WO2012132368A1 - Procédé de production pour feuille de verre et dispositif de production de feuille de verre - Google Patents

Procédé de production pour feuille de verre et dispositif de production de feuille de verre Download PDF

Info

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
Authority
WO
WIPO (PCT)
Prior art keywords
glass
molten glass
tube
pipe
glass plate
Prior art date
Application number
PCT/JP2012/002030
Other languages
English (en)
Japanese (ja)
Inventor
哲郎 君嶋
次伸 村上
正恭 松林
Original Assignee
ＡｖａｎＳｔｒａｔｅ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ＡｖａｎＳｔｒａｔｅ株式会社 filed Critical ＡｖａｎＳｔｒａｔｅ株式会社
Priority to JP2012515250A priority Critical patent/JP5162725B2/ja
Priority to KR1020127013128A priority patent/KR101280703B1/ko
Priority to CN201280003099.XA priority patent/CN103153884B/zh
Publication of WO2012132368A1 publication Critical patent/WO2012132368A1/fr

Links

Images

Classifications

    • 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
    • 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
    • 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
    • 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
    • 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
    • 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.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Glass Compositions (AREA)

Abstract

Selon l'invention, lors de la production d'une feuille de verre, une matière première de verre est fondue et utilisée comme verre fondu, le verre fondu est amené à s'écouler et à être transporté à l'intérieur d'une tuyauterie réalisée à l'aide d'un élément du groupe du platine ou d'un alliage d'un élément du groupe de platine, et est fourni à un dispositif de moulage. La tuyauterie transportant le verre fondu a : un premier tuyau et un second tuyau qui sont disposés de façon séparée et qui ont un espace permettant la dilatation thermique, qui permet une dilatation thermique pendant le fonctionnement, formé entre ceux-ci ; et un élément de couverture qui recouvre les sections d'extrémité du premier et second tuyaux et l'espace permettant une dilatation thermique, et qui est supporté de manière mobile dans la direction axiale par rapport aux premier et second tuyaux. Quand un verre fondu est transporté à partir du premier tuyau par l'intermédiaire de l'espace permettant une dilatation thermique jusqu'au second tuyau, la quantité de chaleur transférée à partir du verre fondu vers l'extérieur de l'élément de couverture est accrue, et la viscosité du verre fondu est accrue, par rapport au moment où le verre fondu est transporté dans les premier et second tuyaux. En résultat, une déformation et une détérioration de la tuyauterie dans laquelle s'écoule le verre fondu sont réduites.
PCT/JP2012/002030 2011-03-30 2012-03-23 Procédé de production pour feuille de verre et dispositif de production de feuille de verre WO2012132368A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2012515250A JP5162725B2 (ja) 2011-03-30 2012-03-23 ガラス板の製造方法及びガラス板製造装置
KR1020127013128A KR101280703B1 (ko) 2011-03-30 2012-03-23 유리판의 제조 방법 및 유리판 제조 장치
CN201280003099.XA CN103153884B (zh) 2011-03-30 2012-03-23 玻璃板的制造方法及玻璃板制造装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011074998 2011-03-30
JP2011-074998 2011-03-30

Publications (1)

Publication Number Publication Date
WO2012132368A1 true WO2012132368A1 (fr) 2012-10-04

Family

ID=46930145

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2012/002030 WO2012132368A1 (fr) 2011-03-30 2012-03-23 Procédé de production pour feuille de verre et dispositif de production de feuille de verre

Country Status (5)

Country Link
JP (1) JP5162725B2 (fr)
KR (1) KR101280703B1 (fr)
CN (1) CN103153884B (fr)
TW (1) TWI402231B (fr)
WO (1) WO2012132368A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103332850A (zh) * 2013-06-03 2013-10-02 湖北戈碧迦光电科技股份有限公司 一种光学玻璃生产线
JP2016108190A (ja) * 2014-12-08 2016-06-20 日本電気硝子株式会社 強化ガラス及びその製造方法
JP2017178731A (ja) * 2016-03-31 2017-10-05 ＡｖａｎＳｔｒａｔｅ株式会社 ガラス板の製造方法
JP2020037494A (ja) * 2018-09-03 2020-03-12 日本電気硝子株式会社 ガラス物品の製造方法
WO2020068569A1 (fr) * 2018-09-27 2020-04-02 Corning Incorporated Appareils de formation de verre comprenant des systèmes d'affinage modulaire du verre
CN112384480A (zh) * 2018-08-30 2021-02-19 日本电气硝子株式会社 玻璃物品的制造装置及制造方法
WO2022014286A1 (fr) * 2020-07-16 2022-01-20 日本電気硝子株式会社 Procédé de production d'un article en verre
JP2022152757A (ja) * 2021-03-29 2022-10-12 ＡｖａｎＳｔｒａｔｅ株式会社 ガラス基板装置
WO2022270555A1 (fr) * 2021-06-25 2022-12-29 日本電気硝子株式会社 Dispositif de production d'article en verre et procédé de production
US11919800B2 (en) 2018-09-27 2024-03-05 Corning Incorporated Modular molten glass delivery apparatus

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014119709A1 (fr) * 2013-02-01 2014-08-07 ＡｖａｎＳｔｒａｔｅ株式会社 Procédé de production d'un substrat en verre et appareil associé
JP5864690B2 (ja) * 2013-09-30 2016-02-17 ＡｖａｎＳｔｒａｔｅ株式会社 ガラス基板の製造方法、ガラス基板製造装置、及び熔融ガラス処理装置
CN103613273A (zh) * 2013-10-24 2014-03-05 芜湖东旭光电科技有限公司 一种无碱液晶基板玻璃
JP6344566B2 (ja) * 2014-09-26 2018-06-20 日本電気硝子株式会社 ガラス板の端部加工装置及び端部加工方法
JP6645497B2 (ja) * 2015-05-15 2020-02-14 日本電気硝子株式会社 強化ガラス板の製造方法、強化用ガラス板及び強化ガラス板
CN107056018B (zh) * 2017-06-09 2020-10-30 东旭光电科技股份有限公司 铂金通道流量控制系统
WO2019045099A1 (fr) * 2017-09-04 2019-03-07 日本電気硝子株式会社 Procédé et dispositif de fabrication d'un article en verre
JP6925583B2 (ja) * 2017-12-20 2021-08-25 日本電気硝子株式会社 ガラス物品の製造方法及び製造装置
CN110451780B (zh) * 2019-08-30 2022-04-22 彩虹显示器件股份有限公司 一种用于基板玻璃生产过程铂金通道的冷却段扁管及其制备方法
CN116194728A (zh) * 2020-10-08 2023-05-30 Ａｇｃ株式会社 玻璃熔解装置、玻璃的制造方法以及熔融玻璃的坯料更换方法
CN112551863B (zh) * 2020-11-30 2023-05-16 彩虹显示器件股份有限公司 一种高世代基板玻璃窑炉通道膨胀处理方法及窑炉系统
CN114873905B (zh) * 2022-05-30 2023-09-22 彩虹显示器件股份有限公司 一种用于基板玻璃通道升温膨胀管理装置及方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0867518A (ja) * 1994-08-30 1996-03-12 Canon Inc ガラス溶融・流出装置
JP2002087826A (ja) * 2000-06-29 2002-03-27 Corning Inc 減圧清澄用のチューブ装置
JP2002205123A (ja) * 2000-10-19 2002-07-23 Omg Ag & Co Kg 半径方向で波形の環状の湾曲部を有した、ｐｇｍ材料から製造される管状の構造部分を製造するための方法
WO2004070251A1 (fr) * 2003-02-04 2004-08-19 Asahi Glass Company, Limited Conduit pour verre fondu, raccord de conduit pour verre fondu et dispositif de degazage a pression reduite

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006206439A (ja) * 2003-02-04 2006-08-10 Asahi Glass Co Ltd 溶融ガラス用導管、溶融ガラス用接続導管および減圧脱泡装置
JP2005060215A (ja) * 2003-07-29 2005-03-10 Nippon Electric Glass Co Ltd ディスプレイ用ガラス基板及びその製造方法
CN101381195A (zh) * 2008-08-05 2009-03-11 河南安飞电子玻璃有限公司 玻璃板生产中熔融玻璃流量控制装置及控制方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0867518A (ja) * 1994-08-30 1996-03-12 Canon Inc ガラス溶融・流出装置
JP2002087826A (ja) * 2000-06-29 2002-03-27 Corning Inc 減圧清澄用のチューブ装置
JP2002205123A (ja) * 2000-10-19 2002-07-23 Omg Ag & Co Kg 半径方向で波形の環状の湾曲部を有した、ｐｇｍ材料から製造される管状の構造部分を製造するための方法
WO2004070251A1 (fr) * 2003-02-04 2004-08-19 Asahi Glass Company, Limited Conduit pour verre fondu, raccord de conduit pour verre fondu et dispositif de degazage a pression reduite

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103332850A (zh) * 2013-06-03 2013-10-02 湖北戈碧迦光电科技股份有限公司 一种光学玻璃生产线
JP2016108190A (ja) * 2014-12-08 2016-06-20 日本電気硝子株式会社 強化ガラス及びその製造方法
JP2017178731A (ja) * 2016-03-31 2017-10-05 ＡｖａｎＳｔｒａｔｅ株式会社 ガラス板の製造方法
CN112384480B (zh) * 2018-08-30 2023-04-04 日本电气硝子株式会社 玻璃物品的制造装置及制造方法
CN112384480A (zh) * 2018-08-30 2021-02-19 日本电气硝子株式会社 玻璃物品的制造装置及制造方法
JP7115156B2 (ja) 2018-09-03 2022-08-09 日本電気硝子株式会社 ガラス物品の製造方法
JP2020037494A (ja) * 2018-09-03 2020-03-12 日本電気硝子株式会社 ガラス物品の製造方法
US20210347668A1 (en) * 2018-09-27 2021-11-11 Corning Incorporated Glass forming apparatuses comprising modular glass fining systems
WO2020068569A1 (fr) * 2018-09-27 2020-04-02 Corning Incorporated Appareils de formation de verre comprenant des systèmes d'affinage modulaire du verre
JP7439066B2 (ja) 2018-09-27 2024-02-27 コーニング インコーポレイテッド モジュール式のガラス清澄システムを備えるガラス成形装置
US11919800B2 (en) 2018-09-27 2024-03-05 Corning Incorporated Modular molten glass delivery apparatus
WO2022014286A1 (fr) * 2020-07-16 2022-01-20 日本電気硝子株式会社 Procédé de production d'un article en verre
JP2022152757A (ja) * 2021-03-29 2022-10-12 ＡｖａｎＳｔｒａｔｅ株式会社 ガラス基板装置
JP7319316B2 (ja) 2021-03-29 2023-08-01 ＡｖａｎＳｔｒａｔｅ株式会社 ガラス基板装置
WO2022270555A1 (fr) * 2021-06-25 2022-12-29 日本電気硝子株式会社 Dispositif de production d'article en verre et procédé de production

Also Published As

Publication number Publication date
TW201247578A (en) 2012-12-01
JP5162725B2 (ja) 2013-03-13
CN103153884B (zh) 2014-07-16
JPWO2012132368A1 (ja) 2014-07-24
CN103153884A (zh) 2013-06-12
TWI402231B (zh) 2013-07-21
KR20120127710A (ko) 2012-11-23
KR101280703B1 (ko) 2013-07-01

Similar Documents

Publication Publication Date Title
JP5162725B2 (ja) ガラス板の製造方法及びガラス板製造装置
TWI478882B (zh) Manufacture method and manufacturing apparatus for glass plate
JP5752647B2 (ja) ガラス基板の製造方法
TWI480251B (zh) A manufacturing method of a glass plate and a manufacturing apparatus for a glass plate
WO2012132474A1 (fr) Procédé de production de substrat de verre
KR101486133B1 (ko) 글래스 기판의 제조 방법 및 글래스 기판의 제조 장치
KR101730743B1 (ko) 유리 기판의 제조 방법 및 유리 기판 제조 장치
WO2012132472A1 (fr) Procédé pour la production de plaque de verre
WO2012133467A1 (fr) Procédé de production d'une plaque en verre
WO2012132309A1 (fr) Procédé de production pour une plaque de verre et dispositif de production pour une plaque de verre
JP5731639B2 (ja) ガラス基板の製造方法、ガラス基板製造装置
JP5730259B2 (ja) ガラスの製造装置およびガラスの製造方法
JP5752811B2 (ja) ガラス基板の製造装置及びガラス基板の製造方法
JP6110448B2 (ja) ガラス基板の製造方法、及び、攪拌装置
JP2014047084A (ja) ガラス板の製造方法、および、ガラス板の製造装置
JP6739965B2 (ja) ガラス板の製造方法
JP2015209366A (ja) ガラス板の製造装置、及び、ガラス板の製造方法
WO2022270555A1 (fr) Dispositif de production d'article en verre et procédé de production
WO2023106093A1 (fr) Dispositif de transfert de verre, dispositif de fabrication d'article en verre et procédé de fabrication d'article en verre
JPWO2012132474A1 (ja) ガラス基板の製造方法
TW202244017A (zh) 玻璃基板製造裝置
JP2023082986A (ja) ガラス物品の製造方法
TW201904887A (zh) 玻璃基板之製造方法、及玻璃基板製造裝置
JP2018002531A (ja) ガラス板の製造方法およびガラス板の製造装置
JP2017066005A (ja) ガラス基板の製造方法及びガラス導管

Legal Events

Date Code Title Description
ENP Entry into the national phase

Ref document number: 2012515250

Country of ref document: JP

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 201280003099.X

Country of ref document: CN

ENP Entry into the national phase

Ref document number: 20127013128

Country of ref document: KR

Kind code of ref document: A

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12764483

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12764483

Country of ref document: EP

Kind code of ref document: A1