WO2014163063A1 - 板ガラスの成形方法、及び板ガラスの成形装置 - Google Patents
板ガラスの成形方法、及び板ガラスの成形装置 Download PDFInfo
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- WO2014163063A1 WO2014163063A1 PCT/JP2014/059609 JP2014059609W WO2014163063A1 WO 2014163063 A1 WO2014163063 A1 WO 2014163063A1 JP 2014059609 W JP2014059609 W JP 2014059609W WO 2014163063 A1 WO2014163063 A1 WO 2014163063A1
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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
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- the present invention relates to a sheet glass forming method using an overflow downdraw method and a sheet glass forming apparatus.
- plate glass products represented by glass substrates for flat panel displays such as liquid crystal displays, plasma displays, and organic EL displays are required to have strict quality against surface defects and waviness. Therefore, as a method for producing this type of plate glass product, an overflow down draw method that can obtain a glass surface that is smooth and has few defects is often employed.
- Patent Document 1 An example of this overflow downdraw method is disclosed in Patent Document 1 below.
- a pair of guides regulate the spread in the width direction of the molten glass overflowing on both sides from the supply groove formed on the top of the molded body along the inclined surface portion forming the wedge shape of the molded body.
- An embodiment is disclosed in which a sheet glass is formed by flowing down and fusing and integrating at the lower end of the molded body.
- the flow of the molten glass flowing down the inclined surface portion of the formed body tends to be unstable. More specifically, the molten glass that is flowing is caused to flow away from the guide and approach the center in the width direction in the vicinity of the guide due to the influence of gravity and the surface tension of the molten glass.
- the thickness of the molten glass flowing down the inclined surface portion of the molded body is prevented from becoming uneven in the width direction when the glass sheet is formed by the overflow down draw method,
- a technical problem is to improve the smoothness of the surface of a plate glass formed from glass.
- the method according to the present invention which was created to solve the above-mentioned problems, is the molten glass overflowing on both sides from the supply groove formed on the top of the molded body, along the inclined surface portion forming the wedge shape of the molded body,
- the projecting dimension of the guide from the inclined surface part is H
- the ratio H / T is characterized by being set to 0.8 to 1.5.
- the ratio H / T is preferably set to 1.1 to 1.3.
- the protruding dimension H is gradually increased along the direction in which the molten glass flows down the inclined surface portion.
- the protrusion dimension H is gradually increased along the direction in which the molten glass flows down the inclined surface portion, it is advantageous in optimizing the force for preventing the separated flow. Moreover, since it leads also to optimizing the protrusion dimension H, for example, it is not necessary to unduly use an excessive material for a guide made of a material containing a platinum group element such as platinum or rhodium. It is also suitable for reducing the material cost.
- the apparatus according to the present invention which was created to solve the above problems, spreads the molten glass overflowing from both sides of the supply groove formed on the top portion in the width direction along the wedge-shaped inclined surface portion.
- a sheet glass forming apparatus comprising a molded body that forms a sheet glass by fusing and lowering with a pair of guides, and forming a sheet glass by fusing and integrating at the lower end portion
- the protrusion dimension of the guide from the inclined surface portion is H
- the ratio H / T is set such that the value of H is set to 0.8 to 1.5.
- the projecting dimension from the inclined surface portion of the guide is H, and the value of H / T is 0.
- the value of H is set (designed) so as to take 8 to 1.5, it is possible to enjoy the same operational effects as those already described with respect to the method for forming the plate glass.
- the value of H is set so that the value of the ratio H / T is 1.1 to 1.3.
- the protruding dimension H is gradually increased along a direction in which the molten glass flows down the inclined surface portion.
- the thickness of the molten glass flowing down the inclined surface portion of the formed body can be suppressed from becoming uneven in the width direction. It is possible to improve the smoothness of the surface of the plate glass formed from the molten glass.
- FIG. 1 is a side view showing a sheet glass forming apparatus according to a first embodiment of the present invention
- FIG. 2 is a longitudinal front view thereof.
- a sheet glass forming apparatus is configured with a formed body 1 for carrying out the overflow downdraw method as a main element.
- the formed body 1 is long in the width direction (left and right direction in FIG. 1) of the plate glass to be manufactured, and a supply groove 2 for pouring the molten glass MG is formed at the top. Then, the molten glass MG overflowing from both sides of the supply groove 2 flows down along the outer surface 3 of the molded body 1 while being restricted by the pair of guides 4 in the width direction.
- the lower end 5 is fused and integrated. The fused and fused molten glass MG is sent downward while the front side and the back side are sandwiched by a pulling roller (not shown).
- the supply groove 2 is formed such that its bottom portion 2a has an upward gradient from the inflow source side (left side in FIG. 1) to the inflow destination side (right side in FIG. 1) of the molten glass MG. Furthermore, the overflow portion 2b, which is located at the upper end of the side wall of the supply groove 2 and is a portion where the molten glass MG overflows, is formed to have a downward slope from the inflow source side to the inflow destination side. . Thereby, the depth of the molten glass MG that has flowed into the supply groove 2 gradually becomes shallower as it moves from the inflow source side to the inflow destination side.
- the outer side surface portion 3 is formed on both sides of the supply groove 2 so as to be connected to the overflow portion 2b, and each of the pair of outer side surface portions 3 is connected to the vertical surface portion 3a perpendicular to the horizontal surface and below the vertical surface portion 3a. It consists of the inclined surface part 3b.
- the pair of inclined surface portions 3 b are inclined by an angle ⁇ with respect to the vertical surface portion 3 a, approach each other as they move downward, and merge at the lower end portion 5 of the molded body 1. Thereby, a pair of inclined surface part 3a makes a wedge shape.
- the value of ⁇ is preferably 1 to 10 [°].
- a flat plate member is attached to each end in the longitudinal direction of the molded body 1, and the outer peripheral edge portion protrudes away from the outer surface portion 3.
- the projecting portion forms a guide 4 and extends along a path (direction) through which the molten glass MG flows down, thereby restricting the spread of the molten glass MG in the width direction.
- a material of the guide 4 flat plate member
- a material containing a platinum group element such as platinum or rhodium can be used.
- the protrusion dimension H from the inclined surface portion 3b of the guide 4 is set (designed) based on the thickness T of the molten glass MG flowing down between the pair of guides 4, and the value of the ratio H / T is 0.8.
- each of the guides 4 protruding from the pair of outer surface portions 3 has a protruding dimension H from the inclined surface portion 3b that decreases as it moves downward in the vicinity of the lower end portion 5 of the molded body 1, and the molded body 1 The height H becomes zero at the lower end 5 of the.
- each of a pair of guide 4 has the mutually same protrusion dimension H from the inclined surface part 3b.
- the protrusion dimension from the vertical surface part 3a of the guide 4 is made the same as H of the upper operation.
- the value of the thickness T [m] of the molten glass is that the average viscosity of the molten glass MG is ⁇ [Pa ⁇ s], the flow rate is V [m 3 / s], the density is ⁇ [kg / m 3 ], gravity
- the acceleration is set to g [m / s 2 ], and from these parameters and the angle ⁇ described above, for example, the thickness is determined in advance by the following [Formula 1] formula. Based on the determined design thickness, the projection dimension H from the inclined surface portion 3b of the guide 4 is set (designed).
- the value of T calculated from this [Equation 1] is the average thickness of the molten glass MG flowing down between the pair of guides 4, and the thickness of the molten glass MG is the portion excluding both ends in the width direction. , Approximately equal to this average thickness.
- the ratio H / T is set by predetermining the thickness T (design thickness) of the molten glass MG flowing down the inclined surface portion 3b, and the inclination of the guide 4 from this T value.
- the thickness of the guide 4 is controlled by controlling each parameter of the equation (1) with respect to the predetermined protrusion dimension H from the inclined surface portion 3b of the guide 4. It is also possible to adjust T.
- the molten glass MG flowing down between the pair of guides 4 is separated from the guide 4 in the vicinity of the guide 4 due to the influence of gravity and the surface tension of the molten glass MG, and toward the center in the width direction.
- a flow (hereinafter referred to as a separate flow) occurs.
- the present inventor changed the ratio H / T between the protrusion dimension H of the guide 4 from the inclined surface portion 3b and the thickness T of the molten glass MG flowing down between the pair of guides 4.
- this separated flow it has been found that the degree of separation from the guide 4 and toward the center in the width direction changes.
- the value of H / T is set to take 0.8 to 1.5, more preferably 1.1 to 1.3, the generation of separated flow is made as much as possible. It was found that it can be suppressed. Thereby, in the both ends in the width direction of molten glass MG, it can prevent that the thickness becomes a locally thin part and a thick part with respect to the center part. As a result, the thickness of the molten glass MG flowing down is suppressed from being non-uniform in the width direction, and the smoothness on the surface of the plate glass formed from the molten glass MG can be improved.
- FIG. 6 is a longitudinal sectional front view showing a sheet glass forming apparatus according to the second embodiment of the present invention.
- the difference between the sheet glass forming apparatus according to the second embodiment and the sheet glass forming apparatus according to the first embodiment is that the change in the viscosity of the molten glass MG flowing down the inclined surface portion 3b is taken into consideration.
- the protrusion dimension H from the inclined surface portion 3b of the guide 4 is set (designed). That is, the molten glass MG flowing down along the inclined surface portion 3b gradually decreases in temperature as it flows down, so that the viscosity of the molten glass MG gradually increases as it flows down. I put it.
- the thickness T (average thickness) of the molten glass MG is determined as a design thickness based only on the [Equation 1] formula.
- the viscosity of the molten glass MG is ⁇ [Pa ⁇ s] and the absolute temperature is t [K].
- the three constants determined by the composition of MG are A, B, and t 0 , and the thickness T of the molten glass MG is designed based on the following [Equation 2] formula (Vogel-Fulcher-tamman formula). The thickness is determined.
- the thickness T of the molten glass takes a different value (gradually increases) at each position of the inclined surface portion 3b along the direction in which the molten glass MG flows down.
- the protruding dimension H is set (designed) so that the value of the ratio H / T is 0.8 to 1.5, more preferably 1.1 to 1.3. Thereby, the protrusion dimension H is gradually increased along the direction in which the molten glass MG flows down the inclined surface portion 3b.
- the value of the ratio H / T is set as described above by setting the thickness T (design thickness) of the molten glass MG flowing down the inclined surface portion 3b.
- the protrusion dimension H from the inclined surface portion 3b of the guide 4 is determined in advance. It can also be set as the aspect which adjusts the thickness T by controlling each parameter of [Formula 1] Formula and [Formula 2] Formula.
- the molten glass MG contains, in mass%, SiO 2 : 50 to 80%, Al 2 O 3 : 5 to 25%, B 2 O 3 : 0 to 15%, Na 2 O: 1 to 20%, K 2 O : 0 to 10%.
- the flow rate V of the molten glass is 0.4 [m 3 / h]
- the density ⁇ is 2500 [kg / m 3 ]
- the angle ⁇ is 20 [°], as shown in FIG.
- the protruding dimension H from the inclined surface portion 3b of the guide 4 from the formulas [1] and [2] is as shown in FIG. Become.
- the “inclined surface portion position” on the vertical axis in FIG. 8 refers to the inclined surface portion 3b by the numerical value taken from the origin to the vertical axis, with the position X shown in FIG. 6 (the position where the protrusion dimension H is maximized) as the origin. A position separated upward is shown.
- the plate glass forming method according to the first embodiment can be obtained by the plate glass forming method according to the second embodiment.
- the projecting dimension H gradually increases. Therefore, it is advantageous in optimizing the force F that prevents the separated flow.
- the sheet glass forming apparatus is not limited to the configuration described in the above embodiment.
- the guide (flat plate member) and the molded body are configured as separate members, but may be configured such that they are integrally formed.
- the protruding dimension from the inclined surface portion of the guide and the protruding dimension from the vertical surface portion are the same, but they may be different.
- size of the protrusion dimension from the vertical surface part of a guide does not affect the effect of this invention substantially.
- a protrusion dimension is gradually enlarged along the direction in which a molten glass flows down an inclined surface part based on [Equation 1] Formula and [Equation 2] Formula, Not as long.
- the projection dimension H is set (designed) so that the ratio H / T takes 0.8 to 1.5, more preferably 1.1 to 1.3, the projection dimension H may not be set based on these equations.
- the sheet glass forming apparatus has the same configuration as the sheet glass forming apparatus according to the above-described embodiment of the present invention.
- each numerical value in this example is a numerical value obtained by converting each numerical value in the simulation experiment when a full-size molded body is used.
- the thickness T (average thickness) of the molten glass flowing down between the pair of guides was determined using the above [Equation 1].
- the value of T was 22 [mm] in this example.
- the protrusion dimension H from the inclined surface portion of the guide is as follows.
- the laser is directed toward the molten glass from a line type laser arranged so as to extend in the width direction so as to face the molten glass that is flowing down.
- the thickness distribution in the width direction of the molten glass was determined based on the reflected light.
- the standard deviation ⁇ of the thickness of the molten glass was calculated at a width of 80 [mm] and a width of 160 [mm] from the guide.
- the thickness distribution in the width direction of the molten glass is shown in FIG. 4, and the standard deviation ⁇ of the thickness of the molten glass in the width of 80 [mm] and 160 [mm] from the guide is shown in FIG. From FIG. 4, it can be seen that the thickness of the molten glass has a distribution with less unevenness compared to the comparative example. Furthermore, from FIG. 5, the standard deviation (sigma) of the thickness of a molten glass is small in the Example with respect to a comparative example. That is, the variation in the thickness of the molten glass is reduced in the width direction.
- the ratio H / T between the protrusion dimension H from the inclined surface portion of the guide and the thickness T of the molten glass is preferably 0.8 to 1.5, more preferably 1.1. If it is set to take 1.3, the thickness in the width direction of the molten glass flowing down the inclined surface portion is suppressed, and as a result, the smoothness on the surface of the plate glass formed from the molten glass is improved. It is assumed that it can be made.
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Abstract
Description
図1は、本発明の第一実施形態に係る板ガラスの成形装置を示す側面図であり、図2は、その縦断正面図である。これらの図に示すように、板ガラスの成形装置は、オーバーフローダウンドロー法を実施するための成形体1を主要な要素として構成される。
以下、本発明の第二実施形態に係る板ガラスの成形装置について説明する。なお、第二実施形態に係る板ガラスの成形装置の説明において、上記の第一実施形態に係る板ガラスの成形装置で既に説明した構成要素と同一の機能、又は、形状を有する構成要素については、第二実施形態を説明するための説明文、及び図面に同一の符号を付すことで重複する説明を省略し、第一実施形態との相違点についてのみ説明する。
比較例1: H=17[mm] H/T=0.77
実施例1: H=22[mm] H/T=1.00
実施例2: H=25[mm] H/T=1.14
実施例3: H=29[mm] H/T=1.32
比較例2: H=34[mm] H/T=1.55
なお、各板ガラスの成形装置に備えられた成形体において、一対のガイド間を流下する溶融ガラスの粘度、流量、密度、表面張力は同一であって、粘度:4000[Pa・s]、流量:0.24[m3/h]、密度:2500[kg/m3]となっている。さらに、傾斜面部の垂直面部に対する傾斜角度は、40[°]であり、傾斜面部の全長は、500[mm]である。加えて、一対のガイドの離間距離は、3000[mm]である。
2 供給溝
3 外側面部
3a 垂直面部
3b 傾斜面部
4 ガイド
5 下端部
MG 溶融ガラス
T 一対のガイド間を流下する溶融ガラスの厚み
H ガイドの傾斜面部からの突出寸法
Claims (6)
- 成形体の頂部に形成された供給溝から両側に溢れ出た溶融ガラスを、前記成形体の楔状をなす傾斜面部に沿って、その幅方向における広がりを一対のガイドで規制しつつ流下させ、前記成形体の下端部で融合一体化させて板ガラスを成形する板ガラスの成形方法において、
前記ガイドの前記傾斜面部からの突出寸法をHとし、一対のガイド間を流下する前記溶融ガラスの厚みをTとしたとき、その比率H/Tの値が、0.8~1.5に設定されていることを特徴とする板ガラスの成形方法。 - 前記比率H/Tの値が、1.1~1.3に設定されていることを特徴とする請求項1に記載の板ガラスの成形方法。
- 前記突出寸法Hを、前記溶融ガラスが前記傾斜面部を流下する方向に沿って漸次に大きくすることを特徴とする請求項1又は2に記載の板ガラスの成形方法。
- 頂部に形成された供給溝から両側に溢れ出た溶融ガラスを、楔状をなす傾斜面部に沿って、その幅方向における広がりを一対のガイドで規制しつつ流下させ、下端部で融合一体化させて板ガラスを成形する成形体を備えた板ガラスの成形装置において、
前記ガイドの前記傾斜面部からの突出寸法をHとし、一対のガイド間を流下する前記溶融ガラスの厚みをTとしたとき、その比率H/Tの値が、0.8~1.5をとるようにHの値が設定されていることを特徴とする板ガラスの成形装置。 - 前記比率H/Tの値が、1.1~1.3をとるようにHの値が設定されていることを特徴とする請求項4に記載の板ガラスの成形装置。
- 前記突出寸法Hを、前記溶融ガラスが前記傾斜面部を流下する方向に沿って漸次に大きくすることを特徴とする請求項4又は5に記載の板ガラスの成形装置。
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JP2014514982A JP6331148B2 (ja) | 2013-04-01 | 2014-04-01 | 板ガラスの成形方法、及び板ガラスの成形装置 |
CN201480002760.4A CN104736488B (zh) | 2013-04-01 | 2014-04-01 | 玻璃板的成形方法、及玻璃板的成形装置 |
US14/762,972 US20150353408A1 (en) | 2013-04-01 | 2014-04-01 | Sheet glass forming method and sheet glass forming device |
KR1020157007896A KR102082724B1 (ko) | 2013-04-01 | 2014-04-01 | 판 유리의 성형 방법, 및 판 유리의 성형 장치 |
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WO2016144869A1 (en) * | 2015-03-12 | 2016-09-15 | Ppg Industries Ohio, Inc. | Optoelectronic device and method of making the same |
US9818888B2 (en) | 2015-03-12 | 2017-11-14 | Vitro, S.A.B. De C.V. | Article with buffer layer and method of making the same |
CN114477728A (zh) * | 2021-12-16 | 2022-05-13 | 蚌埠中光电科技有限公司 | 超薄电子玻璃的成型装置及其操作方法 |
JP2022550786A (ja) * | 2019-09-29 | 2022-12-05 | 彩虹顕示器件股▲ふん▼有限公司 | オーバーフローれんが及びその薄板成形厚さ制御方法 |
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US9840431B2 (en) * | 2016-01-11 | 2017-12-12 | Corning Incorporated | Methods and apparatuses for supporting forming bodies of glass forming apparatuses |
JP2019510725A (ja) | 2016-04-07 | 2019-04-18 | コーニング インコーポレイテッド | 連続ガラスリボンを形成するための形成体およびそれを備えたガラス形成装置 |
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- 2014-04-01 WO PCT/JP2014/059609 patent/WO2014163063A1/ja active Application Filing
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WO2016144869A1 (en) * | 2015-03-12 | 2016-09-15 | Ppg Industries Ohio, Inc. | Optoelectronic device and method of making the same |
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CN107408585A (zh) * | 2015-03-12 | 2017-11-28 | Vitro可变资本股份有限公司 | 光电器件及其制造方法 |
RU2673778C1 (ru) * | 2015-03-12 | 2018-11-29 | Витро, С.А.Б. Де С.В. | Оптоэлектронное устройство и способ его изготовления |
CN107408585B (zh) * | 2015-03-12 | 2020-05-19 | 维特罗平板玻璃有限责任公司 | 光电器件及其制造方法 |
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CN104736488B (zh) | 2017-05-10 |
TW201439017A (zh) | 2014-10-16 |
JP6331148B2 (ja) | 2018-05-30 |
CN104736488A (zh) | 2015-06-24 |
US20150353408A1 (en) | 2015-12-10 |
KR20150140264A (ko) | 2015-12-15 |
JPWO2014163063A1 (ja) | 2017-02-16 |
KR102082724B1 (ko) | 2020-02-28 |
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