CN1169737C - Sheet glass manufacturing apparatus - Google Patents
Sheet glass manufacturing apparatus Download PDFInfo
- Publication number
- CN1169737C CN1169737C CNB021249687A CN02124968A CN1169737C CN 1169737 C CN1169737 C CN 1169737C CN B021249687 A CNB021249687 A CN B021249687A CN 02124968 A CN02124968 A CN 02124968A CN 1169737 C CN1169737 C CN 1169737C
- Authority
- CN
- China
- Prior art keywords
- glass
- lower edge
- temperature
- edge portion
- sheet glass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Abstract
The invention provides an apparatus, such as non alkaline glass applied to sheet glass for a display substrate of a liquid crystal display, having a high devitrification temperature. A cooling member 8 is disposed at a heating source 6 of side end members 2 and the downflow glass temperature of an inner layer verging on the heating source 6 is kept at the devitrification temperature of this glass or above and the outside surface temperature of the downflow glass is kept below the devitrification temperature of the glass.
Description
[0001]
Technical field
The present invention is the production unit of relevant sheet glass, particularly a kind of sheet glass manufacturing apparatus of producing high recrystallization temperature.
[0002]
Background technology
As the prime sheet glass producing process, the production method of a kind of being referred to as " overflow fusion method " was arranged originally.
[0003]
The overflow fusion method be make fused glass along one have wedge shape section, and downwards convergent molding two surfaces flow downward, and under the lower edge portion of molding, collaborate to be integral, make then its gradually refrigerative simultaneously, traction downwards forms sheet glass.
[0004]
In this manufacturing process, glass in case moulding process is just finished at the interflow immediately, just can not allow its distortion after for this reason again under the molding lower edge portion of wedge shape section.Near the viscosity of the glass the molding lower edge portion of wedge shape section is too high or too low, all is difficult to obtain high-quality sheet glass.For this reason, during with traditional overflow fusion method moulding, will the viscosity controller of the lower edge portion melten glass of molding be made in 30000-1000000 pool scope.
[0005]
When adopting the moulding of overflow fusion method, because near the viscosity of the glass metal the molding lower edge portion of wedge shape section is restricted, the viscosity of corresponding devitrification of glass be restricted the viscosity of devitrification of glass temperature (promptly corresponding to).In other words, if the initial viscosity of devitrification of glass lower (being the recrystallization temperature height) is 30000 pools or the glass when lower as the viscosity corresponding to recrystallization temperature so, crystallization just can't moulding basically.
[0006]
Thereby the body material that is used for flat-panel monitor or carrier is to belong to the special glass with higher recrystallization temperature, thereby uses the production unit of original overflow fusion method will moulding.
[0007]
Summary of the invention
The objective of the invention is to alleviate significantly of the restriction of original technology, the restriction that promptly so-called easy crystallization glass can not moulding to glass; A kind of sheet glass manufacturing apparatus of moulding of the contour recrystallization temperature glass of substrate glass that is suitable for flat-panel monitor or carrier is provided.
[0008]
To achieve these goals, the present invention has adopted a kind of sheet glass manufacturing apparatus with following structure, molding is made up of body and side member, body has convergent cross-sectional shape downwards, lower edge portion at convergent body, to the melten glass interflow under two surface currents be integral, and formation sheet glass, dispose the side member of the width of feed glass plate in the both sides of this body, be characterized in thermal source being set, so that contact with lower edge portion and the internal surface temperature of the melten glass that flows downward remains on the recrystallization temperature that is higher than this glass in the lower edge portion of said body; Simultaneously, remove to cool off the melten glass outside surface that flows downward, make the glass appearance surface surface temperature that flows downward remain on this glass viscosity be that 30000-1000000 moors on the pairing temperature; The outside surface of the melten glass of the body lower edge of flowing through under subtend portion carries out the refrigerative refrigerating unit near this glass outer surface.
[0009]
When the temperature of glass is higher than the liquidus temperature that is determined by glass formula, can not produce crystallization basically.Crystallization forms seldom immediately, needs the time of several minutes or several days to produce usually.In addition, with respect to the inside of glass, crystallization is easy to forming with the contacted interface of external substance.Therefore, in using overflow fusion method production unit, on the contacted surface of the molding with wedge shape section, because melten glass flow velocity herein causes long meeting of residence time to be easy to produce crystallization the most slowly.In other words, when using overflow fusion method production unit to produce high recrystallization temperature glass, the surface temperature that requires to have the molding of wedge shape section must be higher than its recrystallization temperature in its whole zone.On the other hand, for making glass collaborate thirty years of age under the lower edge portion of the molding with wedge shape section is moulding, simultaneously can not produce follow-up distortion, viscosity at the melten glass of the lower edge portion of molding requires to remain on suitable numerical value, and generally speaking suitable glass viscosity is the 30000-1000000 pool.Pairing viscosity in its all zones is moored or when lower 30000 although the inventor finds surface temperature when the molding of wedge shape section, if having near the hull-skin temperature of lower edge portion of wedge shape section body can be controlled at corresponding to the low temperature of viscosity at the 30000-1000000 pool, glass can be under wedge shape molding lower edge portion and finish moulding immediately so, also can prevent to produce simultaneously follow-up distortion.In addition, just it is enough as long as form in the long zone of the lower edge position 50mm with wedge-shaped body if also find this temperature field.
[0010]
Based on these discoveries, according to claim 1, characteristics of the present invention are that molding lower edge portion is provided with thermal source, internal layer temperature with lower edge portion contacted mobile glass metal to be remained on be higher than the devitrification of glass temperature, simultaneously by the cooling of the glass outer surface that flows, make the temperature of the glass outer surface that flows remain on temperature corresponding to the viscosity 30000-1000000 pool of glass.Consider thermally equilibrated problem with regard to needs in view of the above, because the exospheric temperature of glass will reach the thermosteresis that temperature produced that institute moors corresponding to viscosity 30000-1000000 through cooling, be compensated by the thermal source that is arranged on molding, its result forms certain thermograde at the thickness direction of the glass of institute's moulding.So, remain on the temperature that can not form crystallization by the glass temperature of transference molding surface contact, although viscosity reduces so, also can form a kind of high viscosity state, and under the glass appearance surface surface temperature corresponding to this viscosity, can produce crystallization usually.Outside the outside surface deacration of glass, not with situation that any object contacts under, at utmost point short period of time internal cooling to the temperature of solidifying.So it is not just plastic under the situation of crystallization on its surface.Therefore,, have the special glass of higher recrystallization temperature so as matrix of flat-panel monitor or carrier etc., also can under the prerequisite that does not influence quality, be easy to moulding if utilize production unit of the present invention.
[0011]
According to claim 2 of the present invention, said thermal source is made of the conducting metal that is placed on body lower edge portion.Its lower edge portion heats by applying electric current to conducting metal.So body lower edge portion can heat by thermal source simple in structure.
[0012]
According to claim 3 of the present invention, the glass that flows downward to the contact of body lower edge portion, force cooling at its glass outer surface that flows downward by cooling way, make the hull-skin temperature of the glass that flows down reduce to the low temperature of mooring corresponding to viscosity 30000-1000000.Therefore, it can be remained on more than recrystallization temperature, thereby the glass ware forming of high recrystallization temperature can be under the situation of crystallization not, made in the internal layer temperature of the glass that contacts with body surface.
[0013]
According to claim 4 of the present invention, platinum or platinum alloy are as conducting metal, so thermal source can be heated to 1300 ℃ or higher.So this equipment can be used for the easy crystallization glass that recrystallization temperature surpasses 1300 ℃.
[0014]
According to claim 5 of the present invention, the characteristics of this equipment are the moulding that is suitable for high recrystallization temperature glass, and the viscosity corresponding with its temperature is the 3000-30000 pool.Certainly, production unit of the present invention also is applicable to the glass of low recrystallization temperature.Yet, because this equipment of characteristics of 1-4 item claim of the present invention is specially adapted to produce the glass with high recrystallization temperature.
[0015]
Description of drawings
Below in conjunction with accompanying drawing sheet glass manufacturing apparatus of the present invention is described in detail.
[0016]
Fig. 1 is a kind of front view that the present invention produces sheet glass equipment.
Fig. 2 is the sectional view of a kind of edge " A-A " line of production unit molding among Fig. 1.
Embodiment
[0017]
As shown in the figure, molding is made up of following part: have wedge shape section and downward convergent body 1; The both sides of body 1 are provided for regulating the lateral members 2,2 of width of glass sheet; Be arranged on the intake 3 of the melten glass on the lateral members 2.Although omit in the drawings, this intake 3 links to each other with the melting furnaces that the clarification melten glass is housed, and will melt in melten glass is transported to body 1 from melting furnaces the concave part 5.
[0018]
In Fig. 1, melten glass is transported to concave part 5, and flows to the right side along concave part 5 from the left side, meanwhile from upper limb 4 overflows.The melten glass G of institute's overflow flows down along two surfaces 9 of body 1, as shown in Figure 2, and at lower edge portion integrator, forms sheet glass GR.Sheet glass GR is moved downward sheet glass GR traction downwards by the roller-way (not shown), and then reach the purpose that makes sheet glass GR be shaped to sheet glass.
[0019]
Body 1 is made by refractory materials such as aluminum oxide, zirconium white or materials similar.
[0020]
Lower edge portion at body 1 is provided with thermal source 6 along lower edge portion.This thermal source 6 is made by conducting metal platinum or its alloy, and is connected with the power supply (not shown).When power supply heat source 6 applied electric current, thermal source 6 will produce heat, and its temperature can rise to 1300 ℃ or higher.Therefore, can remain on the temperature identical with thermal source 6 contacted interior surfaces of glass temperature with thermal source 6.
[0021]
In addition, in the lower edge portion both sides of body 1, the refrigerating unit 8 of cylindrical or prismatic is set at regular intervals.The length of these refrigerating units 8 is longer than the total length of lower edge portion, so that the outside surface of the sheet glass G by lower edge portion can evenly be cooled off.In addition, the supply line (not shown) of refrigerant is connected to refrigerating unit 8, and refrigerant (gas or liquid) will obtain supply from the coolant supply (not shown) by the refrigerant supply line.Therefore, refrigerating unit 8 is cooled to required temperature, will remove to cool off the outside surface by the sheet glass G of lower edge portion simultaneously.The cooling power of refrigerating unit 8 is easy to regulate by the distance that changes refrigerating unit and glass surface.
[0022]
When the glass (the pairing range of viscosities of the recrystallization temperature of glass is moored at 3000-30000) of high recrystallization temperature when having the sheet glass equipment moulding of said structure, energising heating is arranged on the thermal source 6 of the lower edge portion of molding 1, and the temperature with the internal surface of thermal source 6 contacted sheet glass G is remained on more than the recrystallization temperature of this kind glass.Simultaneously, remove to cool off the outside surface of the sheet glass G that contacts with the lower edge portion of molding 1 by refrigerating unit 8.The viscosity of the outside surface of sheet glass G can be regulated in the scope of 30000-1000000 pool.Therefore, have higher recrystallization temperature although be used for the substrate glass of flat-panel monitor or information recording medium, also can moulding, and without any crystallization; And then can produce the sheet glass of desired surface quality.
[0023]
In addition, in above-mentioned production unit, constitute thermal source 6 with conducting metal, heat lower edge portion by apply electric current to conducting metal in the lower edge portion of molding body 1.Therefore, the lower edge portion of body 1 can heat by the thermal source 6 with easy structure.
[0024]
In addition, in production unit, use platinum or platinum alloy as conducting metal, so thermal source can be heated to 1300 ℃ or higher.So this production unit also can be adapted to the high recrystallization temperature glass up to 1300 ℃.
[0025]
The effect of invention
As mentioned above, according to sheet glass manufacturing apparatus of the present invention, establish in the lower edge section of formed body Put thermal source, will remain on the internal layer temperature of the glass that flows downward that contacts with lower edge section and be higher than glass Recrystallization temperature on. The outer surface of the glass that flows downward simultaneously, remains on and is suitable for the overflow fusion process Temperature corresponding to 30000-1000000 pool viscosity. Although so flat-panel monitor or information recording medium Substrate glass have high recrystallization temperature, but in the situation that does not affect quality, can become at an easy rate Type.
[0026]
In addition, according to the present invention, thermal source is by the conducting metal institute that is arranged on formed body body lower edge section Consist of, and heat lower edge section by applying electric current to this conducting metal. Therefore, formed body is lower End margin section can heat by the thermal source with easy structure.
[0027]
And, according to the present invention, because of with platinum or platinum alloy as conducting metal, so its thermal source can To be heated to 1300 ℃ or higher. Although so the glass of producing has 1300 ℃ high recrystallization temperature, Also well moulding.
Illustrated brief description
Fig. 1
Sheet glass manufacturing apparatus front view of the present invention.
Fig. 2
The formed body sectional view of production equipment shown in Figure 1.
The explanation of symbol
1... molding body
2... lateral members,
3... intake,
4... upper limb,
5... concave part,
6... thermal source,
8... refrigerating unit,
9... body surface
Claims (4)
1, a kind of sheet glass manufacturing apparatus, its molding is made up of body and side member, body has convergent cross-sectional shape downwards, in convergent lower edge portion, it will make the melten glass interflow under two surface currents be integral, and formation sheet glass, the side member of the width of feed glass plate is set on two sides of body, it is characterized in that thermal source being set, make the internal layer temperature of the melten glass that contacts with lower edge portion and flow downward remain on the recrystallization temperature that is higher than this glass in the lower edge portion of said body; Simultaneously, remove to cool off the melten glass outside surface that flows downward, make the glass appearance surface surface temperature that flows downward remain on this glass viscosity be that 30000-1000000 moors on the pairing temperature; The outside surface of the melten glass of the body lower edge of flowing through under subtend portion carries out the refrigerative refrigerating unit near this glass outer surface.
2, sheet glass manufacturing apparatus according to claim 1 is characterized in that thermal source is made up of the conducting metal that is positioned at body lower edge portion, heats lower edge portion by switching on to conducting metal.
3, sheet glass manufacturing apparatus according to claim 2 is characterized in that conducting metal is platinum or platinum alloy body.
4,, it is characterized in that the recrystallization temperature of the glass of producing is the 3000-30000 pool corresponding to glass viscosity according to any one the described sheet glass manufacturing apparatus in claim 1 or 2 or 3.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001197829 | 2001-06-29 | ||
| JP197829/2001 | 2001-06-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1406898A CN1406898A (en) | 2003-04-02 |
| CN1169737C true CN1169737C (en) | 2004-10-06 |
Family
ID=19035369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021249687A Expired - Fee Related CN1169737C (en) | 2001-06-29 | 2002-06-28 | Sheet glass manufacturing apparatus |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1169737C (en) |
| DE (1) | DE10229344B4 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108996895A (en) * | 2018-08-01 | 2018-12-14 | 彩虹显示器件股份有限公司 | A kind of glass substrate overflow molding crystallization control device |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050268657A1 (en) * | 2004-06-02 | 2005-12-08 | Adamowicz John A | Isopipe mass distribution for forming glass substrates |
| US20050268659A1 (en) * | 2004-06-02 | 2005-12-08 | Rhoads Randy L | Defect reduction in manufacture glass sheets by fusion process |
| JP4711171B2 (en) * | 2004-12-28 | 2011-06-29 | 日本電気硝子株式会社 | Sheet glass manufacturing apparatus and sheet glass manufacturing method |
| US8397538B2 (en) * | 2009-02-26 | 2013-03-19 | Corning Incorporated | Apparatus and method for drawing a ribbon of glass |
| KR101196574B1 (en) * | 2010-09-30 | 2012-11-01 | 아반스트레이트 가부시키가이샤 | Glass sheet manufacturing method |
| WO2014030649A1 (en) * | 2012-08-24 | 2014-02-27 | 日本電気硝子株式会社 | Device for manufacturing sheet glass, and method for manufacturing sheet glass |
| US9512025B2 (en) * | 2014-05-15 | 2016-12-06 | Corning Incorporated | Methods and apparatuses for reducing heat loss from edge directors |
| CN107108306B (en) | 2014-09-30 | 2020-07-07 | 康宁股份有限公司 | Isopipe having a trim at the compression end and method for forming a glass ribbon |
| KR20180100018A (en) | 2017-02-28 | 2018-09-06 | 코닝 인코포레이티드 | Apparatus for cleaning edge director and method of cleaning edge director |
| CN107445458B (en) * | 2017-07-27 | 2020-05-12 | 彩虹（合肥）液晶玻璃有限公司 | Heating device for drainage plate in muffle furnace and control method thereof |
-
2002
- 2002-06-26 DE DE2002129344 patent/DE10229344B4/en not_active Expired - Fee Related
- 2002-06-28 CN CNB021249687A patent/CN1169737C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108996895A (en) * | 2018-08-01 | 2018-12-14 | 彩虹显示器件股份有限公司 | A kind of glass substrate overflow molding crystallization control device |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10229344A1 (en) | 2004-02-12 |
| CN1406898A (en) | 2003-04-02 |
| DE10229344B4 (en) | 2011-02-17 |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20041006 |