WO2024029317A1 - ガラス物品の製造装置及び製造方法、並びに、液面高さ測定方法 - Google Patents

ガラス物品の製造装置及び製造方法、並びに、液面高さ測定方法 Download PDF

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Publication number
WO2024029317A1
WO2024029317A1 PCT/JP2023/026103 JP2023026103W WO2024029317A1 WO 2024029317 A1 WO2024029317 A1 WO 2024029317A1 JP 2023026103 W JP2023026103 W JP 2023026103W WO 2024029317 A1 WO2024029317 A1 WO 2024029317A1
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WIPO (PCT)
Prior art keywords
liquid level
nozzle
molten glass
storage tank
glass
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2023/026103
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
宏介 浅井
裕之 板津
真吾 徳永
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Electric Glass Co Ltd
Original Assignee
Nippon Electric Glass Co Ltd
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 Nippon Electric Glass Co Ltd filed Critical Nippon Electric Glass Co Ltd
Priority to US18/994,312 priority Critical patent/US20260015277A1/en
Priority to CN202380055122.8A priority patent/CN119585216A/zh
Priority to JP2024538903A priority patent/JPWO2024029317A1/ja
Priority to EP23849876.0A priority patent/EP4538240A4/en
Publication of WO2024029317A1 publication Critical patent/WO2024029317A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
    • C03B5/24—Automatically regulating the melting process
    • C03B5/245—Regulating the melt or batch level, depth or thickness
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/04—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in tank furnaces
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
    • C03B5/167—Means for preventing damage to equipment, e.g. by molten glass, hot gases, batches
    • C03B5/1672—Use of materials therefor
    • C03B5/1675—Platinum group metals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
    • G01F23/16—Indicating, recording, or alarm devices being actuated by mechanical or fluid means, e.g. using gas, mercury, or a diaphragm as transmitting element, or by a column of liquid
    • G01F23/165—Indicating, recording, or alarm devices being actuated by mechanical or fluid means, e.g. using gas, mercury, or a diaphragm as transmitting element, or by a column of liquid of bubbler type
    • G01F23/168—Indicating, recording, or alarm devices being actuated by mechanical or fluid means, e.g. using gas, mercury, or a diaphragm as transmitting element, or by a column of liquid of bubbler type with electric indicating or recording

Definitions

  • the present invention relates to a technique for measuring the liquid level of molten glass stored in a storage tank.
  • a storage tank in which molten glass is stored is used.
  • this type of storage tank it is necessary to suppress large fluctuations in the liquid level of the molten glass stored in the storage tank in order to homogenize the molten glass and stabilize the flow rate of the molten glass. It becomes necessary. Therefore, it is important to measure the liquid level of the molten glass.
  • Patent Document 1 discloses a device that supplies gas into molten glass through a flow path member to generate bubbles, and also generates bubbles.
  • a method is disclosed in which the liquid level height of molten glass is determined based on the pressure (back pressure) inside a flow path member in a state where the liquid level is high.
  • the flow path member is prone to wear due to heat and erosion due to molten glass, and may need to be replaced.
  • the channel member is introduced into the molten glass through the bottom wall or side wall of the storage tank (melting furnace) at a position lower than the liquid level of the molten glass. That is, the introduction part (hole) of the channel member in the wall of the storage tank is located at a position lower than the liquid level of the molten glass and faces the molten glass. Therefore, when replacing the flow path member, there is a risk that the molten glass in the storage tank may leak from the introduction portion of the flow path member. As a result, the liquid level height measuring device described in Patent Document 1 has a problem in that maintenance is extremely difficult.
  • the introduction part of the flow path member is installed on the wall of the storage tank at a position lower than the liquid level of the molten glass. It is necessary to form a new one.
  • the liquid level height measuring device described in Patent Document 1 has a problem in that it is extremely difficult to apply it to existing storage tanks.
  • An object of the present invention is to provide a liquid level measuring device and a measuring method that are easy to maintain and apply to existing storage tanks.
  • the present invention which was created to solve the above problems, consists of a storage tank that stores molten glass, and a liquid level height measurement that measures the height of the liquid level of the molten glass stored in the storage tank.
  • the liquid level height measuring device includes a nozzle that is immersed into the molten glass from the liquid level, and a nozzle that is introduced into the storage tank from outside the storage tank at a position higher than the liquid level. It includes piping for supplying gas to the nozzle and a pressure gauge for measuring the pressure inside the piping or the nozzle.
  • the nozzle is immersed into the molten glass from the liquid level of the molten glass, and the pipe is guided from outside the storage tank into the storage tank at a position higher than the liquid level of the molten glass. That is, since the introduction part of the pipe in the wall of the storage tank is located at a higher position than the liquid level of the molten glass, a situation in which molten glass leaks from the introduction part of the pipe does not substantially occur. Therefore, maintenance of the liquid level height measuring device and application to an existing storage tank are facilitated.
  • the piping be guided from outside the storage tank into the storage tank through a hole provided in the side wall of the storage tank.
  • the piping can be made shorter than when it passes through the ceiling wall of the storage tank, so equipment costs can be reduced.
  • the nozzle is preferably held at a predetermined height by piping.
  • the piping is preferably provided with a cooling structure.
  • the nozzle preferably includes a tube made of platinum or a platinum alloy through which gas flows.
  • the nozzle preferably includes a fireproof layer made of a refractory material that covers the pipe portion, and a protective layer made of platinum or a platinum alloy that covers the fireproof layer.
  • the protective layer can suppress erosion of the nozzle by the molten glass. Further, since the strength of the nozzle can be improved by the fireproof layer, it is possible to suppress deformation of the nozzle due to force received from glass raw materials, molten glass, etc. when immersed in molten glass.
  • the outer diameter of the nozzle tip can be made small, making it difficult for air bubbles to stagnate around the nozzle tip. Therefore, when bubbles are generated from the nozzle tip, a back pressure corresponding to the pressure applied to the molten glass at the nozzle tip acts correctly within the nozzle or piping, and the accuracy of measuring the liquid level height is improved.
  • the present invention which was created in order to solve the above problems, is a liquid level height measuring method for measuring the height of the liquid level of molten glass stored in a storage tank.
  • a nozzle that is immersed in the glass and a pipe that supplies gas from outside the storage tank to the nozzle through the space above the molten glass in the storage tank are installed, and the height of the liquid level is controlled based on the pressure inside the pipe or nozzle. Characterized by seeking.
  • the present invention which was created to solve the above problems, is a method for manufacturing a glass article that includes a liquid level height measuring step of measuring the height of the liquid level of molten glass stored in a storage tank.
  • the liquid level height measuring step is characterized in that the liquid level height is measured by a method having the configuration (8) above.
  • FIG. 2 is an enlarged cross-sectional view showing the vicinity of a nozzle of the liquid level height measuring device. 5 is a sectional view taken along line II-II in FIG. 4.
  • FIG. 2 is an enlarged sectional view showing the vicinity of a nozzle of a liquid level height measuring device according to a second embodiment of the present invention. It is a sectional view of the melting furnace concerning a third embodiment of the present invention.
  • the glass article manufacturing apparatus includes a melting furnace 1, a clarification tank 2, a homogenization tank (stirring tank) 3, a pot 4, a molded body 5, and a molded body 5. It includes transfer pipes 6 to 9 that connect the components 1 to 5.
  • the melting furnace 1 is a space for performing a melting process to obtain molten glass Gm.
  • the molten glass Gm functions as a storage tank that stores the molten glass Gm.
  • the fining tank 2 is a space for performing a fining process in which the molten glass Gm supplied from the melting furnace 1 is clarified (bubble removed) by the action of a fining agent or the like.
  • the homogenization tank 3 is a space for performing a homogenization step in which the clarified molten glass Gm is stirred by a stirrer 3a and homogenized.
  • the homogenization tank 3 may be a combination of a plurality of homogenization chambers.
  • the pot 4 is a space for performing a conditioning step of adjusting the molten glass Gm to a condition (for example, viscosity) suitable for molding. Note that the pot 4 may be omitted.
  • the molded body 5 constitutes a molding device and is used to perform a molding process of molding the molten glass Gm into a desired shape.
  • the molded body 5 is formed by molding the molten glass Gm into a band-shaped glass ribbon using an overflow down-draw method.
  • the molded body 5 has a substantially wedge-shaped cross-sectional shape (cross-sectional shape perpendicular to the paper surface), and an overflow groove (not shown) is formed in the upper part of the molded body 5.
  • Molten glass Gm is supplied to the overflow groove by a transfer pipe 9.
  • the molten glass Gm supplied to the overflow groove overflows from the overflow groove and flows down along both side wall surfaces of the molded body 5 (side surfaces located on the front and back sides of the paper).
  • the molten glass Gm flowing down the side wall surface fuses at the lower top of the side wall surface and is formed into a band-shaped glass ribbon Gr.
  • a glass plate as a glass article or a glass roll obtained by winding up a glass ribbon is manufactured.
  • the thickness of the glass ribbon Gr is preferably 0.01 to 2 mm, for example. More preferably, it is 1 to 1 mm.
  • Glass plates or glass rolls are used as substrates and protective covers for displays (for example, liquid crystal displays, organic EL displays, etc.), organic EL lighting, solar cells, etc.
  • displays for example, liquid crystal displays, organic EL displays, etc.
  • organic EL lighting for example, organic EL lighting, solar cells, etc.
  • the molding device is not limited to one that performs the overflow downdraw method.
  • the molding device may perform other down-draw methods such as a slot down-draw method, or a float method.
  • the transfer tubes 6 to 9 are composed of cylindrical tubes made of platinum or a platinum alloy, for example, and transfer the molten glass Gm in the lateral direction (substantially horizontal direction).
  • the transfer pipes 6 to 9 are electrically heated as necessary.
  • platinum includes reinforced platinum
  • platinum alloy includes reinforced platinum alloy (the same applies hereinafter).
  • the melting furnace 1 includes a bottom wall 1a, a side wall 1b, and a ceiling wall 1c, and each of these components 1a to 1c defines a space for storing molten glass Gm. do.
  • the side wall 1b includes a front wall 1b1, a rear wall 1b2, a left wall 1b3, and a right wall 1b4.
  • the glass raw material Ga may contain cullet in addition to natural raw materials and chemical raw materials.
  • the molten glass Gm is preferably alkali-free glass or aluminosilicate glass for chemical strengthening.
  • the front wall 1b1 of the melting furnace 1 is provided with an input port 10 for inputting glass raw material Ga.
  • This input port 10 is provided with a screw feeder 11 as a raw material supply means.
  • the raw material supply means may be other known means such as a pusher or a vibratory feeder.
  • the number and arrangement positions of the raw material supply means can be changed as appropriate depending on the size of the melting furnace 1 and the like.
  • the rear wall 1b2 of the melting furnace 1 is provided with an outlet 12 through which the molten glass Gm flows out.
  • a transfer pipe 6 is connected to this outlet 12, so that the molten glass Gm is sequentially supplied to the downstream side.
  • a plurality of rod-shaped electrodes 13 are provided on the bottom wall 1a of the melting furnace 1.
  • the electrode 13 is not limited to a rod shape, but may be a plate shape or a block shape, or a combination of these.
  • the electrode 13 may be provided not only on the bottom wall 1a but also on the left wall 1b3 and the right wall 1b4.
  • the electrode 13 is made of molybdenum (Mo), for example.
  • Mo molybdenum
  • the electrode 13 heats the molten glass Gm with electricity while being immersed in the molten glass Gm.
  • the electrode 13 is housed in a through hole provided in the bottom wall 1a while being held by a cylindrical electrode holder 14 equipped with a cooling mechanism (not shown).
  • the heating method in the melting furnace 1 is not limited to the all-electric melting method that uses only electrical heating, for example, a method that heats the molten glass Gm from above the liquid level LS by only burning gas fuel (burner). , a method of heating using a combination of electrical heating and combustion of gas fuel may be used.
  • the melting furnace 1 includes a liquid level measuring device 21 that measures the height H1 of the liquid level LS of the molten glass Gm. Note that the height H1 of the liquid level LS of the molten glass Gm is defined with the height position of the tip of the nozzle 22 as a reference (zero level).
  • the liquid level height measuring device 21 includes a nozzle 22, a pipe 23, a gas supply section 24, and a pressure gauge 25.
  • the nozzle 22 generates bubbles B in the molten glass Gm from its tip.
  • the nozzle 22 is immersed into the molten glass Gm from the liquid level LS.
  • the nozzle 22 has a substantially vertical posture, and has a first portion 22a located below the liquid level LS and immersed in the molten glass Gm, and a first portion 22a located above the liquid level LS and not immersed in the molten glass Gm. and a second portion 22b.
  • the first portion 22a includes the distal end of the nozzle 22, and the second portion 22b includes the proximal end of the nozzle 22. Note that the nozzle 22 may be in an inclined position.
  • Piping 23 supplies gas A for generating bubbles B to nozzle 22.
  • Gas A is supplied to the pipe 23 from a gas supply unit (for example, a compressor) 24 .
  • the pipe 23 is introduced into the melting furnace 1 from outside the melting furnace 1 in a substantially horizontal position through a horizontal hole X1 provided in the side wall 1b (left wall 1b3 in the illustrated example) of the melting furnace 1 at a position higher than the liquid level LS. It will be destroyed.
  • the pipe 23 guided into the melting furnace 1 is bent downward from a substantially horizontal position to a substantially vertical position in the space above the liquid level LS, and the base end of the nozzle 22 is located above the liquid level LS. connected to the section. That is, the pipe 23 does not come into contact with the molten glass Gm.
  • the piping 23 is provided with a first straight section 23a extending in a substantially horizontal direction, a second straight section 23b extending in a substantially vertical direction, and between the first straight section 23a and the second straight section 23b.
  • a third linear portion 23c is provided which slopes downward from the portion 23a and reaches a second linear portion 23b.
  • the first straight part 23a is arranged so as to straddle the inside and outside of the melting furnace 1 through the horizontal hole X1 of the side wall 1b, and the second straight part 23b and the third straight part 23c are arranged inside the melting furnace 1.
  • the shape of the pipe 23 is not particularly limited.
  • the piping 23 may omit the third straight portion 23c and connect the first straight portion 23a and the second straight portion 23b at a substantially right angle, or may include a curved portion in place of the third straight portion 23c. You may prepare.
  • the horizontal hole X1 through which the pipe 23 is passed may be newly installed at a position higher than the liquid level LS of the side wall 1b, but for example, a horizontal hole such as an observation window for observing the inside of the furnace may be installed at a position higher than the liquid level LS of the side wall 1b. If holes are provided in advance, these existing horizontal holes may be used. Note that if there is a gap between the pipe 23 and the horizontal hole X1 when the pipe 23 is inserted into the horizontal hole good.
  • the nozzle 22 and the piping 23 are connected to each other and integrated, and the nozzle 22 is held at a predetermined height by the piping 23.
  • no member other than the pipe 23 for holding the nozzle 22 is provided in the melting furnace 1 .
  • the pipe 23 and the nozzle 22 can be inserted into and removed from the melting furnace 1 through the side hole X1.
  • the pipe 23 is held by a holding member 26 outside the melting furnace 1.
  • the horizontal hole X1 through which the pipe 23 passes is located above the liquid level LS of the molten glass Gm. Therefore, a situation in which the molten glass Gm leaks to the outside from the side hole X1 does not substantially occur. Therefore, maintenance of the liquid level height measuring device 21 and application to the existing melting furnace 1 are facilitated.
  • the pressure gauge 25 measures the pressure (back pressure) inside the piping 23 or the nozzle 22 when the gas A generates bubbles B in the molten glass Gm from the tip of the nozzle 22. Note that since the pipe 23 and the nozzle 22 constitute one gas supply path, the pressure inside the pipe 23 and the pressure inside the nozzle 22 are substantially the same. Therefore, either the pressure inside the pipe 23 or the pressure inside the nozzle 22 may be measured. In this embodiment, the pressure gauge 25 is configured to measure the pressure inside the pipe 23 outside the melting furnace 1.
  • the height H1 of the liquid level LS of the molten glass Gm is determined as follows.
  • the pressure gauge 25 is configured with a differential pressure gauge (for example, a gauge pressure gauge).
  • a differential pressure gauge for example, a gauge pressure gauge
  • the pressure P2 of the liquid level LS of the molten glass Gm in the melting furnace 1 may be adjusted higher or lower than the atmospheric pressure PA.
  • the pressure gauge 25 measures the pressure P1 in the pipe 23 instead of measuring the pressure difference (P1-P2) between the pressure P1 in the pipe 23 and the pressure P2 at the liquid level LS of the molten glass Gm. and atmospheric pressure PA (P1-PA). Then, by measuring the differential pressure (P1-PA), the height H1 of the liquid level LS of the molten glass Gm can be calculated from equation (4).
  • the pressure gauge 25 may be configured to measure differential pressure (P1-P2).
  • the pressure gauge 25 may be an absolute pressure gauge that can individually measure each pressure required to calculate the height H1.
  • the liquid level height measuring device 21 may include a calculation unit that automatically calculates the height H1 of the liquid level LS of the molten glass Gm according to equation (3) or (4).
  • the height difference H2 between the bottom wall 1a and the height position of the tip of the nozzle 22 can be measured in advance or set to a default value, the molten glass Gm with the bottom wall 1a as a reference (zero level) It is also possible to determine the height (H1+H2) of the liquid level LS.
  • the nozzle 22 includes a tube portion 27, a fireproof layer 28, and a protective layer 29.
  • the tube portion 27 is a tubular body made of platinum or platinum alloy through which the gas A flows inside S1.
  • the refractory layer 28 is a layer made of refractory material that covers the pipe portion 27.
  • the strength of the nozzle 22 can be improved, so that the force (for example, upward force) received from the frit Ga or the molten glass Gm when immersed in the molten glass Gm, etc. Therefore, deformation of the nozzle 22 (strictly speaking, the tube portion 27) can be suppressed.
  • the refractory material constituting the refractory layer 28 for example, bricks, monolithic refractories, etc. can be used.
  • alumina electroformed bricks for example, zirconia electroformed bricks, alumina electroformed bricks, alumina-zirconia electroformed bricks, AZS (Al-Zr-Si) electroformed bricks, and high-purity alumina (for example, alumina tubes) can be used. I can do it.
  • refractory cement such as alumina cement can be used.
  • the protective layer 29 is a layer made of platinum or platinum alloy for covering the fireproof layer 28. By providing the protective layer 29 in this manner, erosion of the fireproof layer 28 by the molten glass Gm can be suppressed.
  • the tip of the tube portion 27 is exposed without being covered with the fireproof layer 28 and the protective layer 29. In other words, the tip of the tube portion 27 projects further downward than the tips of the fireproof layer 28 and the protective layer 29.
  • the protrusion amount L1 of the exposed tip of the tube portion 27 is, for example, preferably 10 to 200 mm, more preferably 50 to 100 mm.
  • the outer diameter of the exposed tube portion 27 is, for example, preferably 10 to 50 mm, more preferably 10 to 30 mm.
  • the tips of the fireproof layer 28 and the protective layer 29 include flat portions 28a and 29a that are substantially perpendicular to the longitudinal direction of the tube portion 27.
  • the outer diameter of the tip of the nozzle 22 can be reduced, making it difficult for the bubbles B to stagnate around the tip of the nozzle 22. Therefore, when bubbles B are generated from the tip of the nozzle 22, back pressure acts correctly within the nozzle 22 or the pipe 23, and the measurement accuracy of the height H1 of the liquid level LS is improved.
  • the pipe 23 includes an inner pipe through which the gas A for generating bubbles B in the molten glass Gm flows, and a cooling structure arranged to cover the inner pipe.
  • the inner tube and cooling structure can be made of stainless steel or heat-resistant steel, for example.
  • the proximal end of the inner tube communicates with the gas supply section 24, and the distal end of the inner tube communicates with the proximal end of the tube section 27 of the nozzle 22. Therefore, the gas A supplied from the gas supply section 24 flows through the inner tube of the pipe 23, flows through the inside S1 of the tube section 27 of the nozzle 22, and is discharged into the molten glass Gm.
  • the cooling structure has a flow path through which a refrigerant supplied and discharged from the outside flows. Therefore, wear and tear of the pipe 23 (inner pipe) due to heat can be prevented.
  • This method includes a melting step, a molten glass supply step, a molding step, a slow cooling step, and a cutting step.
  • the liquid surface LS of the molten glass Gm may be covered with a coating layer Gx.
  • the coating layer Gx includes glass raw material Ga and/or foam layer Gb.
  • the bubble layer Gb is formed as carbon dioxide gas (CO or CO 2 ), O 2 gas, SO 2 gas, etc. are generated due to the frit Ga.
  • the melting process further includes a liquid level height measuring process of measuring the height of the liquid level LS of the molten glass Gm stored in the melting furnace 1.
  • the liquid level height measuring device 21 is used to measure the height of the liquid level LS.
  • gas A is supplied to the nozzle 22 through the pipe 23, and bubbles B are generated in the molten glass Gm from the tip of the nozzle 22.
  • the pressure difference (P1-PA) between the pressure P1 inside the nozzle 22 (pipe portion 27) or the pipe 23 and the atmospheric pressure PA when the bubbles B are generated is measured with the pressure gauge 25.
  • the height H1 of the liquid level LS is calculated from equation (4) based on the measured differential pressure (P1-PA).
  • the molten glass Gm in the melting furnace 1 is sequentially transferred to the refining tank 2, the homogenization tank 3, the pot 4, and the molded body 5 via the respective transfer pipes 6 to 9.
  • the molten glass Gm is clarified (bubble removed) by the action of a fining agent or the like (clarification step).
  • the homogenization tank 3 the molten glass Gm is stirred and homogenized (homogenization step).
  • the state (for example, viscosity and flow rate) of the molten glass Gm is adjusted (condition adjustment step).
  • molten glass Gm is supplied to the molded body 5 through a molten glass supply process.
  • the molded body 5 causes the molten glass Gm to overflow from the overflow groove and flow down along its side wall surface.
  • the molded body 5 forms a glass ribbon Gr by fusing the molten glass Gm that has flowed down at the lower top.
  • the glass ribbon Gr is cooled in a slow cooling furnace in a slow cooling process, and cut by a cutting device in a cutting process. Thereby, a glass plate of a predetermined size is cut out from the glass ribbon Gr.
  • the glass ribbon Gr may be wound into a roll to obtain a glass roll (winding process).
  • the nozzle 22 includes a tube portion 27, a fireproof layer 28, and a protective layer 29, as in the first embodiment, and the tip of the tube portion 27 is fireproof. It is exposed without being covered by the layer 28 and the protective layer 29. In other words, the tip of the tube portion 27 projects further downward than the tips of the fireproof layer 28 and the protective layer 29.
  • the tip portions of the fireproof layer 28 and the protective layer 29 include tapered portions 28b and 29b whose diameter gradually increases upward from the tip.
  • the tapered portions 28b, 29b in this manner, the bubbles B rising due to buoyancy are smoothly guided upward along the tapered portions 28b, 29b. Therefore, the bubbles B are less likely to stagnate around the tip of the nozzle 22, and the measurement accuracy of the height H1 of the liquid level LS is further improved.
  • the force received from frit Ga, molten glass Gm, etc. during immersion into molten glass Gm can be reduced, and the nozzle 22 can be immersed smoothly into molten glass.
  • the inclination angle ⁇ of the tapered portions 28b and 29b with respect to the vertical direction is preferably 10 to 60°, more preferably 30 to 45°.
  • the pipe 23 is guided into the melting furnace 1 from outside the melting furnace 1 in a substantially vertical posture through a vertical hole X2 provided in the ceiling wall 1c of the melting furnace 1 at a position higher than the liquid level LS.
  • the pipe 23 guided into the melting furnace 1 is connected to the base end of the nozzle 22 located above the liquid level LS in a substantially vertical position in the space above the liquid level LS.
  • the tip side of the nozzle 22 is immersed in the molten glass Gm from the liquid level LS.
  • the length of the pipe 23 is the same as when leading from outside the melting furnace 1 into the melting furnace 1 through the horizontal hole X1 in the side wall 1b. tends to be longer than . Therefore, from the viewpoint of reducing equipment costs, as described in the first embodiment, it is preferable that the pipe 23 be configured to lead from outside the melting furnace 1 into the inside of the melting furnace 1 through the horizontal hole X1 of the side wall 1b.
  • a glass plate and a glass roll are exemplified as the glass article, but the glass article can be, for example, a glass bulb, a glass tube, a glass block, a glass fiber, etc., and can have any shape other than these. It may be.
  • the feeder includes a bushing at the bottom that includes a plurality of nozzles for forming glass fibers from molten glass.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
PCT/JP2023/026103 2022-08-02 2023-07-14 ガラス物品の製造装置及び製造方法、並びに、液面高さ測定方法 Ceased WO2024029317A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US18/994,312 US20260015277A1 (en) 2022-08-02 2023-07-14 Device and method for producing glass article and method for measuring liquid-surface height
CN202380055122.8A CN119585216A (zh) 2022-08-02 2023-07-14 玻璃物品的制造装置及制造方法和液面高度测定方法
JP2024538903A JPWO2024029317A1 (https=) 2022-08-02 2023-07-14
EP23849876.0A EP4538240A4 (en) 2022-08-02 2023-07-14 DEVICE AND METHOD FOR MANUFACTURED A GLASS ARTICLE AND METHOD FOR MEASURING THE HEIGHT OF THE SURFACE OF A LIQUID

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Application Number Priority Date Filing Date Title
JP2022-123289 2022-08-02
JP2022123289 2022-08-02

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