で0.01%~0.2%であることがさらに好ましい。
なお、近年フラットパネルディスプレイは軽量化が求められているため、フラットパネルディスプレイ用ガラス板の場合、SrO+BaOが質量%表示で0~10%であることが好ましい。また、軽量化の観点に加え、環境負荷を考慮するとBaOは質量%表示で0~2%であることがさらに好ましい。 In addition, the glass plate is represented by the following mass%,
SiO 2 : 50 to 70%,
B 2 O 3 : 0 to 15%,
Al 2 O 3 : 5 to 25%,
MgO: 0 to 10%,
CaO: 0-20%,
SrO: 0 to 20%,
BaO: 0 to 10%,
RO: 5 to 20% (provided that R is a component contained in the glass plate selected from Mg, Ca, Sr and Ba, and is at least one kind)
It is preferable to contain.
Furthermore, in the case where the glass plate to be manufactured is a glass plate used for a flat panel display (such as a liquid crystal display or an organic EL display) using a TFT (Thin Film Transistor), from the viewpoint of suppressing the destruction of the TFT, The glass plate to be produced is preferably an alkali-free glass plate. On the other hand, in order to improve the meltability of the glass as compared with the alkali-free glass, the glass plate produced in the present embodiment may be a glass plate containing a trace amount of alkali that dares to contain a trace amount of an alkali component. When the alkali metal oxide is eluted from the glass plate, the TFT may be destroyed. Therefore, an alkali-free glass plate or a glass plate containing a trace amount of alkali is suitably used for a flat panel display using the TFT.
In the case of a glass plate containing a trace amount of alkali, the alkali metal oxide R ′ 2 O is more than 0.05% and not more than 2.0% in terms of mass%, more preferably R ′ 2 O is more than 0.1% and 1. It is preferable that it contains 0% or less (provided that R ′ is a component contained in a glass plate selected from Li, Na and K and is at least one kind). Further, it is preferable that 0.05 to 1.5% of the refining agent is contained in total (expressed by mass%), and AS 2 O 3 and PbO are not substantially contained. The content of iron oxide in the glass composition is more preferably 0.01% to 0.2% in terms of mass%.
In recent years, since flat panel displays have been required to be lighter, in the case of a glass plate for flat panel displays, SrO + BaO is preferably 0 to 10% in terms of mass%. Further, considering the environmental load in addition to the weight reduction, BaO is more preferably 0 to 2% in terms of mass%.
より具体的には、清澄工程では、溶融ガラス中の泡が浮上する速度は溶融ガラスの粘度の影響を受け、溶融ガラスの粘度が低いほど泡の浮上速度は上昇する。このため、無アルカリガラスあるいはアルカリ微量含有ガラスの清澄を行うためには、溶融ガラスの粘度を清澄に適した粘度である200~800poiseとする。上述したように、アルカリ微量含有ガラス板あるいは無アルカリガラス板の熔解解性は低いので、無アルカリガラスあるいはアルカリ微量含有ガラスの場合、アルカリ含有ガラスと比較して溶融ガラスの温度をさらに上昇させる必要がある。より詳細には、無アルカリガラス板あるいはアルカリ微量含有ガラス板の製造では、清澄工程において、溶融ガラスの温度を酸化スズが清澄剤として機能し始める温度よりもさらに高温(例えば1620℃以上、より好ましくは1650℃以上、さらにより好ましくは1680℃以上)にする必要がある。つまり、溶解槽101の下流側に設けられた清澄槽102の温度を、例えば1640℃以上に上昇させ、これにより溶融ガラスを例えば1620℃以上、より好ましくは1650℃、さらにより好ましくは、1680℃以上に加熱する。
また、溶解槽101においてガラス原料が溶解された溶融ガラスは、清澄槽102以降成形装置104に供給されるまで高い温度(例えば、1200~1600℃)に保たれる必要がある。このため、無アルカリガラス板あるいはアルカリ微量含有ガラス板の製造では、高温の溶融ガラスが流れる装置(具体的には、溶解槽、清澄槽、攪拌槽、及び、成形装置)や配管(具体的には、第1配管や第2配管)の膨張量が大きくなることが想定される。よって、これらの装置や配管の破損が生じやすくなる。従って、SiO2やAl2O3の含有量が多く、アルカリ金属酸化物(Li2O、Na2O、K2O)の含有量が少ないあるいは全く含有しないフラットパネルディスプレイ用のガラス板を製造する際には、本発明の効果が顕著となる。例えば、SiO2+Al2O3の含有量が70質量%以上(例えば70質量%~95質量%)、かつアルカリ金属酸化物(Li2O、Na2O、K2O)の含有量が2質量%以下(例えば0~2質量%以下)であるガラス板に、本発明は好適である。また、SiO2+Al2O3の含有量が70質量%以上(例えば70質量%~95質量%)、かつアルカリ金属酸化物(Li2O、Na2O、K2O)の含有量が1質量%以下(例えば0~1質量%)であるガラス板に、本発明はさらに好適である。また、SiO2+Al2O3の含有量が75質量%以上(例えば75質量%~95質量%)、かつアルカリ金属酸化物(Li2O、Na2O、K2O)の含有量が0.5質量%以下(0~0.5質量%)であるガラス板に、本発明はさらに好適である。
なお、上述したように、粘度ηにおいてlogη=2.5となる温度が1500~1750℃である溶融ガラスは、清澄槽102において十分な泡の浮上速度を得るために、例えば、溶融ガラスの温度を例えば1620℃以上にする必要がある。したがって、上記溶融ガラスは、従来のアルカリ含有ガラスに比べて、清澄槽102を構成する白金族元素又は白金族元素合金の膨張量が増加する。つまり、logη=2.5となる温度が1500~1750℃の溶融ガラスは、白金族元素又は白金族元素合金の膨張が大きくなり易い。このため、上記溶融ガラスは、本実施形態の製造方法に好適である。ガラスの粘度については、好ましくは、logη=2.5となる温度は1530℃~1750℃であり、より好ましくは1550℃~1750℃であり、より一層好ましくは、1570℃~1750℃である。 Here, the glass plate for flat panel display has a large content of SiO 2 and Al 2 O 3 as described above, and a content of alkali metal oxides (Li 2 O, Na 2 O, K 2 O). A small amount of alkali-containing glass plate or non-alkali glass plate is preferably used as described above. However, the meltability of the alkali trace-containing glass plate or the alkali-free glass plate is low. Specifically, the temperature at which log η = 2.5 in the viscosity η of the molten glass is 1500 ° C. to 1750 ° C., which is higher than that of the alkali-containing glass. The molten glass having such a viscosity needs to raise the temperature of the
More specifically, in the clarification step, the speed at which the bubbles in the molten glass float is affected by the viscosity of the molten glass, and the foam floating speed increases as the viscosity of the molten glass decreases. For this reason, in order to clarify the alkali-free glass or the alkali-containing glass, the viscosity of the molten glass is set to 200 to 800 poise which is a viscosity suitable for fining. As described above, the melting property of the alkali trace glass or alkali-free glass plate is low, so in the case of alkali-free glass or alkali trace glass, the temperature of the molten glass needs to be further increased compared to the alkali-containing glass. There is. More specifically, in the production of an alkali-free glass plate or a glass plate containing a trace amount of alkali, in the refining step, the temperature of the molten glass is higher than the temperature at which tin oxide begins to function as a refining agent (for example, 1620 ° C. or more, more preferably 1650 ° C. or higher, more preferably 1680 ° C. or higher). That is, the temperature of the
Further, the molten glass in which the glass raw material is melted in the
As described above, the molten glass having a viscosity η = log η = 2.5 at a viscosity η of 1500 to 1750 ° C. is obtained, for example, at a temperature of the molten glass in order to obtain a sufficient bubble rising speed in the
SiO2:50~70%(55~65%,57~64%,57~62%)、
Al2O3:5~20%(9~18%,12~17%)、
Na2O:6~30%(7~20%,8~18%,10~15%)。 Moreover, as a glass plate applied to a cover glass or a glass plate for solar cells, for example, a glass plate is represented by mass% and includes the following components. The indication in the following parentheses is the preferred content of each component.
SiO 2 : 50 to 70% (55 to 65%, 57 to 64%, 57 to 62%),
Al 2 O 3 : 5 to 20% (9 to 18%, 12 to 17%),
Na 2 O: 6-30% (7-20%, 8-18%, 10-15%).
Li2O:0~8%(0~6%,0~2%,0~0.6%,0~0.4%,0~0.2%)、
B2O3:0~5%(0~2%,0~1%,0~0.8%)、
K2O:0~10%(下限は1%、下限は2%、上限は6%、上限は5%、上限は4%)、
MgO:0~10%(下限は1%、下限は2%、下限は3%、下限は4%、上限は9%、上限は8%、上限は7%)、
CaO:0~20%(下限は0.1%、下限は1%、下限は2%、上限は10%、上限は5%、上限は4%、上限は3%)、
ZrO2:0~10%(0~5%、0~4%、0~1%、0~0.1%)。
特に、化学強化されるカバーガラスや太陽電池用ガラス板としては、質量%表示で、
SiO2:50~70%、
Al2O3:5~20%、
Na2O:6~30%,
K2O:0~10%、
MgO:0~10%、
CaO:0~20%、
を含有することが好ましい。 At this time, the following composition may be included as an optional component.
Li 2 O: 0 to 8% (0 to 6%, 0 to 2%, 0 to 0.6%, 0 to 0.4%, 0 to 0.2%),
B 2 O 3 : 0 to 5% (0 to 2%, 0 to 1%, 0 to 0.8%),
K 2 O: 0 to 10% (lower limit is 1%, lower limit is 2%, upper limit is 6%, upper limit is 5%, upper limit is 4%),
MgO: 0 to 10% (lower limit is 1%, lower limit is 2%, lower limit is 3%, lower limit is 4%, upper limit is 9%, upper limit is 8%, upper limit is 7%),
CaO: 0 to 20% (lower limit is 0.1%, lower limit is 1%, lower limit is 2%, upper limit is 10%, upper limit is 5%, upper limit is 4%, upper limit is 3%),
ZrO 2 : 0 to 10% (0 to 5%, 0 to 4%, 0 to 1%, 0 to 0.1%).
In particular, as a cover glass or solar cell glass plate that is chemically strengthened,
SiO 2 : 50 to 70%,
Al 2 O 3 : 5 to 20%,
Na 2 O: 6-30%,
K 2 O: 0 to 10%,
MgO: 0 to 10%,
CaO: 0-20%,
It is preferable to contain.
ここで、ガラス板が、フラットパネルディスプレイ用ガラス基板に用いられる場合、泡欠陥に対する要求が特に厳しい。このため、清澄剤としては、酸化スズ、酸化鉄、酸化セリウム、酸化テルピウム、酸化モリブデン及び酸化タングステンといった金属酸化物の中でも特に清澄効果の高い酸化スズを少なくとも含有することが好ましい。
酸化スズを用いて清澄を行う場合、清澄槽102において、例えば溶融ガラスを1600℃以上(例えば1620℃以上)にする必要がある。これは、1600℃以上(例えば1620℃以上)にしないと、酸化スズが酸素を激しく放出しないからである。溶融ガラスを1600℃以上(例えば1620℃以上)に加熱するためには、溶解槽101の下流側に設けられた配管や清澄槽102を構成する白金族元素又は白金族元素合金に直接電流を流す。これにより、配管や清澄槽102の温度を、1600℃以上(例えば1620℃以上)に上昇させ、配管や清澄槽102における溶融ガラスを清澄に適した温度まで加熱する。つまり、清澄剤として酸化スズを使用するガラス板の製造においては、清澄剤としAs2O3を使用するガラス板の製造と比較して、清澄槽102やその周辺の配管の温度が高くなる。そのため、清澄槽102やその周辺の配管の膨張量が増加し、配管の破損や変形が顕著になるという問題がある。したがって、本発明の効果は、酸化スズを用いて清澄を行うガラスの場合、より顕著となる。 Here, for example, in order to allow a metal oxide such as tin oxide or iron oxide to function as a fining agent, it is necessary to raise the temperature of the molten glass more than As 2 O 3 . Therefore, since it is necessary to also raise the temperature of the
Here, when a glass plate is used for the glass substrate for flat panel displays, the requirement for bubble defects is particularly severe. For this reason, as a clarifier, it is preferable to contain at least tin oxide having a particularly high clarification effect among metal oxides such as tin oxide, iron oxide, cerium oxide, terpium oxide, molybdenum oxide, and tungsten oxide.
When clarification is performed using tin oxide, in the
例えば、歪点が655℃以上であり、粘度ηにおいてlogη=2となる温度が1600℃以上となる溶融ガラスを用いたガラス板の製造には、本発明が好適となる。特に、本発明は、P-Si(低温ポリシリコン)・TFTや酸化物半導体形成により適した歪点が675℃以上のガラス板の製造に好適であり、歪点680℃以上のガラス板の製造にさらに好適であり、歪点690℃以上のガラス板の製造により一層好適である。なお、歪点が675℃以上のガラス板の組成としては、例えば、ガラス板が質量%表示で、以下の成分を含むガラス板が例示される。
SiO2:52~78%、
Al2O3:3~25%、
B2O3:3~15%,
RO(但し、ROはMgO、CaO、SrO、及びBaOの内含有する成分の合量):3~20%、
を含み、
質量比(SiO2+Al2O3)/B2O3が7~20の範囲、
であるガラス板。
さらに、歪点をより上昇させるために、質量比(SiO2+Al2O3)/B2O3は7.5以上であることが好ましい。さらに、歪点を上昇させるために、β-OH値を0.1~0.3mmとすることが好ましい。他方、溶解時に溶融ガラスではなく溶解槽102に電流が流れてしまわないように、R2O(但し、R2OはLi2O、Na2O及びK2Oのうち含有する成分の合量)を0.01~0.8質量%含ませて、溶融ガラスの比抵抗を低下させることが好ましい。あるいは、溶融ガラスの比抵抗を低下させるためにFe2O3を0.01~1.0質量%含むことも好ましい。さらに、高い歪点を実現しつつ失透温度の上昇を防止するためにCaO/ROは0.65以上とすることが好ましい。失透温度を1250℃以下とすることにより、オーバーフローダウンドロー法の適用が可能となる。また、モバイル通信端末のようなモバイル機器などに適用される場合、軽量化の観点からはSrO及びBaOの合計含有量が0~2質量%未満であることが好ましい。 Furthermore, flat panel displays require display elements that use P-Si (low-temperature polysilicon) TFTs and oxide semiconductors instead of α-Si (amorphous silicon) TFTs in order to achieve higher definition in recent years. It has been. Here, in the process of forming the P-Si (low-temperature polysilicon) TFT and the oxide semiconductor, heat treatment at a higher temperature is performed than in the process of forming the α-Si TFT. Therefore, a glass plate on which P-Si (low-temperature polysilicon) TFT and an oxide semiconductor are formed is required to have a low thermal shrinkage rate. In order to reduce the thermal shrinkage rate, it is preferable to increase the strain point of the glass. However, a glass having a high strain point tends to have a high viscosity at high temperature (high temperature viscosity). Therefore, in the
For example, the present invention is suitable for producing a glass plate using a molten glass having a strain point of 655 ° C. or higher and a temperature at which log η = 2 in the viscosity η is 1600 ° C. or higher. In particular, the present invention is suitable for manufacturing a glass plate having a strain point of 675 ° C. or higher, which is more suitable for forming a P-Si (low temperature polysilicon) TFT or an oxide semiconductor, and manufacturing a glass plate having a strain point of 680 ° C. or higher. And more suitable for the production of a glass plate having a strain point of 690 ° C. or higher. In addition, as a composition of a glass plate whose strain point is 675 degreeC or more, the glass plate is mass% display and the glass plate containing the following components is illustrated, for example.
SiO 2 : 52 to 78%,
Al 2 O 3 : 3 to 25%,
B 2 O 3 : 3 to 15%,
RO (however, RO is the total amount of components contained in MgO, CaO, SrO, and BaO): 3 to 20%,
Including
The mass ratio (SiO 2 + Al 2 O 3 ) / B 2 O 3 is in the range of 7 to 20,
Is a glass plate.
Furthermore, in order to further increase the strain point, the mass ratio (SiO 2 + Al 2 O 3 ) / B 2 O 3 is preferably 7.5 or more. Further, in order to increase the strain point, it is preferable to set the β-OH value to 0.1 to 0.3 mm. On the other hand, R 2 O (where R 2 O is the total amount of components contained in Li 2 O, Na 2 O and K 2 O so that current does not flow through the
(7-1)
従来、液晶ディスプレイ等のフラットパネルディスプレイの表示部には、ガラス板が使用される。ガラス板は、シート状のシートガラスが加工されていくことによって成形される。シートガラスは、調合された原料が溶解槽にて溶解されて溶融ガラスとなり、溶融ガラスが、気泡を取り除く清澄槽、組成分布を均一にする攪拌槽等を通って成形装置に流し込まれることによって成形される。 (7) Features (7-1)
Conventionally, a glass plate is used for a display part of a flat panel display such as a liquid crystal display. The glass plate is formed by processing a sheet-like sheet glass. Sheet glass is molded by melting the prepared raw material in a melting tank to become molten glass, and the molten glass is poured into a molding apparatus through a clarification tank that removes bubbles, a stirring tank that makes the composition distribution uniform, and the like. Is done.
Al2O3 19.5%
B2O3 10%
CaO 5%
SrO 5%
SnO2 0.5% SiO 2 60%
Al 2 O 3 19.5%
B 2 O 3 10%
CaO 5%
SrO 5%
SnO 2 0.5%
本実施形態では、第1管111及び第2管112の端部、及び、第1管111と第2管112との間の第1空間S1を覆う覆い部材113は、複数の部材、すなわち、第1部材113aと、第2部材113bとを有する。これにより、覆い部材113の、第1管111及び第2管112への取り付け作業が容易になる。 (7-2)
In the present embodiment, the covering
本実施形態では、第1部材113a及び第2部材113bは、それぞれ、覆い部213a,214aと、フランジ部213b,213c,214b,214cとを有する。そして、本実施形態では、第1部材113aのフランジ部213bと第2部材113bのフランジ部213bとによって、また、第1部材113aのフランジ部213cと第2部材113bのフランジ部214cとによって、それぞれ、フランジ部間空間S4が形成されている。 (7-3)
In the present embodiment, the
本実施形態では、溶融ガラスが第1管111及び第2管112を流れる操業状態において、覆い部材113と、第1管111及び第2管112との間には、隙間S2,S3が存在する。 (7-4)
In the present embodiment, in an operating state where the molten glass flows through the
本実施形態では、覆い部材113は、押さえ部材114によって押さえられている。具体的には、第1部材113a及び第2部材113bは、それぞれ、第1押さえ部材114a及び第2押さえ部材114bによって、互いに近付く方向に押さえられている。 (7-5)
In the present embodiment, the covering
一般に、清澄槽から攪拌槽までは、溶融ガラスの温度を下げることが好ましい。そして、清澄槽と攪拌槽とを接続する配管の近傍には、溶融ガラスの温度を間接的に調整するための温度調整装置を用いることが多い。 (7-6)
Generally, it is preferable to lower the temperature of the molten glass from the clarification tank to the stirring tank. And in the vicinity of piping which connects a clarification tank and a stirring tank, the temperature adjustment apparatus for adjusting the temperature of a molten glass indirectly is often used.
図6は、図5に示す第1配管105を、第1空間S1を通り第1方向に鉛直する方向に切断した場合の断面図である。なお、図6では、第1配管105の内部に存在する溶融ガラスについては図示を省略している。 (7-7)
FIG. 6 is a cross-sectional view of the
フラットパネルディスプレイ用ガラス板には、TFTの破壊を抑制する点から、アルカリ微量含有ガラスあるいは無アルカリガラスが用いられ、しかも、環境負荷低減の点から酸化スズが用いられる。このため、ガラス板の製造の少なくとも清澄工程では、溶融ガラスの清澄が効率よく行われるために、従来に比べて溶融ガラスの温度が高く調整される。しかも、高精細なフラットパネルディスプレイを達成するために熱収縮率を小さくするガラス板が望まれる点から、歪点が高いガラス組成が用いられる。このとき、歪点が高いガラス組成では、高温時の粘度(高温粘性)が高くなる。したがって、熱収縮率を小さくする場合においても、清澄工程における溶融ガラスの温度は、従来に比べて高く調整される。このように清澄工程において要求される溶融ガラスの高温化に対して、溶融ガラスが流れる清澄槽102の周りの配管の変形や破損を抑制できる本発明の製造方法は、効率よくガラス板を製造する点で有効である。 (7-8)
For the glass plate for flat panel display, glass containing a trace amount of alkali or non-alkali glass is used from the viewpoint of suppressing the destruction of TFT, and tin oxide is used from the viewpoint of reducing environmental burden. For this reason, in at least the clarification process of the production of the glass plate, the clarification of the molten glass is efficiently performed, so that the temperature of the molten glass is adjusted to be higher than the conventional one. In addition, a glass composition having a high strain point is used because a glass plate with a low thermal shrinkage rate is desired to achieve a high-definition flat panel display. At this time, in a glass composition having a high strain point, the viscosity at high temperature (high temperature viscosity) becomes high. Accordingly, even when the thermal shrinkage rate is reduced, the temperature of the molten glass in the refining process is adjusted to be higher than that in the past. Thus, the manufacturing method of the present invention capable of suppressing deformation and breakage of the piping around the
以上、本発明の実施形態について図面に基づいて説明したが、具体的な構成は、上記の実施形態に限られるものではなく、発明の要旨を逸脱しない範囲で変更可能である。 (8) Modifications While the embodiment of the present invention has been described with reference to the drawings, the specific configuration is not limited to the above-described embodiment, and can be changed without departing from the gist of the invention. .
上記実施形態では、第1配管105に限定して説明したが、これに限られるものではなく、白金族元素又は白金族元素合金製の配管を用いる箇所、例えば、第2配管106等に適用可能である。 (8-1) Modification 1A
In the above embodiment, the
上記実施形態では、第1部材113a及び第2部材113bは、それぞれ、2つのフランジ部213b,213c、214b,214cを有すると説明したが、個数は、2つに限られるものではなく、少なくとも1のフランジ部を有していればよい。 (8-2) Modification 1B
In the above embodiment, the
上記実施形態では、第1部材113a及び第2部材113bは、それぞれ、フランジ部213b,213c,214b,214cを有すると説明したが、フランジ部213b,213c,214b,214cは必須の構成でなくてもよい。 (8-3) Modification 1C
In the above embodiment, the
上記実施形態では、第1部材113aと第2部材113bとの間に、フランジ部間空間S4が存在すると説明したが、これに限られるものではなく、第1部材113aと第2部材113bとは接触してもよい。すなわち、フランジ部間空間S4を形成しなくてもよい。この場合の一例を図8に示す。この場合、例えば、第1部材113aの覆い部213a及び/又は第2部材113bの覆い部214aの円弧部分を長く形成すれば、隙間S2及び隙間S3を形成しつつフランジ部間空間S4を形成しないようにすることができる。 (8-4) Modification 1D
In the above embodiment, it has been described that the flange portion space S4 exists between the
上記実施形態では、覆い部材113は、第1部材113aと、第2部材113bとを有すると説明したが、これに限られるものではない。 (8-5) Modification 1E
In the above-described embodiment, the
上記実施形態では、攪拌槽103と第2管112とは接続されていると説明したがこれに限られるものではない。例えば、第2管112が攪拌槽103側の端部にフランジ部(図示せず)を有している場合、第2管112は、フランジ部が攪拌槽103の壁面に溶接等により接合されることで、攪拌槽103に接続されてもよい。なお、他の間に関しても装置との接続方法は特に限定されない。 (8-6) Modification 1F
In the above embodiment, the stirring
上記実施形態では、供給工程ST4において、1日あたり6t以上の溶融ガラスが供給されると説明したが、これに限られるものではなく、3t以上であってもよい。 (8-7) Modification 1G
In the above-described embodiment, it has been described that 6 t or more of molten glass is supplied per day in the supply step ST4. However, the present invention is not limited to this and may be 3 t or more.
上記実施形態では、フランジ部間空間S4に入り込んだ溶融ガラスは、外部に漏れやすくなるほどは柔らかくなく、一方、粘性流動が生じる程度の粘度になっていると説明したがこれに限られない。 (8-8) Modification 1H
In the above embodiment, it has been described that the molten glass that has entered the space S4 between the flanges is not so soft that it easily leaks to the outside, but on the other hand, the viscosity is such that viscous flow occurs.
上記実施形態では、覆い部材113は、2つの開口部313が形成されるような構成を採っているがこれに限られるものではなく、開口部313が少なくとも1つ形成されるような構成を採ってもよい。 (8-9) Modification 1I
In the above embodiment, the
104 成形装置
105 第1配管(配管)
111 第1管
112 第2管
113 覆い部材
213a,214a 覆い部
213b,213c,214b,214c フランジ部
S1 第1空間(熱膨張許容空間)
S4 フランジ部間空間
ST1 溶解工程
ST4 供給工程
ST5 成形工程 DESCRIPTION OF
111 1st pipe |
S4 Flange space ST1 Dissolution process ST4 Supply process ST5 Molding process
Claims (11)
- ガラス原料を溶解して溶融ガラスとする溶解工程と、
前記溶融ガラスを白金族元素又は白金族元素合金製の配管内に流して搬送する搬送工程と、
前記溶融ガラスを成形装置に供給する供給工程と、
前記供給工程から供給された前記溶融ガラスをシートガラスに成形する成形工程と、
前記シートガラスを切断してガラス板を形成する切断工程と、
を備え、
前記搬送工程において前記溶融ガラスを搬送する前記配管は、
離間して設置され、その間に、操業時の熱膨張を許容する熱膨張許容空間が形成される第1管及び第2管と、
前記第1管及び前記第2管の端部と前記熱膨張許容空間とを覆い、前記第1管及び前記第2管に対して軸方向に移動自在な覆い部材と、
を有し、
前記搬送工程は、前記第1管から前記熱膨張許容空間を介して前記第2管へ前記溶融ガラスを搬送する際に、前記溶融ガラスから前記覆い部材の外部への熱移動量を、前記溶融ガラスから前記第1管及び前記第2管の外部へ移動する熱の熱移動量に比べて大きくすることで、前記溶融ガラスの粘度を上昇させる粘度上昇工程を含む、
ガラス板の製造方法。 A melting step of melting glass raw material to form molten glass;
A transporting step for transporting the molten glass by flowing it into a pipe made of a platinum group element or a platinum group element alloy;
Supplying the molten glass to a molding apparatus;
A forming step of forming the molten glass supplied from the supplying step into a sheet glass;
A cutting step of cutting the sheet glass to form a glass plate;
With
The piping for conveying the molten glass in the conveying step is
A first pipe and a second pipe that are spaced apart and in which a thermal expansion allowance space that allows thermal expansion during operation is formed;
A covering member that covers end portions of the first tube and the second tube and the thermal expansion allowable space, and is movable in an axial direction with respect to the first tube and the second tube;
Have
In the transporting step, when the molten glass is transported from the first tube to the second tube through the thermal expansion allowable space, the amount of heat transferred from the molten glass to the outside of the covering member is determined. Including a viscosity increasing step of increasing the viscosity of the molten glass by increasing the amount of heat transferred from the glass to the outside of the first tube and the second tube,
Manufacturing method of glass plate. - 前記粘度上昇工程では、前記第1管の前記第2管側の端部と前記覆い部材との間において前記溶融ガラスの一部の粘度を上昇させ、前記第2管の前記第1管側の端部と前記覆い部材との間において前記溶融ガラスの一部の粘度を上昇させる、
請求項1に記載のガラス板の製造方法。 In the viscosity increasing step, the viscosity of a part of the molten glass is increased between the end portion on the second tube side of the first tube and the covering member, and the first tube side of the second tube is increased. Increasing the viscosity of a portion of the molten glass between the end and the covering member,
The manufacturing method of the glass plate of Claim 1. - 前記粘度上昇工程では、前記第1管の前記第2管側の端部と前記覆い部材との間において前記溶融ガラスの粘度ηについてlogη=4~13とし、前記第2管の前記第1管側の端部と前記覆い部材との間において前記溶融ガラスの粘度ηについてlogη=4~13とする、
請求項1又は2に記載のガラス板の製造方法。 In the viscosity increasing step, log η = 4 to 13 for the viscosity η of the molten glass between the end of the first tube on the second tube side and the covering member, and the first tube of the second tube Log η = 4 to 13 for the viscosity η of the molten glass between the end portion on the side and the covering member;
The manufacturing method of the glass plate of Claim 1 or 2. - 前記ガラス板の製造に用いる前記溶融ガラスの粘度ηにおいてlogη=2.5となる温度が1500℃~1750℃である、
請求項1~3のいずれか1項に記載のガラス板の製造方法。 The temperature at which log η = 2.5 in the viscosity η of the molten glass used for the production of the glass plate is 1500 ° C. to 1750 ° C.,
The method for producing a glass plate according to any one of claims 1 to 3. - 前記ガラス板の製造に用いるガラスの歪点が655℃以上である、
請求項4に記載のガラス板の製造方法。 The strain point of the glass used for manufacturing the glass plate is 655 ° C. or higher.
The manufacturing method of the glass plate of Claim 4. - 前記ガラス原料は、清澄剤として、酸化スズを含む、
請求項1~5のいずれか1項に記載のガラス板の製造方法。 The glass raw material contains tin oxide as a fining agent,
The method for producing a glass plate according to any one of claims 1 to 5. - 前記ガラス板は、SiO2とAl2O3を含有し、前記ガラス板の前記SiO2と前記Al2O3の合計含有率は70質量%以上であり、
前記ガラス板のアルカリ金属酸化物の含有率は2質量%以下である、
請求項1~6のいずれか1項に記載のガラス板の製造方法。 The glass plate containing SiO 2 and Al 2 O 3, the total content of the SiO 2 and the Al 2 O 3 of the glass plate is 70 mass% or more,
The content of alkali metal oxide in the glass plate is 2% by mass or less.
The method for producing a glass plate according to any one of claims 1 to 6. - 前記ガラス板は、アルカリ金属酸化物の含有率が0.05質量%を越え2.0質量%以下である、請求項1~7のいずれか1項に記載のガラス板の製造方法。 The method for producing a glass plate according to any one of claims 1 to 7, wherein the glass plate has an alkali metal oxide content of more than 0.05% by mass and 2.0% by mass or less.
- 前記ガラス板は、アルカリを実質的に含有しない無アルカリガラスである、
請求項1~7のいずれか1項に記載のガラス板の製造方法。 The glass plate is an alkali-free glass substantially free of alkali.
The method for producing a glass plate according to any one of claims 1 to 7. - 前記ガラス板は、SiO2を50~70質量%、B2O3を0~15質量%、Al2O3を5~25質量%、MgOを0~10質量%、CaOを0~20質量%、SrOを0~20質量%、BaOを0~10質量%、ROを5~20質量%(但し、RはMg、Ca、Sr及びBaから選ばれる少なくとも1種である)含有する、
請求項1~9のいずれか1項に記載のガラス板の製造方法。 The glass plate, a SiO 2 50 ~ 70 wt%, B 2 O 3 0 to 15 mass%, the Al 2 O 3 5 ~ 25 wt%, the MgO 0 ~ 10 wt%, 0-20 mass CaO %, SrO 0 to 20% by mass, BaO 0 to 10% by mass, RO 5 to 20% by mass (provided that R is at least one selected from Mg, Ca, Sr and Ba),
The method for producing a glass plate according to any one of claims 1 to 9. - ガラス原料を溶解して溶融ガラスとする溶解槽と、
前記溶融ガラスをシートガラスに成形する成形装置と、
前記溶解槽と前記成形装置との間に配置され、内部を前記溶融ガラスが流れる白金族元素又は白金族元素合金製である配管と、
を備え、
前記配管は、
離間して設置され、その間に、操業時の熱膨張を許容する熱膨張許容空間が形成される第1管及び第2管と、
前記第1管及び前記第2管の端部と前記熱膨張許容空間とを覆い、前記第1管及び前記第2管に対して軸方向に移動自在な覆い部材と、
を有し、
前記配管は、前記第1管から前記熱膨張許容空間を介して前記第2管へ前記溶融ガラスを搬送する際に、前記溶融ガラスから前記覆い部材の外部への熱移動量を、前記溶融ガラスから前記第1管及び前記第2管の外部へ移動する熱移動量に比べて大きくすることで、前記溶融ガラスの粘度を上昇させる、
ガラス板の製造装置。
A melting tank for melting glass raw material to form molten glass;
A molding apparatus for molding the molten glass into a sheet glass;
A pipe that is disposed between the melting tank and the molding apparatus and is made of a platinum group element or a platinum group element alloy through which the molten glass flows,
With
The piping is
A first pipe and a second pipe that are spaced apart and in which a thermal expansion allowance space that allows thermal expansion during operation is formed;
A covering member that covers end portions of the first tube and the second tube and the thermal expansion allowable space, and is movable in an axial direction with respect to the first tube and the second tube;
Have
The pipe transfers the amount of heat transferred from the molten glass to the outside of the covering member when the molten glass is transported from the first pipe to the second pipe through the thermal expansion allowable space. By increasing the amount of heat transfer from the first pipe and the second pipe to the outside, the viscosity of the molten glass is increased.
Glass plate manufacturing equipment.
Priority Applications (3)
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JP2012515250A JP5162725B2 (en) | 2011-03-30 | 2012-03-23 | Glass plate manufacturing method and glass plate manufacturing apparatus |
KR1020127013128A KR101280703B1 (en) | 2011-03-30 | 2012-03-23 | Method and apparatus for making glass sheet |
CN201280003099.XA CN103153884B (en) | 2011-03-30 | 2012-03-23 | Production method for glass sheet and glass sheet production device |
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JP2011074998 | 2011-03-30 | ||
JP2011-074998 | 2011-03-30 |
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WO2012132368A1 true WO2012132368A1 (en) | 2012-10-04 |
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PCT/JP2012/002030 WO2012132368A1 (en) | 2011-03-30 | 2012-03-23 | Production method for glass sheet and glass sheet production device |
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JP (1) | JP5162725B2 (en) |
KR (1) | KR101280703B1 (en) |
CN (1) | CN103153884B (en) |
TW (1) | TWI402231B (en) |
WO (1) | WO2012132368A1 (en) |
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JP2016108190A (en) * | 2014-12-08 | 2016-06-20 | 日本電気硝子株式会社 | Strengthened glass and production method thereof |
JP2017178731A (en) * | 2016-03-31 | 2017-10-05 | AvanStrate株式会社 | Manufacturing method of glass sheet |
JP2020037494A (en) * | 2018-09-03 | 2020-03-12 | 日本電気硝子株式会社 | Method for manufacturing glass article |
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JP2016108190A (en) * | 2014-12-08 | 2016-06-20 | 日本電気硝子株式会社 | Strengthened glass and production method thereof |
JP2017178731A (en) * | 2016-03-31 | 2017-10-05 | AvanStrate株式会社 | Manufacturing method of glass sheet |
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Also Published As
Publication number | Publication date |
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TW201247578A (en) | 2012-12-01 |
JP5162725B2 (en) | 2013-03-13 |
CN103153884B (en) | 2014-07-16 |
JPWO2012132368A1 (en) | 2014-07-24 |
CN103153884A (en) | 2013-06-12 |
TWI402231B (en) | 2013-07-21 |
KR20120127710A (en) | 2012-11-23 |
KR101280703B1 (en) | 2013-07-01 |
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