JPH02280106A - Optical fiber cable - Google Patents
Optical fiber cableInfo
- Publication number
- JPH02280106A JPH02280106A JP1102019A JP10201989A JPH02280106A JP H02280106 A JPH02280106 A JP H02280106A JP 1102019 A JP1102019 A JP 1102019A JP 10201989 A JP10201989 A JP 10201989A JP H02280106 A JPH02280106 A JP H02280106A
- Authority
- JP
- Japan
- Prior art keywords
- film
- optical fiber
- cable
- fiber cable
- heat
- 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 36
- 229920003235 aromatic polyamide Polymers 0.000 claims abstract description 20
- 239000011247 coating layer Substances 0.000 claims abstract description 8
- 239000010410 layer Substances 0.000 claims abstract description 8
- 239000004760 aramid Substances 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 abstract description 15
- 239000010408 film Substances 0.000 description 58
- 238000010438 heat treatment Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 229920000642 polymer Polymers 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 238000006116 polymerization reaction Methods 0.000 description 5
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 150000004984 aromatic diamines Chemical class 0.000 description 3
- 125000003118 aryl group Chemical group 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 238000007765 extrusion coating Methods 0.000 description 3
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229920001721 polyimide Polymers 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- 239000004695 Polyether sulfone Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 125000005843 halogen group Chemical group 0.000 description 2
- 229920006015 heat resistant resin Polymers 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 229920002492 poly(sulfone) Polymers 0.000 description 2
- 229920006393 polyether sulfone Polymers 0.000 description 2
- 229920002050 silicone resin Polymers 0.000 description 2
- 125000001424 substituent group Chemical group 0.000 description 2
- LXEJRKJRKIFVNY-UHFFFAOYSA-N terephthaloyl chloride Chemical compound ClC(=O)C1=CC=C(C(Cl)=O)C=C1 LXEJRKJRKIFVNY-UHFFFAOYSA-N 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 125000006274 (C1-C3)alkoxy group Chemical group 0.000 description 1
- WZCQRUWWHSTZEM-UHFFFAOYSA-N 1,3-phenylenediamine Chemical compound NC1=CC=CC(N)=C1 WZCQRUWWHSTZEM-UHFFFAOYSA-N 0.000 description 1
- MGLZGLAFFOMWPB-UHFFFAOYSA-N 2-chloro-1,4-phenylenediamine Chemical compound NC1=CC=C(N)C(Cl)=C1 MGLZGLAFFOMWPB-UHFFFAOYSA-N 0.000 description 1
- MSWAXXJAPIGEGZ-UHFFFAOYSA-N 2-chlorobenzene-1,4-dicarbonyl chloride Chemical compound ClC(=O)C1=CC=C(C(Cl)=O)C(Cl)=C1 MSWAXXJAPIGEGZ-UHFFFAOYSA-N 0.000 description 1
- YBRVSVVVWCFQMG-UHFFFAOYSA-N 4,4'-diaminodiphenylmethane Chemical compound C1=CC(N)=CC=C1CC1=CC=C(N)C=C1 YBRVSVVVWCFQMG-UHFFFAOYSA-N 0.000 description 1
- HLBLWEWZXPIGSM-UHFFFAOYSA-N 4-Aminophenyl ether Chemical compound C1=CC(N)=CC=C1OC1=CC=C(N)C=C1 HLBLWEWZXPIGSM-UHFFFAOYSA-N 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 238000012695 Interfacial polymerization Methods 0.000 description 1
- 239000004962 Polyamide-imide Substances 0.000 description 1
- 239000004697 Polyetherimide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000003848 UV Light-Curing Methods 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 229920006038 crystalline resin Polymers 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 125000000816 ethylene group Chemical group [H]C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 150000004986 phenylenediamines Chemical class 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 229920001601 polyetherimide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000013557 residual solvent Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
Landscapes
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は光ファイバーケーブルに関し、さらに詳しくは
耐熱、耐低温安定性が要求される光ファイバーケーブル
に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an optical fiber cable, and more particularly to an optical fiber cable that requires heat resistance and low temperature stability.
［従来の技術］
光ファイバーケーブルは大容量通信を可能にすることか
らその応用範囲が拡大しており、長距離通信網の基幹回
線などに利用される場合も増加している。このような状
況の下で光ファイバーケーブルは種々の環境下に置かれ
ることになり、耐熱あるいは耐低温特性に優れたケーブ
ルの開発が重要になってきている。[Prior Art] Optical fiber cables have expanded their range of applications because they enable large-capacity communications, and are increasingly being used as backbone lines in long-distance communication networks. Under these circumstances, optical fiber cables are placed in various environments, and it has become important to develop cables with excellent heat resistance or low temperature resistance.
光ファイバーケーブルの対温度安定性は光ファイバー心
線の温度特性もさることながら、その被覆材の特性に依
存する部分が大きく、被覆層の寸法変化が光ファイバー
心線に与えるマイクロベンディングによって伝送損失が
増大するため、被覆層の材質あるいは構造の選定は重要
である。これにより、ケーブルの被覆材としては従来の
ナイロン、ポリエチレン、塩化ビニルなどに対してより
耐熱性の高いフッ素系樹脂（ＦＥＰ：フッ化エチレン・
フッ化プロピレン共重合体、ＰＦＡ：ポリテトラフルオ
ロエチレン・パーフロオロアルキルビニルエーテル共重
合体など）、ポリアミドイミド、ポリスルホン、ポリエ
ーテルスルホン、ポリイミドなどの樹脂が用いられるよ
うになってきている。The temperature stability of an optical fiber cable depends not only on the temperature characteristics of the optical fiber core, but also on the properties of its coating material, and transmission loss increases due to microbending caused by dimensional changes in the coating layer on the optical fiber core. Therefore, selection of the material or structure of the covering layer is important. As a result, fluorine-based resin (FEP: fluorinated ethylene resin) has higher heat resistance than conventional nylon, polyethylene, vinyl chloride, etc.
Resins such as fluorinated propylene copolymer, PFA (polytetrafluoroethylene/perfluoroalkyl vinyl ether copolymer, etc.), polyamideimide, polysulfone, polyethersulfone, polyimide, etc. have come to be used.
し発明が解決しようとする課題］
光ファイバーケーブルの被覆層として前述の樹脂を押出
成形あるいはコーティングによって成形する場合には、
成形時の歪の発生が大きく、機械的強度も小さいため、
テープ状に加工した耐熱フィルムをケーブル外周部にス
パイラル状に巻回することが例えば特開昭６２−１９４
２０８などで提案されている。しかし、一般に耐熱フィ
ルムと呼ばれるものの中でも、ポリスルホン、ポリエテ
ルスルホン、ポリエーテルイミドなどの非品性樹脂から
成るフィルムは、ケーブル外周への巻回のように応力下
で小さな曲率で保持されるとひび割れを起こすストレス
クラッキングという現象を生じるために不適である。一
方、ポリイミドフィルムなどは結晶性樹脂であるため前
記のような問題は生じないが、それらは一般に高価であ
り、特にフィルム厚さが２０μｍより薄い場合には製造
が難しくなるためこの傾向がより強い。このフィルムの
厚さについては、ケーブルを軽量化する、あるいは光フ
ァイバー心線に与える側圧を減少させるという点から薄
い方がケーブル特性上好ましい。[Problems to be Solved by the Invention] When molding the above-mentioned resin as a coating layer of an optical fiber cable by extrusion molding or coating,
Due to the large amount of distortion generated during molding and low mechanical strength,
For example, in Japanese Patent Application Laid-Open No. 62-194, a heat-resistant film processed into a tape shape is wound spirally around the outer circumference of the cable.
208, etc. However, even among what are generally called heat-resistant films, films made of non-grade resins such as polysulfone, polyethersulfone, and polyetherimide tend to crack when held under stress with a small curvature, such as when wrapped around the outer circumference of a cable. It is unsuitable because it causes a phenomenon called stress cracking. On the other hand, since polyimide films are crystalline resins, they do not suffer from the above-mentioned problems, but they are generally expensive and are particularly difficult to manufacture when the film thickness is less than 20 μm, so this tendency is stronger. . Regarding the thickness of this film, it is preferable from the viewpoint of cable characteristics that it be thinner in order to reduce the weight of the cable or to reduce the lateral pressure applied to the optical fiber core wire.
本発明は以上のような課題を解決し、耐熱耐低温特性に
優れ、安価な光ファイバーケーブルを提供することを目
的とするものである。It is an object of the present invention to solve the above-mentioned problems and provide an inexpensive optical fiber cable that has excellent heat and low temperature resistance characteristics.
［課題を解決するための手段］
本発明は、単心または複数心の光ファイバー心線と緩衝
層および／または抗張力体とから成る集合体の外周に、
耐熱フィルムから成る被覆層を設けた光ファイバーケー
ブルにおいて、該耐熱フィルムが厚さ２μｍ以上２０μ
ｍ以下、フィルム長手方向の熱膨張係数が３． ５ ｘ
１０−’ （１／’Ｃ）以下、２５０℃での熱収縮率
が５．０％以下の芳香族ポリアミドフィルムであること
を特徴とするものである。[Means for Solving the Problems] The present invention provides a structure in which, on the outer periphery of an assembly consisting of a single-core or multi-core optical fiber, a buffer layer and/or a tensile strength member,
In an optical fiber cable provided with a coating layer made of a heat-resistant film, the heat-resistant film has a thickness of 2 μm or more and 20 μm or more.
m or less, the coefficient of thermal expansion in the longitudinal direction of the film is 3. 5 x
It is characterized by being an aromatic polyamide film having a heat shrinkage rate of 10-'(1/'C) or less and a heat shrinkage rate of 5.0% or less at 250°C.
本発明で使用する光ファイバー心線は、石英、多成分ガ
ラスなどから成る光ファイバーにＵＶ硬化塗料、シリコ
ン樹脂、ナイロン樹脂などの被覆を施したものでその構
成に特に限定はない。またグレーティドインデックス形
、ステップインデックス形、その他種々のものから選択
することができる。The optical fiber core used in the present invention is an optical fiber made of quartz, multi-component glass, etc., coated with UV curing paint, silicone resin, nylon resin, etc., and its structure is not particularly limited. Further, it is possible to select from various types such as a graded index type, a step index type, and others.
本発明における芳香族ポリアミドフィルムとは、一般式
％式％
で示される繰返し構成単位を単独または共重合の形で含
む芳香族ポリアミド重合体を少なくとも８０％以上含む
重合体から成るフィルムである。The aromatic polyamide film in the present invention is a film made of a polymer containing at least 80% or more of an aromatic polyamide polymer containing repeating units represented by the general formula %, either alone or in copolymerized form.
ここでＡｒ、、Ａｒ２．Ａｒ、は少なくとも１個の芳香
環を含み、同一でも異なっていてもよく、これらの代表
例としては次のものが挙げられる。Here, Ar, , Ar2. Ar contains at least one aromatic ring, which may be the same or different, and representative examples thereof include the following.
ここでＸは、
０− −ＣＨ２−、−８ｏ２
Ｈ３
Ｓ〜、 −ＣＯ−−Ｃ
ＣＨ３
から選ばれる。またこれらの芳香環の環上の水素原子の
一部がハロゲン基、ニトロ基、０１〜ｃ３のアルキル基
、Ｃ１〜Ｃ３のアルコキシ基から選ばれる置換基で置換
されているものも含み、さらに上記一般式中でアミド結
合を構成する窒素原子に結合する水素原子が置換基で置
換されているものも含む。Here, X is selected from 0--CH2-, -8o2H3S~, -CO--CCH3. These aromatic rings also include those in which a portion of the hydrogen atoms on the ring are substituted with a substituent selected from a halogen group, a nitro group, an 01-c3 alkyl group, and a C1-C3 alkoxy group. It also includes those in which the hydrogen atom bonded to the nitrogen atom constituting the amide bond in the general formula is substituted with a substituent.
これらの芳香族ポリアミドの内、重合体中のベンゼン環
の５０％以上がパラ位で結合されているものがフィルム
に成形した場合にヤング率が大きくなり易く、したがっ
て薄いフィルムが製造し易い点で好ましく、さらにベン
ゼン環の４０％以上が環上の水素原子の一部をハロゲン
基などで置換されているものが、湿度膨張係数が小さく
なる点において好ましい。Among these aromatic polyamides, those in which 50% or more of the benzene rings in the polymer are bonded at the para position tend to have a large Young's modulus when formed into a film, and are therefore easy to manufacture into thin films. Preferably, 40% or more of the benzene rings have some of the hydrogen atoms on the rings substituted with halogen groups, etc., from the viewpoint of reducing the humidity expansion coefficient.
本発明の芳香族ポリアミドフィルムの厚さは２μｍ以上
２０μｍ以下、好ましくは２μｍ以上１０μｍである。The thickness of the aromatic polyamide film of the present invention is 2 μm or more and 20 μm or less, preferably 2 μm or more and 10 μm or less.
２μｍ未満ではフィルムの巻回操作が、フィルムのステ
ィフネス（腰の強さ）が小さいために著しく困難になる
ため好ましくなく、またフィルムが２０μｍを越える厚
い場合には、フィルムをスパイラル状に重ね巻きあるい
は開き巻きした時に生じる段差（フィルムが重なってい
る部分と重ならない部分との差）が大きくなり、この部
分での光ファイバー心線への側圧の変動が大きくなるた
めに一種のマイクロベンディングのような状態を引き起
こして伝送損失が増大するために好ましくない。このよ
うな薄いフィルムは、ポリイミドフィルムでは製造する
ことが困難であり製造された場合でも非常に高価になる
のであるが、芳香族ポリアミドフィルムの場合は製造方
法の点からも、フィルムの高ヤング率化が容易である点
からも薄いフィルムが安価に精度良く製造できるため有
利である。この点からフィルムの長手方向のヤング率は
５００ （ｋｇ／ｍｍ２）以上であることが好ましい。If the thickness is less than 2 μm, it is undesirable to wind the film because it becomes extremely difficult due to the low stiffness of the film, and if the film is thicker than 20 μm, it may be necessary to wind the film spirally. The difference in level (difference between the overlapped part and the non-overlapping part of the film) that occurs when the film is unfolded becomes large, and the fluctuation of the lateral pressure on the optical fiber at this part becomes large, resulting in a kind of micro-bending situation. This is undesirable because it causes an increase in transmission loss. It is difficult to produce such a thin film using polyimide film, and even if it is produced, it is very expensive.However, in the case of aromatic polyamide film, the film has a high Young's modulus due to the manufacturing method. It is advantageous in that thin films can be manufactured at low cost and with high precision in terms of ease of production. From this point of view, the Young's modulus of the film in the longitudinal direction is preferably 500 (kg/mm2) or more.
寸法安定性の面から本発明の芳香族ポリアミドフィルム
の熱膨張係数は長手方向について３．５ｘ １０−５（
１／’Ｃ）以下、好ましくは２．５Ｘ１０−’（１／℃
）以下であり、この範囲から外れる場合には光ファイバ
ー心線あるいは抗張力体として使用されるスチール線、
芳香族ポリアミド繊維などの熱膨張係数との差が大きく
なり、特に低温下でフィルムの収縮が大きくなってケー
ブル長軸方向にフィルムが引張るような状態となってケ
ーブルにマイクロベンディングを生じさせ、光の伝送損
失が増加するため不適である。In terms of dimensional stability, the thermal expansion coefficient of the aromatic polyamide film of the present invention is 3.5x 10-5 (
1/'C) or less, preferably 2.5X10-'(1/'C) or less
) or less, and if outside this range, steel wire used as optical fiber core or tensile strength body,
The difference between the coefficient of thermal expansion and that of aromatic polyamide fibers, etc. becomes large, and the shrinkage of the film becomes large, especially at low temperatures, causing the film to be stretched in the long axis direction of the cable, causing microbending in the cable. It is unsuitable because the transmission loss increases.
一方、高温下での寸法安定性という面から、本発明のフ
ィルムの熱収縮率は長手方向について、２５０℃で５．
０％以下、好ましくは３．０％以下である。この特性に
は２つの側面があり、１つはケーブルが高温に曝された
時にフィルムの収縮によって光ファイバー心線が締め付
けられて伝送損失が増加することを防ぐ意味と、ケーブ
ル製造工程においてフィルム巻回層の外側に耐熱樹脂を
押出し成形あるいはコーティング等によって積層する際
の加熱によって同様の現象が起こることを防ぐ意味とが
ある。On the other hand, in terms of dimensional stability at high temperatures, the heat shrinkage rate of the film of the present invention is 5.5 at 250°C in the longitudinal direction.
It is 0% or less, preferably 3.0% or less. This characteristic has two aspects: one is to prevent the optical fiber core from being tightened due to film shrinkage when the cable is exposed to high temperatures, increasing transmission loss, and the other is to prevent the film from being wound during the cable manufacturing process. The purpose is to prevent a similar phenomenon from occurring due to heating when a heat-resistant resin is laminated on the outside of the layer by extrusion molding or coating.
次に本発明の光ファイバーケーブルの製造方法について
説明する。Next, a method for manufacturing an optical fiber cable according to the present invention will be explained.
被覆層に用いる芳香族ポリアミドフィルムは以下の方法
によって得られる。まず芳香族ポリアミドの重合はアミ
ド系溶媒中での低温溶液重合や水系媒体を用いた界面重
合法などの公知の重合法により行なうことができる。次
に重合で得られたポリマー溶液あるいはポリマーを単離
した後に溶媒に再溶解したポリマー溶液からフィルムを
製膜する。The aromatic polyamide film used for the coating layer can be obtained by the following method. First, the aromatic polyamide can be polymerized by a known polymerization method such as low-temperature solution polymerization in an amide solvent or interfacial polymerization using an aqueous medium. Next, a film is formed from a polymer solution obtained by polymerization or a polymer solution obtained by isolating the polymer and redissolving it in a solvent.
製膜は公知の溶液製膜法によって行なうことができ、乾
式、湿式、乾湿式などの区別が溶液製膜法にはあるが、
いずれでも良く特に限定されない。Film formation can be performed by a known solution film forming method, and there are distinctions among solution film forming methods such as dry method, wet method, dry-wet method, etc.
Any one is fine and there is no particular limitation.
製膜中に通常フィルムは、２５０〜３５０℃で０゜１〜
１０分間程度の熱処理とフィルム長手方向、幅方向に１
．０〜５．０倍程度の延伸が施されるが、これらの操作
条件はフィルム特性のうち特に熱収縮率や熱膨張係数な
どに影響するため、ポリマー組成に応じて本発明に必要
な特性値となるように条件を適宜選択する。−船釣には
熱処理は温度が高く長時間である程、延伸は倍率が小さ
い程、熱収縮率は小さく熱膨張係数は大きくなる傾向に
ある。During film formation, the film is usually heated at 0°1 to 250°C to 350°C.
Heat treatment for about 10 minutes and heat treatment in the longitudinal and width directions of the film.
．． Stretching is performed by approximately 0 to 5.0 times, but these operating conditions affect the film properties, especially the thermal shrinkage rate and coefficient of thermal expansion, so the characteristic values required for the present invention may vary depending on the polymer composition. Select conditions appropriately so that -For boat fishing, the higher the temperature and the longer the heat treatment, and the lower the stretching ratio, the lower the thermal contraction rate and the higher the thermal expansion coefficient.
かくして得られたフィルムはテープ状にスリットした後
、光ファイバー心線と緩衝層および／または抗張力体と
から成る集合体の外周に、重ね巻きあるいは開き巻きで
スパイラル状に巻回される。The film thus obtained is slit into a tape shape, and then spirally wound around the outer periphery of an assembly consisting of an optical fiber core, a buffer layer, and/or a tensile strength member, in an overlapping or open winding manner.
ここで光ファイバー心線と緩衝層、抗張力体の材質、構
造については本発明では特に限定はない。Here, the present invention does not particularly limit the materials and structures of the optical fiber core, buffer layer, and tensile strength body.
テープ状のフィルムを巻回後、必要に応じてフッ素系樹
脂などの耐熱樹脂を押出し成形あるいはコーティングな
どの方法によってフィルム外面に積層し、本発明の光フ
ァイバーケーブルが製造される。得られた光ファイバー
ケーブルは単独で使用されてもよく、また電カケープル
内に埋設されたような状態で使用されてもよく特に限定
されない。After winding the tape-shaped film, a heat-resistant resin such as a fluororesin is laminated on the outer surface of the film by extrusion molding or coating, as necessary, to produce the optical fiber cable of the present invention. The obtained optical fiber cable may be used alone or may be used embedded in an electric cable without any particular limitation.
［用途］
以上のようにして製造された光ファイバーケープルは一
般の光通信用ケーブルとして使用することができるが、
特に屋外に架設されるような環境変動の大きな用途に好
適に使用することができる。[Application] The optical fiber cable manufactured as described above can be used as a general optical communication cable.
In particular, it can be suitably used in applications where the environment is subject to large fluctuations, such as those installed outdoors.
［特性の評価方法］ 本発明の特性値の評価方法は次のとおりである。[Characteristics evaluation method] The method for evaluating characteristic values of the present invention is as follows.
（１）熱膨張係数
熱機械分析計（ＴＭＡ）を用いて、熱収縮や吸脱湿の影
響を除くためにフィルムを一旦１５０℃まで加熱後、徐
々に冷却した時の８０℃〜１５０℃の間の範囲における
寸法変化から計算した。(1) Using a thermal expansion coefficient thermomechanical analyzer (TMA), the film was heated to 150°C and then gradually cooled to eliminate the effects of thermal contraction and moisture absorption and desorption. Calculated from dimensional changes in the range between.
（２）熱収縮率
幅１０ｍｍ、試長１００ｍｍのフィルムサンプルを、無
荷重で、２５０℃の熱風オーブン中で１０分間熱処理を
行ない、次式によって熱収縮率（％）を算出した。(2) Heat Shrinkage A film sample with a width of 10 mm and a sample length of 100 mm was heat treated in a hot air oven at 250° C. for 10 minutes without any load, and the heat shrinkage (%) was calculated using the following formula.
［実施例］ 本発明を実施例に基づいて説明する。[Example] The present invention will be explained based on examples.
実施例１
Ｎ−メチルピロリドン（ＮＭＰ）に芳香族ジアミン成分
として９０モル％に相当する２−クロルパラフェニレン
ジアミンと１０モル％に相当する４、４′ −ジアミノ
ジフェニルエーテルとを溶解させ、これに芳香族二酸ク
ロリド成分として２０モル％に相当するテレフタル酸ク
ロリドと８０モル％に相当する２−クロルテレフタル酸
クロリドとを添加し、２時間撹拌して重合を完了した。Example 1 2-chloroparaphenylenediamine corresponding to 90 mol% and 4,4'-diaminodiphenyl ether corresponding to 10 mol% as aromatic diamine components are dissolved in N-methylpyrrolidone (NMP), and aromatic diamine components are dissolved in N-methylpyrrolidone (NMP). Terephthalic acid chloride corresponding to 20 mol% and 2-chloroterephthalic acid chloride corresponding to 80 mol% were added as group diacid chloride components, and the mixture was stirred for 2 hours to complete polymerization.
これを水酸化カルシウムで中和して、ポリマ濃度１０重
量％、粘度３０６０ポイズの芳香族ポリアミド溶液を得
た。This was neutralized with calcium hydroxide to obtain an aromatic polyamide solution having a polymer concentration of 10% by weight and a viscosity of 3060 poise.
このポリマー溶液をステンレス製ベルト上に流延し、１
３０℃の熱風で４．５分間加熱して溶媒を蒸発させ自己
保持性を得たフィルムをベルトから連続的に剥離した。This polymer solution was cast onto a stainless steel belt and
The film was heated with hot air at 30° C. for 4.5 minutes to evaporate the solvent to obtain self-retention properties and was continuously peeled off from the belt.
次に水槽内へフィルムを導入して残存溶媒と中和で生じ
た塩化カルシウムの水抽出を行ない、テンターで水分の
乾燥と熱処理を行なって厚さ６μｍの芳香族ポリアミド
フィルムを得た。この間にフィルム長手方向と幅方向に
各々１．２倍、１．３倍延伸を行ない、熱処理は３００
℃で１．５分間行なった。Next, the film was introduced into a water tank, and residual solvent and calcium chloride produced by neutralization were extracted with water, and water was dried using a tenter and heat treatment was performed to obtain an aromatic polyamide film with a thickness of 6 μm. During this time, the film was stretched 1.2 times and 1.3 times in the longitudinal direction and width direction, respectively, and the heat treatment was performed at 300%
It was carried out for 1.5 minutes at ℃.
得られたフィルムの物性値はフィルム長手方向について
熱膨張係数０． ９ ｘ １０−５（１／’Ｃ）、２５
０℃の熱収縮率２．６％であった。The physical properties of the obtained film include a coefficient of thermal expansion of 0.0 in the longitudinal direction of the film. 9 x 10-5 (1/'C), 25
The heat shrinkage rate at 0°C was 2.6%.
次に、光ファイバーにシリコン樹脂被覆を施した光ファ
イバー心線７本にパラ系芳香族ポリアミド繊維から成る
抗張力体として縦添えしたものの外周に、前記の芳香族
ポリアミドフィルムを幅８ｍｍにスリットしたテープを
重なり部がテープ幅の約１／３となるように重ね巻きし
、さらにその外側にＰＦＡ樹脂を押出し被覆して直径１
０ｍｍの光ファイバーケーブルを作成した。Next, a tape made by slitting the aromatic polyamide film to a width of 8 mm was layered around the outer circumference of seven optical fiber cores made of optical fibers coated with silicone resin and attached vertically as tensile strength members made of para-aromatic polyamide fibers. Wrap the tape in layers so that the width is about 1/3 of the tape width, and then extrude and coat the outside with PFA resin to create a diameter of 1/3.
A 0mm optical fiber cable was created.
作成直後の常温における伝送損失（波長１．１μｍ）を
測定したところ２（ｄＢ／ｋｍ）であり、次にケーブル
を一４０℃下に置いたところ伝送損失は８ （ｄＢ／ｋ
ｍ） 、更にこのケーブルを一旦２６０℃で５分間加熱
した後に常温まで冷却して測定した伝送損失は５ （ｄ
Ｂ／ｋｍ）と非常に温度安定性が良好であった。When the transmission loss (wavelength 1.1 μm) at room temperature was measured immediately after the cable was created, it was 2 (dB/km), and when the cable was then placed at -40°C, the transmission loss was 8 (dB/km).
m), and the transmission loss measured by heating this cable for 5 minutes at 260°C and then cooling it to room temperature was 5 (d
B/km) and had very good temperature stability.
実施例２
芳香族ジアミン成分として７０モル％の２−クロル−ｐ
−フェニレンジアミンと３０モル％の４゜４′−ジアミ
ノジフェニルスルホンを用い、芳香族二酸クロリド成分
としてテレフタル酸クロリドを用い、実施例１と延伸倍
率及び熱処理条件を変えた他は同様の方法で重合、製膜
を行ない厚さ１０μｍの芳香族ポリアミドフィルムを得
た。Example 2 70 mol% 2-chloro-p as aromatic diamine component
- Using the same method as in Example 1 except that phenylene diamine and 30 mol% of 4゜4'-diaminodiphenylsulfone were used, terephthalic acid chloride was used as the aromatic diacid chloride component, and the stretching ratio and heat treatment conditions were changed. Polymerization and film formation were performed to obtain an aromatic polyamide film with a thickness of 10 μm.
得られたフィルムを使用して光ファイバーケーブルの作
成および伝送損失の評価を行なったところ第１表のよう
に耐熱、耐低温特性に優れた性質を示した。Using the obtained film, an optical fiber cable was prepared and the transmission loss was evaluated, and as shown in Table 1, it showed excellent heat resistance and low temperature resistance properties.
比較例１〜２
実施例１で調整したポリマー溶液から、実施例１とは延
伸と熱処理条件およびフィルム厚さを変化させて製膜を
行ない、実施例１と同様の光ファイバーの作成および伝
送損失の測定を行なった結果を第１表に示す。Comparative Examples 1 to 2 Films were formed from the polymer solution prepared in Example 1 by changing the stretching and heat treatment conditions and film thickness, and the same optical fibers as in Example 1 were created and the transmission loss was reduced. The results of the measurements are shown in Table 1.
比較例１のように厚いフィルムを使用した場合にはケー
ブル作成時、加熱後の伝送損失が大きく、比較例２のよ
うに熱収縮率の大きな場合には加熱後の伝送特性が良好
ではなかった。When a thick film was used as in Comparative Example 1, the transmission loss after heating was large during cable creation, and when the heat shrinkage rate was large as in Comparative Example 2, the transmission characteristics after heating were not good. .
比較例３
メタフェニレンジアミンと４，４′−ジアミノジフェニ
ルメタンから実施例１と同様の方法で重合、製膜を行な
い、得られた芳香族ポリアミドフィルムを用いて光ファ
イバーケーブルの作成、伝送特性の測定を行なったが、
低温下および加熱後の伝送損失は大きなものであった。Comparative Example 3 Polymerization and film formation were performed from metaphenylene diamine and 4,4'-diaminodiphenylmethane in the same manner as in Example 1, and the resulting aromatic polyamide film was used to create an optical fiber cable and measure transmission characteristics. I did it, but
The transmission loss was large at low temperatures and after heating.
結果を第１表に示す。The results are shown in Table 1.
［発明の効果］
以上のように、本発明の光ファイバーケーブルでは特定
の熱膨張係数および熱収縮率を有する薄い芳香族ポリア
ミドフィルムをケーブル被覆層として使用するため、高
温、低温環境下での伝送効率の低下が小さく、また安価
なケーブルの製造が可能である。[Effects of the Invention] As described above, in the optical fiber cable of the present invention, since a thin aromatic polyamide film having a specific thermal expansion coefficient and thermal contraction rate is used as a cable coating layer, the transmission efficiency is improved in high-temperature and low-temperature environments. It is possible to manufacture a cable at low cost with a small decrease in .
Claims (1)
または抗張力体とから成る集合体の外周に、耐熱フィル
ムから成る被覆層を設けた光ファイバーケーブルにおい
て、該耐熱フィルムが厚さ２μｍ以上２０μｍ以下、フ
ィルム長手方向の熱膨張係数が３．５×１０＾−＾５（
１／℃）以下、２５０℃での熱収縮率が５．０％以下の
芳香族ポリアミドフィルムであることを特徴とする光フ
ァイバーケーブル。Single or multi-core optical fiber, buffer layer and/or
Or, in an optical fiber cable in which a coating layer made of a heat-resistant film is provided on the outer periphery of an assembly consisting of a tensile strength member, the heat-resistant film has a thickness of 2 μm or more and 20 μm or less, and a coefficient of thermal expansion in the longitudinal direction of the film of 3.5 × 10^. −＾５(
An optical fiber cable characterized in that it is an aromatic polyamide film having a heat shrinkage rate of 5.0% or less at 250°C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1102019A JP2765039B2 (en) | 1989-04-21 | 1989-04-21 | Fiber optic cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1102019A JP2765039B2 (en) | 1989-04-21 | 1989-04-21 | Fiber optic cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02280106A true JPH02280106A (en) | 1990-11-16 |
| JP2765039B2 JP2765039B2 (en) | 1998-06-11 |
Family
ID=14316040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1102019A Expired - Fee Related JP2765039B2 (en) | 1989-04-21 | 1989-04-21 | Fiber optic cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2765039B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015016240A1 (en) * | 2013-08-02 | 2015-02-05 | 株式会社フジクラ | Optical fiber cable |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58141202U (en) * | 1982-03-18 | 1983-09-22 | 三菱レイヨン株式会社 | fiber optic cable |
| JPS6019010U (en) * | 1983-07-18 | 1985-02-08 | 日本電信電話株式会社 | fiber optic cable |
| JPS60247605A (en) * | 1984-05-24 | 1985-12-07 | Mitsubishi Rayon Co Ltd | Optical transmission plastic fiber |
-
1989
- 1989-04-21 JP JP1102019A patent/JP2765039B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58141202U (en) * | 1982-03-18 | 1983-09-22 | 三菱レイヨン株式会社 | fiber optic cable |
| JPS6019010U (en) * | 1983-07-18 | 1985-02-08 | 日本電信電話株式会社 | fiber optic cable |
| JPS60247605A (en) * | 1984-05-24 | 1985-12-07 | Mitsubishi Rayon Co Ltd | Optical transmission plastic fiber |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015016240A1 (en) * | 2013-08-02 | 2015-02-05 | 株式会社フジクラ | Optical fiber cable |
| JP2015031810A (en) * | 2013-08-02 | 2015-02-16 | 株式会社フジクラ | Optical fiber cable |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2765039B2 (en) | 1998-06-11 |
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