JPH092844A - Production of optical fiber wire - Google Patents
Production of optical fiber wireInfo
- Publication number
- JPH092844A JPH092844A JP7150745A JP15074595A JPH092844A JP H092844 A JPH092844 A JP H092844A JP 7150745 A JP7150745 A JP 7150745A JP 15074595 A JP15074595 A JP 15074595A JP H092844 A JPH092844 A JP H092844A
- Authority
- JP
- Japan
- Prior art keywords
- coating material
- covering material
- photoinitiator
- primary
- maximum absorption
- 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
Landscapes
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、光ファイバ素線の製
法に関し、光ファイバ裸線上に紫外線硬化型樹脂からな
る一次被覆材および二次被覆材を塗布し、これに紫外線
を照射して一次および二次被覆材を一挙に硬化させる際
に、内側の一次被覆材の紫外線による硬化が十分に進行
するようにしたものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an optical fiber bare wire, which is obtained by applying a primary coating material and a secondary coating material made of an ultraviolet curable resin on a bare optical fiber and irradiating the primary coating material with ultraviolet rays to the primary coating material. Further, when the secondary coating material is cured all at once, the curing of the inner primary coating material by ultraviolet rays is sufficiently advanced.
【０００２】[0002]
【従来の技術】光ファイバ素線の製法として、溶融紡糸
直後の光ファイバ裸線上に紫外線硬化型樹脂からなる一
次被覆材を塗布し、引きつづいてこの上に紫外線硬化型
樹脂からなる二次被覆材を塗布したのち、紫外線照射を
行い、一次および二次被覆材を同時に硬化させる方法が
検討されている。この製法は、生産速度を律速する紫外
線照射硬化工程が１回で済むことから、光ファイバの線
引速度が５００ｍ／分以上の高速線引に好適なものとし
てその実用化が進められている。2. Description of the Related Art As a method for producing an optical fiber strand, a primary coating material made of an ultraviolet curable resin is applied onto a bare optical fiber immediately after melt spinning, and then a secondary coating made of an ultraviolet curable resin is applied thereon. A method of applying the material and then irradiating it with ultraviolet rays to simultaneously cure the primary and secondary coating materials has been studied. Since this manufacturing method requires only one ultraviolet irradiation curing step for controlling the production rate, it is being put into practical use as being suitable for high-speed drawing with an optical fiber drawing speed of 500 m / min or more.
【０００３】ところが、この製法にあっては紫外線が二
次被覆材の上から照射されるため、外側の二次被覆材の
紫外線による硬化は十分進行するものの、内側の一次被
覆材には二次被覆材を透過した紫外線のみが到達するの
で、硬化に必要な紫外線が不足し、一次被覆材の硬化が
十分に進行しない現象が生じることがあった。However, in this manufacturing method, since ultraviolet rays are radiated from above the secondary coating material, the curing of the outer secondary coating material with ultraviolet rays progresses sufficiently, but the secondary coating material on the inner primary coating material is secondary. Since only the ultraviolet rays that have passed through the coating material arrive, the ultraviolet rays necessary for curing may be insufficient and the phenomenon that the curing of the primary coating material does not proceed sufficiently may occur.
【０００４】[0004]
【発明が解決しようとする課題】よって、この発明にお
ける課題は、光ファイバ裸線上に塗布された一次被覆材
と二次被覆材とを１回の紫外線照射で同時に硬化させる
際に、内側の一次被覆材にも十分な紫外線が到達し、一
次被覆材の硬化が十分に進行するようにすることであ
る。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an inner primary coating when simultaneously curing a primary coating material and a secondary coating material applied on a bare optical fiber with one ultraviolet irradiation. Sufficient ultraviolet light reaches the coating material so that the primary coating material is sufficiently cured.
【０００５】[0005]
【課題を解決するための手段】かかる課題は、一次被覆
材に添加される光開始剤の最大吸収波長と二次被覆材に
添加される最大吸収波長とを異ならせることで解決しう
る。また、最大吸収波長の差は３０〜１００ｎｍの範囲
とすることが、一次被覆材の硬化が十分進行して好まし
い。This problem can be solved by making the maximum absorption wavelength of the photoinitiator added to the primary coating material different from the maximum absorption wavelength of the secondary coating material. Further, it is preferable that the difference between the maximum absorption wavelengths is in the range of 30 to 100 nm because the primary coating material is sufficiently cured.
【０００６】以下、本発明を詳しく説明する。本発明で
用いられる一次および二次被覆材は、いずれも紫外線硬
化性を有するもので、ウレタンアクリレート、エポキシ
アクリレートなどの不飽和基を有する光重合性オリゴマ
ーに、重合性希釈剤としてのアクリル系モノマーなどの
モノマー、光エネルギーを吸収してラジカルなどの活性
種を発生する光開始剤、ミヒラーケトンなどの増感剤、
着色剤、充填剤などを配合したものである。そして、一
次被覆材は、硬化後の被覆材のヤング率が０．１〜１ｋ
ｇ／ｍｍ2の範囲の軟質の樹脂となるように、また二次
被覆材は硬化後の被覆材のヤング率が５０〜２００ｋｇ
／ｍｍ2 の範囲の硬質の樹脂となるように、その配合組
成等が定められている。Hereinafter, the present invention will be described in detail. The primary and secondary coating materials used in the present invention are both UV curable, and include a photopolymerizable oligomer having an unsaturated group such as urethane acrylate and epoxy acrylate, and an acrylic monomer as a polymerizable diluent. Monomers, photoinitiators that absorb light energy and generate active species such as radicals, sensitizers such as Michler's ketone,
It contains a colorant, a filler and the like. The Young's modulus of the cured coating material of the primary coating material is 0.1 to 1 k.
In order to obtain a soft resin in the range of g / mm 2, the secondary coating material has a Young's modulus of the cured coating material of 50 to 200 kg.
The compounding composition and the like are determined so that the resin is a hard resin in the range of / mm 2 .
【０００７】また、上記光開始剤としては、２，４，６
−トリメチルベンゾイルジフェニルホスフィンオキサイ
ド（ＴＭＤＰＯ）、ジエトキシホスフィンオキサイド
（ＤＥＡＰ）、α−アミノアセトフェノン、ヒドロキシ
アセトフェノン、ベンゾフェン、アンスラキノン、チオ
キサントンなどが用いられるが、本発明では一次被覆材
に添加される光開始剤の最大吸収波長と二次被覆材に添
加される光開始剤の最大吸収波長とが異なるように光開
始剤がそれぞれ選択される。The photoinitiator is 2, 4, 6
-Trimethylbenzoyldiphenylphosphine oxide (TMDPO), diethoxyphosphine oxide (DEAP), α-aminoacetophenone, hydroxyacetophenone, benzophene, anthraquinone, thioxanthone, etc. are used. The photoinitiators are selected so that the maximum absorption wavelength of the agent and the maximum absorption wavelength of the photoinitiator added to the secondary coating material are different.
【０００８】図１は、２種の光開始剤の吸光特性の例を
示したもので、実線で示した吸光特性を有する光開始剤
Ａはその最大吸収波長が３８０ｎｍ付近にあり、破線で
示した吸光特性を有する光開始剤Ｂはその最大吸収波長
が３６０ｎｍ付近にある。このように、光開始剤には固
有の最大吸収波長があり、この波長の差が３０〜１００
ｎｍ、好ましくは４０〜１００ｎｍの範囲となるよう
に、一次被覆材および二次被覆材にそれぞれ添加される
光開始剤が選択される。FIG. 1 shows an example of the light absorption characteristics of two types of photoinitiators. The photoinitiator A having the light absorption characteristics shown by the solid line has a maximum absorption wavelength near 380 nm and is shown by the broken line. The maximum absorption wavelength of the photoinitiator B having the light absorption characteristic is around 360 nm. As described above, the photoinitiator has an inherent maximum absorption wavelength, and the wavelength difference is 30 to 100.
The photoinitiator added to the primary coating material and the secondary coating material is selected so as to be in the range of 40 nm, preferably 40 to 100 nm.
【０００９】最大吸収波長の差が３０ｎｍ未満となる
と、一次被覆材の紫外線硬化を十分に進行させる効果が
得られず、一方最大吸収波長が１００ｎｍを越える光開
始剤の組み合わせは実際上得られない。具体的な光開始
剤の組み合わせとしては、例えば２，４，６−トリメチ
ルベンゾイルジフェニルホスフィンオキサイド（ＴＭＤ
ＰＯ）の最大吸収波長が３８０ｎｍであるので、これと
組み合わせる光開始剤にはジエトキシホスフィンオキサ
イド（ＤＥＡＰ，最大吸収波長３４０ｎｍ）、α−アミ
ノアセトフェノン（最大吸収波長３０５ｎｍ）、ヒドロ
キシアセトフェノン（最大吸収波長３２５ｎｍ）などが
用いられる。光開始剤の添加量は被覆材の１．０〜３．
０重量％の範囲とされる。If the difference between the maximum absorption wavelengths is less than 30 nm, the effect of sufficiently promoting the ultraviolet curing of the primary coating material cannot be obtained, while the combination of photoinitiators having the maximum absorption wavelength exceeding 100 nm cannot be practically obtained. . Specific examples of the combination of photoinitiators include 2,4,6-trimethylbenzoyldiphenylphosphine oxide (TMD).
Since the maximum absorption wavelength of PO) is 380 nm, the photoinitiator to be combined with this is diethoxyphosphine oxide (DEAP, maximum absorption wavelength 340 nm), α-aminoacetophenone (maximum absorption wavelength 305 nm), hydroxyacetophenone (maximum absorption wavelength). 325 nm) or the like is used. The amount of photoinitiator added is 1.0 to 3.
The range is 0% by weight.
【００１０】このような条件を満たす一次被覆材および
二次被覆材をそれぞれ用意し、溶融紡糸、直後の光ファ
イバ裸線にこれらを塗布する。この塗布操作には、２個
の塗布ダイスを用い、第１の塗布ダイスで一次被覆材を
塗布し、引きつづいて第２の塗布ダイスでこの上に二次
被覆材を塗布し、これを紫外線照射装置に導いて紫外線
硬化させる方法と、１個の塗布ダイスを用い、一挙に一
次被覆材と二次被覆材とを塗布し、紫外線照射装置に導
き、紫外線硬化させる方法とがあり、いずれでもよい。
紫外線照射装置としては、波長２５０〜５００ｎｍの波
長域の連続スペクトルの紫外線を照射できるものが好ま
しい。A primary coating material and a secondary coating material satisfying the above conditions are prepared respectively, and they are applied to a bare optical fiber immediately after melt spinning and bare. For this coating operation, two coating dies are used, the first coating die is used to coat the primary coating material, and then the second coating die is used to coat the secondary coating material thereon. There is a method of guiding to an irradiation device and ultraviolet curing, and a method of using a single coating die to apply a primary coating material and a secondary coating material all at once, leading to an ultraviolet irradiation device, and performing ultraviolet curing. Good.
As the ultraviolet irradiation device, a device that can irradiate ultraviolet rays having a continuous spectrum in the wavelength range of 250 to 500 nm is preferable.
【００１１】このような光ファイバ素線の製法にあって
は、一次被覆材の光開始剤の最大吸収波長と二次被覆材
の光開始剤の最大吸収波長とが異なるため、外側の二次
被覆材で吸収された波長以外の波長域の紫外線が内側の
一次被覆材にまで到達し、この紫外線によって一次被覆
材が硬化することになる。このため、一次被覆材が十分
に硬化し、硬化不良となることが防止される。In such a method for producing an optical fiber element wire, since the maximum absorption wavelength of the photoinitiator of the primary coating material is different from the maximum absorption wavelength of the photoinitiator of the secondary coating material, the secondary Ultraviolet light in a wavelength range other than the wavelength absorbed by the coating material reaches the inner primary coating material, and the primary coating material is cured by the ultraviolet light. Therefore, it is possible to prevent the primary coating material from being sufficiently cured to cause poor curing.
【００１２】以下、具体例を示して本発明の作用および
効果を明確にする。 （実施例）ウレタンアクリレート系光重合性オリゴマー
を主体とする紫外線硬化型樹脂に添加される光開始剤を
変えて一次被覆材および二次被覆材を作成し、これを光
ファイバ裸線上に順次塗布し、紫外線照射してこれらを
同時に硬化させて光ファイバ素線とした。得られた光フ
ァイバ素線の一次被覆材のゲル分率（％）を測定し、一
次被覆材の硬化度合を評価した。The action and effect of the present invention will be clarified below with reference to specific examples. (Example) A primary coating material and a secondary coating material were prepared by changing the photoinitiator added to the ultraviolet curable resin mainly composed of a urethane acrylate-based photopolymerizable oligomer, and the primary coating material and the secondary coating material were sequentially coated on the bare optical fiber. Then, they were irradiated with ultraviolet rays and cured at the same time to obtain optical fiber strands. The gel fraction (%) of the obtained primary coating material of the optical fiber was measured to evaluate the degree of curing of the primary coating material.
【００１３】表１に、一次被覆材中の光開始剤の種類お
よびその最大吸収波長、二次被覆材中の光開始剤の種類
およびその最大吸収波長、一次被覆材のゲル分率（％）
および紡糸速度を示した。Table 1 shows the kind and maximum absorption wavelength of the photoinitiator in the primary coating material, the kind and maximum absorption wavelength of the photoinitiator in the secondary coating material, and the gel fraction (%) of the primary coating material.
And spinning speed.
【００１４】[0014]
【表１】 [Table 1]
【００１５】表１の結果から、一次被覆材中の光開始剤
の最大吸収波長と二次被覆材中の光開始剤の最大吸収波
長との差が３５ｎｍ以上であれば、一次被覆材のゲル分
率が９０％となることがわかる。From the results shown in Table 1, if the difference between the maximum absorption wavelength of the photoinitiator in the primary coating material and the maximum absorption wavelength of the photoinitiator in the secondary coating material is 35 nm or more, the gel of the primary coating material is obtained. It can be seen that the fraction is 90%.
【００１６】[0016]
【発明の効果】以上説明したように、本発明の光ファイ
バ素線の製法によれば、一次被覆材と二次被覆材とを塗
布し、これらを同時に紫外線硬化させる際において、内
側の一次被覆材の紫外線硬化を十分に進行させることが
できる。As described above, according to the method for producing an optical fiber element wire of the present invention, when the primary coating material and the secondary coating material are applied and they are simultaneously cured by ultraviolet rays, the inner primary coating is applied. UV curing of the material can be sufficiently advanced.
【図１】 本発明で用いられる光開始剤の吸光特性の例
を示すグラフである。FIG. 1 is a graph showing an example of absorption characteristics of a photoinitiator used in the present invention.
フロントページの続き (72)発明者 荒木 真治 千葉県佐倉市六崎1440番地 株式会社フジ クラ佐倉工場内Front page continuation (72) Inventor Shinji Araki 1440 Rokuzaki, Sakura City, Chiba Fujikura Ltd. Sakura Factory
Claims (2)
らなる一次被覆材と二次被覆材とを順次塗布したのち、
紫外線を照射して一次被覆材および二次被覆材を同時に
硬化させる光ファイバ素線の製法において、 一次被覆材に含まれる光開始剤の最大吸収波長と、二次
被覆材に含まれる光開始剤の最大吸収波長とを異ならせ
たことを特徴とする光ファイバ素線の製法。1. A primary coating material and a secondary coating material made of an ultraviolet curable resin are applied on a bare optical fiber in order,
In the method of manufacturing an optical fiber element wire in which ultraviolet rays are irradiated to simultaneously cure the primary coating material and the secondary coating material, the maximum absorption wavelength of the photoinitiator contained in the primary coating material and the photoinitiator contained in the secondary coating material A method for manufacturing an optical fiber elemental wire, characterized in that the maximum absorption wavelength of is different.
あることを特徴とする請求項１記載の光ファイバ素線の
製法。2. The method for producing an optical fiber elemental wire according to claim 1, wherein the difference in maximum absorption wavelength is 30 to 100 nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7150745A JPH092844A (en) | 1995-06-16 | 1995-06-16 | Production of optical fiber wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7150745A JPH092844A (en) | 1995-06-16 | 1995-06-16 | Production of optical fiber wire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH092844A true JPH092844A (en) | 1997-01-07 |
Family
ID=15503498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7150745A Pending JPH092844A (en) | 1995-06-16 | 1995-06-16 | Production of optical fiber wire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH092844A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6018605A (en) * | 1997-12-31 | 2000-01-25 | Siecor Operations | Photoinitiator--tuned optical fiber and optical fiber ribbon and method of making the same |
| US10838159B2 (en) | 2016-09-30 | 2020-11-17 | Fujikura Ltd. | Optical fiber colored core wire, optical fiber cable, and method of manufacturing optical fiber colored core wire |
| US10908373B2 (en) | 2016-09-30 | 2021-02-02 | Fujikura Ltd. | Optical fiber ribbon, optical fiber cable, and method of manufacturing optical fiber ribbon |
-
1995
- 1995-06-16 JP JP7150745A patent/JPH092844A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6018605A (en) * | 1997-12-31 | 2000-01-25 | Siecor Operations | Photoinitiator--tuned optical fiber and optical fiber ribbon and method of making the same |
| US10838159B2 (en) | 2016-09-30 | 2020-11-17 | Fujikura Ltd. | Optical fiber colored core wire, optical fiber cable, and method of manufacturing optical fiber colored core wire |
| US10908373B2 (en) | 2016-09-30 | 2021-02-02 | Fujikura Ltd. | Optical fiber ribbon, optical fiber cable, and method of manufacturing optical fiber ribbon |
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