WO2005023720A1 - Procede de controle du formage de verre plat - Google Patents
Procede de controle du formage de verre plat Download PDFInfo
- Publication number
- WO2005023720A1 WO2005023720A1 PCT/FR2004/050412 FR2004050412W WO2005023720A1 WO 2005023720 A1 WO2005023720 A1 WO 2005023720A1 FR 2004050412 W FR2004050412 W FR 2004050412W WO 2005023720 A1 WO2005023720 A1 WO 2005023720A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- laser diode
- glass
- tank
- forming
- concentration
- Prior art date
Links
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
-
- 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
-
- 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
- C03B18/04—Changing or regulating the dimensions of the molten glass ribbon
- C03B18/10—Changing or regulating the dimensions of the molten glass ribbon using electric means
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
Definitions
- the present invention relates to a method for controlling the forming of flat glass by flowing molten glass over a sheet of liquid tin.
- the float flat glass forming process consists in bringing hot glass coming out of a melting furnace onto a sheet of liquid tin maintained in a tank.
- the tank consists of a metal box whose walls are lined with a refractory material.
- the glass spreads over the denser tin up to a thickness of approximately 6 mm conditioned by the combined effect of the forces of gravity, surface tension and traction. This latter force is exerted by the support rollers of the frozen glass ribbon in the annealing drying rack located downstream of the tin tank.
- the forming of flat glass is carried out under an atmosphere comprising nitrogen and hydrogen (3 to 10% by volume of the atmosphere) in order to limit the oxidation of tin under the effect of low inflows of air, degassing of the glass and residual species in the nitrogen and the hydrogen introduced, such as water.
- This atmosphere is maintained at slightly positive pressure and is continuously renewed in order to avoid the accumulation of impurities which can cause defects on the glass.
- the presence of water and oxygen contaminates the tin and causes an emission of stannous oxide (SnO) in the atmosphere.
- This stannous oxide can condense on the refractory walls in the downstream part of the tank and, by chemical reduction, fall into metallic drops on the glass ribbon.
- the increase in the dissolved oxygen content in the tin bath results in the absorption of increasing amounts of stannous oxide on the underside of the glass ribbon. If these quantities are too large, this stannous oxide can be transformed into stannic oxide during the subsequent heat treatments of the glass ribbon and form a bluish veil on the glass.
- the solubility of oxygen being strongly correlated with the temperature (from 630 to 5 ppm when the tin goes from 1000 to 600 ° C), and the scrolling of the glass leading to the rapid circulation of the tin from the upstream area hot (1000 ° C) in the cold downstream area of the tank (600 ° C), the oxygen dissolved in the hot area can precipitate stannic oxide in the cold part of the tank and generate a progressive fouling of the tin bath.
- the aim of the present invention is to propose a method for controlling the forming of flat glass by measuring the water content which does not present the above problems.
- the invention relates to a process for controlling the forming of flat glass by flowing molten glass over a sheet of liquid tin, in which the concentration of the glass is measured using at least one laser diode. H 2 0 above the surface of the glass being formed.
- laser diode is understood to mean a measurement system consisting of: - a laser beam emitter preferably having a variable wavelength in a wavelength range ⁇ d which includes l '' at least one of the characteristic lengths absorbed by the species whose presence is to be detected, - a detector of this beam after it has passed through the medium to be analyzed - means of comparison, for example of the amplitude of the laser beam received (beam intensity) and the amplitude of the laser beam emitted over the entire wavelength range considered.
- at least one laser diode of the process implemented also measures the temperature.
- the laser diode can be placed at a distance from the surface of the glass being formed of between 2 and 50 cm, preferably between 5 and 20 cm.
- Several diodes laser can be placed at different points along the length of the tank.
- at least one laser diode measuring the H 2 0 concentration is placed at at least one of the following locations: - in the hot zone and upstream of the tank, because the solubility of oxygen in the tin is there important, - in the cold and downstream area of the tank, because the air inlets are often greater there because of the exit of the glass ribbon. It is also preferable to place at least one laser diode measuring the temperature in the hot zone and upstream of the tank.
- the laser diodes are positioned so that their laser beam is transverse to the movement of the glass during forming.
- the laser beam enters the oven through sight windows drilled in the wall of the metal box at a height such that the laser beam passes a short distance above the surface of the glass being formed.
- the laser transmitter and receiver can be positioned behind each of these sight windows.
- the transmitter and the receiver can be placed behind the same viewing window; a mirror is placed behind the second viewing window so as to reflect the laser beam emitted by the transmitter to the receiver.
- a gas such as nitrogen, can be used to clean the surface of the viewing windows of the transmitter and receiver and possibly the mirror in order to avoid the deposition of dust to prevent overheating of the transmitter. and the receiver.
- the laser diode has the advantage of carrying out an average measurement along the optical path, therefore over the entire width of the cell, of the desired information. It allows measurement a few centimeters above the surface of the glass being formed without penetration of elements into the tank, which avoids high maintenance of the sensors in contact with the atmosphere of the tank and limited access or difficult to collectors. In addition, the laser diode does not generate changes in heat transfer to the load, unlike the case of a probe which is placed a few cm above the load. Thanks to the invention, it is possible to adjust the heating profile of the forming tank and the distribution of nitrogen and hydrogen flows introduced into the tank as a function of the H 2 0 concentration and temperature values measured by the laser diode.
- the evolution of the rate of defects generated by the tin and the operating conditions of the line are parameters which can also be taken into account in addition to the H 2 0 concentration and temperature to adjust the heating profile and the distribution of nitrogen and hydrogen flows. Thanks to the invention, it is also possible to program maintenance and or cleaning operations for the tin bath as a function of the H 2 0 concentration values measured by the laser diode.
- the operating conditions of the line can also be taken into account to carry out this programming.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Optics & Photonics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Glass Compositions (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04816097A EP1675805A1 (fr) | 2003-09-09 | 2004-09-03 | Procede de controle du formage de verre plat |
JP2006525867A JP2007505027A (ja) | 2003-09-09 | 2004-09-03 | 板ガラスの成形を制御するための方法 |
US10/570,451 US20070062218A1 (en) | 2003-09-09 | 2004-09-03 | Method for controlling the forming of flat glass |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0350513 | 2003-09-09 | ||
FR0350513A FR2859469B1 (fr) | 2003-09-09 | 2003-09-09 | Procede de controle du formage de verre plat |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005023720A1 true WO2005023720A1 (fr) | 2005-03-17 |
Family
ID=34178994
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2004/050412 WO2005023720A1 (fr) | 2003-09-09 | 2004-09-03 | Procede de controle du formage de verre plat |
Country Status (7)
Country | Link |
---|---|
US (1) | US20070062218A1 (fr) |
EP (1) | EP1675805A1 (fr) |
JP (1) | JP2007505027A (fr) |
KR (1) | KR20060117307A (fr) |
CN (1) | CN1849268A (fr) |
FR (1) | FR2859469B1 (fr) |
WO (1) | WO2005023720A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007017616A2 (fr) * | 2005-08-11 | 2007-02-15 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Procede de controle par spectroscopie d'absorption au cours du formage de verre plat et dispositif de controle |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20220169549A1 (en) * | 2019-03-20 | 2022-06-02 | Air Products And Chemicals, Inc. | Method for tin bath monitoring and control |
CN111574053B (zh) * | 2020-05-25 | 2022-09-06 | 福州新福兴玻璃科技有限公司 | 一种无硫无碳着色玻璃的制备方法 |
WO2024076400A1 (fr) * | 2022-10-04 | 2024-04-11 | Air Products And Chemicals, Inc. | Procédé et système de commande d'une atmosphère de bain d'étain pour la réduction de défauts de surface |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001033200A1 (fr) * | 1999-11-04 | 2001-05-10 | L'air Liquide, Societe Anonyme À Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude | Procede permettant de surveiller de maniere continue des especes chimiques et une temperature dans des gaz de processus chauds |
WO2003046497A1 (fr) * | 2001-11-30 | 2003-06-05 | L'air Liquide, Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Gorges Claude | Methode de conduite et de controle de procedes de traitement thermique de produits dans des fours continus |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3337322A (en) * | 1962-10-17 | 1967-08-22 | Pilkington Brothers Ltd | Method of manufacture of flat glass with reducing atmosphere |
FR2782326B1 (fr) * | 1998-08-13 | 2000-09-15 | Air Liquide | Procede de galvanisation d'une bande metallique |
US20020031737A1 (en) * | 2000-03-10 | 2002-03-14 | American Air Liquide, Inc. | Method for continuously monitoring chemical species and temperature in hot process gases |
US20030132389A1 (en) * | 2002-01-17 | 2003-07-17 | Von Drasek William A. | Method for monitoring and controlling the high temperature reducing combustion atmosphere |
US6943886B2 (en) * | 2002-02-11 | 2005-09-13 | Air Liquide America, L.P. | Method for enhanced gas monitoring in high particle density flow streams |
-
2003
- 2003-09-09 FR FR0350513A patent/FR2859469B1/fr not_active Expired - Fee Related
-
2004
- 2004-09-03 US US10/570,451 patent/US20070062218A1/en not_active Abandoned
- 2004-09-03 EP EP04816097A patent/EP1675805A1/fr not_active Withdrawn
- 2004-09-03 CN CNA2004800259699A patent/CN1849268A/zh active Pending
- 2004-09-03 WO PCT/FR2004/050412 patent/WO2005023720A1/fr active Application Filing
- 2004-09-03 JP JP2006525867A patent/JP2007505027A/ja not_active Withdrawn
- 2004-09-03 KR KR1020067004817A patent/KR20060117307A/ko not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001033200A1 (fr) * | 1999-11-04 | 2001-05-10 | L'air Liquide, Societe Anonyme À Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude | Procede permettant de surveiller de maniere continue des especes chimiques et une temperature dans des gaz de processus chauds |
WO2003046497A1 (fr) * | 2001-11-30 | 2003-06-05 | L'air Liquide, Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Gorges Claude | Methode de conduite et de controle de procedes de traitement thermique de produits dans des fours continus |
Non-Patent Citations (3)
Title |
---|
C.A. FALLERONI, C.K. EDGE: "Float Glass Technology: The Bath Atmosphere System", PPG TECHNOL. J., vol. 2, no. 1, 1996, pages 61 - 70, XP002274905 * |
DRASEK VON W ET AL: "MULTI-FUNCTIONAL INDUSTRIAL COMBUSTION PROCESS MONITORING WITH TUNABLE DIODE LASERS", PROCEEDINGS OF THE SPIE, SPIE, BELLINGHAM, VA, US, vol. 4201, 6 November 2000 (2000-11-06), pages 133 - 141, XP001148177, ISSN: 0277-786X * |
R.C. SZE, C.A. SMITH: "High-temperature absorption studies of the Schumann-Runge band of oxygen at ArF laser wavelengths", J. OPT. SOC. AM. B, vol. 17, no. 3, 2000, pages 462 - 475, XP002274904 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007017616A2 (fr) * | 2005-08-11 | 2007-02-15 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Procede de controle par spectroscopie d'absorption au cours du formage de verre plat et dispositif de controle |
FR2889697A1 (fr) * | 2005-08-11 | 2007-02-16 | Air Liquide | Procede de controle par spectroscopie au cours du formage de verre plat |
WO2007017616A3 (fr) * | 2005-08-11 | 2007-03-29 | Air Liquide | Procede de controle par spectroscopie d'absorption au cours du formage de verre plat et dispositif de controle |
US8220291B2 (en) | 2005-08-11 | 2012-07-17 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Method for monitoring by absorption spectroscopy during the forming of flat glass and monitoring device |
Also Published As
Publication number | Publication date |
---|---|
EP1675805A1 (fr) | 2006-07-05 |
CN1849268A (zh) | 2006-10-18 |
FR2859469A1 (fr) | 2005-03-11 |
FR2859469B1 (fr) | 2006-01-06 |
KR20060117307A (ko) | 2006-11-16 |
US20070062218A1 (en) | 2007-03-22 |
JP2007505027A (ja) | 2007-03-08 |
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