JPH0260618B2 - - Google Patents
Info
- Publication number
- JPH0260618B2 JPH0260618B2 JP11409983A JP11409983A JPH0260618B2 JP H0260618 B2 JPH0260618 B2 JP H0260618B2 JP 11409983 A JP11409983 A JP 11409983A JP 11409983 A JP11409983 A JP 11409983A JP H0260618 B2 JPH0260618 B2 JP H0260618B2
- Authority
- JP
- Japan
- Prior art keywords
- fluid control
- control body
- glass
- glass plate
- slit
- 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
- 239000012530 fluid Substances 0.000 claims description 52
- 239000011521 glass Substances 0.000 claims description 48
- 238000000034 method Methods 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000006060 molten glass Substances 0.000 claims description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 6
- 229910052697 platinum Inorganic materials 0.000 claims description 3
- 229910001260 Pt alloy Inorganic materials 0.000 claims 1
- 239000011819 refractory material Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 239000000758 substrate Substances 0.000 description 7
- 101700004678 SLIT3 Proteins 0.000 description 5
- 102100027339 Slit homolog 3 protein Human genes 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 4
- 239000011449 brick Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 239000006063 cullet Substances 0.000 description 1
- 238000004031 devitrification Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Classifications
-
- 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
Description
【発明の詳細な説明】
本発明はガラス溶融槽に対して下方に向つてガ
ラス板を成形する方法及び装置の改良に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method and apparatus for forming a glass sheet downwardly relative to a glass melting tank.
溶融ガラスを、ガラス溶融槽の底部に設けられ
たスリツトを通過させてスリツト下方に設置され
た流体制御体に供給し、流体制御体両側面にそつ
て流下させ、流体制御体下端部において合流させ
て下方に向つてガラス板を成形する方法は、以前
より知られている。 The molten glass is passed through a slit provided at the bottom of the glass melting tank, supplied to a fluid control body installed below the slit, allowed to flow down along both sides of the fluid control body, and merged at the bottom end of the fluid control body. Methods of shaping glass sheets downwards have been known for some time.
これらの方法の１例（特公昭38−17820）をと
りあげ第４図を用いて説明すると、溶融槽１６で
溶融されたガラス素地１７は、スリツト１８の間
隙、及びスリツト出口と丸形流体制御体１９の間
隙、の調整により流量調整されながらスリツト部
を通過し、丸形流体制御体１９の上に供給され
る。 One example of these methods (Japanese Patent Publication No. 38-17820) will be explained with reference to FIG. The fluid passes through the slit portion while the flow rate is adjusted by adjusting the gap 19, and is supplied onto the round fluid control body 19.
そして、スリツト部を通過する際に、スリツト
の面のわずかな凹凸に対応した凹凸を表面に有す
るガラス素地は丸形流体制御体１９の両側をガラ
スの表面張力により表面状態の良化を行いながら
流れおちて、丸形流体制御体１９の下側において
良化された表面が各々外面となる様に合流する。
こうして合流したガラス素地２０は、ナールロー
ル２１により巾がせまくなる事を防止されながら
ひきぬきロール２２の引張り力により薄板化さ
れ、クーラー２３によつて冷却固化される。こう
して表面状態のある程度良好なガラス板材が成形
される。 When passing through the slit part, the glass base material, which has irregularities on its surface corresponding to the slight irregularities on the surface of the slit, improves the surface condition on both sides of the round fluid control body 19 by the surface tension of the glass. The flow falls and merges on the lower side of the round fluid control body 19 so that the improved surfaces become the respective outer surfaces.
The glass base material 20 thus merged is made into a thin plate by the tensile force of the cutting roll 22 while being prevented from becoming narrow by the knurl roll 21, and is cooled and solidified by the cooler 23. In this way, a glass plate material with a somewhat good surface condition is formed.
前記方法において、流体制御体に供給されるガ
ラス素地は、スリツト通過時に生じた表面欠点を
有するガラスが流体制御体表面上でガラスの表面
張力によりその欠点を回復できる程度の低い粘
度、従つて高い温度を有することが必要である。
しかしながらこの様な場合、ガラス素地供給量が
ガラス溶融槽の素地面高さの変動の影響などによ
り非常に不安定になりやすく、又そのためガラス
板の厚みが不均一になりやすいという欠点があつ
た。又流体制御体に沿つて流れるガラスのうち、
流体制御体表面近くのガラス部分の流れが他のガ
ラス部分に比して遅いため、流体制御体に接触す
るガラス部に失透などが生じやすく、板材の中央
部に欠点を持ちやすいという傾向を有していた。 In the method, the glass substrate supplied to the fluid control body has a low viscosity, and therefore a high It is necessary to have a temperature.
However, in such cases, the supply amount of glass substrate tends to be very unstable due to the influence of fluctuations in the height of the substrate surface of the glass melting tank, etc., and the disadvantage is that the thickness of the glass plate is likely to be uneven. . Also, among the glass flowing along the fluid control body,
Because the flow of the glass near the surface of the fluid control body is slower than that of other glass parts, devitrification tends to occur in the glass part that comes into contact with the fluid control body, which tends to cause defects in the center of the plate material. had.
本発明は前記現状に鑑みてなされたものであ
り、その目的は前記欠点を解消した溶融ガラスを
下方に引きぬいて板状に成形する方法及び装置を
提供することである。その要旨とするところは、
ガラス溶融槽底部のスリツト出口付近に高温度に
維持された、特にその上方のガラス温度よりも実
質的に高温度に維持された流体制御体を、その長
手方向の軸がスリツトの長手方向の中心軸と平行
になる様に設置し、スリツトを通過したガラス素
地が、該流体制御体の表面上で加熱されつつ両側
に分流され、該流体制御体の下部で再び合流する
様な流体制御体を設置することにある。 The present invention has been made in view of the above-mentioned current situation, and its object is to provide a method and apparatus for forming a plate by drawing molten glass downward, which eliminates the above-mentioned drawbacks. The gist of it is:
A fluid control body, which is maintained at a high temperature near the slit exit at the bottom of the glass melting tank, and in particular substantially higher than the glass temperature above it, is arranged so that its longitudinal axis is at the longitudinal center of the slit. A fluid control body is installed parallel to the axis, and the glass substrate passing through the slit is heated on the surface of the fluid control body, and the flow is split to both sides, and the flow is re-merged at the bottom of the fluid control body. It's about setting it up.
本発明をさらに詳細に図によつて説明すると、
第１図ないし第３図において、ガラス溶解槽１を
1350℃に保ちBK−７のガラスカレツト90Kgを10
時間溶融する。こうして均一化および泡ぬきされ
た溶融ガラス素地２は1100℃に冷却される。ガラ
ス溶解槽１の底部は、10mm巾400mm長さの水平ス
リツト３があけられ、かつ白金薄板８ａのまかれ
た耐火レンガが出来ている。スリツト３の下には
流体制御体４（上部円筒形部直径30mm，上下高さ
70mm，500mm長さ）がその上部がスリツト３の出
口に近接して、かつ流体制御体４の中心線が水平
となる様に取りつけられている。ここで流体制御
体４は、第３図の様なモリブデン中空円筒発熱体
５の外部にアルミナチユーブ６を被覆し、その下
部に耐火レンガ（材質アルミナ）をくさび状に加
工した部材７を取りつけ、アルミナチユーブ６お
よび部材７の外周を白金薄板８ｂで被覆した形状
をしている。又、流体制御体４中の発熱体５は、
流体制御体４の表面の長手方向の温度分布が一定
となる様に、その断面形状を調整されている。発
熱体５の両側にはターミナル９が設けられ、定電
流電源に接続されており、流体制御体４は1200℃
に加熱されている。又、流体制御体４は、ガラス
流量及び中心位置調整のため、可動支持装置１０
により垂直上下方向及びスリツトのスリツト巾方
向に可動状態に固定されている。スリツト３およ
び流体制御体４の間を通過したガラス素地は、流
体制御体４の周囲を流体制御体４よりの加熱を受
けて表面状態の良化を行いながら流下し、その下
部で合流し、ガラス板１１を形成する。ここで流
体制御体４の周囲には、流体制御体４上のガラス
素地の表面が過度に冷却されるのを防ぐために保
温用ヒーター１３が設けられている。こうして形
成されたガラス板１１は下方よりの引つ張り力に
より薄板に伸ばされながら冷却部１２に導かれ
る。 The present invention will be explained in more detail with the help of figures.
In Figures 1 to 3, the glass melting tank 1 is
10 pieces of BK-7 glass cullet 90kg kept at 1350℃
Time to melt. The molten glass base 2 thus homogenized and bubble-free is cooled to 1100°C. The bottom of the glass melting tank 1 is made of refractory bricks with a horizontal slit 3 having a width of 10 mm and a length of 400 mm and covered with platinum thin plates 8a. Below the slit 3 is a fluid control body 4 (upper cylindrical part diameter 30 mm, vertical height
70 mm and 500 mm in length) is installed so that its upper part is close to the outlet of the slit 3 and the center line of the fluid control body 4 is horizontal. Here, the fluid control body 4 has a molybdenum hollow cylindrical heating element 5 as shown in FIG. 3, the outside of which is coated with an alumina tube 6, and a wedge-shaped member 7 made of refractory brick (material: alumina) is attached to the lower part of the alumina tube 6. The outer circumferences of the alumina tube 6 and the member 7 are covered with a thin platinum plate 8b. Moreover, the heating element 5 in the fluid control body 4 is
The cross-sectional shape of the fluid control body 4 is adjusted so that the temperature distribution in the longitudinal direction on the surface of the fluid control body 4 is constant. Terminals 9 are provided on both sides of the heating element 5, which is connected to a constant current power supply, and the fluid control element 4 is heated to 1200°C.
is heated to. The fluid control body 4 also has a movable support device 10 for adjusting the glass flow rate and center position.
It is fixed in a movable state in the vertical vertical direction and in the slit width direction of the slit. The glass substrate that has passed between the slit 3 and the fluid control body 4 flows down around the fluid control body 4 while being heated by the fluid control body 4 to improve its surface condition, and merges at the lower part thereof. A glass plate 11 is formed. Here, a heat-retaining heater 13 is provided around the fluid control body 4 in order to prevent the surface of the glass substrate on the fluid control body 4 from being excessively cooled. The glass plate 11 thus formed is guided to the cooling section 12 while being stretched into a thin plate by a pulling force from below.
同時にガラス板の両端は、表面に凹凸のある１
対の回転ロール１４（ナールロール）にはさまれ
てガラス板の巾が狭くなつていく事が防止されて
いる。ガラス板１１は十分に冷却され変形をおこ
さなくなつた部分で引張りロール１５により下方
へ引つ張られている。 At the same time, both ends of the glass plate have uneven surfaces.
The width of the glass plate is prevented from becoming narrower because it is sandwiched between a pair of rotating rolls 14 (knurled rolls). The glass plate 11 is pulled downward by a tension roll 15 at a portion that has been sufficiently cooled and no longer deformed.
成形されるガラスの板厚は、流体制御体４とス
リツト３との間隔、下方よりの引張り力、溶融槽
のガラス素地温度、流体制御体の温度、周囲雰囲
気の温度（冷却速度）等の要素により可変であ
る。本装置及び本方法で前記各設定値を調整する
ことにより、板厚１mm板巾300mmの表面状態良好
なガラス板を成形することが出来た。 The thickness of the glass to be formed depends on factors such as the distance between the fluid control body 4 and the slit 3, the pulling force from below, the temperature of the glass substrate in the melting tank, the temperature of the fluid control body, and the temperature of the surrounding atmosphere (cooling rate). It is variable depending on By adjusting each of the above-mentioned setting values using this apparatus and this method, it was possible to form a glass plate with a thickness of 1 mm and a width of 300 mm and a good surface condition.
本発明では、流体制御体に温度の低いガラスを
供給しても、流体制御体に加熱装置を設けてある
ので、この加熱装置を用いて流体制御体上のガラ
スを、流体制御体表面上で表面張力による表面良
化を行える程度の温度に加熱する事が出来、その
ため従来法とくらべて温度の低い（粘度の高い）
ガラスを流体制御体に供給することが出来るとい
う利点を持つ。又この利点により、従来法におけ
るガラス供給量の変動を改善出来、それにより板
厚をより安定化出来る。又流体制御体からの熱に
よつて、流体制御体に接したガラスは失透しにく
くなり、ガラス板中央部の欠点が従来法とくらべ
減少する。 In the present invention, even if low-temperature glass is supplied to the fluid control body, since the fluid control body is provided with a heating device, this heating device is used to heat the glass on the fluid control body on the surface of the fluid control body. It can be heated to a temperature that improves the surface due to surface tension, so the temperature is lower (higher viscosity) compared to conventional methods.
It has the advantage that glass can be supplied to the fluid control body. This advantage also makes it possible to improve the fluctuations in the amount of glass supplied in the conventional method, thereby making it possible to further stabilize the plate thickness. In addition, the heat from the fluid control body makes it difficult for the glass in contact with the fluid control body to devitrify, and defects in the center of the glass plate are reduced compared to the conventional method.
第１図は本発明の方法によるガラス板成形装置
を横方向から見た時の断面図、第２図は同正面方
向から見た１部断面を含む側面図、第３図は本発
明の方法による流体制御体の断面図、第４図は従
来法に見られるガラス板成形装置の断面図であ
る。
３：スリツト、４：流体制御体、５：中空ヒータ
ー、１３：保温用ヒーター。
FIG. 1 is a cross-sectional view of a glass plate forming apparatus according to the method of the present invention when viewed from the side, FIG. 2 is a side view including a partial cross section as seen from the front, and FIG. 3 is a method according to the present invention. FIG. 4 is a sectional view of a glass plate forming apparatus according to the conventional method. 3: Slit, 4: Fluid control body, 5: Hollow heater, 13: Heat retention heater.
Claims (1)
トを通過させてスリツト下方に設置された流体制
御体上部に供給し、流体制御体両面にそつて流下
させ、流体制御体下端部において合流させてガラ
ス板を成形する方法において、前記流体制御体の
表面のすくなくとも一部分を高温度に保持し流体
制御体にそつて流れる溶融ガラスを流体制御体に
よつて加熱する事を特徴とするガラスの成形方
法。 ２ 溶融ガラスを、溶解槽の底部に設けたスリツ
トを通過させてスリツト下方に設置された流体制
御体上部に供給し、流体制御体両側面にそつて流
下させ、流体制御体下端部において合流させてガ
ラス板を成形する装置において、前記流体制御体
が内部に電気抵抗加熱体を有することを特徴とす
るガラス板の成形装置。 ３ 前記流体制御体が、垂直上下方向に移動可能
である特許請求範囲第２項記載のガラス板の成形
装置。 ４ 前記流体制御体の断面形状が逆水滴形状であ
る特許請求範囲第２項または第３項記載のガラス
板の成形装置。 ５ 前記流体制御体が、電気抵抗加熱体を耐火物
で囲みその表面を白金又は白金合金薄板で被覆し
たものである特許請求範囲第２項ないし第４項記
載のガラス板の成形装置。 ６ 前記流体制御体の発熱部が流体制御体内部の
上方部分に設けられている特許請求範囲第２項な
いし第５項記載のガラス板の成形装置。[Scope of Claims] 1. Molten glass is passed through a slit provided at the bottom of a melting tank, is supplied to the upper part of a fluid control body installed below the slit, and is caused to flow down along both sides of the fluid control body. A method of forming a glass plate by merging at a lower end portion, characterized in that at least a part of the surface of the fluid control body is maintained at a high temperature, and the molten glass flowing along the fluid control body is heated by the fluid control body. A method of forming glass. 2. The molten glass is passed through a slit provided at the bottom of the melting tank, is supplied to the upper part of the fluid control body installed below the slit, is allowed to flow down along both sides of the fluid control body, and is merged at the bottom end of the fluid control body. 1. An apparatus for forming a glass plate, characterized in that the fluid control body has an electric resistance heating body inside. 3. The glass plate forming apparatus according to claim 2, wherein the fluid control body is vertically movable. 4. The glass plate forming apparatus according to claim 2 or 3, wherein the fluid control body has a cross-sectional shape of an inverted water droplet. 5. The glass plate forming apparatus according to claims 2 to 4, wherein the fluid control body is an electric resistance heating body surrounded by a refractory material whose surface is coated with a platinum or platinum alloy thin plate. 6. The glass plate forming apparatus according to claims 2 to 5, wherein the heat generating part of the fluid control body is provided in an upper portion inside the fluid control body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11409983A JPS6011235A (en) | 1983-06-24 | 1983-06-24 | Method and device for forming glass plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11409983A JPS6011235A (en) | 1983-06-24 | 1983-06-24 | Method and device for forming glass plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6011235A JPS6011235A (en) | 1985-01-21 |
| JPH0260618B2 true JPH0260618B2 (en) | 1990-12-17 |
Family
ID=14629084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11409983A Granted JPS6011235A (en) | 1983-06-24 | 1983-06-24 | Method and device for forming glass plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6011235A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10305141A1 (en) * | 2003-02-08 | 2004-08-19 | Eglass Platinum Technology Gmbh | Device for preparation of thin flat glass consisting of a hollow body of contracted lower cross-section and a devitrification prevention heat source useful for production of Flat-Panel-Displays or storage medium plates |
| JP2010143800A (en) | 2008-12-19 | 2010-07-01 | Nippon Electric Glass Co Ltd | Apparatus for producing glass plate |
| TW201444772A (en) * | 2013-05-31 | 2014-12-01 | Fortune Tech Man Corp | Composite glass molding system |
| CN104230148A (en) * | 2013-06-07 | 2014-12-24 | 富荞企业管理顾问有限公司 | Composite type glass molding system |
-
1983
- 1983-06-24 JP JP11409983A patent/JPS6011235A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6011235A (en) | 1985-01-21 |
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