JPS5920607B2 - Method of manufacturing plate glass - Google Patents
Method of manufacturing plate glassInfo
- Publication number
- JPS5920607B2 JPS5920607B2 JP17719080A JP17719080A JPS5920607B2 JP S5920607 B2 JPS5920607 B2 JP S5920607B2 JP 17719080 A JP17719080 A JP 17719080A JP 17719080 A JP17719080 A JP 17719080A JP S5920607 B2 JPS5920607 B2 JP S5920607B2
- Authority
- JP
- Japan
- Prior art keywords
- weir member
- glass
- molten glass
- molten
- space
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B18/00—Shaping glass in contact with the surface of a liquid
- C03B18/02—Forming sheets
- C03B18/20—Composition of the atmosphere above the float bath; Treating or purifying the atmosphere above the float bath
- C03B18/22—Controlling or regulating the temperature of the atmosphere above the float tank
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B18/00—Shaping glass in contact with the surface of a liquid
- C03B18/02—Forming sheets
- C03B18/04—Changing or regulating the dimensions of the molten glass ribbon
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B18/00—Shaping glass in contact with the surface of a liquid
- C03B18/02—Forming sheets
- C03B18/16—Construction of the float tank; Use of material for the float tank; Coating or protection of the tank wall
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/26—Outlets, e.g. drains, siphons; Overflows, e.g. for supplying the float tank, tweels
- C03B5/265—Overflows; Lips; Tweels
- C03B5/267—Overflows; Lips; Tweels specially adapted for supplying the float tank
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
Description
【発明の詳細な説明】
本発明は溶融金属浴上に溶融ガラスを供給し、溶融ガラ
スを溶融金属浴上において薄板状に成形し、その後これ
を溶融金属浴から引き出すようにした所謂フロート法ガ
ラス製板に関し、フロート法ガラス製板において１ｍｍ
以下の厚さの薄板ガラスを製造するのに特に好適な方法
に係る。Detailed Description of the Invention The present invention provides a so-called float method glass in which molten glass is supplied onto a molten metal bath, the molten glass is formed into a thin plate shape on the molten metal bath, and then the molten glass is drawn out from the molten metal bath. Regarding plate making, 1mm in float method glass plate making.
The present invention relates to a particularly suitable method for producing thin glass having a thickness of:
フロート法ガラス製板において所謂平衡厚以下の板厚の
ガラスを製造する場合は溶融金属浴出口以後においてけ
ん引力を働かしめ、電融金属上のガラスリボンを引き伸
ばすことが行われてきた。When producing a glass plate having a thickness below the so-called equilibrium thickness using the float method, a traction force has been applied after the exit of the molten metal bath to stretch the glass ribbon on the molten metal.
しかしこのような従来方法においてはガラスリボンの幅
方向に収縮力が作用するため、この収縮力に対抗するよ
うにガラスリボンの側端部にトップロールを係合させる
手段が採用されている。However, in such a conventional method, since a shrinkage force acts in the width direction of the glass ribbon, a means for engaging a top roll with the side end portion of the glass ribbon is adopted to counteract this shrinkage force.
従って上述の方法ではガラスリボンの側端部がトップロ
ールと十分に係合し得るだけの厚さを有することが必要
であシ、２ｍｍ程度までの板ガラス製造は可能であって
も、それ以下の板厚を有する板ガラスを商業的に生産す
ることは困難であった。Therefore, in the above method, it is necessary that the side edges of the glass ribbon have a thickness sufficient to engage with the top roll, and although it is possible to manufacture plate glass up to about 2 mm, it is necessary to have a thickness sufficient to engage the top roll. It has been difficult to commercially produce plate glass of such thickness.
一刀、フロート法ガラス製板においてよ砂薄い板ガラス
を製造するための改良として、特公昭５４−３１０１２
号公報には溶融金属浴上に溶融ガラスの流れを横切る方
向に堰部材を設け、この堰部材により溶融金属浴上に溶
融ガラスの溜りを形成し、堰部材の区域で溶融ガラスを
通電加熱しつつ溶融ガラスを堰部材と溶融金属浴面との
間を通過させ、薄い板ガラスを製造する方法が記載され
ている。Itto, as an improvement for producing thinner plate glass using the float method, was published in 1983-31012.
In the publication, a weir member is provided above a molten metal bath in a direction transverse to the flow of molten glass, a pool of molten glass is formed on the molten metal bath by this weir member, and the molten glass is heated by electricity in the area of the weir member. A method for manufacturing thin plate glass by passing molten glass between a weir member and a molten metal bath surface is described.
しかしながら、このような方法によれば、極めて薄い板
ガラスの製造が可能とはなるが、従来のフロート法にお
いて問題にならなかった品質上および生産上の問題を惹
起するものであった。However, although such a method makes it possible to manufacture extremely thin plate glass, it causes quality and production problems that did not occur in the conventional float method.
すなわち、品質上の問題としてはガラスリボンの流れ方
向に連続的な筋が発生し、あるいは製造されるガラスシ
ート内部に泡が発生する問題があつた。That is, as a quality problem, continuous streaks occur in the flow direction of the glass ribbon, or bubbles occur inside the manufactured glass sheet.
このうちガラスリボンの流れ方向に連続して発生する筋
については溶融ガラスの堰部材との濡れ特性が極めて大
きな発生因子になることが確認された。It has been confirmed that the wetting characteristics of the molten glass with the weir member are an extremely important factor in the occurrence of streaks that occur continuously in the flow direction of the glass ribbon.
すなわち、溶融金属と堰部材との間隙を通過した溶融ガ
ラスは溶融ガラスの堰部材との相互の親和力に応じて堰
部材のガラスリボンよりも高い位置にまで上昇し、堰部
材部分において溶融ガラスは一種のゴブ（ｇｏｂ）を形
成し、その後ガラスシートに成形され、このゴブが犬で
あればある程製造されるガラスシートには顕著に筋が発
生するものであった。In other words, the molten glass that has passed through the gap between the molten metal and the weir member rises to a higher position than the glass ribbon of the weir member depending on the mutual affinity between the molten glass and the weir member, and the molten glass in the weir member part A type of gob is formed and then formed into a glass sheet, and the more the gob is a dog, the more streaks will appear on the manufactured glass sheet.
そして前述した特公昭５４−３１０１２号公報に示され
た発明では堰部材の区域を加熱するため堰部材に接する
溶融ガラスの温度が高くなって堰部材が溶融ガラスに濡
れやすくなり筋の発生を抑制することは困難であった。In the invention disclosed in the above-mentioned Japanese Patent Publication No. 54-31012, since the area of the weir member is heated, the temperature of the molten glass in contact with the weir member increases, making it easier for the weir member to get wet with the molten glass, thereby suppressing the generation of streaks. It was difficult to do so.
また、泡の発生はその加熱力法に大きく起因することが
確められた。It was also confirmed that the generation of bubbles was largely due to the heating force method.
特公昭５４−３１０１２号公報の発明では堰部材と溶融
錫を電極として溶融ガラスに通電し、ジュール熱により
溶融ガラスを加熱するものであり、この方法では製板さ
れた板ガラスに著しいデメリットをもたらすものであり
、また堰部材をカーボンあるいは金属で成形し、これに
より溶融ガラスに通電した場合にも製板された板ガラス
に極めて多数の小泡の存在が認められるものであった。The invention disclosed in Japanese Patent Publication No. 54-31012 uses a weir member and molten tin as electrodes to energize the molten glass and heat the molten glass with Joule heat, but this method has significant disadvantages in the plate glass produced. Moreover, even when the weir member is formed of carbon or metal and electricity is applied to the molten glass, the presence of an extremely large number of small bubbles is observed in the produced plate glass.
小泡の発生理由は必ずしも定かではないが、以下の２つ
の理由が考えられ、それぞれの理由により多数の泡が発
生するものと思われる。Although the reason for the generation of small bubbles is not necessarily certain, the following two reasons are considered, and it is thought that a large number of bubbles are generated due to each reason.
その第１の理由は、堰部材が所謂通電によりマイグレー
ションを受け、堰部材の構成物質が溶融ガラス中に容易
に拡散し、溶融ガラスと反応し、小泡を発生するもので
ある。The first reason is that the weir member undergoes migration due to so-called energization, and the constituent substances of the weir member easily diffuse into the molten glass, react with the molten glass, and generate small bubbles.
これを防止するためには直流成分を完全にカッ′トシた
高周波電源を使用することが必要であるが、これは商業
的には得策ではない。In order to prevent this, it is necessary to use a high frequency power source that completely cuts out the DC component, but this is not commercially advisable.
例えば堰部材としてカーボンを使用した場合、２００Ａ
、２５Ｖの通電により、カーボンは数時間後には溶融ガ
ラスとの接触面が多数の凹凸部を有した粗面と々ってし
まい、単に小泡の発生のみならず筋の顕著な発生をも惹
起してしまうものであった。For example, if carbon is used as a weir member, 200A
By applying a current of 25V, the contact surface of the carbon with the molten glass becomes a rough surface with many uneven parts after a few hours, causing not only the generation of small bubbles but also the formation of noticeable streaks. It was something I would end up doing.
第２の理由は電流密度の不均一という点があげられる。The second reason is that the current density is non-uniform.
ガラス溶融窯よりカナルを通じて溶融金属浴に供給され
る溶融ガラスにおいて、溶融ガラスの溶融金属浴の幅方
向における温度分布は必ずしも同じではなく、溶融金属
浴の中央部が高くその側部は低いという温度分布をもっ
ている。In molten glass that is supplied from a glass melting furnace to a molten metal bath through a canal, the temperature distribution of the molten glass in the width direction of the molten metal bath is not necessarily the same, and the temperature is higher in the center of the molten metal bath and lower on the sides. It has a distribution.
これはその側部の溶融ガラスが大気と接触しているカナ
ル側壁によって冷却されるために生じる不可避々現象で
ある。This is an unavoidable phenomenon that occurs because the molten glass on the side is cooled by the canal side wall that is in contact with the atmosphere.
しかるに溶融ガラスの電気抵抗は、その温度に対し負の
特性を有しているため、溶融ガラス温度の高い中央部に
おいては電流密度が高くなり、その結果、中央部と、側
部との温度差はさらに犬となり、その結果中央部におい
ては溶融ガラス温度が必要以上高くなり、所謂リボイル
された状態となり発泡を生じ、一方側部においては所定
の溶融ガラス湿度が得られないという現象を生じるもの
であった。However, the electrical resistance of molten glass has a negative characteristic with respect to its temperature, so the current density increases in the center where the molten glass temperature is high, and as a result, the temperature difference between the center and the sides increases. As a result, the temperature of the molten glass becomes higher than necessary in the center, resulting in a so-called reboiled state, which causes foaming, and a phenomenon in which the specified molten glass humidity cannot be obtained on one side. there were.
また溶融ガラスの中央部と側部との湿度差、特に中央部
の温度を所定の温度とした場合、側部の淵ｉが所定の温
度よりも低くなってしまうという現象は製品となりうる
部分の減少につながり生産性の点においても好ましいも
のでなかった。In addition, the difference in humidity between the center and side parts of molten glass, especially when the temperature of the center part is set to a predetermined temperature, the edge i of the side part becomes lower than the predetermined temperature. This led to a decrease in productivity and was not favorable in terms of productivity.
本発明は上述した従来技術の欠点を解消し、筋および泡
の発生が抑制され、良好な薄板ガラスを高い歩留で生産
し得る方法を提供するものであり、その特徴とするとこ
ろは所謂フロートにおいて、溶融金属浴上部空間を堰部
材および堰部材に併設された断熱部材によシ高湛雰囲気
の堰部材上流側空間と低温雰囲気の堰部材下流側空間と
に分割し、堰部材上流側空間で溶融ガラスを均一加熱し
、次いで溶融ガラスの堰部材からはみ出る両端部を、堰
部材下流側空間に供給されて該空間から前記堰部材上流
側空間に向って堰部材の両側力を流れる窒素と水素の混
合気体によシ冷却しながら溶融ガラスの中央部を通過抵
抗がその進行方向に向うに従って増すようになされてい
る堰部材と溶融金属浴との間を通過させ、堰部材の下流
側表面を冷却することにより堰部材から離れようとする
溶融ガラスを冷却するようにすることにある。The present invention solves the above-mentioned drawbacks of the prior art, and provides a method that suppresses the generation of streaks and bubbles and can produce high-quality thin glass at a high yield. The space above the molten metal bath is divided by a weir member and a heat insulating member attached to the weir member into a space upstream of the weir member having a high atmosphere and a space downstream of the weir member having a low temperature atmosphere. The molten glass is heated uniformly by heating the molten glass, and then both ends of the molten glass protruding from the weir member are heated with nitrogen that is supplied to the space on the downstream side of the weir member and flows through both sides of the weir member from the space toward the space on the upstream side of the weir member. While cooling the molten glass with a hydrogen gas mixture, the central part of the molten glass is passed between the molten metal bath and a weir member whose passing resistance increases in the direction of movement of the molten glass, and the downstream surface of the weir member is The objective is to cool the molten glass that is about to leave the weir member by cooling the molten glass.
以下に本発明をより詳細に説明すると、まず、本発明に
おいては堰部材の領域における溶融ガラスの加熱は行わ
ず、さらに堰部材の下流側表面を積極的に冷却するもの
であシ、そのために堰部材および堰部材に併設された断
熱部材によシ溶融金属浴の上部空間を堰部材上流側空間
と堰部材下流側空間とに分割し、相互の雰囲気の熱的干
渉を可及的に少なくし、堰部材下流側空間に設けた冷却
手段により冷却された低温雰囲気により堰部材の下流側
表面を冷却するようにする。The present invention will be explained in more detail below. First, in the present invention, the molten glass is not heated in the region of the weir member, and furthermore, the downstream surface of the weir member is actively cooled. The upper space of the molten metal bath is divided into a space upstream of the weir member and a space downstream of the weir member by the weir member and a heat insulating member attached to the weir member, thereby minimizing thermal interference between the atmospheres of the weir member and the weir member. The downstream surface of the weir member is cooled by the low-temperature atmosphere cooled by the cooling means provided in the downstream space of the weir member.
このようにすることにより、堰部材をくぐり抜ける溶融
ガラスの堰部材に対する濡れは少なくなシ、その結果、
従来技術の如きゴブの発生は抑制され、製造される板ガ
ラス表面の筋の発生も抑制されることになる。By doing this, the weir member is less wetted by the molten glass passing through the weir member, and as a result,
The occurrence of gobs as in the prior art is suppressed, and the occurrence of streaks on the surface of the manufactured glass plate is also suppressed.
堰部材下流側空間に設けられる冷却手段の設置位置およ
び冷却能については慎重な配慮が必要である。Careful consideration must be given to the installation position and cooling capacity of the cooling means provided in the space downstream of the weir member.
すなわち、冷却手段によって冷却された低温雰囲気が堰
部材の下流側表面に到達し、これを冷却し得るような設
計が必要となり、堰部材と溶融ガラスとの接触部分より
も上方にあって堰部材に近接した位置に設置するのが好
ましい。In other words, a design is required in which the low-temperature atmosphere cooled by the cooling means can reach the downstream surface of the weir member and cool it. It is preferable to install it in a position close to the
この冷却手段により冷却された低温雰囲気は徐々に下降
しながら堰部材の下流側表面に達しそれを冷却すること
になる。The low-temperature atmosphere cooled by this cooling means gradually descends to reach the downstream surface of the weir member and cool it.
また、本発明においては高混域、−すなわち堰部材上流
側空間の上方に加熱手段を設けるものである。Further, in the present invention, heating means is provided above the high mixing area, that is, the space on the upstream side of the weir member.
この加熱手段が該空間の溶融ガラスプールに接近して設
けられると、ともすれば溶融ガラスプールの幅方向にお
ける温度差を発生させ、発生した温ｉ差が訂正されない
まま溶融ガラスが堰部材をくぐり抜けてしまうので、加
熱手段の設置位置は堰部材から十分に離隔し、しかも溶
融ガラスプールの十分上方であることが必要である。If this heating means is provided close to the molten glass pool in the space, it may cause a temperature difference in the width direction of the molten glass pool, and the molten glass may pass through the weir member without correcting the generated temperature difference. Therefore, it is necessary that the heating means be installed sufficiently away from the weir member and sufficiently above the molten glass pool.
さらにまた、本発明においては堰部材下流側空間に窒素
および水素の混合気体を供給し、この混合気体の一部が
堰部材と、溶融金属浴側壁との間隙から堰部材上流側空
間に侵入するようにし、この際溶融ガラスリボンの耳部
を冷却するようにする。Furthermore, in the present invention, a mixed gas of nitrogen and hydrogen is supplied to the space on the downstream side of the weir member, and a part of this mixed gas enters the space on the upstream side of the weir member through the gap between the weir member and the side wall of the molten metal bath. At this time, the edges of the molten glass ribbon are cooled.
窒素および水素の混合気体は溶融金属浴内への酸素の侵
入を防止し、かつ溶融金属浴内雰囲気を還元性雰囲気に
保ち、酸化スズの発生を防止するためのものである。The mixed gas of nitrogen and hydrogen is used to prevent oxygen from entering the molten metal bath, maintain the atmosphere within the molten metal bath in a reducing atmosphere, and prevent the generation of tin oxide.
欠に本発明を添付図面を参照して説明する。The present invention will now be briefly described with reference to the accompanying drawings.
第１図において、溶融ガラスは図示されていないガラス
溶融窯において溶解されたものであり、この溶融ガラス
１はツイール２によりその量を制御されながらリップタ
イル３に沿って溶融金属浴Ａに供給される。In FIG. 1, molten glass is melted in a glass melting furnace (not shown), and this molten glass 1 is supplied to a molten metal bath A along a lip tile 3 while its amount is controlled by a twill 2. Ru.
溶融金属浴Ａは第２図に示される耐火物側壁１８、底部
耐火物５および天井構造から構成されている。Molten metal bath A is comprised of refractory side walls 18, bottom refractory 5 and ceiling structure shown in FIG.
底部構造に関し、本実施例においては、底深部６及び底
浅部７が形成されているが、その目的は後述する溶融ガ
ラスプール１１に供給される溶融ガラスの持込熱量によ
る溶融金属８の対流を制御するものであり、溶融ガラス
プール１１に供給される単位時間当りの溶融ガラス量あ
るいは他の手段による溶融金属８の対流制御手段が採用
された場合には、底部構造は均一な深さの底部構造を採
用する事ができる。Regarding the bottom structure, in this embodiment, a deep bottom part 6 and a shallow bottom part 7 are formed, the purpose of which is to prevent convection of the molten metal 8 due to the amount of heat brought in by the molten glass supplied to the molten glass pool 11, which will be described later. If the convection control means of the molten metal 8 by the amount of molten glass supplied to the molten glass pool 11 per unit time or other means is adopted, the bottom structure will have a uniform depth. A bottom structure can be adopted.
ウェットバックタイル９、底部耐火物５上の溶融金属８
、堰部材１０、及び耐火物側壁１８により溶融ガラスプ
ール１１が形成される。Wetback tile 9, molten metal 8 on bottom refractory 5
, the weir member 10 , and the refractory side wall 18 form a molten glass pool 11 .
溶融ガラスプール１１上部の天井構造はフラットアーチ
１２によって構成され、核部は他の天井構造と比較して
より高い天井構造となっている。The ceiling structure above the molten glass pool 11 is composed of a flat arch 12, and the core has a higher ceiling structure than other ceiling structures.
下流端のフラットアーチ１２に隣接し断熱壁１３が設け
られ、堰部材１０に併設された補助断熱壁１４、と共に
断熱部材を構成する。A heat insulating wall 13 is provided adjacent to the flat arch 12 at the downstream end, and forms a heat insulating member together with an auxiliary heat insulating wall 14 attached to the weir member 10.
断熱壁１３以後の天井構造１５は低い天井構造を構成す
る。The ceiling structure 15 after the heat insulating wall 13 constitutes a low ceiling structure.
以上の構成により溶融金属浴Ａは層上流側に位置する溶
融ガラスプール１１が形成される堰部材上流側空間１６
と堰部材下流側空間１７とに分割される。With the above configuration, the molten metal bath A is formed in the weir member upstream space 16 in which the molten glass pool 11 located on the upstream side of the layer is formed.
and a weir member downstream space 17.
上流側空間１６には溶融ガラスプール１１より離隔して
加熱手段１６′が設けられ、また下流側空間１７には雰
囲気冷却手段１７′が設けられている。A heating means 16' is provided in the upstream space 16 at a distance from the molten glass pool 11, and an atmosphere cooling means 17' is provided in the downstream space 17.
これら加熱手段１６′および冷却手段１７′はそれぞれ
予め設計された位置に設けられている。These heating means 16' and cooling means 17' are respectively provided at predesigned positions.
溶融ガラスプール１１の溶融ガラスは上流空間１６にお
ける自然放熱により湿度が低下する。The humidity of the molten glass in the molten glass pool 11 decreases due to natural heat radiation in the upstream space 16.
これに対処するため上流側空間１６に設けられた加熱手
段１６′が作動し、溶融ガラスの湿度低下を防ぐ。To cope with this, the heating means 16' provided in the upstream space 16 is activated to prevent the humidity of the molten glass from decreasing.
この溶融ガラスプール１１の溶融ガラスは堰部材１０と
溶融金属８との間を通過することにより伸延される。The molten glass in the molten glass pool 11 is elongated by passing between the weir member 10 and the molten metal 8.
第２図および第３図において、断熱壁１３および補助断
熱壁１４は溶融金属浴Ａの全幅に亘って設けられ、一方
堰部材１０は堰側端と耐火物側壁１８との間に間隙１８
′を有するように設けられる。2 and 3, the insulation wall 13 and the auxiliary insulation wall 14 are provided over the entire width of the molten metal bath A, while the weir member 10 is provided with a gap 18 between the weir side end and the refractory side wall 18.
'.
なお、図中の１９はカーボンバリヤーである。Note that 19 in the figure is a carbon barrier.
第４図において、下流側空間１７の耐火天井構成１５に
は窒素と水素の混合気体を供給するための配管２１が設
けられている。In FIG. 4, the fireproof ceiling structure 15 of the downstream space 17 is provided with a pipe 21 for supplying a mixed gas of nitrogen and hydrogen.
また、下流側空間１７の最下端の溶融金属浴出口には雰
囲気を遮断するだめの、例えばアスベストクロスで製作
された所謂ドレープ２２が設けられている。Further, a so-called drape 22 made of, for example, asbestos cloth is provided at the molten metal bath outlet at the lowest end of the downstream space 17 to block the atmosphere.
配管２１からは適当な比率に混合された窒素と水素の混
合気体が下流側空間１７に供給される。A gas mixture of nitrogen and hydrogen mixed in an appropriate ratio is supplied from the pipe 21 to the downstream space 17 .
この混合気体の供給は混合気体が延伸されたガラスリボ
ンを部分的に冷却しない限りは特に問題を生じることは
なく、これにより溶融金属８の酸化を防止し、下流側空
間１７の雰囲気を設定された温度に保つ補助的な作用を
も有している。The supply of this gas mixture does not cause any particular problem as long as the gas mixture does not partially cool the stretched glass ribbon, thereby preventing oxidation of the molten metal 8 and setting the atmosphere of the downstream space 17. It also has an auxiliary function to maintain a certain temperature.
混合気体は連続して供給され、従って下流側空間１７の
圧力は大気に対して正圧となり、混合気体の一部はドレ
ープ２２とガラスリボン３２との間およびガラスリボン
３２と溶融金属浴構成体との間を通り大気中に逃げる。The gas mixture is continuously supplied, so that the pressure in the downstream space 17 is positive relative to the atmosphere, and a portion of the gas mixture is distributed between the drape 22 and the glass ribbon 32 and between the glass ribbon 32 and the molten metal bath structure. It escapes into the atmosphere through the space between the
一方、混合気体の一部は溶融金属浴の上流側へと向い堰
部材１０の下流側表面１０′を冷却し、溶融ガラスの堰
部材に対する濡れを減少させ、板ガラス表面の筋の発生
を防止し、その後堰部材１０と側壁１８との間の間隙１
８′を通り、上流側空間１，６に侵入し、上流側空間１
６における溶融金属８の酸化を防止する。On the other hand, a portion of the mixed gas flows toward the upstream side of the molten metal bath and cools the downstream surface 10' of the weir member 10, reducing the wetting of the molten glass to the weir member and preventing the generation of streaks on the surface of the sheet glass. , then the gap 1 between the weir member 10 and the side wall 18
8', enters the upstream spaces 1 and 6, and enters the upstream space 1.
6 to prevent oxidation of the molten metal 8.
この際、堰部材１０と側壁１８との間において形成され
るガラスリボン３２端部の所謂耳部３１と称される比較
的板厚の厚い部分を冷却し、この耳部３１の冷却により
フロート現象と呼ばれるガラスリボンが平衡厚に戻ろう
とする現象を阻止する。At this time, a relatively thick part called the so-called ear part 31 at the end of the glass ribbon 32 formed between the weir member 10 and the side wall 18 is cooled, and the cooling of this ear part 31 causes the float phenomenon. This prevents the glass ribbon from returning to its equilibrium thickness.
なお、堰部材１０は溶融ガラス１に濡れにくい材質、例
えば窒化硼素、グラファイト等で形成することが望まし
い。The weir member 10 is desirably made of a material that does not easily wet the molten glass 1, such as boron nitride or graphite.
また堰部材１０の形状は第１図あるいは第４図に示され
るように溶融ガラスプール１１から引出される時、徐々
にその抵抗が犬になるように形成され、下流側空間１Ｔ
側の面は垂直に立上るように形成することが望ましい。The shape of the weir member 10 is such that when it is pulled out from the molten glass pool 11, its resistance gradually increases as shown in FIG. 1 or 4, and the downstream space 1T
It is desirable that the side surfaces are formed to stand up vertically.
堰部材１０の材質および形状を上述のようにすることに
より堰部材１０と溶融ガラス１との間におけるゴブの形
成が可及的に抑制されるように々る。By making the material and shape of the weir member 10 as described above, the formation of gobs between the weir member 10 and the molten glass 1 is suppressed as much as possible.
断熱部材については第１図あるいは第４図のように補助
断熱部材を使用する場合であっても、あるいは第５図の
ように補助断熱部材を使用しない場合であっても、冷却
効果をあげるために堰部材の下流側表面を必要以上に被
覆すべきではない。Regarding heat insulating members, in order to increase the cooling effect, even if an auxiliary heat insulating member is used as shown in Figure 1 or 4, or even if no auxiliary heat insulating member is used as shown in Figure 5. The downstream surface of the weir member should not be coated more than necessary.
次に上記したような構成の装置を用いた、よシ具体的な
操業の一例を示す。Next, a more specific example of operation using the apparatus configured as described above will be described.
ガラス溶融窯で溶解された溶融ガラス１はツイール２に
よってその流量が制限され、１０００に９／Ｈｒの割合
で溶融金属浴４に供給され、溶融ガラスフール１１を形
成する。The flow rate of the molten glass 1 melted in the glass melting furnace is restricted by the twill 2, and is supplied to the molten metal bath 4 at a ratio of 1000 to 9/Hr to form a molten glass fool 11.
溶融ガラスプール１１における溶融ガラスの温度は１１
５０℃であり、その時の粘度は約２Ｘ１０４ポイズであ
る。The temperature of the molten glass in the molten glass pool 11 is 11
The temperature is 50° C., and the viscosity at that time is about 2×10 4 poise.
溶融ガラスプール１１における溶融ガラス１の温度はそ
の上部に設けられた加熱手段１６′によって制御される
が、ガラス溶融窯と溶融金属浴Ａとを結ぶ所謂カナルで
も行われる。The temperature of the molten glass 1 in the molten glass pool 11 is controlled by a heating means 16' provided above it, but also by a so-called canal connecting the glass melting furnace and the molten metal bath A.
溶融ガラスプール１１を形成した溶融ガラスはリフトア
ウトロール２３によりけん引されて引出され、堰部材１
０とリフトアウトロール２３との間において延伸力を受
は薄く引伸される。The molten glass that has formed the molten glass pool 11 is pulled and pulled out by the lift-out roll 23, and is pulled out from the weir member 1.
The material is thinly stretched by a stretching force between the roller 0 and the lift-out roll 23.
例えば、溶融ガラスプール１１への溶融ガラス１の流入
量を前述したように１００ （ｌＫｉ？／Ｈｒとし、溶
融ガラスプール１１の溶融ガラス温度を１１５０℃とし
、リフトアウトロール２３によるガラスリボン３２の引
張速度を４．２ｍ／分とした場合、０．４ｍｒｎの厚さ
を有するガラスリボン３２が連続して得られる。For example, the flow rate of the molten glass 1 into the molten glass pool 11 is set to 100 (lKi?/Hr) as described above, the molten glass temperature of the molten glass pool 11 is set to 1150°C, and the tension of the glass ribbon 32 by the lift-out roll 23 is set to 100 (lKi?/Hr). At a speed of 4.2 m/min, a glass ribbon 32 having a thickness of 0.4 mrn is continuously obtained.
以上説明したように、本発明は溶融金属浴に堰部材を設
け、堰部材と断熱部材とによって溶融金属浴上部空間を
堰部材上流側空間と堰部材下流側空間とに分割し、上流
側空間の堰部材近傍における溶融ガラスの加熱を不要と
し、その結果堰部材近傍における泡の発生を抑制すると
ともに、堰部材をくぐり抜ける溶融ガラス粘度の不均質
に伴う筋の発生を抑制し、さらには堰部材の下流側表面
を上流側空間に悪影響を与えることなく冷却するように
し、堰部材と溶融ガラスとの離れを良化させることによ
り筋の発生をなくしたものである。As explained above, the present invention provides a weir member in a molten metal bath, and divides the upper space of the molten metal bath into an upstream space of the weir member and a downstream space of the weir member by the weir member and the heat insulating member. This eliminates the need to heat the molten glass near the weir member, thereby suppressing the generation of bubbles near the weir member, and suppressing the generation of streaks due to the non-uniformity of the viscosity of the molten glass passing through the weir member. The downstream surface of the weir is cooled without adversely affecting the upstream space, and streaks are eliminated by improving the distance between the weir member and the molten glass.
また、下流側空間の圧力が上流側空間の圧力よりも高く
なるように下流側空間に吹込まれた窒素および水素の混
合気体が堰部材と側壁との間隙を通り上流側空間に侵入
するようにして、ガラスリボンの耳部を選択的に冷却す
ることにより下流側空間におけるガラスリボンのりフロ
ート現象を抑制することができる。In addition, a gas mixture of nitrogen and hydrogen blown into the downstream space enters the upstream space through the gap between the weir member and the side wall so that the pressure in the downstream space is higher than the pressure in the upstream space. By selectively cooling the edges of the glass ribbon, it is possible to suppress the glass ribbon glue float phenomenon in the downstream space.
かくして本発明によれば、１朋以下の薄板ガラスを高い
品質で製造することができ、その実用的価値は大きい。Thus, according to the present invention, it is possible to produce thin glass of less than one size with high quality, and its practical value is great.
第１図は本発明を実施する場合に使用する装置の一例を
示す縦断面図、第２図は第１図の堰部材付近の水平断面
図、第３図は第１図の堰部材付近の横断面図、第４図は
第１図における堰部材および下流側空間部分の縦断面図
、第５図は本発明を実施する場合に使用する装置の他の
例を示す堰部材付近の縦断面図である。
１・・・・・・溶融ガラス、４・・・・・・溶融金属浴
、５・・・・・・底部耐火物、８・・・・・・溶溶金属
、Ｉ Ｑ、、、、、、堰部材、１１・・・・・・溶融ガ
ラスプール、１３・・・・・・断！、１４・・・・・・
補助断熱壁、１６・・・・・・堰部材上流側空間、１６
′・・・・・・加熱手段、１７・・四層部材下流側空間
、１７′・・・・・・冷却手段、１８・・・・・・側壁
、１８′曲・・間隙、２１・・・・・・配管、３１・・
・・・・耳部、３２・・曲ガシスリポン。FIG. 1 is a longitudinal sectional view showing an example of the apparatus used in carrying out the present invention, FIG. 2 is a horizontal sectional view of the vicinity of the weir member in FIG. 1, and FIG. 3 is a horizontal sectional view of the vicinity of the weir member in FIG. 1. 4 is a longitudinal sectional view of the weir member and downstream space portion in FIG. 1, and FIG. 5 is a longitudinal sectional view of the weir member vicinity showing another example of the device used in carrying out the present invention. It is a diagram. 1... Molten glass, 4... Molten metal bath, 5... Bottom refractory, 8... Molten metal, IQ,... Weir member, 11... Molten glass pool, 13... Break! , 14...
Auxiliary insulation wall, 16...Weir member upstream space, 16
'... Heating means, 17... Four-layer member downstream space, 17'... Cooling means, 18... Side wall, 18' Curve... Gap, 21... ...Piping, 31...
... Ears, 32... Song Gasisripon.
Claims (1)
上に溶融金属浴を横切って設けた堰部材により溶融ガラ
スの溜シを形成し、この溶融ガラスを堰部材と溶融金属
浴面との間を通過させ、堰部材と溶融金属浴出口との間
で伸延させるようにしだ板ガラスの製造方法において、
溶融金属浴上部空間を堰部材および堰部材に併設された
断熱部材によシ高混雰囲気の堰部材上流側空間と低温雰
囲気の堰部材下流側空間とに分割し、堰部材上流側空間
で溶融ガラスを均一加熱し、次いで溶融ガラスの堰部材
からはみ出る両端部を、堰部材下流側空間に供給されて
該空間から前記堰部材上流側空間に向って堰部材の両側
方を流れる窒素と水素の混合気体により冷却しながら溶
融ガラスの中央部を通過抵抗がその進行方向に向うに従
って増すようになされている堰部材と溶融金属浴との間
を通過させ、堰部材の下流側表面を冷却することによや
堰部材から離れようとする溶融ガラスを冷却するように
することを特徴とする板ガラスの製造方法。1. Molten glass is supplied onto the molten metal bath, a sump of molten glass is formed by a weir member provided across the molten metal bath surface on the molten metal bath surface, and this molten glass is transferred between the molten metal bath surface and the molten metal bath surface. In a method for manufacturing sheet glass, the glass plate is made to extend between the weir member and the molten metal bath outlet.
The space above the molten metal bath is divided into a space upstream of the weir member with a highly mixed atmosphere and a space downstream of the weir member with a low temperature atmosphere by the weir member and a heat insulating member attached to the weir member, and melting occurs in the space upstream of the weir member. The glass is uniformly heated, and then both ends of the molten glass protruding from the weir member are supplied to the downstream space of the weir member, and nitrogen and hydrogen flowing from the space to the upstream space of the weir member on both sides of the weir member. Cooling the molten glass with a gas mixture, the central part of the molten glass is passed between a weir member and a molten metal bath whose resistance to passage increases in the direction of movement of the molten glass, thereby cooling the downstream surface of the weir member. A method for producing plate glass, characterized by cooling molten glass that is about to leave a Yoya weir member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17719080A JPS5920607B2 (en) | 1980-12-17 | 1980-12-17 | Method of manufacturing plate glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17719080A JPS5920607B2 (en) | 1980-12-17 | 1980-12-17 | Method of manufacturing plate glass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57100922A JPS57100922A (en) | 1982-06-23 |
| JPS5920607B2 true JPS5920607B2 (en) | 1984-05-14 |
Family
ID=16026745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17719080A Expired JPS5920607B2 (en) | 1980-12-17 | 1980-12-17 | Method of manufacturing plate glass |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5920607B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0222542U (en) * | 1988-07-29 | 1990-02-15 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016153344A (en) * | 2013-06-20 | 2016-08-25 | 旭硝子株式会社 | Method and apparatus for manufacturing float glass, and float glass |
| DE102017124625A1 (en) * | 2016-12-22 | 2018-06-28 | Schott Ag | Thin glass substrate, method and apparatus for its manufacture |
-
1980
- 1980-12-17 JP JP17719080A patent/JPS5920607B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0222542U (en) * | 1988-07-29 | 1990-02-15 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57100922A (en) | 1982-06-23 |
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