WO2013088894A1 - Procédé de moulage de feuille de verre flotté et dispositif de moulage de feuille de verre flotté - Google Patents

Procédé de moulage de feuille de verre flotté et dispositif de moulage de feuille de verre flotté Download PDF

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Publication number
WO2013088894A1
WO2013088894A1 PCT/JP2012/079407 JP2012079407W WO2013088894A1 WO 2013088894 A1 WO2013088894 A1 WO 2013088894A1 JP 2012079407 W JP2012079407 W JP 2012079407W WO 2013088894 A1 WO2013088894 A1 WO 2013088894A1
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WO
WIPO (PCT)
Prior art keywords
heat generating
generating portion
refrigerant pipe
molten metal
molten
Prior art date
Application number
PCT/JP2012/079407
Other languages
English (en)
Japanese (ja)
Inventor
正信 白井
近藤　晃
誠也 野仲
大樹 秋江
Original Assignee
旭硝子株式会社
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 旭硝子株式会社 filed Critical 旭硝子株式会社
Priority to KR1020147013846A priority Critical patent/KR20140107210A/ko
Priority to CN201280061967.XA priority patent/CN103998384A/zh
Publication of WO2013088894A1 publication Critical patent/WO2013088894A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B18/00—Shaping glass in contact with the surface of a liquid
    • C03B18/02—Forming sheets
    • C03B18/18—Controlling or regulating the temperature of the float bath; Composition or purification of the float bath
    • 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
    • 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 method for forming a float glass plate and a device for forming a float glass plate.
  • the method for forming a float glass plate is to form a strip by flowing molten glass continuously supplied onto molten metal (for example, molten tin) in a bathtub on the molten metal.
  • molten metal for example, molten tin
  • the molten glass gradually decreases in temperature while flowing in a predetermined direction on the molten metal, and becomes a temperature at which the molten glass can be pulled up from the molten metal.
  • the glass pulled up from the molten metal is gradually cooled in a slow cooling furnace and then cut into a predetermined size and shape to obtain a product float glass plate.
  • Patent Document 1 A technique for supplying hydrogen gas into molten tin has been proposed (for example, see Patent Document 1).
  • a supply pipe supplying hydrogen gas is submerged in the molten tin.
  • the supply pipe is composed of a double pipe, and the refrigerant flows in the annular space between the outer cylinder and the inner cylinder constituting the double pipe, and the hydrogen gas flows in the inner space of the inner cylinder. .
  • the amount of molten glass supplied into the bathtub increases. For this reason, since the temperature becomes higher at the most upstream part of the molten metal, the saturated concentration of the dissolved gas component becomes higher, and the actual concentration of the dissolved gas component becomes higher. Accordingly, the gas is supersaturated in the process of gradually decreasing the temperature while the molten metal flows together with the molten glass, and bubbles are generated in the molten metal. When the bubbles rise to the lower surface of the molten glass, a concave defect is formed on the bottom surface of the float glass plate.
  • This invention was made in view of the said subject, Comprising: It aims at provision of the shaping
  • a method for forming a float glass sheet according to an aspect of the present invention includes: In the method for forming a float glass plate in which molten glass continuously supplied onto the molten metal in the bathtub is flowed on the molten metal and formed into a strip shape, The most upstream part of the molten metal is cooled by a first refrigerant pipe disposed outside the molten metal, The first refrigerant pipe is disposed at a position that does not overlap the molten glass in a top view.
  • the first refrigerant pipe is placed on a side wall of the bathtub.
  • the refrigerant flowing in the first refrigerant pipe is water.
  • a plurality of heat generating portions for heating the molten glass is provided above the molten metal, and the plurality of heat generating portions are divided into a plurality of heat generating portion groups, and output control is performed.
  • the heat generating part group forms a heat generating part array side by side in the width direction of the molten glass, and a plurality of the heat generating part arrays are aligned in the flow direction of the molten glass, and each of the heat generating part arrays included in the most upstream heat generating part array
  • the output of the heat generating part is set smaller when the second refrigerant pipe for cooling the molten glass is arranged between the uppermost heat generating part row and the molten glass compared to the case where the second refrigerant pipe is not arranged. It is preferable.
  • the second exothermic part row from the upstream side is composed of three or more exothermic part groups, and among the three or more exothermic part groups, in each exothermic part group other than the exothermic part group, The output of the heat generating part is set smaller when the second refrigerant pipe is arranged than when the second refrigerant pipe is not arranged.
  • the second heat generating part from the upstream side is set.
  • the output of each heat generating part included in the heat generating part group at both ends is set larger than the output of each heat generating part included in the heat generating part group other than the heat generating part group at both ends.
  • a float glass sheet molding apparatus includes: In a forming apparatus for a float glass plate, comprising a bathtub containing molten metal, and flowing molten glass continuously supplied onto the molten metal in the bathtub to form a belt plate shape on the molten metal, A first refrigerant pipe that is disposed outside the molten metal and cools the most upstream part of the molten metal; The first refrigerant pipe is disposed at a position that does not overlap the molten glass in a top view.
  • the first refrigerant pipe is placed on a side wall of the bathtub.
  • the refrigerant flowing in the first refrigerant pipe is water.
  • a plurality of heat generating portions for heating the molten glass are provided above the molten metal, and the plurality of heat generating portions are divided into a plurality of heat generating portion groups, and output control is performed.
  • the heat generating part group forms a heat generating part array side by side in the width direction of the molten glass, and a plurality of the heat generating part arrays are aligned in the flow direction of the molten glass, and each of the heat generating part arrays included in the most upstream heat generating part array
  • the output of the heat generating part is preferably set smaller than when not arranged.
  • the second exothermic part row from the upstream side is composed of three or more exothermic part groups, and among the three or more exothermic part groups, in each exothermic part group other than the exothermic part group, The output of the heat generating part is set smaller when the second refrigerant pipe is arranged than when the second refrigerant pipe is not arranged.
  • the second heat generating part from the upstream side is set.
  • the output of each heat generating part included in the heat generating part group at both ends is set larger than the output of each heat generating part included in the heat generating part group other than the heat generating part group at both ends.
  • a float glass plate forming method and a float glass plate forming apparatus capable of reducing defects on the bottom surface.
  • FIG. 1 is a cross-sectional view taken along the line II of FIG. 2 showing a float glass sheet forming apparatus according to an embodiment of the present invention.
  • 2 is a cross-sectional view taken along the line II-II in FIG.
  • FIG. 3 is a top view showing a positional relationship among the heat generating unit group, the first and second cooling pipes, and the top roll.
  • FIG. 1 is a cross-sectional view taken along the line II of FIG. 2 showing a float glass sheet forming apparatus according to an embodiment of the present invention.
  • 2 is a cross-sectional view taken along the line II-II in FIG.
  • the forming apparatus 10 includes a bathtub 22 that accommodates a molten metal (for example, molten tin) M.
  • a molten metal for example, molten tin
  • the float bath 20 is composed of a bathtub 22, an annular upper side wall 24 installed along the outer peripheral upper edge of the bathtub 22, a ceiling 26 connected to the upper side wall 24 and covering the upper side of the bathtub 22.
  • a gas supply path 30 for supplying a reducing gas to a space 28 in the float bath 20 is provided on the ceiling 26, a gas supply path 30 for supplying a reducing gas to a space 28 in the float bath 20 is provided.
  • a heater 32 is inserted into the gas supply path 30, and a heat generating portion 32 a of the heater 32 is disposed in the space 28 in the float bath 20.
  • the gas supply path 30 supplies a reducing gas to the space 28 in the float bath 20 in order to prevent the molten metal M from being oxidized.
  • the reducing gas contains, for example, 85 to 99% by volume of nitrogen gas and 1 to 15% by volume of hydrogen gas.
  • the space 28 in the float bath 20 is set to a pressure higher than the atmospheric pressure in order to prevent air from being mixed in through a gap between bricks constituting the upper side wall 24.
  • the plurality of heaters 32 heat the molten glass G passing below under the control of the control device 34.
  • the molten glass G gradually decreases in temperature while flowing in a predetermined direction on the molten metal M, and reaches a temperature at which the molten glass G can be pulled up from the molten metal M.
  • the molding apparatus 10 further includes a top roll 40 that supports the molten glass G in order to suppress the molten glass G from shrinking in the width direction on the molten metal M.
  • a plurality of pairs (only one pair is shown in FIG. 2) of the top roll 40 are arranged on both sides of the molten glass G in the width direction, and tension is applied to the molten glass G in the width direction.
  • the top roll 40 has a rotating member 41 in contact with the molten glass G at the tip.
  • the rotating member 41 bites into the upper surface of the molten glass G and supports the end in the width direction of the molten glass G so that the molten glass G does not shrink in the width direction.
  • the rotating member 41 rotates, the molten glass G is sent out in a predetermined direction.
  • the forming apparatus 10 includes a first refrigerant pipe 50 that cools the most upstream part of the molten metal M and a second refrigerant pipe 60 that cools the most upstream part of the molten glass G.
  • the first and second refrigerant tubes 50, 60 are used when the amount of molten glass G supplied into the bathtub 22 is large and the amount of heat that the molten glass G brings into the bathtub 22 is large.
  • the first and second refrigerant pipes 50, 60 it is possible to limit the temperature rise of the most upstream part of the molten metal M and the temperature of the most upstream part of the molten glass G.
  • the first refrigerant pipe 50 exchanges heat with the most upstream part of the molten metal M to cool the most upstream part of the molten metal M.
  • the first refrigerant pipe 50 is disposed outside the molten metal M in order to prevent erosion by the molten metal M.
  • 1st refrigerant pipe 50 is arranged in the position which does not overlap with molten glass G in the top view. That is, the first refrigerant pipe 50 is disposed on the side of the molten glass G in a top view. Therefore, the most upstream part of the molten metal M can be selectively cooled. Since the temperature is lowered at the most upstream part of the molten metal M, the saturated concentration of dissolved gas components (oxygen, hydrogen, water, etc.) is lowered, and the actual concentration of dissolved gas components is lowered. Therefore, it is possible to suppress the supersaturated precipitation of the gas in the process of the molten metal M flowing together with the molten glass G and becoming a low temperature. As a result, since the amount of bubbles contained in the molten metal M can be reduced, the depression of the bottom surface of the float glass plate can be reduced.
  • the saturated concentration of dissolved gas components oxygen, hydrogen, water, etc.
  • the first refrigerant pipe 50 is placed on the side wall portion 23 of the bathtub 22, and for example, as shown in FIG.
  • a plurality of first refrigerant tubes 50 may be stacked on the side wall portion 23 for the purpose of increasing the cooling efficiency.
  • tube 50 since the 1st refrigerant
  • tube 50 may be provided away from the side wall part 23, and the 1st refrigerant
  • the first refrigerant pipe 50 is composed of an outgoing pipe 51 and a return pipe 52.
  • the forward path pipe 51 and the return path pipe 52 penetrate the upper side wall 24, extend along the side wall portion 23 of the bathtub 22, and are connected at the tip.
  • the refrigerant flowing through the first refrigerant pipe 50 passes through the forward pipe 51, passes through the return pipe 52, and is discharged to the outside of the float bath 20.
  • the refrigerant discharged to the outside may be cooled by a cooler and returned to the first refrigerant pipe 50 again.
  • the forward pipe 51 may be disposed closer to the molten metal M than the backward pipe 52.
  • a liquid such as water or a gas such as air is used.
  • water having a large specific heat and excellent heat transfer efficiency is preferable. Water is also excellent in terms of cost.
  • the second refrigerant pipe 60 cools the most upstream part of the molten glass G.
  • the second refrigerant pipe 60 is provided above the molten glass G and is disposed between the molten glass G and the heater 32.
  • the second refrigerant pipe 60 is disposed away from the side wall portion 23 of the bathtub 22 so as not to cool the molten metal M as much as possible.
  • the temperature of the molten metal M and the temperature of the molten glass G can be adjusted independently.
  • the second refrigerant pipe 60 absorbs heat radiated from the molten glass G. The absorbed heat is conveyed to the outside by the refrigerant flowing through the second refrigerant pipe 60.
  • the second refrigerant pipe 60 is arranged in parallel with the width direction of the molten glass G.
  • the pair of second refrigerant tubes 60 penetrates the pair of opposing walls 24 a and 24 b constituting the upper side wall 24, and the ends thereof face each other above the center portion in the width direction of the molten glass G. Therefore, the molten glass G can be cooled over substantially the entire width direction.
  • the length of the 2nd refrigerant pipe 60 is short compared with the width
  • the second refrigerant pipe 60 is composed of a forward pipe and a backward pipe (not shown), like the first refrigerant pipe 50.
  • the forward pipe and the backward pipe penetrate the upper side wall 24, are arranged in parallel with the width direction of the molten glass G, and are connected at the tip.
  • the refrigerant flowing through the second refrigerant pipe 60 passes through the outward pipe, passes through the return pipe, and is discharged to the outside of the float bath 20.
  • the refrigerant discharged to the outside may be cooled by a cooler and returned to the second refrigerant pipe 60 again.
  • the refrigerant flowing through the second refrigerant pipe 60 a liquid such as water or a gas such as air is used.
  • the refrigerant flowing through the second refrigerant pipe 60 and the refrigerant flowing through the first refrigerant pipe 50 are preferably supplied from the same refrigerant supply source.
  • the forming apparatus 10 forms a strip plate by causing the molten glass G continuously supplied onto the molten metal M to flow on the molten metal M.
  • the molten glass G is supported by the top roll 40 so as not to shrink in the width direction.
  • the molten glass G gradually decreases in temperature while flowing in a predetermined direction, and reaches a temperature at which it can be pulled up from the molten metal M.
  • the temperature in the float bath 20 is adjusted by the plurality of heaters 32 and the first and second refrigerant tubes 50 and 60.
  • the molten glass G is pulled up from the molten metal M by a lift-out roll, and is gradually cooled in a slow cooling furnace to become a sheet glass.
  • the plate-like glass is carried out of the slow cooling furnace, it is cut into a predetermined size and shape by a cutting machine to become a product float glass plate.
  • the float glass plate may be a glass substrate for a display such as a liquid crystal display (LCD), a plasma display (PDP), or an organic EL display.
  • a float glass plate may be a window glass for vehicles, a window glass for buildings, etc., and is not specifically limited.
  • the type of glass on the float glass plate is selected according to the application.
  • a glass substrate for LCD alkali-free glass is used.
  • aluminosilicate glass is used in the case of a glass substrate for PDP.
  • FIG. 3 is a top view showing a positional relationship among the heat generating portion group, the first and second cooling pipes, and the top roll.
  • L indicates a dividing line that divides the plurality of heat generating portions 32a into a plurality of heat generating portion groups 111 to 115, 121 to 125.
  • the output control of the plurality of heat generating portions 32a may be performed one by one, it is preferable that the output control is performed separately for the plurality of heat generating portion groups 111 to 115 and 121 to 125 in order to facilitate output control.
  • the plurality of heat generating unit groups 111 to 115 and 121 to 125 may be arranged symmetrically about the center line in the width direction of the molten glass G.
  • the heat generating portion groups 111 to 115 form a heat generating portion row 110 that is aligned in the width direction of the molten glass G.
  • the heat generating portion groups 121 to 125 form a heat generating portion row 120 aligned in the width direction of the molten glass G.
  • a plurality of heat generating portion rows 110 to 120 are arranged in the flow direction of the molten glass G.
  • the number of the heating part rows 110 and 120 is, for example, 4 to 15 (only two are shown in FIG. 3).
  • the number of heat generating unit groups included in each of the heat generating unit rows 110 and 120 is, for example, 4 to 15.
  • the number of heating unit groups included in each heating unit row 110, 120 may be different for each heating unit row 110, 120, or may be the same.
  • Each of the heat generating unit groups 111 to 115 and 121 to 125 includes a plurality of heat generating units 32a, and the same power is supplied to the plurality of heat generating units 32a constituting one heat generating unit group (for example, the heat generating unit group 111). .
  • the power supplied to each heat generating part 32a is set for each heat generating part group 111-115, 121-125.
  • the plurality of heat generating portions 32a are output-controlled by being divided into a plurality of heat generating portion groups 111 to 115 and 121 to 125. Output control of the plurality of heat generating units 32 a is performed by the control device 34.
  • the control device 34 is composed of, for example, a microcomputer including a CPU, ROM, RAM, and the like.
  • the control device 34 controls the output of the plurality of heat generating units 32a by causing the CPU to execute a program recorded in a ROM or the like.
  • each heat generating part 32a included in the most upstream heat generating part row 110 is obtained when the second refrigerant pipe 60 for cooling the molten glass G is disposed between the most upstream heat generating part array 110 and the molten glass G (FIG. 1 and FIG. 3), it is set smaller than the case where the second refrigerant pipe 60 is not disposed, for example, 0 (W). Therefore, the cooling by the second refrigerant pipe 60 can be performed efficiently.
  • the second exothermic part row 120 from the upstream side is composed of three or more (in this embodiment, five) exothermic part groups 121-125.
  • the output of each heat generating part 32a is when the second refrigerant pipe 60 is disposed ( 1 and FIG. 3), it is set smaller than the case where the second refrigerant pipe 60 is not disposed, and is set to 0 (W), for example. Therefore, cooling by the second refrigerant pipe 60 can be performed more efficiently.
  • the outputs of the heat generating portions 32a included in the heat generating portion groups 121 and 125 at both ends are as follows.
  • the output is set to be larger than the output of each heat generating part 32a included in the heat generating part groups 122 to 124 other than the heat generating part groups 121 and 125 at both ends.
  • the second refrigerant pipe 60 when the second refrigerant pipe 60 is disposed, it is preferable to dispose the most upstream top roll 40 below the second heat generating portion row 120 from the upstream side. Since the temperature distribution in the width direction of the molten glass G is made uniform below the second heat generating portion row 120 from the upstream side, the tension in the width direction applied to the molten glass G by the top roll 40 is stabilized. To do.
  • output control of the heat generating section 32a is performed based on the temperature in the float bath 20, for example.
  • the first refrigerant pipe 50 and the second refrigerant pipe 60 are used in combination, but each may be used alone. That is, the first refrigerant pipe 50 may be used alone, or the second refrigerant pipe 60 may be used alone.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Melting And Manufacturing (AREA)
  • Furnace Details (AREA)

Abstract

La présente invention concerne un procédé permettant de mouler une feuille de verre flotté selon lequel du verre fondu apporté en continu sur du métal fondu dans un bain s'écoule sur le métal fondu et prend la forme d'une bande de verre, une partie supérieure de l'écoulement de métal fondu étant refroidie par un premier tube frigorifique disposé à l'extérieur du métal fondu et le premier tube frigorifique étant disposé dans une position qui ne se superpose pas avec le verre fondu en vue du dessus.
PCT/JP2012/079407 2011-12-15 2012-11-13 Procédé de moulage de feuille de verre flotté et dispositif de moulage de feuille de verre flotté WO2013088894A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020147013846A KR20140107210A (ko) 2011-12-15 2012-11-13 플로트 유리판의 성형 방법 및 플로트 유리판의 성형 장치
CN201280061967.XA CN103998384A (zh) 2011-12-15 2012-11-13 浮法玻璃板的成型方法以及浮法玻璃板的成型装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-274399 2011-12-15
JP2011274399 2011-12-15

Publications (1)

Publication Number Publication Date
WO2013088894A1 true WO2013088894A1 (fr) 2013-06-20

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PCT/JP2012/079407 WO2013088894A1 (fr) 2011-12-15 2012-11-13 Procédé de moulage de feuille de verre flotté et dispositif de moulage de feuille de verre flotté

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JP (1) JPWO2013088894A1 (fr)
KR (1) KR20140107210A (fr)
CN (1) CN103998384A (fr)
TW (1) TW201323359A (fr)
WO (1) WO2013088894A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11689309B2 (en) 2013-07-11 2023-06-27 Nec Corporation Optical reception apparatus and monitor signal generating method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS501570B1 (fr) * 1969-04-22 1975-01-20
JPS5045059Y1 (fr) * 1974-12-11 1975-12-20
JPH03193631A (ja) * 1989-12-22 1991-08-23 Nippon Sheet Glass Co Ltd フロート板硝子製造装置
JPH1111959A (ja) * 1997-06-13 1999-01-19 Ppg Ind Inc 板ガラスの製造方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1096770A (zh) * 1993-06-21 1994-12-28 秦皇岛玻璃研究院 生产1.5～19mm浮法玻璃的成型方法及装置
WO2009054411A1 (fr) * 2007-10-25 2009-04-30 Asahi Glass Co., Ltd. Procédé de fabrication du verre à vitre

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS501570B1 (fr) * 1969-04-22 1975-01-20
JPS5045059Y1 (fr) * 1974-12-11 1975-12-20
JPH03193631A (ja) * 1989-12-22 1991-08-23 Nippon Sheet Glass Co Ltd フロート板硝子製造装置
JPH1111959A (ja) * 1997-06-13 1999-01-19 Ppg Ind Inc 板ガラスの製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11689309B2 (en) 2013-07-11 2023-06-27 Nec Corporation Optical reception apparatus and monitor signal generating method

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Publication number Publication date
TW201323359A (zh) 2013-06-16
JPWO2013088894A1 (ja) 2015-04-27
KR20140107210A (ko) 2014-09-04
CN103998384A (zh) 2014-08-20

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