CN102112404A - Apparatus and process for producing float glass - Google Patents
Apparatus and process for producing float glass Download PDFInfo
- Publication number
- CN102112404A CN102112404A CN2009801298477A CN200980129847A CN102112404A CN 102112404 A CN102112404 A CN 102112404A CN 2009801298477 A CN2009801298477 A CN 2009801298477A CN 200980129847 A CN200980129847 A CN 200980129847A CN 102112404 A CN102112404 A CN 102112404A
- Authority
- CN
- China
- Prior art keywords
- atmosphere
- glass
- float bath
- front lintel
- float
- 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.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B18/00—Shaping glass in contact with the surface of a liquid
- C03B18/02—Forming sheets
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B18/00—Shaping glass in contact with the surface of a liquid
- C03B18/02—Forming sheets
- C03B18/16—Construction of the float tank; Use of material for the float tank; Coating or protection of the tank wall
-
- 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
Abstract
An apparatus and process for float glass production are provided which enable a high-quality glass to be obtained. In the apparatus (1) for float glass production, the front lintel gap (24) which is the gap between the surface of a molten glass (4) and a front lintel (12) separating a spout (7) from a float bath (3) is 10-40 mm when the apparatus is in the steady state. The atmosphere in the float bath (3) has a tin vapor concentration of 3-10 mg/m3 and a hydrogen concentration of 4-10 vol.%. The rate of nitrogen supply to the atmosphere in the float bath (3) is 5-20 Nm3/hr per m3 of the atmosphere in the float bath (3). The atmosphere in the spout (7) has a tin vapor concentration of 0.3-1 mg/m3 and a hydrogen concentration of 0-0.4 vol.%. The rate of nitrogen supply to the atmosphere in the spout (7) is 20-1,000 Nm3/hr, excluding 20 Nm3/hr, per m3 of the atmosphere in the spout (7).
Description
Technical field
The present invention relates to a kind of manufacturing installation and manufacture method of float glass.
Background technology
The manufacturing of float glass is to supply with melten glass constantly on the surface of the molten tin that is full of float bath (float bath), and with a plurality of heater heats melten glass and make melten glass the direction to defined flows along the surface of molten metal, be configured as target width/thickness band plate-like glass ribbon and obtain sheet glass.Therefore when utilizing float forming, productivity is higher, and Flatness is good, is widely used in panel for construction glass for example or panel substrate with in the manufacturing of glass etc., and is used to improve the scheme (for example, with reference to patent documentation 1) of quality in research always.
The manufacture method of patent documentation 1 disclosed float glass is blown into nitrogen to the space (baffle space) that 2 baffle plates and the melten glass of the flow of regulating the melten glass of supplying with from melting furnace forms, and the interval of pressure ratio from the baffle plate to the float bath that keeps this baffle space is the pressure height of chute.Utilize this pressure difference, can prevent that the tin steam that flows into chute from float bath from flowing into baffle space, and prevent the cassiterite (SnO that tin steam and oxygen reaction generate
2) crystallization is attached on the baffle plate as movable part.In addition, the cassiterite crystallization becomes the defective of glass when dropping onto melten glass.
Patent documentation
Patent documentation 1: Japanese kokai publication hei 7-109130 communique
Summary of the invention
In recent years, be accompanied by the maximization of indicating meter, require the further raising/stabilization of display quality, and the glass substrate of its use requires further to suppress the raising of qualities such as defective.Therefore, as indicating meter glass, require further to suppress the cassiterite crystallization.
Float bath and chute by antetheca, be that front lintel (front lintel) separates, melten glass is when the influx change of float bath is bigger when producing beginning etc., in order to make melten glass not contact front lintel, be provided with the interval between front lintel and the melten glass to such an extent that compare broad.In addition, the chute atmosphere temperature is lower than float bath atmosphere temperature, and float bath atmosphere more easily flows into chute.When the contained tin steam flow of float bath atmosphere is gone into chute and the micro amount of oxygen reaction that flows into from the gap of the works such as refractory brick that constitute chute, generate the cassiterite crystallization.
In addition, when the contained hydrogen stream of float bath atmosphere was gone into chute, the surface of melten glass was reduced.Thus, can cause for example taking place easily the PDP substrate uses the quality of glass to reduce with the xanthochromia panel substrate such as (electrode generate the yellow colour developing that the silver in the operation is starched the glass after burning till) of glass.
The present invention foundes in view of above-mentioned problem, and purpose is to provide a kind of manufacturing installation and manufacture method that can access the float glass of high-quality glass.
The manufacture method of the manufacturing installation of float glass that above-mentioned purpose can be by following (1) of the present invention and the float glass of following (2) reaches.
(1) a kind of manufacturing installation of float glass makes the melten glass that supplies to float bath via chute from melting furnace along the surface flow of the molten tin that is full of this float bath and be configured as the glass ribbon of band plate-like, it is characterized in that,
Under steady state, front lintel and the front lintel gap between the molten glass surface that described chute and described float bath are separated are 10mm～40mm,
Tin vapor concentration in the described float bath atmosphere is 3～10mg/m
3, hydrogen concentration is 4～10 volume %, the feed rate of the nitrogen in the described float bath atmosphere is at every 1m
3Be 5～20Nm in the described float bath atmosphere
3/ hour,
Tin vapor concentration in the described chute atmosphere is 0.3～1mg/m
3, hydrogen concentration is 0～0.4 volume %, the feed rate of the nitrogen in the described chute atmosphere is at every 1m
3Be greater than 20Nm in the described chute atmosphere
3/ hour and be no more than 1000Nm
3/ hour.
(2) a kind of manufacture method of float glass makes the melten glass that supplies to float bath via chute from melting furnace along the surface flow of the molten tin that is full of this float bath and be configured as the glass ribbon of band plate-like, it is characterized in that,
During starting, front lintel that described chute and described float bath are separated and the front lintel gap between the molten glass surface be for greater than 40mm and be no more than 100mm,
Under steady state, described front lintel gap is 10mm～40mm,
Under steady state, the tin vapor concentration in the described float bath atmosphere is 3～10mg/m
3, hydrogen concentration is 4～10 volume %, the feed rate of the nitrogen in the described float bath atmosphere is at every 1m
3Be 5～20Nm in the described float bath atmosphere
3/ hour, and the tin vapor concentration in the described chute atmosphere is 0.3～1mg/m
3, hydrogen concentration is 0～0.4 volume %, the nitrogen feed rate in the described chute atmosphere is at every 1m
3Be greater than 20Nm in the described chute atmosphere
3/ hour and be no more than 1000Nm
3/ hour.
The invention effect
According to the present invention, suitably keep float bath atmosphere and chute atmosphere tin vapor concentration, hydrogen concentration separately, suppress to generate the cassiterite crystallization in the chute, suppress melten glass simultaneously and be reduced.Thus, can obtain high-quality glass.
Description of drawings
Fig. 1 is the sectional view of an embodiment of the manufacturing installation of expression float glass of the present invention.
Fig. 2 is the major portion stereographic map of manufacturing installation of the float glass of Fig. 1.
Nomenclature
The manufacturing installation of 1 float glass
3 float baths
4 melten glass
5 molten tin
6 baffle plates (ト ウ イ Le)
7 chutes
12 front lintels
21 front lintel main bodys
22 front lintel gap adjustment plates
24 front lintel gaps
Embodiment
Below, with reference to accompanying drawing, explain an embodiment of the manufacture method of sheet glass of the present invention.
Fig. 1 is the sectional view of an embodiment of the manufacturing installation of expression float glass of the present invention, and Fig. 2 is the major portion stereographic map of manufacturing installation of the float glass of Fig. 1.
As shown in Figure 1, the manufacturing installation 1 of the float glass of present embodiment flows through never illustrated melting furnace to supply on the lip (lip) 2 melten glass 4 in the float bath 3 along the surface flow of the molten tin 5 that is full of float bath 3, is configured as the glass ribbon of band plate-like.Take out glass ribbon from the outlet of float bath 3, afterwards, in not shown annealing furnace (leer), slowly cool off, cut into the size of regulation after the cleaning.
Controlling flow is set between melting furnace and float bath 3 crosses the baffle plate 6 of the flow of the melten glass 4 on the lip 2.Via the melten glass 4 of baffle plate 6 dominant discharge at the antetheca of float bath 3, be that tight the place ahead of front lintel 12 supplies to the float bath 3 from the front end of lip 2.
In float bath 3, in order to prevent the rotten of on the surface of molten tin 5 mobile melten glass 4, supplying with rare gas elementes such as nitrogen is the gas of main component, suppresses extraneous gas (oxygen) and flows in the float bath 3.Comprise in this gas and be used to prevent the vapor-phase oxidation of molten tin 5 and generate the hydrogen that the cassiterite crystalline has reductibility.In addition, the feed rate of the nitrogen in the atmosphere of float bath 3 is at every 1m
35～20Nm in the atmosphere of float bath 3
3/ hour.The not shown pipeline that supplies to the top board structure 11 of above-mentioned gas by being arranged on float bath 3 in the float bath 3 is discharged to the outside.At this moment, the steam of molten tin 5 also is discharged from together.In the present embodiment, by supply with above-mentioned gas in float bath 3, the atmosphere in the float bath 3 remains on tin vapor concentration 3～10mg/m
3, hydrogen concentration 4～10 volume %.
Separate with chute 7 between baffle plate 6 and the front lintel 12.
And then with reference to Fig. 2, the front lintel 12 that separates float bath 3 and chute 7 has front lintel main body 21 that is fixed in top board structure 11 and the front lintel gap adjustment plate 22 that is installed on front lintel main body 21.Front lintel gap adjustment plate 22 is supported on the guide 23 that is arranged at front lintel main body 21, can lifting with near or leave mobile melten glass 4 on the surface of the molten tin 5 of float bath 3.In addition, among Fig. 2, the fire resisting construction thing for dividing front lintel 12 chute 7 in addition omits diagram.
The manufacturing installation 1 of the float glass of present embodiment when producing beginning etc. during starting, above ± 5% o'clock, the lower edge of front lintel gap adjustment plate 22 and the front lintel gap 24 between the melten glass 4 were set at greater than 40mm and are no more than 100mm melten glass 4 to the rate of change of the influx of float bath 3 (ton/hour).Thus, even the influx change also can be avoided contacting of melten glass 4 and front lintel gap adjustment plate 22, can make melten glass 4 successfully flow into float bath 3.The rate of change can be held according to the amount of pulling out (ton/hour) of the glass ribbon of pulling out from float bath 3.
And, under steady state, be melten glass 4 when the rate of change of the influx of float bath 3 (ton/hour) is in ± 5%, front lintel gap adjustment plate 22 descends, and the lower edge of front lintel gap adjustment plate 22 and the front lintel gap 24 between the melten glass 4 narrow down.Thus, can suppress the atmosphere of float bath 3 by these front lintel gap 24 inflow chutes 7.The front lintel gap 24 of this moment is preferably 10mm～40mm, more preferably 10mm～30mm.In addition, supplying with in chute 7 with rare gas elementes such as nitrogen is that the gas of main component flows in the chute 7 to suppress extraneous gas (oxygen).The feed rate of the nitrogen in the atmosphere of chute 7 is at every 1m
3Be greater than 20Nm in the atmosphere of chute 7
3/ hour and be no more than 1000Nm
3/ hour, be preferably 50～500Nm
3/ hour.Thus, the atmosphere in the chute 7 is remained on tin vapor concentration 0.3～1mg/m
3, hydrogen concentration 0～0.4 volume %.Remain on above-mentioned concentration by atmosphere, can suppress to generate the cassiterite crystallization in the chute 7, can suppress melten glass 4 simultaneously and be reduced chute 7.
Front lintel gap adjustment plate 22 considers from aspects such as resistivity against fire, thermotolerance, scale resistances, for example can be formed by brick, carbon, the carbon that is coated with SiC, especially preferably is coated with the carbon of the good SiC of scale resistance.
As described above, utilize the manufacturing installation 1 of the float glass of present embodiment, suitably keep float bath atmosphere and chute atmosphere tin vapor concentration, hydrogen concentration separately, suppress to generate the cassiterite crystallization in the chute 7, suppress melten glass 4 simultaneously and be reduced.Thus, can obtain high-quality glass.
In addition, the present invention is not limited to above-mentioned embodiment, the distortion that can suit, improvement etc.In addition,, material of each integrant in the above-mentioned embodiment, shape, size, numerical value, form, quantity, configuration position etc. can set arbitrarily as long as can finishing the present invention, and unqualified.
Embodiment
Below, in order to confirm effect of the present invention, use the manufacturing installation of Fig. 1, under steady state,, carry out the float forming of PDP substrate with glass according to the condition of table 1, the cassiterite crystalline of estimating the per unit area on the glass pane surface with naked eyes adheres to.In addition, during starting before entering steady state, the front lintel gap adjustment plate lifting that the carbon that is coated with SiC is made, the front lintel gap is set to 90mm, and the melten glass in the time of therefore can making starting successfully flows into float bath.
[table 1]
The sheet glass of embodiment is compared with the sheet glass of comparative example, and the cassiterite crystalline adheres to the defective that causes and is reduced to below 1/5.In addition, as shown in Table 1, because of the hydrogen concentration of chute reduces, so can obtain high quality glass that the PDP substrate is inhibited etc. with glass xanthochromic as panel substrate glass.In addition, can use the manufacturing installation of Fig. 1 to carry out the float forming of long glass, can stably obtain high-quality glass.
More than, understand the present invention in detail with reference to specific embodiment, but it will be apparent for a person skilled in the art that under the situation that does not break away from the spirit and scope of the present invention, can carry out various changes and modification.The application is based on the Japanese patent application 2008-193716 of application on July 28th, 2008, and its content is incorporated this specification sheets as a reference into.
Claims (5)
1. the manufacturing installation of a float glass makes the melten glass that supplies to float bath via chute from melting furnace along the surface flow of the molten tin that is full of this float bath and be configured as the glass ribbon of band plate-like, it is characterized in that,
Under steady state, front lintel and the front lintel gap between the molten glass surface that described chute and described float bath are separated are 10mm～40mm,
Tin vapor concentration in the described float bath atmosphere is 3～10mg/m
3, hydrogen concentration is 4～10 volume %, the nitrogen feed rate in the described float bath atmosphere is at every 1m
3Be 5～20Nm in the described float bath atmosphere
3/ hour,
Tin vapor concentration in the described chute atmosphere is 0.3～1mg/m
3, hydrogen concentration is 0～0.4 volume %, the nitrogen feed rate in the described chute atmosphere is at every 1m
3Be greater than 20Nm in the described chute atmosphere
3/ hour and be no more than 1000Nm
3/ hour.
2. the manufacturing installation of float glass as claimed in claim 1, it is characterized in that, described front lintel has the refractory materials system front lintel main body that the position is fixed and liftably is arranged on front lintel gap adjustment plate on this front lintel main body, when starting, described front lintel gap is greater than 40mm and is no more than 100mm.
3. the manufacturing installation of float glass as claimed in claim 2 is characterized in that, described front lintel gap adjustment plate is made by the carbon that is coated with SiC.
4. the manufacture method of a float glass makes the melten glass that supplies to float bath via chute from melting furnace along the surface flow of the molten tin that is full of this float bath and be configured as the glass ribbon of band plate-like, it is characterized in that,
During starting, front lintel that described chute and described float bath are separated and the front lintel gap between the molten glass surface be for greater than 40mm and be no more than 100mm,
Under steady state, described front lintel gap is 10mm～40mm,
Under steady state, the tin vapor concentration in the described float bath atmosphere is 3～10mg/m
3, hydrogen concentration is 4～10 volume %, the nitrogen feed rate in the described float bath atmosphere is at every 1m
3Be 5～20Nm in the described float bath atmosphere
3/ hour, and the tin vapor concentration in the described chute atmosphere is 0.3～1mg/m
3, hydrogen concentration is 0～0.4 volume %, the nitrogen feed rate in the described chute atmosphere is at every 1m
3Be greater than 20Nm in the described chute atmosphere
3/ hour and be no more than 1000Nm
3/ hour.
5. the manufacture method of float glass as claimed in claim 4 is characterized in that,
Described front lintel has the refractory materials system front lintel main body that the position is fixed,
On described front lintel main body, liftably be provided with front lintel gap adjustment plate,
By described front lintel gap is regulated in the lifting of described front lintel gap adjustment plate.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008193716 | 2008-07-28 | ||
| JP2008-193716 | 2008-07-28 | ||
| PCT/JP2009/062011 WO2010013575A1 (en) | 2008-07-28 | 2009-06-30 | Apparatus and process for producing float glass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102112404A true CN102112404A (en) | 2011-06-29 |
| CN102112404B CN102112404B (en) | 2013-08-21 |
Family
ID=41610275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009801298477A Active CN102112404B (en) | 2008-07-28 | 2009-06-30 | Apparatus and process for producing float glass |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP5459213B2 (en) |
| KR (1) | KR101529753B1 (en) |
| CN (1) | CN102112404B (en) |
| TW (1) | TWI386379B (en) |
| WO (1) | WO2010013575A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104176913A (en) * | 2014-08-12 | 2014-12-03 | 中国南玻集团股份有限公司 | Groove kiln for float glass and manufacturing device of float glass |
| CN104718166A (en) * | 2012-11-22 | 2015-06-17 | 旭硝子株式会社 | Molding device for float glass and method for manufacturing float glass |
| CN104995141A (en) * | 2013-02-18 | 2015-10-21 | 旭硝子株式会社 | Method for manufacturing glass plate and device for manufacturing glass plate |
| CN105358493A (en) * | 2013-09-13 | 2016-02-24 | 旭硝子株式会社 | Float glass production apparatus and float glass production method using same |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009000348B4 (en) * | 2008-08-28 | 2011-09-01 | Schott Ag | Process for the production of flat glass |
| JP6206179B2 (en) * | 2013-12-27 | 2017-10-04 | 日本電気硝子株式会社 | Molten glass supply apparatus and glass plate manufacturing apparatus |
| KR102639796B1 (en) * | 2019-05-27 | 2024-02-22 | 주식회사 엘지화학 | Apparatus for manufacturing glass plate |
| KR102639801B1 (en) * | 2019-05-27 | 2024-02-22 | 주식회사 엘지화학 | Apparatus for manufacturing glass plate |
| KR102639794B1 (en) * | 2019-05-27 | 2024-02-22 | 주식회사 엘지화학 | Apparatus for manufacturing glass plate |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3351451A (en) * | 1962-10-11 | 1967-11-07 | Pilkington Brothers Ltd | Apparatus for forming glass ribbon on molten metal with gas seal means |
| US3934994A (en) * | 1974-05-30 | 1976-01-27 | Ppg Industries, Inc. | Control of thermal convection in a float glass forming chamber |
| CN1446764A (en) * | 2002-03-06 | 2003-10-08 | 舱壁玻璃公司 | Appts. for conveying glass melt via overflow brick (outlet end) when producing float glass |
| JP2008143746A (en) * | 2006-12-11 | 2008-06-26 | Nippon Electric Glass Co Ltd | Method of manufacturing glass plate, apparatus therefor and glass substrate for flat panel display |
-
2009
- 2009-06-30 WO PCT/JP2009/062011 patent/WO2010013575A1/en active Application Filing
- 2009-06-30 CN CN2009801298477A patent/CN102112404B/en active Active
- 2009-06-30 KR KR1020117002241A patent/KR101529753B1/en active IP Right Grant
- 2009-06-30 JP JP2010522666A patent/JP5459213B2/en not_active Expired - Fee Related
- 2009-07-23 TW TW098124923A patent/TWI386379B/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3351451A (en) * | 1962-10-11 | 1967-11-07 | Pilkington Brothers Ltd | Apparatus for forming glass ribbon on molten metal with gas seal means |
| US3934994A (en) * | 1974-05-30 | 1976-01-27 | Ppg Industries, Inc. | Control of thermal convection in a float glass forming chamber |
| CN1446764A (en) * | 2002-03-06 | 2003-10-08 | 舱壁玻璃公司 | Appts. for conveying glass melt via overflow brick (outlet end) when producing float glass |
| JP2008143746A (en) * | 2006-12-11 | 2008-06-26 | Nippon Electric Glass Co Ltd | Method of manufacturing glass plate, apparatus therefor and glass substrate for flat panel display |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104718166A (en) * | 2012-11-22 | 2015-06-17 | 旭硝子株式会社 | Molding device for float glass and method for manufacturing float glass |
| CN104718166B (en) * | 2012-11-22 | 2017-07-14 | 旭硝子株式会社 | The building mortion of float glass and the manufacture method of float glass |
| CN104995141A (en) * | 2013-02-18 | 2015-10-21 | 旭硝子株式会社 | Method for manufacturing glass plate and device for manufacturing glass plate |
| CN105358493A (en) * | 2013-09-13 | 2016-02-24 | 旭硝子株式会社 | Float glass production apparatus and float glass production method using same |
| CN104176913A (en) * | 2014-08-12 | 2014-12-03 | 中国南玻集团股份有限公司 | Groove kiln for float glass and manufacturing device of float glass |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2010013575A1 (en) | 2012-01-12 |
| TW201004878A (en) | 2010-02-01 |
| TWI386379B (en) | 2013-02-21 |
| KR101529753B1 (en) | 2015-06-17 |
| JP5459213B2 (en) | 2014-04-02 |
| KR20110049785A (en) | 2011-05-12 |
| WO2010013575A1 (en) | 2010-02-04 |
| CN102112404B (en) | 2013-08-21 |
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Address after: Tokyo, Japan Patentee after: AGC Corporation Address before: Tokyo, Japan Patentee before: Asahi Glass Co., Ltd. |