JP5405526B2 - Sheet glass manufacturing method and glass forming apparatus - Google Patents

Sheet glass manufacturing method and glass forming apparatus Download PDF

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JP5405526B2
JP5405526B2 JP2011129347A JP2011129347A JP5405526B2 JP 5405526 B2 JP5405526 B2 JP 5405526B2 JP 2011129347 A JP2011129347 A JP 2011129347A JP 2011129347 A JP2011129347 A JP 2011129347A JP 5405526 B2 JP5405526 B2 JP 5405526B2
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forming apparatus
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JP2011168494A (en
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浩幸 苅谷
勝彦 森定
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Avanstrate Inc
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Description

本発明は、オーバーフローダウンドロー法により板ガラスを製造する板ガラス製造方法およびこの板ガラス製造方法に用いられるガラス成形装置に関する。   The present invention relates to a plate glass manufacturing method for manufacturing a plate glass by an overflow down draw method and a glass forming apparatus used in the plate glass manufacturing method.

液晶ディスプレイやプラズマディスプレイなどのフラットパネルディスプレイ（以下、「ＦＰＤ」という。）のガラス基板には、厚さが例えば０．５〜０．７ｍｍと薄い板ガラスが用いられている。このＦＰＤガラス基板用の板ガラスはサイズが大きなものであり、例えば第１世代では３００×４００ｍｍであるが、第１０世代になると２８５０×３０５０ｍｍとなる。   As a glass substrate of a flat panel display (hereinafter referred to as “FPD”) such as a liquid crystal display or a plasma display, a thin plate glass having a thickness of, for example, 0.5 to 0.7 mm is used. The plate glass for the FPD glass substrate has a large size, for example, 300 × 400 mm in the first generation, but becomes 2850 × 3050 mm in the tenth generation.

このようなＦＰＤガラス基用板ガラスを製造するには、オーバーフローダウンドロー法が最もよく使用される。オーバーフローダウンドロー法では、溶融ガラスをガラス成形装置に通すことで帯状のガラスリボンが連続的に成形される。その際、ガラスリボンが下方へ引き下げられ、その引き下げ速度によって厚みの調整が行われる。その後、ガラスリボンが所定長さで切断されて、板ガラスが製造される。   The overflow downdraw method is most often used to manufacture such FPD glass-based plate glass. In the overflow downdraw method, a glass ribbon is continuously formed by passing molten glass through a glass forming apparatus. At that time, the glass ribbon is pulled downward, and the thickness is adjusted by the pulling speed. Then, a glass ribbon is cut | disconnected by predetermined length, and plate glass is manufactured.

例えば、特許文献１には、図６に示すようなガラス成形装置１０が記載されている。このガラス成形装置１０は、所方向に延びる断面楔状の本体１１と、本体１１の両側面１２に沿って流下する溶融ガラスの幅を規制する一対のガイド１２とを備えている。   For example, Patent Document 1 describes a glass forming apparatus 10 as shown in FIG. The glass forming apparatus 10 includes a main body 11 having a wedge-shaped cross section extending in a certain direction, and a pair of guides 12 for regulating the width of molten glass flowing down along both side surfaces 12 of the main body 11.

特開２００３−３１３０３４号公報JP 2003-313034 A

ガラス成形装置１０により成形されるガラスリボン１５は、図７（ａ）に示すように、幅方向の両端部である耳部１５ａに至るまで均一な厚みであることが好ましい。しかしながら、特許文献１に記載のガラス成形装置１０では、ガラス成形装置１０の先端部分（下端部分）の溶融ガラスの粘度が例えば５０，０００Ｐａ・ｓ（１，１００℃）程度である場合には、図７（ｂ）に示すように、耳部１５ａがガラスリボンの長手方向に波打ちながら二叉状に開いてしまうことがある。このように耳部１５ａが開いてしまうと、ガラスリボン１５の形状不良が生じたり、または割れの原因となって連続操業に支障をきたすおそれがある。   As shown in FIG. 7A, the glass ribbon 15 formed by the glass forming apparatus 10 preferably has a uniform thickness up to the ear portions 15a that are both ends in the width direction. However, in the glass forming apparatus 10 described in Patent Document 1, when the viscosity of the molten glass at the tip portion (lower end portion) of the glass forming apparatus 10 is, for example, about 50,000 Pa · s (1,100 ° C.), As shown in FIG.7 (b), the ear | edge part 15a may open in a bifurcated shape, wavy in the longitudinal direction of a glass ribbon. Thus, if the ear | edge part 15a opens, there exists a possibility that the shape defect of the glass ribbon 15 may arise or it may cause a crack, and may interfere with a continuous operation.

これを防止するためには、ガラス成形装置１０の先端部分の溶融ガラスの粘度を例えば４，０００Ｐａ・ｓ（１，２００℃）程度と低くして溶融ガラスの流動性を向上させることが効果的であるが、このように溶融ガラスの粘度を下げるために溶融ガラスの温度を上げてしまうと、主に耐火煉瓦で構成された高価なガラス成形装置１０の寿命が低下することになる。   In order to prevent this, it is effective to improve the fluidity of the molten glass by reducing the viscosity of the molten glass at the tip of the glass forming apparatus 10 to about 4,000 Pa · s (1,200 ° C.), for example. However, if the temperature of the molten glass is raised in order to lower the viscosity of the molten glass in this way, the lifetime of the expensive glass forming apparatus 10 mainly composed of refractory bricks is reduced.

本発明は、このような事情に鑑み、溶融ガラスの粘度が相対的に高くても耳部の形状が安定したガラスリボンを成形することができる板ガラス製造方法およびガラス成形装置を提供することを目的とする。   In view of such circumstances, an object of the present invention is to provide a plate glass manufacturing method and a glass forming apparatus capable of forming a glass ribbon having a stable ear shape even when the viscosity of molten glass is relatively high. And

本発明の発明者は、前記目的を達成するためにガイドの形状に着目し、ガイドの形状を工夫することにより前記のような耳部の開きを抑制できるのではないかと考えた。すなわち、特許文献１に記載されたガラス成形装置１０では、図６に示すようにガイド１２が矩形状の輪郭を有しており、その下端部がフラットになっているので、溶融ガラスがガイドに接触した状態のまま本体から離れることになる。そこで、本発明の発明者は、これを改善することを思い付いた。   The inventor of the present invention pays attention to the shape of the guide in order to achieve the object, and thought that the opening of the ear portion as described above can be suppressed by devising the shape of the guide. That is, in the glass forming apparatus 10 described in Patent Document 1, since the guide 12 has a rectangular outline as shown in FIG. 6 and the lower end thereof is flat, the molten glass serves as the guide. It will leave the main body in contact. Thus, the inventor of the present invention has come up with an improvement.

本発明は、このような観点からなされたものである。すなわち、本発明は、ガラス成形装置の本体の上面に形成された供給溝から溢れ出した溶融ガラスを、互いに対向するように本体から周囲に張り出す一対のガイドで幅を規制しながら前記本体の一対の壁面に沿って流下させる際に、前記一対の壁面の下端部同士が交わって形成される稜線に向かって収束するように前記一対のガイドの一対の傾斜部を形成し、当該一対の傾斜部を伝って前記溶融ガラスが前記ガイドとの接触量を減らしながら前記稜線で融合する、板ガラス製造方法を提供する。 The present invention has been made from such a viewpoint. That is, the present invention controls the width of the main body while regulating the width of the molten glass overflowing from the supply groove formed on the upper surface of the main body of the glass forming apparatus with a pair of guides projecting from the main body so as to face each other . When flowing down along a pair of wall surfaces, a pair of inclined portions of the pair of guides are formed so as to converge toward a ridge line formed by the lower ends of the pair of wall surfaces intersecting each other, and the pair of inclinations Provided is a plate glass manufacturing method in which the molten glass is fused at the ridge line while reducing the amount of contact with the guide through a portion.

また、本発明は、溶融ガラスが供給される供給溝が形成された上面、および下端部同士が交わって稜線を形成する一対の壁面を有する本体と、互いに対向するように前記本体から周囲に張り出す一対のガイドと、を備え、前記一対の壁面の下端部同士が交わって形成される稜線に向かって収束するように前記一対のガイドの一対の傾斜部が形成され、当該一対の傾斜部を伝って前記溶融ガラスが前記ガイドとの接触量を減らしながら前記稜線で融合するように構成された、ガラス成形装置を提供する。 The present invention also provides a main body having a top surface on which a supply groove for supplying molten glass is formed, and a main body having a pair of wall surfaces where the lower end portions intersect to form a ridge line, and is stretched around the main body so as to face each other. A pair of guides, and a pair of inclined portions of the pair of guides are formed so as to converge toward a ridge line formed by the lower ends of the pair of wall surfaces intersecting each other. A glass forming apparatus is provided that is configured so that the molten glass is fused at the ridgeline while reducing the amount of contact with the guide .

本発明によれば、溶融ガラスの粘度が相対的に高くても、耳部の形状が安定したガラスリボンを成形することができる。   According to the present invention, even when the viscosity of the molten glass is relatively high, a glass ribbon having a stable shape of the ear portion can be formed.

本発明の一実施形態に係るガラス成形装置を示す正面図である。It is a front view which shows the glass forming apparatus which concerns on one Embodiment of this invention. 図１のガラス成形装置を示す斜視図である。It is a perspective view which shows the glass forming apparatus of FIG. 図１のガラス成形装置の側面断面図である。It is side surface sectional drawing of the glass forming apparatus of FIG. （ａ）は図３の要部拡大図、（ｂ）は従来のガラス成形装置の要部拡大断面図である。(A) is a principal part enlarged view of FIG. 3, (b) is a principal part expanded sectional view of the conventional glass forming apparatus. （ａ）〜（ｃ）は変形例のガラス成形装置の側面断面図である。(A)-(c) is side surface sectional drawing of the glass forming apparatus of a modification. 従来のガラス成形装置を示す斜視図である。It is a perspective view which shows the conventional glass forming apparatus. （ａ）は正常な形状のガラスリボンの断面図、（ｂ）は耳部が形状不良となったガラスリボンの断面図である。(A) is sectional drawing of the glass ribbon of a normal shape, (b) is sectional drawing of the glass ribbon from which the ear | edge part became a shape defect.

以下、本発明を実施するための最良の形態について、図面を参照しながら説明する。なお、以下の説明は本発明の一例に関するものであり、本発明はこれらによって限定されるものではない。   The best mode for carrying out the present invention will be described below with reference to the drawings. The following description relates to an example of the present invention, and the present invention is not limited to these.

図１および図２に示すように、本発明の一実施形態に係るガラス成形装置１は、水平面上の一方向に延びる本体２と、この本体２に固定された一対のガイド３とを備えている。なお、本明細書では、説明の便宜のために、本体２の延びる方向（図１では左右方向）を前後方向、これと直交する水平方向を左右方向といい、特に図１の左側を前方、図１の右側を後方という。   As shown in FIGS. 1 and 2, a glass forming apparatus 1 according to an embodiment of the present invention includes a main body 2 extending in one direction on a horizontal plane and a pair of guides 3 fixed to the main body 2. Yes. In the present specification, for convenience of explanation, the direction in which the main body 2 extends (the left-right direction in FIG. 1) is referred to as the front-rear direction, and the horizontal direction perpendicular thereto is referred to as the left-right direction. The right side of FIG.

本体２は、下向きに尖る五角形楔状（幅狭のホームベース状）の断面形状となっており、水平面と平行な長方形状の上面２１と、この上面２１の左右方向の両端部から下方に向かう一対の壁面２３とを有している。なお、上面２１は、水平面と平行である必要はなく、例えば前方に向かって前下がりの傾斜面または曲面となっていてもよい。   The main body 2 has a pentagonal wedge-shaped (narrow home base shape) cross-sectional shape that is pointed downward, a rectangular upper surface 21 parallel to the horizontal surface, and a pair of downwards from both left and right ends of the upper surface 21. Wall surface 23. The upper surface 21 does not need to be parallel to the horizontal plane, and may be, for example, an inclined surface or a curved surface that descends forward toward the front.

上面２１には、前後方向に延びる供給溝２２が形成されている。この供給溝２２の長さ
は、上面２１の前後両端部を少し残す程度に設定されていて、供給溝２２の開口２２ａは上面２１よりも一回り小さな長方形状をなしている。また、供給溝２２の底面２２ｂは、前方に向かって上り勾配の傾斜面となっている。なお、底面２２ｂは前方に向かって湾曲しながら上る曲面となっていてもよい。また、供給溝２２は底面２２ｂを有する断面コ字状のものである必要はなく、例えば断面Ｖ字状のものであってもよい。 A supply groove 22 extending in the front-rear direction is formed on the upper surface 21. The length of the supply groove 22 is set such that the front and rear end portions of the upper surface 21 are slightly left, and the opening 22 a of the supply groove 22 has a rectangular shape that is slightly smaller than the upper surface 21. Further, the bottom surface 22b of the supply groove 22 is an inclined surface having an upward slope toward the front. The bottom surface 22b may be a curved surface that rises while curving forward. Further, the supply groove 22 does not need to have a U-shaped cross section having the bottom surface 22b, and may have, for example, a V-shaped cross section.

供給溝２２には、本体２の後方から図示しない供給管を通じて溶融ガラス５が供給されるようになっている。そして、図示しない供給管から供給溝２２内に溶融ガラス５が供給されると、溶融ガラス５は供給溝２２内を前方に向かって流れながら、供給溝２２から上面２１に沿って左右両側に溢れ出し、上面２１の左右両端部から流れ落ちるようになる。   The molten glass 5 is supplied to the supply groove 22 from the rear of the main body 2 through a supply pipe (not shown). When the molten glass 5 is supplied into the supply groove 22 from a supply pipe (not shown), the molten glass 5 overflows from the supply groove 22 to the left and right sides along the upper surface 21 while flowing forward in the supply groove 22. It flows out from the left and right ends of the upper surface 21.

一対の壁面２３は、上面２１の左右両端部から流れ落ちる溶融ガラス５を誘導して融合させるものであり、それらの下端部同士が交わることにより前後方向に延びる稜線２４が形成されている。具体的に、一対の壁面２３のそれぞれは、上面２１の左端部または右端部から垂直に垂れ下がる垂直面２３ａと、この垂直面２３ａの下端部から互いに近づくように内向きに傾斜する傾斜面２３ｂとからなっている。そして、上面２１の左右両端部から流れ落ちる溶融ガラス５は、それぞれ壁面２３に沿って流下し、稜線２４の下方で融合する。これにより帯状のガラスリボン５０が連続して成形される。   The pair of wall surfaces 23 guide and fuse the molten glass 5 flowing down from both left and right end portions of the upper surface 21, and a ridge line 24 extending in the front-rear direction is formed by their lower end portions intersecting each other. Specifically, each of the pair of wall surfaces 23 includes a vertical surface 23a that hangs vertically from the left end portion or the right end portion of the upper surface 21, and an inclined surface 23b inclined inward so as to approach each other from the lower end portion of the vertical surface 23a. It is made up of. And the molten glass 5 which flows down from the right and left both ends of the upper surface 21 flows down along the wall surface 23, and unites below the ridgeline 24. Thereby, the strip-shaped glass ribbon 50 is continuously formed.

一対のガイド３は、前後方向で互いに対向し、両壁面２３に沿って流下する溶融ガラス５の幅を規制する、前後方向に扁平な板状のものである。一対のガイド３は、それらの内側面（他方のガイド３側を向く面）３ａが供給溝２２の開口２２ａにおける前後方向の短辺と合致する位置に配置されている。また、一対のガイド３のそれぞれは、図３に示すように前後方向から見たときに、壁面２３同士が交わる稜線２４上の点を頂点とする下向きに尖った輪郭を有している。すなわち、各ガイド３の下向きに尖る先端３３は、稜線２４上に位置している。本実施形態では、各ガイド３の輪郭は、上側の３辺が互いに垂直に交わり、下側の４辺が斜めを向く、左右対称な七角形状をなしている。   The pair of guides 3 are flat plate-like ones in the front-rear direction that face each other in the front-rear direction and restrict the width of the molten glass 5 that flows down along both wall surfaces 23. The pair of guides 3 are arranged at positions where their inner side surfaces (surfaces facing the other guide 3 side) 3 a coincide with the short sides in the front-rear direction of the opening 22 a of the supply groove 22. Each of the pair of guides 3 has a downwardly sharp outline with a point on the ridge line 24 where the wall surfaces 23 meet each other as a vertex when viewed from the front-rear direction as shown in FIG. That is, the tip 33 pointed downward in each guide 3 is located on the ridge line 24. In this embodiment, the outline of each guide 3 has a left-right symmetric heptagon shape in which the upper three sides intersect perpendicularly and the lower four sides are inclined.

より詳しくは、各ガイド３は、一対の壁面２３のそれぞれに沿って上下方向に延びる縦ガイド部３２と、本体２の上面２１上に位置し、縦ガイド部３２の上端部とつながる横ガイド部３１とを有している。さらに、縦ガイド部３２は、垂直面２３ａに沿う垂直部３２ａと、傾斜面２３ｂに沿う傾斜部３２ｂとを含んでいる。そして、傾斜部３２ｂの下部の所定領域（先端３３から当該傾斜部３２ｂの１／３程度）が稜線２４に向かって尖っていて、縦ガイド部３２が下方に向かって先細りとなっている。   More specifically, each guide 3 includes a vertical guide portion 32 extending in the vertical direction along each of the pair of wall surfaces 23, and a horizontal guide portion located on the upper surface 21 of the main body 2 and connected to the upper end portion of the vertical guide portion 32. 31. Further, the vertical guide portion 32 includes a vertical portion 32a along the vertical surface 23a and an inclined portion 32b along the inclined surface 23b. And the predetermined area | region (about 1/3 of the said inclination part 32b from the front-end | tip 33) of the lower part of the inclination part 32b is sharpened toward the ridgeline 24, and the vertical guide part 32 is tapering downward.

次に、本実施形態のガラス成形装置１の作用を説明する。   Next, the operation of the glass forming apparatus 1 of the present embodiment will be described.

まず、比較のために、図６に示す従来のガラス成形装置１０の作用について、図４（ｂ）を参照して説明する。従来のガラス成形装置１０では、ガイド１２の下端部１２ａがフラットになっているので、溶融ガラスがガイド１２に接触した状態のまま本体１１から離れることになる。別の見方をすれば、ガイド１２に接する部分の溶融ガラスは、壁面１１ａだけでなくガイド１２を伝って流下するようになり、図４（ｂ）中に矢印ｂで示すように流下する方向が壁面１１ａに沿った方向ではなくそれから少し開いた方向になる。これにより、ガイド１２に接する部分の溶融ガラスの軌跡Ｌ2は、ガラス成形装置１０の中央部での軌跡Ｌ1よりも開いてしまう。 First, for comparison, the operation of the conventional glass forming apparatus 10 shown in FIG. 6 will be described with reference to FIG. In the conventional glass forming apparatus 10, since the lower end portion 12 a of the guide 12 is flat, the molten glass leaves the main body 11 while being in contact with the guide 12. From another viewpoint, the molten glass in the portion in contact with the guide 12 flows down not only through the wall surface 11a but also through the guide 12, and the direction of flowing down as shown by the arrow b in FIG. It is not a direction along the wall surface 11a but a direction slightly opened from it. Thus, the locus L 2 of the molten glass portion in contact with the guide 12, will open than the locus L 1 of the central portion of the glass forming apparatus 10.

これに対し、本実施形態のガラス成形装置１では、図４（ａ）に示すように、下向きに尖るガイド３の先端３３が稜線２４上に位置しているので、ガイドに接する部分の溶融ガラス５は、ガイド３との接触量を減らしながら稜線２４に向かって流れるようになる。すなわち、ガイド３に接する部分の溶融ガラス５は、ガイド３の傾斜部３２ｂを伝って流下
することにより、図４（ａ）中に矢印ａで示すように稜線２４に向かって収束させられるようになる。そして、ガイド３に接する部分の溶融ガラス５は、最終的にはガイド３との接触量がゼロになった状態で本体２から離れる。このため、溶融ガラス５の粘度が例えば１００，０００Ｐａ・ｓ（１，０５０℃）程度と相対的に高くても、図７（ａ）に示すように耳部５０ａの形状が安定したガラスリボン５０を成形することができる。 On the other hand, in the glass forming apparatus 1 of the present embodiment, as shown in FIG. 4A, the tip 33 of the guide 3 that is pointed downward is positioned on the ridge line 24. 5 flows toward the ridgeline 24 while reducing the amount of contact with the guide 3. That is, the molten glass 5 in contact with the guide 3 flows down along the inclined portion 32b of the guide 3 so as to be converged toward the ridge line 24 as shown by an arrow a in FIG. Become. And the molten glass 5 of the part which touches the guide 3 leaves | separates from the main body 2 in the state where the contact amount with the guide 3 became zero finally. For this reason, even if the viscosity of the molten glass 5 is relatively high, for example, about 100,000 Pa · s (1,050 ° C.), the glass ribbon 50 in which the shape of the ear portion 50a is stable as shown in FIG. Can be molded.

なお、前記実施形態では、前後方向から見たときのガイド３の輪郭が七角形状になっているが、ガイド３の輪郭は、稜線２４上の点を頂点とする下向きに尖ったものであればよく、特に限定されるものではない。例えば図５（ａ）に示すように、傾斜部３２ｂの全体が稜線２４に向かって尖っていて、ガイド３の輪郭が五角形状になっていてもよい。   In the embodiment, the outline of the guide 3 when viewed from the front-rear direction is a heptagon. However, the outline of the guide 3 may be pointed downward with a point on the ridge line 24 as a vertex. There is no particular limitation. For example, as shown in FIG. 5A, the entire inclined portion 32b may be sharpened toward the ridgeline 24, and the outline of the guide 3 may be a pentagon.

また、傾斜部３２ｂの下部または全体が稜線２４に向かって尖る形状は、鋭利な三角形状である必要はなく、例えば図５（ｂ）に示すように、外側の辺が円弧状を描いていてもよい。   Further, the shape in which the lower part or the whole of the inclined part 32b is pointed toward the ridge line 24 does not need to be a sharp triangular shape. For example, as shown in FIG. 5B, the outer side has an arc shape. Also good.

さらに、縦ガイド部３２ｂは、例えば図５（ｃ）に示すように、垂直部３２ａから傾斜部３２ｂにかけて連続する曲線を描きながら下方に向かって先細りとなっていてもよい。   Further, as shown in FIG. 5C, for example, the vertical guide portion 32b may be tapered downward while drawing a continuous curve from the vertical portion 32a to the inclined portion 32b.

また、ガイド部３は、前後方向に扁平な板状のものである必要はなく、内側面３ａのうち壁面２３と交わる部分が壁面２３と直交するものであればよい。例えば、ガイド部３は、図６に示す従来のガラス成形装置１０と同様に横ガイド部３１の中央部が外側に張り出す形状となっていてもよいし、あるいは外側面が外側に膨らむような三次元的な形状となっていてもよい。   Moreover, the guide part 3 does not need to be a flat plate-like thing in the front-back direction, and the part which cross | intersects the wall surface 23 among the inner surface 3a should just be orthogonal to the wall surface 23. FIG. For example, the guide portion 3 may have a shape in which the central portion of the lateral guide portion 31 projects outwards as in the conventional glass forming apparatus 10 shown in FIG. 6, or the outer surface swells outward. It may be a three-dimensional shape.

本発明は、ＦＰＤガラス基板用の板ガラスを製造する板ガラス製造方法およびこの板ガラス製造方法に用いられるガラス成形装置に特に好適である。   The present invention is particularly suitable for a plate glass manufacturing method for manufacturing a plate glass for an FPD glass substrate and a glass forming apparatus used in the plate glass manufacturing method.

１ ガラス成形装置
２ 本体
２１ 上面
２２ 供給溝
２３ 壁面
２３ａ 垂直面
２３ｂ 傾斜面
２４ 稜線
３ ガイド
３１ 横ガイド部
３２ 縦ガイド部
３２ａ 垂直部
３２ｂ 傾斜部
５ 溶融ガラス
５０ ガラスリボン
５０ａ 耳部 DESCRIPTION OF SYMBOLS 1 Glass forming apparatus 2 Main body 21 Upper surface 22 Supply groove 23 Wall surface 23a Vertical surface 23b Inclined surface 24 Ridge line 3 Guide 31 Horizontal guide part 32 Vertical guide part 32a Vertical part 32b Inclined part 5 Molten glass 50 Glass ribbon 50a Ear part

Claims (2)

ガラス成形装置の本体の上面に形成された供給溝から溢れ出した溶融ガラスを、互いに対向するように本体から周囲に張り出す一対のガイドで幅を規制しながら前記本体の一対の壁面に沿って流下させる際に、
前記一対の壁面の下端部同士が交わって形成される稜線に向かって収束するように前記一対のガイドの一対の傾斜部を形成し、当該一対の傾斜部を伝って前記溶融ガラスが前記ガイドとの接触量を減らしながら前記稜線で融合する、板ガラス製造方法。 Along the pair of wall surfaces of the main body, the width of the molten glass overflowing from the supply groove formed on the upper surface of the main body of the glass forming apparatus is regulated by a pair of guides projecting from the main body so as to face each other. When letting down
A pair of inclined portions of the pair of guides are formed so as to converge toward a ridge line formed by intersecting lower ends of the pair of wall surfaces, and the molten glass passes through the pair of inclined portions and the guide. The glass sheet manufacturing method of fusing at the ridge line while reducing the contact amount of the glass. 溶融ガラスが供給される供給溝が形成された上面、および下端部同士が交わって稜線を形成する一対の壁面を有する本体と、互いに対向するように前記本体から周囲に張り出す一対のガイドと、を備え、
前記一対の壁面の下端部同士が交わって形成される稜線に向かって収束するように前記一対のガイドの一対の傾斜部が形成され、当該一対の傾斜部を伝って前記溶融ガラスが前記ガイドとの接触量を減らしながら前記稜線で融合するように構成された、ガラス成形装置。 An upper surface on which a supply groove for supplying molten glass is formed, and a main body having a pair of wall surfaces that form a ridge line by intersecting lower ends, a pair of guides projecting from the main body so as to face each other, With
A pair of inclined portions of the pair of guides are formed so as to converge toward a ridge line formed by intersecting lower ends of the pair of wall surfaces, and the molten glass is transferred to the guide through the pair of inclined portions. A glass forming apparatus configured to fuse at the ridgeline while reducing the amount of contact .
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