WO2008029649A1 - Procédés de fabrication de verre - Google Patents

Procédés de fabrication de verre Download PDF

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Publication number
WO2008029649A1
WO2008029649A1 PCT/JP2007/066490 JP2007066490W WO2008029649A1 WO 2008029649 A1 WO2008029649 A1 WO 2008029649A1 JP 2007066490 W JP2007066490 W JP 2007066490W WO 2008029649 A1 WO2008029649 A1 WO 2008029649A1
Authority
WO
WIPO (PCT)
Prior art keywords
vacuum degassing
water vapor
glass
gas
vapor concentration
Prior art date
Application number
PCT/JP2007/066490
Other languages
English (en)
Japanese (ja)
Inventor
Hideki Kushitani
Toshiyasu Kawaguchi
Shingo Urata
Hajime Itoh
Kenta Saito
Original Assignee
Asahi Glass Company, Limited
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 Asahi Glass Company, Limited filed Critical Asahi Glass Company, Limited
Priority to JP2008533101A priority Critical patent/JP5434077B2/ja
Priority to KR1020097000999A priority patent/KR101419957B1/ko
Publication of WO2008029649A1 publication Critical patent/WO2008029649A1/fr

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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
    • C03B5/2252—Refining under reduced pressure, e.g. with vacuum refiners
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
    • C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
    • 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 glass manufacturing method including a step of degassing a vacuum, a method of adjusting a water vapor concentration in an upper space in a vacuum degassing vessel, and a vacuum degassing device.
  • molten glass is introduced into a reduced-pressure atmosphere, and bubbles in the molten glass flow that continuously flows under this reduced-pressure atmosphere are grown to increase the bubbles contained in the molten glass.
  • a vacuum degassing method in which a vacuum degassing method is performed, which is then removed from the vacuum atmosphere.
  • Patent Document 1 Patent Document 1
  • Reference 2 Patent Document 2
  • Patent Document 1 Japanese Patent Laid-Open No. 2000-128422
  • Patent Document 2 International Publication No. 02/098810 Pamphlet
  • An object of the present invention is to provide a glass manufacturing method for performing degassing under reduced pressure without causing bumping.
  • a method of adjusting the water vapor concentration of the atmospheric gas in the vacuum degassing tank that can be preferably applied for such vacuum degassing, and the vacuum degassing of the molten glass capable of such vacuum degassing. It is to provide a foam device.
  • the present inventor has studied in detail the phenomenon in which the bubble layer on the surface of the molten glass in the vacuum degassing tank is enlarged, that is, the vacuum degassing treatment conditions when a so-called bumping occurs to cause a defect. And when the water vapor
  • the present invention provides the following (1) to (8).
  • a glass production method comprising a step of depressurizing and defoaming molten glass by setting the water vapor concentration of the atmospheric gas in the vacuum degassing tank to 60 mol% or less.
  • a decompression housing to be sucked under reduced pressure a decompression deaeration tank provided in the decompression housing for decompressing defoaming of the molten glass, and provided in communication with the decompression defoaming tank, Molten glass having introduction means for introducing the molten glass into the vacuum degassing tank and lead-out means provided in communication with the vacuum degassing tank and for deriving the molten glass after vacuum degassing from the vacuum degassing tank
  • a degassing apparatus comprising: a water vapor concentration measuring means for measuring a water vapor concentration of the atmospheric gas in the vacuum degassing tank; and a low moisture gas for introducing a low moisture gas into an upper space inside the vacuum degassing tank.
  • Vacuum degassing apparatus for molten glass further comprising gas introduction means
  • a water vapor concentration control means that can control the water vapor concentration of the atmospheric gas to a desired value in the vacuum degassing apparatus, and a gas that controls the amount of low moisture gas introduced by a signal from the control means
  • the glass production method of the present invention comprises a step of degassing the molten glass under reduced pressure by setting the water vapor concentration of the atmospheric gas in the vacuum degassing tank to 60 mol% or less, and thereby the vacuum degassing of the molten glass without causing bumping.
  • the effect that foam can be performed is produced.
  • the product has the effect of not causing defects caused by bubbles remaining due to bumping.
  • the glass manufacturing method of this invention can prevent bumping, glass manufacturing can be continued stably.
  • This “stable manufacturing” is a very important factor in quality control for glass manufacturing equipment that operates day and night. This is because once the quality deteriorates, it is necessary to shut down the equipment for repair and adjustment. In addition, it is possible to suppress deposits from adhering to the walls and ceiling of the depressurization defoaming tank from the bumped molten glass, so it is possible to suppress the formation of defects in the glass product due to the fall and improve the quality. .
  • the glass manufacturing method of the present invention reduces moisture in the atmosphere that promotes volatilization of specific components (boron, etc.), it suppresses volatilization of specific components (boron, etc.) in molten glass. There is an effect that can be. And when a glass base plate is manufactured, the deterioration of the flatness can be suppressed.
  • display glass such as liquid crystal glass is strictly regulated in terms of composition, while boron is very volatile, so boron content is rigorously adjusted. There is a need to. Therefore, according to the glass manufacturing method of this invention, it is possible to manufacture efficiently the glass which has the composition and flatness within a specification range.
  • the water vapor concentration is preferably 30 mol% or less.
  • the foam layer is prevented from being enlarged, and thus it is possible to suppress the occurrence of many defects in the glass product (specifically, per unit mass of the glass product). 0.5 bubbles / kg or less).
  • the vacuum degassing apparatus of the present invention can provide a vacuum degassing apparatus suitable for performing the glass manufacturing method of the present invention.
  • FIG. 1 is a diagram showing an example of the configuration of a vacuum degassing apparatus according to the present invention.
  • FIG. 2 is a view showing a vacuum degassing apparatus and the like according to the present invention.
  • FIG. 3 is a diagram showing the results of Example 1 of the present invention.
  • FIG. 4 is a diagram showing the results of Example 3 of the present invention.
  • the glass production method of the present invention comprises a step of defoaming molten glass under a reduced pressure defoaming tank atmosphere gas concentration of 60 mol% or less (hereinafter referred to as “the depressurization defoaming step of the present invention”). . ). And, it is preferable to have a raw material melting step as a pre-process, and it is preferable to have a molding step as a post-process! /. These raw material melting step and molding step are not particularly limited, and may be, for example, a conventionally known step. In addition to these steps, other processes may be provided.
  • Atmosphere gas means an atmosphere gas that fills the space above the molten glass (upper space) inside the vacuum degassing vessel.
  • the reduced-pressure defoaming step of the present invention is a step of defoaming bubbles in the molten glass by flowing the molten glass into a reduced-pressure defoaming tank having a reduced pressure inside.
  • a reduced-pressure defoaming tank having a reduced pressure inside there is no particular limitation as long as it is a step of degassing under reduced pressure with the water vapor concentration of the atmospheric gas in the vacuum degassing tank being 60 mol% or less!
  • this vacuum degassing device Applying a method for adjusting the water vapor concentration of the atmospheric gas in the vacuum degassing tank (hereinafter also referred to as “moisture adjustment method of the present invention”), the water vapor concentration of the atmospheric gas is 60 mol% or less.
  • the reduced-pressure defoaming step of the present invention can be performed.
  • the low moisture gas may be introduced continuously or intermittently.
  • the vacuum degassing step of the present invention to which the moisture adjustment method of the present invention is applied can be performed using, for example, the vacuum degassing apparatus of the present invention.
  • the vacuum degassing apparatus is a vacuum degassing apparatus for degassing molten glass under reduced pressure, wherein the molten glass is allowed to flow inside the reduced pressure state to degas bubbles in the molten glass.
  • FIG. 1 is a view showing a vacuum degassing apparatus 1 which is an example of the configuration of the vacuum degassing apparatus of the present invention.
  • the vacuum degassing tank 12 and the water vapor concentration measuring means 30 included in the vacuum degassing apparatus of the present invention Show low moisture gas introduction means 40!
  • FIG. 2 is a diagram (sectional view) illustrating a vacuum degassing apparatus 10 of the present invention including a vacuum degassing tank 12 (the water vapor concentration measuring means and the low moisture gas introducing means are not described).
  • the cylindrical vacuum degassing tank 12 is housed and arranged in the vacuum housing 11 so that its long axis is oriented in the horizontal direction.
  • a rising pipe 13 oriented in the vertical direction is attached to the lower surface of one end of the vacuum degassing tank 12, and a lowering pipe 14 is attached to the lower surface of the other end.
  • a part of the ascending pipe 13 and the descending pipe 14 is located in the decompression housing 11.
  • the upper surface of the vacuum degassing tank 12 has a plurality of openings. Through at least one opening 6, the low moisture gas 7 is passed from the outside of the vacuum housing 11 to the upper space 5 inside the vacuum degassing tank 12. Introducing power S.
  • An opening 8 formed in the decompression housing 11 is connected to decompression means such as a pump (not shown in FIG. 2; shown as pump 28 in FIG. 1), and is an atmospheric gas 3 that fills the upper space 5 3 Can be discharged to the outside of the vacuum housing 11 (the discharged gas is denoted as atmospheric gas; T), and the pressure inside the vacuum degassing tank 12 can be reduced.
  • the locations of the opening 6 and the opening 8 are not limited to the locations indicated by the opening 6 and the opening 8 in FIG. 2! /, But the opening 6 is on the upstream side of the vacuum degassing tank 12, and the opening 8 is on the downstream side thereof. It ’s better to have it on each side! /,.
  • the opening 6 constituting a part of the low moisture gas introduction means upstream of the vacuum degassing tank 12 the low moisture gas 7 introduced from the opening 6 into the upper space 5 inside the vacuum degassing tank 12 is reduced.
  • the ability to flow from the upstream side of the vacuum degassing tank 12 toward the downstream side where the opening 8 is provided to make the upper space 5 inside the vacuum degassing tank 12 into an atmospheric gas with a uniform low water vapor concentration. S can.
  • a known pressure gauge and thermometer capable of measuring the pressure (P) and temperature (T) of the atmospheric gas 3 are installed in the vacuum degassing tank 12 (not shown).
  • the riser 13 communicates with the vacuum degassing tank 12 and is an introducing means for introducing the molten glass G from the melting tank 20 into the vacuum degassing tank 12. For this reason, the lower end portion of the ascending pipe 13 is fitted into the open end of the upstream pit 22 and is immersed in the molten glass G in the upstream pit 22.
  • the downcomer pipe 14 communicates with the vacuum degassing tank 12 to depressurize the molten glass G after the vacuum degassing. It is a derivation means that descends from the bubble tank 12 and leads to a processing tank (not shown) in a subsequent process. For this reason, the lower end portion of the downcomer pipe 14 is fitted into the open end of the downstream pit 24 and immersed in the molten glass G in the downstream pit 24.
  • a heat insulating material 15 such as a heat insulating brick is provided around the decompression defoaming tank 12, the riser pipe 13, and the downcomer pipe 14 to insulate them.
  • the rising pipe 13 and the lowering pipe 14 are conduits for the molten glass G
  • a material having excellent heat resistance and corrosion resistance to the molten glass is used. It is made using.
  • An example is a hollow tube made of platinum or a platinum alloy. Specific examples of the platinum alloy include a platinum gold alloy and a platinum rhodium alloy.
  • Another example is a hollow tube made of a ceramic non-metallic inorganic material, that is, a dense refractory.
  • the dense refractory include, for example, electric refractories such as alumina electric refractories, dinoleconia electric refractories, alumina-dinoleconia-silica electric refractories, and dense alumina refractories.
  • electric refractories such as alumina electric refractories, dinoleconia electric refractories, alumina-dinoleconia-silica electric refractories, and dense alumina refractories.
  • Dense zirconia silica refractories and dense alumina zirconia silica refractories such as refractories.
  • each component of the vacuum degassing apparatus 10 can be appropriately selected as necessary.
  • the dimensions of the vacuum degassing tank 12 should be appropriately selected according to the vacuum degassing apparatus to be used, regardless of whether the vacuum degassing tank 12 is made of platinum, platinum alloy, or dense refractory. Power S can be. In the case of the vacuum degassing tank 12 shown in FIG. 2, specific examples of the dimensions are as follows.
  • the wall thickness is preferably 4 mm or less, more preferably 0.5 to 1.2 mm.
  • the decompression housing 11 is made of metal, for example, stainless steel, and has a shape and dimensions that can accommodate a decompression deaeration tank.
  • the riser pipe 13 and the downfall pipe 14 can be appropriately selected according to the vacuum degassing apparatus to be used regardless of the force made of platinum, platinum alloy, or dense refractory.
  • the dimensions of the ascending pipe 13 and the descending pipe 14 can be configured as follows. Inner diameter: 0.05—0.8 m, more preferably 0.1—0.6 m
  • Length 0.26m, more preferably 0.44m
  • the wall thickness is preferably 0.45 mm, more preferably 0.84 mm.
  • the vacuum degassing tank of the vacuum degassing apparatus of the present invention is, for example, the vacuum degassing tank 12 having such a configuration.
  • the water vapor concentration measuring means 30 included in the vacuum degassing apparatus of the present invention will be described.
  • the water vapor concentration measuring means 30 is connected to the downstream side of the vacuum degassing tank 12 by piping or the like.
  • a pump 28 as decompression means is connected to the downstream side.
  • the atmospheric gas discharged from the vacuum degassing tank 12; T can be sent S.
  • Atmospheric gas 3 'discharged from pump 28 is released to the atmosphere after purification if necessary.
  • the water vapor concentration measuring means 30 may be a commercially available dew point meter, or a measuring means for measuring the pressure, temperature, gas flow rate and the like of the atmospheric gas 3 'discharged from the vacuum degassing tank 12. It may be. As each measuring means, for example, a conventionally known pressure gauge, thermometer, and gas flow meter can be used.
  • the water vapor concentration is a value representing the amount of water vapor contained in the entire atmospheric gas.
  • the water vapor concentration (C) [mol%] of the atmospheric gas 3 ′ may be measured using a commercially available dew point meter, or alternatively, the water contained in the atmospheric gas; W) It can also be estimated by measuring [g].
  • the water vapor concentration (C) [mol%] in the atmospheric gas 3 ′ is expressed by the following equation (1).
  • the molten glass can be defoamed under reduced pressure without causing bumping, and bubbles are generated due to remaining bubbles in the glass product. Do not cause the defect! / ,! [0028] country
  • the low moisture gas introduction means 40 of the reduced pressure degassing apparatus of the present invention will be described.
  • the low moisture gas introduction means 40 is connected to the upstream side of the reduced pressure defoaming tank 12 by piping or the like. . Then, through this pipe or the like, it is possible to introduce the low moisture gas 7 from the low moisture gas introduction means 40 with the force S.
  • the low moisture gas introduction means 40 includes a low moisture gas generator 41 and a depressurized defoaming tank 12 connected by a pipe or the like.
  • Water gas 7 can be introduced into the upper space 5 of the vacuum degassing tank 12.
  • a flow control valve 42 and a flow meter 44 are provided in this order between the low moisture gas generating device 41 and the vacuum degassing tank 12, and the introduction amount of the low moisture gas 7 can be adjusted with these. it can.
  • the arrangement of the flow control valve 42 and the flow meter 44 may be reversed! /.
  • the low moisture gas introduction means 40 may include introduction means (for example, a high pressure fan) for actively introducing the low moisture gas 7 into the upper space 5 of the vacuum degassing tank 12. Good.
  • introduction means for example, a high pressure fan
  • the upper space 5 and the low moisture gas 7 can be efficiently introduced, which is preferable.
  • the atmosphere is used as the low moisture gas 7
  • the low moisture gas generator described above is used.
  • the above-mentioned water vapor concentration measuring means 30 can measure the gas component of the atmospheric gas 3 'discharged from the upper space 5. Having a component measuring instrument!
  • the low moisture gas is a moisture content higher than the atmospheric gas 3 in the upper space 5.
  • Low moisture gases include air, dry air, N, Examples thereof include an inert gas such as Ar, and there may be a plurality of types as well as one type.
  • the water vapor concentration of the low moisture gas is preferably 0 to 20 mol%, more preferably 0 to 5 mol%, still more preferably O to lmol%.
  • the water vapor concentration of the low moisture gas can be measured using a commercially available outdoor meter.
  • the vacuum degassing apparatus of the present invention is, for example, a vacuum degassing apparatus 1 having such a vacuum degassing tank 12, a water vapor concentration measuring means 30, and a low moisture gas introduction means 40.
  • the low moisture gas introducing means lowers the moisture content.
  • the water vapor concentration of the atmospheric gas in the upper space can be adjusted to a desired concentration by repeating the adjustment as appropriate.
  • the water vapor concentration (C) obtained by the above equation (1) and the target water vapor concentration (C) have the relationship of the following equation (2), so the amount of low moisture gas introduced into the upper space ( F) and lead
  • the force S is used to adjust the water vapor concentration to the target level.
  • V is the introduced gas volume (FX t) [m 3 ] obtained from the introduced amount (F [m 3 / h]) measured by the flow meter 44 and the introduced time (t [h]).
  • FX t the introduced gas volume
  • t the introduced time
  • V is the amount of emissions measured by the flow meter included in the water vapor concentration measuring means 30 (
  • the volume X t) is 0 ⁇ 023 [m 3 ].
  • the vacuum degassing apparatus has a water vapor concentration control unit capable of controlling the water vapor concentration of the atmospheric gas to a desired value, based on a signal from the control unit. It is preferable to further have a gas amount control means for controlling the amount of gas introduced.
  • T, P, F, t, W, S, F, and t are measured constantly and their data are
  • the vacuum degassing apparatus of the present invention has a water vapor concentration control means that can control the water vapor concentration of the upper space to a desired value by the computer. Further, it is preferable that the vacuum degassing apparatus of the present invention has a gas amount control means for enabling the computer to control the opening and closing of the flow rate control valve 42 and feeding back the data of the flow meter 44 to the computer. Furthermore, in order to keep the production performance constant, it is desirable to adjust the flow rate while controlling to a desired pressure.
  • the glass production method of the present invention is preferably carried out using such a vacuum degassing apparatus of the present invention, but other methods may be applied.
  • a vacuum degassing apparatus of the present invention when it is not necessary to introduce gas into the upper space in the depressurization defoaming tank as in the depressurization defoaming apparatus of the present invention, the atmosphere in the depressurization defoaming tank is connected to the atmosphere in the depressurization tank and hooding. The water vapor concentration of the gas in the decompression housing may be reduced.
  • the vacuum degassing treatment conditions are not particularly limited as long as they are within a normal range.
  • the normal pressure treatment conditions are: the atmospheric gas pressure (P) in the upper space inside the vacuum degassing tank is 38 to 460 mmHg (5;! To 613 hPa), and the temperature (T) is 110 ° C to 1500 ° C, especially 1250 ° C ⁇ ; treatment conditions for vacuum degassing at 1450 ° C.
  • the water vapor concentration of the atmospheric gas inside the vacuum degassing tank is set to 60 mol% or less. Then, the bubbles in the molten glass can be degassed under reduced pressure conditions without causing so-called bumping! /.
  • the water vapor concentration of the atmospheric gas inside the vacuum degassing tank is preferably 50 mol% or less, more preferably 40 mol% or less. preferable.
  • a water vapor concentration of 30 mol% or less is preferable because the foam layer tends to be thinner.
  • each bubble may shrink or break, which is preferable because the foam layer becomes thinner.
  • bubbles of a size that can be regarded as a defect in a glass product hardly remain. If the water vapor concentration is lower, the probability of defects occurring in the glass product is further reduced.
  • it is more preferable that it is 25 mol% or less, more preferably 20 mol% or less, and more preferably 15mo 1% or less. More preferably, it is more than S, more preferably 10 mol% or less, and even more preferably 5 mol% or less.
  • bubble shrinkage is a phenomenon that is particularly prominent in molten glass having a specific composition.
  • the glass production method of the present invention, the vacuum degassing apparatus of the present invention, and the moisture adjustment method of the present invention can be preferably used in the case of producing a polysilicate glass.
  • the polysilicate glass has the following composition, for example.
  • Composition range SiO: 55 to 74, Al 2 O: 10 to 20, B 2 O: 5 to; 12 Al 2 O / B 2 O: 1.5
  • volatilization of the volatile components such as Cl, F, and S can be suppressed, so that the composition fluctuation of these components can be prevented and the deterioration of the flatness caused by the composition fluctuation can be suppressed. can do.
  • the glass production method of the present invention, the vacuum degassing apparatus of the present invention, and the water content adjustment method of the present invention are not limited to ordinary glass, and are preferably used particularly when producing a polysilicate glass. If you can do it, sure
  • the low moisture gas introduced into the upper space inside the vacuum degassing tank is preferably a gas having an oxygen concentration lower than the oxygen concentration in the air.
  • the oxygen concentration is preferably 15% by volume or less, more preferably 10% by volume or less, and even more preferably 5% by volume or less.
  • the low moisture gas is preferably a gas not containing oxygen, such as N gas, Ar gas, CO, or the like.
  • the oxygen concentration of the low moisture gas introduced into the upper space is such a value
  • platinum or a platinum alloy is used as the material of the vacuum degassing tank. In this case, the oxidation of the platinum is suppressed, the life of the vacuum degassing tank is extended, and further, the generation of defects derived from platinum in the glass product can be suppressed.
  • the glass manufacturing method of the present invention preferably includes the vacuum degassing step of the present invention, and preferably includes a raw material melting step and a molding step as a pre-process and a post-process.
  • This raw material melting step is, for example, a conventionally known one, for example, a step of melting the raw material by heating to about 1400 ° C. or higher according to the type of glass.
  • the raw material to be used is not particularly limited as long as it is compatible with the glass to be produced. For example, it is possible to use raw materials prepared by mixing conventionally known materials such as cinnabar, boric acid and limestone according to the composition of the final glass product. it can.
  • This raw material may contain the desired fining agent.
  • the molding step may be a conventionally known one, for example, a float molding step, a roll-out molding step, a fusion molding step, or the like.
  • a platinum crucible containing glass raw materials was placed in a vacuum vacuum container.
  • the crucible was heated to melt the glass, and the temperature of the molten glass was adjusted to 1420 ° C. Thereafter, the absolute pressure in the vacuum decompression vessel was set to 26.7 kPa.
  • the composition of the glass raw material used is as follows.
  • Example 1 the thickness of the foam layer was measured with the water vapor concentration of the atmosphere in the vacuum decompression vessel set to 70 mol%, 47 mol%, 31 mol%, and 3 mol%. Furthermore, in Example 1, the low moisture gas, which was air, was changed to N, CO, Ar, and the atmosphere in the vacuum decompression vessel.
  • Example 1 A similar test was conducted with the ambient water vapor concentration being less than lmol%.
  • the glass composition is the same as in Example 1.
  • the thickness of the foam layer becomes 20 mm or more.
  • the water vapor concentration was 3 to 47 mol%, a foam layer having a thickness of about! To 2 mm was formed, but no bumping was confirmed.
  • the atmosphere was N, CO or Ar (water vapor concentration was less than lmol%), no foam layer was formed.
  • the water vapor concentration should be 60 mol% or less.
  • the thickness of the foam layer is 1
  • the shrinkage rate of bubbles in the foam layer was measured for each type of atmosphere.
  • the same porosilicate glass as in Example 1 was used as the molten glass.
  • the results are shown in Fig. 4.
  • the bubble diameter is a normalized value. Normalization is the ratio of the bubble diameter at each time to the bubble diameter when the bubbles inside the molten glass rise and reach the bubble layer. Therefore, the time when the bubble reaches the bubble layer is the elapsed time Os, and the bubble diameter at that time is 1.0.
  • the state of bubbles rising to the surface of the molten glass by vacuum defoaming treatment and then breaking and disappearing was determined using various atmospheric water vapor concentrations (lmol%, 9mol%, 13mol%, 19mol%, 22mol%, 35mol%, 70 mol%) and glass composition (soda lime glass: composition A, composition B, composition C).
  • a 50cc transparent quartz glass beaker was used as a container so that the state of the foam could be observed, and the thickness of the foam layer when about 50 g of glass was melted was measured.
  • the temperature of the molten glass was heated to 1200 ° C.
  • the absolute pressure in the container is 18.7 kPa for composition A, 10.3 kPa for composition B, and 14 for composition C. 4 kPa.
  • the content of each component in Composition A, Composition B, and Composition C was as shown in Table 3 below. In Table 3, “%” indicates mass%.
  • the bumping phenomenon can be prevented and the foam layer can be made thinner, and if the water vapor concentration is further reduced, the bubble breaking rate increases and the bubbles disappear. Turned out to be.
  • the present invention can be applied to a glass manufacturing method including a vacuum degassing apparatus and a vacuum degassing process for molten glass, and is particularly suitable for manufacturing high-quality display glass with few bubbles. It should be noted that the entire contents of the specification, claims, drawings and abstract of Japanese Patent Application No. 2006-233441, filed on August 30, 2006, are hereby incorporated herein by reference. As it is incorporated.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Glass Compositions (AREA)
  • Degasification And Air Bubble Elimination (AREA)

Abstract

L'invention concerne un procédé d'élimination de la mousse sous vide sans bosselage dans la fabrication de verre ; un procédé d'élimination de la mousse sous vide sans laisser de bulles dans les articles en verre dans la fabrication de verre, lesquelles bulles résultent de la dilatation d'une couche de mousse ; et un procédé d'élimination de la mousse sous vide en inhibant la vaporisation de composants spécifiques (tels que le bore) contenus dans le verre fondu dans la fabrication de verre. Un procédé de fabrication du verre selon la présente invention comprend l'étape consistant à éliminer la mousse sous vide dans le verre fondu dans une cuve d'élimination de la mousse sous vide, la concentration en vapeur d'eau du gaz atmosphérique dans la cuve étant contrôlée pour être inférieure ou égale à 60 % en moles.
PCT/JP2007/066490 2006-08-30 2007-08-24 Procédés de fabrication de verre WO2008029649A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2008533101A JP5434077B2 (ja) 2006-08-30 2007-08-24 ガラス製造方法
KR1020097000999A KR101419957B1 (ko) 2006-08-30 2007-08-24 유리 제조 방법

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006-233441 2006-08-30
JP2006233441 2006-08-30

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WO2008029649A1 true WO2008029649A1 (fr) 2008-03-13

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PCT/JP2007/066490 WO2008029649A1 (fr) 2006-08-30 2007-08-24 Procédés de fabrication de verre

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JP (1) JP5434077B2 (fr)
KR (1) KR101419957B1 (fr)
CN (2) CN101506109A (fr)
TW (1) TWI394725B (fr)
WO (1) WO2008029649A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009107801A1 (fr) * 2008-02-29 2009-09-03 旭硝子株式会社 Appareil de démoussage sous vide pour du verre fondu
WO2011007840A1 (fr) * 2009-07-16 2011-01-20 旭硝子株式会社 Procédé de fabrication de verre fondu, appareil de dégazage sous vide et procédé de fabrication d'un produit de verre
JP2015086131A (ja) * 2013-09-25 2015-05-07 ＡｖａｎＳｔｒａｔｅ株式会社 ガラス基板の製造方法、及びガラス基板の製造装置
JP2015199639A (ja) * 2014-03-31 2015-11-12 ＡｖａｎＳｔｒａｔｅ株式会社 ガラス基板の製造方法およびガラス基板の製造装置
JP2016069253A (ja) * 2014-09-30 2016-05-09 ＡｖａｎＳｔｒａｔｅ株式会社 ガラス基板の製造方法、及び、ガラス基板の製造装置
JP2016069262A (ja) * 2014-10-01 2016-05-09 ＡｖａｎＳｔｒａｔｅ株式会社 ガラス基板の製造方法、及び、ガラス基板の製造装置
US9676643B2 (en) 2012-02-22 2017-06-13 Schott Ag Method for producing glasses, glass ceramics and the use of same
US20200331789A1 (en) * 2017-12-22 2020-10-22 Nippon Electric Glass Co., Ltd. Method for producing glass article and glass-melting furnace
WO2022215505A1 (fr) * 2021-04-07 2022-10-13 日本電気硝子株式会社 Procédé de production de verre
US11505487B2 (en) 2017-03-16 2022-11-22 Corning Incorporated Method for decreasing bubble lifetime on a glass melt surface
US11655176B2 (en) 2018-11-21 2023-05-23 Corning Incorporated Method for decreasing bubble lifetime on a glass melt surface

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011145526A1 (fr) * 2010-05-19 2011-11-24 旭硝子株式会社 Dispositif de réduction de pression et de démoussage pour du verre fondu, procédé de fabrication de verre fondu, et procédé de fabrication de produit de verre
CN102898016A (zh) * 2012-08-06 2013-01-30 彩虹显示器件股份有限公司 抑制tft‐lcd 基板玻璃气泡产生的装置及方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11255519A (ja) * 1998-03-11 1999-09-21 Asahi Glass Co Ltd 溶融ガラスの減圧脱泡装置
JP2004091307A (ja) * 2002-07-10 2004-03-25 Nippon Electric Glass Co Ltd ガラス製造方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4321373C2 (de) * 1993-06-26 1995-12-14 Schott Glaswerke Glaskeramik mit hoher Transmission im Wellenlängenbereich von 2700 bis 3300 nm, Verfahren zu deren Herstellung und deren Verwendung
JP2002293547A (ja) * 2001-03-28 2002-10-09 Asahi Glass Co Ltd 陰極線管用ガラスの製造方法
EP1293487A1 (fr) * 2001-09-14 2003-03-19 Asahi Glass Co., Ltd. Appareil de dégazage sous vide de verre fondu

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11255519A (ja) * 1998-03-11 1999-09-21 Asahi Glass Co Ltd 溶融ガラスの減圧脱泡装置
JP2004091307A (ja) * 2002-07-10 2004-03-25 Nippon Electric Glass Co Ltd ガラス製造方法

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Publication number Priority date Publication date Assignee Title
WO2009107801A1 (fr) * 2008-02-29 2009-09-03 旭硝子株式会社 Appareil de démoussage sous vide pour du verre fondu
WO2011007840A1 (fr) * 2009-07-16 2011-01-20 旭硝子株式会社 Procédé de fabrication de verre fondu, appareil de dégazage sous vide et procédé de fabrication d'un produit de verre
CN102471116A (zh) * 2009-07-16 2012-05-23 旭硝子株式会社 熔融玻璃制造方法、减压脱泡装置以及玻璃制品的制造方法
KR101341741B1 (ko) 2009-07-16 2013-12-16 아사히 가라스 가부시키가이샤 용융 유리 제조 방법 및 감압 탈포 장치, 그리고 유리 제품의 제조 방법
JP5387678B2 (ja) * 2009-07-16 2014-01-15 旭硝子株式会社 溶融ガラス製造方法および減圧脱泡装置、ならびにガラス製品の製造方法
CN102471116B (zh) * 2009-07-16 2015-03-11 旭硝子株式会社 熔融玻璃制造方法、减压脱泡装置以及玻璃制品的制造方法
US9676643B2 (en) 2012-02-22 2017-06-13 Schott Ag Method for producing glasses, glass ceramics and the use of same
JP2015086131A (ja) * 2013-09-25 2015-05-07 ＡｖａｎＳｔｒａｔｅ株式会社 ガラス基板の製造方法、及びガラス基板の製造装置
JP2015199639A (ja) * 2014-03-31 2015-11-12 ＡｖａｎＳｔｒａｔｅ株式会社 ガラス基板の製造方法およびガラス基板の製造装置
JP2016069253A (ja) * 2014-09-30 2016-05-09 ＡｖａｎＳｔｒａｔｅ株式会社 ガラス基板の製造方法、及び、ガラス基板の製造装置
JP2016069262A (ja) * 2014-10-01 2016-05-09 ＡｖａｎＳｔｒａｔｅ株式会社 ガラス基板の製造方法、及び、ガラス基板の製造装置
US11505487B2 (en) 2017-03-16 2022-11-22 Corning Incorporated Method for decreasing bubble lifetime on a glass melt surface
US20200331789A1 (en) * 2017-12-22 2020-10-22 Nippon Electric Glass Co., Ltd. Method for producing glass article and glass-melting furnace
US11655176B2 (en) 2018-11-21 2023-05-23 Corning Incorporated Method for decreasing bubble lifetime on a glass melt surface
WO2022215505A1 (fr) * 2021-04-07 2022-10-13 日本電気硝子株式会社 Procédé de production de verre

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CN104445869B (zh) 2018-07-27
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CN104445869A (zh) 2015-03-25
CN101506109A (zh) 2009-08-12
TWI394725B (zh) 2013-05-01
KR101419957B1 (ko) 2014-07-16
JPWO2008029649A1 (ja) 2010-01-21
JP5434077B2 (ja) 2014-03-05

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