JPS63310746A - Sealing method for optical fiber drawing heating furnace - Google Patents
Sealing method for optical fiber drawing heating furnaceInfo
- Publication number
- JPS63310746A JPS63310746A JP14460187A JP14460187A JPS63310746A JP S63310746 A JPS63310746 A JP S63310746A JP 14460187 A JP14460187 A JP 14460187A JP 14460187 A JP14460187 A JP 14460187A JP S63310746 A JPS63310746 A JP S63310746A
- Authority
- JP
- Japan
- Prior art keywords
- base material
- inlet
- optical fiber
- seal plate
- heating furnace
- 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.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 27
- 239000013307 optical fiber Substances 0.000 title claims abstract description 13
- 238000012681 fiber drawing Methods 0.000 title claims abstract description 8
- 238000007789 sealing Methods 0.000 title claims description 12
- 238000000034 method Methods 0.000 title claims description 10
- 239000000463 material Substances 0.000 claims abstract description 43
- 230000000717 retained effect Effects 0.000 abstract 2
- 230000003287 optical effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 3
- 238000005491 wire drawing Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000010953 base metal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/029—Furnaces therefor
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/60—Optical fibre draw furnaces
- C03B2205/80—Means for sealing the preform entry or upper end of the furnace
- C03B2205/81—Means for sealing the preform entry or upper end of the furnace using gas
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は光ファイバの線引き加熱炉のシール方法に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of sealing an optical fiber drawing furnace.
石英系光ファイバの製造は、光ファイバと導波構造が相
似な棒状ガラス母材（プリフォーム）を合成する工程と
、その母材をファイバに線引きする工程からなる。各種
方法で合成される母材は外径が２０ｍｍ程度であり、線
引きされて外径が１００〜１５０−で長さが数ｈ〜数十
論のファイバになる。Manufacturing a silica-based optical fiber consists of a step of synthesizing a rod-shaped glass preform (preform) with a similar waveguide structure to that of the optical fiber, and a step of drawing the preform into a fiber. The base material synthesized by various methods has an outer diameter of about 20 mm, and is drawn into a fiber with an outer diameter of 100 to 150 mm and a length of several hours to several tens of degrees.
線引き工程では、寸法精度が良く長手方向に均一な細線
化技術が重要である。In the wire drawing process, it is important to have a thinning technique that has good dimensional accuracy and is uniform in the longitudinal direction.
線引き装置は母材送部、加熱炉、線径測定器、−次被覆
部、キャプスタン、ドラムから構成される。加熱炉には
高周波誘導炉や抵抗炉が用いられている。The wire drawing device consists of a base material feeding section, a heating furnace, a wire diameter measuring device, a secondary coating section, a capstan, and a drum. A high frequency induction furnace or a resistance furnace is used as a heating furnace.
第２図において、母材（１１の加熱炉体（４）への送込
速度は数ｎｍ／ｍｉｎであり、局部的に軟化したガラス
は微弱な下向きの張力によって紡すい形になり、その先
端から下方に数＋ｍ／ｍｉｎの速度で糸状に引出される
。母材（１）が炉壁と接触して傷がつくことを防ぐため
に、母材（１）と炉上部入口（７）との間には若干のク
リアランスが設けられており、炉内を外気からシールす
るために、ガス供給口（６）から不活性ガスが吹き出し
ている。母材（１）を炉加熱部へ送り込むため、母材（
１）上部に支持ロット（２）を継き゛たし、支持ロッド
（２）をロッドキャンチャ（３）でつかんでいる。この
支持ロッド（２）の径は経済的理由と重量軽減のため、
母材径に比べて細くすることが望ましい。In Fig. 2, the feeding speed of the base material (11) to the heating furnace body (4) is several nm/min, and the locally softened glass becomes a spindle shape due to the weak downward tension, and the tip In order to prevent the base material (1) from coming into contact with the furnace wall and causing damage, the base material (1) and the furnace upper inlet (7) are A slight clearance is provided between them, and inert gas is blown out from the gas supply port (6) in order to seal the inside of the furnace from outside air.In order to feed the base material (1) to the furnace heating section, Base material (
1) A support rod (2) is connected to the upper part, and the support rod (2) is gripped by a rod cancher (3). The diameter of this support rod (2) is determined for economic reasons and weight reduction.
It is desirable to make it thinner than the base material diameter.
しかしながら、上記のように径の異なる母材と支持ロッ
トが継がれているため、この継ぎ部分が炉上部入Ｌ１よ
り下にくると炉上部入口とのクリアランスが大きくなり
、ガスの流出圧力が減少して炉の外気からのシール性を
維持することが困難になるという問題が生じる。However, as mentioned above, since the base metal and the support rod with different diameters are joined, when this joint part comes below the furnace upper inlet L1, the clearance with the furnace upper inlet increases, and the gas outflow pressure decreases. A problem arises in that it becomes difficult to maintain the sealing performance of the furnace from the outside air.
本発明は以上のような点にかんがみてなされたもので、
その目的とするところは、加熱炉上部入口のシール性を
よくするため、径の異なる母材と支持ロットが炉上部入
口を通過する際に、そのクリアランスが一定になる加熱
炉のシール方法を提供することにある。The present invention has been made in view of the above points.
The purpose is to provide a heating furnace sealing method that maintains a constant clearance when base materials and support lots of different diameters pass through the furnace upper inlet in order to improve the sealing performance of the upper inlet of the furnace. It's about doing.
上記目的を達成するために本発明によれば、母材に該母
材より径の小さい支持ロットを継ぎ、該支持ロットによ
り母材を加熱炉内に送込み線引きする光ファイバ線引き
加熱炉において、母材と加熱炉体上部入口とのクリアラ
ンスと同程度のクリアランスを支持ロットとの間にもつ
穴と、加熱炉体上部入口の内径より大きい外径を有する
シール板の、前記穴に支持ロットを通し、前記シール板
を母材と支持ロッドの継ぎ部分で保持し、線引きする・
ことを特徴とする光ファイバ線引き加熱炉のシール方法
が提供される。In order to achieve the above object, the present invention provides an optical fiber drawing and heating furnace in which a support rod having a diameter smaller than that of the base material is connected to the base material, and the base material is fed into the heating furnace using the support rod for wire drawing. A support rod is inserted into the hole of the sealing plate, which has a clearance between the base material and the support rod that is comparable to the clearance between the base material and the upper inlet of the heating furnace body, and an outer diameter that is larger than the inner diameter of the upper inlet of the heating furnace body. Hold the seal plate at the joint between the base material and the support rod, and draw the line.
A method for sealing an optical fiber drawing furnace is provided.
母材とこれより径の小さい支持ロットとの継ぎ部分が加
熱炉上部入口までくると、この継ぎ部分に保持されたシ
ール板が、上記加熱炉上部入口をふさぎ、ガスがシール
板の穴と支持ロットの間のクリアランスを通して外部へ
放出され、ガスの放出圧が母材の位置に関係なくほぼ一
定に保たれる。When the joint between the base material and the support rod with a smaller diameter reaches the upper inlet of the heating furnace, the seal plate held at this joint closes the upper inlet of the heating furnace, and gas flows through the hole in the seal plate and the support rod. The gas is released to the outside through the clearance between the lots, and the gas release pressure is kept almost constant regardless of the position of the base material.
以下本発明の一実施例を図面により詳細に説明する。 An embodiment of the present invention will be described in detail below with reference to the drawings.
第１図ａ、ｂは本発明による加熱炉のレール方法を説明
する図である。母材（１）と加熱炉上部入口（７）の内
壁との間には小さなりリアランスをとり、接触により母
材に傷が生じるのを防止する。炉体上部のシール板（８
）は、外径が炉体上部入口（７）の内径より大きく、か
つ中央に穴を有し、その穴の径は支持ロット（２）との
クリアランスが前記母材（１）と加熱炉上部人口（７）
のクリアランスと同程度になるように定められている。FIGS. 1a and 1b are diagrams illustrating a heating furnace rail method according to the present invention. A small clearance is provided between the base material (1) and the inner wall of the upper inlet of the heating furnace (7) to prevent damage to the base material due to contact. Seal plate on top of furnace body (8
) has an outer diameter larger than the inner diameter of the upper furnace body inlet (7) and has a hole in the center, and the diameter of the hole is such that the clearance between the support rod (2) and the base material (1) and the upper part of the heating furnace Population (7)
The clearance is set to be approximately the same as that of the
シール板（８）は、その穴に支持ロット（２）を通して
、支持ロッド（２）と母材（１）の継ぎ目である肩の部
分に保持される。このような状態で、支持ロット（２）
をロッドキャッチャ（３）でつかみ、第１図ａに示すよ
うに、母材（１）を加熱炉体内に導入する。母材が炉上
部入口（７）を通過している間は、ガス供給口（６）か
らのガスは母材（１）と炉上部入口（７）とのクリアラ
ンスを通して外部へ放出される。支持ロット（２）と母
材（１）の継ぎ部分が炉上部入口より下にくると、第１
図すに示すように、シール板（８）が炉上部入口をふさ
ぎ、ガスはシール板（８）の穴と支持ロット（２）の間
のクリアランスを通して外部へ放出される。従って、ガ
スの放出圧は母材（１）の位置にかかわらずほぼ一定で
あり、外気の加熱炉内への流入を防ぐことができる。The seal plate (8) is held at the shoulder portion, which is the joint between the support rod (2) and the base material (1), by passing the support rod (2) through the hole. In this condition, support lot (2)
is grasped by the rod catcher (3), and the base material (1) is introduced into the heating furnace as shown in FIG. 1a. While the base material passes through the furnace upper inlet (7), gas from the gas supply port (6) is discharged to the outside through the clearance between the base material (1) and the furnace upper inlet (7). When the joint between the support rod (2) and the base material (1) is below the furnace upper inlet, the first
As shown in the figure, a sealing plate (8) closes the upper furnace inlet, and gas is released to the outside through the clearance between the hole in the sealing plate (8) and the support rod (2). Therefore, the gas discharge pressure is approximately constant regardless of the position of the base material (1), and it is possible to prevent outside air from flowing into the heating furnace.
以上説明したように本発明によれば、母材と加熱炉体上
部入口とのクリアランスと同程度のクリアランスを支持
ロットとの間にもつ穴と、加熱炉体上部人口の内径より
大きい外径を有するシール板の、前記穴に支持ロットを
通し、前記シール板を母材と支持ロットの継ぎ部分で保
持し、線引きするため、支持ロッド径を母材に比して相
対的に小さくでき、かつ加熱炉上部への外気流入のシー
ル性を改善することができるという優れた効果がある。As explained above, according to the present invention, the hole has a clearance between the base material and the support rod that is comparable to the clearance between the upper inlet of the heating furnace body, and an outer diameter larger than the inner diameter of the upper part of the heating furnace body. The support rod is passed through the hole of the seal plate having the seal plate, and the seal plate is held at the joint between the base material and the support rod, and the wire is drawn. This has the excellent effect of improving the sealing performance of outside air flowing into the upper part of the heating furnace.
第１１２１ａ、ｂは本発明にかかる加熱炉のシール方法
の説明図であり、ａは母材と支持ロットの継ぎ部分が炉
入口より上にある場合、ｂは前記継ぎ部分が炉入口より
下にある場合である。第２図は従来の光ファイバの線引
き加熱炉の要部断面図を示す。
１・・・母材、 ２・・・支持ロッド、 ３・・・ロッ
ドキャッチャ、 ４・・・加熱炉体、 ５・・・ヒータ
、 ６・・・ガス供給口、 ７・・・炉上部入口、 ８
・・・シール板。1121a and 1121b are explanatory diagrams of the heating furnace sealing method according to the present invention, in which a shows a case in which the joint part between the base material and the support rod is above the furnace inlet, and b shows a case in which the joint part between the base material and the support rod is below the furnace inlet. In some cases. FIG. 2 shows a sectional view of a main part of a conventional optical fiber drawing and heating furnace. DESCRIPTION OF SYMBOLS 1...Base metal, 2...Support rod, 3...Rod catcher, 4...Heating furnace body, 5...Heater, 6...Gas supply port, 7...Furnace upper inlet , 8
...Seal plate.
Claims (1)
ロッドにより母材を加熱炉内に送込み線引きする光ファ
イバ線引き加熱炉において、母材と加熱炉体上部入口と
のクリアランスと同程度のクリアランスを支持ロッドと
の間にもつ穴と、加熱炉体上部入口の内径より大きい外
径を有するシール板の、前記穴に支持ロッドを通し、前
記シール板を母材と支持ロッドの継ぎ部分で保持し、線
引きすることを特徴とする光ファイバ線引き加熱炉のシ
ール方法。In an optical fiber drawing furnace, in which a support rod with a smaller diameter than the base material is connected to the base material, and the base material is fed into the heating furnace by the support rod and drawn, the clearance between the base material and the upper inlet of the heating furnace body is the same as that of the base material. The support rod is passed through the hole of the seal plate which has a clearance between the support rod and the support rod, and the seal plate has an outer diameter larger than the inner diameter of the upper inlet of the heating furnace body, and the seal plate is inserted into the joint between the base material and the support rod. A sealing method for an optical fiber drawing furnace, which is characterized by holding and drawing an optical fiber in parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14460187A JPH08710B2 (en) | 1987-06-10 | 1987-06-10 | Sealing method for optical fiber drawing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14460187A JPH08710B2 (en) | 1987-06-10 | 1987-06-10 | Sealing method for optical fiber drawing furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63310746A true JPS63310746A (en) | 1988-12-19 |
| JPH08710B2 JPH08710B2 (en) | 1996-01-10 |
Family
ID=15365830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14460187A Expired - Fee Related JPH08710B2 (en) | 1987-06-10 | 1987-06-10 | Sealing method for optical fiber drawing furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08710B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01197342A (en) * | 1988-02-02 | 1989-08-09 | Sumitomo Electric Ind Ltd | Production of optical fiber |
| JPH03126634A (en) * | 1989-10-12 | 1991-05-29 | Furukawa Electric Co Ltd:The | Production of optical fiber |
| FR2739374A1 (en) * | 1995-09-29 | 1997-04-04 | Samsung Electronics Co Ltd | Optical fibre spinning furnace - having inlet and outlet apertures, heater for optical fibre preform, means for establishing inert gas flow within furnace, and inlet sleeve in which inlet aperture is formed and having inner surface projections and/or indentations |
| EP2022766A2 (en) | 2007-08-10 | 2009-02-11 | Shin-Etsu Chemical Company, Ltd. | An apparatus for fabricating an optical fiber and a method for sealing a drawing furnace |
-
1987
- 1987-06-10 JP JP14460187A patent/JPH08710B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01197342A (en) * | 1988-02-02 | 1989-08-09 | Sumitomo Electric Ind Ltd | Production of optical fiber |
| JPH03126634A (en) * | 1989-10-12 | 1991-05-29 | Furukawa Electric Co Ltd:The | Production of optical fiber |
| FR2739374A1 (en) * | 1995-09-29 | 1997-04-04 | Samsung Electronics Co Ltd | Optical fibre spinning furnace - having inlet and outlet apertures, heater for optical fibre preform, means for establishing inert gas flow within furnace, and inlet sleeve in which inlet aperture is formed and having inner surface projections and/or indentations |
| EP2022766A2 (en) | 2007-08-10 | 2009-02-11 | Shin-Etsu Chemical Company, Ltd. | An apparatus for fabricating an optical fiber and a method for sealing a drawing furnace |
| EP2022766A3 (en) * | 2007-08-10 | 2011-03-23 | Shin-Etsu Chemical Company, Ltd. | An apparatus for fabricating an optical fiber and a method for sealing a drawing furnace |
| US8322165B2 (en) | 2007-08-10 | 2012-12-04 | Shin-Etsu Chemical Co., Ltd. | Apparatus for fabricating an optical fiber |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08710B2 (en) | 1996-01-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |