CN101012098B - Temperature equality device and temperature equality method in glass forming - Google Patents
Temperature equality device and temperature equality method in glass forming Download PDFInfo
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- CN101012098B CN101012098B CN2007100538828A CN200710053882A CN101012098B CN 101012098 B CN101012098 B CN 101012098B CN 2007100538828 A CN2007100538828 A CN 2007100538828A CN 200710053882 A CN200710053882 A CN 200710053882A CN 101012098 B CN101012098 B CN 101012098B
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- glass
- temperature
- heating unit
- plate
- temperature equal
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- 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
Abstract
The invention discloses a temperature evening device and method in the glass moulding course, which comprises the following parts: moulding bulk to overflow fusing glass, heating moulding space with top heating element and lateral heating element, insulating part on the exterior of top heating element and lateral wall heating element, board-shaped temperature evening device on the periphery between overflow glass liquid moulding bulk and heating element, wherein the board-shaped temperature evening device gathers glass fusing heat to heat glass at face irradiation pattern, which makes glass flow obtain even temperature; the distance between board-shaped temperature evening device and fusing glass and relative position of back heating element are adjusted to control temperature of fusing glass temperature.
Description
Technical field:
The invention belongs to the glass manufacturing area of flat-panel display device, the present invention relates to temperature equal device and temperature even method in a kind of glass ware forming that uses when being used for the flat panel display glass substrate manufacturing processed by press over system formed glass substrate.
Background technology:
The display effect of novel flat-panel monitor how, the quality of glass substrate wherein plays important effect, owing to particularly in manufacturing processed, will form many transistors above the middle glass that uses of TFT thin film transistor monitor (TFT-LCD) in the indicating meter and connect all round various schematic circuit of device, control display parameter, this schematic circuit is mostly at micron order, if glass surface has the generation that will cause problems such as short circuit greater than the scuffing of live width or thrust, make and show that level and smooth clean and tidy glass substrate is that indicating meter has one of good display effect condition.As the production technique of high-quality glass substrate, the production method of a kind of being referred to as " press over system " was originally arranged, as described in No. the 3338696th, United States Patent (USP).Press over system be the glass that makes molten state along one have wedge shape section, and downwards two surfaces of convergent formed body flow downward, and be integral at formed body lower end interflow, make then its gradually refrigerative simultaneously, traction downwards forms sheets of glass (as shown in Figure 1).
Gradually in the process of cooling curing, need the viscosity and the thermograde of strict grasp melten glass by molten state at melten glass, what Fig. 8 represented is glass temperature and the relation of viscosity and cooling time.By curve among Fig. 8 as can be seen, melten glass in moulding process, it is very responsive for the variation of temperature reaction, for 1 ℃ temperature variation in this temperature range, the perhaps cooling deviation of 1s, all will cause the variation of molten glass viscosity, thus in the muffle furnace of moulding, temperature control precision will reach ± 0.1 ℃.Cause zonal viscosity change and zonal variation of temperature is very easy, this must influence the inhomogeneous of in the overflow downdraw process flow in the unit area, be easy to make that melten glass produces different thickness and curvature, thereby seriously reduce the quality of sheets of glass.
Existing glass substrate production technique adopts muffle furnace structure shown in Figure 1 usually, adopts press over system to produce sheet glass.And mostly adopt the mode of twining heater strip or simple employing globars radiation heating at the muffle furnace inwall as shown in Figure 1, promote temperature in the stove of muffle furnace, and in order to regulate the viscosity of molten glass.Though this kind mode can make muffle furnace inside reach fast and keep mold temperature, but because the some heat characteristic of globars, its type of heating is outwards to do the covering of the fan radiation by barred body itself, its arrow in the surperficial temperature field that forms of glass plate such as Fig. 1 is represented, certainly lead to the overlapping and staggered of heating region like this, thereby in overflow and under the glass melting liquid level on form the thermograde of palisade, cause melten glass in flooding process, to be subjected to the heating of uneven temperature easily and cause the variation of local temperature, thereby make the partial viscosity of molten glass change and make mass flow discrepancy even, increased the possibility regional in uneven thickness of glass substrate, cause the complicated of control device, and the good article rate that has reduced glass substrate forming reduces the quality of glass substrate, has increased the moulding difficulty.This is very disadvantageous in the scale operation of glass substrate.
When the temperature of molten glass surface changed, traditional technology was very limited for the method for its adjusting, mostly just adopts the adjusting that strengthens or reduce power for certain heating source, strengthens or reduce the temperature of corresponding melten glass.Adopt such control method, if the single amplitude of accommodation is excessive, then easy appropriate melten glass local temperature changes excessive and produces over-control, and easily other portion temperature is produced bigger influence; If the single amplitude of accommodation is too small, then needing wastes the more time, makes the cost of stably manufactured strengthen.How within a short period of time stabilized glass liquid temperature, be related to glass quality and whether stablize.
Summary of the invention:
The present invention has overcome causing the local temperature inequality easily, causing deficiency in uneven thickness, that control device is complicated, the moulding difficulty is big etc. of existing in the prior art, and a kind of glass ware forming quality that significantly improves is provided, reduce temperature equal device and temperature even method in the glass ware forming of operation easier.
The object of the present invention is achieved like this:
Temperature equal device in a kind of glass ware forming comprise melten glass overflow moulding thereon formed body, be arranged on the hot briquetting space of forming by top heating unit and sidewall heating unit of formed body outside and be arranged on the top heating unit and the sidewall heating unit outside insulation portion, be provided with plate-like temperature equal device at the formed body of overflow glass metal and the formed body periphery between the heating unit.
Described plate-like temperature equal device is the high performance silicon carbon plate, and its thermal conductivity at least should be greater than 30w/mk in the time of 1000 ℃.
Described top heating unit and sidewall heating unit are globars, Si-Mo rod heating unit, and the mounting means of adopt lifting, inlaying is evenly distributed in muffle furnace inside.
Top heating unit and sidewall heating unit are distributed on the outside of plate-like temperature equal device.Top heating unit and sidewall heating unit on the described outside that is distributed in plate-like temperature equal device are heater strip, U-shaped heating rod heating unit.The top heating unit on the described outside that is distributed in plate-like temperature equal device and the distribution of sidewall heating unit are even or uneven, and interelement spacing n should be greater than 0.5 times element self spacing m, less than 1.5 times m.
The thickness of plate-like temperature equal device should be between 10～40mm.Temperature equal device is to be full of the complete plate of spatial or to be spliced by little plate.
Temperature even method in a kind of glass ware forming that utilizes temperature equal device, specific as follows:
At first, plate-like temperature equal device is set, and, makes the glass flow liquid be obtained relative uniform temperature with the form heating and melting glass of surface radiation at the formed body of overflow glass metal and the formed body periphery between the heating unit;
Secondly, relative position by the distance between attemperation uniform device and the melten glass and attemperation uniform device and its back heating unit, thereby regulate temperature control to melten glass, reduce the thickness of sheets of glass moulding and the variation of curvature, improve the quality and the good article rate of glass substrate.
When explained hereafter need be regulated the temperature of molten glass surface, the position of lateral adjustments high performance silicon carbon plate, if melten glass needs higher temperature, regulating the high performance silicon carbon plate moves to the formed body direction, make melten glass obtain a large amount of heats, make the temperature fast rise of its integral surface, in the time need regulating the part of melten glass, the relative position of regulating corresponding heating unit and high performance silicon carbon plate changes the dotted line that needs adjusting.
Melten glass of the present invention is in the formed body overflow and moulding, thereby produces the necessary temperature of sheets of glass moulding through the hot briquetting space.And melten glass between the space in, increase temperature-equalizing equipment, its effect is to be radiated the thermal energy collecting of melten glass and with the form heating and melting glass of surface radiation, to make the glass flow liquid be obtained relative uniform temperature.In the temperature red-tape operati, the melten glass of same level has very similar viscosity with guaranteeing, thereby has reduced the thickness of sheets of glass moulding and the variation of curvature.Test shows, uses in the process of this device fabrication sheets of glass, and the temperature variation on the same plane obviously reduces, and the fluctuation at longitudinal temperature also obviously reduces equally, and the taste and the good article rate of sheets of glass promote greatly.
Description of drawings:
Fig. 1 is the muffle furnace structure of original press over system.
Fig. 2 is a structural representation of the present invention.
Fig. 3 is the structure iron by the temperature-uniforming plate of module assembly unit.
The structure iron of the hot-plate that Fig. 4 is entwined for heater strip.
Fig. 5 is the structure iron of the hot-plate of U-shaped heating rod formation.
Fig. 6 is that temperature of glass liquid distributes relatively before and after using this device on certain horizontal plane.
Fig. 7 is that temperature of glass liquid distributes relatively before and after using this device on certain longitudinal surface.
Fig. 8 is a glass in moulding process medium viscosity and temperature, the relation of cooling time.
Embodiment:
As shown in Figure 2, the utility model comprises the formed body 104 of melten glass overflow moulding thereon, be arranged on the hot briquetting space of forming by top heating unit 102 and sidewall heating unit 103 of formed body 104 outsides and be arranged on the top heating unit and the insulation portion 101 of sidewall heating unit outside, between formed body 104 and top heating unit 102 and sidewall heating unit 103, be provided with temperature equal device 105, its effect is to collect the heat energy that is radiated melten glass, and, make the glass flow liquid be obtained relative uniform temperature with the form heating and melting glass of surface radiation; Temperature equal device 105 is that temperature-equalizing equipment 105 is the silicon carbide temperature-uniforming plate, it is enclosed in formed body 104 in the internal space, top heating unit 102, sidewall heating unit 103 are to temperature-equalizing equipment 105 radiant heat source, temperature-equalizing equipment 105 is owing to have quite high thermal conductivity, in the time of 1000 ℃, reach more than the 35w/mk, so the plate face also produces approximately uniform temperature, thereby melten glass is heated as uniform plane heat source, the heat energy that melten glass is subjected to is uniformly, thereby has guaranteed the even of glass metal viscosity.
By regulating the distance between this temperature equal device and the melten glass and regulating this temperature equal device and the relative position of its back heating unit, thereby regulate temperature control to melten glass, reduce the thickness of sheets of glass moulding and the variation of curvature with this, improve the quality and the good article rate of glass substrate.
As shown in Figure 3, temperature equal device 105 can be complete plate, also can be assembled by the little module of a fixed structure.Fig. 3 has provided the structure iron by the silicon carbide temperature-uniforming plate of little module assembly unit.Adopt splicing structure, not only can reach the purpose of samming heating, simultaneously can be so that installation and more convenient to operate feasible.Simultaneously, 105 thickness is chosen between the 10-40mm.Thickness when 105 is thin more, and during promptly near 10mm, it is short more that carborundum plate reaches the reaction times of equal temp effect, but then reduces greatly for the intensity of whole plate, and is difficult for machine-shaping; Thickness when 105 is during greater than 40mm, and its reaction times is sluggish greatly, is difficult to reach the purpose of temperature adjustment samming, and the temperature regulation time prolongs greatly.
Shown in Fig. 4,5,, can adopt the mode of uniform layout globars for heating source.In order to make that 105 can the more uniform thermal source of easier acquisition, heating source can adopt the mode of heating module.Fig. 4,5 has provided the structure of two kinds of heating modules.Fig. 4 slots on fire-resistant plate, twines heater strip.Fig. 5 is setting-in U-shaped heating rod on fire-resistant plate, adopts the mode of both sides intersection lead-in wire, makes that as far as possible the heating part temperature is even.Interelement spacing n should be greater than 0.5 times the element spacing m m less than 1.5 times, preferably m=n.Test shows that when m=n, the Heating temperature that hot-plate produces is the most even, and the temperature curve of acquisition is also the slickest and the most sly.
Fig. 6 has shown that using this device front and back temperature of glass liquid to distribute on the horizontal plane compares.As can be seen, after having used this temperature equalization system, the temperature of the melten glass on the same horizontal plane is tending towards evenly, and fluctuation reduces greatly.When using original shaped device, the transverse gage of formed glass changes sheet glass for 0.7mm-1.5mm about 100um, after adopting equipment of the present invention and method, horizontal variation in thickness is controlled at the mean level (ML) of 30um easily, guaranteed the equilibrium of the viscosity of melten glass on the isoplanar, thereby produce homogeneous thickness more, reduced the risk of sheets of glass curved transition.
Fig. 7 has shown that using this device front and back temperature of glass liquid to distribute on certain longitudinal surface compares.Same, after having used this temperature equalization system, the temperature distribution of melten glass integral body also is tending towards evenly, and temperature transition is slick and sly more, and glass flow liquid overall flow is also more reasonable.Under littler temperature fluctuation, make that sheets of glass itself is more even, the thickness longitudinally of formed glass can be controlled at below the 50um, has reduced operation easier simultaneously.
When melten glass being carried out necessary temperature rising, the adjusting of back heating unit will can directly not influence the quality of melten glass.Suitably regulate the high performance silicon carbon plate and move to the Trough direction, the acquisition more heat that melten glass is more prone at once makes the temperature of its integral surface be climbed to the degree that needs.And because the existence of high performance silicon carbon plate, it is evenly constant that the temperature distribution of its various piece remains, and so just needn't carry out unnecessary re-adjustment to partial temperature spot again, makes to reduce to steady time of technology original 1/3.
In the moulding process of glass substrate, equipment as above forms the key equipment of making glass substrate.When heating unit in muffle furnace or plate heating muffle furnace inner chamber, heating simultaneously places the high performance silicon carbon plate between heating source and the formed body Trough, makes its regional internal heating in correspondence arrive corresponding temperature, and has quite level and smooth temperature curve.When melten glass by the Trough overflow during compacted under, the high performance silicon carbon plate carries out the surface radiation heating for melten glass, its uniform heat radiation surface can obtain similar temperature so that melten glass is same horizontal and vertical.
In the glass ware forming process, in case need the adjusting of temperature, the adjusting of back heating unit will can directly not influence the quality of melten glass.When explained hereafter need be regulated the temperature of molten glass surface, position that can lateral adjustments high performance silicon carbon plate.If melten glass needs higher temperature, can suitably regulate the high performance silicon carbon plate and move to the Trough direction, make melten glass be more prone to obtain a large amount of heats, thus can be so that the temperature fast rise of its integral surface.Because the existence of high performance silicon carbon plate, its uniform heat distribution can be so that the surface temperature of melten glass still keeps distributing relatively uniformly when rising, and needn't carry out unnecessary re-adjustment to partial temperature spot again.In the time need regulating the part of melten glass, the relative position that can regulate corresponding heating unit and high performance silicon carbon plate changes the dotted line that needs adjusting.Same high thermal conductivity owing to the high performance silicon carbon plate, when adjusting local temperature for being adjusted in of corresponding dotted line, its influence for ambient temperature is comparatively level and smooth, is unlikely to cause interior temperature fluctuation on a large scale.Obviously, this regulative mode makes easily that not only regulate process is level and smooth relatively, also makes the adjusting time reduce greatly.
Claims (7)
1. the temperature equal device in the glass ware forming, comprise the formed body that makes melten glass overflow moulding, be arranged on the hot briquetting space of forming by top heating unit and sidewall heating unit of formed body outside and be arranged on the top heating unit and the sidewall heating unit outside insulation portion, it is characterized in that: be provided with plate-like temperature equal device round this formed body periphery between the formed body of melten glass overflow moulding and the heating unit making, described plate-like temperature equal device is the high performance silicon carbon plate, its thermal conductivity at least should be greater than 30W/ (mK) in the time of 1000 ℃, and the thickness of plate-like temperature equal device should be between 10～40mm.
2. the temperature equal device in the glass ware forming as claimed in claim 1, it is characterized in that: described top heating unit and sidewall heating unit are globars or Si-Mo rod heating unit, adopt the mounting means that lifts or inlay to be evenly distributed in muffle furnace inside.
3. the temperature equal device in the glass ware forming as claimed in claim 1 is characterized in that: top heating unit and sidewall heating unit are distributed on the outside of plate-like temperature equal device.
4. the temperature equal device in the glass ware forming as claimed in claim 3 is characterized in that: top heating unit and sidewall heating unit on the described outside that is distributed in plate-like temperature equal device are heater strip or U-shaped heating rod heating unit.
5. the temperature equal device in the glass ware forming as claimed in claim 1 is characterized in that: temperature equal device is to be full of the complete plate of spatial or to be spliced by little plate.
6. the temperature even method in the glass ware forming that utilizes the described temperature equal device of claim 1 is characterized in that:
At first, between the formed body of overflow glass metal and heating unit, plate-like temperature equal device is set, and, makes the glass flow liquid be obtained relative uniform temperature with the form heating and melting glass of surface radiation round this formed body periphery;
Secondly, relative position by the distance between attemperation uniform device and the melten glass and attemperation uniform device and its back heating unit, thereby regulate temperature control to melten glass, reduce the thickness of sheets of glass moulding and the variation of curvature, improve the quality and the good article rate of glass substrate.
7. the temperature even method in the glass ware forming according to claim 6, explained hereafter it is characterized in that: when need be regulated to the temperature of molten glass surface, the position of lateral adjustments high performance silicon carbon plate, if melten glass needs higher temperature, regulating the high performance silicon carbon plate moves to the formed body direction, make melten glass obtain a large amount of heats, make the temperature fast rise of its integral surface, in the time need regulating the part of melten glass, the relative position of regulating corresponding heating unit and high performance silicon carbon plate changes the dotted line that needs adjusting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100538828A CN101012098B (en) | 2007-01-24 | 2007-01-24 | Temperature equality device and temperature equality method in glass forming |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100538828A CN101012098B (en) | 2007-01-24 | 2007-01-24 | Temperature equality device and temperature equality method in glass forming |
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| Publication Number | Publication Date |
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| CN101012098A CN101012098A (en) | 2007-08-08 |
| CN101012098B true CN101012098B (en) | 2010-06-16 |
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| CN2007100538828A Expired - Fee Related CN101012098B (en) | 2007-01-24 | 2007-01-24 | Temperature equality device and temperature equality method in glass forming |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101279814B (en) * | 2008-05-06 | 2010-06-02 | 陕西彩虹电子玻璃有限公司 | Forming appliance for glass base plate of flat liquid crystal display |
| JP5698753B2 (en) * | 2009-10-14 | 2015-04-08 | コーニング インコーポレイテッド | Sheet thickness control method and apparatus |
| JP5685264B2 (en) * | 2009-11-24 | 2015-03-18 | コーニング インコーポレイテッド | Method and apparatus for producing a glass sheet having a controlled thickness |
| US8490432B2 (en) | 2009-11-30 | 2013-07-23 | Corning Incorporated | Method and apparatus for making a glass sheet with controlled heating |
| CN102906036B (en) * | 2010-05-26 | 2015-08-19 | 康宁股份有限公司 | Be used for the equipment of thickness of the flowing band controlling melten glass and method |
| CN102674661A (en) * | 2012-03-31 | 2012-09-19 | 彩虹显示器件股份有限公司 | Temperature control method of glass plate shaping zone of overflow drop-down device |
| CN102765869B (en) * | 2012-07-30 | 2015-07-29 | 彩虹显示器件股份有限公司 | A kind of sheet glass manufacture platinum heating unit |
| JP6489783B2 (en) * | 2014-09-30 | 2019-03-27 | ＡｖａｎＳｔｒａｔｅ株式会社 | Glass substrate manufacturing method and glass substrate manufacturing apparatus |
| CN107531538A (en) | 2015-05-01 | 2018-01-02 | 康宁股份有限公司 | Method and apparatus for controlling glass sheet thickness |
| KR20230029824A (en) * | 2020-06-19 | 2023-03-03 | 코닝 인코포레이티드 | Manufacturing method of glass ribbon |
| CN111646676B (en) * | 2020-07-01 | 2023-09-22 | 彩虹显示器件股份有限公司 | Device and method for controlling substrate glass forming temperature field |
| CN112815721B (en) * | 2021-01-04 | 2023-03-17 | 芜湖东旭光电科技有限公司 | Temperature equalizing plate and shaping furnace with same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3506429A (en) * | 1967-01-03 | 1970-04-14 | Corning Glass Works | Apparatus for improving thickness uniformity in down drawn glass sheet |
| CN1289416C (en) * | 2001-12-21 | 2006-12-13 | 康宁股份有限公司 | Process for producing sheet glass by the overflow downdraw fusion process |
-
2007
- 2007-01-24 CN CN2007100538828A patent/CN101012098B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3506429A (en) * | 1967-01-03 | 1970-04-14 | Corning Glass Works | Apparatus for improving thickness uniformity in down drawn glass sheet |
| CN1289416C (en) * | 2001-12-21 | 2006-12-13 | 康宁股份有限公司 | Process for producing sheet glass by the overflow downdraw fusion process |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2001-31434A 2001.02.06 |
| JP特开平10-167740A 1998.06.23 |
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