WO2007132590A1 - 溶融ガラスの泡除去方法および除去装置、並びにガラスの製造方法 - Google Patents
溶融ガラスの泡除去方法および除去装置、並びにガラスの製造方法 Download PDFInfo
- Publication number
- WO2007132590A1 WO2007132590A1 PCT/JP2007/055144 JP2007055144W WO2007132590A1 WO 2007132590 A1 WO2007132590 A1 WO 2007132590A1 JP 2007055144 W JP2007055144 W JP 2007055144W WO 2007132590 A1 WO2007132590 A1 WO 2007132590A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- molten glass
- laser beam
- bubbles
- floating
- glass
- Prior art date
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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
- C03B5/225—Refining
-
- 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 removing bubbles generated during glass melting, and more particularly to a method for removing floating bubbles on the surface of molten glass.
- a glass substrate has been manufactured by melting a glass raw material at a high temperature, sufficiently stirring the molten glass, and then forming the molten glass into a flat plate shape and cooling, but when the raw material is melted, Many bubbles are generated in the molten glass.
- Patent Document 1 JP 2004-91307 A
- Patent Document 2 Japanese Patent Laid-Open No. 11-349335
- the present invention has been made in view of the above circumstances, and uses a method for efficiently removing bubbles remaining on the surface of a molten glass at the time of manufacturing a glass substrate, a bubble removing apparatus, and the bubble removing method.
- An object of the present invention is to provide a method for producing a glass.
- the present invention is a method for removing floating bubbles on the surface of a molten glass, characterized by irradiating the floating bubbles on the surface of the molten glass with at least one laser beam.
- a method for removing bubbles from molten glass is provided.
- the laser beam is irradiated to the molten glass surface at 45 ° or more. It is preferable.
- the laser beam preferably has a wavelength of 3 to: L 1 m.
- the irradiation area of the laser beam on the surface of the molten glass on the floating bubble is defined as lZe 2 (e is a natural logarithm) where the energy density distribution of the laser beam irradiation part in the floating bubble is maximum.
- lZe 2 e is a natural logarithm
- the average power density of the laser beam irradiating the floating bubble and the average power density of the laser beam defined by the Z irradiation area is 5 ⁇ 50, 000, OOOWZcm 2 is preferred.
- the irradiation area of the floating bubble of the laser beam is equal to or less than a projected cross-sectional area of the floating bubble.
- the repetition frequency of the laser beam is 0.1 Hz or more and that the laser beam is irradiated for at least 0.05 seconds or more.
- the laser beam is accelerated with respect to floating bubbles on the surface of the molten glass.
- the present invention includes a mechanism that irradiates at least one laser beam to floating bubbles on the surface of the molten glass at 45 ° or more with respect to the surface of the molten glass, and a laser beam relative to the floating bubbles of the molten glass.
- a device for removing floating bubbles on the surface of a molten glass comprising a scanning mechanism.
- the present invention is a glass characterized in that after the glass raw material is melted, floating bubbles remaining on the surface of the molten glass are removed by the molten glass bubble removing method, and then the molten glass is molded and solidified. A manufacturing method is provided.
- FIG. 1 is a schematic cross-sectional view for explaining a foam removal method according to the present invention.
- FIG. 2 is a partial schematic perspective view illustrating the method for removing bubbles according to the present invention.
- FIG. 3 is a schematic diagram for explaining the principle of the bubble removing method according to the present invention.
- FIG. 4 is a schematic explanatory diagram of a foam removing device according to the present invention.
- the gas component contained in the bubbles present on the surface of the molten glass to be removed is not particularly limited, and the glass material constituting the molten glass is not particularly limited. Therefore, the method of the present invention is applicable to almost all glass materials.
- the removal of bubbles in the present invention includes the reduction of bubbles.
- FIG. 1 is a schematic cross-sectional view illustrating a method for removing bubbles according to the present invention
- FIG. 2 is a partial schematic perspective view illustrating a method for removing bubbles according to the present invention
- FIG. It is a schematic diagram explaining the principle of the bubble removal method.
- the bubble removing method of the present invention irradiates a floating bubble 3 on the surface of a molten glass 2 melted in a melting tank 1 with a laser beam 4 generated by a laser light source 8.
- the laser beam 4 is generated by the laser light source 8, and the path is changed by the mirror 9 installed on the upper part of the laser beam introduction window 6, and passes through the lens 7 to form a desired cross section of the laser beam 4.
- the bubbles on the surface of the molten glass 2 are irradiated through a laser beam introduction window 6 installed in the melting tank 1.
- the laser light source 8 be installed in a place not affected by the temperature of the dissolution tank 1 or provided with a cooling device. It is also installed at the top of dissolution tank 1. Considering heat dissipation from the laser beam introduction window 6 and maintenance of the laser beam introduction window 6, the laser light source 8 does not irradiate the laser beam 4 as an output directly into the dissolution tank 1, and the laser beam introduction window 6 It is preferable to install it at a position where it can be irradiated through the mirror 9 installed on the top of the lens.
- the mirror 9 is preferably a gold-coated mirror, but the power reduction of the laser beam 4 due to the reflection that is hardly affected by the heat radiation from the laser beam introduction window 6 can secure the power necessary for breaking the floating bubble 3. It is preferable to provide a mechanism that can be adjusted in accordance with the installation angle of the laser light source 8 and the installation angle of the irradiating unit 4 that are not specified as long as they are specified. Furthermore, it is preferable to provide an angle adjustment mechanism that can adjust the irradiation position to the floating bubble 3 at any position on the surface of the molten glass 2!
- the lens 7 can form the laser beam 4 from the laser light source 8 into the desired laser beam 4 and a desired laser output can be obtained at the position of the floating bubble 3, its shape,
- the material is not specified. Further, the configuration may be one or more according to the focal length.
- the material of the laser beam introduction window 6 is preferably made of zinc selenide (ZnSe) which is not easily affected by radiant heat and is an infrared transmitting material. However, it is difficult to absorb a laser beam having a low pulse frequency. If the property is good, the material is not specified.
- the laser beam introduction window 6 only needs to be able to irradiate the inside of the dissolution tank 1 with the laser beam 4 while maintaining the atmosphere of the dissolution tank 1, so that there is no problem even if the laser beam irradiation part is open due to the structure of the dissolution tank. It can be omitted.
- the laser beam 4 is irradiated so that the angle A with respect to the surface of the molten glass 2 is 45 ° or more. If the irradiation angle A to the surface of the molten glass 2 is smaller than 45 °, the cross section of the laser beam 4 on the surface of the molten glass 2 becomes too large and the desired width may not be obtained. It is more preferable to irradiate at 55 ° or more.
- the principle of bubble removal by the method of the present invention is considered as follows.
- Fig. 3 (a) when the laser beam 4 is applied to the floating bubble 3 on the surface of the molten glass 2, the bubble wall of the floating bubble 3 absorbs the laser beam 4, and the floating bubble 3 partially A temperature rise is induced. Therefore, as shown in Fig. 3 (b), the glass surface, density and surface Fluctuations 10 such as tension occur locally.
- Fig. 3 (c) the floating bubble 3 starts with the fluctuation 10 and the bubble break 11 occurs.
- Floating bubbles 3 partially fluctuate 10 and breakage bubbles 11 are due to the fact that the molten glass 2 is above the melting temperature and is negligibly small relative to the surface area of the molten glass 2, so that when the glass 2 is molded or solidified Does not adversely affect molten glass 2
- the laser beam 4 preferably has a wavelength of 3 to 11 microns. If the wavelength is shorter than 3 microns, the floating bubble 3 remaining on the surface of the molten glass 2 The bubble wall force of the molten glass 2 S The laser beam 4 is not absorbed, and the bubble wall of the floating bubble 3 may not be heated sufficiently. is there. If it is longer than 11 microns, it is difficult to obtain a laser device, which is not practical.
- the irradiation area S 4 of the floating glass 3 on the surface of the molten glass 2 of the laser beam 4 is the portion where the energy density distribution of the cross section of the laser beam 4 in the floating bubble 3 is the maximum lZe 2
- the average power density defined by the average power Z irradiation area of the irradiated part irradiated with the laser beam 4 is preferably 5 to 50, 000, OOOW / cm 2 .
- the average power density does not reach 5 WZcm 2 , it is not preferable because sufficient fluctuation 10 cannot be given to the floating bubbles 3 and there is a possibility that bubbles cannot be broken.
- the laser beam 4 is excessively absorbed in the molten glass 2 and volatilization from the molten glass 2 is induced, which is not preferable because it causes a glass composition unevenness.
- the irradiation area S4 of the floating bubble 3 of the laser beam 4 is smaller than the projected cross-sectional area S3 of the floating bubble 3, ie, the projected area. If the irradiation area S4 of the laser beam 4 is larger than the projected cross section S3 of the floating bubble 3, it is difficult to induce local fluctuations on the bubble wall surface, and there is a possibility that bubbles cannot be broken.
- the diameter D3 of the floating bubble 3 is preferably 50 mm or less. Since the floating foam 3 having a diameter D3 exceeding 50 mm breaks with the foam itself without using the foam removal method of the present invention, it is efficient to use it for the floating foam 3 having a diameter D3 of 50 mm or less.
- the form of oscillation of the laser beam 4 is not particularly limited! Continuous oscillation light (CW light) or pulsed oscillation light, modulated light of continuous oscillation light (modulate continuous oscillation light with ONZOFF and change intensity periodically However, it is preferable to irradiate a laser beam of 0.1 Hz or higher for 0.05 seconds or longer. More preferably, irradiation is performed for 0.2 seconds or longer. In particular, a CO laser with the wavelength of 10.6 m being the most common is preferred in this wavelength region.
- the laser beam 4 When the laser beam 4 is irradiated, the laser beam 4 is almost absorbed by the floating bubble 3, and the temperature of a part of the floating bubble 3 irradiated with the laser beam 4 can be locally increased.
- the floating bubble 3 is broken even if the irradiation area S4 of the laser beam 4 is larger than the projected sectional area S3 of the floating bubble 3. Can be foamed.
- the pulse width is preferably 600 msec or less.
- the pulse width is more preferably 200 msec or less.
- bubbles can be broken preferably by scanning the laser beam 4 relative to the floating bubbles 3 on the surface of the molten glass 2 at a speed of 20 OmmZ seconds or less.
- the laser beam 4 of at least 0.1 Hz or more is irradiated for 0.05 seconds or more, the floating bubble 3 breaks. Therefore, when the laser beam 4 is pulse oscillation light, the laser beam 4 of 0.1 Hz or more is 0. 05 seconds or more It is preferable to use a pulse frequency and a scanning speed at which the floating bubble 3 is irradiated.
- the irradiation area S4 of the laser beam 4 is the projected cross-sectional area of the floating bubble 3 Even if it is larger than S3, the floating bubble 3 can be broken.
- the bubble removal method of the present invention can continuously remove the floating bubbles 3 on the surface of the molten glass 2 in a line in which the molten glass 2 is continuously supplied to produce the glass.
- defoaming means such as adding a clarifying agent, spraying a defoaming agent to the foam layer, using a bubbler in the dissolution tank 1, depressurizing the clarifying tank, and using a stirrer at the outlet of the clarifying tank. V, more effective.
- the foam removing method of the present invention is preferably used in the dissolution tank 1 under reduced pressure conditions.
- FIG. 4 is a schematic explanatory diagram of the bubble removing device according to the present invention.
- the bubble removing apparatus of the present invention has a mechanism 13 for irradiating at least one laser beam 4 to the floating bubbles 3 on the surface of the molten glass 2 and relative to the floating bubbles 3 of the molten glass 2.
- Laser beam 4 And a mechanism 12 for scanning.
- the foam removing device of the present invention is used in a place where bubbles in the molten glass 2 are raised and gathered on the surface, such as an outlet of a clarification tank and a forming step, for example, an entrance of a glass plate forming bath in the float process.
- the molten glass 2 flows in a narrow width by directing force downstream, such as the upper end portion of the downcomer of vacuum degassing. It should be noted that where the molten glass 2 flows wide downstream, it is preferable to attach a guide to the surface layer portion of the molten glass 2 to collect the floating bubbles 3 and to provide a plurality of laser beams 4.
- a sensor 14 capable of automatically detecting floating bubbles 3 of molten glass 2 is used in combination.
- An apparatus configuration, and an apparatus configuration in which the laser beam 4 is scanned in the width direction with respect to the width in which the molten glass 2 flows downstream are preferable.
- the glass raw material is melted, the molten glass is passed through a melting tank under reduced pressure (210 mmHg (128 kPa)), then the molten glass is supplied to the glass plate forming process, and a glass substrate (trade name AN100, manufactured by Asahi Glass Co., Ltd.)
- a glass substrate trade name AN100, manufactured by Asahi Glass Co., Ltd.
- the wavelength was 10.6 m).
- bubbles were detected by a camera attached to the outside of the internal observation window through an internal observation window (not shown) attached to the dissolution tank.
- a laser beam was applied to the floating bubbles on the surface of the molten glass so that the irradiated portion had a circular cross section.
- the conditions at that time are shown below and in Table 1.
- the irradiation angle A of the laser beam to the surface of the molten glass was 70 °.
- Projection cross section of floating foam S3 (mm 2 )
- Irradiation area for floating bubbles S4 (mm 2 )
- Average power density of laser beam Q (W / cm 2 )
- Example 12 As a result of the test, bubbles were emitted in 0.12 seconds in Example 12 after the laser beam irradiation, 0.1 seconds in Example 3, 0.13 seconds in Example 4, and 0.12 seconds in Example 5-6. Can be removed.
- Example 7 12 seconds after irradiation with the laser beam, the floating bubbles were broken, and those that were reduced to 0.4 mm but did not break remained.
- Comparative Example 1 was a conventional dissolution process, and the floating bubbles remained without breaking.
- this example is in a melting tank under reduced pressure (210 mmHg), the same effect can be obtained by irradiating the bubble on the surface of the molten glass in the melting tank at normal pressure with a laser beam. can get.
- the method of the present invention can be widely applied to glass plates in which defects due to bubbles in the glass are problematic.
- it is suitable for glass substrates for flat panel displays such as liquid crystal displays, plasma displays, organic EL displays, and field emission displays.
- the method of the present invention can be used in the steps of a glass production method such as a float method, a fusion method or a downdraw method. It should be noted that the entire contents of the specification, claims, drawings and abstract of the Japanese Patent Application No. 2006-132406 filed on May 11, 2006 are cited herein, and the specification of the present invention is disclosed. As it is incorporated.
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- Engineering & Computer Science (AREA)
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- Organic Chemistry (AREA)
- Laser Beam Processing (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2007800166804A CN101437764B (zh) | 2006-05-11 | 2007-03-14 | 熔融玻璃的除泡方法及除泡装置、以及玻璃的制造方法 |
JP2008515450A JP5115475B2 (ja) | 2006-05-11 | 2007-03-14 | 溶融ガラスの泡除去方法およびガラスの製造方法 |
US12/265,841 US8109118B2 (en) | 2006-05-11 | 2008-11-06 | Method for removing bubbles from molten glass and process for producing glass |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006132406 | 2006-05-11 | ||
JP2006-132406 | 2006-05-11 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/265,841 Continuation US8109118B2 (en) | 2006-05-11 | 2008-11-06 | Method for removing bubbles from molten glass and process for producing glass |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007132590A1 true WO2007132590A1 (ja) | 2007-11-22 |
Family
ID=38693692
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/055144 WO2007132590A1 (ja) | 2006-05-11 | 2007-03-14 | 溶融ガラスの泡除去方法および除去装置、並びにガラスの製造方法 |
Country Status (6)
Country | Link |
---|---|
US (1) | US8109118B2 (ja) |
JP (1) | JP5115475B2 (ja) |
KR (1) | KR101042871B1 (ja) |
CN (1) | CN101437764B (ja) |
TW (1) | TW200806595A (ja) |
WO (1) | WO2007132590A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008044808A (ja) * | 2006-08-14 | 2008-02-28 | Asahi Glass Co Ltd | 溶融ガラスの泡消去方法、泡消去装置およびガラス製造方法 |
JP2008255426A (ja) * | 2007-04-05 | 2008-10-23 | Nippon Steel Corp | 溶融スラグのフォーミング鎮静方法 |
JP2015536895A (ja) * | 2012-11-06 | 2015-12-24 | コーニング インコーポレイテッド | 基板の厚さ制御 |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1870388B1 (en) * | 2005-04-15 | 2010-09-08 | Asahi Glass Company Ltd. | Method for reducing diameter of bubble existing inside of glass plate |
US9725349B2 (en) | 2012-11-28 | 2017-08-08 | Corning Incorporated | Glass manufacturing apparatus and methods |
US9290403B2 (en) | 2013-02-25 | 2016-03-22 | Corning Incorporated | Repositionable heater assemblies for glass production lines and methods of managing temperature of glass in production lines |
KR102188032B1 (ko) | 2014-02-14 | 2020-12-08 | 삼성디스플레이 주식회사 | 유기 발광 표시 장치의 제조방법 |
CN106746601B (zh) | 2016-12-30 | 2019-06-04 | 东旭集团有限公司 | 用于制备玻璃的组合物、玻璃制品及用途 |
CN109489768B (zh) * | 2018-11-28 | 2020-07-10 | 乔治洛德方法研究和开发液化空气有限公司 | 监控玻璃熔体表面上泡界线位置的系统和方法及玻璃窑炉 |
CN110491993B (zh) * | 2019-07-24 | 2022-06-10 | 武汉华星光电半导体显示技术有限公司 | 一种pi基板的制备方法及其显示装置 |
CN112083520B (zh) | 2020-09-26 | 2021-08-10 | 南通惟怡新材料科技有限公司 | 量子点透镜、背光模组、显示装置及量子点透镜制作方法 |
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JPS6031306U (ja) * | 1983-08-08 | 1985-03-02 | 株式会社 西原環境衛生研究所 | 消泡装置 |
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JPS63252509A (ja) * | 1987-04-08 | 1988-10-19 | Mitsubishi Heavy Ind Ltd | 光ビ−ムを応用した消泡装置 |
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US3415636A (en) * | 1964-09-28 | 1968-12-10 | American Optical Corp | Method for treating molten glass with a laser beam |
US3612702A (en) * | 1969-09-09 | 1971-10-12 | Iris Corp | Web defect determination by laser beam irradiation and reflected light examination |
CA1174285A (en) * | 1980-04-28 | 1984-09-11 | Michelangelo Delfino | Laser induced flow of integrated circuit structure materials |
JPS6031306A (ja) | 1983-08-01 | 1985-02-18 | Sony Corp | バンドパスフイルタ |
US6685868B2 (en) * | 1995-10-30 | 2004-02-03 | Darryl Costin | Laser method of scribing graphics |
JP2004091307A (ja) | 2002-07-10 | 2004-03-25 | Nippon Electric Glass Co Ltd | ガラス製造方法 |
US6795484B1 (en) * | 2003-05-19 | 2004-09-21 | Johns Manville International, Inc. | Method and system for reducing a foam in a glass melting furnace |
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2007
- 2007-03-14 CN CN2007800166804A patent/CN101437764B/zh not_active Expired - Fee Related
- 2007-03-14 KR KR1020087018900A patent/KR101042871B1/ko active IP Right Grant
- 2007-03-14 WO PCT/JP2007/055144 patent/WO2007132590A1/ja active Application Filing
- 2007-03-14 JP JP2008515450A patent/JP5115475B2/ja not_active Expired - Fee Related
- 2007-05-07 TW TW096116170A patent/TW200806595A/zh not_active IP Right Cessation
-
2008
- 2008-11-06 US US12/265,841 patent/US8109118B2/en not_active Expired - Fee Related
Patent Citations (6)
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JPS6031306U (ja) * | 1983-08-08 | 1985-03-02 | 株式会社 西原環境衛生研究所 | 消泡装置 |
JPS63104620A (ja) * | 1986-10-20 | 1988-05-10 | Mitsubishi Heavy Ind Ltd | 消泡方法 |
JPS63252509A (ja) * | 1987-04-08 | 1988-10-19 | Mitsubishi Heavy Ind Ltd | 光ビ−ムを応用した消泡装置 |
JPH11349335A (ja) * | 1998-06-03 | 1999-12-21 | Asahi Glass Co Ltd | ガラス製造方法 |
JP2002523205A (ja) * | 1998-08-21 | 2002-07-30 | ザ・ビクトリア・ユニバーシテイ・オブ・マンチエスター | 泡沫制御 |
JP2004284949A (ja) * | 2004-05-12 | 2004-10-14 | Asahi Glass Co Ltd | 無アルカリガラスの清澄方法 |
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JP2008044808A (ja) * | 2006-08-14 | 2008-02-28 | Asahi Glass Co Ltd | 溶融ガラスの泡消去方法、泡消去装置およびガラス製造方法 |
JP2008255426A (ja) * | 2007-04-05 | 2008-10-23 | Nippon Steel Corp | 溶融スラグのフォーミング鎮静方法 |
JP2015536895A (ja) * | 2012-11-06 | 2015-12-24 | コーニング インコーポレイテッド | 基板の厚さ制御 |
Also Published As
Publication number | Publication date |
---|---|
CN101437764B (zh) | 2012-03-21 |
JP5115475B2 (ja) | 2013-01-09 |
KR101042871B1 (ko) | 2011-06-20 |
TWI359797B (ja) | 2012-03-11 |
CN101437764A (zh) | 2009-05-20 |
KR20080098016A (ko) | 2008-11-06 |
US20090113938A1 (en) | 2009-05-07 |
TW200806595A (en) | 2008-02-01 |
US8109118B2 (en) | 2012-02-07 |
JPWO2007132590A1 (ja) | 2009-09-24 |
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