JP2010215428A - Method and apparatus for manufacturing glass plate - Google Patents

Method and apparatus for manufacturing glass plate Download PDF

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JP2010215428A
JP2010215428A JP2009061290A JP2009061290A JP2010215428A JP 2010215428 A JP2010215428 A JP 2010215428A JP 2009061290 A JP2009061290 A JP 2009061290A JP 2009061290 A JP2009061290 A JP 2009061290A JP 2010215428 A JP2010215428 A JP 2010215428A
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glass plate
glass
forming apparatus
plate forming
ribbon
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JP5005717B2 (en
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Kimihiko Nakajima
公彦 中嶋
Katsuhiko Morisada
勝彦 森定
Hiroyuki Kariya
浩幸 苅谷
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Avanstrate Inc
Avanstrate Taiwan Inc
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Avanstrate Inc
Avanstrate Taiwan Inc
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Priority to TW099106400A priority patent/TWI458689B/en
Priority to SG201001646-7A priority patent/SG165248A1/en
Priority to KR1020100022327A priority patent/KR101740730B1/en
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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
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Glass Compositions (AREA)
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent the occurrence of defects in the shape of an end part of a glass ribbon, with respect to a technology for manufacturing a glass plate by a down draw method. <P>SOLUTION: A glass plate is manufactured by a down draw method comprising: forming a glass ribbon 9 by fusing molten glass at a lower end of a glass plate forming device 4; and transferring the glass ribbon 9 downward along a plurality of rollers 6 arranged at a lower part of the glass plate forming device 4. A heater 8 is provided in a space between the lower end of the glass plate forming device 4 and a roller 6a located in the position closest to the glass plate forming device 4, and forming and transferring of the glass ribbon 9 are carried out while topically heating the end parts of the glass ribbon 9 immediately after being fused with the heater 8. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、ガラス板の製造方法および製造装置に関する。本発明は、特に、ダウンドロー法でガラス板を製造する技術に関する。   The present invention relates to a glass plate manufacturing method and a manufacturing apparatus. The present invention particularly relates to a technique for manufacturing a glass plate by a downdraw method.

ダウンドロー法とは、楔形のガラス板成形装置の上部の溝から溢れた溶融ガラスをガラス板成形装置の側壁に沿って下方へ流し、ガラス板成形装置の下端（ルート）で融合させてガラスリボンを連続的に成形する方法である。ガラスリボンは、ガラス板成形装置の下方に配置されたロールで支持されながら炉内を進み、徐冷され、所望の大きさのガラス板が得られるように切断される。   The down draw method is a glass ribbon in which molten glass overflowing from the upper groove of a wedge-shaped glass plate forming apparatus is flowed downward along the side wall of the glass plate forming apparatus and fused at the lower end (root) of the glass plate forming apparatus. Is a method of continuously molding. The glass ribbon proceeds through the furnace while being supported by a roll disposed below the glass plate forming apparatus, is gradually cooled, and is cut so as to obtain a glass plate of a desired size.

ダウンドロー法は、大面積かつ薄いガラス板、例えばフラットパネルディスプレイ用ガラス基板の製造に適している。例えば、特開２００８−１３３１７４号公報には、極薄のガラス板（例えば０．５ｍｍ以下）を安定して製造する技術が記載されている。具体的には、成形体（ガラス板成形装置）の直下でガラスリボンの板厚を初期厚みまで薄くした後、規制手段（冷却ローラ）の下方に配置した再加熱手段（ヒータ）でそのガラスリボンを軟化点以上の温度まで加熱して軟化させ、軟化したガラスリボンを下方に引き伸ばして板厚をさらに薄くする。   The downdraw method is suitable for manufacturing a large area and thin glass plate, for example, a glass substrate for a flat panel display. For example, Japanese Patent Application Laid-Open No. 2008-133174 describes a technique for stably manufacturing an extremely thin glass plate (for example, 0.5 mm or less). Specifically, after reducing the thickness of the glass ribbon to the initial thickness directly under the molded body (glass plate forming apparatus), the glass ribbon is reheated (heater) disposed below the regulating means (cooling roller). Is heated to a temperature equal to or higher than the softening point and softened, and the softened glass ribbon is stretched downward to further reduce the plate thickness.

また、高品質のガラスリボンを成形するためは、ガラス板成形装置の側壁における溶融ガラスの幅方向の温度管理が重要である。例えば、特開２００７−１１２６６５号公報には、発熱体の配置に粗密が存在する加熱器を成形体（ガラス板成形装置）の側壁に面する位置に設け、これにより、溶融ガラスの幅方向の温度分布を均一化する技術が記載されている。特開２００８−６９０２４号公報には、フュージョンセル（ガラス板成形装置）の表面の白金被膜を通電加熱することによって、溶融ガラスの幅方向の温度分布を均一化する技術が記載されている。   Moreover, in order to shape | mold a high quality glass ribbon, the temperature control of the width direction of the molten glass in the side wall of a glass plate shaping | molding apparatus is important. For example, in Japanese Patent Application Laid-Open No. 2007-112665, a heater in which the heating elements are arranged densely is provided at a position facing the side wall of the molded body (glass plate molding apparatus), and thereby, in the width direction of the molten glass. A technique for homogenizing the temperature distribution is described. Japanese Patent Application Laid-Open No. 2008-69024 describes a technique for making the temperature distribution in the width direction of molten glass uniform by energizing and heating a platinum coating on the surface of a fusion cell (glass plate forming apparatus).

特開２００８−１３３１７４号公報JP 2008-133174 A 特開２００７−１１２６６５号公報JP 2007-112665 A 特開２００８−６９０２４号公報JP 2008-69024 A

ところで、ダウンドロー法で成形したガラスリボンの端部は、通常、図７に示す形をしている。ただし、ガラスリボンの端部が常にこの形をしているとは限らず、二股に分かれた形をしていることもある。二股の形状を有する端部は、ガラスリボンの切断工程を困難にしたり、ガラスリボンの割れの原因になったりする。さらに、二股の形状を有する端部が原因で中央部（製品となる部分）の厚さにバラつきが生じ、歩留まりが低下することもある。   By the way, the end of the glass ribbon formed by the downdraw method is usually in the form shown in FIG. However, the end of the glass ribbon does not always have this shape and may have a bifurcated shape. The end portion having a bifurcated shape makes it difficult to cut the glass ribbon or causes the glass ribbon to break. Furthermore, due to the end portion having a bifurcated shape, the thickness of the central portion (product portion) varies, and the yield may be reduced.

本発明の目的は、ガラスリボンの端部の形状不良を防止することにある。   An object of the present invention is to prevent a defective shape of an end portion of a glass ribbon.

本発明者らは、ガラスリボンの端部の形状不良が発生する原因を詳細に調べた。その結果、融合直後のガラスリボンの粘度が、ガラスリボンの端部の最終形状を決定付ける主な因子である点に着目して、本発明を完成させるに至った。   The present inventors investigated in detail the cause of the shape defect at the end of the glass ribbon. As a result, the present invention has been completed by paying attention to the fact that the viscosity of the glass ribbon immediately after the fusion is the main factor determining the final shape of the end of the glass ribbon.

すなわち、本発明は、
ガラス板成形装置の下端で溶融ガラスを融合させてガラスリボンを成形し、前記ガラス板成形装置の下方に配置した複数のロールに沿って前記ガラスリボンを下方に搬送するダウンドロー法によるガラス板の製造方法であって、
前記ガラス板成形装置の下端と前記ガラス板成形装置から最も近くに位置している前記ロールとの間の空間にヒータを設け、
融合直後の前記ガラスリボンの端部を前記ヒータで局所的に加熱しながら前記ガラスリボンの成形および搬送を実施する、ガラス板の製造方法を提供する。 That is, the present invention
The glass sheet is formed by a downdraw method in which molten glass is fused at the lower end of the glass plate forming apparatus to form a glass ribbon, and the glass ribbon is conveyed downward along a plurality of rolls arranged below the glass plate forming apparatus. A manufacturing method comprising:
A heater is provided in a space between the lower end of the glass plate forming apparatus and the roll located closest to the glass plate forming apparatus,
Provided is a method for producing a glass plate, wherein the glass ribbon is molded and conveyed while locally heating the end of the glass ribbon immediately after the fusion with the heater.

他の側面において、本発明は、
楔形の断面を有するガラス板成形装置と、
前記ガラス板成形装置の下方に配置され、前記ガラス板成形装置の上部の溝から溢れた溶融ガラスが前記ガラス板成形装置の下端で融合することによって成形されたガラスリボンを前記ガラス板成形装置の下方に搬送する複数のロールと、
融合直後の前記ガラスリボンの幅方向の端部を局所的に加熱しうるように、前記ガラス板成形装置の下端と前記ガラス板成形装置から最も近くに位置している前記ロールとの間の空間に設けられたヒータと、
を備えた、ガラス板の製造装置を提供する。 In another aspect, the present invention provides:
A glass plate forming apparatus having a wedge-shaped cross section;
The glass ribbon formed by fusing molten glass overflowing from the upper groove of the glass plate forming apparatus at the lower end of the glass plate forming apparatus is disposed below the glass plate forming apparatus. A plurality of rolls transported downward;
The space between the lower end of the glass plate forming apparatus and the roll located closest to the glass plate forming apparatus so that the end in the width direction of the glass ribbon immediately after fusion can be locally heated. A heater provided in
An apparatus for producing a glass plate, comprising:

融合直後のガラスリボンは、完全には固化しておらず、粘性流体の状態にあるため、周囲の温度の影響を受けやすい。通常は、ガラスリボンの端部がガラスリボンの中央部よりも速く冷却される。端部の温度低下が中央部の温度低下に比べて速すぎると、幅方向に関して粘度のバラつきが大きくなり、端部の形状不良が発生しやすい。   The glass ribbon immediately after the fusion is not completely solidified and is in a viscous fluid state, and thus is easily affected by the ambient temperature. Usually, the edge part of a glass ribbon cools faster than the center part of a glass ribbon. If the temperature drop at the end is too fast compared to the temperature drop at the center, the viscosity varies in the width direction, and the shape of the end tends to be poor.

これに対し、上記本発明によると、融合直後のガラスリボンの端部をヒータで局所的に加熱する。つまり、ガラス板成形装置から離れた直後にガラスリボンの端部だけが急速に冷やされるのを防ぐ。これにより、ガラスリボンの幅方向の温度分布、すなわち粘度分布が均一化し、端部の形状不良が発生しにくくなる。既存の装置を流用して本発明を実施できるので、本発明はコスト面でも優れている。   On the other hand, according to the said invention, the edge part of the glass ribbon immediately after fusion is locally heated with a heater. That is, only the end portion of the glass ribbon is prevented from being rapidly cooled immediately after leaving the glass plate forming apparatus. Thereby, the temperature distribution in the width direction of the glass ribbon, that is, the viscosity distribution is made uniform, and the shape defect of the end portion is less likely to occur. Since the present invention can be implemented by diverting an existing apparatus, the present invention is excellent in terms of cost.

本発明と同じ効果を得るために、ガラス板成形装置の下端近傍における炉内の雰囲気温度を高くすることも考えられる。そのようにすれば、本発明と同じ効果が得られるかもしれない。しかし、本発明はガラスリボンの端部を局所的に加熱すれば十分なので、電力消費の面で相当有利である。また、炉内の雰囲気を高温にすると、各種部品の劣化が速く進み、装置寿命が短くなるので好ましくない。   In order to obtain the same effect as that of the present invention, it is conceivable to increase the atmospheric temperature in the furnace in the vicinity of the lower end of the glass plate forming apparatus. By doing so, the same effect as the present invention may be obtained. However, the present invention is quite advantageous in terms of power consumption because it is sufficient to locally heat the ends of the glass ribbon. Further, it is not preferable to raise the atmosphere in the furnace to a high degree because deterioration of various parts proceeds rapidly and the life of the apparatus is shortened.

なお、「ガラスリボンの端部」とは、例えば、ガラスリボンの側面から内側に約５０ｍｍ進んだ位置までの領域を指す。   In addition, "the edge part of a glass ribbon" refers to the area | region to the position advanced about 50 mm inside from the side surface of the glass ribbon, for example.

本発明の一実施形態にかかるガラス板の製造装置の概略正面図The schematic front view of the manufacturing apparatus of the glass plate concerning one Embodiment of this invention. 図１に示すガラス板の製造装置のII-II線に沿った概略縦断面図1 is a schematic longitudinal sectional view taken along line II-II of the glass plate manufacturing apparatus shown in FIG. ヒータの詳細な位置を示す部分拡大図Partial enlarged view showing the detailed position of the heater ガイドおよびヒータの寸法関係を示す概略図Schematic diagram showing dimensional relationship between guide and heater ヒータの変形例を示す概略図Schematic showing a modification of the heater ガラスリボンとロールとの位置関係を示す概略図Schematic showing the positional relationship between the glass ribbon and roll ガラスリボンの端部の一形状を示す断面図Sectional drawing which shows one shape of the edge part of a glass ribbon

以下、添付の図面を参照して本発明の一実施形態を説明する。   Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

図１および図２に示すように、本実施形態にかかるガラス板の製造装置１００は、炉２と、炉２内の上部に配置されたガラス板成形装置４と、ガラス板成形装置４の下方に配置された複数のロール６と、ガラス板成形装置４の下端４ｅ（ルート）に近接して配置されたヒータ８とを備えている。この装置１００によれば、ガラス板成形装置４から溢れた溶融ガラスを下端４ｅで融合させてガラスリボン９を成形するダウンドロー法によりガラス板を製造できる。   As shown in FIGS. 1 and 2, a glass plate manufacturing apparatus 100 according to the present embodiment includes a furnace 2, a glass plate forming apparatus 4 disposed in an upper part of the furnace 2, and a lower side of the glass plate forming apparatus 4. Are provided with a plurality of rolls 6 and a heater 8 disposed in the vicinity of the lower end 4 e (root) of the glass plate forming apparatus 4. According to this apparatus 100, a glass plate can be manufactured by the down draw method which fuse | melts the molten glass overflowed from the glass plate forming apparatus 4 by the lower end 4e, and shape | molds the glass ribbon 9. FIG.

炉２は、通常、耐火煉瓦で作られている。炉２の内壁には複数のヒータ１０が鉛直方向に沿って配置されている。ヒータ１０は、ガラス板成形装置４の長手方向に平行に延びた長尺の形のものであり、比較的広い範囲を加熱するのに適している。ヒータ１０を制御することによって炉２の内部の温度を調節できる。具体的には、炉２内を下方に進むときにガラスリボン９が徐冷されるように、鉛直方向に沿って温度勾配が形成される。   The furnace 2 is usually made of refractory bricks. A plurality of heaters 10 are arranged on the inner wall of the furnace 2 along the vertical direction. The heater 10 has a long shape extending parallel to the longitudinal direction of the glass plate forming apparatus 4 and is suitable for heating a relatively wide range. The temperature inside the furnace 2 can be adjusted by controlling the heater 10. Specifically, a temperature gradient is formed along the vertical direction so that the glass ribbon 9 is gradually cooled when proceeding downward in the furnace 2.

ガラス板成形装置４は、通常、耐火煉瓦で作られている。図２に示すように、ガラス板成形装置４の長手方向ＬＤに直交する断面において、ガラス板成形装置４は楔形を示す。ガラス板成形装置４の長手方向ＬＤは、ガラスリボン９の幅方向に一致している。ガラス板成形装置４の上部には、溶融ガラスを保持するための溝４ｋが長手方向ＬＤに延びるように形成されている。図１に示すように、長手方向ＬＤの一方側から溝４ｋに溶融ガラスを連続供給できるように、溝４ｋに供給管１１が接続されている。   The glass plate forming apparatus 4 is usually made of refractory bricks. As shown in FIG. 2, in the cross section orthogonal to the longitudinal direction LD of the glass plate forming apparatus 4, the glass plate forming apparatus 4 has a wedge shape. The longitudinal direction LD of the glass plate forming apparatus 4 coincides with the width direction of the glass ribbon 9. A groove 4k for holding molten glass is formed in the upper part of the glass plate forming apparatus 4 so as to extend in the longitudinal direction LD. As shown in FIG. 1, a supply pipe 11 is connected to the groove 4k so that molten glass can be continuously supplied to the groove 4k from one side in the longitudinal direction LD.

図２に示すように、ガラス板成形装置４は、長手方向ＬＤおよび鉛直方向に直交する方向に関して、１対の側壁４ｊを有している。側壁４ｊは、溝４ｋから溢れた溶融ガラスの流路を形成する。各側壁４ｊを流れた溶融ガラスが下端４ｅで融合するように、これらの側壁４ｊが下端４ｅで稜線を形成している。図１に示すように、ガラス板成形装置４の長手方向ＬＤの両端には、側壁４ｊから溶融ガラスがはみ出るのを妨げるガイド７が取り付けられている。図４に示すように、ガイド７は、平面視で楔形をしており、ガラス板成形装置４の端面全体をカバーできる大きさの板材で作られている。鉛直方向に関して、ガイドの７の先端の位置は、ガラス板成形装置４の下端４ｅに一致している。ガイド７の働きにより、溶融ガラスの全部を側壁４ｊに沿って流すことが可能である。   As shown in FIG. 2, the glass plate forming apparatus 4 has a pair of side walls 4j in the direction perpendicular to the longitudinal direction LD and the vertical direction. The side wall 4j forms a flow path of molten glass overflowing from the groove 4k. These side walls 4j form a ridge line at the lower end 4e so that the molten glass flowing through each side wall 4j is fused at the lower end 4e. As shown in FIG. 1, guides 7 that prevent the molten glass from protruding from the side walls 4j are attached to both ends of the glass plate forming apparatus 4 in the longitudinal direction LD. As shown in FIG. 4, the guide 7 has a wedge shape in a plan view, and is made of a plate material having a size that can cover the entire end surface of the glass plate forming apparatus 4. With respect to the vertical direction, the position of the tip of the guide 7 coincides with the lower end 4 e of the glass plate forming apparatus 4. By the action of the guide 7, it is possible to flow all of the molten glass along the side wall 4j.

ロール６は、ガラスリボン９をガラス板成形装置４の下方に搬送する役割を担う。所期の厚さのガラスリボン９が成形されるように、ロール６の回転速度が調節される。図２に示すように、ガラスリボン９を厚さ方向に挟めるように、ロール６は、ガラス板成形装置４の下端４ｅを含む垂直面に関して対称に配置されている。また、ロール６は、鉛直方向に所定間隔で配置されている。ガラスリボン９は、これらのロール６に挟まれた状態で下方に搬送される。   The roll 6 plays a role of conveying the glass ribbon 9 below the glass plate forming apparatus 4. The rotation speed of the roll 6 is adjusted so that the glass ribbon 9 having a desired thickness is formed. As shown in FIG. 2, the roll 6 is disposed symmetrically with respect to the vertical plane including the lower end 4 e of the glass plate forming apparatus 4 so as to sandwich the glass ribbon 9 in the thickness direction. The rolls 6 are arranged at predetermined intervals in the vertical direction. The glass ribbon 9 is conveyed downward while being sandwiched between these rolls 6.

図１に示すように、ヒータ８は、ガラス板成形装置４の長手方向ＬＤの一方側と他方側とに設けられている。具体的に、ヒータ８は、鉛直方向に関してガラス板成形装置４の下端４ｅとガラス板成形装置４から最も近くに位置しているロール６ａとの間の空間に設けられている。融合直後のガラスリボン９の幅方向の端部をヒータ８で局所的に加熱することにより、融合直後のガラスリボン９の端部の粘度が中央部の粘度に比べて高くなりすぎるのを防止する。言い換えれば、ガラスリボン９の幅方向に関する粘度のバラつきが低減する。結果として、ガラスリボン９の端部の形状不良を防げる。さらに、ガラスの失透も防止される。   As shown in FIG. 1, the heaters 8 are provided on one side and the other side in the longitudinal direction LD of the glass plate forming apparatus 4. Specifically, the heater 8 is provided in a space between the lower end 4e of the glass plate forming device 4 and the roll 6a located closest to the glass plate forming device 4 in the vertical direction. By locally heating the end portion in the width direction of the glass ribbon 9 immediately after the fusion with the heater 8, the viscosity of the end portion of the glass ribbon 9 immediately after the fusion is prevented from becoming too high compared to the viscosity at the center portion. . In other words, the viscosity variation in the width direction of the glass ribbon 9 is reduced. As a result, the shape defect of the edge part of the glass ribbon 9 can be prevented. Furthermore, devitrification of the glass is also prevented.

よく知られているように、失透とは、ガラス中に結晶粒が形成されて、ガラスの透明性が低下する現象のことである。ダウンドロー法でガラス板を製造する場合には、ガラスリボン９の端部に失透が発生しやすい。その理由は必ずしも明らかではないが、ガイド７の近傍で溶融ガラスの流速が落ち、失透の生じやすい温度域に溶融ガラスが長く保持されることが一つの原因であると考えられる。   As is well known, devitrification is a phenomenon in which crystal grains are formed in glass and the transparency of the glass is lowered. When a glass plate is manufactured by the down draw method, devitrification tends to occur at the end of the glass ribbon 9. The reason is not necessarily clear, but it is thought that one reason is that the molten glass flow rate decreases in the vicinity of the guide 7 and the molten glass is held for a long time in a temperature range where devitrification is likely to occur.

ガイド７の近傍にヒータ８を配置すると、ガラスリボン９の端部だけでなく、ガイド７もヒータ８で加熱される。ガイド７の熱がガイド７の近傍の溶融ガラスに伝わり、ガイド７の近傍の溶融ガラスだけが失透の生じやすい温度域に長く保持されるのを防止できる。特に、溶融ガラスが清澄剤としてスズを含む場合には、酸化スズがガラス中に晶出して失透が生じやすい。そのため、溶融ガラスがスズを含む場合には、本発明がとりわけ推奨される。   When the heater 8 is disposed in the vicinity of the guide 7, not only the end portion of the glass ribbon 9 but also the guide 7 is heated by the heater 8. It is possible to prevent the heat of the guide 7 from being transmitted to the molten glass in the vicinity of the guide 7 and to keep only the molten glass in the vicinity of the guide 7 for a long time in a temperature range where devitrification easily occurs. In particular, when the molten glass contains tin as a fining agent, tin oxide is crystallized in the glass and devitrification is likely to occur. Therefore, the present invention is particularly recommended when the molten glass contains tin.

本実施形態において、ヒータ８は、ガラス板成形装置４、ガイド７および炉２のいずれにも接していない。ヒータ８の位置は、融合直後のガラスリボン９の端部を効果的に加熱できるように調節されている。図３を参照してヒータ８の詳細な位置を説明する。ヒータ８は、ガラス板成形装置４の長手方向ＬＤの両端に取り付けられたガイド７よりも外側かつガラスリボン９の側面９ｐが面している空間に設けられている。より詳細には、鉛直方向に関して、ガラス板成形装置４の下端４ｅと、ガラスリボン９の幅が漸減して一定になる位置Ｐ1との間の空間にヒータ８が設けられている。 In the present embodiment, the heater 8 is not in contact with any of the glass plate forming apparatus 4, the guide 7 and the furnace 2. The position of the heater 8 is adjusted so that the end of the glass ribbon 9 immediately after the fusion can be effectively heated. The detailed position of the heater 8 will be described with reference to FIG. The heater 8 is provided in a space outside the guides 7 attached to both ends in the longitudinal direction LD of the glass plate forming apparatus 4 and facing the side surface 9p of the glass ribbon 9. More specifically, the heater 8 is provided in a space between the lower end 4e of the glass plate forming device 4 and the position P 1 where the width of the glass ribbon 9 gradually decreases and becomes constant with respect to the vertical direction.

図３に示すように、成形時において、ガラスリボン９の幅はガラス板成形装置４の下端４ｅから位置Ｐ1まで漸減する。すなわち、側面９ｐが緩やかにカーブする。ヒータ８は、側面９ｐのカーブした部分に面している。このような位置にヒータ８を設けることにより、融合直後のガラスリボン９の端部を効率よく加熱できる。なお、ヒータ８の出力や寸法等にもよるが、ガラス板成形装置４の下端４ｅ（ガイド７の下端）からヒータ８までの鉛直方向の距離Ｈ1は、例えば０〜５００ｍｍであり、好ましくは０〜１００ｍｍである。ガイド７の内壁面７ｇからヒータ８までの水平方向の距離Ｌ1は、例えば−１０〜１００ｍｍであり、好ましくは０〜１００ｍｍであり、さらに好ましくは０〜３０ｍｍである。ただし、ヒータ８がガラスリボン９に接触しないように留意するべきである。なお、距離Ｌ1が−１０ｍｍ以上０ｍｍ未満の場合には、ガイド７の内壁面７ｇを基準として、ヒータ８の一部または全部がガラスリボン９のある側に存在することになる。 As shown in FIG. 3, at the time of molding, the width of the glass ribbon 9 gradually decreases from the lower end 4e of the glass plate forming device 4 to the position P 1. That is, the side surface 9p curves gently. The heater 8 faces the curved portion of the side surface 9p. By providing the heater 8 at such a position, the end of the glass ribbon 9 immediately after the fusion can be efficiently heated. Incidentally, although depending on the output and dimensions of the heater 8 or the like, the vertical distance H 1 from the glass plate forming device 4 at the lower end 4e (the lower end of the guide 7) until the heater 8, for example, a 0-500 mM, preferably 0 to 100 mm. The horizontal distance L 1 from the inner wall surface 7g of the guide 7 to the heater 8 is, for example, −10 to 100 mm, preferably 0 to 100 mm, and more preferably 0 to 30 mm. However, care should be taken that the heater 8 does not contact the glass ribbon 9. When the distance L 1 is −10 mm or more and less than 0 mm, a part or all of the heater 8 is present on the side where the glass ribbon 9 is present with reference to the inner wall surface 7 g of the guide 7.

図２に示すように、ヒータ８は、ガラス板成形装置４の長手方向ＬＤおよび鉛直方向の双方に直交する水平方向、つまり、ガラスリボン９の厚さ方向に延びている。図４に示すように、ガラスリボン９の厚さ方向に関するヒータ８の寸法Ｗ1は、当該方向に関するガラス板成形装置４の寸法Ｗ2やガイド７の寸法Ｗ3よりも大きい。このような構成によると、ガラスリボン９の表面側と裏面側との両側から端部を均一に加熱できるので、より効果的に形状不良を防止できる。また、ヒータ８が十分な寸法Ｗ1を有していることにより、ガイド７の下部も十分加熱できるので、失透の防止効果も高まる。 As shown in FIG. 2, the heater 8 extends in the horizontal direction perpendicular to both the longitudinal direction LD and the vertical direction of the glass plate forming apparatus 4, that is, in the thickness direction of the glass ribbon 9. As shown in FIG. 4, the dimension W 1 of the heater 8 in the thickness direction of the glass ribbon 9 is larger than the dimension W 2 of the glass plate forming apparatus 4 and the dimension W 3 of the guide 7 in the direction. According to such a structure, since an edge part can be uniformly heated from the both sides of the surface side and the back surface side of the glass ribbon 9, a shape defect can be prevented more effectively. Further, since the heater 8 has a sufficient dimension W 1 , the lower portion of the guide 7 can be sufficiently heated, so that the effect of preventing devitrification is enhanced.

ヒータ８の通電（設定温度）は、ガラスの組成、ヒータ８からガラスリボン９までの距離等を考慮して適宜制御される。例えば、フラットパネルディスプレイ用のガラス板の組成では、ヒータ８の設定温度を８００〜１３００℃の範囲で任意に調節できる。   The energization (set temperature) of the heater 8 is appropriately controlled in consideration of the glass composition, the distance from the heater 8 to the glass ribbon 9, and the like. For example, in the composition of the glass plate for flat panel displays, the set temperature of the heater 8 can be arbitrarily adjusted in the range of 800 to 1300 ° C.

また、図４に示すように、ガラス板成形装置４の側壁４ｊでの溶融ガラスの温度を検出する温度センサ１２と、温度センサ１２からの信号を取得する制御器１４とを設けてもよい。温度センサ１２は、例えばガイド７の下部に取り付けられており、溶融ガラスの温度を間接に検出する。温度センサ１２としては、例えば熱電対を使用できる。制御器１４は、温度センサ１２の検出結果に基づいてヒータ８への通電を制御する。例えば、温度センサ１２によって検出された温度とヒータ８の設定温度とを等しくする。このようにすれば、ガラスの組成によらずヒータ８を適切に制御でき、ガラスリボン９の端部の形状不良を確実に防げる。   Moreover, as shown in FIG. 4, you may provide the temperature sensor 12 which detects the temperature of the molten glass in the side wall 4j of the glass plate forming apparatus 4, and the controller 14 which acquires the signal from the temperature sensor 12. As shown in FIG. The temperature sensor 12 is attached to the lower part of the guide 7, for example, and indirectly detects the temperature of the molten glass. For example, a thermocouple can be used as the temperature sensor 12. The controller 14 controls energization to the heater 8 based on the detection result of the temperature sensor 12. For example, the temperature detected by the temperature sensor 12 and the set temperature of the heater 8 are made equal. In this way, the heater 8 can be appropriately controlled regardless of the glass composition, and the defective shape of the end of the glass ribbon 9 can be reliably prevented.

なお、温度センサ１２の検出結果に基づいて、マニュアルでヒータ８の出力を調節してもよい。また、ガラス板成形装置４の下端４ｅにおける溶融ガラスの幅方向の中央部の温度を検出する場合には、温度センサ１２として非接触式の赤外線センサを使用できる。   Note that the output of the heater 8 may be manually adjusted based on the detection result of the temperature sensor 12. Moreover, when detecting the temperature of the center part of the width direction of the molten glass in the lower end 4e of the glass plate forming apparatus 4, a non-contact type infrared sensor can be used as the temperature sensor 12.

ヒータ８としては、１０００℃を超える雰囲気温度でも使用できるものであれば、特に限定されない。具体的には、ヒータ８として、線状発熱体や線状発熱体をコイル状にしたものを使用できる。さらに、セラミックヒータ、ハロゲンヒータ、炭化ケイ素発熱体等の放射型のヒータも使用可能である。ヒータ８の形状も特に限定されず、図１〜４に示すような棒状であってもよいし、図５に示すようなＵ字状であってもよい。先に説明したように、ガラスリボン９の端部の幅は５０ｍｍ程度なので、局所加熱を行うためには図１〜４に示す形状のヒータ８で必要十分である。また、ヒータ８の占有スペースをわざわざ確保する必要もない。他方、図５に示すＵ字状のヒータ１８によると、ガラスリボン９の端部９ｔを３方向からヒータ１８で囲んで加熱可能である。   The heater 8 is not particularly limited as long as it can be used even at an atmospheric temperature exceeding 1000 ° C. Specifically, as the heater 8, a linear heating element or a linear heating element in a coil shape can be used. Further, a radial heater such as a ceramic heater, a halogen heater, or a silicon carbide heating element can be used. The shape of the heater 8 is not particularly limited, and may be a rod shape as shown in FIGS. 1 to 4 or a U shape as shown in FIG. 5. As described above, since the width of the end portion of the glass ribbon 9 is about 50 mm, the heater 8 having the shape shown in FIGS. Further, it is not necessary to secure the space occupied by the heater 8. On the other hand, according to the U-shaped heater 18 shown in FIG. 5, the end 9t of the glass ribbon 9 can be surrounded by the heater 18 from three directions and heated.

本実施形態によると、ヒータ８によってガラスリボン９の端部が加熱されるため、ガラスリボン９の端部はロール６ａに到達するまで、粘性流体の性質をより強く保っている。そのため、図６に示すように、端部９ｔをロール６ａで挟んでガラスリボン９を搬送できる。言い換えれば、ロール６ａは端部９ｔを挟む位置に配置されている。ガラスリボン９の幅方向に関して、ロール６ａはガラスリボン９の側面を横切っている。他方、ロール６ａよりも下にある他のロール６は、端部９ｔを挟んでおらず、端部９ｔよりも内側の部分を挟んでいる。   According to the present embodiment, since the end of the glass ribbon 9 is heated by the heater 8, the end of the glass ribbon 9 keeps the property of the viscous fluid stronger until it reaches the roll 6a. Therefore, as shown in FIG. 6, the glass ribbon 9 can be conveyed with the end 9t sandwiched between rolls 6a. In other words, the roll 6a is disposed at a position sandwiching the end 9t. With respect to the width direction of the glass ribbon 9, the roll 6 a crosses the side surface of the glass ribbon 9. On the other hand, the other rolls 6 below the roll 6a do not sandwich the end portion 9t, but sandwich the portion inside the end portion 9t.

例えば、特開２００８−１３３１７４号公報の図２に示されているように、全てのロールがガラスリボンの端部を挟まないように、それらのロールの位置を定めることも可能である。端部の粘度が高い場合には、安定した搬送を実施する観点やガラスリボンの割れを防ぐ観点から、端部をロールで挟むのを避けた方が賢明である。   For example, as shown in FIG. 2 of Japanese Patent Application Laid-Open No. 2008-133174, the positions of these rolls can be determined so that all the rolls do not sandwich the end portion of the glass ribbon. When the viscosity of the end is high, it is wise to avoid pinching the end with a roll from the viewpoint of carrying out stable conveyance and preventing the glass ribbon from cracking.

これに対し、本実施形態によれば、融合直後における端部９ｔの粘度の上昇が抑制されているので、端部９ｔをロール６ａで挟んでガラスリボン９を搬送できる。また、ガラスリボン９が十分に硬化する前であれば、図６に示すように、端部９ｔがある程度平坦になるように、ロール６ａで端部９ｔに圧力を加えることも可能である。端部９ｔが平坦な場合、ガラスリボン９を切断する工程が容易化する。ロール６ａよりも下にある他のロール６で端部９ｔを挟むことも可能であるが、ガラス板成形装置４から最も近い位置にあるロール６ａで端部９ｔを挟めば、端部９ｔを平坦化する効果が最も高くなる。そして、他のロール６で端部９ｔよりも内側の部分を挟めば、ガラスリボン９の割れ等の不具合を招くことなく、安定した搬送を実現できる。このように、本実施形態によれば、端部９ｔの形状を整える効果とガラスリボン９を安定して搬送する効果との両方を享受できる。   On the other hand, according to this embodiment, since the increase in the viscosity of the end portion 9t immediately after the fusion is suppressed, the glass ribbon 9 can be conveyed with the end portion 9t sandwiched between the rolls 6a. Further, before the glass ribbon 9 is sufficiently cured, as shown in FIG. 6, it is also possible to apply pressure to the end portion 9t with the roll 6a so that the end portion 9t becomes flat to some extent. When the end 9t is flat, the process of cutting the glass ribbon 9 is facilitated. Although it is possible to sandwich the end portion 9t with another roll 6 below the roll 6a, if the end portion 9t is sandwiched with the roll 6a located closest to the glass plate forming apparatus 4, the end portion 9t is flattened. The effect to become the highest. And if the part inside the edge part 9t is pinched | interposed with the other roll 6, stable conveyance can be implement | achieved, without causing malfunctions, such as a crack of the glass ribbon 9. FIG. Thus, according to this embodiment, both the effect of adjusting the shape of the end portion 9t and the effect of stably transporting the glass ribbon 9 can be enjoyed.

ガラス板の製造装置１００の作用を簡単に説明する。ガラス板成形装置４の溝４ｋに供給された溶融ガラスの量が一定量を超えると、溶融ガラスは溝４ｋから溢れて側壁４ｊに沿って下に流れる。側壁４ｊでの溶融ガラスは、粘性を保つために、ガラス板成形装置４の周囲に配置されたヒータ１０で加熱されている。各側壁４ｊを流れた溶融ガラスが下端４ｅで融合し、これにより、ガラスリボン９が成形される。ガラスリボン９は、互いに向かい合うロール６とロール６との間に案内され、徐冷されながら下方に搬送される。ガラスリボン９の温度は下方に進むにつれて低くなり、これに伴ってガラスリボン９の固化が進む。炉２外に搬送したガラスリボン９を所期の大きさに切断すれば、ガラス板が得られる。   The operation of the glass plate manufacturing apparatus 100 will be briefly described. When the amount of molten glass supplied to the groove 4k of the glass plate forming apparatus 4 exceeds a certain amount, the molten glass overflows from the groove 4k and flows downward along the side wall 4j. The molten glass on the side wall 4j is heated by a heater 10 disposed around the glass plate forming apparatus 4 in order to maintain viscosity. The molten glass flowing through each side wall 4j is fused at the lower end 4e, whereby a glass ribbon 9 is formed. The glass ribbon 9 is guided between the roll 6 and the roll 6 facing each other, and is conveyed downward while being gradually cooled. The temperature of the glass ribbon 9 becomes lower as it goes downward, and the solidification of the glass ribbon 9 proceeds accordingly. If the glass ribbon 9 conveyed outside the furnace 2 is cut into a desired size, a glass plate is obtained.

本実施形態によれば、ヒータ８によってガラスリボン９の端部９ｔが加熱されるため、ロール６ａの近傍におけるガラスリボン９の端部９ｔの粘度が中央部の粘度に比べて高くなりすぎるのを防止できる。ガラスリボン９がガラス転移点の温度域まで冷却されて固化するのは、炉２内の中間付近が一応の目安である。   According to this embodiment, since the end portion 9t of the glass ribbon 9 is heated by the heater 8, the viscosity of the end portion 9t of the glass ribbon 9 in the vicinity of the roll 6a is too high compared to the viscosity of the central portion. Can be prevented. The glass ribbon 9 is cooled to the temperature range of the glass transition point and solidifies in the middle of the furnace 2 as a guide.

ガラス板成形装置４の下端４ｅでの溶融ガラスの粘度は、ガラスの組成や製造条件に応じて変化する。例えば、フラットパネルディスプレイ用のガラス板を製造する場合、下端４ｅでの溶融ガラスの粘度は、１００００〜６００００Ｐａ・ｓの範囲に調節される。溶融ガラスの粘度は、溶融ガラスの温度で管理される。溶融ガラスの温度を８００〜１０００℃の範囲に調節すれば、溶融ガラスの粘度が上記範囲に収まる。具体的には、溶融ガラスの温度が下端４ｅで８００〜１０００℃になるように、ヒータ１０を制御して炉２内の雰囲気温度を調節する。   The viscosity of the molten glass at the lower end 4e of the glass plate forming apparatus 4 varies depending on the glass composition and production conditions. For example, when manufacturing the glass plate for flat panel displays, the viscosity of the molten glass in the lower end 4e is adjusted to the range of 10000-60000 Pa.s. The viscosity of the molten glass is controlled by the temperature of the molten glass. If the temperature of a molten glass is adjusted to the range of 800-1000 degreeC, the viscosity of a molten glass will be settled in the said range. Specifically, the atmospheric temperature in the furnace 2 is adjusted by controlling the heater 10 so that the temperature of the molten glass becomes 800 to 1000 ° C. at the lower end 4e.

特に近年は、大面積のガラス板の需要が増大しつつある。例えば、第１０世代の液晶ディスプレイ用ガラス基板の寸法は、２８５０ｍｍ×３０５０ｍｍである。ガラスリボンの幅が広くなればなるほど、幅方向の粘度のバラつきが生じやすいので、本発明を適用して得られる効果も高まる。なお、フラットパネルディスプレイ用ガラス基板の典型的なガラス組成を以下に示す。   Particularly in recent years, the demand for large-area glass plates is increasing. For example, the size of the glass substrate for 10th generation liquid crystal display is 2850 mm × 3050 mm. As the width of the glass ribbon becomes wider, the viscosity in the width direction tends to vary, so the effect obtained by applying the present invention increases. In addition, the typical glass composition of the glass substrate for flat panel displays is shown below.

ＳｉＯ2：５７〜７０質量％
Ａｌ2Ｏ3：１３〜１９質量％
Ｂ2Ｏ3：８〜１３質量％
ＭｇＯ：０〜２質量％
ＣａＯ：４〜６質量％
ＳｒＯ：２〜４質量％
ＢａＯ：０〜２質量％
Ｎａ2Ｏ：０〜１質量％
Ｋ2Ｏ：０〜１質量％
Ａｓ2Ｏ3：０〜１質量％
Ｓｂ2Ｏ3：０〜１質量％
ＳｎＯ2：０〜１質量％
Ｆｅ2Ｏ3：０〜１質量％
ＺｒＯ2：０〜１質量％ SiO 2: 57~70 mass%
Al 2 O 3 : 13 to 19% by mass
B 2 O 3 : 8 to 13% by mass
MgO: 0 to 2% by mass
CaO: 4 to 6% by mass
SrO: 2 to 4% by mass
BaO: 0 to 2% by mass
Na 2 O: 0 to 1% by mass
K 2 O: 0 to 1% by mass
As 2 O 3 : 0 to 1% by mass
Sb 2 O 3 : 0 to 1% by mass
SnO 2 : 0 to 1% by mass
Fe 2 O 3 : 0 to 1% by mass
ZrO 2 : 0 to 1% by mass

耐火煉瓦製の溶解槽と白金製の調整槽（清澄工程を実施する槽）とを備えた連続溶解装置を使用して、下記の組成を有するように調合したガラス原料を１５５０℃で溶解し、１６００℃で清澄し、１５５０℃で撹拌して溶融ガラスを得た。なお、合計質量が１００を超えるのは、四捨五入による誤差が含まれているからである。   Using a continuous melting apparatus equipped with a refractory brick melting tank and a platinum adjustment tank (tank for carrying out the refining process), the glass raw material prepared to have the following composition was melted at 1550 ° C., The glass was clarified at 1600 ° C. and stirred at 1550 ° C. to obtain a molten glass. The total mass exceeds 100 because an error due to rounding is included.

ＳｉＯ2：６０．９質量％、
Ａｌ2Ｏ3：１６．９質量％
Ｂ2Ｏ3：１１．６質量％
ＭｇＯ：１．７質量％
ＣａＯ：５．１質量％
ＳｒＯ：２．６質量％
ＢａＯ：０．７質量％
Ｋ2Ｏ：０．２５質量％
Ｆｅ2Ｏ3：０．１５質量％
ＳｎＯ2：０．１３質量％ SiO 2 : 60.9% by mass,
Al 2 O 3 : 16.9% by mass
B 2 O 3 : 11.6% by mass
MgO: 1.7% by mass
CaO: 5.1 mass%
SrO: 2.6% by mass
BaO: 0.7 mass%
K 2 O: 0.25% by mass
Fe 2 O 3 : 0.15% by mass
SnO 2 : 0.13 mass%

次に、図１を参照して説明したガラス板の製造装置１００に溶融ガラスを供給した。ヒータ８の設定温度を１１１０℃とした。ガラス板成形装置４に流し込まれた溶融ガラスの粘度は、その溶融ガラスの温度が１２００℃であったことから、約５０００Ｐａ・ｓに相当すると推察できる。   Next, the molten glass was supplied to the glass plate manufacturing apparatus 100 described with reference to FIG. The set temperature of the heater 8 was set to 1110 ° C. It can be inferred that the viscosity of the molten glass poured into the glass plate forming apparatus 4 corresponds to about 5000 Pa · s since the temperature of the molten glass was 1200 ° C.

溶融ガラスを供給し続け、ガラス板成形装置４から溶融ガラスを溢れさせてガラスリボンを成形した。ガラスリボンを所定の大きさに切断して多数のガラス板を得た。これらのガラス板の端部の形状を調べたところ、二股に開いたものは無かった。また、これらのガラス板には、明らかな失透も発生していなかった。なお、成形時に高粘度になりやすい別の組成の溶融ガラスを使用して、同じ手順でガラスリボンを成形した。その結果、良好な形状の端部を有するガラス板が得られた。   The molten glass was continuously supplied, and the molten glass overflowed from the glass plate forming apparatus 4 to form a glass ribbon. The glass ribbon was cut into a predetermined size to obtain a number of glass plates. When the shape of the edge part of these glass plates was investigated, there was no thing opened to the fork. In addition, no obvious devitrification occurred in these glass plates. In addition, the glass ribbon was shape | molded in the same procedure using the molten glass of another composition which becomes high viscosity easily at the time of shaping | molding. As a result, a glass plate having an end with a good shape was obtained.

２ 炉
４ ガラス板成形装置
４ｅ 下端（ルート）
４ｊ 側壁
６，６ａ ロール
７ ガイド
８ ヒータ
９ ガラスリボン
９ｔ 端部
１２ 温度センサ
１４ 制御器
１００ ガラス板の製造装置 2 Furnace 4 Glass plate forming device 4e Lower end (root)
4j Side wall 6, 6a Roll 7 Guide 8 Heater 9 Glass ribbon 9t End 12 Temperature sensor 14 Controller 100 Glass plate manufacturing apparatus

Claims (10)

ガラス板成形装置の下端で溶融ガラスを融合させてガラスリボンを成形し、前記ガラス板成形装置の下方に配置した複数のロールに沿って前記ガラスリボンを下方に搬送するダウンドロー法によるガラス板の製造方法であって、
前記ガラス板成形装置の下端と前記ガラス板成形装置から最も近くに位置している前記ロールとの間の空間にヒータを設け、
融合直後の前記ガラスリボンの端部を前記ヒータで局所的に加熱しながら前記ガラスリボンの成形および搬送を実施する、ガラス板の製造方法。 The glass sheet is formed by a downdraw method in which molten glass is fused at the lower end of the glass plate forming apparatus to form a glass ribbon, and the glass ribbon is conveyed downward along a plurality of rolls arranged below the glass plate forming apparatus. A manufacturing method comprising:
A heater is provided in a space between the lower end of the glass plate forming apparatus and the roll located closest to the glass plate forming apparatus,
The manufacturing method of the glass plate which implements shaping | molding and conveyance of the said glass ribbon, heating the edge part of the said glass ribbon just after fusion | melting locally with the said heater. 前記空間が、前記ガラス板成形装置の長手方向の両端に取り付けられたガイドよりも外側かつ前記ガラスリボンの側面が面している空間である、請求項１に記載のガラス板の製造方法。   The manufacturing method of the glass plate of Claim 1 which is the space where the said space is outside the guide attached to the both ends of the longitudinal direction of the said glass plate forming apparatus, and the side surface of the said glass ribbon faces. 前記空間が、前記ガラス板成形装置の下端と前記ガラスリボンの幅が漸減して一定になる位置との間の空間である、請求項１または２に記載のガラス板の製造方法。   The manufacturing method of the glass plate of Claim 1 or 2 whose said space is a space between the lower end of the said glass plate forming apparatus, and the position where the width | variety of the said glass ribbon reduces gradually and becomes constant. 前記ガラス板成形装置から最も近くに位置している前記ロールで前記ガラスリボンの端部を挟む、請求項１〜３のいずれか１項に記載のガラス板の製造方法。   The manufacturing method of the glass plate of any one of Claims 1-3 which pinches | interposes the edge part of the said glass ribbon with the said roll located closest to the said glass plate forming apparatus. 前記溶融ガラスがスズを含む、請求項１〜４のいずれか１項に記載のガラス板の製造方法。   The manufacturing method of the glass plate of any one of Claims 1-4 with which the said molten glass contains tin. 楔形の断面を有するガラス板成形装置と、
前記ガラス板成形装置の下方に配置され、前記ガラス板成形装置の上部の溝から溢れた溶融ガラスが前記ガラス板成形装置の下端で融合することによって成形されたガラスリボンを前記ガラス板成形装置の下方に搬送する複数のロールと、
融合直後の前記ガラスリボンの幅方向の端部を局所的に加熱しうるように、前記ガラス板成形装置の下端と前記ガラス板成形装置から最も近くに位置している前記ロールとの間の空間に設けられたヒータと、
を備えた、ガラス板の製造装置。 A glass plate forming apparatus having a wedge-shaped cross section;
The glass ribbon formed by fusing molten glass overflowing from the upper groove of the glass plate forming apparatus at the lower end of the glass plate forming apparatus is disposed below the glass plate forming apparatus. A plurality of rolls transported downward;
The space between the lower end of the glass plate forming apparatus and the roll located closest to the glass plate forming apparatus so that the end in the width direction of the glass ribbon immediately after fusion can be locally heated. A heater provided in
An apparatus for producing a glass plate, comprising: 前記ガラス板成形装置の長手方向の端には、前記ガラス板成形装置の側壁から前記溶融ガラスがはみ出るのを妨げるガイドが取り付けられており、
前記空間が、前記ガイドよりも外側かつ前記ガラスリボンの側面が面している空間である、請求項６に記載のガラス板の製造装置。 A guide that prevents the molten glass from protruding from the side wall of the glass plate forming apparatus is attached to an end in the longitudinal direction of the glass plate forming apparatus,
The glass plate manufacturing apparatus according to claim 6, wherein the space is a space outside the guide and facing a side surface of the glass ribbon. 前記ガラス板成形装置の長手方向および鉛直方向に直交する方向に関する前記ヒータの寸法が、当該方向に関する前記ガラス板成形装置の寸法よりも大きい、請求項６または７に記載のガラス板の製造装置。   The glass plate manufacturing apparatus according to claim 6 or 7, wherein a dimension of the heater with respect to a direction orthogonal to a longitudinal direction and a vertical direction of the glass sheet forming apparatus is larger than a dimension of the glass plate forming apparatus with respect to the direction. 前記ガラス板成形装置から最も近くに位置している前記ロールが、前記ガラスリボンの端部を挟む位置に配置されている、請求項６〜８のいずれか１項に記載のガラス板の製造装置。   The apparatus for manufacturing a glass plate according to any one of claims 6 to 8, wherein the roll located closest to the glass plate forming apparatus is disposed at a position sandwiching an end of the glass ribbon. . 前記ガラス板成形装置の側壁での前記溶融ガラスの温度を検出する温度センサと、
前記温度センサの検出結果に基づいて前記ヒータへの通電を制御する制御器と、
をさらに備えた、請求項６〜９のいずれか１項に記載のガラス板の製造装置。 A temperature sensor for detecting the temperature of the molten glass at the side wall of the glass plate forming apparatus;
A controller for controlling energization to the heater based on the detection result of the temperature sensor;
The apparatus for manufacturing a glass plate according to any one of claims 6 to 9, further comprising:
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