CN101774749A - Isopipe material outgassing - Google Patents

Isopipe material outgassing Download PDF

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Publication number
CN101774749A
CN101774749A CN200910225830A CN200910225830A CN101774749A CN 101774749 A CN101774749 A CN 101774749A CN 200910225830 A CN200910225830 A CN 200910225830A CN 200910225830 A CN200910225830 A CN 200910225830A CN 101774749 A CN101774749 A CN 101774749A
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glass
glass melt
fire
normal operation
temperature
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CN101774749B (en
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D·J·利布奈
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Corning Inc
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Corning Inc
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    • 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
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
    • C03B17/06—Forming glass sheets
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
    • C03B17/06—Forming glass sheets
    • C03B17/064—Forming glass sheets by the overflow downdraw fusion process; Isopipes therefor
    • 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

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

Abstract

A method for shortening the minimal time required to introduce the defect of glass plate manufactured by molten glass material in the isopipe. The method includes: a step of heating the glass melt so that the temperature in the outgassing stage is high than that in the normal operation stage, and the viscosity coefficient in the outgassing stage is lower than that in the normal operation stage, so that the outgassing stage is quickened.

Description

Isopipe material outgassing
The application requires the right of priority of No. the 61/117267th, the U.S. Patent application submitted on November 24th, 2008.
Technical field
The application relates to the method for making glass.Specifically, the present invention relates to make the method for glass, wherein, glass melt must contact the fire-resistant body of the initial degassing.During the present invention is applicable to that the fusion of the slab glass that for example is used as the LCD glass substrate is shaped.
Background technology
In the method (comprising float glass process, slot draw, pressing, rolling etc.) of making glasswork, glass material at first fusion is usually chosen wantonly and is carried out clarification and homogenization, is delivered to the shape that building mortion is configured as to be needed then, then cooling.In fusion, clarification, homogenizing, send and shaping, usually use the equipment or the container that comprise refractory materials to handle glass melt.These refractory materialss comprise stupalith etc., for example zircon base pottery, zirconia-based ceramics, aluminium titanate base pottery, other oxide-base potteries, precious metal etc.Many these materials are made by the particle sintering, and the particle sintering can cause forming and existing space and crystal boundary slit in the finished product, and these spaces and crystal boundary slit meeting captured gas be air for example.And when being installed in refractory materials in the glass making system for the first time, the surface of refractory materials can a certain amount of gas of adsorption/absorption.During the starting stage in glass production cycle, when the surface of refractory materials contact glass melt, gas can enter glass melt and form unfavourable defect.For example be used for the glass substrate of LCD display for the opticglass product, the permissible level of bubble is very low in the glass.Therefore, during the starting stage in glass production cycle, do not have to abandon or the recirculation glassy product because meeting quality requirements usually.This fs production cycle that is subjected to refractory materials degassing influence is called " deaeration stage ".Need not put speech, deaeration stage has obvious influence to the output and the productivity of glass making system.
Can be used for making in the glass-making processes of the sheets of glass that is applicable to the LCD display substrate at all, (healthy and free from worry (the Corning of New York, United States of Corning Corp. (Corning Incorporated), New York, U.S.A.)) exploitation and improved fusion drawing are preferable methods, reason is high surface quality, thickness and other physical propertiess of product, do not need further downstream surface to grind or polishing step, or the like.Described fusion process in United States Patent (USP) the 3338696th and No. 3682609, its content is by with reference to being incorporated into this.
The same with other glass-making processes, in fusion process, at glass melting, send, make glass melt contact the refractory materials of the initial degassing during homogenizing and the forming step.Specifically, during forming step, former (being called " overflow groove ") has large surface area, and glass melt must flow through on this surface-area then and be configured as sheet glass at this equipment root.During the production cycle Isopipe material is initially outgased, portion's captured gas causes forming bubble in sheet glass within it.Under common glass melting condition, deaeration stage may reach some months, and this is very disadvantageous.
Therefore, need to shorten deaeration stage during the glass manufacturing process really.The present invention has satisfied this demand.
Summary of the invention
The invention provides a kind of method of making glasswork, this method comprises makes glass melt contact with the surface of the fire-resistant body of the initial degassing, be included in normal operation phase (normal operation phase) deaeration stage before, wherein: (i) during deaeration stage, the average viscosity that contacts the glass melt of fire-resistant body is η 1, (ii) during normal operation phase, the average viscosity that contacts the glass melt of fire-resistant body is η 2, and (iii) the ratio of η 2/ η 1 is at least 1.05, be at least 1.10 in some embodiments, be at least 1.20 in some embodiments, be at least 1.30 in some embodiments, be at least 1.40 in some embodiments, be at least 1.50 in some embodiments, be at least 1.60 in some embodiments, be at least 1.70 in some embodiments, be at least 1.80 in some embodiments, be at least 1.90 in some embodiments, be at least 2.00 in some embodiments.
In some embodiments of the inventive method, the fire-resistant body of contact glass melt comprises pottery.
In some embodiments of the inventive method, the fire-resistant body of contact glass melt comprises and is selected from following pottery: zircon, zirconium white, YPO 4, Al 2O 3, SiO 2, SiC, SiN, and their combination and mixture.
In some embodiments of the inventive method, this method comprises the fusion glass tube down-drawing that is used to make sheet glass, and fire-resistant body comprises overflow groove.
In some embodiments of the inventive method, the time length of deaeration stage is enough to make glass melt to cover all areas that will contact the fire-resistant surface of glass melt during the normal operation phase.
In some embodiments of the inventive method, deaeration stage comprises the step of the inclined position during making overflow groove with respect to normal operation phase, and the pitch angle is θ ,-5 °≤θ≤5 °.In some embodiments of the inventive method ,-5 °≤θ≤3 °.In some embodiments of the inventive method, deaeration stage comprises first tilting step, wherein-5 °≤θ≤0 °, and second tilting step, and 0＜θ≤5 ° wherein.
In some embodiments of the inventive method, η 2 〉=1000 pools, η 2 〉=2000 moors in some embodiments, η 2 〉=3000 moors in some embodiments, η 2 〉=4000 moors in some embodiments, η 2 〉=5000 moors in some embodiments, η 2 〉=6000 moors in some embodiments, η 2 〉=8000 moors in some embodiments, η 2 〉=10000 moors in some embodiments, η 2 〉=15000 pools in some other embodiments, η 2 〉=18000 pools in some other embodiments, η 2 〉=20000 pools in some embodiments.
In some embodiments of the inventive method, the mean flow rate of glass melt during deaeration stage is FR1, glass melt is FR2 at the mean flow rate of normal operation phase, the ratio of FR1/FR2 is 0.2-0.8, being 0.3-0.7 in some embodiments, is 0.3-0.5 in some other embodiments.
In some embodiments of the inventive method, corresponding to the temperature T of glass melt viscosities il 2 2Be at least 1000 ℃, be at least 1050 ℃ in some embodiments, be at least 1100 ℃ in some embodiments, be at least 1200 ℃ in some embodiments, be at least 1250 ℃ in some embodiments.
In some embodiments of the inventive method, corresponding to the temperature T of glass melt viscosities il 1 1Be at least 1000 ℃, be at least 1100 ℃ in some embodiments, be at least 1200 ℃ in some embodiments, be at least 1300 ℃ in some embodiments, be at least 1400 ℃ in some embodiments, be at least 1500 ℃ in some embodiments, be at least 1600 ℃ in some embodiments.
In some embodiments of the inventive method, for glass melt, corresponding to the temperature T of viscosities il 1 1With temperature T corresponding to viscosities il 2 2Has following relation: T 1-T 2〉=50 ℃, T in some embodiments 1-T 2〉=100 ℃, T in some embodiments 1-T 2〉=150 ℃, T in some embodiments 1-T 2〉=200 ℃.
In some embodiments of the inventive method, the time length of deaeration stage is 10-800 hour, be 20-800 hour in some embodiments, be 30-800 hour in some embodiments, be 30-700 hour in some embodiments, be 30-600 hour in some embodiments, be 30-500 hour in some embodiments, be 30-400 hour in some embodiments, be 30-300 hour in some embodiments, be 50-700 hour in some embodiments, being 50-600 hour in some embodiments, is 50-500 hour in some embodiments, is 50-400 hour in some embodiments, being 50-300 hour in some embodiments, is 50-250 hour in some embodiments.
One or more embodiments of the present invention have one or more following advantages.The temperature of the glass melt contact with refractory materials in deaeration stage by raising can reduce the viscosity of glass melt.The viscosity of glass melt promotes glass melt wetting to fire-resistant surface than low energy, promote that glass melt penetrates in the open pores and space that may exist in the fire-resistant body, make the gas release that captured by fire-resistant body or absorb/adsorb, float, discharge and escape, thereby the fire-resistant body degassing time that will significantly reduce glassy product output shortens.In essence, the comparatively high temps of glass melt and can shorten the degassing time than low viscosity during the deaeration stage enters normal operation phase earlier, and improves the overall productivity of glass making system.And, tilt in deaeration stage by making overflow groove, or tilt up or down, or both combinations, further reinforced glass melt is wetting to fire-resistant surface.In addition,, reduce the waste of glass material, further improve the output of glass-making processes by reducing the flow velocity of glass melt during deaeration stage.The present invention can be used to especially valuably make and has high surface and the body fusion drawing of the slab glass of quality mutually.
Those skilled in the art are after the detailed description of considering following example embodiment, and other features and advantages of the present invention will be conspicuous.
Brief Description Of Drawings
Below with reference to the accompanying drawing that example embodiment of the present invention is shown, each side of the present invention is described more specifically.
Fig. 1 is the schema of explanation example glass making system of the present invention.
Fig. 2 is a skeleton view of making the overflow groove in the overflow down draw fusion process of glass plate.
Fig. 3 is an overflow groove shown in Figure 2 side-view at level attitude.
Fig. 4 is an overflow groove shown in Figure 2 side-view in first obliquity.
Fig. 5 is an overflow groove shown in Figure 2 side-view in second obliquity.
Describe in detail
As previously mentioned, be mixed in the refractory material or its lip-deep gas during glass manufacturing process, can enter the contact fire-resistant surface glass melt in. Replace this gas with glass melt and can reduce time dependent amount of gas evolved. Glass-filled advances in the hole of fire-resistant body and the space or displacement absorbs in fire-resistant surface/and the speed of the gas of absorption depends on temperature and the viscosity of glass melt and the temperature of fire-resistant body. The viscosity of glass melt is more low, or temperature is more high, and then glass melt just can more quickly flow through the surface, thereby glass melt can more quickly wetting any Free Surface, comprises unlimited hole and the surface in space. The temperature of gas is more high, and the viscosity of glass melt is more low, and then the gas in the glass melt just can more quickly float, and finally escapes from the surface of glass melt. It is advantageous particularly and useful shortening deaeration stage and entering as early as possible normal operation phase. As used herein, " normal operation phase " is illustrated in a stage in the production cycle, in this stage, to the target output of production cycle, can allow the degassed of fire-resistant body. Should be noted that the glass for appointment forms, normal operation phase changes according to equipment and throughput objectives. Therefore, can be in the normal operation phase of different glass production line, at the essentially identical glass plate of the lower production of the operating condition (temperature of glass melt, flow velocity, viscosity etc.) of slightly microvariations.
In the present invention, during the deaeration stage of production cycle, glass and fire-resistant body all are heated above the temperature of temperature during the normal operation phase, make the average viscosity η 1 of glass melt during the deaeration stage be lower than the average viscosity η 2 of glass melt during the normal operation phase, wherein η 2/ η 1 is at least 1.05. In some embodiments, η 2/ η 1 〉=1.10, η 2/ η 1 〉=1.20 in some other embodiments, η 2/ η 1 〉=1.30 in some other embodiments, η 2/ η 1 〉=1.40 in some other embodiments, η 2/ η 1 〉=1.50 in some other embodiments, η 2/ η 1 〉=1.60 in some other embodiments, η 2/ η 1 〉=1.70 in some other embodiments, η 2/ η 1 〉=1.80 in some other embodiments, η 2/ η 1 〉=1.90 in some other embodiments, η 2/ η 1 〉=2.00 in some other embodiments.
Carrying out when of the present invention, glass melt and whole glass melting, sending the temperature that can be heated above their normal running temperatures in some embodiments with formation system. These embodiments may be useful for the production cycle of the new system of beginning, and whole fire-resistant bodies contact glass melt for the first time in the new system. In other embodiments, the degassed temperature that segment glass manufacturing system and the glass melt that is in contact with it is heated above normal running temperature simultaneously the temperature of other parts of system is remained on normal running temperature or even to be lower than normal running temperature may be useful. After the production cycle, change or when rebuilding the part glass making system, these embodiments may be useful. Glass making system can comprise a plurality of districts that are equipped with independent heat control device, these devices can to glass melt and only the system in an independent district carry out differential heating (differential heating). Can also in a plurality of districts, carry out simultaneously at least in part deaeration stage, with the degree that is different from its normal running temperature raise these the district in temperature.
To be to make the situation of overflow launder of fusion drawing of glass plate present invention is described with regard to fire-resistant body below. But, those skilled in the art can understand, can apply the present invention to fuse other parts of drawn glass manufacturing system, and be applied to other glass-making processes, such as float glass process, slot draw, pressing, casting, rolling etc. is so long as exist the method for the degassed problem of the refractory material that contacts with glass melt.
Referring to Fig. 1, show the schematic diagram that uses drop-down fusion process to make the example glass making system 100 of glass plate 102. Glass making system 100 comprises melt container 104, clarification container 106, mixer 108 (for example the teeter chamber 108), delivery container 110 (for example bowl 110) and forming containers 112 (for example overflow launder 112). Melt container 104 is the positions of introducing glass batch materials and melting formation melten glass 116 shown in arrow 114. Clarification container 106 (for example finer 106) is accepted melten glass 116 (not showing at this point) and remove bubble from melten glass 116 from melt container 104. Clarification container 106 is connected to mixer 108 (for example the teeter chamber 108) by clarifier to the tube connector 118 of teeter chamber. Mixer 108 by the teeter chamber to the bowl tube connector 120 be connected to delivery container 110. Delivery container 110 sends by downcomer 122 melten glass 116 to import 124 and enter in the forming containers 112 (for example overflow launder 112), is configured as glass plate 102. Forming containers 112 (for example overflow launder 112) is made by the zircon refractory material.
Referring to Fig. 2, show the perspective view of the overflow launder 112 that uses in the glass making system 100. Overflow launder 112 comprises opening (import) 130, and it accepts melten glass 116, and this melted material flows in groove 132, then overflow and flow downward, fuse together in the position 136 that is called root then from both sides 134a and 134b. Both sides 134a and 134b join at root 136 places, and two overflow wall of melten glass 116 are rejoined at root, and drawing then also downwards, cooling forming is glass plate 102. Should be appreciated that overflow launder 112 and glass making system 100 can have is different from the structure shown in Fig. 1 and 2 and assembly, but still is considered as dropping in the scope of the invention.
Can use the refractory material manufacturing of refractory and refractory metal and so on to make the overflow launder of glass-pane shaping. Because generally glass melt is heated to the temperature of rising, thus require overflow launder under the operating temperature that raises, to have thermal property and engineering properties, with the steady production cycle that guarantees to prolong. A kind of critical nature of Isopipe material is the thermal creep rate, in time sagging of this property effect overflow launder. Because overflow launder is a kind of structure of elongation, so a small amount of sagging accumulation in time can cause the obvious deterioration of product quality. Can use ZrO2、ZrSiO 4、TiO 2、SiC、SiN、Al 2(TiO 3)、YPO 4Deng and so on refractory ceramic material make overflow launder. Manufactured materials and the method for the overflow launder that is used for fusion drawn glass autofrettage for example are provided among PCT patent disclosure WO 2006/073841 (open day on July 13rd, 2006), the PCT patent disclosure WO 02/44102 (open day on June 6th, 2002), and the content of these documents is incorporated into this by reference in its entirety.
When overflow launder new or that repolish for the first time for the production of the cycle in the time, require it before normal operation phase begins, experience initial deaeration stage, could continue like this glass plate that has required bubble inclusion level with stably production. Therefore, the glass melt that is loaded into overflow launder is heated above its temperature T during the normal operation phase2Temperature T1 Overflow launder is heated above valuably the temperature of its temperature during the normal operation phase by glass melt, overflow launder thermal control system or the two. As discussed above, glass melt will promote surface of overflow groove wetting of contact glass melt than low viscosity, occupy open pores and space in the overflow launder, the gas that discharge is carried secretly, absorbed or adsorb by overflow launder, cause shortening deaeration stage, the air blister defect in the glass plate that will produce during the normal operation phase is reduced.
During deaeration stage, require to make the glass melt contact and wettingly will during normal operation phase, contact all surfaces of the overflow launder of glass melt. In some embodiments, it is more fast that glass melt is finished wetting whole surface, just can finish more soon deaeration stage. Therefore, except glass melt being heated to higher temperature and than the low viscosity, the present invention further comprises and accelerates the various approach that glass melt flows at surface of overflow groove.
The approach that a kind of such quickening glass melt flows at surface of overflow groove relates to makes overflow launder tilt with respect to its normal position during normal operation phase. In some embodiments, during normal operating, it is very favorable making the overflow launder root keep basic horizontal,, makes its direction that is basically perpendicular to gravitational vectors that is, thereby produces the glass plate with thickness and even character. In order to accelerate glass melt flowing on surface of overflow groove, and accelerate especially surface, weir wetting of all surfaces, require to make the root of overflow launder with respect to its inclined during normal operation phase. Can tilt with respect to other end rising or reduction by the end with overflow launder. If an end is designed to fix (even two ends can both be moved with respect to the 3rd Reference) with respect to the other end, then the other end is designed to the tiltable end. When with respect to its position rising tiltable end during normal operation phase, think that tiltangleθ (being the angle between overflow launder root and the horizontal line (or the overflow launder root during the normal operation phase)) is positive, when reducing the tiltable end, think that tiltangleθ bears. Because overflow launder may be big and heavy, so-5 ° to 5 ° inclination angle is favourable, is-5 ° to 3 ° in some embodiments. In some embodiments, require overflow launder is carried out first tilting step of-5 °≤θ＜0 (downward-sloping) and second tilting step of 0＜θ≤5 ° (being inclined upwardly). This two step tilt operation can be accelerated the wetting of both sides surface of overflow groove.
The glass of producing during deaeration stage may produce various defectives because of the overflow launder operating condition of degassed problem and not enough optimization. But, and be not precluded within during the deaeration stage especially in latter stage, the glass of production may meet the quality requirements of some application. But in some embodiments, the glass quality of producing during deaeration stage is low, should reduce as far as possible output. For this reason, requiring the glass melt mean flow rate (FR1) during the deaeration stage is reduced to the 20-80% of the flow velocity (FR2) during the normal operations stage, is 30-70% in some embodiments, is 30-50% in some embodiments.
Temperature (the T of glass melt during the normal operation phase2) and viscosity (η 2) depend on some factors, comprise the thickness of glass composition, method productivity ratio, glass product requirement and other attributes etc. In some embodiments of the inventive method, when glass during for the manufacture of the LCD glass substrate, corresponding to the temperature T of glass melt viscosities il 22Be at least 1000 ℃, be at least in some embodiments 1050 ℃, be at least in some embodiments 1100 ℃, be at least in some embodiments 1200 ℃, be at least in some embodiments 1250 ℃.
Temperature (the T of glass melt during deaeration stage1) and viscosity (η 1) depend on some factors, comprise that glass forms, glass is sent and high temperature tolerance limit of former etc. In some embodiments of the inventive method, corresponding to the temperature T of glass melt viscosities il 11Be at least 1000 ℃, be at least in some embodiments 1100 ℃, be at least in some embodiments 1200 ℃, be at least in some embodiments 1300 ℃, be at least in some embodiments 1400 ℃, be at least in some embodiments 1500 ℃, be at least in some embodiments 1600 ℃. Often use platinum or its alloy as the glass melt treatment facility of producing high-quality optical glass, reason is heat-resisting quantity and the oxidative resistance of platinum or its alloy. If when sending and process glass melt, use platinum or platinum alloy, then glass melt can not be heated to above platinum or the out of order temperature of its alloy.
Temperature contrast bigger between deaeration stage and the normal operation phase can be accelerated deaeration stage to a greater degree. In some embodiments of the inventive method, for glass melt, corresponding to the temperature T of viscosities il 11With the temperature T corresponding to viscosities il 22Has following relation: T1-T 2〉=50 ℃, T in some embodiments1-T 2〉=100 ℃, T in these some embodiments1-T 2〉=150 ℃, T in some embodiments1-T 2〉=200 ℃. But, keep the stability of a system, require in some embodiments glass system or its assembly for example overflow launder can not be heated to too high temperature. That is, require in some embodiments T1-T 2≤ 250 ℃, T in some embodiments1-T 2≤ 200 ℃, T in some embodiments1-T 2≤ 150 ℃, T in some embodiments1-T 2≤ 100 ℃, T in some embodiments1-T 2≤80℃。
By making degassing temperature (T 1) be higher than the temperature (T during the normal operation phase 2), about T 1=T 2Situation, can significantly shorten deaeration stage.Because T 1=T 2The time deaeration stage may be very tediously long (for example surpassing for 5 weeks), even shorten deaeration stage slightly and all can cause the production cycle of significant prolongation system and improve overall productivity.In some embodiments of the inventive method, the time length of deaeration stage is 10-800 hour, be 20-800 hour in some embodiments, be 30-800 hour in some embodiments, be 30-700 hour in some embodiments, be 30-600 hour in some embodiments, be 30-500 hour in some embodiments, be 30-400 hour in some embodiments, be 30-300 hour in some embodiments, be 50-700 hour in some embodiments, being 50-600 hour in some embodiments, is 50-500 hour in some embodiments, is 50-400 hour in some embodiments, being 50-300 hour in some embodiments, is 50-250 hour in some embodiments.
The preferred embodiment for the present invention
Following non-limiting example further specifies the present invention of prescription.
Therefore for example, in some embodiments, reduce the quantity of degassing bubble in the sheet glass, before glass delivery is delivered to overflow groove 112, overflow groove 112 and delivery container 110 are heated to above normal running temperature.Then with 50% the viscosity that is about viscosity during the normal running with molten glass delivery to overflow groove 112, with reference to the straight line shown in Fig. 3 140 overflow groove 112 is placed with level attitude simultaneously.This position can be called zero reference position, make the root 136 of overflow groove be parallel to sea line or perpendicular to gravity direction.
In some embodiments, form for the glass of concrete selection, during deaeration stage, its viscosity is about 8000 pools when glass melt washes away to surface of overflow groove.
Heating viscous glass temperature elevation process when realizing the temperature of minimum liquidus viscosity should not can cause undesirable damage to overflow groove and glass delivery system.For example, when sending glass by the Pt system, but the MV minium viscosity of the top temperature of glass melt and consequent glass melt is subjected to the restriction of Pt operating temperature range.
In some embodiments, by the import of overflow groove one end glass melt is introduced in the overflow groove.The opposite end is called " being subjected to pressure side " 144.The pressure side 144 that is subjected to of " downward-sloping " expression overflow groove is lower than entrance end 146, and perhaps the root 136 of overflow groove 112 becomes negative angle with respect to sea line, as shown in Figure 4.When being inclined upwardly, the pressure side 144 that is subjected to of overflow groove is higher than entrance end 146.The root of overflow groove becomes positive angle with respect to sea line, as shown in Figure 5.
Heating and melting glass and when being delivered to overflow groove 112 with 50% the viscosity that is about normal running viscosity during the normal operation phase slopes down to overflow groove 112 downward-sloping position as shown in Figure 4 at once.Viscous glass is flowed and cover some areas of overflow groove, continue 12-48 hour.During this was downward-sloping, the part (for example about 1/3rd) towards end 144 places relative with ingress 130 on the overflow groove was covered by glass melt.In downward-sloping operation ,-5 °≤θ＜0 °, in some embodiments-3 °≤θ＜0 °.
Keeping down obliquity after the scheduled time, overflow groove is inclined upwardly and in 12-24 hour elevated temperature make the part (about 1/3) at 130 places, the end of sending glass of overflow groove wetting to viscosity about 66% for operation viscosity by glass.The position that is inclined upwardly is 0 °＜θ≤5 °, in some embodiments 0 °＜θ≤3 °.Though overflow groove 112 was kept this position 12-24 hour, the surface of the initial wetting of residual glass contact overflow groove is still arranged, and the air inerchange in the hole of continuation and overflow groove 112.
When downward-sloping step finishes, make overflow groove be in work point, make glass melt and overflow groove be in service temperature.The flow velocity that can also regulate glass melt is to adapt to the needs of normal operation phase.At this moment begin normal productive process, provide the number of defects that comprises the least possible sheet glass.
Though more than disclosed the example embodiment in conjunction with principle of the present invention, content of the present invention is not limited to the embodiment that disclosed.For example, the present invention is not limited to 6 assemblies, still less or more assembly also drop within the scope of the invention.In addition, the application is intended to cover various variations, application or the modification of using General Principle of the present invention.And the application is intended to cover the content that is different from this paper announcement that the field is known or convention is implemented under the present invention.

Claims (10)

1. method that is used to make glasswork, this method comprises: the surface that makes the fire-resistant body of the initial degassing of glass melt contact, be included in normal operation phase deaeration stage before, wherein: (i) during deaeration stage, the average viscosity that contacts the glass melt of fire-resistant body is η 1, (ii) during normal operation phase, the average viscosity that contacts the glass melt of fire-resistant body is η 2, and (iii) the ratio of η 2/ η 1 is at least 1.05.
2. the method for manufacturing glasswork as claimed in claim 1 is characterized in that, the fire-resistant body of contact glass melt comprises and is selected from following pottery: zircon, zirconium white, YPO 4, Al 2O 3, SiO 2, SiC, SiN and combination and mixture.
3. the method for manufacturing glasswork as claimed in claim 1 or 2 is characterized in that, this method is the fusion glass tube down-drawing that is used to make sheet glass, and fire-resistant body comprises overflow groove.
4. the method for each described manufacturing glasswork in the claim as described above is characterized in that the time length of deaeration stage is enough to make glass melt to cover the entire area on the surface that will contact with glass melt in the fire-resistant body during normal operation phase.
5. as the method for claim 3 or 4 described manufacturing glassworks, it is characterized in that deaeration stage comprises the step of the inclined position during making overflow groove with respect to normal operation phase, the pitch angle is θ ,-5 °≤θ≤5 °.
6. the method for manufacturing glasswork as claimed in claim 5 is characterized in that, deaeration stage comprises first tilting step, wherein-5 °≤θ＜0 °, and second tilting step, and 0＜θ≤5 ° wherein.
7. the method for each described manufacturing glasswork in the claim as described above, it is characterized in that, the mean flow rate of glass melt during deaeration stage is FR1, and the mean flow rate of glass melt during normal operation phase is FR2, and the ratio of FR1/FR2 is 0.2-0.8.
8. the method for each described manufacturing glasswork in the claim as described above is characterized in that, corresponding to the temperature T of glass melt viscosities il 2 2Be at least 1000 ℃.
9. the method for each described manufacturing glasswork in the claim as described above is characterized in that, for glass melt, corresponding to the temperature T of viscosities il 1 1With temperature T corresponding to viscosities il 2 2Possesses following relation: T 1-T 2〉=50 ℃.
10. the method for each described manufacturing glasswork in the claim as described above is characterized in that the time length of deaeration stage is 10-800 hour.
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