JP2002214492A - Flame resistant coated optical fiber ribbon and manufacturing method therefor - Google Patents
Flame resistant coated optical fiber ribbon and manufacturing method thereforInfo
- Publication number
- JP2002214492A JP2002214492A JP2001013049A JP2001013049A JP2002214492A JP 2002214492 A JP2002214492 A JP 2002214492A JP 2001013049 A JP2001013049 A JP 2001013049A JP 2001013049 A JP2001013049 A JP 2001013049A JP 2002214492 A JP2002214492 A JP 2002214492A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- flame
- retardant
- coating
- resin
- 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.)
- Granted
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 101
- 238000004519 manufacturing process Methods 0.000 title claims description 19
- 239000011248 coating agent Substances 0.000 claims abstract description 92
- 238000000576 coating method Methods 0.000 claims abstract description 92
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 14
- 239000001301 oxygen Substances 0.000 claims abstract description 14
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 14
- 239000003063 flame retardant Substances 0.000 claims description 80
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 68
- 229920005989 resin Polymers 0.000 claims description 52
- 239000011347 resin Substances 0.000 claims description 52
- 239000011521 glass Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 229920013716 polyethylene resin Polymers 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 claims description 2
- 229910052736 halogen Inorganic materials 0.000 claims description 2
- 150000002367 halogens Chemical class 0.000 claims description 2
- 239000012796 inorganic flame retardant Substances 0.000 claims description 2
- -1 nitrogen-containing compound Chemical class 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 239000011574 phosphorus Substances 0.000 claims description 2
- 229920006122 polyamide resin Polymers 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 239000010410 layer Substances 0.000 description 21
- 238000000465 moulding Methods 0.000 description 5
- 239000000454 talc Substances 0.000 description 5
- 229910052623 talc Inorganic materials 0.000 description 5
- 239000011247 coating layer Substances 0.000 description 4
- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical compound OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 2
- 239000000347 magnesium hydroxide Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- KCTAWXVAICEBSD-UHFFFAOYSA-N prop-2-enoyloxy prop-2-eneperoxoate Chemical compound C=CC(=O)OOOC(=O)C=C KCTAWXVAICEBSD-UHFFFAOYSA-N 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 1
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、光通信などに使用
される光ファイバテープ心線に関し、特に難燃性を有す
る光ファイバテープ心線に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber ribbon used for optical communication and the like, and more particularly to an optical fiber ribbon having flame retardancy.
【０００２】[0002]
【従来の技術】近年の光ファイバ通信の発展と需要拡大
に伴い、局内、構内、その他の各種情報装置で光ファイ
バが多用され、配線スペースの省力化、配線の容易化か
ら多心光ファイバの使用が増加している。また、省スペ
ース化の点から光ファイバの細径化とともに、火災防止
の点から難燃化する要求されるようになってきている。2. Description of the Related Art With the development and demand expansion of optical fiber communication in recent years, optical fibers are frequently used in offices, premises, and various other information devices. Use is increasing. In addition, it has been required to reduce the diameter of the optical fiber in order to save space and to make it flame-retardant in order to prevent fire.
【０００３】多心光ファイバとしては、一般的には、光
ファイバテープ心線または抗張力体を縦添えした光ファ
イバテープコードが使用されている。光ファイバテープ
心線は、ガラス光ファイバの線引直後に一次被覆または
ニ次被覆により被覆された複数本の光ファイバ素線を、
一列に並べて一括被覆によりテープ化されている。ま
た、光ファイバテープコードは、光ファイバテープ心線
にアラミド繊維等の抗張力体を縦添えして外部被覆で一
体化して形成されている。[0003] As the multi-core optical fiber, an optical fiber tape cord or an optical fiber tape cord vertically attached with a tensile member is generally used. The optical fiber ribbon is a plurality of optical fibers coated with a primary coating or a secondary coating immediately after drawing a glass optical fiber.
They are arranged in a line and taped by batch coating. Further, the optical fiber tape cord is formed by vertically attaching a tensile strength member such as aramid fiber to the optical fiber ribbon and integrally forming the cord with an external coating.
【０００４】光ファイバ素線の被覆は、紫外線硬化型の
ウレタンアクリレート等の樹脂が用いられ、一括被覆も
同じく紫外線硬化型のウレタンアクリレート系、エポキ
シアクリレート系樹脂が用いられている。これらの、紫
外線硬化型のアクリレート系樹脂は、燃えやすい性質を
有している。したがって、火災発生の場合は火災延焼を
拡大する一因ともなっている。A resin such as an ultraviolet-curable urethane acrylate is used for coating the optical fiber, and an ultraviolet-curable urethane acrylate or epoxy acrylate resin is used for the batch coating. These ultraviolet-curable acrylate-based resins have a flammable property. Therefore, in the event of a fire, it also contributes to the spread of fire spread.
【０００５】従来、難燃性の光ファイバとして、光ファ
イバテープ心線に抗張力体を縦添えした光ファイバテー
プコードが知られている（特開平１１−７２６６９号公
報参照）。この従来技術では、光ファイバテープ心線の
外側を覆う外部被覆を難燃性の樹脂で形成するというも
のである。しかし、情報機器や光ファイバケーブルで使
用される光ファイバは、細径化のため光ファイバテープ
心線の形で用いられることが多い。光ファイバテープ心
線に光ファイバテープコードのように難燃化した外部被
覆を設けると、心線断面積が大幅に増加するので、この
ため、光ファイバテープ心線自体での難燃化が望まれて
いる。Conventionally, as a flame-retardant optical fiber, there has been known an optical fiber tape cord in which a tensile strength member is vertically attached to an optical fiber tape core wire (see Japanese Patent Application Laid-Open No. 11-72669). In this conventional technique, an outer coating that covers the outside of the optical fiber ribbon is formed of a flame-retardant resin. However, optical fibers used in information equipment and optical fiber cables are often used in the form of optical fiber ribbons for reducing the diameter. If the flame-retardant outer coating is provided on the optical fiber tape like an optical fiber tape cord, the cross-sectional area of the fiber will increase significantly. It is rare.
【０００６】また、電線等の分野では、その絶縁被覆に
難燃剤を添加した絶縁樹脂を用いて難燃絶縁電線とする
ことが知られている。しかし、光ファイバの分野では、
被覆樹脂の密着性や物理特性により伝送損失が大きく影
響するため、単に被覆樹脂に難燃剤を添加すると光伝送
特性等を損なうことがある。In the field of electric wires and the like, it is known that a flame-retardant insulated wire is formed by using an insulating resin in which a flame retardant is added to the insulating coating. However, in the field of optical fiber,
Since the transmission loss is greatly affected by the adhesion and physical characteristics of the coating resin, simply adding a flame retardant to the coating resin may impair the optical transmission characteristics and the like.
【０００７】[0007]
【発明が解決しようとする課題】本発明は、上述した事
情に鑑みてなされたもので、光ファイバテープ心線の外
形寸法を増加させることなく、また、伝送特性等を損な
うことなく、光ファイバテープ心線の難燃化を図ること
を課題とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been made without increasing the outer dimensions of the optical fiber ribbon and without impairing the transmission characteristics and the like. It is an object of the present invention to make the tape core flame-retardant.
【０００８】[0008]
【課題を解決するための手段】本発明の難燃性光ファイ
バテープ心線は、複数本の光ファイバ素線を平行に配列
して、一括被覆によりテープ化される光ファイバテープ
心線であって、一括被覆が酸素指数２５以上の難燃性の
熱可塑性樹脂により形成されていることを特徴とする。
また、本発明の他の難燃性光ファイバテープ心線は、一
括被覆が２層で形成され、１層目被覆が紫外線硬化型樹
脂で形成され、２層目被覆が酸素指数２５以上の難燃性
の熱可塑性樹脂により形成されていることを特徴とす
る。The flame-retardant optical fiber ribbon according to the present invention is an optical fiber ribbon obtained by arranging a plurality of optical fibers in parallel and forming a tape by collective coating. The batch coating is formed of a flame-retardant thermoplastic resin having an oxygen index of 25 or more.
Further, in another flame-retardant optical fiber ribbon of the present invention, the batch coating is formed of two layers, the first coating is formed of an ultraviolet-curable resin, and the second coating is formed of a hard coating having an oxygen index of 25 or more. It is characterized by being formed of a flammable thermoplastic resin.
【０００９】本発明の難燃性光ファイバテープ心線の製
造方法は、複数本の光ファイバ素線を平行に配列して、
一括被覆によりテープ化される光ファイバテープ心線の
製造方法であって、光ファイバ素線を予熱した後に、酸
素指数２５以上の難燃性の熱可塑性樹脂によりタイト構
造で一括被覆することを特徴とする。また、本発明の他
の難燃性光ファイバテープ心線の製造方法は、２層の一
括被覆によりテープ化される光ファイバテープ心線の製
造方法であって、一括被覆の１層目被覆を紫外線硬化型
の樹脂で形成した後、引続き２層目被覆を酸素指数２５
以上の難燃性の熱可塑性樹脂によりタイト構造で形成す
ることを特徴とする。In the method for manufacturing a flame-retardant optical fiber ribbon according to the present invention, a plurality of optical fibers are arranged in parallel,
A method of manufacturing an optical fiber ribbon which is taped by collective coating, wherein the optical fiber is preliminarily heated and then collectively coated with a flame-retardant thermoplastic resin having an oxygen index of 25 or more in a tight structure. And Another method for manufacturing a flame-retardant optical fiber ribbon according to the present invention is a method for manufacturing an optical fiber ribbon which is taped by two-layer coating, wherein the first-layer coating of the batch coating is performed. After being formed with a UV-curable resin, the second layer coating was continuously applied with an oxygen index of 25.
It is characterized by being formed in a tight structure by the above flame-retardant thermoplastic resin.
【００１０】[0010]
【発明の実施の形態】本発明の実施の形態を図により説
明する。図１は本発明の第１の実施の形態を示し、図
中、１０は光ファイバテープ心線、１１は光ファイバ素
線、１２は一括被覆を示す。光ファイバ素線１１は、公
称外径１２５μｍのガラス光ファイバ１１ａを紫外線硬
化型樹脂による一次被覆層１１ｂと、着色剤を添加した
紫外線硬化型樹脂による二次被覆層１１ｃで被覆し、被
覆外径ｄが０．２５ｍｍ程度になるように形成されたも
のである。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment of the present invention, in which 10 is an optical fiber ribbon, 11 is an optical fiber, and 12 is a blanket coating. The optical fiber 11 is formed by coating a glass optical fiber 11a having a nominal outer diameter of 125 μm with a primary coating layer 11b made of an ultraviolet-curable resin and a secondary coating layer 11c made of an ultraviolet-curable resin to which a coloring agent is added. It is formed so that d is about 0.25 mm.
【００１１】光ファイバテープ心線１０は、光ファイバ
素線１１を複数本密着状態で平行に一列に並べ、一括被
覆１２により被覆してテープ化したもので、心線厚みｔ
を例えば、０．３１ｍｍ程度、４心の光ファイバで心線
幅ｗを例えば、１．１ｍｍ程度になるように形成したも
のである。一括被覆１２は、従来は紫外線硬化型の樹脂
で形成しているが、本発明では難燃性の熱可塑性樹脂ま
たは難燃剤を添加した熱可塑性樹脂で形成する。The optical fiber ribbon 10 is formed by arranging a plurality of optical fiber wires 11 in parallel in a line in close contact with each other, covering them with a collective coating 12, and forming a tape.
Is formed with, for example, about 0.31 mm and a four-core optical fiber so that the core wire width w becomes about 1.1 mm, for example. The batch coating 12 is conventionally formed of a UV-curable resin, but in the present invention, is formed of a flame-retardant thermoplastic resin or a thermoplastic resin to which a flame retardant is added.
【００１２】図２は第２の実施の形態を示し、図１の一
括被覆１２を２層で形成したものである。この実施の形
態では、光ファイバ素線１１は、図１と同様のものが用
いられる。この一括被覆の１層目被覆１２ａは、２層目
被覆１２ｂの形成に際して、偏肉の発生抑制と成型を容
易にすることを可能とするものである。１層目被覆１２
ａは、従来と同様に非難燃性の紫外線硬化型樹脂で形成
し、２層目被覆１２ｂを難燃性の熱可塑性樹脂または難
燃剤を添加した熱可塑性樹脂で形成する。この図２で
は、図１の実施の形態と比べて、多少厚みは増加する
が、紫外線硬化型樹脂による１層目被膜１２ａを薄く形
成し、心線厚みｔおよび心線幅ｗを、図１と同程度にな
るように形成することも可能である。FIG. 2 shows a second embodiment, in which the collective coating 12 of FIG. 1 is formed in two layers. In this embodiment, the same optical fiber 11 as that of FIG. 1 is used. The first-layer coating 12a of the batch coating makes it possible to suppress the occurrence of uneven thickness and to facilitate molding when forming the second-layer coating 12b. First layer coating 12
a is formed of a non-flame-retardant ultraviolet curable resin as in the conventional case, and the second layer coating 12b is formed of a flame-retardant thermoplastic resin or a thermoplastic resin to which a flame retardant is added. In FIG. 2, although the thickness is slightly increased as compared with the embodiment of FIG. 1, the first-layer coating 12a made of the ultraviolet-curable resin is formed to be thin, and the core thickness t and the core width w are reduced. It is also possible to form them so as to be approximately the same as the above.
【００１３】図３は第３の実施の形態を示し、図２の一
括被覆１２の１層目被覆１２ａを隣接する光ファイバ素
線間の間隙のみを埋める程度に、テープ化される厚み面
ですり切り状態で形成したものである。１層目被覆１２
ａをすり切り形状とすることで、心線厚みを従来と同程
度とすることができ、または、２層目被覆１２ｂは、１
層目被覆の厚み分だけ厚くした難燃性樹脂で形成するこ
とができ、難燃性をより高めることができる。FIG. 3 shows a third embodiment, in which the first layer coating 12a of the collective coating 12 of FIG. 2 is taped to such an extent that it fills only the gap between adjacent optical fiber strands. It was formed in a worn state. First layer coating 12
By forming a into a cut-out shape, the thickness of the core wire can be made approximately the same as that of the related art, or
It can be formed of a flame-retardant resin thickened by the thickness of the layer coating, and the flame retardancy can be further enhanced.
【００１４】一括被覆１２は、ベース樹脂自体が既に難
燃性を備えているもの、または難燃剤の添加により難燃
性とするもの、あるいは難燃性のベース樹脂にさらに難
燃剤を添加して難燃性を高めた樹脂が用いられる。具体
的には、ベース樹脂として、ポリエチレン樹脂、ポリア
ミド樹脂、フッ素樹脂、塩化ビニル樹脂等の熱可塑性樹
脂や熱可塑性エラストマー樹脂を用いることができる。
これに添加される難燃剤としては、ハロゲン系難燃剤、
水酸化アルミニウムや水酸化マグネシウムの水和系難燃
剤、リン系難燃剤、シリコーン系難燃剤、窒素含有化合
物難燃剤、その他無機系難燃剤がある。The collective coating 12 has a base resin itself having flame retardancy, or is made flame retardant by adding a flame retardant, or a flame retardant is added to a flame retardant base resin. A resin with increased flame retardancy is used. Specifically, a thermoplastic resin such as a polyethylene resin, a polyamide resin, a fluororesin, a vinyl chloride resin, or a thermoplastic elastomer resin can be used as the base resin.
Halogen-based flame retardants,
Hydrated flame retardants of aluminum hydroxide and magnesium hydroxide, phosphorus-based flame retardants, silicone-based flame retardants, nitrogen-containing compound flame retardants, and other inorganic flame retardants.
【００１５】これらの熱可塑性のベース樹脂に難燃剤を
添加して、図１〜図３に示すような一括被覆１２を形成
すると、製造後に被覆の収縮と、被覆成形時の偏肉によ
りガラス光ファイバに蛇行が生じる場合がある。これを
防止するには、難燃性一括被覆の弾性率が以下の条件を
満たす必要がある。When a flame retardant is added to these thermoplastic base resins to form the collective coating 12 as shown in FIGS. 1 to 3, the shrinkage of the coating after production and the uneven thickness at the time of coating molding cause glass light emission. The fiber may meander. To prevent this, the elastic modulus of the flame-retardant batch coating must satisfy the following conditions.
【００１６】ε＝［Ｅ2 Ｓ2 ／（Ｅ1 Ｓ1 ＋Ｅ
2 Ｓ2 ）］×ε2 ＜０．３ 但し、 Ｅ1 ：ガラス光ファイバの弾性率 Ｅ2 ：難燃性一括被覆の弾性率 Ｓ1 ：ガラス光ファイバの総断面積 Ｓ2 ：難燃性一括被覆の総断面積 ε2 ：難燃性一括被覆の内部残留歪 ε：ガラス光ファイバに加わる歪Ε = [E 2 S 2 / (E 1 S 1 + E)
2 S 2 )] × ε 2 <0.3, where E 1 : elastic modulus of glass optical fiber E 2 : elastic modulus of flame-retardant bulk coating S 1 : total cross-sectional area of glass optical fiber S 2 : flame retardant Total cross-sectional area of bulk coating ε 2 : Internal residual strain of flame-retardant bulk coating ε: Strain applied to glass optical fiber
【００１７】ここで、弾性率Ｅ1およびＥ2は、常温（２
３℃）における弾性率とする。また、難燃性一括被覆は
厳密には弾性体でないため正確ではないが、弾性率Ｅ2
は、図４に示す難燃性一括被覆のＳ−Ｓ曲線（Ｓｔｒｅ
ｓｓ−Ｓｔｒａｉｎ）による伸び０．１％での値とす
る。[0017] Here, the elastic modulus E 1 and E 2, room temperature (2
(3 ° C.). Also, the flame-retardant batch coating is not strictly an elastic body and thus is not accurate, but the elastic modulus E 2
Is the SS curve (Stre of the flame-retardant batch coating shown in FIG. 4).
(ss-Strain) at an elongation of 0.1%.
【００１８】次に、本発明による難燃性光ファイバテー
プ心線の製造方法を図５により説明する。図５（Ａ）
は、図１の光ファイバテープ心線の製造方法の例を示
し、図５（Ｂ）は、図２および図３の光ファイバテープ
心線の製造方法の例を示す。図中、１０は光ファイバテ
ープ心線、１１は光ファイバ素線、２１は光ファイバ素
線供給リール、２２は集線装置、２３はタルク塗布装
置、２４はヒータ、２５は難燃性樹脂被覆用クロスヘッ
ド、２６はキャプスタン、２７は巻取りリール、２８は
紫外線硬化型樹脂被覆用クロスヘッド、２９は紫外線照
射装置を示す。Next, a method for manufacturing a flame-retardant optical fiber ribbon according to the present invention will be described with reference to FIG. FIG. 5 (A)
Shows an example of a method of manufacturing the optical fiber ribbon of FIG. 1, and FIG. 5B shows an example of a method of manufacturing the optical fiber ribbon of FIGS. 2 and 3. In the drawing, 10 is an optical fiber tape core, 11 is an optical fiber strand, 21 is an optical fiber strand supply reel, 22 is a concentrator, 23 is a talc coating device, 24 is a heater, and 25 is a flame-retardant resin coating. A cross head, 26 is a capstan, 27 is a take-up reel, 28 is a cross head for coating with an ultraviolet curable resin, and 29 is an ultraviolet irradiation device.
【００１９】図５（Ａ）は、複数本の光ファイバ素線１
１を難燃性樹脂で直接一括被覆する製造方法の例であ
る。先ず、複数本の光ファイバ素線１１がそれぞれ供給
リール２１から繰出され、集線装置２２で一列に密着す
るようにして整列される。次いで必要に応じて難燃性樹
脂との適度な密着を得るためにタルク塗布装置２３でタ
ルクを塗布する。この後、ヒータ２４で光ファイバ素線
１１を予熱して被覆表面を滑らかにしておく。これによ
り、一括被覆樹脂との密着性がよくなり、製造後の伝送
損失増を抑制することができる。FIG. 5A shows a plurality of optical fiber wires 1.
1 is an example of a production method in which a coating material No. 1 is directly covered with a flame retardant resin. First, a plurality of optical fiber wires 11 are respectively drawn out from a supply reel 21 and aligned by a concentrator 22 so as to be in close contact with one line. Next, talc is applied by a talc application device 23 as needed in order to obtain appropriate adhesion to the flame-retardant resin. Thereafter, the optical fiber 11 is preheated by the heater 24 to smooth the coating surface. Thereby, the adhesiveness with the collective coating resin is improved, and an increase in transmission loss after manufacturing can be suppressed.
【００２０】続いて、難燃性樹脂が供給されるクロスヘ
ッド２５でにより、一括被覆を所定の形状と寸法で成形
し、光ファイバテープ心線１０とする。一括被覆は、冷
却（図示せず）されて硬化された後、キャプスタン２６
を経て巻取りリール２７により巻取り収納される。な
お、光ファイバ素線１１には、難燃性樹脂の硬化後の収
縮を考慮して、＋０．３％程度の引張り歪を与えておく
ことにより、製造後の圧縮歪の発生を小さく抑えること
ができる。Subsequently, the blanket coating is formed into a predetermined shape and size by the crosshead 25 to which the flame-retardant resin is supplied, and the optical fiber ribbon 10 is obtained. The bulk coating is cooled (not shown) and cured, after which the capstan 26
Is wound up and stored by the winding reel 27. The tensile strain of about + 0.3% is given to the optical fiber 11 in consideration of the shrinkage of the flame-retardant resin after curing, so that the generation of the compressive strain after the production is suppressed. Can be.
【００２１】図５（Ｂ）は、複数本の光ファイバ素線を
予め紫外線硬化型樹脂による薄い１層目の一括被覆で、
光ファイバ素線１１を整列一体化した後に、難燃性樹脂
で１層目より厚く一括被覆する製造方法の一例である。
光ファイバ素線１１を予め整列一体化しておくことによ
り、２層目の一括被覆成型が容易となる。先ず、光ファ
イバ素線１１を集線装置２２で一列に密着するようにし
て整列させることは、図５（Ａ）と同じである。この
後、紫外線硬化型樹脂が供給されるクロスヘッド２８で
１層目の一括被覆を成形し、紫外線照射装置２９により
ある程度硬化させてテープ化する。FIG. 5 (B) shows a plurality of optical fiber strands previously coated with a thin first layer of ultraviolet curable resin.
This is an example of a manufacturing method in which after the optical fiber strands 11 are aligned and integrated, they are collectively covered with a flame-retardant resin so as to be thicker than the first layer.
By aligning and integrating the optical fiber strands 11 in advance, the second layer collective coating molding becomes easy. First, the arrangement of the optical fiber strands 11 in close contact with the concentrator 22 in a line is the same as in FIG. 5A. Thereafter, the first-layer batch coating is formed by the crosshead 28 to which the ultraviolet-curable resin is supplied, and is cured to some extent by the ultraviolet irradiation device 29 to form a tape.
【００２２】この後、引続いて難燃性樹脂が供給される
クロスヘッド２５により、２層目の一括被覆を図５
（Ａ）の場合と同様に所定の形状と寸法で成形して、光
ファイバテープ心線１０とする。一括被覆は、冷却（図
示せず）されて硬化された後、キャプスタン２６を経て
巻取りリール２７により巻取り収納される。なお、２層
目の一括被覆の成形は、１層目の一括被覆の表面温度が
高い状態で行なわれるので、この場合、図５（Ａ）で行
なったタルク塗布やヒータによる加熱は不要となる。ま
た、光ファイバ素線１１に、引張り歪を与えておくこと
は、同様である。After that, the second batch coating is performed by the crosshead 25 to which the flame-retardant resin is continuously supplied as shown in FIG.
The optical fiber ribbon 10 is formed into a predetermined shape and size in the same manner as in the case of FIG. The batch coating is cooled (not shown) and cured, and then wound up and stored by a winding reel 27 via a capstan 26. In addition, since the forming of the second batch coating is performed in a state where the surface temperature of the first batch coating is high, in this case, the talc coating and the heating by the heater performed in FIG. 5A are unnecessary. . The same applies to applying tensile strain to the optical fiber 11.
【００２３】図６は、本発明で使用する被覆整形用のク
ロスヘッドの例を示す。クロスヘッドでの被覆形態には
ルース構造とタイト構造があるが、１層目および２層目
ともタイト構造で被覆成形するのが望ましい。このた
め、図５のクロスヘッド２５および２８には、図６よう
にニップル３１の先端がダイ３０の端部より内側に位置
した形状のものを用いる。また、図３の１層目の被覆
は、ダイ３０の開口部を高精度で形成したものを用い
る。なお、図２および図３の２層目は、ルース構造で形
成してもよいが、難燃性樹脂の成型歪みを低減するに
は、タイト構造の方が望ましい。FIG. 6 shows an example of a crosshead for coating and shaping used in the present invention. There are a loose structure and a tight structure in the form of coating with the crosshead, but it is desirable that both the first layer and the second layer are formed with a tight structure. For this reason, the crossheads 25 and 28 in FIG. 5 have a shape in which the tip of the nipple 31 is located inside the end of the die 30 as shown in FIG. In addition, the coating of the first layer shown in FIG. 3 uses an opening of the die 30 formed with high precision. The second layer in FIGS. 2 and 3 may be formed in a loose structure, but a tight structure is more preferable in order to reduce molding distortion of the flame-retardant resin.
【００２４】次に、本発明の具体例について説明する。
光ファイバテープ心線の一括被覆は、図１の形態で形成
した。光ファイバ素線１１には、紫外線硬化型のウレタ
ンアクリレート樹脂の被覆表面を着色樹脂で被覆し、被
覆外径ｄがほぼ０．２５ｍｍのものを用いた。一括被覆
には、ポリエチレン樹脂をベース樹脂として、これに難
燃剤として水酸化マグネシウムを添加した難燃性樹脂を
使用した。一括被覆成型後の光ファイバテープ心線厚さ
ｔを０．３１ｍｍ、テープ幅ｗを１．１ｍｍとした。Next, a specific example of the present invention will be described.
The collective coating of the optical fiber ribbon was formed in the form shown in FIG. The optical fiber 11 used was one whose ultraviolet-curable urethane acrylate resin-coated surface was coated with a colored resin and whose coating outer diameter d was approximately 0.25 mm. For the batch coating, a flame-retardant resin in which polyethylene resin was used as a base resin and magnesium hydroxide was added as a flame retardant to the resin was used. The optical fiber tape core thickness t after the batch coating and molding was 0.31 mm, and the tape width w was 1.1 mm.
【００２５】上述の具体例における難燃性樹脂として、
残留伸び率が１２０％で、酸素指数（ＯＩ）値が２０〜
３０（ベース樹脂と難燃剤の混合比率により調整）のも
のを用意し、この難燃性樹脂で一括被覆した光ファイバ
テープ心線の難燃性を評価した。なお、酸素指数とは、
材料が自然燃焼するときの酸素濃度で、例えば、ＯＩ３
０とは酸素濃度３０％（残り約７０％が窒素）をいう。
評価は、ＪＩＳ３００５の水平試験による自己消火性で
行ない、この結果を、次の表１示す。As the flame-retardant resin in the above specific example,
The residual elongation is 120% and the oxygen index (OI) value is 20 to
30 (adjusted by the mixing ratio of the base resin and the flame retardant) were prepared, and the flame retardancy of the optical fiber ribbon coated with the flame retardant resin was evaluated. The oxygen index is
The oxygen concentration at which the material spontaneously burns, for example, OI3
Zero means an oxygen concentration of 30% (the remaining 70% is nitrogen).
The evaluation was carried out by self-extinguishing by a horizontal test of JIS3005, and the results are shown in Table 1 below.
【００２６】[0026]
【表１】 この結果から、十分な難燃性を得るには、酸素指数値が
２５以上であるといえる。[Table 1] From this result, it can be said that the oxygen index value is 25 or more in order to obtain sufficient flame retardancy.
【００２７】また、上述の具体例における難燃性樹脂と
して、酸素指数が３０で、残留伸び率が６０〜１２０％
のものを用意し、この難燃性樹脂で一括被覆した光ファ
イバテープ心線の機械的強度を評価した。評価は、振動
試験後の一括被覆の割れ発生の有無で行ない、この結果
を、次の表２に示す。なお、振動試験は、振動数２０Ｈ
ｚ、振幅±５ｍｍ、固定間隔１ｍ、振動回数１００万回
とした。The flame-retardant resin in the above embodiment has an oxygen index of 30 and a residual elongation of 60 to 120%.
Was prepared, and the mechanical strength of the optical fiber ribbon coated with the flame-retardant resin was evaluated. The evaluation was made based on whether or not cracks occurred in the batch coating after the vibration test. The results are shown in Table 2 below. The vibration test was performed at a frequency of 20H.
z, amplitude ± 5 mm, fixed interval 1 m, number of vibration 1 million times.
【００２８】[0028]
【表２】 この結果から、十分な機械的強度を確保するには、残留
伸び率が１００％以上必要であるといえる。[Table 2] From this result, it can be said that the residual elongation percentage is required to be 100% or more in order to secure sufficient mechanical strength.
【００２９】[0029]
【発明の効果】以上の説明から明らかなように、本発明
によれば、断面の形状、寸法の増加を抑制し細径化して
光ファイバテープ心線自体の難燃化を図ることができ、
また、一括被覆に難燃性樹脂を用いても、機械的強度を
損なわず、歪みの発生を抑制することができる。As is apparent from the above description, according to the present invention, it is possible to suppress the increase in the cross-sectional shape and dimensions and to reduce the diameter to make the optical fiber ribbon itself flame-retardant.
Further, even if a flame-retardant resin is used for the batch coating, the occurrence of distortion can be suppressed without impairing the mechanical strength.
【図１】本発明の第１の実施の形態を示す光ファイバテ
ープ心線の断面図である。FIG. 1 is a cross-sectional view of an optical fiber ribbon showing a first embodiment of the present invention.
【図２】本発明の第２の実施の形態を示す光ファイバテ
ープ心線の断面図である。FIG. 2 is a sectional view of an optical fiber ribbon showing a second embodiment of the present invention.
【図３】本発明の第３の実施の形態を示す光ファイバテ
ープ心線の断面図である。FIG. 3 is a cross-sectional view of an optical fiber ribbon showing a third embodiment of the present invention.
【図４】難燃性樹脂のＳ−Ｓ曲線から弾性率を求めるこ
とを示す図である。FIG. 4 is a diagram showing that an elastic modulus is determined from an SS curve of a flame-retardant resin.
【図５】本発明の光ファイバテープ心線の製造方法を説
明する図である。FIG. 5 is a diagram illustrating a method of manufacturing an optical fiber ribbon according to the present invention.
【図６】本発明の製造方法で使用するクロスヘッドの概
略を示す図である。FIG. 6 is a view schematically showing a crosshead used in the manufacturing method of the present invention.
１０…光ファイバテープ心線、１１…光ファイバ素線、
１１ａ…ガラス光ファイバ、１１ｂ…一次被覆層、１１
ｃ…二次被覆層、１２…一括被覆、１２ａ…１層目被
覆、１２ｂ…２層目被覆、２１…光ファイバ素線供給リ
ール、２２…集線装置、２３…タルク塗布装置、２４…
ヒータ、２５…難燃性樹脂被覆用クロスヘッド、２６…
キャプスタン、２７…巻取りリール、２８…紫外線硬化
型樹脂被覆用クロスヘッド、２９…紫外線照射装置。10: optical fiber tape, 11: optical fiber,
11a: glass optical fiber, 11b: primary coating layer, 11
c: secondary coating layer, 12: collective coating, 12a: first coating, 12b: second coating, 21: optical fiber wire supply reel, 22: concentrator, 23: talc coating device, 24 ...
Heater, 25 ... Cross head for flame-retardant resin coating, 26 ...
Capstan, 27: take-up reel, 28: UV-curable resin coating crosshead, 29: UV irradiation device.
Claims (8)
て、一括被覆によりテープ化される光ファイバテープ心
線であって、前記一括被覆が酸素指数２５以上の難燃性
の熱可塑性樹脂により形成されていることを特徴とする
難燃性光ファイバテープ心線。1. An optical fiber ribbon, wherein a plurality of optical fiber strands are arranged in parallel and taped by collective coating, wherein the collective coating has an oxygen index of 25 or more. A flame-retardant optical fiber ribbon, which is made of resin.
１層目被覆が紫外線硬化型の樹脂で形成され、２層目被
覆が前記難燃性の熱可塑性樹脂で形成されていることを
特徴とする請求項１に記載の難燃性光ファイバテープ心
線。2. The method according to claim 1, wherein the blanket coating is formed of two layers.
The flame-retardant optical fiber tape core according to claim 1, wherein the first-layer coating is formed of an ultraviolet-curable resin, and the second-layer coating is formed of the flame-retardant thermoplastic resin. line.
イバ素線間の間隙のみを埋めるようにテープ化される厚
み面ですり切り状態で形成されていることを特徴とする
請求項２に記載の難燃性光ファイバテープ心線。3. The method according to claim 2, wherein the first-layer coating is formed in a cut-off state on a thick surface taped so as to fill only a gap between the plurality of optical fiber strands. 3. The flame-retardant optical fiber tape according to 1.
は、ポリエチレン樹脂、ポリアミド樹脂、フッ素樹脂、
塩化ビニル樹脂のいずれかから選択され、前記ベース樹
脂に添加される難燃剤は、ハロゲン系難燃剤、水和系難
燃剤、リン系難燃剤、シリコーン系難燃剤、窒素含有化
合物難燃剤、無機系難燃剤のいずれかから選択されてい
ることを特徴とする請求項１〜３のいずれか１項に記載
の難燃性光ファイバテープ心線。4. The base resin of the flame-retardant thermoplastic resin is a polyethylene resin, a polyamide resin, a fluororesin,
Flame retardants selected from vinyl chloride resins and added to the base resin include halogen-based flame retardants, hydrated flame retardants, phosphorus-based flame retardants, silicone-based flame retardants, nitrogen-containing compound flame retardants, and inorganic flame retardants. The flame-retardant optical fiber ribbon according to any one of claims 1 to 3, which is selected from any of flame retardants.
の弾性率をＥ1 、ガラス光ファイバの総断面積Ｓ1 、難
燃性一括被覆の弾性率Ｅ2 、難燃性一括被覆の総断面積
をＳ2 、難燃性一括被覆の内部残留歪ε2 、としたと
き、 ［Ｅ2 Ｓ2 ／（Ｅ1 Ｓ1 ＋Ｅ2 Ｓ2 ）］×ε2 ＜０．３ の条件を満たすことを特徴とする請求項１〜４のいずれ
か１項に記載の難燃性光ファイバテープ心線。5. The elastic modulus of the glass optical fiber of the optical fiber ribbon is E 1 , the total cross-sectional area S 1 of the glass optical fiber, the elastic modulus E 2 of the flame-retardant collective coating, and the total cutoff of the flame-retardant collective coating. Assuming that the area is S 2 and the internal residual strain ε 2 of the flame-retardant batch coating, the condition of [E 2 S 2 / (E 1 S 1 + E 2 S 2 )] × ε 2 <0.3 is satisfied. The flame-retardant optical fiber ribbon according to any one of claims 1 to 4, characterized in that:
０％以上であることを特徴とする請求項５に記載の難燃
性光ファイバテープ心線。6. The residual elongation percentage of the flame-retardant collective coating is 10%.
The flame-retardant optical fiber ribbon according to claim 5, wherein the content is 0% or more.
て、一括被覆によりテープ化される光ファイバテープ心
線の製造方法であって、前記光ファイバ素線を予熱した
後に、酸素指数２５以上の難燃性の熱可塑性樹脂により
タイト構造で一括被覆することを特徴とする難燃性光フ
ァイバテープ心線の製造方法。7. A method for manufacturing an optical fiber ribbon, wherein a plurality of optical fibers are arranged in parallel and taped by batch coating, wherein the oxygen index is measured after preheating the optical fibers. A method for producing a flame-retardant optical fiber tape, wherein the core is coated in a tight structure with at least 25 flame-retardant thermoplastic resin.
て、２層の一括被覆によりテープ化される光ファイバテ
ープ心線の製造方法であって、前記一括被覆の１層目被
覆を紫外線硬化型の樹脂で形成した後、引続き２層目被
覆を酸素指数２５以上の難燃性の熱可塑性樹脂によりタ
イト構造で一括被覆を形成することを特徴とする難燃性
光ファイバテープ心線の製造方法。8. A method for manufacturing an optical fiber ribbon, wherein a plurality of optical fiber strands are arranged in parallel to form a tape by two layers of collective coating. A flame-retardant optical fiber ribbon, characterized in that, after being formed of a UV-curable resin, the second layer coating is subsequently formed in a tight structure with a flame-retardant thermoplastic resin having an oxygen index of 25 or more in a tight structure. Manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001013049A JP4715981B2 (en) | 2001-01-22 | 2001-01-22 | Flame retardant optical fiber ribbon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001013049A JP4715981B2 (en) | 2001-01-22 | 2001-01-22 | Flame retardant optical fiber ribbon |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002214492A true JP2002214492A (en) | 2002-07-31 |
| JP4715981B2 JP4715981B2 (en) | 2011-07-06 |
Family
ID=18879970
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001013049A Expired - Lifetime JP4715981B2 (en) | 2001-01-22 | 2001-01-22 | Flame retardant optical fiber ribbon |
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| Country | Link |
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| WO2004074898A1 (en) * | 2003-02-20 | 2004-09-02 | Sumitomo Electric Industries, Ltd. | Coated optical fiber and coated optical fiber with connector |
| CN100378483C (en) * | 2003-02-20 | 2008-04-02 | 住友电气工业株式会社 | Coated optical fiber and coated optical fiber with connector |
| WO2008041724A1 (en) | 2006-10-03 | 2008-04-10 | The Furukawa Electric Co., Ltd. | Optical fiber ribbon |
| JP2013037192A (en) * | 2011-08-08 | 2013-02-21 | Furukawa Electric Co Ltd:The | Coated optical fiber tape and optical fiber cable |
| JP2013178346A (en) * | 2012-02-28 | 2013-09-09 | Furukawa Electric Co Ltd:The | Optical fiber ribbon and method for manufacturing the same |
| JP2016103034A (en) * | 2016-01-08 | 2016-06-02 | 古河電気工業株式会社 | Optical fiber ribbon and optical fiber cable |
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|---|---|---|---|---|
| WO2004074898A1 (en) * | 2003-02-20 | 2004-09-02 | Sumitomo Electric Industries, Ltd. | Coated optical fiber and coated optical fiber with connector |
| CN100378483C (en) * | 2003-02-20 | 2008-04-02 | 住友电气工业株式会社 | Coated optical fiber and coated optical fiber with connector |
| US7542644B2 (en) | 2003-02-20 | 2009-06-02 | Sumitomo Electric Industries, Ltd. | Coated optical fiber and coated optical fiber with connector |
| WO2008041724A1 (en) | 2006-10-03 | 2008-04-10 | The Furukawa Electric Co., Ltd. | Optical fiber ribbon |
| US7689080B2 (en) | 2006-10-03 | 2010-03-30 | The Furukawa Electric Co., Ltd. | Optical fiber ribbon |
| JP2013037192A (en) * | 2011-08-08 | 2013-02-21 | Furukawa Electric Co Ltd:The | Coated optical fiber tape and optical fiber cable |
| JP2013178346A (en) * | 2012-02-28 | 2013-09-09 | Furukawa Electric Co Ltd:The | Optical fiber ribbon and method for manufacturing the same |
| JP2016103034A (en) * | 2016-01-08 | 2016-06-02 | 古河電気工業株式会社 | Optical fiber ribbon and optical fiber cable |
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| JP4715981B2 (en) | 2011-07-06 |
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