JPH0130772B2 - - Google Patents
Info
- Publication number
- JPH0130772B2 JPH0130772B2 JP58239378A JP23937883A JPH0130772B2 JP H0130772 B2 JPH0130772 B2 JP H0130772B2 JP 58239378 A JP58239378 A JP 58239378A JP 23937883 A JP23937883 A JP 23937883A JP H0130772 B2 JPH0130772 B2 JP H0130772B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- resin composition
- liquid resin
- pressure
- coating
- 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
- 239000013307 optical fiber Substances 0.000 claims description 41
- 239000011342 resin composition Substances 0.000 claims description 35
- 239000007788 liquid Substances 0.000 claims description 29
- 238000000576 coating method Methods 0.000 claims description 22
- 239000011248 coating agent Substances 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000011521 glass Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000005253 cladding Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Surface Treatment Of Glass Fibres Or Filaments (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被覆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 coating optical fiber.
光フアイバは棒状ガラス母材を加熱炉で加熱し
線引きして得られるが、そのままではぜい弱であ
り、しかも表面の微小クラツクが空気中で拡大成
長するという性質があるため、樹脂組成物を線引
き後の光フアイバの外周に被覆して実用化してい
る。 Optical fiber is obtained by heating a rod-shaped glass base material in a heating furnace and drawing it, but it is fragile as it is, and furthermore, micro cracks on the surface have the property of expanding and growing in the air, so after drawing the resin composition. It has been put into practical use by coating the outer periphery of an optical fiber.
この被覆方法として現在多用されているのは、
液状樹脂組成物を容器に収容し、この容器の中央
に線引き後の光フアイバを挿通することにより、
光フアイバに樹脂組成物を塗布する方法である。 Currently, the most commonly used coating method is:
By storing the liquid resin composition in a container and inserting the drawn optical fiber through the center of the container,
This is a method of applying a resin composition to an optical fiber.
この方法は、光フアイバの線引きと同時に被覆
ができ、しかも光フアイバに無理な応力がかから
ないため工業上優れた方法であるが、線引き速度
即ち被覆速度を速くしようとすると光フアイバ表
面に樹脂組成物が十分に着かず、気泡が付着する
という現象が発生する。 This method is an industrially superior method because it can coat the optical fiber at the same time it is drawn and does not apply undue stress to the optical fiber. The phenomenon occurs in which the liquid does not adhere sufficiently and air bubbles adhere to the surface.
このように、光フアイバ表面に気泡が付着した
状態では、光フアイバの機械的特性が著しく劣
り、当然所期の被覆目的を達成しない。 In this manner, when air bubbles are attached to the surface of the optical fiber, the mechanical properties of the optical fiber are significantly deteriorated, and the intended purpose of coating is naturally not achieved.
本発明者らの検討によれば、この原因は、光フ
アイバの挿通移動速度に対してその周囲の液状樹
脂組成物が十分追従できず、移動速度の差が大き
くなりすぎることにあると考えられる。 According to the studies of the present inventors, it is thought that the cause of this is that the liquid resin composition around the optical fiber cannot sufficiently follow the insertion and movement speed of the optical fiber, and the difference in movement speed becomes too large. .
この解決策として、容器内の液状樹脂組成物に
圧力を加える方法（例えば特開昭57−7844号参
照）及び容器下方の雰囲気を減圧する方法（例え
ば特開昭55−140737号参照）が考えられている。 As a solution to this problem, a method of applying pressure to the liquid resin composition in the container (see, for example, JP-A-57-7844) and a method of reducing the pressure of the atmosphere below the container (see, for example, JP-A-55-140,737) are considered. It is being
しかし、容器下部の出口径は一定であり（これ
を変化させた場合の制御は極めて複雑となる）、
上記のような一方的な圧力の加減では、外気圧の
影響を直接受けることになり、光フアイバの被覆
というミクロンオーダーの微妙なコントロールに
追従させることは容易ではない。 However, the outlet diameter at the bottom of the container is constant (control would be extremely complicated if this was changed);
If the pressure is adjusted unilaterally as described above, it will be directly affected by the external pressure, and it is not easy to follow the delicate control on the micron order of coating the optical fiber.
本発明は斯かる状況に鑑み、前記のような光フ
アイバ表面への気泡付着を抑止し、樹脂組成物を
十分に付着させると共に被覆厚を正確に制御し、
光フアイバの機械的特性、信頼性を高めることの
できる光フアイバの被覆方法を提供することを目
的とする。 In view of this situation, the present invention suppresses the adhesion of air bubbles to the optical fiber surface as described above, allows the resin composition to sufficiently adhere, and accurately controls the coating thickness.
An object of the present invention is to provide a method for coating an optical fiber that can improve the mechanical properties and reliability of the optical fiber.
［発明の概要］
本発明は、光フアイバ用ガラス母材を加熱炉で
加熱線引きし、線引き後の裸光フアイバを液状樹
脂組成物塗布装置に通すことにより液状樹脂組成
物を塗布し、その後光フアイバに塗布された液状
樹脂組成物を硬化させる光フアイバの被覆方法に
おいて、前記液状樹脂組成物塗布装置は液状樹脂
組成物を収納する収納容器を有し、該収納容器の
上部空間と下方空間とを連結する連結管を有し、
連結管に設けられたポンプによつて前記上部空間
の圧力が前記下方空間の圧力より高くなるように
し、該圧力差が一定の範囲に維持されるように制
御装置によつて制御することを特徴とする光フア
イバの被覆方法である。[Summary of the Invention] The present invention involves heating and drawing a glass base material for an optical fiber in a heating furnace, applying a liquid resin composition by passing the drawn bare optical fiber through a liquid resin composition coating device, and then coating the bare optical fiber with a liquid resin composition. In an optical fiber coating method for curing a liquid resin composition applied to the fiber, the liquid resin composition coating device has a storage container that stores the liquid resin composition, and an upper space and a lower space of the storage container. It has a connecting pipe that connects the
The pressure in the upper space is made higher than the pressure in the lower space by a pump provided in the connecting pipe, and the pressure difference is controlled by a control device so as to be maintained within a certain range. This is a method of coating optical fiber.
［実施例］
本発明の構成を、一実施例を示す図面を参照し
て具体的に説明する。[Example] The configuration of the present invention will be specifically described with reference to the drawings showing one example.
図において、１は棒状ガラス母材であり、光フ
アイバの構成要素として光学的に必要なコア、ク
ラツド等が全て備わつた構造のものである。 In the figure, reference numeral 1 denotes a rod-shaped glass base material, which has a structure that is equipped with all optically necessary cores, claddings, etc. as constituent elements of an optical fiber.
この棒状ガラス母材１を加熱炉２で加熱線引き
し、線引き後の裸光フアイバ３を液状樹脂組成物
塗布装置４に通す。 This rod-shaped glass preform 1 is heated and drawn in a heating furnace 2, and the drawn bare optical fiber 3 is passed through a liquid resin composition coating device 4.
液状樹脂組成物塗布装置４は液状樹脂組成物５
を収納する収納容器４１を有し、該収納容器４１
の上部空間４２と下方空間４３とを連結する連結
管４４を有し、連結管４４に設けられたポンプ４
５によつて前記上部空間４２の圧力が前記下方空
間４３の圧力より高くなるように設定されてい
る。 The liquid resin composition application device 4 applies the liquid resin composition 5
It has a storage container 41 that stores the storage container 41.
It has a connecting pipe 44 that connects an upper space 42 and a lower space 43, and a pump 4 provided in the connecting pipe 44.
5, the pressure in the upper space 42 is set to be higher than the pressure in the lower space 43.
６は制御装置であり、収納容器４１の上部空間
４２と下方空間４３の圧力を検知し、この圧力差
が一定の範囲に維持されるようにポンプ４５を制
御する。 A control device 6 detects the pressure between the upper space 42 and the lower space 43 of the storage container 41, and controls the pump 45 so that this pressure difference is maintained within a certain range.
即ち、このような液状樹脂組成物塗布装置４の
上から下へ光フアイバを通すと、収納容器４１の
上部空間４２の圧力が高く、かつ収納容器４１の
下方空間４３の圧力が低く設定されているので、
液状樹脂組成物５が収納容器４１の下部出口から
引き出され、光フアイバに塗布された状態で出て
くる。 That is, when the optical fiber is passed from the top to the bottom of such a liquid resin composition application device 4, the pressure in the upper space 42 of the storage container 41 is set high and the pressure in the lower space 43 of the storage container 41 is set low. Because there are
The liquid resin composition 5 is drawn out from the lower outlet of the storage container 41 and comes out in a state coated on the optical fiber.
このとき、上部空間４２の圧力と下方空間４３
の圧力との差が大きく変動すると、液状樹脂組成
物５の光フアイバへの塗布量に変動を生じ被覆後
の光フアイバ外径に変動を生じる。 At this time, the pressure in the upper space 42 and the lower space 43
If the difference between the pressure and the pressure varies greatly, the amount of the liquid resin composition 5 applied to the optical fiber will vary, and the outer diameter of the coated optical fiber will vary.
外径変動は即ち機械的特性の劣化に通じるの
で、これを防止するため、制御装置６によつて収
納容器４１の上部空間４２と下方空間４３との圧
力差を一定の範囲に維持するよう制御する。 Fluctuations in the outer diameter lead to deterioration of mechanical properties, so in order to prevent this, the control device 6 controls the pressure difference between the upper space 42 and lower space 43 of the storage container 41 to be maintained within a certain range. do.
この圧力差の適切な値は、光フアイバの線引き
速度、液状樹脂組成物５の粘度及び収納容器４１
の形状によつて異なる値となる。 An appropriate value for this pressure difference is determined by the drawing speed of the optical fiber, the viscosity of the liquid resin composition 5, and the storage container 41.
The value differs depending on the shape of.
７は加熱装置であり、光フアイバ表面に塗布さ
れた液状樹脂組成物５を硬化するためのものであ
る。 7 is a heating device for curing the liquid resin composition 5 applied to the surface of the optical fiber.
８は樹脂組成物によつて被覆された光フアイバ
である。 8 is an optical fiber coated with a resin composition.
尚、液状樹脂組成物塗布装置４は殆ど閉鎖系で
あり、ポンプ４５の能力を上部空間４２と下方空
間４３の圧力差が一定となるように制御すれば、
外気圧の変化に係わらず、光フアイバ表面の樹脂
組成物の塗膜厚も一定となる。 Note that the liquid resin composition application device 4 is almost a closed system, and if the capacity of the pump 45 is controlled so that the pressure difference between the upper space 42 and the lower space 43 is constant,
Regardless of changes in external pressure, the coating thickness of the resin composition on the surface of the optical fiber remains constant.
［発明の効果］
従来の方法では、光フアイバの通過移動速度を
速くすると、樹脂組成物がその速度に追従できず
十分な塗布が行われないことがあつたが、以上説
明したような本発明の光フアイバの被覆方法であ
れば、液状樹脂組成物収納容器の上部空間と下方
空間とに圧力差を設けたので液状樹脂組成物の移
動速度が速くなり、光フアイバ表面に十分に液状
樹脂組成物を塗布することができ、気泡の付着防
止もできる。[Effects of the Invention] In the conventional method, when the speed of passage of the optical fiber was increased, the resin composition could not follow the speed and sufficient coating was not achieved.However, the present invention as described above In this optical fiber coating method, since a pressure difference is provided between the upper space and the lower space of the liquid resin composition storage container, the moving speed of the liquid resin composition is increased, and the liquid resin composition is sufficiently coated on the surface of the optical fiber. It can be used to apply substances and also prevent air bubbles from forming.
又、制御装置によつて収納容器の上部空間と下
方空間との圧力差が一定の範囲に設定されている
ので、外気圧等の変動によつて、樹脂組成物の塗
膜厚がむやみに変動してしまうこともなく、一定
の範囲に保持できる。 In addition, since the pressure difference between the upper space and the lower space of the storage container is set within a certain range by the control device, the coating thickness of the resin composition may fluctuate unnecessarily due to changes in external pressure, etc. It can be maintained within a certain range without causing any damage.
この結果、光フアイバの機械的特性及び信頼性
が著しく向上する。 As a result, the mechanical properties and reliability of the optical fiber are significantly improved.
図は本発明の一実施例を示す説明図である。
１：棒状ガラス母材、２：加熱炉、３：裸光フ
アイバ、４：液状樹脂組成物塗布装置、４１：収
納容器、４２：上部空間、４３：下方空間、４
４：連結管、４５：ポンプ、５：液状樹脂組成
物、６：制御装置、７：加熱装置、８：被覆光フ
アイバ。
The figure is an explanatory diagram showing one embodiment of the present invention. 1: Rod-shaped glass base material, 2: Heating furnace, 3: Bare optical fiber, 4: Liquid resin composition coating device, 41: Storage container, 42: Upper space, 43: Lower space, 4
4: connecting pipe, 45: pump, 5: liquid resin composition, 6: control device, 7: heating device, 8: coated optical fiber.
Claims (1)
線引きし、線引き後の裸光フアイバ３を液状樹脂
組成物塗布装置４に通すことにより液状樹脂組成
物５を塗布し、その後光フアイバに塗布された液
状樹脂組成物５を硬化させる光フアイバの被覆方
法において、前記液状樹脂組成物塗布装置４は液
状樹脂組成物５を収納する収納容器４１を有し、
該収納容器４１の上部空間４２と下方空間４３と
を連結する連結管４４を有し、連結管４４に設け
られたポンプ４５によつて前記上部空間４２の圧
力が前記下方空間４３の圧力より高くなるように
し、該圧力差が一定の範囲に維持されるように制
御装置６によつてポンプ４５を制御することを特
徴とする光フアイバの被覆方法。1 A glass base material 1 for optical fiber is heated and drawn in a heating furnace 2, and a liquid resin composition 5 is applied by passing the drawn bare optical fiber 3 through a liquid resin composition coating device 4, and then applied to the optical fiber. In the optical fiber coating method for curing the liquid resin composition 5, the liquid resin composition coating device 4 has a storage container 41 that stores the liquid resin composition 5,
It has a connecting pipe 44 that connects an upper space 42 and a lower space 43 of the storage container 41, and a pump 45 provided in the connecting pipe 44 makes the pressure in the upper space 42 higher than the pressure in the lower space 43. A method for coating an optical fiber, characterized in that the pump 45 is controlled by the control device 6 so that the pressure difference is maintained within a certain range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58239378A JPS60131843A (en) | 1983-12-19 | 1983-12-19 | Covering method of optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58239378A JPS60131843A (en) | 1983-12-19 | 1983-12-19 | Covering method of optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60131843A JPS60131843A (en) | 1985-07-13 |
| JPH0130772B2 true JPH0130772B2 (en) | 1989-06-21 |
Family
ID=17043884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58239378A Granted JPS60131843A (en) | 1983-12-19 | 1983-12-19 | Covering method of optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60131843A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2600779B1 (en) * | 1986-06-30 | 1989-12-01 | Thomson Csf | PROCESS FOR THE SEALED METAL COATING OF AN OPTICAL FIBER AND DEVICE USING THE SAME |
| JPH03121092U (en) * | 1990-03-22 | 1991-12-11 | ||
| US5151306A (en) * | 1990-11-26 | 1992-09-29 | At&T Bell Laboratories | Methods of coating elongated strand material |
| CN108383373B (en) * | 2018-03-23 | 2020-12-01 | 烽火通信科技股份有限公司 | System parameter setting method in optical fiber drawing tower |
-
1983
- 1983-12-19 JP JP58239378A patent/JPS60131843A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60131843A (en) | 1985-07-13 |
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