JPS6158407B2 - - Google Patents
Info
- Publication number
- JPS6158407B2 JPS6158407B2 JP9912482A JP9912482A JPS6158407B2 JP S6158407 B2 JPS6158407 B2 JP S6158407B2 JP 9912482 A JP9912482 A JP 9912482A JP 9912482 A JP9912482 A JP 9912482A JP S6158407 B2 JPS6158407 B2 JP S6158407B2
- Authority
- JP
- Japan
- Prior art keywords
- fiber
- base material
- strength
- present
- hydrofluoric acid
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/66—Chemical treatment, e.g. leaching, acid or alkali treatment
- C03C25/68—Chemical treatment, e.g. leaching, acid or alkali treatment by etching
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C15/00—Surface treatment of glass, not in the form of fibres or filaments, by etching
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Glass Melting And Manufacturing (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Description
【発明の詳細な説明】
本発明は光伝送に用いられるガラスフアイバの
母材表面処理方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating the surface of a glass fiber base material used for optical transmission.
現在、光通信用として実用化の検討が行なわれ
ている光フアイバとしては、一般にコア、グラツ
ドとも石英ガラスあるいは多成分ガラスからなる
ガラスフアイバが伝送特性、機械特性においてす
ぐれているが、本発明はこの光伝送用ガラスフア
イバの機械的強度の改善に関するものである。 Currently, glass fibers whose core and glass are made of quartz glass or multi-component glass have excellent transmission and mechanical properties as optical fibers that are currently being considered for practical use in optical communications. The present invention relates to improving the mechanical strength of this optical transmission glass fiber.
光フアイバの強度に影響を与える要因は製造の
各工程に分散し、高強度フアイバを得るためには
(1)フアイバの最外層を形成する石英管の品質、例
えば気泡、表面傷の有無、合成品と天然品の差な
ど、(2)線引き前のフアイバ母材の表面状態、(3)線
引き炉の雰囲気および線引温度、(4)フアイバコー
テイングの材料およびその方法、など全ての要因
を最適化する必要がある。中でも線引き前のフア
イバ母材（以下、フアイバ母材と称する）の表面
状態は、フアイバ強度に最も大きな影響を与える
要因のひとつである。 The factors that affect the strength of optical fiber are dispersed in each manufacturing process, and in order to obtain a high-strength fiber,
(1) The quality of the quartz tube that forms the outermost layer of the fiber, such as the presence or absence of air bubbles, surface scratches, differences between synthetic and natural products, etc. (2) Surface condition of the fiber base material before drawing, (3) Drawing furnace All factors such as the atmosphere and drawing temperature, (4) the fiber coating material and method, etc., need to be optimized. Among these, the surface condition of the fiber base material before drawing (hereinafter referred to as fiber base material) is one of the factors that has the greatest effect on fiber strength.
フアイバ母材の表面処理方法は、これまでに数
多く提案されている。 Many surface treatment methods for fiber base materials have been proposed so far.
例えば特開昭53−70450号公報には、紡糸前の
プレフオームロツドをフツ酸系の溶液に浸漬した
後、紡糸することにより高強度なフアイバが得ら
れることが記載されている。しかしながら、本発
明者等の検討によれば、こうして得られた光フア
イバは、フアイバ母材の表面処理を何ら行なわな
いものと比較するとかなり高いレベルの強度を有
してはいるが、５Kmの実用長尺フアイバを考えた
場合、依然、低強度部分を含んでいる。この理由
について本発明者等が検討を重ねたところ、フツ
酸等の表面処理によりフアイバ母材の表面に存在
する傷あるいは不均質な部分が浸食されて若干、
滑らかになるが、完全に均一な表面とはならず、
いわゆるエツチピツトが残ることが原因と推定さ
れた。高強度フアイバを得るためにはこのエツチ
ピツトを取り除くことが必須である。 For example, JP-A-53-70450 describes that a high-strength fiber can be obtained by immersing a preform rod before spinning in a hydrofluoric acid solution and then spinning it. However, according to the studies conducted by the present inventors, the optical fiber thus obtained has a considerably higher level of strength compared to one without any surface treatment of the fiber base material, but When considering long fibers, they still contain low strength portions. The inventors of the present invention have repeatedly investigated the reason for this, and have found that scratches or uneven areas on the surface of the fiber base material are eroded due to surface treatment with hydrofluoric acid, etc.
The surface will be smooth, but not completely uniform.
It was assumed that the cause was that so-called etch pits remained. Removal of this etching pit is essential to obtain a high strength fiber.
一方、母材表面処理の別の方法として、酸水素
炎等による火炎研磨も知られているが、火炎研磨
だけでは表面層に存在する不純物が逆に母材表面
内に溶融してしまい強度低下をもたらすことがあ
る。火炎研磨が効果をもたらすのは母材表面が充
分に清浄である時のみである。 On the other hand, flame polishing using oxyhydrogen flame is known as another method for surface treatment of the base material, but flame polishing alone causes impurities present in the surface layer to melt into the surface of the base material, resulting in a decrease in strength. may result in Flame polishing is effective only when the base material surface is sufficiently clean.
本発明者等はこれら従来のフアイバ母材表面処
理において、今まで知られていなかつた欠点を除
いて高強度フアイバを得る方法を提供すべく重ね
た結果、フツ酸等の表面処理の後に酸水素炎によ
る火炎研磨を行なうことにより光フアイバ母材表
面上の傷あるいは不均質部分の除去が達成でき、
このような表面処理を施したフアイバ母材からは
長尺にわたつて高強度の光フアイバが得られるこ
とを見出して本発明に到達したものである。 The present inventors have repeatedly tried to provide a method for obtaining high-strength fibers by eliminating the previously unknown drawbacks of these conventional fiber base material surface treatments. As a result, after surface treatment with hydrofluoric acid, etc. By flame polishing with flame, it is possible to remove scratches or uneven parts on the surface of the optical fiber base material.
The present invention was achieved by discovering that a long optical fiber with high strength can be obtained from a fiber base material subjected to such surface treatment.
すなわち、本発明は線引き前のフアイバ母材を
５重量％から30重量％の濃度範囲のフツ酸系溶液
に0.5時間から５時間浸漬し、しかる後、酸水素
炎にてフアイバ母材の表面温度が1500℃から2300
℃になるような火炎研磨を少なくとも１回行な
い、その後、線引きすることを特徴とする光伝送
用ガラスフアイバの製造方法に関するものであ
る。 That is, in the present invention, the fiber base material before drawing is immersed in a hydrofluoric acid solution with a concentration range of 5% to 30% by weight for 0.5 to 5 hours, and then the surface temperature of the fiber base material is lowered using an oxyhydrogen flame. from 1500℃ to 2300℃
The present invention relates to a method for producing a glass fiber for optical transmission, which comprises performing flame polishing at least once at a temperature of 0.degree. C., followed by drawing.
本発明におけるフツ酸系溶液としては、フツ化
水素（HF）、フツ硫酸（HF・H2SO4）、フツ硝酸
（HF・HNO3）などが挙げられる。フツ酸処理と
酸水素火炎研磨、酸水素火炎研磨と線引、各々の
間の時間を短かくすると、本発明の効果を最大限
に発揮することができ、上記各工程の間の時間は
0.5時間程度が好ましい。 Examples of the hydrofluoric acid solution in the present invention include hydrogen fluoride (HF), hydrofluoric sulfuric acid (HF·H 2 SO 4 ), hydrofluoric acid (HF·HNO 3 ), and the like. The effects of the present invention can be maximized by shortening the time between hydrofluoric acid treatment and oxyhydrogen flame polishing, and between oxyhydrogen flame polishing and wire drawing.
About 0.5 hours is preferable.
第１図に、同一のフアイバ母材を３分割し、
各々イ、アルコールにより表面の汚れを除去、
ロ、15重量％のフツ酸溶液に2.5時間浸漬したも
の、ハ、アルコールで表面を洗浄した後、表面温
度2000℃で母材を酸水素火炎研磨したもの、ニ、
ロを更にフアイバ母材の表面温度2000℃になるよ
うに酸水素火炎研磨したもの、の処理を施した
後、カーボン抵抗炉で約2300℃で線引したフアイ
バの引張強度を示す。試料長は20m、歪速度は
0.05／分、ｎ＝5.00回である。 Figure 1 shows that the same fiber base material is divided into three parts.
A. Remove surface dirt with alcohol,
B. Materials immersed in a 15% by weight hydrofluoric acid solution for 2.5 hours. C. After cleaning the surface with alcohol, the base material was polished with oxyhydrogen flame at a surface temperature of 2000°C. D.
The figure shows the tensile strength of the fiber which was further treated with oxyhydrogen flame polishing to bring the surface temperature of the fiber base material to 2000°C and then drawn at approximately 2300°C in a carbon resistance furnace. The sample length is 20m, and the strain rate is
0.05/min, n=5.00 times.
第１図から判るようにフツ酸処理のみのフアイ
バロは処理なしイに比較してはるかに改善されて
いるが、20m×500＝10Kmでの最低強度は60Kg／
mm2とまだ小さい。それに対し、ニの本発明のフア
イバは10Kmでの最低強度が150Kg／mm2と非常に高
いレベルにある。又ハの火炎研磨処理のみのフア
イバに比しても本発明によるニのフアイバは強く
なつている。 As can be seen from Figure 1, the fiber treated only with hydrofluoric acid is much improved compared to the untreated fiber, but the minimum strength at 20 m x 500 = 10 km is 60 kg /
mm 2 is still small. On the other hand, the fiber of the present invention (2) has a minimum strength of 150 kg/mm 2 at 10 km, which is a very high level. Furthermore, the fiber (2) according to the present invention is stronger than the fiber (3) which has been subjected to only flame polishing treatment.
以上の様に本発明は、母材をフツ酸系溶液で表
面処理することにより不純物を除去し、かつ大部
分の表面傷を減少させ、その過程で生じた強度に
悪影響をもたらすエツチピツトを火炎研磨により
除去することにより単独の表面処理では実現出来
ないフアイバ強度を得ることを可能にしたもので
ある。 As described above, the present invention removes impurities by surface-treating the base material with a hydrofluoric acid solution, reduces most surface scratches, and flame-polishes the etch pits that adversely affect the strength caused in the process. By removing the fibers, it is possible to obtain fiber strength that cannot be achieved by a single surface treatment.
添付の図面は、本発明の光フアイバと比較例の
強度を比較したグラフである。
The accompanying drawing is a graph comparing the strength of the optical fiber of the present invention and a comparative example.
Claims (1)
重量％のフツ酸系溶液に0.5時間から５時間浸漬
し、しかる後、酸水素炎にて該フアイバ母材の表
面温度が1500℃から2300℃となるような火炎研磨
を少なくとも１回行ない、その後、線引きするこ
とを特徴とする高強度光フアイバの製造方法。1 Optical fiber base material before drawing from 5% to 30% by weight
% by weight in a hydrofluoric acid solution for 0.5 to 5 hours, and then flame-polished at least once using an oxyhydrogen flame so that the surface temperature of the fiber base material becomes 1500°C to 2300°C, and then , a method for producing a high-strength optical fiber, characterized by drawing the fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9912482A JPS58217442A (en) | 1982-06-11 | 1982-06-11 | Manufacture of high strength optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9912482A JPS58217442A (en) | 1982-06-11 | 1982-06-11 | Manufacture of high strength optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58217442A JPS58217442A (en) | 1983-12-17 |
| JPS6158407B2 true JPS6158407B2 (en) | 1986-12-11 |
Family
ID=14239011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9912482A Granted JPS58217442A (en) | 1982-06-11 | 1982-06-11 | Manufacture of high strength optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58217442A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0776098B2 (en) * | 1985-10-29 | 1995-08-16 | 旭硝子株式会社 | Method for producing high-purity quartz glass |
| NL8601830A (en) * | 1986-07-14 | 1988-02-01 | Philips Nv | METHOD FOR MANUFACTURING OPTICAL FIBERS WITH A CORE AND GLASS COATING USING THE BAR IN TUBE TECHNOLOGY |
| JP4014045B2 (en) * | 2003-04-16 | 2007-11-28 | 信越化学工業株式会社 | Manufacturing method of glass rod |
| JP5607325B2 (en) * | 2009-08-03 | 2014-10-15 | 古河電気工業株式会社 | Rare earth element-doped optical fiber preform manufacturing method |
| JP2010013352A (en) * | 2009-09-07 | 2010-01-21 | Shin-Etsu Chemical Co Ltd | Method of processing glass preform |
| CN112521019A (en) * | 2020-11-09 | 2021-03-19 | 武汉长盈通光电技术股份有限公司 | Preparation method of high-strength special optical fiber |
-
1982
- 1982-06-11 JP JP9912482A patent/JPS58217442A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58217442A (en) | 1983-12-17 |
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