WO2008050605A1 - Appareil de production de rubans de verre et procédé de production associé - Google Patents
Appareil de production de rubans de verre et procédé de production associé Download PDFInfo
- Publication number
- WO2008050605A1 WO2008050605A1 PCT/JP2007/069706 JP2007069706W WO2008050605A1 WO 2008050605 A1 WO2008050605 A1 WO 2008050605A1 JP 2007069706 W JP2007069706 W JP 2007069706W WO 2008050605 A1 WO2008050605 A1 WO 2008050605A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- glass ribbon
- glass
- molded body
- reheating
- producing
- Prior art date
Links
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
-
- 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
-
- 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
- C03B17/067—Forming glass sheets combined with thermal conditioning of the sheets
Definitions
- the present invention relates to a glass ribbon manufacturing apparatus and a manufacturing method thereof, and more particularly to improvement of glass ribbon manufacturing technology by a so-called downdraw method in which molten glass is flowed down from a molded body to form a glass ribbon. .
- a so-called downdraw method in which molten glass is allowed to flow down from a molded body to form a glass ribbon that becomes a base plate of the plate glass.
- Examples of such methods include the overflow down draw method (fusion method) and the slot down draw method.
- fusion method molten glass continuously supplied to a shaped body having a wedge-shaped cross-section shape is fused at the lower end of the molded body by flowing down from the top of the molded body along both side surfaces.
- a single plate-like form is formed, and the plate-like glass ribbon in this form is caused to flow down from the lower end portion of the formed body to finally form a solidified glass ribbon.
- the molten glass continuously supplied to the molded body is caused to flow down from a slot-like slit formed at the bottom of the molded body to form a plate shape.
- plate glass is extract
- both end portions in the width direction of a glass ribbon formed by the downdraw method tend to be thicker than the middle portion in the width direction, and the cooling rate due to the difference in plate thickness.
- the ability to take the following countermeasures has been proposed in order to eliminate the problem of distortion occurring in the glass ribbon due to the difference. That is, in a slow cooling furnace that slowly cools the glass ribbon that has flowed down from the molded body, the glass ribbon is spaced a predetermined distance from the surface of the glass ribbon in the middle in the width direction.
- the same document discloses that the glass ribbon is cooled slowly by a heater disposed immediately below the molded body so that the glass ribbon immediately after flowing down from the molded body is not rapidly cooled and contracted in the width direction. Has been.
- Patent Document 1 JP 2001-31435 A
- the glass ribbon formed by the downdraw method is gradually solidified as it flows down from the molded body and moves downward. During this time, the thickness of the glass ribbon is substantially reduced. It can only be done in a limited area just below the green body where the glass ribbon is in the softened state. In other words, the thickness of the glass ribbon that has passed the region does not change substantially even though the glass ribbon may be slightly fluctuated locally when heat treatment such as slow cooling is applied to the glass ribbon. Therefore, once the glass ribbon has been cooled (solidified) to a certain extent, it is no longer possible to reduce the thickness of the glass ribbon, so even if the flow rate of the glass ribbon is increased, the glass ribbon There is a limit to reducing the plate thickness. In particular, it becomes extremely difficult to form a glass ribbon with a thickness of 0.5 mm or less by force and the technique.
- Patent Document 1 discloses that when the glass ribbon is slowly cooled, a heat treatment means is disposed in the intermediate portion in the width direction of the glass ribbon. This is to reduce the cooling rate of the intermediate portion in the width direction of the glass ribbon when it is slowly cooled, so that the thickness of the glass ribbon is not substantially reduced by the slow cooling by this heat treatment means.
- the heater is disposed just below the molded body. The heater, which prevents the glass ribbon from rapidly cooling, suppresses shrinkage in the width direction of the glass ribbon. Therefore, if the thickness of the glass ribbon is substantially reduced even by gradual cooling by this heater!
- a first apparatus which was created to solve the above problems, supplies molten glass to a molded body, and flows the molten glass from the molded body to form a plate-shaped glass ribbon.
- a reheating means is provided on the conveying path of the glass ribbon flowing down from the molded body, and the reheating means is reheated by reheating the glass ribbon.
- the thickness of the glass ribbon is characterized in that it is made thinner than the thickness of the glass ribbon above it.
- the temperature of the ribbon decreases as the glass ribbon flows down.
- the temperature of the glass ribbon is usually controlled by strict control by a temperature control means (heater, etc.) so that the temperature decreases on a scheduled schedule, and the temperature of the glass ribbon does not increase during the flow.
- the glass ribbon is reheated while flowing down so that the thickness of the glass ribbon becomes thinner.
- reheat means that the temperature of the glass ribbon is raised again to lower the viscosity. According to such a manufacturing apparatus, the glass ribbon that has flowed down from the compact is reheated by the reheating means.
- the thickness of the glass ribbon below the thickness of the glass ribbon above the reheating means will be thinner, so the thickness of the glass ribbon should be made thinner. Can do. That is, after reducing the thickness of the glass ribbon to a certain degree directly below the formed body, the thickness of the glass ribbon can be further reduced by the reheating means. Therefore, it is possible to reduce the thickness of the glass ribbon stepwise by dividing it directly below the formed body and directly below the reheating means, so that it is possible to reduce the glass ribbon flow speed unduly. It is possible to suitably reduce the thickness of the ribbon.
- the second device according to the present invention which has been created to solve the above-mentioned problems, supplies molten glass to a molded body and causes molten glass to flow down from the molded body so that a plate-shaped glass lid is formed.
- the glass ribbon manufacturing apparatus for forming a bon is characterized in that reheating means is provided for reheating and softening the glass ribbon that has been cooled down while flowing down from the formed body.
- the temperature of the ribbon decreases as the glass ribbon flows down, and the temperature of the glass ribbon does not increase during the flow down.
- the glass ribbon once cooled is reheated during the flow.
- temporary cooled means that the temperature of the glass ribbon decreases, the viscosity increases, and it becomes difficult to further reduce the plate thickness.
- Heating means that the temperature of the glass ribbon is raised again to lower the viscosity.
- the cooled glass ribbon before being reheated by the reheating means is thinned to a certain degree directly below the formed body. Therefore, it is possible to reduce the thickness of the glass ribbon stepwise by dividing it directly below the molded body and directly below the reheating means, so that the glass that does not unduly increase the flow rate of the glass ribbon can be reduced. It is possible to suitably reduce the thickness of the ribbon.
- a third device which has been created to solve the above-mentioned problems, supplies molten glass to a molded body and causes molten glass to flow down from the molded body to produce a plate-like glass.
- the regulating means is provided directly below the molded body and regulates the shrinkage in the width direction of the glass ribbon. It is characterized by providing reheating means for reheating and softening the glass ribbon whose shrinkage is regulated.
- the temperature of the ribbon decreases as the glass ribbon flows down, and the temperature of the glass ribbon does not increase during the flow down.
- the glass ribbon is reheated immediately below the regulating means.
- “reheating” means increasing the temperature of the glass ribbon again to decrease the viscosity.
- the glass ribbon is often cooled by a regulating means provided directly below the molded body.
- the reheating means provided directly below the regulating means causes the glass ribbon to be cooled.
- the cooled glass ribbon is reheated to a softened state and stretched downward again.
- the restricting means may be a cooling roller that rotates while sandwiching both ends in the width direction of the glass ribbon! /.
- the cooling roller plays a role as a supporting means for supporting the glass ribbon in addition to a role as a regulating means for regulating the shrinkage in the width direction of the glass ribbon. Stabilization of the ribbon forming process can be suitably achieved.
- the reheating means is configured to reheat the glass ribbon over the entire width of the glass ribbon! /.
- the glass ribbon can be thinned more suitably because the reheating means can apply the force S to soften the glass ribbon over its entire width.
- the reheating means is preferably configured so that the heating temperature can be adjusted along the width direction of the glass ribbon. In this way, the force to adjust the softened state of the glass ribbon over the entire width S can be achieved, so the amount of displacement in the flow direction (vertical direction) of the glass ribbon due to reheating. Can be constant over the entire width of the glass ribbon.
- a gap having a dimension larger than the thickness of the glass ribbon is provided in the thickness direction of the glass ribbon below the reheating means, and the warp or displacement of the glass ribbon is within the gap. It is preferable to provide guide means for regulating and guiding the above.
- the thinner the ribbon of the glass ribbon the more likely the glass ribbon is warped and displaced (for example, shaking).
- the gap between the guide means causes the glass ribbon to be warped in a state in which warpage or displacement is regulated, or the like. It is possible to prevent a situation where the material is solidified with deformation.
- the guide means is configured to guide only both ends in the width direction of the glass ribbon!
- a plate glass as a product is usually collected from an intermediate portion in the width direction while cutting both ends in the width direction as ears. Therefore, in this way, since only the both ends in the width direction of the glass ribbon to be cut out as the ears are guided, the entire glass ribbon without hindering the surface quality of the intermediate portion in the width direction where the plate glass is collected. It is possible to suppress warping and displacement.
- the guide means is constituted by a guide roller that rotates in a state of being opposed to each of both end portions in the width direction of the glass ribbon via a gap having a dimension larger than the thickness of the glass ribbon. Being les, it's preferable to be les.
- a first method according to the present invention created to solve the above problems is to supply molten glass to a molded body, and form molten glass from the molded body to form a plate-shaped glass ribbon.
- the glass ribbon manufacturing method includes a reheating step of reheating the glass ribbon flowing down from the molded body, and the glass ribbon is reheated in the reheating step, so that The thickness of the glass ribbon is greater than the thickness of the glass ribbon before heating. Characterized by thinning.
- the second method according to the present invention which was created to solve the above-described problems, supplies molten glass to a molded body, and also causes molten glass to flow down from the molded body to cause a plate-like glass assembly.
- the method for producing a glass ribbon for forming a Bonn is characterized in that it includes a reheating step of reheating and softening the glass ribbon that has been cooled down while flowing down from the molded body.
- the third method according to the present invention which has been created to solve the above-described problems, is to supply molten glass to a molded body and flow down the molten glass from the molded body to produce a plate-like glass.
- the shrinkage in the width direction is regulated in the regulation step. It is characterized by including a reheating step in which the glass ribbon is reheated and softened.
- the reheating of the glass ribbon in the reheating step is preferably performed at a temperature equal to or higher than the softening point of the glass ribbon.
- a temperature equal to or higher than the softening point of the glass ribbon.
- the thickness of the intermediate portion in the width direction of the glass ribbon after molding is not more than 1/2 of the thickness of the intermediate portion in the width direction of the glass ribbon before the reheating step.
- the “glass ribbon after molding” means a glass ribbon that has been sufficiently cooled and solidified to the extent that the wall thickness does not decrease even if it is drawn downward (hereinafter the same).
- the thickness of the intermediate portion in the width direction of the glass ribbon after forming is preferably 0.5 mm or less, and more preferably 0.2 mm or less.
- a cover glass for a solid-state imaging device such as a CCD or CMOS
- a glass substrate for various flat panel displays typified by a liquid crystal display, and the like.
- An extremely thin plate glass as required in recent years can be properly manufactured.
- the glass ribbon reheated in the reheating step is passed through a gap provided in the guide means so as to have a dimension larger than the plate thickness, It is preferable to further include a guide step for guiding the glass ribbon to be warped or displaced within the gap.
- the thickness can be further reduced.
- the glass ribbon thickness can be reduced step by step immediately below the glass ribbon and immediately after the glass ribbon is reheated, so that the glass ribbon thickness does not unduly increase the flow rate of the glass ribbon. Can be suitably reduced in thickness.
- FIG. 1 is a schematic longitudinal sectional side view showing a glass ribbon manufacturing apparatus according to an embodiment of the present invention.
- FIG. 2 is a schematic longitudinal front view of the manufacturing apparatus.
- FIG. 1 is a schematic longitudinal side view schematically showing the internal state of a glass ribbon manufacturing apparatus according to an embodiment of the present invention
- FIG. 2 is a schematic vertical view schematically showing the internal state of the manufacturing apparatus.
- this manufacturing apparatus 1 includes a molded body 3, a regulating means 4, a reheating means 5, and a guide means 6 in order from the top in a furnace 2 made of refractory bricks. I have.
- the molded body 3 has a wedge-shaped cross section and has an overflow groove 3a at the top.
- the overflowing molten glass Y flows down along both side surfaces 3b of the molded body 3 and is fused at the lower end 3c of the molded body 3 to form a plate shape.
- the molten glass Y in this form is formed into a plate shape.
- the glass ribbon G flows down in the vertical direction.
- the regulating means 4 regulates the thermal contraction in the width direction of the glass ribbon G directly below the molded body 3, the molten glass Y flows down from the top of the molded body 3 along both side surfaces 3b. It is constituted by a cooling roller (edge roller) 4a disposed so as to sandwich the glass ribbon G immediately after forming a single plate by fusing at the lower end 3c of the molded body 3. More specifically, a total of four cooling rollers 4a are arranged at each end in the width direction of the glass ribbon G, and the glass ribbon G is sandwiched between both ends in the width direction while sandwiching only the both ends in the width direction of the glass ribbon G. It is designed to rotate at a rotational speed synchronized with the flow speed of G.
- the reheating means 5 reheats and softens the glass ribbon G that has been cooled while flowing down from the molded body 3, and the glass ribbon G faces the front and back surfaces of the glass ribbon G through a space, respectively.
- the heater 5a is arranged so as to do so. More specifically, as shown in FIG. 2, the heater 5a is longer than the width of the glass ribbon G, and reheats and softens the glass ribbon G over the entire width of the glass ribbon G. It is summer. Although not shown, the heater 5a is divided into a plurality of pieces along the width direction of the glass ribbon G, and the heating temperature is adjusted in the width direction so that the softened state of the glass ribbon G is substantially equal in the width direction. It can be controlled individually.
- the glass ribbon G reheated by the heater 5a in the width direction is also directly below the heater 5a.
- a cooling roller 4b is provided as a restricting means for restricting heat shrinkage.
- the cooling roller 4b has the same configuration as the cooling roller 4a described above, and rotates while sandwiching both end portions in the width direction of the reheated glass ribbon G.
- the guide means 6 has a gap having a dimension larger than the thickness of the glass ribbon G in the thickness direction of the glass ribbon G, and guides the glass ribbon G by regulating warpage or displacement within the gap.
- the guide means 6 may be configured by a plate-like member that is opposed and spaced apart by a gap having a dimension larger than the thickness of the glass ribbon G.
- the width of the glass ribbon G The thickness of the glass ribbon G (both ends in the width direction) It is composed of a guide roller 6a that rotates in a state of being opposed to each other through a gap having a larger dimension than the thickness of the plate.
- the facing distance ⁇ of the guide aperture rollers 6a facing in the thickness direction of the glass ribbon G is preferably set to 10 mm or less, particularly 5 mm or less.
- the lower limit of the facing distance ⁇ is appropriately adjusted according to the thickness of both ends of the glass ribbon G in the width direction, and is preferably 0.2 mm or more, particularly preferably 1 mm or more. Good.
- a total of four guide rollers 6a arranged in pairs at each end in the width direction of the glass ribbon G in this way, when viewed in the direction of transport of the glass ribbon G, is one or more on the transport path. It is arranged in multiple places (three places in the vertical direction in the figure). Each guide roller 6a rotates at a rotation speed corresponding to the flow speed of the glass ribbon G.
- the lowermost guide roller 6a holds the glass ribbon G by reducing the facing interval ⁇ as necessary.
- it may be used as a pulling roller that is pulled downward.
- glass ribbon G is manufactured as follows.
- the glass ribbon G immediately after flowing down from the lower end portion 3c of the molded body 3 is stretched downward while being restricted in contraction in the width direction by the cooling roller 4a (hereinafter referred to as initial thickness). Until it gets thinner. That is, the glass ribbon G is cooled by the cooling roller 4a and the atmosphere in the furnace 2 and approaches the solidified state, and no substantial variation in the plate thickness occurs at the stage where the initial thickness is reached.
- the glass ribbon G that has been once cooled and has reached the initial thickness is softened by being reheated by the heater 5a.
- the glass ribbon G force once cooled is stretched downward again, and becomes thinner than the plate thickness force S of the glass ribbon G, the initial thickness.
- the thickness of the intermediate portion in the width direction of the glass ribbon G reheated by the heater 5a finally becomes, for example, 1/2 or less of the initial thickness of the intermediate portion in the width direction.
- the thickness of the glass ribbon G is reduced stepwise by dividing the thickness of the glass ribbon directly below the molded body 3 and directly below the heater 5a. Without increasing the speed, the thickness of the glass ribbon G can be suitably reduced.
- the reheating by the heater 5a is performed at a temperature higher than the softening point of the glass ribbon G (for example, 1000 to 1300 ° C). It is performed over the entire width of the glass ribbon G, and the heating temperature is adjusted in the width direction so that the softened state of the glass ribbon G in the width direction is uniform. Therefore, since it becomes difficult for the amount of displacement in the transport direction of the glass ribbon G to vary due to reheating by the heater 5a, it is possible to accurately reduce the thickness of the glass ribbon G.
- the glass ribbon G having a plate thickness of 0.5 mm or less, and further a plate thickness of 0.2 mm or less can be easily manufactured.
- the extremely thin glass ribbon G can be suitably used as a cover glass for a solid-state imaging device such as a CCD or CMOS, or a glass substrate for various flat panel displays typified by a liquid crystal display. it can.
- the glass ribbon G whose thickness is reduced by reheating by the heater 5a is a guide roller 6a disposed opposite to the glass ribbon G through a gap having a dimension larger than the thickness at both ends of the glass ribbon G in the width direction. Guided downward through the gap between them.
- the thinner the glass ribbon G is the more likely it is to warp the glass ribbon G flowing down from the lower end 3c of the molded body 3 or to cause displacement due to shaking, etc.
- By passing through the gap of 6a it is guided while warpage and displacement are regulated within the gap.
- each guide roller 6a rotates at a rotational speed corresponding to the flow speed of the glass ribbon G. Therefore, even when the glass ribbon G contacts the guide roller 6a, the glass ribbon G moves downward. It will be guided smoothly.
- the cooling rollers 4a and 4b as regulating means directly below the molded body 3 and directly below the heater 5a, the reduction in the width dimension of the glass ribbon G can be regulated. Therefore, it is possible to reduce the thickness of the glass ribbon G while ensuring a large width-direction dimension of the intermediate portion in the width direction of the glass ribbon G from which the plate glass is collected.
- the force for explaining the reheating means arranged at one place on the conveyance path of the glass ribbon is a restricting means arranged immediately below the molded body. Multiple reheating means may be arranged on the glass ribbon transport path leading to the guide means with a space in the vertical direction! /.
- the present invention is applied to the glass ribbon formed by the overflow down draw method.
- the present invention is similarly applied to a glass ribbon formed by the slot down draw method, for example. Can be applied.
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/311,626 US20090314032A1 (en) | 2006-10-24 | 2007-10-09 | Glass ribbon producing apparatus and process for producing the same |
EP07829444.4A EP2077254B1 (en) | 2006-10-24 | 2007-10-09 | Glass ribbon producing apparatus and process for producing the same |
CN200780039588XA CN101528617B (zh) | 2006-10-24 | 2007-10-09 | 玻璃带的制造装置及其制造方法 |
KR1020097001392A KR101420195B1 (ko) | 2006-10-24 | 2007-10-09 | 유리 리본의 제조 장치 및 그 제조 방법 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006-289117 | 2006-10-24 | ||
JP2006289117 | 2006-10-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008050605A1 true WO2008050605A1 (fr) | 2008-05-02 |
Family
ID=39324410
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/069706 WO2008050605A1 (fr) | 2006-10-24 | 2007-10-09 | Appareil de production de rubans de verre et procédé de production associé |
Country Status (6)
Country | Link |
---|---|
US (1) | US20090314032A1 (ja) |
EP (2) | EP2077254B1 (ja) |
KR (1) | KR101420195B1 (ja) |
CN (1) | CN101528617B (ja) |
TW (1) | TWI387565B (ja) |
WO (1) | WO2008050605A1 (ja) |
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- 2007-10-09 EP EP10188400A patent/EP2277835A1/en not_active Withdrawn
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US20110177290A1 (en) * | 2008-10-01 | 2011-07-21 | Masahiro Tomamoto | Glass roll, device for producing glass roll, and process for producing glass roll |
US8241751B2 (en) | 2008-10-01 | 2012-08-14 | Nippon Electric Glass Co., Ltd. | Glass roll and process for producing glass roll |
US8806894B2 (en) | 2008-10-01 | 2014-08-19 | Nippon Electric Glass Co., Ltd. | Process for producing glass roll with a separable protective sheet |
US10562727B2 (en) | 2008-10-01 | 2020-02-18 | Nippon Electric Glass Co., Ltd. | Glass roll and method of processing glass roll |
US10781036B2 (en) | 2008-10-01 | 2020-09-22 | Nippon Electric Glass Co., Ltd. | Glass roll with a separable protective sheet |
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KR101780812B1 (ko) * | 2009-06-17 | 2017-09-21 | 코닝 인코포레이티드 | 글래스 리본의 만곡 콘트롤 |
US9517961B2 (en) | 2009-07-30 | 2016-12-13 | Nippon Electric Glass Co., Ltd. | Glass ribbon and method for producing the same |
WO2011077756A1 (ja) * | 2009-12-24 | 2011-06-30 | AvanStrate株式会社 | ガラス板およびガラス板の製造方法 |
WO2011077734A1 (ja) * | 2009-12-24 | 2011-06-30 | AvanStrate株式会社 | ガラス板製造方法およびガラス板製造装置 |
JP5186602B2 (ja) * | 2009-12-24 | 2013-04-17 | AvanStrate株式会社 | ガラス板製造方法およびガラス板製造装置 |
KR101346930B1 (ko) | 2009-12-24 | 2014-01-03 | 아반스트레이트 가부시키가이샤 | 유리판 및 유리판의 제조 방법 |
Also Published As
Publication number | Publication date |
---|---|
EP2277835A1 (en) | 2011-01-26 |
EP2077254A1 (en) | 2009-07-08 |
CN101528617A (zh) | 2009-09-09 |
EP2077254B1 (en) | 2013-06-05 |
KR20090082337A (ko) | 2009-07-30 |
TWI387565B (zh) | 2013-03-01 |
TW200829523A (en) | 2008-07-16 |
EP2077254A4 (en) | 2010-04-07 |
KR101420195B1 (ko) | 2014-07-17 |
CN101528617B (zh) | 2012-06-13 |
US20090314032A1 (en) | 2009-12-24 |
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