JPH0283232A - Wire drawing of optical fiber - Google Patents
Wire drawing of optical fiberInfo
- Publication number
- JPH0283232A JPH0283232A JP23488488A JP23488488A JPH0283232A JP H0283232 A JPH0283232 A JP H0283232A JP 23488488 A JP23488488 A JP 23488488A JP 23488488 A JP23488488 A JP 23488488A JP H0283232 A JPH0283232 A JP H0283232A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- gas supply
- gas
- wire drawing
- supply port
- 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.)
- Pending
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 49
- 238000005491 wire drawing Methods 0.000 title abstract 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 239000000835 fiber Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 239000007789 gas Substances 0.000 abstract description 27
- 238000007711 solidification Methods 0.000 abstract description 9
- 230000008023 solidification Effects 0.000 abstract description 8
- 239000011261 inert gas Substances 0.000 abstract description 6
- 239000011159 matrix material Substances 0.000 abstract 2
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000012681 fiber drawing Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass 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
- C03B2205/90—Manipulating the gas flow through the furnace other than by use of upper or lower seals, e.g. by modification of the core tube shape or by using baffles
-
- 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
- C03B2205/90—Manipulating the gas flow through the furnace other than by use of upper or lower seals, e.g. by modification of the core tube shape or by using baffles
- C03B2205/92—Manipulating the gas flow through the furnace other than by use of upper or lower seals, e.g. by modification of the core tube shape or by using baffles using means for gradually reducing the cross-section towards the outlet or around the preform draw end, e.g. tapered
-
- 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
- C03B2205/90—Manipulating the gas flow through the furnace other than by use of upper or lower seals, e.g. by modification of the core tube shape or by using baffles
- C03B2205/98—Manipulating the gas flow through the furnace other than by use of upper or lower seals, e.g. by modification of the core tube shape or by using baffles using annular gas inlet distributors
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
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 drawing an optical fiber.
［従来技術］
従来、光ファイバの線引きは、第４図に示すように、加
熱炉１の炉体２内における上下の向きの炉芯管３内に光
ファイバ母材４をその軸心方向に沿って入れ、カーボン
等のヒータ５で該光ファイバ母材４を加熱すると共に、
ガス供給系路６を経て炉芯管３内にはその下部のガス供
給口６Ａから上部に不活性ガスを流し、炉内に空気が入
らないようにし、かかる状態で光ファイバ母材４から線
引きして光ファイバ７を製造していた。なお、８は光フ
ァイバ７の出口に設けられている空気侵入阻止用の絞り
蓋ある。[Prior Art] Conventionally, as shown in FIG. 4, optical fiber is drawn by inserting an optical fiber preform 4 into a vertically oriented furnace core tube 3 in a furnace body 2 of a heating furnace 1 in the axial direction. The optical fiber base material 4 is heated with a heater 5 made of carbon or the like, and
Inert gas is flowed from the lower gas supply port 6A into the upper part of the furnace core tube 3 through the gas supply line 6 to prevent air from entering the furnace, and in this state, the optical fiber is drawn from the optical fiber preform 4. The optical fiber 7 was manufactured using the same method. Note that reference numeral 8 denotes an aperture lid provided at the exit of the optical fiber 7 to prevent air from entering.
特に、下から上へガスを流すと、ダストを上に排出でき
るので、光ファイバ７にダストが付着せず、光ファイバ
７の強度が良くなる。In particular, when the gas flows from the bottom to the top, dust can be discharged upward, so that the dust does not adhere to the optical fiber 7 and the strength of the optical fiber 7 is improved.
光ファイバ７の外径変動を小さくするためには、炉芯管
３内に不活性ガスを定常的に流さなければならない。特
に、ガラスの溶融部分（光ファイバ母材４の変形開始位
置４Ａより下で光ファイバ７の固化形成位［７Ａまで）
は、その周囲にガスが乱れなく流れるようにしなくては
ならない。In order to reduce fluctuations in the outer diameter of the optical fiber 7, it is necessary to constantly flow an inert gas into the furnace core tube 3. In particular, the molten part of the glass (below the deformation start position 4A of the optical fiber base material 4 and the solidification position of the optical fiber 7 [up to 7A])
must allow gas to flow undisturbed around it.
［発明が解決しようとする課題１
しかしながら、従来の光ファイバの線引き方法では、線
速が例えば１２０ｍ／分程度では光ファイバフの固化形
成位置７Ａが炉芯管３内にあるが、線速が例えば２４０
ＴｒＬ／分程度になると光ファイバ７の固化形成位＠７
Ａが炉芯管３の外に飛び出すので、ガス供給口６Ａから
のガスが直接光ファイバ７の溶融部分に当り、温度変動
が生じ、ファイバ径が変動し易い問題点があった。[Problem to be Solved by the Invention 1] However, in the conventional optical fiber drawing method, when the drawing speed is, for example, about 120 m/min, the solidification formation position 7A of the optical fiber buff is within the furnace core tube 3; 240
When the temperature reaches about TrL/min, the solidification position of the optical fiber 7 @7
Since A jumps out of the furnace core tube 3, the gas from the gas supply port 6A directly hits the molten part of the optical fiber 7, causing temperature fluctuations and the problem that the fiber diameter tends to fluctuate.
本発明の目的は、ファイバ径の変動を防止して線引きを
行うことができる光ファイバの線引き方法を提供するこ
とにある。SUMMARY OF THE INVENTION An object of the present invention is to provide an optical fiber drawing method that can perform drawing while preventing variations in fiber diameter.
［３２題を解決するための手段］
上記の目的を達成するための本発明の詳細な説明すると
、本発明は、下部にガス供給口が設けられ、このガス供
給口により該下部から上部にガスが流されている加熱炉
内で光ファイバ母材を加熱しつつ線引きして光ファイバ
を製造する光ファイバの線引き方法において、前記光フ
ァイバの固化形成位置が前記ガス供給口より常時上に存
在するように該ガス供給口の位置を前記光ファイバの線
引き速度に応じて調整して線引きを行うことを特徴とす
る。[Means for Solving 32 Problems] To explain in detail the present invention for achieving the above object, the present invention has a gas supply port provided at the bottom, and the gas supply port supplies gas from the bottom to the top. In an optical fiber drawing method in which an optical fiber is produced by drawing an optical fiber preform while heating it in a heating furnace in which gas is flowing, the solidification formation position of the optical fiber is always above the gas supply port. The optical fiber is drawn by adjusting the position of the gas supply port according to the drawing speed of the optical fiber.
［作用コ
このようにして光ファイバの線引きを行うと、光ファイ
バの溶融部分にガスが直接光らなくなり、ファイバ径の
変動を防止できる。[Operation] When the optical fiber is drawn in this manner, the gas does not shine directly onto the molten portion of the optical fiber, and fluctuations in the fiber diameter can be prevented.
［実施例］
以下、本発明の実施例を第１図乃至第３図を参照して詳
細に説明する。本実施例では、光ファイバ７の線速が例
えば２４０ｍ ／分のときには、光ファイバ７の出口側
に炉芯管延長部３Ａを設け、これに対応して炉体延長部
２Ａを同心状に設け、これら炉芯管延長部３Ａと炉体延
長部２Ａとの間にガス供給糸路延長部６Ｂを設け、炉芯
管延長部３Ａの先端のガス供給口６Ａから炉芯管３内に
不活性ガスを供給する。[Example] Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 to 3. In this embodiment, when the linear speed of the optical fiber 7 is, for example, 240 m/min, the furnace core tube extension 3A is provided on the exit side of the optical fiber 7, and the furnace body extension 2A is provided concentrically in accordance with this. , a gas supply line extension part 6B is provided between the furnace core tube extension part 3A and the furnace body extension part 2A, and an inert gas is supplied into the furnace core tube 3 from the gas supply port 6A at the tip of the furnace core tube extension part 3A. Supply gas.
このようにして、線引きをすると、光ファイバ７の固化
形成位置７Ａがガス供給口６Ａより常に上に位置するこ
とになり、光ファイバ７の溶融部分に直接不活性ガスが
当らなくなる。When the optical fiber 7 is drawn in this manner, the solidification position 7A of the optical fiber 7 is always located above the gas supply port 6A, and the molten portion of the optical fiber 7 is not directly exposed to the inert gas.
第２図及び第３図は炉の延長の仕方の２種の例を示した
ものであり、第２図では１段延長の例、第３図は２段延
長の例を示したものである。１段目及び２段目の炉芯管
延長部３Ａ、３Ｂはねじ結合で延長接続がなされ、１段
目及び２段目の炉体延長部２Ａ、２Ｂはフランジ接続で
延長接続がなされるでいる。これらの接続段数は、光フ
ァイバ７の線引き速度に応じて、速ければ速いほど段数
を増加し、光ファイバ７０固化形成位置７Ａがガス供給
口６Ａの下にならないようにする。Figures 2 and 3 show two examples of how to extend the furnace. Figure 2 shows an example of one-stage extension, and Figure 3 shows an example of two-stage extension. . The first- and second-stage furnace core tube extensions 3A and 3B are connected by screw connections, and the first- and second-stage furnace body extensions 2A and 2B are connected by flanges. There is. The number of these connection stages is increased according to the drawing speed of the optical fiber 7, and the faster the drawing speed is, the more the number of stages is increased, so that the optical fiber 70 solidification formation position 7A is not located under the gas supply port 6A.
［発明の効果］
以上説明したように本発明に係る光ファイバの線引き方
法では、光ファイバの同化形成位置がガス供給口より常
時上に存在するように該ガス供給口の位置を該光ファイ
バの線引き速度に応じて調整して線引きするので、光フ
ァイバの溶融部分に直接ガスが当らないようになり、光
ファイバの外径変動を防止することができる。[Effects of the Invention] As explained above, in the optical fiber drawing method according to the present invention, the position of the gas supply port is adjusted so that the assimilation formation position of the optical fiber is always above the gas supply port. Since the drawing is performed while adjusting the drawing speed, gas does not directly hit the molten portion of the optical fiber, and fluctuations in the outer diameter of the optical fiber can be prevented.
第１図は本発明の方法を実施する加熱炉の一例の概略構
成を示すｔｌｉ断面図、第２図及び第３図は本発明にお
ける加熱炉の延長の仕方の２種の例を示す縦断面図、第
４図は従来の加熱炉の縦断面図である。
１・・・加熱炉、２・・・炉体、２Ａ、２Ｂ・・・炉体
延長部、３・・・炉芯管、３Ａ、３Ｂ・・・炉芯管延長
部、４・・・光ファイバ母材、５・・・ヒータ、６・・
・ガス供給系路、６Ａ・・・ガス供給口、７・・・光フ
ァイバ、７Ａ・・・固化形成位置。
第
図
第
図
第
図
第
図FIG. 1 is a tli cross-sectional view showing a schematic configuration of an example of a heating furnace for carrying out the method of the present invention, and FIGS. 2 and 3 are longitudinal cross-sectional views showing two examples of how to extend the heating furnace in the present invention. FIG. 4 is a longitudinal sectional view of a conventional heating furnace. DESCRIPTION OF SYMBOLS 1... Heating furnace, 2... Furnace body, 2A, 2B... Furnace body extension part, 3... Furnace core tube, 3A, 3B... Furnace core tube extension part, 4... Light Fiber base material, 5... Heater, 6...
- Gas supply system path, 6A... gas supply port, 7... optical fiber, 7A... solidification formation position. Figure Figure Figure Figure Figure
Claims (1)
該下部から上部にガスが流されている加熱炉内で光ファ
イバ母材を加熱しつつ線引きして光ファイバを製造する
光ファイバの線引き方法において、前記光ファイバの固
化形成位置が前記ガス供給口より常時上に存在するよう
に該ガス供給口の位置を前記光ファイバの線引き速度に
応じて調整して線引きを行うことを特徴とする光ファイ
バの線引き方法。A method of drawing an optical fiber in which an optical fiber base material is heated and drawn in a heating furnace in which a gas supply port is provided at the bottom and gas is flowed from the bottom to the top by the gas supply port to produce an optical fiber. The optical fiber is drawn by adjusting the position of the gas supply port according to the drawing speed of the optical fiber so that the solidified formation position of the optical fiber is always above the gas supply port. How to draw fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23488488A JPH0283232A (en) | 1988-09-21 | 1988-09-21 | Wire drawing of optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23488488A JPH0283232A (en) | 1988-09-21 | 1988-09-21 | Wire drawing of optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0283232A true JPH0283232A (en) | 1990-03-23 |
Family
ID=16977831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23488488A Pending JPH0283232A (en) | 1988-09-21 | 1988-09-21 | Wire drawing of optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0283232A (en) |
-
1988
- 1988-09-21 JP JP23488488A patent/JPH0283232A/en active Pending
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