JPH0314790B2 - - Google Patents
Info
- Publication number
- JPH0314790B2 JPH0314790B2 JP7230484A JP7230484A JPH0314790B2 JP H0314790 B2 JPH0314790 B2 JP H0314790B2 JP 7230484 A JP7230484 A JP 7230484A JP 7230484 A JP7230484 A JP 7230484A JP H0314790 B2 JPH0314790 B2 JP H0314790B2
- Authority
- JP
- Japan
- Prior art keywords
- preform
- optical fiber
- impurities
- heating furnace
- fiber
- 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 - Lifetime
Links
- 239000013307 optical fiber Substances 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000012681 fiber drawing Methods 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 2
- 239000000835 fiber Substances 0.000 description 12
- 239000007789 gas Substances 0.000 description 11
- 239000012535 impurity Substances 0.000 description 11
- 150000002500 ions Chemical class 0.000 description 5
- 230000005611 electricity Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010998 test method Methods 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
- C03B2205/80—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
-
- 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
- C03B2205/98—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)
Description
【発明の詳細な説明】
〔発明の背景と目的〕
本発明は、光フアイバの線引方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION [Background and Objects of the Invention] The present invention relates to a method of drawing optical fiber.
光フアイバは、低損失、製造容易などのすぐれ
た利点を有し、近時、通信用ケーブルとして広範
囲に使用されている。その製造方法は、ガラス母
材となるプリフオームを加熱炉に供給し、これを
溶融軟化して線引きするというものであるが、光
フアイバを実際に製造する場合、最も重要な要件
の１つとして、如何にすればフアイバそのものの
強度を大きくとれるかということがある。光フア
イバの強度向上化をはかるべく、各種研究・開発
が日夜おこなわれているが、フアイバの耐用性を
大きくするためには、当該フアイバに或る一定値
以上の初期強度をもたせればよいことが判つてい
る。現在、光フアイバが或る一定値以上の初期強
度を有しているか否かを判別する方法としては、
フアイバの線引と同時、あるいはフアイバ外周に
対する保護被覆層の押出に際し、これらフアイバ
の全長にわたつて一定荷重を与え、断線したフア
イバを取り除くという、いわゆるプルーフ試験法
が採用されている。しかして、フアイバ強度にバ
ラツキを生ずる原因としては、まず、プリフオー
ム自信に内在する気泡や傷が挙げられるが、これ
以外に、プリフオームの表面に付着している不純
物が当該プリフオームとともに加熱炉に供給さ
れ、高温に加熱されてプリフオームと反応するこ
とにより、フアイバ表面に新たな欠陥を生ずると
いう場合があり、これがフアイバ断線原因の大半
を占めている。 Optical fibers have excellent advantages such as low loss and ease of manufacture, and have recently been widely used as communication cables. The manufacturing method involves feeding a preform, which serves as a glass base material, into a heating furnace, melting it, softening it, and drawing it. However, when actually manufacturing optical fibers, one of the most important requirements is: There is a question of how to increase the strength of the fiber itself. Various research and developments are being carried out day and night to improve the strength of optical fibers, but in order to increase the durability of fibers, it is sufficient to give the fibers an initial strength above a certain value. is known. Currently, the methods for determining whether or not an optical fiber has an initial strength above a certain value are as follows:
A so-called proof test method is used in which a constant load is applied over the entire length of the fibers and broken fibers are removed at the same time as the fibers are drawn or when a protective coating layer is extruded around the fiber periphery. The causes of variations in fiber strength include air bubbles and scratches inherent in the preform itself, but also impurities attached to the surface of the preform that are supplied to the heating furnace together with the preform. When the fiber is heated to a high temperature and reacts with the preform, new defects may be generated on the fiber surface, which accounts for most of the causes of fiber breakage.
以上の点を考慮して、従来、フアイバ線引装置
全体に覆いをつけ、この覆いのなかに清浄な空気
を送り込む試みもなされているが、プリフオーム
は絶縁性が高く、非常に帯電しやすい素材である
ため、線引装置内で微小不純物が発生すると、当
該微小不純物がプリフオームに吸い寄せられ当該
プリフオームの表面に静電気的に強固に付着して
しまうため、期待される程の実効を奏し得ないと
いうのが実情である。 In consideration of the above points, attempts have been made to cover the entire fiber drawing equipment and send clean air into the cover, but the preform is made of a material with high insulating properties and is easily charged. Therefore, if minute impurities are generated in the drawing equipment, the minute impurities will be attracted to the preform and firmly adhere to the surface of the preform, making it impossible to achieve the expected effectiveness. That is the reality.
本発明は、以上の点を考慮してなされたもので
あつて、その目的とするところは、プリフオーム
の表面に不純物が付着している場合であつても、
これら不純物を従来とは全く異なる方法で確実に
除去し、ひいては低荷重域で断線することの少な
い光フアイバの線引方法を提供しようとするもの
である。 The present invention has been made in consideration of the above points, and its purpose is to eliminate the problem even when impurities are attached to the surface of the preform.
The present invention aims to provide an optical fiber drawing method that reliably removes these impurities using a method that is completely different from conventional methods and that is less likely to break in a low load range.
上記目的を達成するため、本発明は、光フアイ
バのプリフオームの加熱炉に供給し、これを溶融
軟化して線引きする光フアイバの線引方法におい
て、上記プリフオームの表面にイオン風を吹き付
けることを特徴とするものである。
In order to achieve the above object, the present invention provides an optical fiber drawing method in which an optical fiber preform is supplied to a heating furnace, melted and softened, and then drawn, which is characterized by blowing ion wind onto the surface of the preform. That is.
以下、本発明を、図面にもとづいて説明する
と、図面は本発明方法の実施に供して好適な光フ
アイバ線引装置の一実施例を示す概略構成図で、
１はガラス母材であるプリフオーム、２および３
は加熱炉内を不活性雰囲気に保つためのガス導入
管、４は加熱炉炉心管、５はヒータ、６は炉心管
４の下部に取り付けた、フアイバ通過孔を有する
底板、７は線引きされた光フアイバを示してい
る。しかして、ガス導入管２および３のガス吹出
口付近には、電極端子８および９が設けられてお
り、電極端子８，９には、リード線１０および１
１の一端が接続されており、リード線１０，１１
の他端は、高電圧発生装置１２に接続されてい
る。
Hereinafter, the present invention will be explained based on the drawings. The drawings are schematic configuration diagrams showing one embodiment of an optical fiber drawing apparatus suitable for carrying out the method of the present invention.
1 is a preform which is a glass base material, 2 and 3
4 is a heating furnace core tube; 5 is a heater; 6 is a bottom plate with a fiber passage hole attached to the bottom of the furnace core tube 4; 7 is a wire-drawn Optical fiber is shown. Electrode terminals 8 and 9 are provided near the gas outlet of the gas introduction pipes 2 and 3, and lead wires 10 and 1 are connected to the electrode terminals 8 and 9, respectively.
One end of 1 is connected, and the lead wires 10, 11
The other end is connected to the high voltage generator 12.
以上の構成において、プリフオーム１から線引
きされた光フアイバ７を得るためには、プリフオ
ーム１を一定速度でVpで加熱炉々心管４に供給
し、これをヒータ５で溶融軟化した後、引取速度
Vfで引き取る。また、このとき、リード線１０，
１１を介して、高電圧発生装置１２から電極端子
８，９に高電圧を供給し、ガス導入管２，３のガ
ス吹出口部分で放電がおこると、該部を通過する
加熱炉シールガス（たとえば、N2ガスやArガス
などの不活性ガス）にマイナスの電荷が付与され
る。このようにして、マイナスの電荷を帯びて陰
イオンとなつたガス流は、プリフオーム１の表面
にイオン風として吹き付けられるものであつて、
上記マイナスの電荷をもつイオン風は、プリフオ
ーム１の表面に帯電しているプラスの電荷を中和
するとともに、それまでプリフオーム１の表面に
静電気的に強固に付着していた不純物を吹き飛ば
し、当該プリフオーム１の表面を清浄にする。し
かも、上記のごとく処理されたプリフオーム１の
表面は、静電気的に中性であるため、炉心管４内
で微少不純物が新たに発生したとしても、それら
の微少不純物がプリフオーム１の表面に付着する
ようなことはない。 In the above configuration, in order to obtain the optical fiber 7 drawn from the preform 1, the preform 1 is supplied to the heating furnace core tube 4 at a constant speed of Vp, and after being melted and softened by the heater 5,
Pick up with V f . Also, at this time, the lead wire 10,
11, a high voltage is supplied from the high voltage generator 12 to the electrode terminals 8, 9, and when a discharge occurs at the gas outlet portions of the gas introduction pipes 2, 3, the heating furnace sealing gas ( For example, an inert gas such as N2 gas or Ar gas) is given a negative charge. In this way, the gas flow, which is negatively charged and becomes anions, is blown onto the surface of the preform 1 as an ion wind.
The above-mentioned negatively charged ion wind neutralizes the positive charges on the surface of the preform 1, and also blows off impurities that have been strongly adhered to the surface of the preform 1 due to static electricity, thereby making the preform Clean the surface of 1. Moreover, since the surface of the preform 1 treated as described above is electrostatically neutral, even if minute impurities are newly generated within the reactor core tube 4, those minute impurities will not adhere to the surface of the preform 1. There is no such thing.
なお、上記の電極８，９、リード線１０，１１
および高電圧発生装置１２を有するイオン風発生
手段は、静電気除去装置BL（Ｗ）−07型として春
日電機株式会社から入手可能である。この静電気
除去装置BL（Ｗ）−07型は、電極８，９に相当す
る針状電極端子と平板電極端子との間に9kV程度
の高電圧を加えることによりコロナ放電を発生さ
せてガスをイオン化し、このイオン化したガス流
を帯電体に吹きつけて除電するものである。な
お、マイナスの電荷を帯びたイオン風は、針状電
極端子にマイナスの電極を接続して放電すること
により発生させることができる。 In addition, the above electrodes 8, 9, lead wires 10, 11
The ion wind generating means having the high voltage generator 12 is available from Kasuga Denki Co., Ltd. as a static electricity eliminator BL(W)-07 type. This static electricity eliminator BL(W)-07 type generates corona discharge and ionizes gas by applying a high voltage of about 9kV between needle electrode terminals and flat electrode terminals corresponding to electrodes 8 and 9. This ionized gas flow is then blown onto the charged body to remove the charge. Note that the negatively charged ion wind can be generated by connecting a negative electrode to the needle-shaped electrode terminal and discharging it.
本発明は以上のごときであり、本発明によれば
たとえプリフオーム１の表面に不純物が付着して
いる場合であつても、これら不純物を確実に除去
することができるものであり、従来解決が困難と
されていた問題点、すなわち、プリフオーム１の
表面に付着している不純物が当該プリフオーム１
とともに加熱炉に供給され、高温に加熱されてプ
リフオーム１と反応することにより、光フアイバ
７の表面に欠陥を生じるという問題点を解決し、
ひいては低荷重域で断線することの少ない光フア
イバ７を得ることができる。
The present invention is as described above, and according to the present invention, even if impurities are attached to the surface of the preform 1, these impurities can be reliably removed, which is difficult to solve in the past. The problem was that impurities adhering to the surface of the preform 1
This solves the problem of causing defects on the surface of the optical fiber 7 by being supplied to the heating furnace and heated to a high temperature and reacting with the preform 1.
As a result, it is possible to obtain an optical fiber 7 that is less likely to break in a low load region.
図面は本発明方法の実施に供して好適な光フア
イバ線引装置の一実施例を示す概略構成図であ
る。
１……プリフオーム、２および３……ガス導入
管、４……加熱炉々心管、５……ヒータ、６……
底板、７……光フアイバ、８および９……電極端
子、１０および１１……リード線、１２……高電
圧発生装置。
The drawing is a schematic diagram showing an embodiment of an optical fiber drawing apparatus suitable for carrying out the method of the present invention. 1... Preform, 2 and 3... Gas introduction tube, 4... Heating furnace core tube, 5... Heater, 6...
Bottom plate, 7... Optical fiber, 8 and 9... Electrode terminal, 10 and 11... Lead wire, 12... High voltage generator.
Claims (1)
し、これを溶融軟化して線引きする光フアイバの
線引方法において、上記プリフオームの表面にイ
オン風を吹き付けることを特徴とする光フアイバ
の線引方法。1. An optical fiber drawing method in which an optical fiber preform is supplied to a heating furnace, melted and softened, and then drawn, the method comprising blowing ionized air onto the surface of the preform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7230484A JPS60215543A (en) | 1984-04-11 | 1984-04-11 | Method of drawing optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7230484A JPS60215543A (en) | 1984-04-11 | 1984-04-11 | Method of drawing optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60215543A JPS60215543A (en) | 1985-10-28 |
| JPH0314790B2 true JPH0314790B2 (en) | 1991-02-27 |
Family
ID=13485388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7230484A Granted JPS60215543A (en) | 1984-04-11 | 1984-04-11 | Method of drawing optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60215543A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000327359A (en) * | 1999-05-24 | 2000-11-28 | Furukawa Electric Co Ltd:The | Optical fiber manufacturing method and optical fiber preform storage device |
-
1984
- 1984-04-11 JP JP7230484A patent/JPS60215543A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60215543A (en) | 1985-10-28 |
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