JPS6374938A - Control of outer diameter of coated optical fiber - Google Patents
Control of outer diameter of coated optical fiberInfo
- Publication number
- JPS6374938A JPS6374938A JP61216012A JP21601286A JPS6374938A JP S6374938 A JPS6374938 A JP S6374938A JP 61216012 A JP61216012 A JP 61216012A JP 21601286 A JP21601286 A JP 21601286A JP S6374938 A JPS6374938 A JP S6374938A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- outer diameter
- coated
- resin
- coated optical
- 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 75
- 238000000576 coating method Methods 0.000 claims abstract description 36
- 239000011347 resin Substances 0.000 claims abstract description 36
- 229920005989 resin Polymers 0.000 claims abstract description 36
- 239000011248 coating agent Substances 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims description 12
- 238000007664 blowing Methods 0.000 claims description 3
- 239000000835 fiber Substances 0.000 abstract description 6
- 230000001105 regulatory effect Effects 0.000 abstract 4
- 238000005491 wire drawing Methods 0.000 description 7
- 229920006240 drawn fiber Polymers 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000004033 diameter control Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
この発明は、被覆光ファイバの仕−ヒリ外径を整えるた
めの外径制御方法に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an outer diameter control method for adjusting the cut outer diameter of a coated optical fiber.
〈従来の技術〉
光ファイバの機械的強度を高めたり、表面に傷がついた
りすることを防止するため、従来から線引きしたファイ
バ９の表面を樹脂で被覆していた。<Prior Art> Conventionally, the surface of the drawn fiber 9 has been coated with resin in order to increase the mechanical strength of the optical fiber and to prevent the surface from being scratched.
従来の光ファイバの被覆は第４図に示す構成の線引き装
置１）を用いて行っていた。線引き装置Ｉｔは光フアイ
バ用母材１（以下、「プリフォーム」という）を加熱軟
化して線引きしたファイバ９の表面に樹脂を被覆した後
、硬化炉を通して硬化させていた。この線引き装置１）
は、線引き炉２．被覆ダイス３．６および硬化炉４．マ
から構成されており、樹脂被覆は伝送特性上、一般に、
二層以上の複数層コーティング方式で行われていた。Conventionally, optical fibers have been coated using a drawing device 1) having the configuration shown in FIG. The drawing device It heats and softens an optical fiber base material 1 (hereinafter referred to as "preform"), coats the surface of the drawn fiber 9 with resin, and then passes the resin through a curing furnace to harden it. This line drawing device 1)
The drawing furnace 2. Coating die 3.6 and curing furnace 4. Due to its transmission characteristics, the resin coating generally
It was done using a multi-layer coating method with two or more layers.
〈発明が解決しようとする問題点〉
ところが、光ファイバの表面に樹脂を複数層コーティン
グする場合に仕上り外径を整えるには、従来は被覆ダイ
スの穴径を変える以外に適当な調節方法かなかった。こ
のように被覆ダイスの穴径を変化させる方法によると、
線引き中に光ファイバの被覆外径に微小の変化を与える
制御は全く不可能であった。<Problems to be Solved by the Invention> However, in order to adjust the finished outer diameter when coating multiple layers of resin on the surface of an optical fiber, conventionally there was no suitable adjustment method other than changing the hole diameter of the coating die. Ta. According to this method of changing the hole diameter of the coating die,
It has been impossible to control minute changes in the outer diameter of the optical fiber coating during drawing.
また、被覆ダイスの穴径を精度よく作ることか困難であ
ったから、例えば同じ公称径の被覆ダイスを使ったとし
ても、被覆光ファイバの仕上り外径がそれぞれ違う場合
か多かった。In addition, it was difficult to accurately form the hole diameter of the coating die, so even if coating dies with the same nominal diameter were used, the finished outer diameters of the coated optical fibers were often different.
この発明はこのような従来の被覆光ファイバの外径制御
方法の欠点を除去するためになされたものであって、被
覆光ファイバの外径を設定値の通りに被覆制御できる被
覆光ファイバの外径制御方法を提供しよう−とするもの
である。The present invention was made in order to eliminate the drawbacks of the conventional method for controlling the outer diameter of a coated optical fiber, and is to provide an outer diameter control method for a coated optical fiber that can control the outer diameter of the coated optical fiber according to a set value. This paper attempts to provide a diameter control method.
〈問題点を解決するための手段〉
上述の目的を達成するため、この発明は光ファイバの表
面に樹脂を′ａ数層被覆するに当り、被覆した光ファイ
バの外径と設定値の被覆光ファイバの外径の差の大小に
応じ、被覆しようとする光ファイバの表面温度を調節す
ることにより被覆光ファイバ表面に対する樹脂付着量を
調節し、被覆光ファイバの仕上り外径を制御することを
特徴とするものである。<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention covers the outer diameter of the coated optical fiber and the coating light of a set value when coating the surface of the optical fiber with several layers of resin. It is characterized by controlling the finished outer diameter of the coated optical fiber by adjusting the surface temperature of the optical fiber to be coated according to the size of the difference in the outer diameter of the fiber, thereby adjusting the amount of resin deposited on the surface of the coated optical fiber. That is.
〈作 用〉
このように、光ファイバの表面に複数層の樹脂を被覆す
るに当り、二層め以降の樹脂層を被覆する前に、被覆し
た光ファイバの外径と設定値の被覆ファイバの外径との
差に応じて被覆しようとする光ファイバの表面温度を調
節し、光ファイバの表面に被覆する樹脂材、ｎ量を調節
するから、被覆光ファイバの仕上り外径を均一に制御す
ることができる。<Function> In this way, when coating the surface of an optical fiber with multiple layers of resin, before coating the second and subsequent resin layers, the outer diameter of the coated optical fiber and the set value of the coated fiber are determined. The surface temperature of the optical fiber to be coated is adjusted according to the difference with the outer diameter, and the amount of resin material and n coated on the surface of the optical fiber is adjusted, so the finished outer diameter of the coated optical fiber can be controlled uniformly. be able to.
く実 施 例〉
次に、実施例および比較例に基づいてこの発明をより具
体的に説明する。EXAMPLES Next, the present invention will be described in more detail based on Examples and Comparative Examples.
（実施例 １）
第１図に、この発明の被覆光ファイバの外径制御方法の
実施に使用する線引き装置１）ａの概略構成を示す縦断
面図であって、１は光フアイバ用母材（以下、「プリフ
ォーム」という）、２は線引き炉、３は一層め被覆ダイ
ス、４は一層め硬化炉、５は温度調節器、６は二層め被
覆ダイス、７は二層め被覆樹脂硬化炉、８は外径モニタ
、９は線引きファイバ、ｌＯは被覆光ファイバである。(Example 1) FIG. 1 is a longitudinal cross-sectional view showing the schematic configuration of a drawing device 1)a used to carry out the method for controlling the outer diameter of a coated optical fiber of the present invention, in which 1 is a base material for an optical fiber. (hereinafter referred to as "preform"), 2 is a wire drawing furnace, 3 is a first layer coating die, 4 is a first layer curing furnace, 5 is a temperature controller, 6 is a second layer coating die, 7 is a second layer coating resin A curing furnace, 8 an outer diameter monitor, 9 a drawn fiber, and IO a coated optical fiber.
この線引き装置１）ａの外径モニタ８は、温度調節器５
と連動しており、光ファイバの外径が設定値より大であ
るときは温度調節器５の作動により光ファイバの加熱温
度を上げる。また、外径モニタ８によって検出される光
ファイバの外径が設定値よりも小さいときは温度調節器
５によって光ファイバの加熱温度を下げ、二層めの樹脂
被覆ダイスおよび硬化炉７における樹脂の定着量を上げ
ることにより外径を増大させる。The outer diameter monitor 8 of this wire drawing device 1)a is connected to the temperature controller 5.
When the outer diameter of the optical fiber is larger than the set value, the temperature controller 5 is operated to raise the heating temperature of the optical fiber. Further, when the outer diameter of the optical fiber detected by the outer diameter monitor 8 is smaller than the set value, the heating temperature of the optical fiber is lowered by the temperature controller 5, and the resin in the second layer resin coating die and the curing furnace 7 is heated. The outer diameter is increased by increasing the amount of fixation.
上・述の線引き装置１）ａにおいて一層め被覆樹脂硬化
炉４と二層め被覆ダイス６との間に温度調節器５を設は
光ファイバの表面加熱温度を調節するようにしたのは、
光ファイバの表面温度が変化すると、樹脂被覆ダイス中
を通る光フアイバ表面に付着する樹脂実着量を変えるこ
とができるためである。すなわち、本発明者は光ファイ
バの表面温度と被覆径との間には第２図に示すような関
係があることを知った。つまり、光ファイバの表面温度
が高くなる程、樹脂の実着量か減少する。これは第３図
（ａ） （ｂ）に示すように温度が高くなる程（曲、Ｉ
！ｉ！ａ ）樹脂の粘度が低下するが、光ファイバの表
面温度か低い場合（曲線ｂ）は被覆ダイス内の樹脂の温
度分布、粘度分布はなだらかであるが、光ファイバの表
面温度が被覆ダイス内樹脂温度よりも高温で、その温度
差か大きくなると、光ファイバの表面附近の樹脂温度が
上昇し、光ファイバの表面近傍の樹脂の粘度が低下する
。そして被覆ダイス内の樹脂の粘度分布が大きくなり、
光ファイバの表面附近の樹脂の速度勾配（せん断速度）
が大きくなる故に、樹脂のけん引力は低下し、光フアイ
バ表面に付着して、被覆ダイスから出てゆく樹脂の量が
減少することになる。The temperature controller 5 is installed between the first layer coating resin curing furnace 4 and the second layer coating die 6 in the above-mentioned wire drawing apparatus 1)a to adjust the surface heating temperature of the optical fiber.
This is because when the surface temperature of the optical fiber changes, the amount of resin that adheres to the surface of the optical fiber passing through the resin-coated die can be changed. That is, the present inventor found that there is a relationship as shown in FIG. 2 between the surface temperature of an optical fiber and the coating diameter. In other words, as the surface temperature of the optical fiber becomes higher, the actual amount of resin deposited decreases. As shown in Figure 3 (a) and (b), the higher the temperature (song, I
! i! a) When the viscosity of the resin decreases but the surface temperature of the optical fiber is low (curve b), the temperature distribution and viscosity distribution of the resin inside the coating die are gentle, but the surface temperature of the optical fiber is lower than the surface temperature of the resin inside the coating die. When the temperature is higher than that and the temperature difference becomes large, the temperature of the resin near the surface of the optical fiber increases, and the viscosity of the resin near the surface of the optical fiber decreases. Then, the viscosity distribution of the resin inside the coating die becomes larger,
Velocity gradient (shear velocity) of resin near the surface of optical fiber
Because of the increased traction force on the resin, less resin adheres to the fiber surface and exits the coating die.
本実施例において、一層め被覆ダイス３に穴径０．３ｍ
ｍφのものを、二層め被覆ダイス６に穴径０．７ｍｍφ
のダイスを使用し、温度調節器５にドライヤー型のＮ２
ガス吹きつけ装置に加熱ヒータ、冷却装置を取りつけた
ものを使用し、−１０℃〜１００℃の温度範囲内の任意
の温度のＮ２ガスを光ファイバに吹きつけることにより
、光ファイバの表面温度を自由に調節できるようにした
。In this example, the first layer coating die 3 has a hole diameter of 0.3 m.
mφ hole diameter 0.7mmφ into the second layer coating die 6.
using a dryer-type N2 die in the temperature controller 5.
Using a gas blowing device equipped with a heater and a cooling device, the surface temperature of the optical fiber can be adjusted by blowing N2 gas at any temperature within the temperature range of -10°C to 100°C onto the optical fiber. It can be adjusted freely.
そして、ファイバ径１２５μ謂の光ファイバの仕上り外
径を０．４ｍｍφに設定して線引きし、外径変動を記録
したところ、線速５０〜１００ｍ／ｍｉｎの間で、被覆
光ファイバの仕上り外径を０．４００±０．００１ ｍ
ｍφにすることができた。Then, an optical fiber with a fiber diameter of 125 μm was drawn with the finished outer diameter set to 0.4 mmφ, and fluctuations in the outer diameter were recorded. 0.400±0.001 m
I was able to make it mφ.
（比較例 １）
実施例１と同じ線引き装置１）ａおよび線引き条件で温
度調節器５の作動を完全に停止させて線引きした所、線
速５０〜１００ｎ＋／ｍｉｎの範囲でその仕上り外径は
、 ０．４１８±０．００３ ＋ｎ＋＋＋φの間であっ
た。(Comparative Example 1) When wire was drawn with the temperature controller 5 completely stopped under the same wire drawing apparatus 1) a as in Example 1 and the wire drawing conditions, the finished outer diameter was , 0.418±0.003 +n+++φ.
（実施例 ２）
一層め被覆ダイス３に穴径０．３ｍｍφのダイスを使用
した他は全て実施例１と同じ装置および条件で線引きを
行った。(Example 2) Wire drawing was carried out using the same apparatus and conditions as in Example 1, except that a die with a hole diameter of 0.3 mm was used as the first layer coating die 3.
その結果、その被覆光ファイバの仕上り外径は０．４０
０±０．００２ ｍｍφの範囲であった。As a result, the finished outer diameter of the coated optical fiber was 0.40
The range was 0±0.002 mmφ.
（比較例 ２）
実施例２と同じ装置、同じ条件で温度調節器５の作動を
完全に停止させて線引きした所、その仕上り外径は、０
．３８５±０．００３ ｍｍφの範囲であった。(Comparative Example 2) When wire was drawn using the same equipment and under the same conditions as in Example 2 with the operation of the temperature controller 5 completely stopped, the finished outer diameter was 0.
．． The range was 385±0.003 mmφ.
〈発明の効果〉
以上の説明から明らかなように、この発明の被覆光ファ
イバの外径制御方法によれば、穴径の仕上り径が微妙に
異なる被覆ダイスを使用しても、線引きファイバの線速
に関係なく、設定値通りの仕上り外径を有する被覆光フ
ァイバを作製することかできる。<Effects of the Invention> As is clear from the above explanation, according to the method for controlling the outer diameter of a coated optical fiber of the present invention, even if a coated die with a slightly different finished hole diameter is used, the wire of the drawn fiber can be controlled. Regardless of the speed, it is possible to produce a coated optical fiber having a finished outer diameter that matches the set value.
第１図は実施例の被覆光ファイバの外径制御方法の実施
に使用する線引き装置の概略構成を示す要部縦断面図、
第２図は光ファイバの加熱温度対光フアイバ表面に付着
する樹脂被覆径の関係を示す特性図、第３図（ａ） （
ｂ）はそれぞれ被覆ダイス内における光フアイバ表面か
らの距離対温度および樹脂の粘度変化の関係を示す特性
図、第４図は従来の被覆光ファイバの樹脂被覆に使用す
る線引き装置の概略構成を示す縦断面図である。
図面中、
１・・・プリフォーム、
２・・・線引き炉、
３．６・・・被覆ダイス、
４．７・・・硬化炉、
５・・・温度調節装置、
８・・・外径モニタ、
ｌｌ・・・従来の被覆光ファイバの外径制御に使用して
いた線引き装置、
１）ａ・・・本発明の被覆光ファイバの外径制御に使用
する線引き装置。FIG. 1 is a vertical cross-sectional view of a main part showing a schematic configuration of a drawing device used to implement the method for controlling the outer diameter of a coated optical fiber according to an embodiment;
Figure 2 is a characteristic diagram showing the relationship between the heating temperature of the optical fiber and the diameter of the resin coating attached to the surface of the optical fiber, and Figure 3 (a) (
b) is a characteristic diagram showing the relationship between the distance from the surface of the optical fiber in the coating die and the temperature and viscosity change of the resin, respectively, and Fig. 4 shows the schematic configuration of a drawing device used for coating the conventional coated optical fiber with resin. FIG. In the drawings, 1... Preform, 2... Wire drawing furnace, 3.6... Coating die, 4.7... Curing furnace, 5... Temperature control device, 8... Outer diameter monitor , 11... A drawing device used to control the outer diameter of a conventional coated optical fiber, 1) a... A drawing device used to control the outer diameter of a coated optical fiber of the present invention.
Claims (3)
、被覆した光ファイバの外径と設定値の被覆光ファイバ
の外径の差の大小に応じ、被覆しようとする光ファイバ
の表面温度を調節することにより被覆光ファイバ表面に
対する樹脂付着量を調節し、被覆光ファイバの仕上り外
径を制御することを特徴とする被覆光ファイバの外径制
御方法。(1) When coating the surface of an optical fiber with multiple layers of resin, the surface temperature of the optical fiber to be coated depends on the difference between the outer diameter of the coated optical fiber and the set value of the outer diameter of the coated optical fiber. 1. A method for controlling the outer diameter of a coated optical fiber, the method comprising controlling the finished outer diameter of the coated optical fiber by adjusting the amount of resin deposited on the surface of the coated optical fiber.
、被覆済光ファイバの外径をモニタリングし、その検出
した外径値と設定値の被覆光ファイバの値の差に応じ、
被覆しようとする光ファイバの表面温度を調節し、二層
目以降の樹脂付着量を調節することにより被覆光ファイ
バの仕上り外径を制御することを特徴とする特許請求の
範囲第（１）項記載の被覆光ファイバの外径制御方法。(2) When coating the surface of an optical fiber with multiple layers of resin, the outer diameter of the coated optical fiber is monitored, and according to the difference between the detected outer diameter value and the set value of the coated optical fiber,
Claim (1) characterized in that the finished outer diameter of the coated optical fiber is controlled by adjusting the surface temperature of the optical fiber to be coated and adjusting the amount of resin deposited in the second and subsequent layers. The method for controlling the outer diameter of the coated optical fiber described above.
ガス吹きつけ装置により行うことを特徴とする特許請求
の範囲第（１）項又は第（２）項記載の被覆光ファイバ
の外径制御方法。(3) The outer diameter of the coated optical fiber according to claim 1 or 2, wherein the surface temperature of the coated optical fiber is adjusted by a temperature-variable gas blowing device. Control method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61216012A JPS6374938A (en) | 1986-09-16 | 1986-09-16 | Control of outer diameter of coated optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61216012A JPS6374938A (en) | 1986-09-16 | 1986-09-16 | Control of outer diameter of coated optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6374938A true JPS6374938A (en) | 1988-04-05 |
Family
ID=16681916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61216012A Pending JPS6374938A (en) | 1986-09-16 | 1986-09-16 | Control of outer diameter of coated optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6374938A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02275734A (en) * | 1989-04-14 | 1990-11-09 | Fujikura Ltd | Production of optical fiber |
| EP0619275A2 (en) * | 1993-04-05 | 1994-10-12 | Corning Incorporated | Method and apparatus for coating optical waveguide fibers |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS597655A (en) * | 1982-07-05 | 1984-01-14 | Nisshin Steel Co Ltd | Low contact pressure support roll device |
-
1986
- 1986-09-16 JP JP61216012A patent/JPS6374938A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS597655A (en) * | 1982-07-05 | 1984-01-14 | Nisshin Steel Co Ltd | Low contact pressure support roll device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02275734A (en) * | 1989-04-14 | 1990-11-09 | Fujikura Ltd | Production of optical fiber |
| EP0619275A2 (en) * | 1993-04-05 | 1994-10-12 | Corning Incorporated | Method and apparatus for coating optical waveguide fibers |
| US5366527A (en) * | 1993-04-05 | 1994-11-22 | Corning Incorporated | Method and apparatus for coating optical waveguide fibers |
| EP0619275A3 (en) * | 1993-04-05 | 1995-07-26 | Corning Inc | Method and apparatus for coating optical waveguide fibers. |
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