JPH02157713A - Nonmetal type optical cable - Google Patents
Nonmetal type optical cableInfo
- Publication number
- JPH02157713A JPH02157713A JP63310057A JP31005788A JPH02157713A JP H02157713 A JPH02157713 A JP H02157713A JP 63310057 A JP63310057 A JP 63310057A JP 31005788 A JP31005788 A JP 31005788A JP H02157713 A JPH02157713 A JP H02157713A
- Authority
- JP
- Japan
- Prior art keywords
- optical cable
- layer
- sheath
- hygroscopic material
- metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 50
- 229910052755 nonmetal Inorganic materials 0.000 title abstract 2
- 239000000463 material Substances 0.000 claims abstract description 45
- -1 polyethylene Polymers 0.000 claims abstract description 15
- 239000004698 Polyethylene Substances 0.000 claims abstract description 13
- 229920000573 polyethylene Polymers 0.000 claims abstract description 13
- 229920001577 copolymer Polymers 0.000 claims abstract description 6
- 229910052751 metal Inorganic materials 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims abstract description 4
- 229920000058 polyacrylate Polymers 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 10
- 238000001125 extrusion Methods 0.000 abstract description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 abstract description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 abstract 1
- 239000002253 acid Substances 0.000 abstract 1
- 150000002739 metals Chemical class 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 239000013307 optical fiber Substances 0.000 description 11
- 239000000835 fiber Substances 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 230000002745 absorbent Effects 0.000 description 3
- 239000002250 absorbent Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 229920001684 low density polyethylene Polymers 0.000 description 3
- 239000004702 low-density polyethylene Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000012792 core layer Substances 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
本発明は、光通信用の無金属型光ケーブルの構造の改良
に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in the structure of a metal-free optical cable for optical communications.
更に詳しくは、本発明は、優れた透湿防止性を有する無
金属型光ケーブルに関するのである。More specifically, the present invention relates to a metal-free optical cable having excellent moisture permeation prevention properties.
近年、光ファイバの優れた特性を生がし、かつ経済性の
面から光(ファイバ)ケーブルの使用の拡大が急速に進
んできている。In recent years, the use of optical (fiber) cables has been rapidly expanding, taking advantage of the excellent characteristics of optical fibers and being economical.
このような光ファイバの優れた特性の1つとして、光フ
ァイバの無誘導性という特性を生かした無金属型光ケー
ブルがある。One of the excellent properties of such optical fibers is metal-free optical cables that take advantage of the non-inductive property of optical fibers.
この無金属型光ファイバの代表的な構造のものとして、
第2図に示すようなものが良く知られている。The typical structure of this metal-free optical fiber is as follows:
The one shown in FIG. 2 is well known.
これは、光ケーブルの中心部に、通常FRPからなる抗
張力体(テンシシンメンバ)1を配し、その周りに複数
本の光フアイバ心線2を集合させ、これら光ケーブルコ
アの周りに緩衝材3を充填してからプラスチックテープ
状の押え巻4を巻き付け、その上に直接にポリエチレン
などの外被(シース)5を被覆してなるものである。し
かし、この場合、ケーブル外被として良く用いられてい
るLAPシース(アルミテープをラミネートしたポリエ
チレン製外被)の構造が、無金属型と相反することから
採用できない。In this method, a tensile member 1 usually made of FRP is placed in the center of the optical cable, a plurality of optical fiber cores 2 are gathered around it, and a cushioning material 3 is placed around the optical cable core. After filling, a presser wrap 4 in the form of a plastic tape is wrapped around it, and a sheath 5 made of polyethylene or the like is directly covered thereon. However, in this case, the structure of the LAP sheath (polyethylene sheath laminated with aluminum tape), which is often used as a cable sheath, cannot be adopted because it conflicts with a metal-free type.
このために、従来の無金属型光ケーブルでは、前記LA
Pシースを使用できず、ポリエチレン等プラスチック単
独シースとなっていて、前記LAPシースの目的である
透湿・透水を防止する作用は、このプラスチックのみの
外被からは期待できず、光ケーブルの信転性に関して問
題があった。For this reason, in conventional metal-free optical cables, the LA
A P sheath cannot be used, and the sheath is made of only plastic such as polyethylene.The purpose of the LAP sheath, which prevents moisture and water permeation, cannot be expected from an outer sheath made only of plastic, and the reliability of the optical cable is poor. There was a problem with sexuality.
すなわち、無金属型光ケーブルでは、光ケーブル内へ水
蒸気が透湿することにより、光ファイバのn値が低下し
、その寿命保証ができなくなる問題があった(昭和58
年7月10日オーム社発行「光フアイバケーブル」電気
通信協会用、福富秀雄著)。In other words, with metal-free optical cables, water vapor permeates into the optical cable, causing the n-value of the optical fiber to decrease, making it impossible to guarantee its lifespan (1973).
``Optical Fiber Cable'' published by Ohmsha on July 10, 2013, for the Telecommunications Association, written by Hideo Fukutomi).
本発明は、このような従来の無金属型光ケーブルの構造
上の欠点を克服し、ポリエチレン等のプラスチック製外
被の使用に伴うi3湿・透水を防止し、光ケーブルの信
転性を向上させ、その寿命保証を確実とする手段を提供
するものである。The present invention overcomes the structural defects of such conventional metal-free optical cables, prevents moisture and water permeation caused by the use of plastic jackets such as polyethylene, improves the reliability of optical cables, This provides a means to ensure its lifetime guarantee.
[課題を解決するための手段]
本発明者らは、無金属型光ケーブルの外被構造として、
内層に吸湿性材料を、外層に非吸湿性材料を用いた2層
外被(シース)構造とすることにより、透湿防止効果が
格段に向上しかつ光ケーブルとしての信頼性が向上した
新規な無金属型光ケーブルを完成するに至った。[Means for Solving the Problems] The present inventors have developed an outer sheath structure for a metal-free optical cable.
By adopting a two-layer sheath structure using a hygroscopic material for the inner layer and a non-hygroscopic material for the outer layer, the moisture permeation prevention effect is greatly improved and the reliability of the optical cable is improved. We have completed a metal optical cable.
即ち、本発明は
■金属を使用しない光ケーブル外被において、その外被
構造が少なくとも2層以上の構造からなり、しかもその
光ケーブル外被の最外層に非吸湿性材料層を配し、その
内層に吸湿性材料層を少なくとも一層有することを特徴
とするケーブル外被を有する無金属型光ケーブルである
。That is, the present invention provides (1) an optical cable jacket that does not use metal, the jacket structure of which is composed of at least two layers, and in which the outermost layer of the optical cable jacket is provided with a non-hygroscopic material layer; A metal-free optical cable having a cable jacket characterized by having at least one layer of hygroscopic material.
■その内層を構成する吸湿性材料層
リル酸塩、アクリル酸−アクリロニトリル共重合体であ
り、また、その外層を構成する非吸湿性材料がポリエチ
レンである、無金属型光ケーブルである。(2) It is a metal-free optical cable in which the inner layer of the hygroscopic material layer is lylate, acrylic acid-acrylonitrile copolymer, and the outer layer of the non-hygroscopic material is polyethylene.
■光ケーブル外被を構成する内・外層が前記非吸湿性材
料と吸湿性材料とを同時に押出し成型することにより形
成される、無金属型ケーブルである。(2) It is a metal-free cable in which the inner and outer layers constituting the optical cable jacket are formed by simultaneously extruding the non-hygroscopic material and the hygroscopic material.
本発明を、例えば、第1図に基づいて説明する。The present invention will be explained based on, for example, FIG.
1、は光ファイバ(心線)2を補強・支持するテンショ
ンメンバ(抗張力体)であり、通常、鋼線、ポリエチレ
ン被覆鋼線、FRP線などから構成されるが、単線でも
撚線でもよい、なお、FRP線が、無金属型の点から好
ましく使用される。1 is a tension member (tensile strength member) that reinforces and supports the optical fiber (core wire) 2, and is usually composed of steel wire, polyethylene-coated steel wire, FRP wire, etc., but it may also be a single wire or a stranded wire. Note that FRP wire is preferably used because it is metal-free.
2、は多数本の光ファイバを引き揃え、必要に応じて、
ポリエチレン系のチューブに収容した光フアイバ心線で
あり、テンションメンバの周りに複数本集合して配置す
る。2. Arrange a large number of optical fibers and as necessary,
These are optical fiber cores housed in a polyethylene tube, and are arranged in groups around a tension member.
3、は、光ケーブル内の空隙部に充填して、外力緩和効
果を示す、例えば繊維状の緩衝材である。3 is, for example, a fibrous cushioning material that is filled into a void in an optical cable and exhibits an external force-relaxing effect.
なお、これを吸湿性材ポー1で構成させることができ、
外被内層を構成する吸湿性材料層6と相まって、透湿・
透水防止作用がより効果的となる。Note that this can be made of a hygroscopic material Po 1,
Coupled with the hygroscopic material layer 6 that constitutes the inner layer of the outer jacket, moisture permeability and
The water permeation prevention effect becomes more effective.
4、は、光フアイバコアの周りに巻き付けるポリエチレ
ンなどプラスチックテープ状の押え巻である。4 is a plastic tape-shaped presser such as polyethylene that is wrapped around the optical fiber core.
5、は、2層以上の構造の外被(シース)を構成する、
ポリエチレン等の非吸湿性材料からなる外層であり、該
外層材として他にポリ塩化ビニル、エチレン−酢酸ビニ
ル系共重合体、架橋ポリエチレン等を挙げうる。5. constitutes a sheath with a structure of two or more layers,
The outer layer is made of a non-hygroscopic material such as polyethylene, and examples of the outer layer material include polyvinyl chloride, ethylene-vinyl acetate copolymer, and crosslinked polyethylene.
6、は、前記外被(シース)の内層を構成する、ポリア
クリル酸塩などの吸湿性材料であり、該内層材として他
に、アクリル系化合物(アクリロニトリル、(メタ)ク
リル酸又はそのエステル、アミド等)をグラフト重合し
たデンプン、該アクリル系化合物をグラフト重合したセ
ルロース、カルボキシメチルセルロース;アクリル酸−
アクリロニトリル共重合体のようなポリアクリル酸系重
合体などを挙げうるが、ポリアクリル酸塩又はアクリル
酸−アクリロニトリル共重合体が好ましく使用できる。6 is a hygroscopic material such as polyacrylate that constitutes the inner layer of the sheath, and the inner layer material may also include an acrylic compound (acrylonitrile, (meth)acrylic acid or its ester, starch graft-polymerized with amide, etc.), cellulose graft-polymerized with the acrylic compound, carboxymethylcellulose; acrylic acid-
Examples include polyacrylic acid-based polymers such as acrylonitrile copolymers, and polyacrylates or acrylic acid-acrylonitrile copolymers are preferably used.
本発明の2層構造の外被を製造するには、押出成形工程
で、外層のポリエチレン等のシース材の押出しと同時に
、その内側に吸湿性材料のタンデムコーティングを施す
方法が最も効果的であるが、他に予め外層のシースを成
形し、その内層に前記吸湿性材料の液をライニングする
など各層を別工程で行うこともできる。In order to manufacture the two-layer structure of the present invention, the most effective method is to simultaneously extrude the outer sheath material such as polyethylene in the extrusion molding process and apply a tandem coating of a hygroscopic material on the inside. However, it is also possible to form each layer in separate steps, such as by forming the outer sheath in advance and lining the inner layer with the liquid of the hygroscopic material.
なお、上記の別工程で行う場合には、吸湿性材料におけ
る水蒸気の吸収飽和時間が数時間〜数日であるので、両
工程をなるべく時間を空けずに行うことが必要である。In addition, when performing the above-mentioned separate steps, since the absorption saturation time of water vapor in the hygroscopic material is several hours to several days, it is necessary to perform both steps as close to each other as possible.
(作用)
本発明の無金属型光ケーブルでは、光ケーブル外被を構
成する内層として吸湿性材料の層を設けることで、光ケ
ーブル外被より侵入する水蒸気をケーブル外被に吸収で
きて、ケーブル内への水蒸気の侵入を軽減し、ケーブル
内に水蒸気を侵入させない構造となっている。(Function) In the metal-free optical cable of the present invention, by providing a layer of hygroscopic material as the inner layer constituting the optical cable jacket, water vapor that enters from the optical cable jacket can be absorbed into the cable jacket, and water vapor entering the cable can be absorbed. The structure reduces the amount of water vapor that enters the cable and prevents it from entering the cable.
このような防水作用をモデル的に説明すると、例えば、
ケーブルコア外径10++nφ、外被(シース)構造を
2層構造とし、低密度ポリエチレン外層1ms 、ポリ
アクリル酸塩の内層ll1mからなるケーブル外被の光
ケーブルをモデルにして理論的に計算すると、吸湿性材
料が水蒸気を吸収し、飽和に達して、水蒸気が前記外被
を通過するのに要する期間は約29年と計算されるので
、その長期間中は乾燥状態に保てるという作用があると
云える。To explain this kind of waterproofing effect using a model, for example,
When theoretically calculated using an optical cable model with a cable core outer diameter of 10++nφ and a two-layer sheath structure, consisting of a low-density polyethylene outer layer of 1 ms and an inner layer of polyacrylate of 1 1 m, the hygroscopicity It is calculated that it takes about 29 years for the material to absorb water vapor, reach saturation, and for the water vapor to pass through the jacket, so it can be said that it has the effect of keeping it dry for that long period of time. .
本発明を下記の実施例により、さらに説明するが、これ
は本発明の範囲を制限するものでない。The invention will be further illustrated by the following examples, which are not intended to limit the scope of the invention.
(実施例)
本発明の無金属型光ケーブルの構造による効果を確認す
るために、本発明に係わる吸湿性材料層6を内層にもつ
光ケーブル(タイプA)(実施例に相当)と核層をもた
ない従来の光ケーブル(タイプB)(比較例に相当)と
を、以下に示す処理工程で作製し、下記の実験を行った
。(Example) In order to confirm the effect of the structure of the metal-free optical cable of the present invention, an optical cable (type A) (corresponding to an example) having the hygroscopic material layer 6 according to the present invention as an inner layer and a core layer were also constructed. A conventional optical cable (type B) (corresponding to a comparative example) with a small diameter was fabricated using the processing steps shown below, and the following experiment was conducted.
殺1」−(準備);内径10m+e、外径14mm、厚
み2−個、長さ30cmの低密度ポリエチレン管(B)
サンプルおよび吸湿性材料内111mmと低密度ポリエ
チレン外層11とからなり、長さ30cmの2層構造の
管(A)サンプルとを夫々10本準備する。1" - (preparation); low density polyethylene pipe (B) with inner diameter 10m+e, outer diameter 14mm, thickness 2 pieces, length 30cm
Samples and 10 tubes (A) samples each having a two-layer structure with a length of 30 cm and consisting of a hygroscopic material inner layer of 111 mm and a low-density polyethylene outer layer 11 are prepared.
なお、吸湿性材料内層材としては、三菱油化■「プラウ
エツトG −260J (アクリル酸−アクリル酸塩−
アクリロニトリル共重合体)を使用した。In addition, as the inner layer material of the hygroscopic material, Mitsubishi Yuka ■ ``Prawett G-260J (acrylic acid-acrylate-
Acrylonitrile copolymer) was used.
ff1(乾燥);次に、この(^)(B)サンプルを8
0℃で12時間乾燥して、実験初期に吸湿していない状
態とした。ff1 (dry); Next, apply this (^) (B) sample to 8
It was dried at 0° C. for 12 hours to ensure that no moisture was absorbed at the beginning of the experiment.
)3J14 (吸水性MIA 維(7) 充填):次に
、80°Cテ12時間乾燥させた吸水性繊維(旭化成■
製rKKF」)Igを、夫々のサンプル内に充填する。) 3J14 (Water absorbent MIA fiber (7) filling): Next, water absorbent fiber (Asahi Kasei ■) dried at 80°C for 12 hours
rKKF'') Ig was loaded into each sample.
)3tM−土(到着):サンプルの両端を加熱して熱ン
容着する。) 3tM-Soil (arrival): Heat both ends of the sample and heat-fuse.
11LI(浸漬実験):サンプルを80°Cの水中に浸
漬し1ケ月間放置する。11LI (immersion experiment): The sample is immersed in water at 80°C and left for one month.
m(重量変化の測定);サンプル内の吸水性繊維を取り
出し、即時に重量を化学天秤で測定しくN・10)、そ
の変化量を算出した。m (Measurement of weight change): The water absorbent fibers in the sample were taken out and the weight was immediately measured using a chemical balance (N·10), and the amount of change was calculated.
それらの結果を表1に示した。The results are shown in Table 1.
このように、本発明の2層構造外被をもつ光ケーブル(
タイプA)では、吸水性繊維の重量変化は僅かに0.1
重量%であった。In this way, the optical cable (
In type A), the weight change of the water-absorbing fiber is only 0.1
% by weight.
このように光ケーブル外被の内側に吸湿性材料層を配置
することで、ケーブル内部を乾燥状態に保つことが可能
となることが分かる。It can be seen that by arranging the hygroscopic material layer inside the optical cable jacket in this way, it is possible to keep the inside of the cable dry.
表1
(発明の効果)
本発明においては、■光ケーブルを構成する外被として
、従来のようにポリエチレン等の非吸湿性材料層単独を
配した場合に比較して、とくに内層に吸湿性材料層を設
けた2層構造としたことにより、光ケーブル内への透湿
防止効果が格段に向上し、光ケーブルとしての信顛性の
向上が図れる。Table 1 (Effects of the invention) In the present invention, compared to the conventional case where a non-hygroscopic material layer such as polyethylene is provided alone as the outer sheath constituting the optical cable, the inner layer has a hygroscopic material layer. By adopting the two-layer structure provided with this, the effect of preventing moisture permeation into the optical cable is greatly improved, and the reliability of the optical cable can be improved.
■本発明のような光ケーブルの構造とすることにより、
現在の外被(シース)押出しラインで容易で製造できる
。■By using the structure of the optical cable as in the present invention,
Easy to manufacture on current sheath extrusion lines.
第1図は、本発明の無金属型光ケーブルの横断面略図を
示す。
第2図は、従来の無金属型光ケーブルの横断面略図を示
す。
1:テンションメンバ
2:光フアイバ心線
3:緩衝材
4;押え巻
5;外被(シース)
6:吸湿性材料
第1図
第2図FIG. 1 shows a schematic cross-sectional view of a metal-free optical cable of the present invention. FIG. 2 shows a schematic cross-sectional view of a conventional metal-free optical cable. 1: Tension member 2: Optical fiber core 3: Cushioning material 4; Presser winding 5; Sheath 6: Hygroscopic material Figure 1 Figure 2
Claims (4)
外被構造が少なくとも2層以上の構造からなり、しかも
その光ケーブル外被最外層に非吸湿性材料層を配し、そ
の内層に吸湿性材料層を少なくとも一層有することを特
徴とするケーブル外被を有する無金属型光ケーブル。(1) In an optical cable jacket that does not use metal, the jacket structure is composed of at least two layers, and the outermost layer of the optical cable jacket is a non-hygroscopic material layer, and the inner layer is a hygroscopic material layer. A metal-free optical cable having a cable jacket comprising at least one layer of.
酸塩、アクリル酸−アクリロニトリル共重合体である、
請求項(1)記載の無金属型光ケーブル。(2) The hygroscopic material constituting the inner layer is a polyacrylate or an acrylic acid-acrylonitrile copolymer;
The metal-free optical cable according to claim (1).
である、請求項(1)記載の無金属型光ケーブル。(3) The metal-free optical cable according to claim (1), wherein the non-hygroscopic material constituting the outer layer is polyethylene.
性材料と吸湿性材料とを同時に押出し成型することによ
り形成される、請求項(1)記載の無金属型ケーブル。(4) The metal-free cable according to claim (1), wherein the inner and outer layers constituting the optical cable jacket are formed by simultaneously extruding the non-hygroscopic material and the hygroscopic material.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63310057A JPH02157713A (en) | 1988-12-09 | 1988-12-09 | Nonmetal type optical cable |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63310057A JPH02157713A (en) | 1988-12-09 | 1988-12-09 | Nonmetal type optical cable |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH02157713A true JPH02157713A (en) | 1990-06-18 |
Family
ID=18000647
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63310057A Pending JPH02157713A (en) | 1988-12-09 | 1988-12-09 | Nonmetal type optical cable |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH02157713A (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6134512A (en) * | 1984-07-26 | 1986-02-18 | Furukawa Electric Co Ltd:The | Waterproof cable |
JPS6215510A (en) * | 1985-07-15 | 1987-01-23 | Japan Vilene Co Ltd | Running water preventing optical fiber cable |
JPS6224206A (en) * | 1985-07-25 | 1987-02-02 | Nippon Telegr & Teleph Corp <Ntt> | Waterproof optical fiber tube unit |
JPS62208507A (en) * | 1986-03-10 | 1987-09-12 | 日本電信電話株式会社 | Cable and its components and method and apparatus for manufacture of the same |
JPS62259305A (en) * | 1986-04-11 | 1987-11-11 | 凸版印刷株式会社 | Filling buffer for wire or communication cable |
-
1988
- 1988-12-09 JP JP63310057A patent/JPH02157713A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6134512A (en) * | 1984-07-26 | 1986-02-18 | Furukawa Electric Co Ltd:The | Waterproof cable |
JPS6215510A (en) * | 1985-07-15 | 1987-01-23 | Japan Vilene Co Ltd | Running water preventing optical fiber cable |
JPS6224206A (en) * | 1985-07-25 | 1987-02-02 | Nippon Telegr & Teleph Corp <Ntt> | Waterproof optical fiber tube unit |
JPS62208507A (en) * | 1986-03-10 | 1987-09-12 | 日本電信電話株式会社 | Cable and its components and method and apparatus for manufacture of the same |
JPS62259305A (en) * | 1986-04-11 | 1987-11-11 | 凸版印刷株式会社 | Filling buffer for wire or communication cable |
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