JP2010113068A - Optical cable - Google Patents

Optical cable Download PDF

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JP2010113068A
JP2010113068A JP2008284233A JP2008284233A JP2010113068A JP 2010113068 A JP2010113068 A JP 2010113068A JP 2008284233 A JP2008284233 A JP 2008284233A JP 2008284233 A JP2008284233 A JP 2008284233A JP 2010113068 A JP2010113068 A JP 2010113068A
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slot
winding
string
twisted
optical cable
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JP4835679B2 (en
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Takeshi Takahashi
高橋  健
Ryoei Oka
涼英 岡
Takao Hirama
隆郎 平間
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Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical cable configured to easily separate and remove a loosely winding tape prepared for preventing a coated optical fiber from falling off a slot groove, on removing the tape so as to take out the optical fiber. <P>SOLUTION: The optical cable is constituted by storing the coated optical fibers 4 in the grooves 2a of the grooved slot 2 and successively disposing the loosely winding tape 5, an upper winding tape 6 and an outer cable jacket 7 on the outer periphery of the slot 2. The loosely winding tape 5 is formed of single twist yarns obtained by twisting a plurality of single synthetic resin fiber yarns, and the winding direction on the slot is the same as the twisting direction of the twisted yarns. Further, the loosely winding tape 5 is allowed to be differently-twisted yarns obtained by twisting and gathering a plurality of twisted yarns in a direction opposite to the twisting direction. Besides, it is preferable that the winding pitch of the loosely winding tape 5 is ≤60 mm, and also, it is desirable that the total of the synthetic resin fiber constituting the loosely winding tape 5 is ≥840dn. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は溝付きスロットの溝内に複数本の光ファイバ心線を収納し、スロットの外周に粗巻き紐、上巻テープ、ケーブル外被を順次施してなる光ケーブルに関する。   The present invention relates to an optical cable in which a plurality of optical fiber core wires are housed in a groove of a slot with a groove, and a rough winding string, an upper winding tape, and a cable jacket are sequentially applied to the outer periphery of the slot.

近年の映像配信、IP電話、データ通信等のブロードバンドサービスの拡大により、光ファイバによる家庭向けのデータ通信サービス(FTTH:Fiber To The Home)の加入者が増加している。このFTTHでは、架空の幹線光ケーブルからドロップ光ケーブルを用いて加入者宅等に引き落されている。加入者宅への光ファイバの引き落しは、例えば、市街の電柱等に布設された幹線光ケーブルを、通常、クロージャと称されている接続函で分岐し、分岐された光ファイバ心線にドロップ光ケーブルを融着接続又は光コネクタを用いて接続している。   With the recent expansion of broadband services such as video distribution, IP telephony, and data communications, the number of subscribers to home-use data communications services (FTTH: Fiber To The Home) using optical fibers is increasing. In this FTTH, a drop optical cable is used to drop from an imaginary trunk optical cable to a subscriber's house. For example, an optical fiber is pulled down to a subscriber's home, for example, a trunk optical cable laid on a utility pole in a city is branched by a connection box usually called a closure, and a drop optical cable is dropped on the branched optical fiber core. Are connected using fusion splicing or an optical connector.

幹線光ケーブルは、例えば、図1に示すように、SZ状に形成された複数条の溝2aを有し、中心にテンションメンバ3を埋設した樹脂製のロッドからなるスロット2(スペーサとも言う)が用いられる。スロット2の溝2aには、複数本の単心光ファイバ心線あるいは多心の光ファイバテープ心線4を収納し、ケーブル製造中にこれらがスロットの溝2aから脱落するのを防止するのに、粗巻き紐5を巻いている。そして、この粗巻き紐5の上から、上巻テープ6(押え巻とも言う)を巻き付けて、光ファイバテープ心線4を覆っている。そして、上巻テープ6の外側を、押出し成形によるケーブル外被7(シースとも言う)で被覆した形状のものが一般的である。   For example, as shown in FIG. 1, the trunk optical cable has a slot 2 (also referred to as a spacer) made of a resin rod having a plurality of grooves 2a formed in an SZ shape and having a tension member 3 embedded in the center. Used. The groove 2a of the slot 2 accommodates a plurality of single-core optical fiber cores or multi-fiber optical fiber ribbons 4 to prevent them from dropping from the slot grooves 2a during cable manufacture. The coiled wire 5 is wound. Then, an upper winding tape 6 (also referred to as a presser winding) is wound around the coarse winding 5 to cover the optical fiber ribbon 4. And the thing of the shape which coat | covered the outer side of the upper winding tape 6 with the cable jacket 7 (it is also called a sheath) by extrusion molding is common.

上述のような幹線光ケーブル1の途中部分から、光ファイバを加入者宅等に引き落すには、ケーブルに収納されている複数本の光ファイバ心線の内から、1本〜数本の光ファイバ心線を引出す分岐作業が行われる。この分岐(中間後分岐とも言われている)作業は、分岐部分のケーブル外被7を一定の長さ(50cm程度)除去する。このケーブル外被7が除去された部分では、上巻テープ6が露出されるが、この上巻テープ6をニッパ等より切裂き開始端を形成してから切断する。次いで、上巻テープ6を巻ほぐして剥ぎ取り、次いで、粗巻き紐5を切断し、内部の光ファイバテープ心線4を取り出している。   In order to draw an optical fiber from a middle part of the trunk optical cable 1 as described above to a subscriber's house or the like, one to several optical fibers are selected from a plurality of optical fiber cores housed in the cable. A branching operation for drawing the core wire is performed. In this branching (also referred to as intermediate rear branching) operation, the cable jacket 7 at the branching portion is removed by a certain length (about 50 cm). In the portion where the cable jacket 7 is removed, the upper winding tape 6 is exposed, but the upper winding tape 6 is cut after forming a tear start end with a nipper or the like. Next, the upper wound tape 6 is unwound and peeled off, and then the coarsely wound string 5 is cut and the optical fiber ribbon 4 inside is taken out.

この場合、粗巻き紐5に撚られていない繊維束が用いられていると、光ケーブルを解体、あるいは、中間分岐する際に、切断された繊維がバラけて互いに絡みあい、スロットの周りに纏わりつき、除去し難くなるという問題があった。これを改善する方法として、例えば、特許文献1には、粗巻き紐5として、撚られた繊維束を用いることが開示され、また、特許文献2には、粗巻き紐5として、伸縮可能な撚った繊維束を用い、切断された際に収縮により分離除去しやすい状態とする技術が開示されている。
特開2007−212523号公報 特開2007−226073号公報
In this case, when a fiber bundle that is not twisted around the coarse winding string 5 is used, when the optical cable is disassembled or intermediately branched, the cut fibers are separated and entangled with each other, and are wrapped around the slot. There was a problem that it became difficult to remove. As a method for improving this, for example, Patent Document 1 discloses that a twisted fiber bundle is used as the coarsely wound string 5, and Patent Document 2 discloses that the coarsely wound string 5 can be expanded and contracted. A technique is disclosed in which a twisted fiber bundle is used to make it easy to separate and remove by shrinkage when it is cut.
JP 2007-212523 A JP 2007-226073 A

しかしながら、粗巻き紐として撚られた繊維束を巻付けたとしても、繊維束の撚り方向やスロットへの巻付け方向に等によっては、切断した際の粗巻き紐がスロット上に巻付いて残り、必ずしも作業性がよくはならないことがあった。また、粗巻き紐には、合成樹脂繊維が用いられるが、その材質によっては熱収縮率が大きく、ケーブル外被の成型時の熱で収縮を起こし、スロット外面に食い込んで固着するなどで、分離が難しくなる場合がある。   However, even if a twisted fiber bundle is wound as a rough winding string, depending on the twisting direction of the fiber bundle or the winding direction of the slot, the rough winding string is cut and remains on the slot. The workability may not always be good. In addition, synthetic resin fibers are used for the coarsely wound string, but depending on the material, the heat shrinkage rate is large, causing shrinkage due to the heat during molding of the cable jacket, and biting into the outer surface of the slot to fix it. May be difficult.

また、上記の光ケーブルの中間分岐作業は、電柱上やバケット車上というような作業環境の悪い状況で行うことが多く、できるだけ簡単で短時間に行えることが要望されている。
本発明は、上述した実情に鑑みてなされたもので、スロットの溝から光ファイバ心線が脱落するのを防止する粗巻き紐を、光ファイバの取出し等のために除去する際には、スロット上から簡単に分離除去することが可能な光ケーブルの提供を目的とする。
Further, the above-mentioned intermediate branching operation of the optical cable is often performed in a poor working environment such as on a power pole or a bucket car, and it is desired to be able to be performed as easily and as quickly as possible.
The present invention has been made in view of the above-described circumstances, and when removing a rough winding string for preventing an optical fiber core wire from dropping from a groove of a slot for removing an optical fiber or the like, the slot is provided. An object of the present invention is to provide an optical cable that can be easily separated and removed from above.

本発明による光ケーブルは、溝付きスロットの溝内に光ファイバ心線を収納し、スロットの外周に粗巻き紐、上巻テープ、ケーブル外被が順次施された光ケーブルで、粗巻き紐は、合成樹脂繊維の単糸の複数本を片撚りした撚糸からなり、スロット上への巻付け方向が撚糸の撚り方向と同方向とされる。
また、粗巻き紐は、片撚りした撚糸の複数本を撚り方向と反対方向に撚り合わせた諸撚り撚糸であってもよい。また、粗巻き紐の巻付けピッチは、60mm以下とするのが好ましく、さらに、粗巻き紐の合成樹脂繊維の合計が840dn以上であることが望ましい。また、粗巻き紐の合成樹脂繊維は、ポリエステル樹脂であることが好ましい。
An optical cable according to the present invention is an optical cable in which an optical fiber core is housed in a groove of a grooved slot, and a rough winding string, an upper winding tape, and a cable jacket are sequentially provided on the outer periphery of the slot. It consists of a twisted yarn in which a plurality of single fibers are twisted, and the winding direction on the slot is the same as the twisting direction of the twisted yarn.
The coarsely wound string may be a twisted twisted yarn obtained by twisting a plurality of single twisted yarns in the direction opposite to the twisting direction. Moreover, it is preferable that the winding pitch of a rough winding string shall be 60 mm or less, and also it is desirable that the total of the synthetic resin fiber of a rough winding string is 840 dn or more. Moreover, it is preferable that the synthetic resin fiber of a rough wound string is a polyester resin.

本発明によれば、光ケーブルの解体等で、光ケーブルのスロット上に巻付けている粗巻き紐の端部を切断することにより、自然に巻付け状態が解される。このため、スロット上に巻付けられた粗巻き紐の分離除去を極めて簡単に短時間で行なうことができ、光ケーブルの中間分岐作業等を効率よく実施することが可能となる。   According to the present invention, the winding state is naturally unwound by cutting the end portion of the coarsely wound string wound around the slot of the optical cable by disassembling the optical cable or the like. For this reason, separation and removal of the coarsely wound string wound on the slot can be performed very easily in a short time, and the intermediate branching operation of the optical cable and the like can be performed efficiently.

図により本発明の実施の形態を説明する。図1(A)は本発明で対象とする光ケーブルの断面を示す図、図1(B)は光ファイバの中間分岐の作業形態を説明する図、図2(A)〜図2(C)は粗巻き紐の例を説明する図である。図中、1は光ケーブル、2はスロット、2aはスロットの溝、3はテンションメンバ、4は光ファイバ心線(テープ心線)、5は粗巻き紐、5aは合糸、5b、5b’は片撚り撚糸、5cは諸撚り撚糸、6は上巻テープ、7はケーブル外被、8は単糸を示す。   Embodiments of the present invention will be described with reference to the drawings. FIG. 1A is a diagram showing a cross section of an optical cable that is an object of the present invention, FIG. 1B is a diagram for explaining a working mode of an intermediate branch of an optical fiber, and FIGS. 2A to 2C are It is a figure explaining the example of a rough winding string. In the figure, 1 is an optical cable, 2 is a slot, 2a is a slot groove, 3 is a tension member, 4 is an optical fiber core (tape core), 5 is a coarsely wound string, 5a is a combined thread, 5b and 5b 'are One-twisted twisted yarn, 5c is various twisted-twisted yarn, 6 is an upper winding tape, 7 is a cable jacket, and 8 is a single yarn.

本発明による光ケーブル1は、図1(A)に示すように、中心にテンションメンバ(抗張力体ともいう)3を埋設一体化し、外面に複数条の溝2aを設けたプラスチック材からなるスロット(スペーサともいう)2により構成される。スロット2の溝2aは、SZ状に形成され、溝2a内には複数本の光ファイバ心線又はテープ状の光ファイバ心線4(以下、テープ心線いう)が収納される。光ケーブル1の製造過程で、テープ心線4が溝2a内に収納された後、溝2aから脱落するのを防止するために、粗巻き紐5がスロット2の外周に巻き付けられる。   As shown in FIG. 1A, an optical cable 1 according to the present invention is a slot (spacer) made of a plastic material in which a tension member (also referred to as a tensile body) 3 is embedded and integrated at the center and a plurality of grooves 2a are provided on the outer surface. (Also referred to as 2). The groove 2a of the slot 2 is formed in an SZ shape, and a plurality of optical fiber core wires or tape-shaped optical fiber core wires 4 (hereinafter referred to as tape core wires) are accommodated in the groove 2a. In the manufacturing process of the optical cable 1, after the tape core wire 4 is accommodated in the groove 2 a, the coarsely wound string 5 is wound around the outer periphery of the slot 2 in order to prevent the tape core wire 4 from falling off the groove 2 a.

粗巻き紐5が施されたスロット2の外周には、ケーブル内への止水のため、または、ケーブル外被の成形時に、成形材の熱が光ファイバ心線に悪影響を与えないように熱絶縁のための上巻テープ6が施される。この上巻テープ6は、螺旋巻きあるいは縦添えで施され、その外側をケーブル外被7で被覆して光ケーブル1とされる。なお、螺旋スロットの場合は、粗巻き紐5を用いずに上巻テープ6でテープ心線4の脱落を防止することも可能であるが、SZスロットの場合はテープ心線4を集線して溝2aに収納した後、直ちに粗巻き紐5を施す必要がある。   The outer periphery of the slot 2 to which the coarsely wound string 5 is applied is heated to prevent water from entering the cable or so that the heat of the molding material does not adversely affect the optical fiber core wire when the cable jacket is molded. An upper tape 6 for insulation is applied. The upper tape 6 is spirally wound or vertically attached, and the outside thereof is covered with a cable jacket 7 to form the optical cable 1. In the case of a spiral slot, it is possible to prevent the tape core wire 4 from falling off with the upper winding tape 6 without using the coarse winding string 5, but in the case of the SZ slot, the tape core wire 4 is concentrated to form a groove. After storing in 2a, it is necessary to apply the rough winding string 5 immediately.

上述のように構成された光ケーブル1の途中部分から、光ファイバを加入者宅等に引き落すには、光ケーブル1のスロット2の溝2aに収納されている複数本の光ファイバ心線4の内から、1本〜数本の光ファイバ心線を引出す分岐作業が行われる。この分岐作業は、例えば、光ケーブル1の分岐部分のケーブル外被7を一定の長さ(通常、50cm程度)除去する。このケーブル外被7が除去された部分では、上巻テープ6が露出されるが、この上巻テープ6をニッパ等より切裂き開始端を形成し、この開始端を始点にして切り裂く。次いで、この上巻テープ6を巻き解して剥ぎ取る。   In order to draw an optical fiber from a middle portion of the optical cable 1 configured as described above to a subscriber's house or the like, the optical fiber cores 4 accommodated in the groove 2a of the slot 2 of the optical cable 1 Then, a branching operation for drawing one to several optical fiber cores is performed. In this branching operation, for example, the cable jacket 7 at the branching portion of the optical cable 1 is removed to a certain length (usually about 50 cm). In the portion where the cable jacket 7 is removed, the upper tape 6 is exposed. The upper tape 6 is cut from a nipper or the like, and a starting end is formed. The starting end is used as a starting point. Next, the upper tape 6 is unwound and peeled off.

上巻テープ6を剥ぎ取ると、粗巻き紐5が露出されるが、露出された粗巻き紐5の端部を刃物等で切断し、その巻付けが緩んだ状態でスロット2から巻き解して除去する。粗巻き紐5を除去すると、SZ状に形成された溝2a内のテープ心線4が、溝2aから脱落して下方に垂れ下がる。この垂れ下がった部分のテープ心線4を外部に取り出し、クロージャ等の接続箱を介して、ドロップ光ケーブル等に接続する作業が行なわれる。   When the upper tape 6 is peeled off, the coarsely wound string 5 is exposed, but the exposed end of the roughly wound string 5 is cut with a blade or the like, and unwound from the slot 2 in a state where the winding is loosened. Remove. When the coarsely wound string 5 is removed, the tape core wire 4 in the groove 2a formed in the SZ shape drops from the groove 2a and hangs downward. The tape core wire 4 at the hanging portion is taken out and connected to a drop optical cable or the like through a connection box such as a closure.

図2は、上述した粗巻き紐5の例を示す図で、図2(A)は合成樹脂繊維の単糸8の複数本を単に並べたもの(以下、合糸5aという)、図2(B)は合成樹脂繊維の単糸8の複数本を一方向に撚ったもの(1次加工したもので、以下、片撚り撚糸5bという)、図3(C)は1次加工した片撚り撚糸5b’の複数本を集めて片撚り方向と反対の方向に、片撚り回数より少ないより回数で撚ったもの(2次加工したもので、以下、諸撚り撚糸5cという)の例を示す。   FIG. 2 is a diagram showing an example of the above-described coarsely wound string 5, and FIG. 2A is a diagram in which a plurality of single yarns 8 of synthetic resin fibers are simply arranged (hereinafter referred to as a combined yarn 5 a), FIG. B) is a single strand of synthetic resin fibers 8 twisted in one direction (primarily processed, hereinafter referred to as single twisted yarn 5b), and FIG. 3C is a primary processed single twist. An example is shown in which a plurality of twisted yarns 5b 'are collected and twisted in a direction opposite to the direction of single twisting with a number less than the number of times of single twisting (secondarily processed, hereinafter referred to as various twisted twisted yarns 5c). .

粗巻き紐5として、図2(A)の合糸5aを用いた場合は、スロットに巻付けられた状態で切断すると、スロット上で単糸8の繊維がバラけて互いに絡み合うため、スロットから分離除去に手間を要し、作業性が極めて悪い。粗巻き紐5として、図2(B)の片撚り撚糸5bを用いた場合は、合糸5aと比べてスロットに巻付けられた状態で切断しても、単糸8の繊維のバラけが少なく、スロット上で絡み合うことは軽減される。   When the combined yarn 5a shown in FIG. 2 (A) is used as the coarsely wound string 5, since the fibers of the single yarn 8 break apart and entangle with each other when cut in a state wound around the slot, Separation and removal are troublesome and workability is extremely poor. When the single twisted twisted yarn 5b of FIG. 2 (B) is used as the coarsely wound string 5, even if it is cut in a state of being wound around the slot as compared with the combined yarn 5a, the fiber of the single yarn 8 is less scattered. Entanglement on the slot is reduced.

しかし、片撚り撚糸5bの撚り方向と反対の方向でスロット上に巻付けると、巻付けに対して巻き戻そうとする反発力が生じない。すなわち、巻付け状態が馴染むため除去分離のため切断しても、スロット上に巻付いた状態が維持される。したがって、粗巻き紐5の露出された端部を切断した後、巻付け状態を巻き解すようにして、スロットに沿って取り除くこととなる。   However, when it is wound on the slot in a direction opposite to the twisting direction of the single twisted twisted yarn 5b, a repulsive force to unwind the winding does not occur. That is, since the winding state becomes familiar, even if it is cut for removal and separation, the state wound on the slot is maintained. Therefore, after the exposed end of the coarsely wound string 5 is cut, the wound state is unwound and removed along the slot.

図2(C)の諸撚り撚糸5cを用いた場合は、片撚り撚糸5b’の撚り方向と反対の方向(片撚り撚糸5b’の複数本を撚る方向と同じ方向)でスロット上に巻付けると、やはり、上記と同様に粗巻き紐を除去分離のため切断しても、スロット上に巻付いた状態を維持される。このため、上記と同様に、粗巻き紐5の露出された端部を切断した後、巻付け状態を巻き解すようにして、スロットに沿って取り除くこととなる。   When the plied yarn 5c of FIG. 2 (C) is used, it is wound on the slot in a direction opposite to the twist direction of the single twisted yarn 5b ′ (the same direction as the direction of twisting a plurality of single twisted yarns 5b ′). When attached, the state of being wound on the slot is maintained even if the coarsely wound string is cut for removal and separation as described above. For this reason, similarly to the above, after the exposed end portion of the coarsely wound string 5 is cut, the wound state is unwound and removed along the slot.

本発明においては、上述の点を考慮して、粗巻き紐として、合成樹脂繊維の単糸の複数本を片撚りした撚糸を用い、且つ、スロット上には片撚り撚糸の撚り方向と同じ方向で巻付ける。また、諸撚り撚糸を用いる場合も、スロット上には1次加工の片撚り撚糸の撚り方向と同じで巻付ける。この、粗巻き紐のスロット上への巻付け形態を採用することにより、解体性に優れた光ケーブルとすることができる。   In the present invention, in consideration of the above points, a twisted yarn obtained by twisting a plurality of single yarns of synthetic resin fiber is used as the coarse winding string, and the same direction as the twist direction of the single twisted yarn is provided on the slot. Wrap with. Also, when using various twisted yarns, winding is performed on the slots in the same direction as that of the primary processed single twisted yarn. By adopting this form of winding the coarsely wound string on the slot, it is possible to obtain an optical cable having excellent dismantling properties.

図3は、本発明による上記の光ケーブルの解体性を評価した結果を示す図で、図3(A)は、本発明で粗巻き紐として用いる撚糸の形状を示し、図3(B)は粗巻き紐の解体性の評価結果を示している。
なお、解体性の評価は、光ケーブルのケーブル外被と上巻テープの500mm長を除去して、スロット上に巻付けてある粗巻き紐を露出させ、露出した粗巻き紐の500mm長の両端部をニッパ等の刃物で切断し、スロット上からの分離性を評価したものである。
FIG. 3 is a diagram showing the results of evaluating the dismantling property of the optical cable according to the present invention. FIG. 3 (A) shows the shape of the twisted yarn used as the coarse winding string in the present invention, and FIG. The evaluation result of the disassembly property of the wound string is shown.
The disassembling evaluation was performed by removing the 500 mm length of the cable jacket of the optical cable and the upper winding tape, exposing the rough winding cord wound on the slot, and exposing both ends of the exposed rough winding cord of 500 mm length. It is cut with a cutter such as a nipper and the separation from the slot is evaluated.

評価用の粗巻き紐としては、合成樹脂繊維24本分に相当する250dn(デニール)の単糸を6本使用した片撚り撚糸で、図3(A−イ)に示すS撚り撚糸(No.1)と、図3(A−ロ)に示すZ撚り撚糸(No.2)との2種類を用意した。また、図3(A−ハ)に示すような、上記と同じ単糸の2本をZ撚りした撚糸の3本をS撚りした諸撚り撚糸(No.3)と、単糸の2本をS撚りした撚糸の3本をZ撚りした諸撚り撚糸(No.4)との2種類を用意した。   As a rough winding string for evaluation, a single twisted twisted yarn using six 250 dn (denier) single yarns corresponding to 24 synthetic resin fibers, an S twisted twisted yarn (No. 1) and two types of Z-twisted yarn (No. 2) shown in FIG. 3 (A-B) were prepared. Further, as shown in FIG. 3 (A-C), two twisted yarns (No. 3) obtained by S-twisting three twisted yarns obtained by Z-twisting two of the same single yarns as described above, and two single yarns. Two types of three twisted yarns (No. 4) in which three S twisted yarns were Z twisted were prepared.

そして、片撚り撚糸の2種類については、撚りピッチ80回/mで撚り(1次加工)、諸撚り撚糸の2種類については、片撚りの撚りピッチ160回/mで撚った後(1次加工)、諸撚りを撚りピッチピッチ80回/mで撚った(2次加工)。スロットは外径の異なる3種(スロット径6.0,9.0,12.0mm)を対象に、スロット直上には、4種の巻付けピッチ(20,40,60,80mm)で、各種類で撚糸の片撚り方向と同じ方向と反対の方向に巻付けて評価した。   And about two types of single twisted yarn, after twisting at a twist pitch of 80 times / m (primary processing), and about two types of twisted yarns, after twisting at a single twisted twist pitch of 160 times / m (1 Next processing), various twists were twisted and twisted at a pitch pitch of 80 times / m (secondary processing). The slot has three types with different outer diameters (slot diameter 6.0, 9.0, 12.0 mm), and immediately above the slot, there are four types of winding pitches (20, 40, 60, 80 mm). It was evaluated by winding in the direction opposite to the same direction as the single twist direction of the twisted yarn.

評価結果は、図3(B)に示すように、撚糸を用いることで、いずれの場合も樹脂繊維がバラけることはなかった。しかし、No.1およびNo.2の片撚り撚糸の例で示すように、片撚りの撚り方向がS撚りの場合は、スロット上への巻付け方向は同じS方向に巻付けた方が、片撚りの撚り方向がZ撚りの場合は、スロット上への巻付け方向は同じZ方向に巻付けた方が、解体性はベター(◎)であった。No.3およびNo.4の諸撚り撚糸の例においても、1次加工の片撚り撚糸の撚り方向と同じ方向でスロット上に巻付けた方が、解体性はベター(◎)であった。   As shown in FIG. 3 (B), the evaluation results showed that the resin fibers did not fall apart in any case by using twisted yarn. However, as shown in the examples of the No. 1 and No. 2 single twisted twisted yarns, when the twisting direction of the single twist is S twisting, the winding direction on the slot is wound in the same S direction, When the twist direction of the single twist was the Z twist, the disassembly was better (ベ) when the winding direction on the slot was the same Z direction. Also in the examples of the No. 3 and No. 4 twisted twisted yarns, the dismantling property was better (◎) when wound on the slot in the same direction as the twist direction of the primary processed single twisted yarn.

なお、解体性がベターとは、粗巻き紐の両端を切断したとき、巻付けから解放された撚糸が、巻付けがS方向であったものがZ方向の巻き癖になるように変形して大幅に緩み、極めて分離しやすくなる状態をいう。これに対し、片撚り撚糸の撚り方向と反対の方向で巻付けた場合は、粗巻き紐の両端を切断したときに、多少の緩みは生じるものの、巻付け状態を維持していて、手で巻き解してやる必要がある状態である。   Better dismantling means that when both ends of the coarse wound string are cut, the twisted yarn released from the winding is deformed so that the winding in the S direction becomes a winding in the Z direction. It is a state where it is greatly loosened and extremely easy to separate. On the other hand, when wound in the direction opposite to the twist direction of the single twisted twisted yarn, when the ends of the coarsely wound string are cut, some looseness occurs, but the wound state is maintained, and It is a state that needs to be unwound.

これは、撚糸とすることで、撚り方向と反対の方向に撚りを戻そうとする反発力が残存していることによるものと想定される。例えば、S撚りで片撚りされている撚糸は、Z方向に撚りが戻ろうとする反発力が発生している。そこで、S撚りの撚糸をスロットにS方向で巻付けると、S撚りによる反発力が残存すると共に増強される形態となるため、巻付けを解放すると、その反発力が働いて自然と巻付けが解かれる。   This is presumably due to the fact that the repulsive force that tries to return the twist in the direction opposite to the twist direction remains by using the twisted yarn. For example, a twisted yarn that has been single-twisted by S twisting has a repulsive force that causes the twist to return in the Z direction. Therefore, when the S twisted yarn is wound around the slot in the S direction, the repulsive force due to the S twist remains and is strengthened, so when the winding is released, the repulsive force works and the winding is naturally performed. It will be solved.

一方、S撚りの撚糸をスロットにZ方向で巻付けると、反発力を解消する形態となるため、スロットへの巻付けが馴染んで、巻付けを解放しても、自然と巻付けが解かれることはなく、スロットに巻付いた状態のままとなる。なお、諸撚り撚糸の場合は、1次加工の撚りが2次加工によるものより大きいため、1次加工の撚り方向で左右される。   On the other hand, when the S-twisted twisted yarn is wound around the slot in the Z direction, the repulsive force is eliminated, so that the winding around the slot is familiar, and even when the winding is released, the winding is naturally released. There is nothing, and it remains in the state wound around the slot. In the case of various twisted yarns, the primary processing twist is greater than that of the secondary processing, and therefore depends on the primary processing twist direction.

なお、撚糸の撚りピッチについては、上述の反発力を高める上では高ピッチとするのが好ましい。しかし、ケーブル外被の肉厚や、粗巻き紐の繊度によっては、ケーブル外被に螺旋状の筋が浮き出ることもあり、図3(B)で示したような程度のピッチとするのが望ましい。   In addition, about the twist pitch of a twisted thread, it is preferable to make it high pitch, when raising the above-mentioned repulsive force. However, depending on the thickness of the cable jacket and the fineness of the coarsely wound string, spiral streaks may be raised on the cable jacket, and it is desirable to set the pitch as shown in FIG. .

また、粗巻き紐のスロット上への巻付けピッチについては、ピッチが長くなるほど反発力は弱くなる。巻付けピッチが60mmを超えると反発力は、実質的はなくなり、上記のように自然にスロットへの巻付けが解かれるというような解体性は期待することができない。したがって、粗巻き紐の巻付けピッチは60mm未満とするのが望ましい。   Moreover, about the winding pitch on the slot of a rough winding string, repulsive force becomes weak, so that a pitch becomes long. When the winding pitch exceeds 60 mm, the repulsive force substantially disappears, and it is not possible to expect the dismantling property that the winding around the slot is naturally released as described above. Therefore, it is desirable that the winding pitch of the coarsely wound string is less than 60 mm.

撚糸のサイズについては、粗巻き紐として機能、ケーブル外被の外観を考慮すると、小さい方が好ましい。しかし、このサイズをあまり小さくすると、上述した反発力が低下し、粗巻き紐の解体性の向上は難しくなる。したがって、撚糸のサイズとしては、粗巻き紐全体として、840dn(デニール)以上とするのが望ましい。なお、図3では、250dn×6で評価したものを示したが、250dn×5(片撚り)の場合も同様な好ましい結果であった。   The size of the twisted yarn is preferably smaller in consideration of the function as a rough winding string and the appearance of the cable jacket. However, if this size is made too small, the repulsive force described above will decrease, and it will be difficult to improve the dismantling of the coarsely wound string. Accordingly, it is desirable that the size of the twisted yarn is 840 dn (denier) or more for the entire coarsely wound string. In addition, although what was evaluated by 250 dnx6 was shown in FIG. 3, the same preferable result was also obtained in the case of 250 dnx5 (single twist).

また、上記の粗巻き紐には、通常、ナイロン繊維を用いることが多いが、ケーブル外被の肉厚が1.5mm以上の場合は、スロット表面に固着されることがある。これは、ケーブル外被の肉厚が厚ければ厚いほど、その成型時のケーブル外被の温度は、高温になりやすい。このため、例えば、ケーブル外被厚2.0mmの成型時の温度が200℃前後とすると、この温度は上巻テープを経て粗巻き紐まで伝わり、粗巻き紐の温度は140℃程度となる。   In addition, nylon fibers are usually used for the above-mentioned rough winding string, but when the thickness of the cable jacket is 1.5 mm or more, it may be fixed to the slot surface. The thicker the cable jacket, the higher the temperature of the cable jacket at the time of molding. For this reason, for example, if the temperature at the time of forming the cable jacket thickness of 2.0 mm is around 200 ° C., this temperature is transmitted to the coarse winding string through the upper winding tape, and the temperature of the coarse winding string is about 140 ° C.

粗巻き紐の温度がこの程度の高温になると、粗巻き紐は巻付け径の中心側に向かって収縮し、さらには軟化することで、その樹脂繊維がスロット表面に食い込んで固着することがある。粗巻き紐がスロットに固着すると、その解体性は著しく低下する。そこで、粗巻き紐としての要求特性としては、強度、伸度は従来程度に確保して、軟化温度が高く、収縮率の小さい樹脂繊維材料が望まれる。   When the temperature of the coarsely wound string becomes such a high temperature, the coarsely wound string contracts toward the center side of the winding diameter, and further softens, so that the resin fiber may bite into the slot surface and be fixed. . When the coarsely wound string is fixed to the slot, the dismantling property is remarkably lowered. Therefore, as the required properties for the coarsely wound string, a resin fiber material is desired which has a strength and elongation as high as those of the conventional one, a high softening temperature, and a low shrinkage rate.

図4は、ナイロン樹脂製の紐とポリエステル樹脂製の紐の性能を比較した図である。これによれば、ポリエステル樹脂製の紐は、強度、伸度では大きな差はないが、180℃における収縮率で、ナイロン樹脂製の紐の11%と比べて、4%と小さい。また、ナイロン樹脂製の紐は、融点215℃、軟化点180℃に対して、ポリエステル樹脂製の紐は、融点260℃、軟化点240℃である。したがって、ケーブル外被の肉厚が1.5mm以上の厚さを要する場合は、粗巻き紐はポリエステル樹脂製とするのが好ましい。   FIG. 4 is a diagram comparing the performance of nylon resin strings and polyester resin strings. According to this, the polyester resin string has no significant difference in strength and elongation, but the shrinkage at 180 ° C. is 4% smaller than 11% of the nylon resin string. The nylon resin string has a melting point of 215 ° C. and a softening point of 180 ° C., whereas the polyester resin string has a melting point of 260 ° C. and a softening point of 240 ° C. Therefore, when the thickness of the cable jacket requires a thickness of 1.5 mm or more, it is preferable that the rough winding string is made of polyester resin.

本発明による光ケーブルの概略を説明する図である。It is a figure explaining the outline of the optical cable by this invention. 光ケーブルで用いられる粗巻き紐の形状を説明する図である。It is a figure explaining the shape of the rough winding string used with an optical cable. 本発明による粗巻き紐の解体性の評価結果を示す図である。It is a figure which shows the evaluation result of the disassembly property of the rough winding string by this invention. 粗巻き紐の状態を示す図である。It is a figure which shows the state of a rough winding string.

符号の説明Explanation of symbols

1…光ケーブル、2…スロット、2a…スロットの溝、3…テンションメンバ、4…光ファイバ心線(テープ心線)、5…粗巻き紐、5a…合糸、5b,5b’…片撚り撚糸、5c…諸撚り撚糸、6…上巻テープ、7…ケーブル外被、8…単糸。 DESCRIPTION OF SYMBOLS 1 ... Optical cable, 2 ... Slot, 2a ... Slot groove, 3 ... Tension member, 4 ... Optical fiber core wire (tape core wire), 5 ... Coarse winding string, 5a ... Combined yarn, 5b, 5b '... Single twisted yarn 5c ... twisted yarns, 6 ... top wound tape, 7 ... cable jacket, 8 ... single yarn.

Claims (5)

溝付きスロットの溝内に光ファイバ心線を収納し、前記スロットの外周に粗巻き紐、上巻きテープ、ケーブル外被が順次施された光ケーブルであって、
前記粗巻き紐は、合成樹脂繊維の単糸の複数本を片撚りした撚糸からなり、前記スロット上への巻付け方向が前記撚糸の撚り方向と同方向であることを特徴とする光ケーブル。
An optical cable in which an optical fiber core is housed in a groove of a slot with a groove, and a rough winding string, an upper winding tape, and a cable jacket are sequentially applied to the outer periphery of the slot,
The optically wound cable is characterized in that the coarsely wound string is made of a twisted yarn obtained by twisting a plurality of single yarns of synthetic resin fiber, and the winding direction on the slot is the same as the twisting direction of the twisted yarn.
前記粗巻き紐が、片撚りした撚糸の複数本を撚り方向と反対方向に撚り合わせた諸撚り撚糸であることを特徴とする請求項1に記載の光ケーブル。   2. The optical cable according to claim 1, wherein the coarsely wound string is a plied twisted yarn obtained by twisting a plurality of single-twisted twisted yarns in a direction opposite to the twisting direction. 前記粗巻き紐の巻付けピッチが、60mm以下であることを特徴とする請求項1または2に記載の光ケーブル。   The optical cable according to claim 1 or 2, wherein a winding pitch of the rough winding string is 60 mm or less. 前記粗巻き紐の合成樹脂繊維の合計が、840dn以上であることを特徴とする請求項1〜3のいずれか1項に記載の光ケーブル。   4. The optical cable according to claim 1, wherein a total of the synthetic resin fibers of the coarsely wound string is 840 dn or more. 前記粗巻き紐の合成樹脂繊維は、ポリエステル樹脂で形成されていることを特徴とする請求項1〜4のいずれか1項に記載の光ケーブル。   The optical cable according to any one of claims 1 to 4, wherein the synthetic resin fiber of the coarsely wound string is formed of a polyester resin.
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JPH05106126A (en) * 1991-10-11 1993-04-27 Kataoka Eng Kk Composite twister
JPH11218653A (en) * 1998-02-03 1999-08-10 Fujikura Ltd Multi fiber optical cable
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JP2007212523A (en) * 2006-02-07 2007-08-23 Sumitomo Electric Ind Ltd Optical cable
JP2007226073A (en) * 2006-02-27 2007-09-06 Sumitomo Electric Ind Ltd Optical cable
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61191481A (en) * 1985-02-20 1986-08-26 本田技研工業株式会社 Main stand device for two-wheel barrow
JPH05106126A (en) * 1991-10-11 1993-04-27 Kataoka Eng Kk Composite twister
JPH11218653A (en) * 1998-02-03 1999-08-10 Fujikura Ltd Multi fiber optical cable
JP2004287223A (en) * 2003-03-24 2004-10-14 Showa Electric Wire & Cable Co Ltd Fiber optic cable
JP2006316357A (en) * 2005-05-10 2006-11-24 Toray Ind Inc Saxony twisted crimped yarn and cut pile carpet
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