WO2015079768A1 - Reinforced glass sheet and method for manufacturing same - Google Patents

Reinforced glass sheet and method for manufacturing same Download PDF

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Publication number
WO2015079768A1
WO2015079768A1 PCT/JP2014/073681 JP2014073681W WO2015079768A1 WO 2015079768 A1 WO2015079768 A1 WO 2015079768A1 JP 2014073681 W JP2014073681 W JP 2014073681W WO 2015079768 A1 WO2015079768 A1 WO 2015079768A1
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Prior art keywords
glass plate
glass
plate
tempered
glass sheet
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PCT/JP2014/073681
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French (fr)
Japanese (ja)
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一伸 國友
清貴 木下
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日本電気硝子株式会社
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Publication of WO2015079768A1 publication Critical patent/WO2015079768A1/en

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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C21/00—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
    • C03C21/001—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions
    • C03C21/002—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions to perform ion-exchange between alkali ions
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
    • C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium

Definitions

  • the present invention relates to a tempered glass plate and a manufacturing method thereof, and more specifically, to a tempered glass plate chemically strengthened by an ion exchange method and a manufacturing method thereof.
  • a chemically strengthened tempered glass plate has been used for a touch panel display mounted on an electronic device such as a smartphone or a tablet PC.
  • Such a tempered glass plate is generally manufactured by immersing a glass substrate containing an alkali metal oxide as a composition in a tempered liquid at a predetermined temperature and performing ion exchange. However, when such a chemical strengthening process is performed, the glass substrate may be warped and deformed.
  • Patent Document 1 a tempering method for suppressing warpage of the glass plate.
  • the manufacturing method of the tempered glass disclosed by patent document 1 changes the support position of the plate glass in a tempered liquid tank according to the ratio of the long side of this plate glass, and a short side. With such a configuration, warping of the glass plate during strengthening is suppressed.
  • a glass plate 1 formed by drawing molten glass as a glass ribbon, such as the overflow downdraw method or the float method, has a plurality of ridges and grooves extending continuously in the drawing direction D as shown in FIG. Has on the front and back.
  • the drawn glass plate 1 has minute wavy undulations on the front and back surfaces in the width direction W (direction perpendicular to the drawing direction D) of the glass ribbon.
  • the glass plate 1 that has been drawn is easily deformed with respect to the bending moment Md with the drawing direction D as the axis, and is deformed with respect to the bending moment Md with the width direction W as the axis. hard. Accordingly, when the weight of the glass plate 1 is formed by pulling, the glass plate 1 is easily deformed so as to warp in the width direction W (swell formation direction) of the glass ribbon at the time of molding.
  • the present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a chemically strengthened glass plate that is excellent in flatness with little deformation such as warpage, and a method for producing the same.
  • the method for producing a tempered glass plate of the present invention is a method for producing a tempered glass plate obtained by processing a glass plate using an ion exchange method to obtain a tempered glass plate, wherein the molten glass is drawn out in a predetermined drawing direction.
  • the method for producing a tempered glass plate of the present invention it is possible to obtain a chemically tempered glass plate having excellent flatness with less deformation such as warpage during tempering, by preventing its own weight from acting in a direction in which the glass plate tends to warp.
  • the glass sheet in the tempering step, is immersed in the tempered liquid tank in such a posture that the drawing direction at the time of forming the glass sheet is within a range of 0 to 30 ° with respect to the vertical direction. It is preferable.
  • the method for producing a tempered glass sheet of the present invention it is preferable that at least one side of the glass sheet is formed along the drawing direction.
  • the pulling direction of the glass plate can be easily recognized, and the attitude control of the glass plate is facilitated.
  • the method for producing a tempered glass sheet of the present invention it is preferable to immerse the glass sheet in a tempered liquid tank while supporting both side ends of the glass sheet in the strengthening step.
  • the entire surface of the glass plate can be uniformly chemically strengthened.
  • the method for producing a tempered glass sheet of the present invention it is preferable to form the glass sheet using an overflow down draw method in the forming step.
  • the tempered glass sheet of the present invention is a tempered glass sheet produced by any of the above methods, and the rate of change from before and after the tempering of the height from the surface plate measured by placing on the surface plate is 40% or less. It is.
  • FIG. It is a figure which shows an example of the formation process of the tempered glass board of this invention. It is a figure which shows a mode that the glass plate 1 was set to the jig
  • FIG. It is a figure which shows an example of the reinforcement
  • FIG. It is an image figure of the front-and-back surface shape of the glass plate 1 shape
  • the method for producing a tempered glass plate of the present invention includes a forming step of obtaining glass plate 1 by forming molten glass into a plate shape by drawing it in a predetermined drawing direction, and a strengthening step of chemically strengthening glass plate 1.
  • a forming step of obtaining glass plate 1 by forming molten glass into a plate shape by drawing it in a predetermined drawing direction and a strengthening step of chemically strengthening glass plate 1.
  • FIG. 1 is a diagram showing an example of a process for forming a tempered glass sheet of the present invention.
  • a glass raw material is melted in a melting furnace (not shown), and the obtained molten glass is supplied to the molding apparatus 2.
  • the glass ribbon 3 is obtained by drawing the molten glass from the forming device 2 into a ribbon shape and forming it.
  • any method may be used as long as it is a method for drawing out molten glass.
  • an overflow downdraw method, a float method, a slot downdraw method, or the like may be used. Since the glass plate 1 having high surface quality can be obtained, it is particularly preferable to use the overflow down draw method.
  • the glass ribbon 3 contains an alkali metal as a glass composition, and more preferably by mass%, SiO 2 50-80%, Al 2 O 3 5-25%, B 2 O 3 0- Pre-formulated to contain 15%, Na 2 O 1-20%, K 2 O 0-10%. If the glass composition range is regulated as described above, it becomes easy to achieve both ion exchange performance and devitrification resistance at a high level.
  • the composition of the glass ribbon 3 is an example, and any glass composition may be used as long as chemical strengthening is possible.
  • the glass ribbon 3 is cut to obtain the glass plate 1.
  • the drawing direction flow direction of the glass ribbon 3 at the time of molding
  • the drawing direction D the direction parallel to the main surface of the glass plate 1 and perpendicular to the drawing direction D (the width of the glass ribbon 3).
  • Direction is a transverse direction W.
  • the glass plate 1 obtained by cutting in this way has a side formed along the drawing direction D. 1 to 5, the drawing direction D in the glass plate 1 is indicated by a broken line.
  • the arbitrary methods may be used for the cutting method of the glass ribbon 3.
  • a method of cleaving after forming a scribe, a method of fusing by irradiating a laser beam, or the like can be used.
  • the dimensions of the glass plate 1 may be arbitrary, but are, for example, a length of 200 to 3000 mm, a width of 200 to 3000 mm, and a thickness of 0.05 to 2.0 mm. In such a large area and thin glass plate, warping during tempering is particularly likely to occur compared to a small area and thick glass plate, and thus the warp suppressing effect by the method for producing a tempered glass plate of the present invention is sufficient. Can demonstrate.
  • the jig 5 is a support member that supports the outer peripheral end of the glass plate 1.
  • the jig 5 includes a frame 6 configured to extend along the bottom side and both sides of the glass plate 1, and a support groove portion 7 provided on the frame and partially sandwiching each side portion of the glass plate 1.
  • the glass plate 1 can be supported without covering the main surface. Therefore, the entire main surface of the glass plate 1 can be uniformly chemically strengthened in the steps described later.
  • FIG. 3 is a cross-sectional view showing how the glass plate 1 is strengthened in the strengthening liquid tank 9.
  • the strengthening liquid 8 is, for example, a molten salt such as potassium nitrate or sodium nitrate, or a mixed molten salt thereof.
  • the rotation posture in the plate surface direction of the glass plate 1 is determined so that the angle of the drawing direction D of the glass plate 1 with respect to the vertical direction G is within a predetermined range.
  • the glass plate 1 has an inclination angle ⁇ in the pulling direction D with respect to the vertical direction G of 0 ° or more and less than 40 °, and more preferably, the inclination angle ⁇ is in the range of 0 to 35 ° and 0 to 25 °.
  • Determine the attitude Most preferably, as shown in FIG. 4, the attitude of the glass plate 1 is determined so that the inclination angle ⁇ is 0 °, that is, the drawing direction D is substantially the same as the vertical direction G.
  • the vertical direction G is indicated by a one-dot chain line.
  • An arbitrary method may be used as a method for adjusting the attitude of the glass plate 1.
  • the glass plate 1 can be adjusted by adjusting a fixture (not shown) for fixing the jig 5 in the reinforcing liquid tank 9.
  • the tempered glass plate 10 can be obtained by performing the ion exchange treatment while maintaining the temperature range of 340 to 490 ° C. for 10 to 10,000 minutes. .
  • the tempered glass sheet 10 having excellent flatness can be obtained.
  • the rate of change before and after strengthening the warp of the tempered glass 10 is preferably 40% or less.
  • the amount of warpage of the tempered glass 10 before and after tempering is measured by placing the tempered glass 10 before and after tempering on a horizontal surface plate and measuring the maximum height from the surface plate to the surface of the tempered glass 10. Is possible.
  • the direction in which the glass plate 1 is cut out may be arbitrarily determined.
  • the glass plate 1 may be cut so that its side and the drawing direction D are inclined by an arbitrary angle ⁇ . Even in such a case, warping of the glass plate 1 can be suppressed by controlling the posture of the glass plate 1 in the strengthening step so that the inclination angle ⁇ is within the above-mentioned range.
  • the drawing direction D is easily visually recognized in the direction of the side. Therefore, it becomes easy to control the posture of the glass plate 1 in the strengthening process. Further, it is preferable that the glass plate 1 has a rectangular shape because the side, top and bottom sides can be easily distinguished from each other, and the drawing direction D can be more easily recognized.
  • the shape of the glass plate 1 is not restricted above.
  • the glass plate 1 may be an elliptical plate shape.
  • the jig 5 is configured separately from the strengthening tank 7
  • the jig 5 and the strengthening tank 7 may be configured integrally.
  • the configuration of the jig 5 is an example, and any configuration may be adopted as long as the jig 5 can be supported in an upright posture without covering the main surface of the glass plate 1.
  • the jig 5 may further include a frame for supporting the upper end portion of the glass plate 1 and a support groove portion.
  • the support groove portion 7 may be a long groove that is sandwiched over the entire end side of the glass plate 1.
  • the plate glass may be subjected to a predetermined process such as a polishing process after the molding process, before or after the strengthening process.
  • Table 1 shows examples of the present invention.
  • the glass composition contains SiO 2 62%, Al 2 O 3 19.7%, B 2 O 3 3.6%, Na 2 O 13.2%, and MgO 1.5% by mass%.
  • the glass raw material was weighed and mixed to prepare a glass batch.
  • this glass batch was melted in a melting furnace, it was drawn out as a glass ribbon using an overflow down draw method. And the obtained glass ribbon was cut
  • the glass samples Nos. 1, 3 to 7 were cut so that the angle ⁇ formed between the side and the drawing direction D was 0 °.
  • the glass sample 2 was cut so that the angle ⁇ was 40 °.
  • the amount of warpage C1 before strengthening was measured for each glass sample obtained as described above. Specifically, each glass sample was placed on a horizontal surface plate, the height from the surface plate to the surface of the glass sample was measured at a plurality of locations, and the maximum value was obtained as the warpage amount C1.
  • each glass sample was chemically strengthened. Specifically, first, the glass sample was heated up to 430 ° C. over 90 minutes in an electric furnace, and preheated by holding at 430 ° C. for 30 minutes. Thereafter, each preheated glass sample was immersed for 180 minutes in a tempered liquid tank filled with a molten salt of potassium nitrate at 430 ° C. in a posture having an inclination angle ⁇ shown in Table 1. Thereafter, the chemically tempered glass sample was drawn from the tempering bath into an air atmosphere at 300 ° C., and the temperature was lowered over 120 minutes until the atmospheric temperature reached 150 ° C.
  • the warped amount C2 after strengthening was measured by the same method as the warped amount C1 before strengthening. Further, the difference value between the warpage amount C1 before strengthening and the warpage amount C2 after strengthening was calculated as the amount of change in warpage. Further, the ratio between the warpage amount C1 before strengthening and the warpage change amount was calculated as the warpage change rate.
  • the tempered glass plate and the method for producing the same of the present invention are useful as a glass substrate used for a touch panel display and a method for producing the same.

Abstract

A method for manufacturing a reinforced glass sheet, comprising treating a glass sheet using an ion exchange method and obtaining a reinforced glass sheet, the method including: a molding step for molding molten glass into a sheet shape by drawing the molten glass in a predetermined draw direction, and obtaining a glass sheet; and a reinforcing step for dipping the glass sheet in a reinforcing liquid tank in a substantially upright state and obtaining a reinforced glass sheet; the orientation of the sheet surface direction of the glass sheet in the reinforcing step being determined according to the draw direction during molding of the glass sheet.

Description

強化ガラス板およびその製造方法Tempered glass plate and manufacturing method thereof
　本発明は、強化ガラス板およびその製造方法に関し、より具体的には、イオン交換法によって化学強化された強化ガラス板およびその製造方法に関する。 The present invention relates to a tempered glass plate and a manufacturing method thereof, and more specifically, to a tempered glass plate chemically strengthened by an ion exchange method and a manufacturing method thereof.
　従来、スマートフォンやタブレットＰＣなどの電子機器に搭載されるタッチパネルディスプレイには、化学強化された強化ガラス板が用いられている。 Conventionally, a chemically strengthened tempered glass plate has been used for a touch panel display mounted on an electronic device such as a smartphone or a tablet PC.
　このような強化ガラス板は、一般的に、アルカリ金属酸化物を組成として含むガラス基板を所定温度の強化液に浸漬してイオン交換することによって製造される。しかしながら、このような化学強化処理を行った際に、ガラス基板が反って変形してしまう場合があった。 Such a tempered glass plate is generally manufactured by immersing a glass substrate containing an alkali metal oxide as a composition in a tempered liquid at a predetermined temperature and performing ion exchange. However, when such a chemical strengthening process is performed, the glass substrate may be warped and deformed.
　このような問題を解決すべく、ガラス板の反りを抑制する強化処理方法が開発されている（例えば、特許文献１）。特許文献１に開示される強化ガラスの製造方法は、強化液槽中における板ガラスの支持位置を該板ガラスの長辺および短辺の比率に応じて変更する。このような構成によって、強化時のガラス板の反りを抑制する。 In order to solve such a problem, a tempering method for suppressing warpage of the glass plate has been developed (for example, Patent Document 1). The manufacturing method of the tempered glass disclosed by patent document 1 changes the support position of the plate glass in a tempered liquid tank according to the ratio of the long side of this plate glass, and a short side. With such a configuration, warping of the glass plate during strengthening is suppressed.
特開２００４‐１８９５６２号公報JP 2004-189562 A
　化学強化処理を行った際のガラス板の反りの原因の一つとして、強化中のガラス板の姿勢に起因する自重変形が挙げられる。さらに、本発明者らの検討の結果、このようなガラス板の自重変形には成形方法の影響があることが明らかとなった。 One of the causes of warping of the glass plate when performing chemical strengthening treatment is deformation due to its own weight due to the posture of the glass plate being strengthened. Furthermore, as a result of the study by the present inventors, it has been clarified that the deformation of the glass plate due to its own weight has an influence of the forming method.
　オーバーフローダウンドロー法やフロート法等のように溶融ガラスをガラスリボンとして引き出して成形されたガラス板１は、図６に示すように引き出し方向Ｄに連続的に延びる複数の凸条部および凹溝部を表裏面に有している。換言すれば、引き出し成形されたガラス板１は、ガラスリボンの幅方向Ｗ（引き出し方向Ｄと垂直な方向）に微小な波状のうねりを表裏面に有している。このような表裏面形状により、引き出し成形されたガラス板１は、引き出し方向Ｄを軸とする曲げモーメントＭｄに対して変形し易く、幅方向Ｗを軸とする曲げモーメントＭｄに対しては変形し難い。したがって、引き出し成形されたガラス板１は、自重が作用した場合、成形時におけるガラスリボンの幅方向Ｗ（うねりの形成方向）に反るように変形し易い。 A glass plate 1 formed by drawing molten glass as a glass ribbon, such as the overflow downdraw method or the float method, has a plurality of ridges and grooves extending continuously in the drawing direction D as shown in FIG. Has on the front and back. In other words, the drawn glass plate 1 has minute wavy undulations on the front and back surfaces in the width direction W (direction perpendicular to the drawing direction D) of the glass ribbon. With such a front and back shape, the glass plate 1 that has been drawn is easily deformed with respect to the bending moment Md with the drawing direction D as the axis, and is deformed with respect to the bending moment Md with the width direction W as the axis. hard. Accordingly, when the weight of the glass plate 1 is formed by pulling, the glass plate 1 is easily deformed so as to warp in the width direction W (swell formation direction) of the glass ribbon at the time of molding.
　従来の強化ガラス板の製造方法では、上記のような要因によるガラス板の反りを抑制することは考慮されていなかった。すなわち、従来の方法では、ガラス板の化学強化時における反りを十分に抑制することができておらず、改善の余地があった。 In the conventional method for producing a tempered glass sheet, it has not been considered to suppress the warp of the glass sheet due to the above factors. That is, in the conventional method, the curvature at the time of chemical strengthening of a glass plate could not be suppressed sufficiently, and there was room for improvement.
　本発明は、このような事情を考慮して成されたものであり、反り等の変形が少なく平坦性に優れた化学強化ガラス板およびその製造方法を提供することを課題とする。 The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a chemically strengthened glass plate that is excellent in flatness with little deformation such as warpage, and a method for producing the same.
　本発明の強化ガラス板の製造方法は、ガラス板をイオン交換法を用いて処理して強化ガラス板を得る強化ガラス板の製造方法であって、溶融ガラスを所定の引き出し方向に引き出すことにより板状に成形してガラス板を得る成形工程と、ガラス板を略直立状態で強化液槽に浸漬して強化ガラス板を得る強化工程とを含み、強化工程において、ガラス板の板面方向の姿勢をガラス板の成形時における引き出し方向に応じて定めることを特徴とする。 The method for producing a tempered glass plate of the present invention is a method for producing a tempered glass plate obtained by processing a glass plate using an ion exchange method to obtain a tempered glass plate, wherein the molten glass is drawn out in a predetermined drawing direction. Forming a glass plate by molding into a shape, and a strengthening step of obtaining a strengthened glass plate by immersing the glass plate in a tempered liquid tank in a substantially upright state, and in the strengthening step, the orientation of the glass plate in the plate surface direction Is determined in accordance with the drawing direction at the time of forming the glass plate.
　本発明の強化ガラス板の製造方法によれば、ガラス板が反り易い方向に自重が作用することを防ぎ、強化時の反り等の変形が少なく平坦性に優れた化学強化ガラス板を得られる。 According to the method for producing a tempered glass plate of the present invention, it is possible to obtain a chemically tempered glass plate having excellent flatness with less deformation such as warpage during tempering, by preventing its own weight from acting in a direction in which the glass plate tends to warp.
　本発明の強化ガラス板の製造方法では、強化工程において、ガラス板の成形時における引き出し方向が、鉛直方向に対して０～３０°の範囲内となる姿勢でガラス板を強化液槽に浸漬させることが好ましい。 In the method for producing a tempered glass sheet of the present invention, in the tempering step, the glass sheet is immersed in the tempered liquid tank in such a posture that the drawing direction at the time of forming the glass sheet is within a range of 0 to 30 ° with respect to the vertical direction. It is preferable.
　上記のような構成によれば、より確実に強化後の反りを抑制できる。 According to the above configuration, warping after strengthening can be suppressed more reliably.
　本発明の強化ガラス板の製造方法では、ガラス板の少なくとも一辺が引き出し方向に沿って形成されていることが好ましい。 In the method for producing a tempered glass sheet of the present invention, it is preferable that at least one side of the glass sheet is formed along the drawing direction.
　上記のような構成によれば、ガラス板の引き出し方向を容易に視認でき、ガラス板の姿勢制御が容易となる。 According to the above configuration, the pulling direction of the glass plate can be easily recognized, and the attitude control of the glass plate is facilitated.
　本発明の強化ガラス板の製造方法では、強化工程において、ガラス板の両側端部を支持した状態で該ガラス板を強化液槽に浸漬することが好ましい。 In the method for producing a tempered glass sheet of the present invention, it is preferable to immerse the glass sheet in a tempered liquid tank while supporting both side ends of the glass sheet in the strengthening step.
　上記のような構成によれば、ガラス板の主面が覆われないため、ガラス板の全面を均一に化学強化できる。 According to the above configuration, since the main surface of the glass plate is not covered, the entire surface of the glass plate can be uniformly chemically strengthened.
　本発明の強化ガラス板の製造方法では、成形工程において、オーバーフローダウンドロー法を用いてガラス板を成形することが好ましい。 In the method for producing a tempered glass sheet of the present invention, it is preferable to form the glass sheet using an overflow down draw method in the forming step.
　上記のような構成によれば、表面品位の高い強化ガラス板を得られる。 According to the above configuration, a tempered glass plate with high surface quality can be obtained.
　本発明の強化ガラス板は、上記いずれかの方法で製造された強化ガラス板であって、定盤に載置して測定した定盤からの高さの前記強化前後の変化率が４０％以下である。 The tempered glass sheet of the present invention is a tempered glass sheet produced by any of the above methods, and the rate of change from before and after the tempering of the height from the surface plate measured by placing on the surface plate is 40% or less. It is.
本発明の強化ガラス板の成形工程の一例を示す図である。It is a figure which shows an example of the formation process of the tempered glass board of this invention. ガラス板１が治具５にセットされた様子を示す図である。It is a figure which shows a mode that the glass plate 1 was set to the jig | tool 5. FIG. 本発明の実施形態の強化ガラス板の強化工程の一例を示す図である。It is a figure which shows an example of the reinforcement | strengthening process of the tempered glass board of embodiment of this invention. 本発明の実施形態の強化ガラス板の強化工程において傾斜角αが０°である場合を示す図である。It is a figure which shows the case where the inclination | tilt angle (alpha) is 0 degree in the reinforcement | strengthening process of the tempered glass board of embodiment of this invention. ガラス板１の側辺が引き出し方向Ｄに対し角度β傾斜している場合を示す図である。It is a figure which shows the case where the side edge of the glass plate 1 inclines angle (beta) with respect to the drawing-out direction D. FIG. 引き出し成形されたガラス板１の表裏面形状のイメージ図である。It is an image figure of the front-and-back surface shape of the glass plate 1 shape | molded by drawing.
　以下、本発明の実施形態の強化ガラス板およびその製造方法について説明する。 Hereinafter, the tempered glass plate and the manufacturing method thereof according to the embodiment of the present invention will be described.
　本発明の強化ガラス板の製造方法は、溶融ガラスを所定の引き出し方向に引き出すことにより板状に成形してガラス板１を得る成形工程と、ガラス板１を化学強化する強化工程とを含む。以下、各工程について詳細に説明する。 The method for producing a tempered glass plate of the present invention includes a forming step of obtaining glass plate 1 by forming molten glass into a plate shape by drawing it in a predetermined drawing direction, and a strengthening step of chemically strengthening glass plate 1. Hereinafter, each step will be described in detail.
　図１は、本発明の強化ガラス板の成形工程の一例を示す図である。先ず、溶融窯（図示せず）でガラス原料を溶融し、得た溶融ガラスを成形装置２に供給する。そして、成形装置２から溶融ガラスをリボン状に引き出して成形することによって、ガラスリボン３を得る。ガラスリボン３の成形方法は、溶融ガラスを引き出す方式であれば任意の手法を用いて良い。例えば、オーバーフローダウンドロー法、フロート法、スロットダウンドロー法等を用いて良い。表面品位の高いガラス板１を得ることができるため、特にオーバーフローダウンドロー法を用いることが好ましい。 FIG. 1 is a diagram showing an example of a process for forming a tempered glass sheet of the present invention. First, a glass raw material is melted in a melting furnace (not shown), and the obtained molten glass is supplied to the molding apparatus 2. Then, the glass ribbon 3 is obtained by drawing the molten glass from the forming device 2 into a ribbon shape and forming it. As a method for forming the glass ribbon 3, any method may be used as long as it is a method for drawing out molten glass. For example, an overflow downdraw method, a float method, a slot downdraw method, or the like may be used. Since the glass plate 1 having high surface quality can be obtained, it is particularly preferable to use the overflow down draw method.
　なお、上記ガラス原料は、ガラスリボン３がガラス組成として、アルカリ金属を含有し、より好ましくは質量％で、ＳｉＯ２　５０～８０％、Ａｌ２Ｏ３　５～２５％、Ｂ２Ｏ３　０～１５％、Ｎａ２Ｏ　１～２０％、Ｋ２Ｏ　０～１０％を含有するよう予め調合される。上記のようにガラス組成範囲を規制すれば、イオン交換性能と耐失透性を高いレベルで両立し易くなる。なお、上記ガラスリボン３の組成は一例であり、化学強化可能であれば任意のガラス組成であって良い。 In the glass raw material, the glass ribbon 3 contains an alkali metal as a glass composition, and more preferably by mass%, SiO 2 50-80%, Al 2 O 3 5-25%, B 2 O 3 0- Pre-formulated to contain 15%, Na 2 O 1-20%, K 2 O 0-10%. If the glass composition range is regulated as described above, it becomes easy to achieve both ion exchange performance and devitrification resistance at a high level. The composition of the glass ribbon 3 is an example, and any glass composition may be used as long as chemical strengthening is possible.
　次いで、ガラスリボン３を切断してガラス板１を得る。得られたガラス板１における、成形時の引き出し方向（ガラスリボン３の流れ方向）を引き出し方向Ｄとし、ガラス板１の主面に平行で且つ引き出し方向Ｄに垂直な方向（ガラスリボン３の幅方向）を横断方向Ｗとする。本実施形態では、切断装置４により横断方向Ｗに沿ってガラスリボン３を切断し、さらに端部を切り落とした中央部分を矩形状のガラス板１として得た場合を一例として説明する。このように切断して得たガラス板１は、側辺が引き出し方向Ｄに沿って形成されている。なお、図１から５において、ガラス板１における引き出し方向Ｄを破線で示す。 Next, the glass ribbon 3 is cut to obtain the glass plate 1. In the obtained glass plate 1, the drawing direction (flow direction of the glass ribbon 3) at the time of molding is defined as the drawing direction D, and the direction parallel to the main surface of the glass plate 1 and perpendicular to the drawing direction D (the width of the glass ribbon 3). Direction) is a transverse direction W. In the present embodiment, a case where the glass ribbon 3 is cut along the transverse direction W by the cutting device 4 and the center portion obtained by cutting off the end portion is obtained as the rectangular glass plate 1 will be described as an example. The glass plate 1 obtained by cutting in this way has a side formed along the drawing direction D. 1 to 5, the drawing direction D in the glass plate 1 is indicated by a broken line.
　なお、ガラスリボン３の切断方法は任意の手法を用いて良い。例えば、スクライブを形成した後で割断する方法、レーザー光を照射して溶断する方法等を用いることができる。また、ガラス板１を得る際には、例えば両側端部等の不要部位を切り落としても良い。また、小片のガラス板１を得る場合には、ガラスリボン３を予め大板の母ガラスとして切り出した後に複数の小片ガラス板１を切り出しても良い。 In addition, the arbitrary methods may be used for the cutting method of the glass ribbon 3. For example, a method of cleaving after forming a scribe, a method of fusing by irradiating a laser beam, or the like can be used. Moreover, when obtaining the glass plate 1, you may cut off unnecessary parts, such as a both-ends part, for example. Moreover, when obtaining the glass plate 1 of a small piece, you may cut out the several small glass plate 1 after cutting out the glass ribbon 3 beforehand as a mother glass of a large board.
　ガラス板１の寸法は、任意として良いが、例えば、長さ２００～３０００ｍｍ、幅２００～３０００ｍｍ、厚さ０．０５～２．０ｍｍである。このような大面積で且つ薄いガラス板では、小面積で厚いガラス板に比べ、特に強化時の反りが発生し易くなるため、本発明の強化ガラス板の製造方法による反りの抑制効果を十分に発揮できる。 The dimensions of the glass plate 1 may be arbitrary, but are, for example, a length of 200 to 3000 mm, a width of 200 to 3000 mm, and a thickness of 0.05 to 2.0 mm. In such a large area and thin glass plate, warping during tempering is particularly likely to occur compared to a small area and thick glass plate, and thus the warp suppressing effect by the method for producing a tempered glass plate of the present invention is sufficient. Can demonstrate.
　次いで、ガラス板１を図２に示すように治具５にセットする。治具５は、ガラス板１の外周端部を支持する支持部材である。具体的には、治具５は、ガラス板１の底辺および両側辺に沿うよう構成されたフレーム６と、フレームに設けられガラス板１の各辺部を部分的に挟持する支持溝部７とを備える。このような治具でガラス板１を支持することにより、ガラス板１の主面を覆うことなく支持できる。したがって、後述の工程においてガラス板１の主面全体を均一に化学強化することができる。 Next, the glass plate 1 is set on a jig 5 as shown in FIG. The jig 5 is a support member that supports the outer peripheral end of the glass plate 1. Specifically, the jig 5 includes a frame 6 configured to extend along the bottom side and both sides of the glass plate 1, and a support groove portion 7 provided on the frame and partially sandwiching each side portion of the glass plate 1. Prepare. By supporting the glass plate 1 with such a jig, the glass plate 1 can be supported without covering the main surface. Therefore, the entire main surface of the glass plate 1 can be uniformly chemically strengthened in the steps described later.
　次いで、図３に示すように、治具５にセットされたガラス板１を治具５とともに、強化液８で満たされた強化液槽９に略直立姿勢で浸漬する。なお、図３は、強化液槽９においてガラス板１が強化される様子を示した断面図である。強化液８は、例えば、硝酸カリウムや硝酸ナトリウム等の溶融塩、或いはそれらの混合溶融塩である。 Next, as shown in FIG. 3, the glass plate 1 set in the jig 5 is immersed together with the jig 5 in the reinforcing liquid tank 9 filled with the reinforcing liquid 8 in a substantially upright posture. FIG. 3 is a cross-sectional view showing how the glass plate 1 is strengthened in the strengthening liquid tank 9. The strengthening liquid 8 is, for example, a molten salt such as potassium nitrate or sodium nitrate, or a mixed molten salt thereof.
　ここで、ガラス板１を強化液槽９に浸漬する際には、鉛直方向Ｇに対するガラス板１の引き出し方向Ｄの角度が所定範囲内となるようガラス板１の板面方向の回転姿勢を定める。具体的には、鉛直方向Ｇに対する引き出し方向Ｄの傾斜角αが０°以上４０°未満、より好ましくは、傾斜角αは０～３５°、０～２５°の範囲内となるようガラス板１の姿勢を定める。もっとも好ましくは図４に示すように、傾斜角αが０°となるよう、すなわち、引き出し方向Ｄが鉛直方向Ｇと略同一方向となるようガラス板１の姿勢を定める。なお、図３では鉛直方向Ｇを一点鎖線で示す。ガラス板１の姿勢の調整方法は任意の方法を用いて良いが、例えば、強化液槽９内において治具５を固定する固定具（図示せず）を調整することで調整可能である。 Here, when the glass plate 1 is immersed in the tempered liquid tank 9, the rotation posture in the plate surface direction of the glass plate 1 is determined so that the angle of the drawing direction D of the glass plate 1 with respect to the vertical direction G is within a predetermined range. . Specifically, the glass plate 1 has an inclination angle α in the pulling direction D with respect to the vertical direction G of 0 ° or more and less than 40 °, and more preferably, the inclination angle α is in the range of 0 to 35 ° and 0 to 25 °. Determine the attitude. Most preferably, as shown in FIG. 4, the attitude of the glass plate 1 is determined so that the inclination angle α is 0 °, that is, the drawing direction D is substantially the same as the vertical direction G. In FIG. 3, the vertical direction G is indicated by a one-dot chain line. An arbitrary method may be used as a method for adjusting the attitude of the glass plate 1. For example, the glass plate 1 can be adjusted by adjusting a fixture (not shown) for fixing the jig 5 in the reinforcing liquid tank 9.
　このようにガラス板１の姿勢を規制することによって、ガラス板１が反り易い方向（方向Ｗ）への自重の作用を抑制し、ガラス板１の強化時における反りを抑制することができる。 By regulating the posture of the glass plate 1 in this way, the action of its own weight in the direction in which the glass plate 1 tends to warp (direction W) can be suppressed, and the warp during strengthening of the glass plate 1 can be suppressed.
　上記のような姿勢でガラス板１を強化液槽９に浸漬した状態で、３４０～４９０℃の温度範囲で１０～１００００分保持してイオン交換処理を行うことにより、強化ガラス板１０を得られる。 In a state where the glass plate 1 is immersed in the tempered liquid tank 9 in the above-described posture, the tempered glass plate 10 can be obtained by performing the ion exchange treatment while maintaining the temperature range of 340 to 490 ° C. for 10 to 10,000 minutes. .
　以上に説明した本発明の強化ガラス板の製造方法によれば、平坦性に優れた強化ガラス板１０を得ることができる。 According to the method for producing a tempered glass sheet of the present invention described above, the tempered glass sheet 10 having excellent flatness can be obtained.
　強化ガラス１０の反りの強化前後の変化率は４０％以下であることが好ましい。強化ガラス１０の強化前後の反り量は、強化前後の強化ガラス１０を各々水平な定盤に載置して、定盤から強化ガラス１０の表面までの高さの最大値を測定することで測定可能である。 The rate of change before and after strengthening the warp of the tempered glass 10 is preferably 40% or less. The amount of warpage of the tempered glass 10 before and after tempering is measured by placing the tempered glass 10 before and after tempering on a horizontal surface plate and measuring the maximum height from the surface plate to the surface of the tempered glass 10. Is possible.
　なお、上記実施形態では、引き出し方向Ｄに沿った方向にガラスリボン３から矩形状のガラス板１を切り出した場合を一例として説明したが、ガラス板１を切り出す方向は任意に定めて良い。例えば、図５に示すように、ガラス板１は、その側辺と引き出し方向Ｄとが任意の角度βだけ傾斜するよう切りだされても良い。このような場合であっても、強化工程でガラス板１の姿勢を傾斜角αが上述範囲内となるよう制御すれば、ガラス板１の反りを抑制することができる。なお、上述図１～４のように側辺が引き出し方向Ｄに沿うように（角度βが０°となるように）ガラス板１を切り出すと、側辺の方向で引き出し方向Ｄを容易に視認できるため、強化工程におけるガラス板１の姿勢の制御が容易となる。さらにガラス板１を長方形であると、側辺と上辺および底辺との区別がつき易く、引き出し方向Ｄを、より視認し易くなり好ましい。 In the above embodiment, the case where the rectangular glass plate 1 is cut out from the glass ribbon 3 in the direction along the drawing direction D has been described as an example, but the direction in which the glass plate 1 is cut out may be arbitrarily determined. For example, as shown in FIG. 5, the glass plate 1 may be cut so that its side and the drawing direction D are inclined by an arbitrary angle β. Even in such a case, warping of the glass plate 1 can be suppressed by controlling the posture of the glass plate 1 in the strengthening step so that the inclination angle α is within the above-mentioned range. When the glass plate 1 is cut out so that the side is along the drawing direction D as shown in FIGS. 1 to 4 (so that the angle β is 0 °), the drawing direction D is easily visually recognized in the direction of the side. Therefore, it becomes easy to control the posture of the glass plate 1 in the strengthening process. Further, it is preferable that the glass plate 1 has a rectangular shape because the side, top and bottom sides can be easily distinguished from each other, and the drawing direction D can be more easily recognized.
　また、上記実施形態では、ガラス板１が矩形板状である場合を例示したが、ガラス板１の形状は上記に限らない。例えば、ガラス板１は楕円形の板状であっても良い。 Moreover, although the case where the glass plate 1 was a rectangular plate shape was illustrated in the said embodiment, the shape of the glass plate 1 is not restricted above. For example, the glass plate 1 may be an elliptical plate shape.
　また、上記実施形態では治具５が、強化槽７と別体的に構成されている場合を例として説明したが、治具５と強化槽７とは一体的に構成されても良い。また、上記治具５の構成は一例であり、ガラス板１の主面を覆うことなく直立姿勢で支持可能であれば任意の構成を採用して良い。例えば、治具５は、ガラス板１の上端部を支持するフレームおよび支持溝部をさらに備えていても良い。また、支持溝部７は、ガラス板１の端辺全体にわたって挟持する長溝であっても良い。 In the above embodiment, the case where the jig 5 is configured separately from the strengthening tank 7 has been described as an example. However, the jig 5 and the strengthening tank 7 may be configured integrally. The configuration of the jig 5 is an example, and any configuration may be adopted as long as the jig 5 can be supported in an upright posture without covering the main surface of the glass plate 1. For example, the jig 5 may further include a frame for supporting the upper end portion of the glass plate 1 and a support groove portion. Further, the support groove portion 7 may be a long groove that is sandwiched over the entire end side of the glass plate 1.
　また、上記板ガラスは成形工程の後、強化工程の前または後に、例えば研磨加工等の所定の加工が施されても良い。 Further, the plate glass may be subjected to a predetermined process such as a polishing process after the molding process, before or after the strengthening process.
　以下、実施例に基づいて、本発明を詳細に説明する。 Hereinafter, the present invention will be described in detail based on examples.
　表１は、本発明の実施例を示している。 Table 1 shows examples of the present invention.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　以下のようにして、各試験を行った。まず、質量％で、ＳｉＯ２　６２％、Ａｌ２Ｏ３　１９．７％、Ｂ２Ｏ３　３．６％、Ｎａ２Ｏ　１３．２％、ＭｇＯ　１．５％を含有するガラス組成になるように、ガラス原料を秤量、混合して、ガラスバッチを作製した。次に、このガラスバッチを溶融窯で溶融した後、オーバーフローダウンドロー法を用いてガラスリボンとして引き出した。そして、得られたガラスリボンを切断し、長さ５００ｍｍ、幅４００ｍｍ、厚さ０．７ｍｍの矩形板状のガラス試料を作製した。なお、試験Ｎｏ．１、３～７のガラス試料は、その側辺と引き出し方向Ｄとが成す角度βが０°となるよう切断し、試験Ｎｏ．２のガラス試料は、角度βが４０°となるよう切断した。 Each test was performed as follows. First, the glass composition contains SiO 2 62%, Al 2 O 3 19.7%, B 2 O 3 3.6%, Na 2 O 13.2%, and MgO 1.5% by mass%. The glass raw material was weighed and mixed to prepare a glass batch. Next, after this glass batch was melted in a melting furnace, it was drawn out as a glass ribbon using an overflow down draw method. And the obtained glass ribbon was cut | disconnected and the glass plate of rectangular plate shape of length 500mm, width 400mm, and thickness 0.7mm was produced. In addition, Test No. The glass samples Nos. 1, 3 to 7 were cut so that the angle β formed between the side and the drawing direction D was 0 °. The glass sample 2 was cut so that the angle β was 40 °.
　上記のようにして得た各ガラス試料について強化前の反り量Ｃ１を測定した。具体的には、各ガラス試料を水平な定盤の上に載置し、定盤からガラス試料の面までの高さを複数箇所について測定し、その最大値を反り量Ｃ１として得た。 The amount of warpage C1 before strengthening was measured for each glass sample obtained as described above. Specifically, each glass sample was placed on a horizontal surface plate, the height from the surface plate to the surface of the glass sample was measured at a plurality of locations, and the maximum value was obtained as the warpage amount C1.
　次いで、各ガラス試料を、化学強化した。具体的には、先ず、ガラス試料を電気炉内に９０分かけて４３０℃に昇温加熱し、４３０℃で３０分間保持して予熱した。その後、予熱した各ガラス試料を表１に記載の傾斜角αとなる姿勢で４３０℃の硝酸カリウムの溶融塩で満たされた強化液槽に１８０分間浸漬した。その後、化学強化されたガラス試料を強化液槽から３００℃の空気雰囲気中に引き揚げ、雰囲気温度が１５０℃になるまで１２０分かけて降温した。 Next, each glass sample was chemically strengthened. Specifically, first, the glass sample was heated up to 430 ° C. over 90 minutes in an electric furnace, and preheated by holding at 430 ° C. for 30 minutes. Thereafter, each preheated glass sample was immersed for 180 minutes in a tempered liquid tank filled with a molten salt of potassium nitrate at 430 ° C. in a posture having an inclination angle α shown in Table 1. Thereafter, the chemically tempered glass sample was drawn from the tempering bath into an air atmosphere at 300 ° C., and the temperature was lowered over 120 minutes until the atmospheric temperature reached 150 ° C.
　上記のようにして得た強化後のガラス試料について、上記強化前の反り量Ｃ１と同様の方法により強化後の反り量Ｃ２を測定した。また、強化前の反り量Ｃ１と強化後の反り量Ｃ２との差分値を反りの変化量として算出した。また、強化前の反り量Ｃ１と反りの変化量との比率を反りの変化率として算出した。 For the tempered glass sample obtained as described above, the warped amount C2 after strengthening was measured by the same method as the warped amount C1 before strengthening. Further, the difference value between the warpage amount C1 before strengthening and the warpage amount C2 after strengthening was calculated as the amount of change in warpage. Further, the ratio between the warpage amount C1 before strengthening and the warpage change amount was calculated as the warpage change rate.
　表１に示すように、傾斜角αが０°に近い程、強化後のガラス試料の反りの変化量および反りの変化率が小さくなる傾向があることが明らかとなった。 As shown in Table 1, it has been clarified that as the inclination angle α is closer to 0 °, the amount of warpage change and the rate of warpage of the glass sample after strengthening tend to be smaller.
　本発明の強化ガラス板およびその製造方法は、タッチパネルディスプレイに用いられるガラス基板およびその製造方法等として有用である。 The tempered glass plate and the method for producing the same of the present invention are useful as a glass substrate used for a touch panel display and a method for producing the same.
１　ガラス板
２　成形装置
３　ガラスリボン
４　切断装置
５　治具
６　フレーム
７　支持溝部
８　強化液
９　強化液槽
１０　強化ガラス板 DESCRIPTION OF SYMBOLS 1 Glass plate 2 Molding device 3 Glass ribbon 4 Cutting device 5 Jig 6 Frame 7 Support groove part 8 Reinforcement liquid 9 Reinforcement liquid tank 10 Reinforced glass plate

Claims (6)

  1.   ガラス板をイオン交換法を用いて処理して強化ガラス板を得る強化ガラス板の製造方法であって、
      溶融ガラスを所定の引き出し方向に引き出すことにより板状に成形して前記ガラス板を得る成形工程と、
    　前記ガラス板を略直立状態で強化液槽に浸漬して強化ガラス板を得る強化工程とを含み、
    　前記強化工程において、前記ガラス板の板面方向の姿勢を前記ガラス板の前記成形時における引き出し方向に応じて定める、強化ガラス板の製造方法。     A method for producing a tempered glass plate, which is obtained by processing a glass plate using an ion exchange method to obtain a tempered glass plate,
    A molding step of obtaining the glass plate by forming a molten glass in a predetermined drawing direction to form a plate; and
    And a tempering step of obtaining a tempered glass plate by immersing the glass plate in a tempered liquid tank in a substantially upright state,
    The manufacturing method of the tempered glass board which determines the attitude | position of the plate | board surface direction of the said glass plate according to the drawing-out direction at the time of the said shaping | molding of the said glass plate in the said reinforcement | strengthening process.
  2.   前記強化工程において、前記ガラス板の前記成形時における引き出し方向が、鉛直方向に対して０°以上４０°未満の範囲内となる姿勢で前記ガラス板を前記強化液槽に浸漬させる、請求項１に記載の強化ガラス板の製造方法。 The said strengthening process WHEREIN: The said glass plate is immersed in the said reinforcement | strengthening liquid tank in the attitude | position in which the drawer direction at the time of the said shaping | molding of the said glass plate is in the range of 0 degree or more and less than 40 degrees with respect to a perpendicular direction. The manufacturing method of the tempered glass board as described in 2.
  3.   前記ガラス板の少なくとも一辺が前記引き出し方向に沿って形成されている、請求項１または２に記載の強化ガラス板の製造方法。 The method for producing a tempered glass sheet according to claim 1 or 2, wherein at least one side of the glass sheet is formed along the pulling direction.
  4.   前記強化工程において、前記ガラス板の両側端部を支持した状態で該ガラス板を前記強化液槽に浸漬する、請求項１から３の何れか１項に記載の強化ガラス板の製造方法。 The method for producing a tempered glass sheet according to any one of claims 1 to 3, wherein in the tempering step, the glass sheet is immersed in the tempered liquid tank in a state where both side ends of the glass sheet are supported.
  5.   前記成形工程において、オーバーフローダウンドロー法を用いて前記ガラス板を成形する、請求項１から４の何れか１項に記載の強化ガラス板の製造方法。 The method for producing a tempered glass sheet according to any one of claims 1 to 4, wherein in the forming step, the glass sheet is formed using an overflow down draw method.
  6.   請求項１から５のいずれかに記載の方法で製造された強化ガラス板であって、定盤に載置して測定した定盤からの高さの前記強化前後の変化率が４０％以下である、強化ガラス板。 A tempered glass sheet produced by the method according to any one of claims 1 to 5, wherein a change rate before and after the tempering of the height from the surface plate measured by placing on the surface plate is 40% or less. There is a tempered glass plate.
PCT/JP2014/073681 2013-11-29 2014-09-08 Reinforced glass sheet and method for manufacturing same WO2015079768A1 (en)

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Citations (5)

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JPS62241845A (en) * 1986-04-10 1987-10-22 Central Glass Co Ltd Method for holding glass plate
JP2003089551A (en) * 2001-09-13 2003-03-28 Matsushita Electric Ind Co Ltd Glass substrate, information recording medium, method for manufacturing glass substrate, and tool for chemical tempering treatment of glass
WO2012099002A1 (en) * 2011-01-18 2012-07-26 日本電気硝子株式会社 Tempered glass, and tempered glass plate
JP2013006749A (en) * 2011-06-27 2013-01-10 Asahi Glass Co Ltd Float glass for chemical strengthening
JP2013177253A (en) * 2010-06-30 2013-09-09 Asahi Glass Co Ltd Method of improving strength of glass substrate for front face plate of display device

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JPS62241845A (en) * 1986-04-10 1987-10-22 Central Glass Co Ltd Method for holding glass plate
JP2003089551A (en) * 2001-09-13 2003-03-28 Matsushita Electric Ind Co Ltd Glass substrate, information recording medium, method for manufacturing glass substrate, and tool for chemical tempering treatment of glass
JP2013177253A (en) * 2010-06-30 2013-09-09 Asahi Glass Co Ltd Method of improving strength of glass substrate for front face plate of display device
WO2012099002A1 (en) * 2011-01-18 2012-07-26 日本電気硝子株式会社 Tempered glass, and tempered glass plate
JP2013006749A (en) * 2011-06-27 2013-01-10 Asahi Glass Co Ltd Float glass for chemical strengthening

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