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JP6983214B2 - Optical cable - Google Patents
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JP6983214B2 - Optical cable - Google Patents

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JP6983214B2
JP6983214B2 JP2019238232A JP2019238232A JP6983214B2 JP 6983214 B2 JP6983214 B2 JP 6983214B2 JP 2019238232 A JP2019238232 A JP 2019238232A JP 2019238232 A JP2019238232 A JP 2019238232A JP 6983214 B2 JP6983214 B2 JP 6983214B2
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optical
tensile strength
sheath
optical cable
cord
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賢吾 田邉
仁志 斉藤
純哉 蓮沼
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SWCC Corp
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SWCC Showa Cable Systems Co Ltd
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Description

本発明は光ケーブルに関する。 The present invention relates to an optical cable.

高速通信サービスの開始に伴って、携帯電話の無線基地局として、マクロセルよりも通信エリアが狭い「スモールセル」が設置されている。
スモールセルは、利用者が多い場所(駅や商業施設などの繁華街)や電波が届きにくい場所(地下街など)において、通信品質の劣化を抑制するために設置されている。スモールセルは、ビル街、地下街、ビル内部などの場所に設置されるナノセルおよびピコセルを含むと共に、店舗、事務所、一般家庭などの場所に設置されるフェムトセルを含む。
With the start of high-speed communication services, "small cells", which have a narrower communication area than macro cells, have been installed as wireless base stations for mobile phones.
Small cells are installed in places where there are many users (business districts such as stations and commercial facilities) and places where radio waves are difficult to reach (underground shopping malls, etc.) in order to suppress deterioration of communication quality. Small cells include nanocells and picocells installed in places such as building streets, underground malls, and inside buildings, as well as femtocells installed in places such as stores, offices, and ordinary households.

スモールセルの配線作業においては配線スペースに一定の制限があるためフレキシブル性が要求され、ディストリビューション型の光ケーブルが使用される。
たとえば特許文献1の光ケーブルでは、シースの収縮と抗張力繊維の収縮(抗張力繊維の引張伸び特性)とのバランスを考慮し、フレキシブル性を付与している。
In the wiring work of small cells, flexibility is required because the wiring space is limited, and distribution type optical cables are used.
For example, in the optical cable of Patent Document 1, flexibility is imparted in consideration of the balance between the shrinkage of the sheath and the shrinkage of the tensile strength fiber (tensile elongation characteristic of the tensile strength fiber).

特開2008−015414号公報Japanese Unexamined Patent Publication No. 2008-05414

しかしながら、特許文献1の光ケーブルでは上記のとおり、シースの収縮と抗張力繊維の引張伸び特性との2つの要素に基づきフレキシブル性だけに着目しており、フレキシブル性以外の特性、たとえばケーブル端末ではシースを引き裂き光ファイバ心線を口出しする必要がありその特性(口出し性)などは検討されていない。
したがって本発明の主な目的は、フレキシブル性と口出し性との両特性を有する光ケーブルを提供することにある。
However, as described above, the optical cable of Patent Document 1 focuses only on flexibility based on the two factors of the shrinkage of the sheath and the tensile elongation characteristic of the tensile strength fiber, and the sheath is used for characteristics other than flexibility, for example, in a cable terminal. It is necessary to squeeze out the torn optical fiber core wire, and its characteristics (slip-out property) have not been investigated.
Therefore, a main object of the present invention is to provide an optical cable having both flexibility and mouth-to-mouth characteristics.

上記課題を解決するため本発明によれば、
光コードおよびシースがこの順に設置された光ケーブルであって、
前記光コードと前記シースとの間には抗張力繊維が充填され、
前記抗張力繊維の密度が17,182〜24,992dtex/mmであり、
前記光コードの長さ2mにおける引き抜き力が10〜20Nであることを特徴とする光
ケーブルが提供される。
According to the present invention in order to solve the above problems.
An optical cable in which the optical cord and sheath are installed in this order.
A tensile strength fiber is filled between the optical cord and the sheath.
The density of the tensile strength fiber is 17,182 to 24,992 dtex / mm 2 .
Provided is an optical cable characterized in that the pulling force at a length of 2 m of the optical cord is 10 to 20 N.

本発明によれば、抗張力繊維の密度と光コードの引き抜き力とが考慮されており、フレキシブル性と口出し性との両特性を有する光ケーブルを提供することができる。 According to the present invention, the density of the tensile strength fiber and the pulling force of the optical cord are taken into consideration, and it is possible to provide an optical cable having both flexibility and mouth-out property.

光ケーブルの概略構成を示す断面図である。It is sectional drawing which shows the schematic structure of an optical cable.

以下、本発明の好ましい実施形態にかかる光ケーブルについて説明する。なお、本明細書では、数値範囲を示す「〜」の記載に関し下限値および上限値はその数値範囲に含まれる。 Hereinafter, the optical cable according to the preferred embodiment of the present invention will be described. In this specification, the lower limit value and the upper limit value are included in the numerical range with respect to the description of "~" indicating the numerical range.

[光ケーブル]
図1は光ケーブル1の概略構成を示す断面図である。
図1に示すとおり、光ケーブル1は光ファイバ心線2、抗張力繊維3、光コード外被4(これら部材で光コード5が構成される。)およびシース6を有しており、光コード5とシース6との間に抗張力繊維12が充填された構成を有している。
[Optical cable]
FIG. 1 is a cross-sectional view showing a schematic configuration of an optical cable 1.
As shown in FIG. 1, the optical cable 1 has an optical fiber core wire 2, a tensile strength fiber 3, an optical cord outer cover 4 (the optical cord 5 is composed of these members), and a sheath 6, and the optical cord 5 and the optical cord 5 are provided. It has a structure in which the tensile strength fiber 12 is filled between the sheath 6 and the sheath 6.

光ファイバ心線2は光ファイバ(図示省略)に1次被覆(図示省略)と2次被覆(図示省略)とを順次設けることで構成されている。光ファイバはコアおよびクラッドが石英ガラスで形成されている。1次被覆は紫外線硬化樹脂で形成され、2次被覆は熱可塑性樹脂で形成されている。 The optical fiber core wire 2 is configured by sequentially providing a primary coating (not shown) and a secondary coating (not shown) on an optical fiber (not shown). The core and clad of the optical fiber are made of quartz glass. The primary coating is made of UV curable resin and the secondary coating is made of thermoplastic resin.

光コード外被4およびシース6はともに、難燃性(JIS C3521準拠の試験で燃焼しない)のポリエチレンから構成されており、光ファイバ心線2を2重に被覆し保護している。難燃性ポリエチレンには水酸化マグネシウムや水酸化アルミニウムのような金属水酸化物が含有され、その脱水吸熱反応の作用によって自己消化性の効果が発揮される。
光コード外被4とシース6とで、シース6は光コード外被4よりも厚さが大きく、シース6の厚さは好ましくは0.8〜1.2mm程度であり、光コード外被4の厚さは好ましくは0.17〜0.23mm程度である。
Both the optical cord outer cover 4 and the sheath 6 are made of flame-retardant polyethylene (which does not burn in a JIS C3521 compliant test), and doubly coat and protect the optical fiber core wire 2. Flame-retardant polyethylene contains metal hydroxides such as magnesium hydroxide and aluminum hydroxide, and its self-digesting effect is exhibited by the action of its dehydration endothermic reaction.
With the optical cord outer cover 4 and the sheath 6, the sheath 6 is thicker than the optical cord outer cover 4, and the thickness of the sheath 6 is preferably about 0.8 to 1.2 mm, and the optical cord outer cover 4 is used. The thickness of is preferably about 0.17 to 0.23 mm.

抗張力繊維3、12は光ファイバ心線2を補強する補強線として設けられており、側圧などの外力が光ケーブル1に加えられたときに、光ファイバ心線2に加わる衝撃を緩和するクッションとして機能し光ファイバ心線2を保護するようになっている。
内側の抗張力繊維3は多数のアラミド繊維が束ねられた繊維体であって、光ファイバ心線2に対し縦添えされ光コード外被4で被覆されている。
外側の抗張力繊維12も多数のアラミド繊維が束ねられた繊維体であって、光コード外被4に対し縦添えされシース6で被覆されている。
特に内側の抗張力繊維3と外側の抗張力繊維12とで、外側の抗張力繊維12は内側の抗張力繊維3よりも繊度(密度)が高く、外側の抗張力繊維12の密度は17,000〜25,000dtex/mmであり、好ましくは17,182〜24,992dtex/mmであり、内側の抗張力繊維3の密度は好ましくは3,400〜4,200dtex/mmである。
The tensile strength fibers 3 and 12 are provided as reinforcing wires to reinforce the optical fiber core wire 2, and function as a cushion to alleviate the impact applied to the optical fiber core wire 2 when an external force such as lateral pressure is applied to the optical cable 1. The optical fiber core wire 2 is protected.
The inner tensile strength fiber 3 is a fiber body in which a large number of aramid fibers are bundled, and is vertically attached to the optical fiber core wire 2 and covered with an optical cord outer cover 4.
The outer tensile strength fiber 12 is also a fiber body in which a large number of aramid fibers are bundled, and is vertically attached to the optical cord outer cover 4 and coated with a sheath 6.
Especially in the inner tensile strength fiber 3 and the outer tensile strength fiber 12, the outer tensile strength fiber 12 has a higher fineness (density) than the inner tensile strength fiber 3, and the outer tensile strength fiber 12 has a density of 17,000 to 25,000 dtex. It is / mm 2 , preferably 17,182 to 24,992 dtex / mm 2 , and the density of the inner tensile strength fibers 3 is preferably 3,400 to 4,200 dtex / mm 2 .

以上の光ケーブル1では、光コード5の長さ2mにおける引き抜き力が10〜20Nである。当該「引き抜き力」とは、引き抜き力試験を用いて測定される測定値であって、光コード5が長さ2mの光ケーブル1から動き始めるのに必要な力(N)を測定し取得した値である。 In the above optical cable 1, the pulling force of the optical cord 5 at a length of 2 m is 10 to 20 N. The "pulling force" is a measured value measured by using a pulling force test, and is a value obtained by measuring the force (N) required for the optical cord 5 to start moving from the optical cable 1 having a length of 2 m. Is.

[光ケーブルの製造方法]
光ファイバ心線2に対し内側の抗張力繊維3を縦添えし被覆し、その外周に対し一定のダイスを使用して難燃性ポリエチレンを押し出し被覆し光コード外被4(光コード5)を形成する。
その後、光コード5に対し外側の抗張力繊維12を縦添えし被覆し、その外周に対し一定のダイスを使用して難燃性ポリエチレンを押し出し被覆しシース6を形成する。
[Manufacturing method of optical cable]
The inner tensile strength fiber 3 is vertically attached to the optical fiber core wire 2 and coated, and the outer periphery thereof is extruded and coated with flame-retardant polyethylene using a constant die to form an optical cord outer cover 4 (optical cord 5). do.
After that, the outer tensile strength fiber 12 is vertically attached to the optical cord 5 and coated, and the outer periphery thereof is extruded and coated with flame-retardant polyethylene using a constant die to form the sheath 6.

以上の光ケーブル1によれば、外側の抗張力繊維12の密度と光コード5の引き抜き力とが考慮されており、フレキシブル性と口出し性との両特性を有する(下記実施例参照)。 According to the above optical cable 1, the density of the outer tensile strength fiber 12 and the pulling force of the optical cord 5 are taken into consideration, and the optical cable 1 has both flexibility and mouth-out property (see the following examples).

(1)サンプルの作製
光ファイバ心線に対し3条のアラミド繊維(4,000dtex/mm程度)を縦添えし被覆し、その外周に対し一定のダイスを使用して難燃性ポリエチレンを押し出し被覆し、厚さ0.20mmの光コード外被を有する光コードを形成した。
その後、光コードに対し6条のアラミド繊維を縦添えし被覆し、その外周に対し一定のダイスを使用して難燃性ポリエチレンを押し出し被覆し厚さ1.0mmのシースを形成した。
ここでは、外側のアラミド繊維自体の密度を変動させ、表1のサンプル1〜7を作製した。
(1) Preparation of sample Three aramid fibers ( about 4,000 dtex / mm 2 ) are vertically attached to the optical fiber core wire to cover it, and flame-retardant polyethylene is extruded from the outer circumference using a constant die. It was coated to form an optical cord with a 0.20 mm thick optical cord jacket.
Then, 6 aramid fibers were vertically attached to the optical cord and coated, and the outer periphery thereof was extruded and coated with flame-retardant polyethylene using a constant die to form a sheath having a thickness of 1.0 mm.
Here, the densities of the outer aramid fibers themselves were varied to prepare Samples 1 to 7 in Table 1.

(2)サンプルの評価
(2.1)引き抜き力の測定
光コードが、長さ2mのサンプル(光ケーブル)から動き始めるのに必要な力(N)を測定した。
(2) Sample evaluation (2.1) Measurement of pull-out force The force (N) required for the optical cord to start moving from a sample (optical cable) with a length of 2 m was measured.

(2.2)配線作業性
フレキシブル性の一指標として配線作業性を評価した。
具体的には、各サンプルでφ40mmのループ(輪)を作り、100mm/分の速さでその両端を引っ張ったときに、キンクが発生するかどうかを確認した(JIS C 6870-1-21 光ファイバケーブル特性試験方法を参考とした。)。キンクが発生しなければ「〇(合格)」と、キンクが発生すれば「×(不合格)」と判定した。
(2.2) Wiring workability Wiring workability was evaluated as an index of flexibility.
Specifically, we made a loop (ring) of φ40 mm for each sample and checked whether kink occurred when both ends were pulled at a speed of 100 mm / min (JIS C 6870-1-21 optical fiber). The fiber cable characteristic test method was used as a reference.) If no kink occurred, it was judged as "○ (pass)", and if kink occurred, it was judged as "x (fail)".

(2.3)口出し性
各サンプルの端末から長さ3mの位置に切り込みを入れ、シースを引き裂き除去したときに、光コードの移動がないかどうかを確認した。光コードの移動がなければ「〇(合格)」と、光コードの移動があれば「×(不合格)」と判定した。
(2.3) Mouth-out property A notch was made at a position 3 m in length from the terminal of each sample, and it was confirmed whether or not the optical cord moved when the sheath was torn and removed. If there was no movement of the optical code, it was judged as "○ (pass)", and if there was movement of the optical code, it was judged as "x (failure)".

Figure 0006983214
Figure 0006983214

(3)まとめ
表1に示すとおり、サンプル1、2では、外側の抗張力繊維の密度や光コードの引き抜き力が過小で、配線作業性の評価においてキンクが発生した。逆にサンプル6、7では、外側の抗張力繊維の密度や光コードの引き抜き力が過大で、口出し性の評価においてシースの除去時に光コードの移動が認められた。これに対し、サンプル3〜5はサンプル1〜2、6〜7と比較し配線作業性と口出し性との両方で優れており、外側の抗張力繊維の密度と光コードの引き抜き力とを調整することでこれら両特性を満足しうることがわかる。
(3) Summary As shown in Table 1, in Samples 1 and 2, the density of the outer tensile strength fibers and the pulling force of the optical cord were too small, and kink occurred in the evaluation of wiring workability. On the contrary, in Samples 6 and 7, the density of the outer tensile strength fibers and the pulling force of the optical cord were excessive, and in the evaluation of the mouth-out property, the optical cord moved when the sheath was removed. On the other hand, Samples 3 to 5 are superior to Samples 1 to 2 and 6 to 7 in terms of both wiring workability and mouth-outability, and adjust the density of the outer tensile strength fibers and the pulling force of the optical cord. It can be seen that both of these characteristics can be satisfied.

1 光ケーブル
2 光ファイバ心線
3 (内側の)抗張力繊維
4 光コード外被
5 光コード
6 シース
12 (外側の)抗張力繊維
1 Optical cable 2 Optical fiber core wire 3 (Inner) tensile strength fiber 4 Optical cord outer cover 5 Optical cord 6 Sheath 12 (Outer) tensile strength fiber

Claims (1)

光コードおよびシースがこの順に設置された光ケーブルであって、
前記光コードと前記シースとの間には抗張力繊維が充填され、
前記抗張力繊維の密度が17,182〜24,992dtex/mmであり、
前記光コードの長さ2mにおける引き抜き力が10〜20Nであることを特徴とする光
ケーブル。
An optical cable in which the optical cord and sheath are installed in this order.
A tensile strength fiber is filled between the optical cord and the sheath.
The density of the tensile strength fiber is 17,182 to 24,992 dtex / mm 2 .
An optical cable having a pulling force of 10 to 20 N at a length of 2 m of the optical cord.
JP2019238232A 2019-12-27 2019-12-27 Optical cable Active JP6983214B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61153611A (en) * 1984-12-26 1986-07-12 Toyobo Co Ltd Flexible tensile wire
JPH09120023A (en) * 1995-10-25 1997-05-06 Furukawa Electric Co Ltd:The Single core optical fiber cord
JP3773591B2 (en) * 1996-06-20 2006-05-10 古河電気工業株式会社 Single fiber optic cord
JP3017974B2 (en) * 1997-10-09 2000-03-13 住友電気工業株式会社 Optical fiber cord
JP2004117675A (en) * 2002-09-25 2004-04-15 Sumitomo Electric Ind Ltd Fiber optic cable
WO2004107004A1 (en) * 2003-05-27 2004-12-09 Asahi Glass Company, Limited Optical fiber cable and method of producing the same
JP2010139631A (en) * 2008-12-10 2010-06-24 Furukawa Electric Co Ltd:The Optical fiber cable
US8879877B2 (en) * 2010-06-01 2014-11-04 Nexans Fiber optic cable for cordage or tactical applications
US8705921B2 (en) * 2012-07-27 2014-04-22 Corning Cable Systems Llc Fiber optic drop cable

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