JPS6345150A - Method of secondary coating for optical fiber and device therefor - Google Patents
Method of secondary coating for optical fiber and device thereforInfo
- Publication number
- JPS6345150A JPS6345150A JP61186457A JP18645786A JPS6345150A JP S6345150 A JPS6345150 A JP S6345150A JP 61186457 A JP61186457 A JP 61186457A JP 18645786 A JP18645786 A JP 18645786A JP S6345150 A JPS6345150 A JP S6345150A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- secondary coating
- coating material
- crosshead
- reduced pressure
- 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
- 238000000576 coating method Methods 0.000 title claims abstract description 89
- 239000011248 coating agent Substances 0.000 title claims abstract description 86
- 239000013307 optical fiber Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims description 7
- 239000000463 material Substances 0.000 claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 229920005992 thermoplastic resin Polymers 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 239000003365 glass fiber Substances 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000004804 winding Methods 0.000 description 5
- 230000009172 bursting Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 101100264174 Mus musculus Xiap gene Proteins 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000000744 eyelid Anatomy 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/05—Filamentary, e.g. strands
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Extrusion Moulding Of Plastics Or The Like (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〕
本発明は光ファイバの２次ｔ！覆方法および２次被覆装
置に関し、とくに１次嘗Ｎされた光ファイバ素＄に２次
神覆として熱可１性です雪を被覆するに際し、２次ネウ
１の表面が滑らかで、かつ外怪が均一な光伝送用ガラス
ファイバの２次被覆方法訃よび２次被１妄置に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention provides a secondary t! Regarding the coating method and the secondary coating device, in particular, it is necessary to use thermoplastic as a secondary coating on the optical fiber element that has been subjected to the primary coating. The present invention relates to a method for uniformly secondary coating a glass fiber for optical transmission and a secondary coating method.
第２図に典型的な光ファイバの被覆概略を示す。 FIG. 2 shows a schematic diagram of a typical optical fiber coating.
一般に光伝送用ガラスファイバ１６に１次被覆９および
２次被覆１０を組合せて施した構造のものが使用されて
いる。１次被覆９とは、光ファイバ母材から光ファイバ
を紡糸する際に、紡糸に引き続きオンラインで光ファイ
バに被覆する被覆で、シリコンゴムや紫外線硬化型樹脂
が使用されている。Generally, a structure in which a primary coating 9 and a secondary coating 10 are applied to a light transmission glass fiber 16 in combination is used. The primary coating 9 is a coating that is applied to the optical fiber online after spinning when the optical fiber is spun from the optical fiber base material, and is made of silicone rubber or ultraviolet curing resin.
一方、２次被覆とは、紡糸の工程とは別工程で、１次被
覆された光ファイバ（以下光ファイバ素線という。）に
さらに樹脂を被覆したものであシ、２次被覆材料として
は、ナイロン、テフロンなどの熱可塑性樹脂が使用され
ている。On the other hand, secondary coating is a process that is separate from the spinning process, and is a process in which the primary coated optical fiber (hereinafter referred to as optical fiber strand) is further coated with resin. Thermoplastic resins such as , nylon, and Teflon are used.
第３図は従来の光ファイバ２次被覆装置の構成概要を示
す図である。光ファイバ素線１に加熱・溶融した２次被
覆材を塗布するクロスヘッド４が設けられている。２次
被覆材を塗布した光ファイバ素線２は冷却槽５へ送給さ
れる。冷却槽５を通過した２次被覆光ファイバ３は巻取
ボビン６によシ巻取られる。FIG. 3 is a diagram showing an outline of the configuration of a conventional optical fiber secondary coating device. A crosshead 4 is provided for applying a heated and melted secondary coating material to the optical fiber 1. The optical fiber 2 coated with the secondary coating material is fed to the cooling tank 5. The secondary coated optical fiber 3 that has passed through the cooling bath 5 is wound up on a winding bobbin 6.
上記の構成による光ファイバの２次被覆装置は、次のよ
うに動作する。繰出ボビン７から繰出された光ファイバ
素線１の外周に、クロスヘッド４によシ加熱・溶融した
２次被覆材を塗布した２次被覆塗布光ファイバ素＠２を
冷却槽５を通して２次被覆材を冷却・硬化し、２次被覆
光ファイバ３を、形成して巻取ボビン６に巻取る。The optical fiber secondary coating device having the above configuration operates as follows. A secondary coating coated optical fiber @ 2 is coated with a secondary coating material heated and melted by a crosshead 4 on the outer periphery of the optical fiber strand 1 fed out from a feeding bobbin 7, and then passed through a cooling tank 5 for secondary coating. The material is cooled and hardened to form a secondary coated optical fiber 3 and wound onto a winding bobbin 6.
一般に２次被覆材として使用される熱可塑性樹脂は、溶
融状態となるために２００〜′５００℃の温度が必要で
アシ、光ファイバ素線１は、クロスヘッド４およびクロ
スヘッド４と冷却槽５との間では、この２００〜３０咋
の温度の雰囲気内にあることになる。一方、１次被覆材
は、保管時に空気中の水分を吸収または吸湿していたυ
、また１次被覆材中に、主成分となっている高分子化合
物以外に、２００℃以下の温度でかつ室温以上の温度で
揮発する低分子量成分を含んでいる場合がちる。そのた
め、クロスヘッド４およびその直後において、クロスヘ
ッド４の熱または溶融された２次被覆材の熱によシ上記
の水分および低分子量成分が揮発し、第４図α、ｂに例
示するように２次被覆１０に気泡１１を生じたシ、気泡
の破裂１２を生じ、２次被覆光ファイバの表面に凹凸が
生じる。なお第４図α。Thermoplastic resin, which is generally used as a secondary coating material, requires a temperature of 200 to 500°C to reach a molten state. This means that the atmosphere is at a temperature of 200 to 30 degrees centigrade. On the other hand, the primary coating material absorbs or absorbs moisture in the air during storage.
In addition, the primary coating material often contains, in addition to the main component high molecular compound, a low molecular weight component that volatilizes at temperatures below 200° C. and above room temperature. Therefore, at the crosshead 4 and immediately after it, the above water and low molecular weight components are volatilized by the heat of the crosshead 4 or the heat of the melted secondary coating material, and as illustrated in Fig. 4 α and b, Bubbles 11 are generated in the secondary coating 10, and the bubbles burst 12, resulting in unevenness on the surface of the secondary coating optical fiber. In addition, Fig. 4 α.
ｂにおいて１６は光伝送用ガラスファイバ、９は１次被
覆を示す。In b, 16 indicates a glass fiber for optical transmission, and 9 indicates a primary coating.
第４図ａおよびｂに例示したように、２次被覆光ファイ
バの表面に生じた凹凸は、光ファイバ使用時に、光ファ
イバの微小な曲げ発生の原因となシ、このため光ファイ
バの伝送損失が増大する。As illustrated in Figures 4a and 4b, the unevenness formed on the surface of the secondary coated optical fiber causes minute bending of the optical fiber when the optical fiber is used, resulting in transmission loss of the optical fiber. increases.
従って、このような２次被覆光ファイバの表面に凹凸の
生じないことが望ましく、そのため、１次被覆中の水分
および揮発性成分を除去しつつ２次被覆を行うことが必
要である。Therefore, it is desirable that no irregularities occur on the surface of such a secondary coated optical fiber, and therefore it is necessary to perform the secondary coating while removing moisture and volatile components in the primary coating.
従来の光ファイバの２次被覆方法においては、２次被覆
表面の凹凸が生じやすく、その結果、光ファイバの伝送
損失の増大を生じやすい問題がある。In conventional methods for secondary coating of optical fibers, there is a problem in that unevenness tends to occur on the surface of the secondary coating, and as a result, transmission loss of the optical fiber tends to increase.
本発明は従来の問題を解決し、光ファイバ素線の２次被
覆の直前に、１次被覆中の水分および揮発性成分を除去
して、２次被覆の表面の凹凸発生を抑止するため、光フ
ァイバ素線に２次被覆材を塗布する直前に、光ファイバ
素線を減圧雰囲気中で加熱することを特徴とする。The present invention solves the conventional problems and removes moisture and volatile components in the primary coating immediately before the secondary coating of the optical fiber to prevent the occurrence of unevenness on the surface of the secondary coating. The method is characterized in that the optical fiber is heated in a reduced pressure atmosphere immediately before applying the secondary coating material to the optical fiber.
本発明は、光ファイバ素線に加熱・溶融した２次被覆材
を塗布する直前に、光ファイバ素線を減圧雰囲気中で加
熱することにより、１次被覆中に含まれている水分およ
び揮発性成分を強制的に揮発させ、除去し、しかる後２
次被覆材を塗布する。The present invention heats the optical fiber in a reduced pressure atmosphere immediately before applying the heated and melted secondary coating material to the optical fiber, thereby eliminating moisture and volatile content contained in the primary coating. Forcibly volatilize and remove the ingredients, then 2
Next, apply the covering material.
一般に、２次被覆材を光ファイバ素線に塗布する際、２
次被覆に気泡または気泡の破裂を生じ、２次被覆光ファ
イバの表面に凹凸を生じさせる揮発性成分として、１次
被覆中の水分および加熱・溶融された２次被覆材の温度
、すなわち２００〜３００℃で揮発する低分子量成分が
考えられる。そこで本発明は、２底抜覆材塗布直前に、
光ファイバ素線を２００〜３００℃に加熱し、かつ加熱
を減圧雰囲気中で行うことによシ、効率よく、強制的に
揮発性成分を揮発させる。したがって、２次破覆材塗布
時には、１次被覆中の水分および低分子量成分などの揮
発性成分はすべて揮発しておシ、加熱・溶融した２次被
覆材の熱によって新たな揮発は生じず、すなわち、揮発
性成分による２次被覆の気泡の発生、気泡の破裂は生じ
ることがないことから、２次被憂の表面には凹凸がなく
、滑らかな２次被覆を安定に施すことができる。以下図
面にもとづき実施例について説明する。Generally, when applying a secondary coating material to an optical fiber, two
Moisture in the primary coating and the temperature of the heated and melted secondary coating material, i.e., 200 to A low molecular weight component that volatilizes at 300°C is considered. Therefore, in the present invention, immediately before applying the two-bottom covering material,
By heating the optical fiber to 200 to 300° C. and performing the heating in a reduced pressure atmosphere, the volatile components are efficiently and forcibly volatilized. Therefore, when applying the secondary covering material, all volatile components such as moisture and low molecular weight components in the primary coating are volatilized, and no new volatilization occurs due to the heat of the heated and melted secondary covering material. That is, since the volatile components do not cause bubbles to form or burst in the secondary coating, the surface of the secondary coating does not have any unevenness, and a smooth secondary coating can be stably applied. . Examples will be described below based on the drawings.
第１図αに本発明による光７アイバク次杖覆装置の構成
概要を、また第１図すに本発明に係る減圧加熱機の一実
施例の構成概要を示す。FIG. 1 α shows an outline of the construction of a light 7 eyelid cover device according to the present invention, and FIG. 1 shows an outline of the construction of an embodiment of a vacuum heating machine according to the invention.
光ファイバ素線１の繰出ボビン７と、２次被覆材を塗布
するクロスヘッド４との間に減圧加熱機１３を設置する
。クロスヘッド４で２次被覆材を塗布した２次被覆塗布
光７アイパ素線２は、冷却槽５を通過して２次被覆材を
冷却・纒化し、２次被覆光ファイバ５を巻取ボビン６で
巻取る構成である。A vacuum heating machine 13 is installed between a bobbin 7 for feeding the optical fiber 1 and a crosshead 4 for applying a secondary coating material. The secondary coating light 7 Aipah wire 2 coated with the secondary coating material by the crosshead 4 passes through the cooling tank 5 to cool and coil the secondary coating material, and the secondary coating optical fiber 5 is sent to the winding bobbin. It is configured to wind up at 6.
繰出ボビン７から繰出した光ファイバ素線１を、減圧加
熱機１３において減圧雰囲気中で加熱し、１次被覆中の
水分および低分子量成分などの揮発性成分を強制的に揮
発させ、揮発性成分を除法する。The optical fiber 1 fed out from the feeding bobbin 7 is heated in a reduced pressure atmosphere in the reduced pressure heating machine 13 to forcibly volatilize volatile components such as moisture and low molecular weight components in the primary coating. Divide.
揮発性成分を除去した光ファイバ素線にクロスヘッド４
にて、直ちに加熱・溶融した２次被覆材を塗布し、２次
被覆塗布光ファイバ素線２を冷却槽５によシ冷却して２
次被覆材を便化させた２次被覆ファイバ３を巻取ボビン
６で巻取る。Crosshead 4 is attached to the optical fiber from which volatile components have been removed.
Immediately apply the heated and melted secondary coating material, and cool the optical fiber 2 coated with the secondary coating in the cooling tank 5.
The secondary coated fiber 3 with the coating material removed is wound up with a winding bobbin 6.
第１図すに示した減圧加熱機１３の実施例では、光７ア
イパ素線１に接触することなく加熱を行うため、加熱源
として赤外綿ランプ１４を用いている。In the embodiment of the reduced pressure heating machine 13 shown in FIG. 1, an infrared cotton lamp 14 is used as a heating source in order to heat the optical 7 AIPA wire 1 without contacting it.
なお加熱源としては、他に抵抗発熱体などを適用しても
よく、本発明の態様に含まれる。また減圧加熱機１３内
の減圧雰囲気を保つために、真空ポンプ１５により連続
的に排気を行った。Note that as the heating source, a resistance heating element or the like may be used in addition to this, and is included in the aspect of the present invention. Further, in order to maintain a reduced pressure atmosphere inside the reduced pressure heating machine 13, exhaust was continuously performed using a vacuum pump 15.
第１図αおよびｂに示した本発明による２次被覆装責を
用いて光ファイバ素線の２次被覆を行った。その際に、
本発明の効果をよシ明らかにするため、素線はあらかじ
め、湿度１００％、温度３０℃に調節した恒温槽中に４
８時間放置し、１次被覆材に十分に吸湿きせたものを用
いた。その結果、気泡および気泡の破裂による２次被覆
表面の凹凸は一個所も発生しなかった。An optical fiber was subjected to secondary coating using the secondary coating according to the present invention shown in FIGS. 1a and 1b. At that time,
In order to clearly demonstrate the effects of the present invention, the strands were placed in a constant temperature bath at 100% humidity and 30°C in advance.
The material was left to stand for 8 hours and was used as the primary covering material after it had sufficiently absorbed moisture. As a result, no unevenness was observed on the surface of the secondary coating due to bubbles or bursting of bubbles.
本実施例と比較するため、第３図に示した従来の光ファ
イバ２次被覆装置を用いて、すなわち真空ポンプ１５を
直結した減圧加熱機１３を取シ外して２次被覆を行った
。その他の条件は上記実施例と同じとした。その結果、
１００個／Ｋｍの頻度で気泡または気泡破裂による２次
被覆表面の凹凸が生じた。For comparison with this example, secondary coating was performed using the conventional optical fiber secondary coating apparatus shown in FIG. 3, that is, by removing the vacuum heater 13 directly connected to the vacuum pump 15. Other conditions were the same as in the above example. the result,
Irregularities occurred on the surface of the secondary coating due to bubbles or bursting of bubbles at a frequency of 100 pieces/Km.
以上説明したように本発明に：れば、光ファイバ素線に
２次被覆材を塗布する直前に、光ファイバ素線を減圧雰
囲気中で加熱する処理を行い、１次被覆の吸湿または１
次被覆中の揮発性低分子量成分を強制揮発させ除去する
ことから、２次役覆表百には、気泡または気泡の破裂に
よる凹凸の発生を抑止でき、滑らかな２次被覆を安定か
つ容易に行うことができる。As explained above, according to the present invention, immediately before applying the secondary coating material to the optical fiber strand, the optical fiber strand is heated in a reduced pressure atmosphere to prevent moisture absorption of the primary coating.
Since the volatile low molecular weight components in the secondary coating are forcibly evaporated and removed, it is possible to suppress the occurrence of unevenness due to bubbles or bursting of bubbles in the secondary coating, making it possible to form a smooth secondary coating stably and easily. It can be carried out.
第１図α、ｂは本発明の光７アイパ２次被覆装置の構成
概要および減圧加熱機の実施例の構成概要を示す図、
第２図は典型的な光ファイバの被覆概略図、第３図は従
来の光ファイバ２次技ｎ 袈ａの構成慨要図、
第４図ａ、ｂは従来技術による２次被覆の表面状態の例
を説明する図である。
１・・・光ファイバ素線
２・・・２次被覆塗布光７アイパ素線
３・・・２次被覆光ファイバ
４・・・クロスヘッド
５・・−冷却槽
６・・・巻取ボビン
７・・・繰出ボビン
９・・・１次被覆
１０・・・２次被覆
１１・・・気泡
１２・・・気泡の破裂
１′５・・・減圧加熱機
１４・・・赤外綿ランプ
１５・・・真空ポンプFigures 1 α and b are diagrams showing an outline of the configuration of the Optical 7 Eyeper secondary coating device of the present invention and an outline of the configuration of an embodiment of the vacuum heating machine; Figure 2 is a schematic diagram of coating a typical optical fiber; The figure is a schematic diagram of the configuration of a conventional optical fiber secondary technique n-shape, and FIGS. 4a and 4b are diagrams illustrating an example of the surface condition of the secondary coating according to the conventional technique. 1... Optical fiber strand 2... Secondary coating coating light 7 Eyepa strand 3... Secondary coating optical fiber 4... Crosshead 5...-Cooling tank 6... Winding bobbin 7 ...Feeding bobbin 9...Primary coating 10...Secondary coating 11...Bubble 12...Bubble bursting 1'5...Decompression heating machine 14...Infrared cotton lamp 15... ··Vacuum pump
Claims (3)
ドにより加熱・溶融した２次被覆材を塗布した後、冷却
槽を通して２次被覆材を冷却・硬化する光ファイバの２
次被覆方法において、 前記光ファイバ素線に２次被覆材を塗布する直前に、 前記光ファイバ素線を減圧雰囲気中で加熱する工程を含
んでなる ことを特徴とする光ファイバの２次被覆方法。(1) After applying the secondary coating material heated and melted by a crosshead to the optical fiber strand that has been coated with the primary coating, the secondary coating material is cooled and hardened through a cooling tank.
A secondary coating method for an optical fiber, the method comprising the step of heating the optical fiber in a reduced pressure atmosphere immediately before applying a secondary coating to the optical fiber. .
次被覆材の加熱・溶融した熱可塑性樹脂を光ファイバ素
線に塗布するクロスヘッドと、クロスヘッドにより塗布
した光ファイバ素線の２次被覆材の熱可塑性樹脂を冷却
・硬化する冷却槽から構成される光ファイバの２次被覆
装置において、前記クロスヘッドの直前に配置した、 前記光ファイバ素線を減圧雰囲気中で加熱して挿通する
減圧加熱機を備えてなる ことを特徴とする光ファイバの２次被覆装置。(2) Insert the optical fiber with the primary coating, and
Consisting of a crosshead that applies the heated and melted thermoplastic resin of the secondary coating material to the optical fiber strand, and a cooling tank that cools and hardens the thermoplastic resin of the secondary coating material of the optical fiber strand applied by the crosshead. A secondary coating device for an optical fiber, comprising: a vacuum heating machine disposed immediately before the crosshead that heats the optical fiber strand in a vacuum atmosphere and inserts the fiber. Secondary coating equipment.
向に内蔵並置した赤外綿ランプと、内部減圧用真空ポン
プを備えてなることを特徴とする特許請求の範囲第２項
記載の光ファイバの２次被覆装置。(3) The reduced pressure heating device is characterized in that it is equipped with an infrared cotton lamp built in and arranged in parallel in the insertion direction of the optical fiber strand, and a vacuum pump for internal depressurization. Secondary coating equipment for optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61186457A JPS6345150A (en) | 1986-08-08 | 1986-08-08 | Method of secondary coating for optical fiber and device therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61186457A JPS6345150A (en) | 1986-08-08 | 1986-08-08 | Method of secondary coating for optical fiber and device therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6345150A true JPS6345150A (en) | 1988-02-26 |
Family
ID=16188795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61186457A Pending JPS6345150A (en) | 1986-08-08 | 1986-08-08 | Method of secondary coating for optical fiber and device therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6345150A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6060952A (en) * | 1983-09-14 | 1985-04-08 | Furukawa Electric Co Ltd:The | Manufacture of coated optical fiber |
| JPS60195039A (en) * | 1984-03-17 | 1985-10-03 | Fujikura Ltd | Manufacture of optical fiber |
| JPS6283338A (en) * | 1985-10-04 | 1987-04-16 | Fujitsu Ltd | Coating method for optical fiber |
-
1986
- 1986-08-08 JP JP61186457A patent/JPS6345150A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6060952A (en) * | 1983-09-14 | 1985-04-08 | Furukawa Electric Co Ltd:The | Manufacture of coated optical fiber |
| JPS60195039A (en) * | 1984-03-17 | 1985-10-03 | Fujikura Ltd | Manufacture of optical fiber |
| JPS6283338A (en) * | 1985-10-04 | 1987-04-16 | Fujitsu Ltd | Coating method for optical fiber |
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