JPH04198036A - Heating furnace for wire drawing of optical fiber - Google Patents
Heating furnace for wire drawing of optical fiberInfo
- Publication number
- JPH04198036A JPH04198036A JP32529590A JP32529590A JPH04198036A JP H04198036 A JPH04198036 A JP H04198036A JP 32529590 A JP32529590 A JP 32529590A JP 32529590 A JP32529590 A JP 32529590A JP H04198036 A JPH04198036 A JP H04198036A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- base material
- wire drawing
- heater
- 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.)
- Pending
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 28
- 238000010438 heat treatment Methods 0.000 title claims abstract description 27
- 238000005491 wire drawing Methods 0.000 title abstract description 9
- 238000000137 annealing Methods 0.000 claims abstract description 8
- 239000011521 glass Substances 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 abstract description 25
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000008646 thermal stress Effects 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 abstract 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000012681 fiber drawing Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000035882 stress Effects 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
- C03B2205/62—Heating means for drawing
- C03B2205/63—Ohmic resistance heaters, e.g. carbon or graphite resistance heaters
-
- 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
- C03B2205/62—Heating means for drawing
- C03B2205/69—Auxiliary thermal treatment immediately prior to drawing, e.g. pre-heaters, laser-assisted resistance heaters
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に用いる線引用加熱炉に
関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drawing heating furnace used for drawing optical fibers.
第2図は光ファイバの線引きに際して用いられる線引用
加熱炉の模式的断面図であり、加熱炉1は、その内部に
内蔵したカーボン製の線引用ヒータ2と、線引用ヒータ
2からの不純物が光ファイバに線引きする光フデイバ用
母材に付着するのを防ぐためのカーボンマフフル3と、
線引用ヒータ2の熱効率を高めるための断熱材4とから
構成されている。なお、同図において、11は光フアイ
バ用母材、12は線引きされた光ファイバである。FIG. 2 is a schematic cross-sectional view of a wire heating furnace used for drawing optical fibers. a carbon muffle 3 for preventing adhesion to the optical fiber base material used to draw the optical fiber;
It is composed of a heat insulating material 4 for increasing the thermal efficiency of the line heater 2. In the figure, 11 is an optical fiber base material, and 12 is a drawn optical fiber.
因みに、光ファイバの線引きは、加熱炉1内に上方から
下方へもしくは下方から上方へとヘリウム、アルゴン、
窒素ガス等あるいはこれらの混合ガスからなる不活性ガ
スを流しながら光フアイバ用母材11を一端から順次2
000℃以上に加熱して軸方向に下方に向かって引き落
としてなされ光ファイバ12が製造される。Incidentally, when drawing an optical fiber, helium, argon,
While flowing an inert gas such as nitrogen gas or a mixture thereof, the optical fiber base material 11 is sequentially heated from one end to 2.
The optical fiber 12 is manufactured by heating it to 000° C. or more and pulling it down in the axial direction.
光フアイバ用母材は、周知の如く多孔質母材を加熱して
透明ガラス化し固化させて透明なガラス母材として得ら
れるが、固化するときに均一に冷却固化されるとは限ら
ず、また、この透明な光フアイバ用母材の表面を火炎研
磨して表面を滑らかにしてのち線引きするが、このとき
の表面の加熱軟化及び固化が均一とは限らない、そのた
めに母材に応力歪が残留する。このような母材を線引き
するとき割れたりあるいは歪が残ったまま光ファイバに
なることがあるという問題がある。As is well known, the base material for optical fiber is obtained as a transparent glass base material by heating a porous base material to transparently vitrify and solidify it, but when solidifying, it is not always cooled and solidified uniformly. The surface of this transparent base material for optical fiber is flame polished to make the surface smooth and then wire is drawn, but the softening and solidification of the surface by heating at this time is not always uniform, and as a result, stress strain may occur in the base material. remain. When such a base material is drawn, there is a problem in that it may crack or become an optical fiber with residual distortion.
本発明は上記の如き課題を解決するためになされたもの
で、線引用ヒータを内蔵した光ファイバの線引用加熱炉
において、この線引用ヒータの上部側に、この線引用ヒ
ータよりも加熱温度の低い、即ちガラスの歪点よりも高
く軟化点よりも低い加熱温度のアニール用ヒータを内蔵
した構造の線引用加熱炉とするものである。The present invention has been made in order to solve the above-mentioned problems, and in an optical fiber line heating furnace with a built-in line drawing heater, a heating temperature higher than that of the line drawing heater is provided on the upper side of the line drawing heater. This is a line heating furnace having a built-in annealing heater with a low heating temperature, that is, higher than the strain point of glass and lower than its softening point.
上記の如き本発明の構造の線引用加熱炉を用いて母材を
加熱して線引きすると、母材はまずアニール用ヒータに
て加熱され、その温度がガラス歪点よりも高く軟化点よ
りも低いので、母材中に残留している歪が除去される。When a base material is heated and drawn using the drawing heating furnace having the structure of the present invention as described above, the base material is first heated by an annealing heater, and the temperature thereof is higher than the glass strain point and lower than the softening point. Therefore, residual strain in the base material is removed.
そして線引用ヒータにより母材の先端部が溶融して綿引
きされるので、線引中に母材が割れたり、歪みが残留し
たまま光ファイバとなることがない。Since the tip of the base material is melted and drawn by the wire drawing heater, the base material does not crack during drawing or become an optical fiber with residual distortion.
第1図は、本発明になる線引用加熱炉の模式的な断面図
であり、前記の第2図と同一部分番よ同一符号にて示し
てあり、加熱炉1八は、線引用ヒータ2、その上部側に
配設されたアユ−リレ用ヒータ5、カーボンマツフル3
及び断熱材4とから構成されている。線引用ヒータ2の
加熱温度は2000°C以上であるが、アニール用ヒー
タ5の加熱温度Gま力゛ラスの歪点1100°Cより高
く軟化点1300°Cより低くになるよう線引用ヒータ
2の加熱温度よりも低く設定しである。FIG. 1 is a schematic cross-sectional view of a line heating furnace according to the present invention, in which the same part numbers and symbols are used as in FIG. , Ayu-Relay heater 5 arranged on the upper side, Carbon Matsufuru 3
and a heat insulating material 4. Although the heating temperature of the line heater 2 is 2000°C or higher, the heating temperature of the annealing heater 5 is set so that the heating temperature G of the line heater 2 is higher than the strain point of 1100°C and lower than the softening point of 1300°C. Set it lower than the heating temperature.
光ファイバの線引きに際しては、前記従来例と同様に加
熱炉IAに不活性ガスを流しながら線引きするが、光フ
アイバ用母材11は、まずアニール用ヒータ5にて11
00〜1300°Cに加熱されると母材中の歪が除去さ
れ、母材11が徐々に下方に送り出されて先端部が線引
用ヒータ2により加熱さね7て熔融し下方に向かって線
引きされ、歪のなし)光ファイバ12が得られる。線引
中の母材の割れも認められなかった。When drawing an optical fiber, it is drawn while flowing an inert gas in the heating furnace IA as in the conventional example, but the optical fiber base material 11 is first heated in the annealing heater 5.
When heated to 00 to 1,300°C, the strain in the base material is removed, and the base material 11 is gradually fed downward, and the tip is heated by the wire drawing heater 2 to melt it and draw the wire downward. An optical fiber 12 (without distortion) is obtained. No cracks in the base material were observed during drawing.
本発明による光ファイバの線引用加熱炉を用(Aて光フ
ァイバの線引きを行えば、線引き前に母材中の歪がなく
なるので、線引中の母材に熱応力による割れが発生する
ことがなく、また歪のない光ファイバを製造することが
できる。If the optical fiber is drawn using the optical fiber drawing heating furnace according to the present invention (A), the strain in the base material will be eliminated before drawing, so cracks will not occur in the base material during drawing due to thermal stress. In addition, it is possible to manufacture optical fibers without distortion.
第1図は本発明による光ファイバの線引用加熱炉の模式
的断面図、第2図は従来の光ファイバの線引用加熱炉の
模式的断面図である。
1、IA:加熱炉、2:線引用ヒータ、5ニアニール用
ヒータ。FIG. 1 is a schematic sectional view of an optical fiber line heating furnace according to the present invention, and FIG. 2 is a schematic sectional view of a conventional optical fiber line heating furnace. 1. IA: heating furnace, 2: line drawing heater, 5 near annealing heater.
Claims (1)
において、前記線引用ヒータの上部側にガラスの歪点よ
りも高く軟化点よりも低い加熱温度のアニール用ヒータ
を内蔵していることを特徴とする光ファイバの線引用加
熱炉。1. In an optical fiber line heating furnace with a built-in line heater, an annealing heater with a heating temperature higher than the strain point of the glass and lower than its softening point is built into the upper side of the line heater. Features: Optical fiber line heating furnace.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32529590A JPH04198036A (en) | 1990-11-29 | 1990-11-29 | Heating furnace for wire drawing of optical fiber |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32529590A JPH04198036A (en) | 1990-11-29 | 1990-11-29 | Heating furnace for wire drawing of optical fiber |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH04198036A true JPH04198036A (en) | 1992-07-17 |
Family
ID=18175222
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP32529590A Pending JPH04198036A (en) | 1990-11-29 | 1990-11-29 | Heating furnace for wire drawing of optical fiber |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH04198036A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6134922A (en) * | 1997-06-19 | 2000-10-24 | Shin-Etsu Chemical Co., Ltd. | Method for drawing a glass ingot |
US6907757B2 (en) | 2001-02-21 | 2005-06-21 | Sumitomo Electric Industries, Ltd. | Drawing method of optical fiber and drawing furnace |
US6935139B2 (en) | 2001-05-14 | 2005-08-30 | Sumitomo Electric Industries | Method of manufacturing optical fiber |
US7155808B2 (en) * | 2003-08-05 | 2007-01-02 | Tdk Corporation | Method of making thin film magnetic head |
JP2009526732A (en) * | 2006-02-15 | 2009-07-23 | エルエス ケーブル リミテッド | A heater having a plurality of high temperature zones, a melting furnace for drawing an optical fiber from a preform of an optical fiber having the heater, and a method of drawing an optical fiber using the melting furnace |
CN108383375A (en) * | 2018-02-12 | 2018-08-10 | 江苏富春江光电有限公司 | Drawing optical fibers annealing device and optical fiber |
-
1990
- 1990-11-29 JP JP32529590A patent/JPH04198036A/en active Pending
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6134922A (en) * | 1997-06-19 | 2000-10-24 | Shin-Etsu Chemical Co., Ltd. | Method for drawing a glass ingot |
US6907757B2 (en) | 2001-02-21 | 2005-06-21 | Sumitomo Electric Industries, Ltd. | Drawing method of optical fiber and drawing furnace |
US6935139B2 (en) | 2001-05-14 | 2005-08-30 | Sumitomo Electric Industries | Method of manufacturing optical fiber |
US7155808B2 (en) * | 2003-08-05 | 2007-01-02 | Tdk Corporation | Method of making thin film magnetic head |
JP2009526732A (en) * | 2006-02-15 | 2009-07-23 | エルエス ケーブル リミテッド | A heater having a plurality of high temperature zones, a melting furnace for drawing an optical fiber from a preform of an optical fiber having the heater, and a method of drawing an optical fiber using the melting furnace |
CN108383375A (en) * | 2018-02-12 | 2018-08-10 | 江苏富春江光电有限公司 | Drawing optical fibers annealing device and optical fiber |
CN108383375B (en) * | 2018-02-12 | 2023-08-04 | 浙江富春江光电科技有限公司 | Optical fiber drawing annealing device and optical fiber |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR920000634A (en) | Selection method of optical fiber | |
JP2830990B2 (en) | Method for manufacturing double crucible made of quartz | |
JPH04198036A (en) | Heating furnace for wire drawing of optical fiber | |
EP0319374A3 (en) | Inert atmosphere cooler for optical fibers and method of using the same | |
JPH04270132A (en) | Production of glass matrix for optical fiber | |
JP6968213B2 (en) | High-strength welding process for producing heavy glass base materials with large cross-sectional areas | |
JP2006124235A (en) | Quartz glass crucible, method of manufacturing the same and application thereof | |
JP3606744B2 (en) | Heat resistant material and method for producing the same | |
JPS6197143A (en) | Device for preparing single polarization optical fiber | |
JPS5915091B2 (en) | Manufacturing method of fiber base material for optical communication | |
JPH02145452A (en) | Drawing of optical fiber | |
JP3819054B2 (en) | Method for forming terminal portion of optical fiber bundle | |
JPH07247133A (en) | Production of optical fiber preform | |
JP2891498B2 (en) | Dehydration sintering furnace | |
KR20010031525A (en) | Apparatus and method for drawing waveguide fibers | |
JPH0346602A (en) | Cutting method for optical fiber | |
JPS6251214B2 (en) | ||
JPS6212180B2 (en) | ||
JPH0582563B2 (en) | ||
JPS5641848A (en) | Manufacture of optical fiber base material | |
JPS63248731A (en) | Production of optical fiber base material | |
JPH0524874A (en) | Production of glass preform for optical fiber | |
JPH0623073B2 (en) | Optical fiber manufacturing method | |
JPH0815534A (en) | Crystalline fiber and its production | |
WO2005090244A1 (en) | Method for producing porous glass base material and glass base material for optical fiber |