JPH0776119B2 - Optical fiber manufacturing method - Google Patents
Optical fiber manufacturing methodInfo
- Publication number
- JPH0776119B2 JPH0776119B2 JP62171238A JP17123887A JPH0776119B2 JP H0776119 B2 JPH0776119 B2 JP H0776119B2 JP 62171238 A JP62171238 A JP 62171238A JP 17123887 A JP17123887 A JP 17123887A JP H0776119 B2 JPH0776119 B2 JP H0776119B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- optical fiber
- layer
- coating
- curable
- 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 - Lifetime
Links
- 239000013307 optical fiber Substances 0.000 title claims description 39
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 239000010410 layer Substances 0.000 claims description 68
- 239000011347 resin Substances 0.000 claims description 56
- 229920005989 resin Polymers 0.000 claims description 56
- 238000000576 coating method Methods 0.000 claims description 39
- 239000011248 coating agent Substances 0.000 claims description 38
- 239000003999 initiator Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 14
- 239000004925 Acrylic resin Substances 0.000 claims description 13
- 239000011247 coating layer Substances 0.000 claims description 8
- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical compound OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000011253 protective coating Substances 0.000 claims description 5
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- KCTAWXVAICEBSD-UHFFFAOYSA-N prop-2-enoyloxy prop-2-eneperoxoate Chemical compound C=CC(=O)OOOC(=O)C=C KCTAWXVAICEBSD-UHFFFAOYSA-N 0.000 claims description 3
- 229920002050 silicone resin Polymers 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 238000001723 curing Methods 0.000 description 24
- 230000000052 comparative effect Effects 0.000 description 9
- 239000007788 liquid Substances 0.000 description 5
- 239000000835 fiber Substances 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- OWYWGLHRNBIFJP-UHFFFAOYSA-N Ipazine Chemical compound CCN(CC)C1=NC(Cl)=NC(NC(C)C)=N1 OWYWGLHRNBIFJP-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 229910001507 metal halide Inorganic materials 0.000 description 3
- 150000005309 metal halides Chemical class 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- DKEGCUDAFWNSSO-UHFFFAOYSA-N 1,8-dibromooctane Chemical compound BrCCCCCCCCBr DKEGCUDAFWNSSO-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- BRHJUILQKFBMTL-UHFFFAOYSA-N [4,4-bis(dimethylamino)cyclohexa-1,5-dien-1-yl]-phenylmethanone Chemical compound C1=CC(N(C)C)(N(C)C)CC=C1C(=O)C1=CC=CC=C1 BRHJUILQKFBMTL-UHFFFAOYSA-N 0.000 description 1
- 238000002835 absorbance Methods 0.000 description 1
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 description 1
- 239000012965 benzophenone Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012681 fiber drawing Methods 0.000 description 1
- 238000007380 fibre production Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000016 photochemical curing Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- YRHRIQCWCFGUEQ-UHFFFAOYSA-N thioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC=CC=C3SC2=C1 YRHRIQCWCFGUEQ-UHFFFAOYSA-N 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】 〔産業上の利用分野〕 本発明は光フアイバの製造方法に関し、詳しくは光フア
イバの線引工程において、樹脂を用いて光フアイバに保
護被覆を施す方法の改良に係わるものである。Description: TECHNICAL FIELD The present invention relates to a method for producing an optical fiber, and more particularly to an improvement in a method for applying a protective coating to an optical fiber using a resin in a drawing process of the optical fiber. It is a thing.
光フアイバ母材から線引きされたまゝの光フアイバは一
般に細径で機械的強度も小さいため、強度を向上し、ま
た取扱い容易とする等の目的で、この線引工程で樹脂等
を被覆して保護層を形成することが行なわれている。こ
のような光ファイバの被覆材料としては、従来の熱硬化
性樹脂にかわつて、硬化がはやく、特性の良い光硬化性
樹脂が主流となりつつある。The optical fiber drawn from the optical fiber base material is generally thin and has a small mechanical strength.Therefore, in order to improve the strength and make it easy to handle, the optical fiber is coated with resin in this drawing process. Forming a protective layer is performed. As a coating material for such an optical fiber, a photo-curable resin that is quick to cure and has excellent characteristics is becoming the mainstream in place of the conventional thermosetting resin.
光硬化性樹脂は、硬化時の照射光量によつて硬化後の樹
脂の物性例えばヤング率・破断伸び等が大きく異なると
いう特徴を有する。このために、特性の良い光硬化性樹
脂被覆光フアイバを製造する上で、照射光量を精度良く
管理することは非常に重要である。しかしながら、現実
には樹脂の照射光量を正確に把握するのは容易なことで
はない。というのは、現在広く採用されている光フアイ
バの被覆構造は、光硬化性樹脂を２層以上コーテイング
したものであり、このような多層被覆構造では、外層の
樹脂を硬化させる際にその照射光が内層の樹脂にまで到
達するため、その分を計算あるいは実測によつて算出
し、加える必要があるからである。この外層樹脂を硬化
させる際の内層樹脂への光の到達量は、当然ながら、外
層樹脂の種類，厚さ，カラーインク等の添加などにより
複雑に変化するため、内層の樹脂の真の照射光量を求め
ることは事実上不可能であつた。The photocurable resin is characterized in that the physical properties of the resin after curing, such as Young's modulus and elongation at break, vary greatly depending on the amount of irradiation light during curing. For this reason, it is very important to accurately control the irradiation light amount in order to manufacture a photocurable resin-coated optical fiber having good characteristics. However, in reality, it is not easy to accurately grasp the irradiation light amount of the resin. This is because the coating structure of optical fibers, which is widely used at present, is a coating of two or more layers of photo-curable resin. In such a multilayer coating structure, when the resin of the outer layer is cured, the irradiation light This is because the resin reaches the resin in the inner layer, and it is necessary to calculate and add that amount by calculation or actual measurement. The amount of light reaching the inner layer resin when the outer layer resin is cured naturally changes intricately depending on the type, thickness, addition of color ink, etc. of the outer layer resin, so the true amount of irradiation light of the inner layer resin It was virtually impossible to ask for.
そのため、従来技術では照射光量の下限のみを定め、そ
れ以上の光量があたつていれば良いという考え方で光量
の管理をしていた。Therefore, in the related art, only the lower limit of the irradiation light amount is set, and the light amount is managed based on the idea that it is sufficient if the irradiation amount exceeds the lower limit.
しかしながら、近年、光硬化性樹脂で被覆した光フアイ
バにおいて樹脂を硬化する際の照射光量が多くなると、
被覆層中での水素の発生量が増加する、あるいは被覆層
の劣化が早く進行し、光フアイバ伝送特性を低下させる
等の併害があることが判明してきている。つまり、従来
のように照射光量をその下限値のみで管理する方法には
非常に問題があると考えられるが、上述のように照射光
量を完全に把握することは大変困難であつた。However, in recent years, when the amount of irradiation light when curing the resin in the optical fiber coated with the photocurable resin increases,
It has been found that there are concomitant effects such as an increase in the amount of hydrogen generated in the coating layer, or a rapid deterioration of the coating layer, which deteriorates the optical fiber transmission characteristics. That is, it is considered that the conventional method of controlling the irradiation light amount only by the lower limit value thereof has a serious problem, but it is very difficult to completely grasp the irradiation light amount as described above.
本発明の目的は、このような現状での問題点を解決し
て、被覆樹脂の照射光量を管理した光硬化を可能とし、
伝送特性に優れ高品質な被覆光フアイバを製造する方法
を提供することにある。An object of the present invention is to solve the problems in the present situation as described above and enable photocuring in which the irradiation light amount of the coating resin is controlled,
An object of the present invention is to provide a method of manufacturing a high quality coated optical fiber having excellent transmission characteristics.
本発明は光フアイバ母材を加熱溶融・延伸して光フアイ
バとし、該光フアイバの周囲に光硬化性樹脂をコーテイ
ングして硬化させることにより複数層の保護被覆を有す
る光フアイバを製造する方法において、該保護被覆層数
をｎ（ｎ≧２）とすると内側から第ｋ番目（ｎ−１≧ｋ
≧１）の被覆層の樹脂中の反応開始剤の特性波長域が、
第（ｋ＋１）番目以降の被覆層の樹脂を硬化させるため
に照射する光の特性波長域からはずれるようにして被覆
を行なうことを特徴とする光ファイバの製造方法に関す
るものである。The present invention relates to a method for producing an optical fiber having a plurality of protective coatings by heating and melting an optical fiber base material to form an optical fiber, and coating a photo-curable resin around the optical fiber to cure the optical fiber. , And the number of the protective coating layers is n (n ≧ 2), the kth position from the inside (n−1 ≧ k)
The characteristic wavelength range of the reaction initiator in the resin of the coating layer of ≧ 1) is
The present invention relates to a method for manufacturing an optical fiber, which is characterized in that coating is performed so as to deviate from a characteristic wavelength range of light irradiated for curing the resin of the (k + 1) th and subsequent coating layers.
本発明においては、上記の光硬化性樹脂として紫外線硬
化性ウレタンアクリレート樹脂，紫外線硬化性エポキシ
アクリレート樹脂，紫外線硬化性シリコンアクリレート
樹脂又は紫外線硬化性シリコン樹脂等を用い、照射する
光の特性波長域は紫外線フイルターにより定めて行なう
ことが特に好ましい。In the present invention, a UV curable urethane acrylate resin, a UV curable epoxy acrylate resin, a UV curable silicone acrylate resin, a UV curable silicone resin, or the like is used as the photocurable resin, and the characteristic wavelength range of the light to be irradiated is It is particularly preferable to perform the determination by using an ultraviolet filter.
従来の問題点を解決するための手段として、本発明は被
覆各層の光硬化性樹脂中に添加しておく反応開始剤をそ
の特性波長域が少しずつずれるように種類を選択し、添
加する。すなわち、本発明はｎ（ｎ≧２）層の被覆を形
成するにあたり、第ｋ（ｎ−１≧ｋ≧１）層を硬化させ
るために照射する光の特性波長が、その層より外側の層
つまりｋ＋１層以降を構成している樹脂中の反応開始剤
の特性波長域からずれるようにしておくことを特徴とす
る。なお、照射光の特性波長は、例えばランプと紫外線
フイルターの組合せ等により定めることができる。As a means for solving the conventional problems, in the present invention, the type of the reaction initiator to be added to the photocurable resin of each coating layer is selected and added so that the characteristic wavelength range is slightly shifted. That is, in the present invention, when forming a coating of n (n ≧ 2) layers, the characteristic wavelength of the light irradiated for curing the kth (n−1 ≧ k ≧ 1) layer is a layer outside the layer. That is, it is characterized in that it deviates from the characteristic wavelength range of the reaction initiator in the resin constituting the k + 1 layer and subsequent layers. The characteristic wavelength of the irradiation light can be determined by, for example, a combination of a lamp and an ultraviolet filter.
本発明に用いることのできる光硬化性樹脂としては、例
えば光硬化性シリコン樹脂・光硬化性ウレタンアクリレ
ート樹脂，光硬化性エポキシアクリレート樹脂，光硬化
性シリコンアクリレート樹脂，光硬化性ポリカーボネー
ト系アクリレート樹脂及び光硬化性ポリエステルアクリ
レート樹脂等が挙げられる。Examples of the photocurable resin that can be used in the present invention include photocurable silicone resin / photocurable urethane acrylate resin, photocurable epoxy acrylate resin, photocurable silicone acrylate resin, photocurable polycarbonate acrylate resin, and Examples thereof include photocurable polyester acrylate resin.
本発明に用いることのできる上記の光硬化性樹脂中に含
まれる反応開始剤としては、種々の公知の開示剤を用い
ることができる。例えばベンゾフエノン、チオキサンソ
ン、ベンゾインイソブチルエーテル、4,4−ビスジメチ
ルアミノベンゾフエノン、チバガイギー社製のイルガキ
ユア（商品名）184,同500,同651,同90、メルク社製のダ
ロキユア（商品名）1116,同1173,同953等が挙げられ
る。Various known disclosure agents can be used as the reaction initiator contained in the photocurable resin that can be used in the present invention. For example, benzophenone, thioxanthone, benzoin isobutyl ether, 4,4-bisdimethylaminobenzophenone, Ciba Geigy's Irgakiure (trade name) 184, 500, 651, 90, and Merck's Darochure (trade name) 1116. , 1173, 953, etc.
樹脂層被覆を形成する方法は特に限定されるところはな
く、公知の技術例えばダイスを用いて当該被覆樹脂（未
硬化）液を塗布した後に硬化ランプの照射光中を通過さ
せて硬化させる、或いはスプレーを用いて当該被覆樹脂
（未硬化）液をフアイバ表面に吹きつけた後硬化ランプ
を用いて硬化させる等の方法が挙げられる。The method for forming the resin layer coating is not particularly limited, and the coating resin (uncured) liquid is applied using a known technique such as a die and then passed through irradiation light of a curing lamp to be cured, or Examples include a method of spraying the coating resin (uncured) liquid on the fiber surface using a spray and then curing the liquid using a curing lamp.
照射光は反応開始剤の特性波長域に相当した波長のもの
を用いるが、紫外線ランプと紫外線フイルターを組合せ
る方法は、容易に相当波長の光を得ることができて便利
である。また、ランプ自体に特定の発光波長を有するも
のを用いても良い。照射光量は出力及び／又は照射時間
を調節することで制御できる。Irradiation light having a wavelength corresponding to the characteristic wavelength range of the reaction initiator is used, but the method of combining an ultraviolet lamp and an ultraviolet filter is convenient because light of a corresponding wavelength can be easily obtained. Alternatively, the lamp itself may have a specific emission wavelength. The irradiation light amount can be controlled by adjusting the output and / or the irradiation time.
なお、本発明において被覆を形成される光フアイバとし
ては、通常のガラス光フアイバ例えば石英ガラス系光フ
アイバ等が挙げられる。In addition, as the optical fiber with which the coating is formed in the present invention, an ordinary glass optical fiber, for example, a silica glass optical fiber or the like can be mentioned.
第１図は本発明を実施するための光フアイバ製造装置の
一具体例の構成を示す図で、光フアイバ母材１から線引
炉２を経て線引きされた光フアイバ３の外周に、１層目
被覆用の液状光硬化性樹脂４を１層目用コーテイングダ
イス５により塗布し、続いて１層目用硬化ランプ６で光
硬化性樹脂４の特性波長に合致する波長の光を照射して
硬化させて、１層目被覆を形成する。次に２層目被覆用
の液状光硬化性樹脂７を２層目用コーテイングダイス８
で塗布し、２層目用硬化ランプ９で照射して硬化させる
が、ランプ９の光はフイルター10を通すことにより２層
目用光硬化性樹脂７の特性波長に合致する光のみに照射
されるので、第１層目被覆用の光硬化性樹脂４はこのと
きの照射光によって何らの影響も受けない。以上のよう
にして２層の被覆を形成した後に該被覆フアイバを巻取
器11で巻取る。FIG. 1 is a diagram showing the configuration of a specific example of an optical fiber manufacturing apparatus for carrying out the present invention. One layer is provided on the outer periphery of an optical fiber 3 drawn from an optical fiber base material 1 through a drawing furnace 2. The liquid photocurable resin 4 for eye coating is applied by the coating die 5 for the first layer, and then the first layer curing lamp 6 is irradiated with light having a wavelength matching the characteristic wavelength of the photocurable resin 4. Cure to form the first layer coating. Next, the liquid photocurable resin 7 for coating the second layer is applied to the coating die 8 for the second layer.
Is applied and cured by being irradiated with the curing lamp 9 for the second layer, but the light of the lamp 9 is passed through the filter 10 so that only the light having the characteristic wavelength of the photocurable resin 7 for the second layer is irradiated. Therefore, the photocurable resin 4 for coating the first layer is not affected by the irradiation light at this time. After forming the two-layer coating as described above, the coating fiber is wound by the winder 11.
光硬化性樹脂の硬化は樹脂中に添加された反応開始剤か
らのラジカル生成によつて進行する。また、反応開始剤
からのラジカル生成は、その反応開始剤に特有の特定波
長域に含まれる波長の光が照射された場合に生じる。The curing of the photocurable resin proceeds by the generation of radicals from the reaction initiator added to the resin. Further, the radical generation from the reaction initiator occurs when the light having a wavelength included in a specific wavelength range peculiar to the reaction initiator is irradiated.
本発明は前記のように最外層のｎ層までの被覆の特性波
長が少しずつずれるように反応開始剤を選んであるの
で、例えばｋ＋１（ｎ≧ｋ＋１≧２）層の硬化にはこの
層に添加した反応開始剤の特性波長に相当してラジカル
を生成させる波長の光を照射するので、ｋ層までの特性
波長が異つている各層の樹脂中では最早ラジカルは生成
しない。従つて被覆各層の照射光量としては、夫々の層
を硬化させるために用いたランプ等の光源の照射光量の
みを考えればよいので、光量の把握・管理が容易に可能
である。又、光源とフイルタの組合せによつて、種々の
波長域の照射光を容易に得ることができる。In the present invention, as described above, the reaction initiator is selected so that the characteristic wavelengths of the coatings up to the outermost n layers are slightly shifted, and therefore, for curing of the k + 1 (n ≧ k + 1 ≧ 2) layer, this layer is used. Since the light having a wavelength for generating radicals corresponding to the characteristic wavelength of the added reaction initiator is irradiated, radicals are no longer generated in the resins of the respective layers having different characteristic wavelengths up to the k layer. Therefore, as the irradiation light amount of each coating layer, only the irradiation light amount of a light source such as a lamp used for curing each layer may be considered, so that the light amount can be easily grasped and managed. Further, by combining the light source and the filter, it is possible to easily obtain irradiation light of various wavelength ranges.
実施例１ 第１図に示す構成の製造装置を用いて、本発明により、
径125μｍの光フアイバを線引きし、１層目の被覆径が3
00μｍ、２層目被覆径が400μｍとなるように２層の光
硬化性樹脂被覆を形成した。このときの１層目被覆には
反応開始剤としてイルガキユア184（商品名、チバガイ
ギー社製）を２重量％添加した紫外線硬化製ウレタンア
クリレート樹脂を用い、２層目被覆には反応開始剤とし
てイルガキユア907（商品名、チバガイギー社製）を２
重量％添加した紫外線硬化性ウレタンアクリレート樹脂
を用いた。１層目硬化ランプ及び２層目硬化ランプはい
ずれもメタルハライドランプを使用し、２層目硬化ラン
プには市販の金属干渉フイルターを組合せて用いた。Example 1 Using the manufacturing apparatus having the configuration shown in FIG. 1, according to the present invention,
An optical fiber with a diameter of 125 μm is drawn, and the coating diameter of the first layer is 3
A second layer of photocurable resin coating was formed so that the second layer coating diameter would be 400 μm. At this time, a UV-curable urethane acrylate resin containing 2% by weight of Irgakiure 184 (trade name, manufactured by Ciba Geigy) as a reaction initiator was used for the first layer coating, and Irgakiure 907 was used as a reaction initiator for the second layer coating. 2 (product name, manufactured by Ciba Geigy)
A UV-curable urethane acrylate resin added by weight% was used. A metal halide lamp was used for both the first layer curing lamp and the second layer curing lamp, and a commercially available metal interference filter was used in combination for the second layer curing lamp.
反応開始剤のイルガキユア184とイルガキユア907の特性
波長域を、第２図の波長（nm）を横軸とし、吸光度（Ｔ
％）を縦軸とするグラフに、前者（184）を破線で後者
（907）を実線で示す。一方、メタルハライドランプの
特定波長域を、第３図の横軸波長λ（nm）に対する分光
エネルギー（相対エネルギー：％）を縦軸としたグラフ
に斜線域で示す。第４図には使用したフイルターの特定
波長域を示すが、さらにこれを第２図中にもフイルター
で透過される波長域として斜線域Ａで示した。第２図〜
第４図から明らかなように、本発明によれば、１層目の
硬化過程では第３図のエネルギー分布の光が照射される
ので、反応開始剤の特性波長域が380nmより短波長側に
あり、そのピークが330nm前後にある１層目の樹脂が硬
化される。次の２層目の硬化過程では、その反応開始剤
の特性波長域が350〜420nmの間にある２層の樹脂に対
し、第４図及び第３図のＡ領域に示す370±10nmの光の
みが照射されるので、２層の被覆樹脂は十分に硬化反応
が進むが、１層目の樹脂はこの照射では殆んど硬化反応
は進行せずにすむ。The characteristic wavelength ranges of the reaction initiators Irgakiure 184 and Irgakiure 907 are shown in FIG. 2 with the wavelength (nm) as the horizontal axis, and the absorbance (T
The former (184) is shown by the broken line and the latter (907) is shown by the solid line in the graph with the (%) as the vertical axis. On the other hand, the specific wavelength range of the metal halide lamp is shown by the shaded area in the graph of FIG. 3 in which the vertical axis is the spectral energy (relative energy:%) with respect to the wavelength λ (nm) on the horizontal axis. FIG. 4 shows the specific wavelength range of the filter used, and this is also shown in FIG. 2 by the shaded area A as the wavelength range transmitted by the filter. Fig. 2 ~
As is apparent from FIG. 4, according to the present invention, the light having the energy distribution shown in FIG. 3 is irradiated in the curing process of the first layer, so that the characteristic wavelength range of the reaction initiator is shorter than 380 nm. The resin of the first layer having a peak around 330 nm is cured. In the next curing process of the second layer, the light of 370 ± 10 nm shown in the area A of FIG. 4 and FIG. 3 is applied to the resin of the two layers whose characteristic wavelength range of the reaction initiator is between 350 and 420 nm. Since only the coating resin is irradiated, the curing reaction of the two-layer coating resin proceeds sufficiently, but the curing reaction of the resin of the first layer hardly progresses by this irradiation.
以上により得られた外径400μｍの２層被覆光フアイバ
（本発明品）の１層目樹脂のゲル分率を測定したとこ
ろ、89％であつた。The gel fraction of the first layer resin of the two-layer coated optical fiber (product of the present invention) having an outer diameter of 400 μm obtained above was measured and found to be 89%.
なお、ゲル分率は樹脂被覆の一部から試料をとり、この
重量（初期重量）を測定後、ソツクスレー抽出器を用い
て60℃のメチルエチルケトンで12時間抽出し、次に試料
を取り出して乾燥し、このとき乾燥後重量の初期重量に
対する割合を％で示したものである。The gel fraction is obtained by taking a sample from a part of the resin coating, measuring this weight (initial weight), extracting with methyl ethyl ketone at 60 ° C for 12 hours using a Soxhlet extractor, and then removing the sample and drying it. At this time, the ratio of the weight after drying to the initial weight is shown in%.
ゲル分率が高い程、抽出されない成分、すなわち硬化し
ている成分が多いことを意味するので、樹脂の硬化度が
高いと言える。 It can be said that the higher the gel fraction, the more components that are not extracted, that is, the components that are hardened, and that the degree of hardening of the resin is high.
比較例１ 光フアイバ線引きと第１層目被覆形成・硬化については
実施例１と全く同様にし、２層目樹脂の供給を止め、２
層目硬化ランプも消して、外径300μｍφの１層被覆の
みを有する光フアイバ（比較品１）を作成した。この１
層目被覆のゲル分率を測定したところ、実施例１と同じ
く89％であつた。Comparative Example 1 Optical fiber drawing and formation / curing of the first layer coating were performed in exactly the same manner as in Example 1, and the supply of the second layer resin was stopped.
The layer curing lamp was also turned off, and an optical fiber (comparative product 1) having an outer diameter of 300 μmφ and having only one layer coating was prepared. This one
When the gel fraction of the second layer coating was measured, it was 89% as in Example 1.
比較例２ 実施例１において２層目硬化ランプのフイルタを取りは
ずして行つた以外は同様にして２層被覆フアイバ（比較
品２）を作製した。ただし、２層目硬化用ランプの照射
光量については、フイルタをはずしたことで異つてくる
ので、実施例１と同じになるようにランプを減光させて
行つた。得られた比較品２の１層目比較のゲル分率は92
％であつた。Comparative Example 2 A two-layer coated fiber (Comparative Product 2) was prepared in the same manner as in Example 1 except that the filter of the second-layer curing lamp was removed. However, since the irradiation light amount of the second layer curing lamp differs depending on the fact that the filter is removed, the lamp was dimmed so as to be the same as in Example 1. The gel fraction of the first comparative layer of the obtained comparative product 2 was 92.
It was in%.
以上のように本発明品の一層目被覆樹脂は比較品１と同
じ89％のゲル分率であり、外層被覆時の光照射の影響は
全く受けていないのに対し、比較品２では92％のゲル分
率と３％アツプしている。このことは外層被覆の際の光
照射で第１層目がさらに硬化が進んだことを示してい
る。As described above, the first-layer coating resin of the product of the present invention has the same gel fraction of 89% as that of the comparative product 1 and is not affected by the light irradiation at the time of coating the outer layer at all, whereas the comparative product 2 has a gel fraction of 92%. The gel fraction is up to 3%. This indicates that the first layer was further cured by the light irradiation for coating the outer layer.
以上の実施例、比較例は簡単な２層被覆について示した
が、３層以上に多層被覆の場合も同様に各層毎に照射光
量を管理して作製できることは言うまでもない。Although the above examples and comparative examples show simple two-layer coating, it goes without saying that even in the case of multi-layer coating of three or more layers, the amount of irradiation light can be similarly controlled for each layer.
以上説明したように、本発明の光フアイバの製造方法
は、内層の樹脂の照射光量に全く影響を与えることな
く、外層の樹脂を被覆できるので、従来法よりはるかに
簡単かつ有効に、内層樹脂の照射光量を管理できる。従
つて、本発明は従来のように過量の光照射による水素発
生や劣化を防止することが可能となり、フアイバ寿命の
延期・伝送特性の保持・向上に非常に有効でしかも簡便
な産業上優れた発明である。As described above, the method for producing an optical fiber of the present invention can coat the resin of the outer layer without affecting the irradiation light amount of the resin of the inner layer at all, so that the inner layer resin is much simpler and more effective. It is possible to control the amount of irradiation light. Therefore, the present invention can prevent hydrogen generation and deterioration due to excessive light irradiation as in the past, is extremely effective in postponing the fiber life, maintaining and improving the transmission characteristics, and is simple and industrially excellent. It is an invention.
第１図は本発明の光フアイバの製造方法を実施する製造
装置の一例を示す概略図、第２図は反応開始剤イルガキ
ユア184とイルガキユア907の波長特性ならびに実施例１
で用いたフイルタで透過される波長域を示す図表、第３
図はメタルハライドランプの分光エネルギー分布を示す
図表、第４図は本発明の実施例１で用いたフイルタの波
長特性を示す図表である。FIG. 1 is a schematic view showing an example of a production apparatus for carrying out the optical fiber production method of the present invention, and FIG. 2 is a wavelength characteristic of the reaction initiators Irgakiure 184 and Irgakiure 907 and Example 1
Chart showing the wavelength range transmitted by the filter used in
FIG. 4 is a chart showing the spectral energy distribution of the metal halide lamp, and FIG. 4 is a chart showing the wavelength characteristics of the filter used in Example 1 of the present invention.
Claims (3)
アイバとし、該光フアイバの周囲に光硬化性樹脂をコー
テイングして硬化させることにより複数層の保護被覆を
有する光フアイバを製造する方法において、該保護被覆
層数をｎ（ｎ≧２）とすると内側から第ｋ番目（ｎ−１
≧ｋ≧１）の被覆層の樹脂中の反応開始剤の特性波長域
が、第（ｋ＋１）番目以降の被覆層の樹脂を硬化させる
ために照射する光の特性波長域からはずれるようにして
被覆を行なうことを特徴とする光フアイバの製造方法。1. An optical fiber having a plurality of protective coatings is manufactured by heating and melting and stretching an optical fiber base material to form an optical fiber, and coating a photo-curable resin around the optical fiber to cure the optical fiber. In the method, if the number of the protective coating layers is n (n ≧ 2), the k-th (n−1)
≧ k ≧ 1) coating so that the characteristic wavelength range of the reaction initiator in the resin of the coating layer deviates from the characteristic wavelength range of the light irradiated to cure the resin of the (k + 1) th and subsequent coating layers A method for manufacturing an optical fiber, which comprises:
アクリレート樹脂，紫外線硬化性エポキシアクリレート
樹脂，紫外線硬化性シリコンアクリレート樹脂又は紫外
線硬化性シリコン樹脂を用いて被覆を行なう特許請求の
範囲第１項に記載される光フアイバの製造方法。2. The method according to claim 1, wherein the photo-curable resin is a UV-curable urethane acrylate resin, a UV-curable epoxy acrylate resin, a UV-curable silicone acrylate resin or a UV-curable silicone resin. A method of manufacturing an optical fiber as described.
ーにより定めて行なう特許請求の範囲第１項に記載され
る光フアイバの製造方法。3. The method for producing an optical fiber according to claim 1, wherein the characteristic wavelength range of the light to be irradiated is determined by an ultraviolet filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62171238A JPH0776119B2 (en) | 1987-07-10 | 1987-07-10 | Optical fiber manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62171238A JPH0776119B2 (en) | 1987-07-10 | 1987-07-10 | Optical fiber manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6418948A JPS6418948A (en) | 1989-01-23 |
| JPH0776119B2 true JPH0776119B2 (en) | 1995-08-16 |
Family
ID=15919605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62171238A Expired - Lifetime JPH0776119B2 (en) | 1987-07-10 | 1987-07-10 | Optical fiber manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0776119B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5147433A (en) * | 1990-02-15 | 1992-09-15 | At&T Bell Laboratories | Methods of making coated optical fiber |
| CA2131078C (en) * | 1993-09-30 | 2002-04-16 | William James Baron | Method of curing dual-coated optical fiber |
| FR2765346B1 (en) * | 1997-06-26 | 1999-09-24 | Alsthom Cge Alcatel | METHOD FOR MANUFACTURING AN OPTICAL CONDUCTOR |
-
1987
- 1987-07-10 JP JP62171238A patent/JPH0776119B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6418948A (en) | 1989-01-23 |
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