WO2024038740A1 - Procédé de fabrication d'article en verre et dispositif de fabrication d'article en verre - Google Patents

Procédé de fabrication d'article en verre et dispositif de fabrication d'article en verre Download PDF

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Publication number
WO2024038740A1
WO2024038740A1 PCT/JP2023/027277 JP2023027277W WO2024038740A1 WO 2024038740 A1 WO2024038740 A1 WO 2024038740A1 JP 2023027277 W JP2023027277 W JP 2023027277W WO 2024038740 A1 WO2024038740 A1 WO 2024038740A1
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WO
WIPO (PCT)
Prior art keywords
molten glass
inflow pipe
pot
glass
section
Prior art date
Application number
PCT/JP2023/027277
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English (en)
Japanese (ja)
Inventor
周作 玉村
Original Assignee
日本電気硝子株式会社
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 日本電気硝子株式会社 filed Critical 日本電気硝子株式会社
Publication of WO2024038740A1 publication Critical patent/WO2024038740A1/fr

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    • 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

Definitions

  • the present invention relates to a method for manufacturing a glass article and an apparatus for manufacturing a glass article in which the mutual structure of a pot and a supply pipe for supplying molten glass to the pot is improved.
  • the molten glass flowing out of the melting furnace is supplied to a clarification container (fining tank), a stirring pot (stirring tank), and a conditioning pot (conditioning tank), and the molten glass flowing out from the conditioning pot is The molten glass is then transferred to a molding device.
  • Patent Document 1 discloses a configuration for flowing molten glass into pots (stirring pot and conditioning pot). Specifically, this document discloses a configuration for causing molten glass to flow into the inlet of the pot from an inflow pipe portion that is a downstream portion of a supply pipe that supplies molten glass into the pot.
  • the liquid level of the molten glass in the pot is maintained lower than the upper end of the inlet in order to suppress heterogeneity of the molten glass.
  • the present inventors have proposed providing a flange section including an electrode section and a cooling section in the inflow pipe section in order to adjust the temperature and viscosity of the molten glass in the supply pipe that supplies the molten glass to the pot. I tried. As a result, the present inventors found that in the configuration disclosed in Patent Document 1, devitrification is likely to occur in the molten glass within the inflow pipe section.
  • an object of the present invention is to suppress devitrification of molten glass within the inflow pipe section when a flange section including an electrode section and a cooling section is provided in the inflow pipe section leading to the inflow port of the pot. That's true.
  • the inflow pipe section is provided with a flange section that includes an electrode section and a cooling section, the temperature of the molten glass near the liquid surface will locally decrease on the inner surface of the flange section. Therefore, devitrification is likely to occur in the molten glass within the inlet pipe section.
  • the present invention which was created based on the above research results of the present inventors, has the following points (1) to (6).
  • a first aspect of the present invention provides a pot in which an inlet for molten glass is formed in a side wall portion and a liquid level of the molten glass inside is maintained lower than an upper end of the inlet; an inflow pipe section that is a downstream part of a supply pipe that supplies molten glass into the pot through the pot, and the molten glass that flows out through the outflow port provided below the inflow port of the pot is supplied to the molding device.
  • a method for manufacturing a glass article through a step of transferring the method comprising: providing a flange portion having an electrode portion and a cooling portion on the inflow pipe portion; and supplying molten glass over the entire circumference of the inner surface of the flange portion. Characterized by filling.
  • the inflow pipe part means a tubular part whose downstream end is a part connected to the side wall part of the pot, and whose upstream end is a removable part of the supply pipe closest to the pot.
  • the inflow pipe section leading to the inflow port is equipped with an electrode section and a cooling section.
  • the entire inner circumference of the flange portion is filled with molten glass.
  • the entire circumference of the inner surface of the flange portion can be appropriately filled with molten glass using a simple and effective configuration.
  • the upstream portion of the inflow pipe portion may be inclined upward from the upstream side toward the downstream side.
  • the upstream portion of the inflow pipe portion may be aligned in the horizontal direction.
  • the liquid level of the molten glass from the inside of the inflow pipe section to the inflow port is sloped downward from the upstream side to the downstream side, so that the liquid level in the inflow pipe section is lowered from the upstream side to the downstream side.
  • the liquid level of the molten glass may reach the upper end of the inner surface of the inflow pipe at a position downstream of the flange in the inflow pipe.
  • a second aspect of the present invention provides a pot in which an inlet for molten glass is formed in a side wall portion, and an inflow pipe that is a downstream portion of a supply pipe that supplies molten glass into the pot through the inlet. and a molding device to which molten glass flowing out through an outlet provided below the inlet of the pot is supplied, the apparatus comprising an electrode in the inflow pipe.
  • the apparatus comprising an electrode in the inflow pipe.
  • FIG. 1 is a schematic side view showing the overall configuration of a glass article manufacturing apparatus according to an embodiment of the present invention.
  • 1 is a longitudinal side view showing a first example of a characteristic configuration of a glass article manufacturing apparatus according to an embodiment of the present invention.
  • 1 is an enlarged vertical cross-sectional side view showing a main part of a first example of a characteristic configuration of a glass article manufacturing apparatus according to an embodiment of the present invention.
  • FIG. 2 is a longitudinal sectional front view showing an enlarged internal structure of a flange portion in a first example of a characteristic configuration of a glass article manufacturing apparatus according to an embodiment of the present invention.
  • FIG. 2 is a longitudinal side view showing a second example of the characteristic configuration of the glass article manufacturing apparatus according to the embodiment of the present invention.
  • FIG. 1 is a schematic side view illustrating a glass article manufacturing apparatus according to the present invention.
  • this manufacturing apparatus 1 can be roughly divided into a melting furnace 2 that is disposed at the upstream end and heats glass raw materials to produce molten glass Gm, and a melting furnace 2 that generates molten glass Gm flowing out from the melting furnace 2. It includes a transfer device 3 that transfers toward the downstream side, and a forming device 4 that forms a glass ribbon Gr using molten glass Gm supplied from the transfer device 3. The glass ribbon Gr formed by the forming device 4 is then cut in the width direction by a cutting device (not shown) to become a glass original plate.
  • a cutting device not shown
  • This glass original plate is further subjected to various post-processing processes, such as cutting it into a predetermined size, as necessary. As a result, a glass plate as a glass article is manufactured.
  • both ends of the width direction are cut
  • the transfer device 3 includes, in order from the upstream side, a clarification container 5 forming a clarification tank, a stirring pot 6 forming a stirring tank, a conditioning pot 7 forming a conditioning tank, and a liquid discharged from the conditioning pot 7.
  • An introduction pipe 8 to which molten glass Gm is supplied is provided.
  • Molten glass Gm flowing out from the melting furnace 2 is supplied to the clarification container 5 via the first supply pipe 9.
  • the molten glass Gm flowing out of the clarification container 5 is supplied to the stirring pot 6 via the second supply pipe 10.
  • the molten glass Gm flowing out from the stirring pot 6 is supplied to the conditioning pot 7 via a third supply pipe (cooling pipe) 11.
  • the fining container 5 is used to perform a fining process on the molten glass Gm produced in the melting furnace 2.
  • the stirring pot 6 is used to stir and homogenize the molten glass Gm that has been subjected to the clarification process.
  • the third supply pipe 11 is used to adjust the temperature, viscosity, etc. of the molten glass Gm that has been subjected to the homogenization process.
  • the condition adjustment pot 7 is used to further adjust the condition of the molten glass Gm whose temperature or viscosity has been adjusted, such as by further adjusting the temperature or viscosity or adjusting the flow rate. Note that a plurality of stirring pots 6 may be arranged on the transfer path of the transfer device 3.
  • the molding device 4 includes a molded body 12 that forms the molten glass Gm into a belt shape by flowing down the molten glass Gm by, for example, an overflow down-draw method. Molten glass Gm is introduced into the molded body 12 through the introduction pipe 8.
  • the glass ribbon Gr formed into a band shape is subjected to appropriate processing to become a glass original plate of desired dimensions.
  • a glass plate obtained from this original glass plate has a thickness of, for example, 0.01 to 2 mm, and is used as a glass substrate or cover glass for various displays such as liquid crystal displays and organic EL displays.
  • the molding device 4 may be one that executes another down-draw method such as the slot down-draw method, or may be one that executes a method other than the down-draw method, for example, a float method.
  • the molten glass is made of silicate glass or silica glass, preferably borosilicate glass, soda lime glass, or aluminosilicate glass (glass for chemical strengthening), and most preferably made of alkali-free glass.
  • alkali-free glass refers to glass that does not substantially contain alkali components (alkali metal oxides), and specifically, glass in which the weight ratio of alkali components is 3000 ppm or less. be.
  • the weight ratio of the alkali component in the present invention is preferably 1000 ppm or less, more preferably 500 ppm or less, and most preferably 300 ppm or less.
  • This characteristic configuration lies in the configuration between the third supply pipe 11 and the conditioning pot 7.
  • first to fourth examples of this characteristic configuration will be described in detail based on FIGS. 2 to 8.
  • FIG. 2 is a longitudinal side view showing a first example of the characteristic configuration.
  • the figure shows the main parts of the third supply pipe 11 (hereinafter simply referred to as the supply pipe 11), the conditioning pot 7 (hereinafter simply referred to as the pot 7), and the introduction pipe 8 (its upper end). This is an example.
  • the supply pipe 11 is composed of an inflow pipe section 11A, which is a downstream part thereof, and an upstream pipe part 11B, which is an upstream part of the inflow pipe part 11A.
  • the length of the supply pipe 11 is, for example, 1 m to 6 m, preferably 2 m to 4 m.
  • the length of the inflow pipe portion 11A is, for example, 0.3 m to 2 m, preferably 0.5 m to 1 m.
  • a flange portion 11Aa is provided at the upstream end of the inflow pipe portion 11A.
  • This flange portion 11Aa is removably joined and fixed to a flange portion 11Ba provided at the downstream end of the upstream pipe portion 11B. Note that the upstream end of the upstream pipe portion 11B is connected to the stirring pot 6 described above.
  • the pot 7 includes a side wall portion 7A.
  • the side wall portion 7A includes an upper wall portion 7Aa, an intermediate wall portion 7Ab, and a lower wall portion 7Ac.
  • the upper wall portion 7Aa has the same diameter from the upstream end to the downstream end.
  • the intermediate wall portion 7Ab is connected to the lower end of the upper wall portion 7Aa, and gradually decreases in diameter as it moves downward.
  • the lower wall portion 7Ac is connected to the lower end of the intermediate wall portion 7Ab and has the same diameter from the upstream end to the downstream end.
  • An outlet 7B through which the molten glass Gm flows out from the pot 7 is formed at the lower end of the lower wall 7Ac.
  • An inflow port 7C for the molten glass Gm is formed at an intermediate position in the vertical direction of the side wall portion 7A (upper wall portion 7Aa) of the pot 7. Further, the downstream end of the inflow pipe portion 11A is connected to the side wall portion 7A (upper wall portion 7Aa) of the pot 7 at the same position as above. Therefore, the internal passage of the inflow pipe portion 11A communicates with the inflow port 7C of the pot 7. In this case, the inflow pipe part 11A is connected to the side wall part 7A of the pot 7 so that its pipe axis passes through the center of the inflow port 7C.
  • the inflow pipe section 11A is defined as follows.In other words, the inflow pipe section 11A has a downstream end connected to the side wall section 7A of the pot 7, and a supply pipe 11A. This refers to a tubular portion whose upstream end is a removable portion closest to the pot 7 (a portion that can be detached from the upstream tube portion 11B during maintenance, etc.).
  • FIG. 3 is an enlarged vertical sectional side view showing the main parts of the first example.
  • the inflow pipe portion 11A is inclined upward from the upstream side toward the downstream side.
  • the inclination angle ⁇ of the inflow pipe portion 11A (specifically, its pipe axis) with respect to the horizontal plane is preferably 0.5 to 30°, more preferably 1 to 20°.
  • the tubular portion 11Ab of the inflow pipe portion 11A extends in a straight line and has the same diameter from the downstream end to the upstream end. Note that the downstream end of the upstream pipe portion 11B is located at a higher position than its upstream end.
  • the flange portion 11Aa of the inflow pipe portion 11A includes an electrode portion 11x and a cooling portion 11y.
  • FIG. 4 is a rear view of the flange portion 11Aa viewed from the downstream side toward the upstream side, and shows an example of the electrode portion 11x and the cooling portion 11y.
  • the electrode part 11x integrally projects upward from the upper part of the flange part 11Aa.
  • the cooling section 11y includes a flange section 11Aa and a cooling pipe 11ya fixed to the side surface of the electrode section 11x.
  • the cooling pipe 11ya has an annular portion 11yb and a pair of straight portions 11yc communicating with the annular portion 11yb.
  • the flange part 11Aa and the electrode part 11x are cooled, and the electrode part 11x is protected.
  • a cooling medium for example, water or air
  • the flange portion 11Ba of the upstream pipe portion 11B also includes an electrode portion 11x1 and a cooling portion 11y1 similar to this (see FIG. 3).
  • the liquid level L1 of the molten glass Gm in the pot 7 is maintained lower than the upper end 7Ca of the inlet 7C of the pot 7.
  • the liquid level L1 of this molten glass Gm is maintained higher than the lower end 7Cb of the inlet 7C.
  • the liquid level L2 of the molten glass Gm in the inflow pipe section 11A reaches the upper end of the inner surface 11Ac of the inflow pipe section 11A at a position P1 downstream of the flange section 11Aa. Therefore, the inner peripheral side of the flange portion 11Aa is filled with molten glass Gm over the entire circumference.
  • the liquid level L2 of the molten glass Gm is not formed on the inner surface side of the flange portion 11Aa, so that a local temperature drop of the molten glass Gm within the inflow pipe portion 11A can be prevented.
  • the inner peripheral side of the flange part 11Ba of the upstream pipe part 11B is also filled with the molten glass Gm over the entire circumference, the liquid level L2 of the molten glass Gm is not formed on the inner peripheral side of the flange part 11Ba. Therefore, it is possible to prevent a local temperature drop of the molten glass Gm within the inflow pipe portion 11A. As a result, devitrification of the molten glass Gm within the upstream pipe portion 11B is suppressed, and a high-quality glass plate with few defects can be obtained.
  • the upstream pipe portion 11B is provided with one or more flange portions (flange portions including an electrode portion and a cooling portion) in addition to the flange portion 11Ba shown in the figure.
  • the circumferential side is also filled with molten glass Gm over the entire circumference. Note that by controlling the current flowing into the supply pipe 11 through the electrode parts (including the electrode parts 11x and 11x1) of the plurality of flange parts (including the flange parts 11Aa and 11Ba) provided on the supply pipe 11, the inlet port 7C The temperature and viscosity of the molten glass Gm flowing into the pot 7 are adjusted through. Further, although not shown, the pot 7 is also provided with a plurality of flange portions each having an electrode portion and a cooling portion. By controlling the current flowing into the pot 7 through the electrode portions of these flange portions, the temperature, viscosity, flow rate, etc. of the molten glass Gm flowing out from the outlet 7B of the pot 7 are adjusted.
  • FIG. 5 is a vertical sectional side view for explaining the characteristic configuration and the method of manufacturing a glass plate using the same according to the second example
  • FIG. 6 is a vertical sectional side view showing an enlarged view of the main parts thereof.
  • This second example differs from the first example already described in that the inflow pipe section 11A is divided into a downstream section 11Ad and an upstream section 11Ae, and the downstream section 11Ad is directed from the upstream side to the downstream side.
  • the upstream portion 11Ae is located along the horizontal direction. Since the other configurations are the same as the first example described above, the same reference numerals are given to the components common to both examples in FIGS. 5 and 6, and the explanation thereof will be omitted. Also in this second example, as shown in FIG.
  • the inner peripheral side of the flange portion 11Aa is filled with molten glass Gm over the entire circumference. Therefore, according to this second example, the same effects as the first example described above can be enjoyed. Moreover, according to the second example, since the upstream portion 11Ae of the inflow pipe portion 11A is along the horizontal direction, the work of attaching and detaching both the flange portions 11Aa and 11Ba is facilitated.
  • FIG. 7 is a longitudinal sectional side view showing an enlarged main part for explaining the characteristic structure and the method of manufacturing a glass plate using the same according to the third example.
  • This third example differs from the first example already described in that the liquid level L2 of the molten glass Gm in the inflow pipe portion 11A is sloped downward by an angle ⁇ from the upstream side to the downstream side. be.
  • This angle ⁇ is preferably 2 to 20 degrees, more preferably 5 to 15 degrees. Since the other configurations are the same as the first example described above, the same reference numerals are given to the components common to both examples in FIG. 7, and the explanation thereof will be omitted.
  • the position P1 where the liquid level L2 of the molten glass Gm in the inflow pipe part 11A reaches the upper end of the inner surface 11Ac of the inflow pipe part 11A is set downstream from the flange part 11Aa than in the first example described above. You can move it away to the side. Thereby, it becomes possible to reduce the temperature drop of the molten glass Gm in the inflow pipe portion 11A compared to the case of the first example described above.
  • this third example allows the liquid level L2 of the molten glass Gm in the inflow pipe portion 11A to be tilted downward from the upstream side to the downstream side is as follows. That is, in order to maintain the liquid level L1 of the molten glass Gm in the pot 7 lower than the upper end 7Ca of the inlet 7C, the temperature of the molten glass Gm flowing into the pot 7 through the inlet 7C is lowered to reduce its viscosity. and/or the temperature of the molten glass Gm flowing out from the pot 7 through the outlet 7B is increased to lower its viscosity.
  • FIG. 8 is a longitudinal sectional side view showing an enlarged main part for explaining the characteristic structure and the method of manufacturing a glass plate using the same according to the fourth example.
  • This fourth example differs from the first example already described in that the inflow pipe section 11A is horizontally aligned along the entire length from the upstream side part to the downstream side part, and the inside of the inflow pipe part 11A is The liquid level L2 of the molten glass Gm is inclined downward by an angle ⁇ from the upstream side to the downstream side. Since the other configurations are the same as the first example described above, the same reference numerals are given to the components common to both examples in FIG. 8, and the explanation thereof will be omitted.
  • the inner peripheral side of the flange portion 11Aa of the inflow pipe portion 11A is filled with molten glass Gm over the entire circumference (the same applies to the flange portion 11Ba of the upstream pipe portion 11B).
  • molten glass Gm over the entire circumference
  • the present invention is applied to the configuration between the third supply pipe 11 and the conditioning pot 7 and the method of manufacturing a glass plate using the same, but the second supply pipe 10 and the stirring pot The present invention can be applied in the same manner to the structure between the glass plate 6 and the glass plate manufacturing method using the same.
  • the shape of the upstream pipe section 11B in the above embodiments is not limited to the shape shown in the figure, but may be any other shape as long as its downstream end is connected to the upstream end of the inflow pipe section 11A. It is preferable that the downstream end of the upstream pipe portion 11B be located at a higher position than its upstream end.
  • the configuration of the cooling part 11y included in the flange part 11Aa in the above embodiment is not limited to that shown in FIG. Good too.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)

Abstract

Ce procédé est destiné à la fabrication d'un article en verre à l'aide d'un dispositif de fabrication 1 comprenant : un pot 7 dans lequel une ouverture d'entrée 7C pour du verre fondu Gm est formée dans une partie paroi latérale 7A et dans laquelle le niveau de liquide L1 du verre fondu Gm à l'intérieur est maintenu plus bas que l'extrémité supérieure 7Ca de l'ouverture d'entrée 7C ; et une partie tube d'entrée 11A pour amener le verre fondu Gm à s'écouler à l'intérieur du pot 7 à travers l'ouverture d'entrée 7C. La partie tube d'entrée 11A est pourvue d'une bride 11Aa ayant une partie électrode 11x et une partie de refroidissement 11y disposées à l'intérieur de celle-ci. Le verre fondu Gm est chargé sur toute la circonférence sur le côté de surface interne de la bride 11Aa.
PCT/JP2023/027277 2022-08-19 2023-07-25 Procédé de fabrication d'article en verre et dispositif de fabrication d'article en verre WO2024038740A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-131102 2022-08-19
JP2022131102 2022-08-19

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006132043A1 (fr) * 2005-06-06 2006-12-14 Asahi Glass Company, Limited Dispositif de fabrication de verre, composant de celui-ci et procédé pour chauffer par conduction un tel composant
JP2017014067A (ja) * 2015-07-01 2017-01-19 日本電気硝子株式会社 ガラス物品の製造方法
JP2018131345A (ja) * 2017-02-13 2018-08-23 日本電気硝子株式会社 ガラス製造方法、及びガラス供給管の予熱方法
WO2019146446A1 (fr) * 2018-01-29 2019-08-01 日本電気硝子株式会社 Procédé et dispositif de fabrication d'un article en verre
WO2019230340A1 (fr) * 2018-05-28 2019-12-05 日本電気硝子株式会社 Procédé et appareil de fabrication d'un article en verre
WO2020129528A1 (fr) * 2018-12-21 2020-06-25 日本電気硝子株式会社 Procédé de fabrication d'article en verre
WO2021002260A1 (fr) * 2019-07-03 2021-01-07 日本電気硝子株式会社 Procédé de fabrication d'article en verre et dispositif de fabrication d'article en verre
CN213295154U (zh) * 2020-04-10 2021-05-28 彩虹集团有限公司 一种铂金通道结构
JP2021169383A (ja) * 2020-04-14 2021-10-28 日本電気硝子株式会社 ガラス物品の製造方法及びガラス物品の製造装置

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006132043A1 (fr) * 2005-06-06 2006-12-14 Asahi Glass Company, Limited Dispositif de fabrication de verre, composant de celui-ci et procédé pour chauffer par conduction un tel composant
JP2017014067A (ja) * 2015-07-01 2017-01-19 日本電気硝子株式会社 ガラス物品の製造方法
JP2018131345A (ja) * 2017-02-13 2018-08-23 日本電気硝子株式会社 ガラス製造方法、及びガラス供給管の予熱方法
WO2019146446A1 (fr) * 2018-01-29 2019-08-01 日本電気硝子株式会社 Procédé et dispositif de fabrication d'un article en verre
WO2019230340A1 (fr) * 2018-05-28 2019-12-05 日本電気硝子株式会社 Procédé et appareil de fabrication d'un article en verre
WO2020129528A1 (fr) * 2018-12-21 2020-06-25 日本電気硝子株式会社 Procédé de fabrication d'article en verre
WO2021002260A1 (fr) * 2019-07-03 2021-01-07 日本電気硝子株式会社 Procédé de fabrication d'article en verre et dispositif de fabrication d'article en verre
CN213295154U (zh) * 2020-04-10 2021-05-28 彩虹集团有限公司 一种铂金通道结构
JP2021169383A (ja) * 2020-04-14 2021-10-28 日本電気硝子株式会社 ガラス物品の製造方法及びガラス物品の製造装置

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