JP2005024589A - Fiber optic cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical fiber cord cable, having easy handling and having superior transmission characteristics by improving the flexibility improvement, lightweight and fine diameters, enduring tension, external pressure, impact and bends generated when being laid, wire extending, pulling-in and leading-about, and preventing displacement between the inside sheath and the outside sheath being a cause generating meanderings on the surface of the cable. <P>SOLUTION: The optical fiber cord cable vertically splices an inclusion 12 like a polypropylene yarn on an optical fiber tape ribbon group 11g, forms an intermediate layer 13 (for instance, PVC) at the periphery, and forms the outside sheath 15 of thermoplastic polyurethane, while inserting aramid fiber string 14 thereon; and the hardness of the thermoplastic polyurethane is set at 90 (HDA) or higher and the friction coefficient with respect to polyvinyl chloride is 0.2 or smaller. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００２０】
【表２】

【００２１】
【実施例３】
図３は光ファイバ８心テープ心線を６本積み重ねて光ファイバテープ心線群１１ｇとしたところが実施例２と相違し他の部分は同様である。
【００２２】
上記各実施例は、光ファイバ４心、８心テープ心線でもってテープ心線群１１ｇを構成したが、心線の数、テープ心線の数は適宜変更できる。また、テープ心線ではなく図４の単心でも適用できる。
【００２３】
なお、上記張力負荷による外被の伸び具合、ケーブルの波打ち具合、光ファイバテープ心線の断線の有無の試験は実施例２で行ったが、実施例１および実施例３でも同様の効果があることを確認している。
【００２４】
【発明の効果】
以上説明した通りこの発明によれば、▲１▼テープ心線を含む光ファイバ心線を、ポリプロピレンヤーンの如き介在物で包み緩衝層とすることにより、軽量化と細径化が可能になり、▲２▼上記外部シースに、硬度を９０（ＨＤＡ）以上とし、ポリ塩化ビニルに対する摩擦係数０．２以下の熱可塑性ポリウレタンを採用することにより、敷設、延線、引き込み、引き回しの際に生ずる引っ張り、外圧、衝撃、屈曲によく耐え、上記緩衝層にポリプロピレンヤーンを採用したことと相まって可撓性が向上し、▲３▼外部シースをアラミド繊維紐で補強することにより、敷設、延線、引き込みの際外部シースが伸び、中間層−外部シース間がずれてケーブル全体の「うねり」、伝送特性を低下、光ファイバ心線の断線を防止し、▲４▼全体として取り扱い易く、良好な伝送特性を有する光ファイバコードケーブルを得ることができるようになった。
【図面の簡単な説明】
【図１】（ａ）この発明の第一実施例の断面図
（ｂ）４心テープ心線の断面図
【図２】第二実施例の断面図
【図３】第三実施例の断面図
【図４】従来例の断面図（その１）
【図５】同（その２）
【図６】（ａ）張力負荷試験端末フック取付け説明図
（ｂ）張力負荷試験中間フック取付け説明図
【符号の説明】
１０，４０ 光ファイバコードケーブル
１１ 光ファイバテープ心線
１１ａ 光ファイバ心線
１１ｂ 一次被覆
１１ｃ 二次被覆
１１ｄ 上側の二次被覆
１１ｇ，４２ｇ 光ファイバテープ心線群
１２ ポリプロピレンヤーン
１３，４４ 中間層（ポリ塩化ビニル）
１４ アラミド繊維紐
１５，４５ 外部シース
４１ 光ファイバ心線
４３ テンションメンバ（縦添えアラミド繊維）[0001]
BACKGROUND OF THE INVENTION
This invention improves the flexibility of the optical fiber cord cable, reduces the weight and diameter, and withstands the tension, external pressure, impact, and bending that occur when laying, extending, drawing, and routing, and has good transmission characteristics. The present invention relates to an optical fiber cord cable having
[0002]
[Prior art]
The present applicant previously described in Japanese Patent Application No. 2001-332946 as an optical fiber cord cable that can withstand tensile, external pressure, impact, and bending generated during laying, drawing, drawing, and routing, and has good transmission characteristics. In the optical fiber cord cable 40 in which the optical fiber core wire 41 is protected by a tension member 43 and a protective layer is formed around the optical fiber cord 41, an aramid fiber is adopted as the tension member 43 and an intermediate layer 44 around the tension member 43. With a complete or incomplete thermoplastic polyurethane outer coating 45 formed thereon, or an optical fiber ribbon group 42g in place of the optical fiber core 41 as shown in FIG. Proposed.
[0003]
[Problems to be solved by the invention]
With the above proposal, the original purpose could be achieved, and a certain evaluation was obtained at the use site and construction site, but the cable was squeezed by pulling into a curved pipe line or routing in a curved state, or Even in a straight state, when only the sheath is pulled strongly, the outer sheath is extended, and a deviation occurs between the inner sheath and the outer sheath, and undulations appear on the cable surface, and the flexibility and bendability are biased, making it difficult to handle.
[0004]
Even if there is no misalignment between the outer sheath and the inner sheath, the sheath is stretched and the inner optical fiber is drawn into the sheath, and when the tension is released, the sheath is shrunk. If there is a risk of disconnection.
[0005]
In view of the above problems, the present invention aims to improve flexibility, reduce the weight and reduce the diameter, withstand the tension, external pressure, impact, and bending generated during laying, extending, drawing, and routing, and undulating the cable surface. It is an object of the present invention to provide an optical fiber cord cable that prevents misalignment between the inner sheath and the outer sheath and the extension of the sheath, which are caused, and is easy to handle and has good transmission characteristics.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides an optical fiber core with an inclusion vertically or twists an optical fiber and an inclusion to form an intermediate layer on the outer periphery of the thermoplastic polyurethane. An optical fiber cord cable formed with a sheath, wherein the outer sheath is reinforced with an aramid fiber cord, and the inclusion is a polypropylene yarn, and an aramid fiber cord that reinforces the outer sheath Is provided so as to bite into the inner or inner surface of the outer sheath, the thermoplastic polyurethane outer sheath has a hardness of 90 (HDA) or more, and a friction coefficient with respect to polyvinyl chloride of 0.2 or less.
[0007]
According to the present invention configured as described above, (1) it is possible to reduce the weight and diameter by wrapping the optical fiber core wire including the tape core wire with an inclusion such as polypropylene yarn as a buffer layer. (2) Forming an outer sheath of thermoplastic polyurethane through the intermediate layer, and adopting a thermoplastic polyurethane having a hardness of 90 (HDA) or more and a coefficient of friction against polyvinyl chloride of 0.2 or less as the outer sheath It can withstand the tension, external pressure, impact, and bending that occur when laying, extending, drawing, and routing, and the flexibility is improved in combination with the use of polypropylene yarn for the buffer layer. By reinforcing the sheath with an aramid fiber cord, the outer sheath stretches during laying, wire drawing, and drawing, and the intermediate layer and the outer sheath are displaced so that the entire cable is Ri "to prevent abnormal deformation such as occurs, ▲ 4 ▼ easy to handle as a whole, it is possible to obtain an optical fiber cord cable with good transmission characteristics.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0009]
[Example 1]
FIG. 1 shows that an optical fiber tape core group 11g in which 12 optical fiber 4-core ribbons 11 are stacked is vertically attached with a polypropylene yarn 12, and a polyvinyl chloride composition is extruded thereon to form an intermediate layer 13. A thermoplastic polyurethane composition in which a flame retardant, a color pigment, and the like are further blended is extruded while an aramid fiber string 14 is inserted to form an outer sheath 15. In addition, it may replace with the said polypropylene yarn and may add an aramid fiber longitudinally. Also, the optical fiber tape core group 11g and the polypropylene yarn 12 can be twisted together without being vertically attached.
[0010]
The outer sheath 15 of the thermoplastic polyurethane composition is adjusted so that its hardness is 90 (HDA) or more and the friction coefficient against polyvinyl chloride is 0.2 or less.
[0011]
The optical fiber 4-core tape core wire 11 is a combination of two-fiber tapes that can be divided into two parts. A primary coating 11b is applied to the optical fiber core wire 11a, and two of them are combined into a secondary coating. 11c, and two sets are applied together to provide the upper secondary coating 11d.
[0012]
[Example 2]
FIG. 2 shows an optical fiber tape core group 11g obtained by stacking 12 optical fiber 4-core tape cores with a polypropylene yarn 12 vertically, and a polyvinyl chloride composition is extruded thereon to form an intermediate layer 13. The outer sheath 15 is formed by extruding a thermoplastic polyurethane composition blended with a flame retardant, a color pigment and the like while an aramid fiber string 14 is added thereto.
[0013]
This embodiment is the same as the first embodiment except for the insertion position of the aramid fiber string.
[0014]
Samples of 25 m (Sample 1), 15 m (Sample 2), and 10 m (Sample 3) are taken from the prototype of Example 2 and the outer cover S is peeled off at one end of each sample as shown in FIG. The aramid fiber string T is folded back and the portion is bound B1 together with the hook F1 so that the hook F2 of the spring H is hooked.
[0015]
Further, the outer cover, the optical fiber tape core group O, the interposer K of the polypropylene yarn, the intermediate layer I, and the outer cover S are hardened with an adhesive so as not to be displaced from each other. A buffer layer C1 is formed by winding a vinyl tape or the like around the surface of the jacket S so that the wire group O is not damaged.
[0016]
Further, as shown in FIG. 6B, the binding B2 is made together with the hook F3 so as to be able to hook the hand hook F4 with an interval of 10 m from the position of the binding B1. The buffer layer C2 is formed by winding a vinyl tape or the like around the surface of the jacket S so that the optical fiber ribbon group O is not damaged during the bind B2.
[0017]
Further, samples of 25 m (sample 1), 15 m (sample 2), and 10 m (sample 3) are taken from the conventional example of FIG. 5 and processed in the same manner as above to form the terminal hook F1 and the intermediate hook F3. To do.
[0018]
The hook F2 having only the spring H is fixed to the hook F1 at one end of the samples 1 to 3 of Example 2 and the conventional example prepared as described above through the spring only H, and the hook F3 provided at a position 10 m therefrom. Hook the hand F4 to the top and apply a 20 kgf tension load for 1 minute. After removing the tension load, observe how the jacket stretches, how the cable corrugates, and whether the optical fiber ribbon is broken. The results are shown in Tables 1 and 2.
[0019]
[Table 1]

[0020]
[Table 2]

[0021]
[Example 3]
FIG. 3 differs from the second embodiment in that six optical fiber 8-core ribbons are stacked to form an optical fiber ribbon group 11g, and other parts are the same.
[0022]
Although each said Example comprised the optical fiber group 11g with the optical fiber 4 core and the 8-core tape core wire, the number of core wires and the number of tape core wires can be changed suitably. Moreover, the single core of FIG. 4 can be applied instead of the tape core wire.
[0023]
In addition, although the test of the presence or absence of the extension of the jacket by the tension load, the undulation of the cable, and the disconnection of the optical fiber tape core wire was performed in Example 2, the same effect is also obtained in Example 1 and Example 3. I have confirmed that.
[0024]
【The invention's effect】
As described above, according to the present invention, (1) the optical fiber core wire including the tape core wire is wrapped with an inclusion such as a polypropylene yarn and used as a buffer layer, thereby enabling weight reduction and diameter reduction. (2) The outer sheath has a hardness of 90 (HDA) or more and a thermoplastic polyurethane having a friction coefficient of 0.2 or less with respect to polyvinyl chloride, so that tension generated during laying, wire drawing, drawing, and routing is generated. Resistant to external pressure, impact and bending, and combined with the adoption of polypropylene yarn for the buffer layer, the flexibility is improved. (3) Reinforcement of outer sheath with aramid fiber cord, laying, drawing and drawing In this case, the outer sheath stretches, the intermediate layer and the outer sheath are displaced, and the entire cable is “swelled”, the transmission characteristics are degraded, and the optical fiber core wire is prevented from being broken. Ri easy to handle, it has become possible to obtain an optical fiber cord cable with good transmission characteristics.
[Brief description of the drawings]
1A is a cross-sectional view of a first embodiment of the present invention; FIG. 1B is a cross-sectional view of a four-core ribbon; FIG. 2 is a cross-sectional view of a second embodiment; FIG. 4 is a sectional view of a conventional example (part 1).
FIG. 5 (No. 2)
[Fig. 6] (a) Tensile load test terminal hook installation explanatory diagram (b) Tensile load test intermediate hook installation explanatory diagram [Explanation of symbols]
10, 40 Optical fiber cord cable 11 Optical fiber core wire 11a Optical fiber core wire 11b Primary coating 11c Secondary coating 11d Upper secondary coating 11g, 42g Optical fiber tape core group 12 Polypropylene yarn 13, 44 Intermediate layer (poly Vinyl chloride)
14 Aramid fiber string 15, 45 Outer sheath 41 Optical fiber core wire 43 Tension member (Aramid fiber attached vertically)

Claims (4)

In an optical fiber cord cable in which an inclusion is vertically attached to an optical fiber core or an optical fiber core and an inclusion are twisted, an intermediate layer is formed around the optical fiber, and an outer sheath of thermoplastic polyurethane is formed thereon. An optical fiber cord cable, wherein the outer sheath is reinforced with an aramid fiber string. The optical fiber cord cable according to claim 1, wherein the inclusion is a polypropylene yarn or an aramid fiber. The optical fiber cord cable according to claim 1 or 2, wherein the aramid fiber cord that reinforces the outer sheath is provided so as to bite into the inner or inner surface of the outer sheath. 4. The optical fiber cord cable according to claim 1, wherein the outer sheath of the thermoplastic polyurethane has a hardness of 90 (HDA) or more and a friction coefficient with respect to polyvinyl chloride of 0.2 or less.

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