JPH04284409A - Central structural body for optical fiber cable - Google Patents
Central structural body for optical fiber cableInfo
- Publication number
- JPH04284409A JPH04284409A JP3074746A JP7474691A JPH04284409A JP H04284409 A JPH04284409 A JP H04284409A JP 3074746 A JP3074746 A JP 3074746A JP 7474691 A JP7474691 A JP 7474691A JP H04284409 A JPH04284409 A JP H04284409A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- heat
- reinforced plastic
- optical fiber
- fiber cable
- 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
- 239000013307 optical fiber Substances 0.000 title claims description 28
- 239000011151 fibre-reinforced plastic Substances 0.000 claims abstract description 18
- 230000002093 peripheral effect Effects 0.000 claims abstract 2
- 239000010410 layer Substances 0.000 claims description 51
- 229920005989 resin Polymers 0.000 claims description 40
- 239000011347 resin Substances 0.000 claims description 40
- 239000012790 adhesive layer Substances 0.000 claims description 21
- 239000002990 reinforced plastic Substances 0.000 claims description 19
- 229920005992 thermoplastic resin Polymers 0.000 claims description 16
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 10
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 9
- 229920006231 aramid fiber Polymers 0.000 claims description 8
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 abstract description 19
- 239000004760 aramid Substances 0.000 abstract description 17
- 229920000573 polyethylene Polymers 0.000 abstract description 16
- 229920002430 Fibre-reinforced plastic Polymers 0.000 abstract description 15
- 229920003235 aromatic polyamide Polymers 0.000 abstract description 15
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 abstract 3
- 239000005977 Ethylene Substances 0.000 abstract 3
- 229920001577 copolymer Polymers 0.000 abstract 3
- -1 polyethylene Polymers 0.000 description 17
- 239000000463 material Substances 0.000 description 9
- 238000001125 extrusion Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 229920001903 high density polyethylene Polymers 0.000 description 4
- 239000004700 high-density polyethylene Substances 0.000 description 4
- 239000012783 reinforcing fiber Substances 0.000 description 4
- 229920001567 vinyl ester resin Polymers 0.000 description 4
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 description 3
- 229920000299 Nylon 12 Polymers 0.000 description 3
- 206010040925 Skin striae Diseases 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000012778 molding material Substances 0.000 description 3
- 229920000092 linear low density polyethylene Polymers 0.000 description 2
- 239000004707 linear low-density polyethylene Substances 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000002654 heat shrinkable material Substances 0.000 description 1
- 210000001577 neostriatum Anatomy 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/4434—Central member to take up tensile loads
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は、光フアイバーケーブ
ルの中心構造体に用いられる光フアイバーケーブル用中
心構造体に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a central structure for an optical fiber cable, which is used as a central structure for an optical fiber cable.
【０００２】0002
【従来の技術】光フアイバーケーブルの中心部分には、
一般に、抗張力線（テンシヨンメンバー）が用いられて
いる。上記テンシヨンメンバーとしては、通常、鋼線や
強化プラスチツク線条体（ＦＲＰ）が用いられ、このテ
ンシヨンメンバーの外周には熱可塑性樹脂が一次被覆さ
れ層形成されている。さらに、この熱可塑性樹脂層の外
周には、複数の光フアイバーを各々収容する複数の凹条
溝が形成されたポリエチレン製等のスロツトが形成され
、光フアイバーケーブル用中心構造体となる。上記一次
被覆用熱可塑性樹脂としては、一般に、低密度ポリエチ
レン，高密度ポリエチレン，直鎖状低密度ポリエチレン
，接着性ポリエチレン，エチレン−酢酸ビニル共重合体
，ナイロン１２等が用いられている。このような光フア
イバーケーブル用中心構造体は、例えば、まず、一次被
覆熱可塑性樹脂層を、クロスヘツドを有する押出成形機
によりテンシヨンメンバーの外周に形成する。そして、
上記熱可塑性樹脂層が外周に形成されたテンシヨンメン
バーのさらに外周に、複数の凹条溝形成用の成形ダイス
を有する押出成形機を用いてスロツト部を形成する。こ
のようにして、光フアイバーケーブル用の中心構造体が
得られる。[Prior art] In the central part of an optical fiber cable,
Generally, tensile strength wires (tension members) are used. As the tension member, a steel wire or a reinforced plastic filament (FRP) is usually used, and the outer periphery of the tension member is primarily coated with a thermoplastic resin layer. Further, on the outer periphery of this thermoplastic resin layer, slots made of polyethylene or the like are formed, each having a plurality of grooves for accommodating a plurality of optical fibers, forming a central structure for an optical fiber cable. As the thermoplastic resin for the primary coating, low density polyethylene, high density polyethylene, linear low density polyethylene, adhesive polyethylene, ethylene-vinyl acetate copolymer, nylon 12, etc. are generally used. Such a central structure for an optical fiber cable is produced, for example, by first forming a primary coating thermoplastic resin layer on the outer periphery of a tension member using an extrusion molding machine having a crosshead. and,
A slot portion is formed on the outer periphery of the tension member on which the thermoplastic resin layer is formed using an extrusion molding machine having a plurality of molding dies for forming grooves. In this way, a central structure for a fiber optic cable is obtained.
【０００３】0003
【発明が解決しようとする課題】しかしながら、上記の
ようにして得られる従来の中心構造体は、その中心のテ
ンシヨンメンバーと、テンシヨンメンバーの外周に一次
被覆し層形成された熱可塑性樹脂との密着性に劣るとい
う問題を有している。特に、上記熱可塑性樹脂のなかで
も、比較的テンシヨンメンバーとの密着性に優れている
接着性ポリエチレン，エチレン−酢酸ビニル共重合体，
ナイロン１２を用いても、満足のいく密着性が得られな
い。また、テンシヨンメンバーとしてアラミド繊維強化
プラスチツク線条体を用いた場合、充分な密着性が得ら
れないのが実情である。[Problems to be Solved by the Invention] However, the conventional central structure obtained as described above has a tension member at the center and a thermoplastic resin layer formed as a primary coating around the outer periphery of the tension member. The problem is that the adhesion is poor. In particular, among the above thermoplastic resins, adhesive polyethylene, ethylene-vinyl acetate copolymer, which has relatively excellent adhesion to the tension member,
Even if nylon 12 is used, satisfactory adhesion cannot be obtained. Furthermore, when an aramid fiber-reinforced plastic striae is used as a tension member, the actual situation is that sufficient adhesion cannot be obtained.
【０００４】この発明は、このような事情に鑑みなされ
たもので、テンシヨンメンバーと、その外周に形成され
る樹脂層との密着性に優れた光フアイバーケーブル用中
心構造体の提供をその目的とする。The present invention was made in view of the above circumstances, and an object thereof is to provide a central structure for an optical fiber cable that has excellent adhesion between a tension member and a resin layer formed on the outer periphery of the tension member. shall be.
【０００５】[0005]
【課題を解決するための手段】上記の目的を達成するた
め、この発明の光フアイバーケーブル用中心構造体は、
強化プラスチツク線条体の外周に接着層が形成され、上
記接着層の外周面に熱収縮性完了樹脂層が形成され、さ
らに上記熱収縮性完了樹脂層の外周に、軸方向に延びる
凹条溝が円周方向に複数個形成された熱可塑性樹脂層が
形成されているという構成をとる。[Means for Solving the Problems] In order to achieve the above object, the central structure for an optical fiber cable of the present invention has the following features:
An adhesive layer is formed on the outer periphery of the reinforced plastic filament, a heat-shrinkable resin layer is formed on the outer periphery of the adhesive layer, and a concave groove extending in the axial direction is formed on the outer periphery of the heat-shrinkable resin layer. The thermoplastic resin layer has a plurality of thermoplastic resin layers formed in the circumferential direction.
【０００６】[0006]
【作用】すなわち、この発明の光フアイバーケーブル用
中心構造体は、強化プラスチツク線条体の外周に、接着
層が形成され、さらに上記接着層の外周に熱収縮性顔料
樹脂層が形成されている。このため、上記熱収縮性完了
樹脂の熱収縮力により接着層が強化プラスチツク線条体
に強固に接着される。したがつて、強化プラスチツク線
条体とその外周に形成される層との密着性が向上する。[Operation] That is, in the central structure for an optical fiber cable of the present invention, an adhesive layer is formed on the outer periphery of a reinforced plastic filament, and a heat-shrinkable pigment resin layer is further formed on the outer periphery of the adhesive layer. . Therefore, the adhesive layer is firmly adhered to the reinforced plastic filament by the heat shrinkage force of the heat-shrinkable resin. Therefore, the adhesion between the reinforced plastic striated body and the layer formed around its outer periphery is improved.
【０００７】つぎに、この発明を詳しく説明する。Next, the present invention will be explained in detail.
【０００８】この発明の光フアイバーケーブル用中心構
造体は、図１に示すように、強化プラスチツク線条体１
と、この強化プラスチツク線条体１の外周に形成される
接着層２と、この接着層２の外周に形成される熱収縮性
完了樹脂層３と、さらにその外周に形成される熱可塑性
樹脂層４との構成からなる。As shown in FIG. 1, the central structure for an optical fiber cable of the present invention includes a reinforced plastic striated body 1.
, an adhesive layer 2 formed on the outer periphery of this reinforced plastic filament 1, a heat-shrinkable resin layer 3 formed on the outer periphery of this adhesive layer 2, and a thermoplastic resin layer further formed on the outer periphery. It consists of 4.
【０００９】上記強化プラスチツク線条体１は、補強繊
維と含浸樹脂とを用いて得られる。上記補強繊維として
は、アラミド繊維，ガラス繊維等があげられる。また、
上記含浸樹脂としては、ビニルエステル樹脂，エポキシ
樹脂等があげられる。特に、補強繊維としてアラミド繊
維を用い、含浸樹脂としてビニルエステル樹脂を用いた
アラミド繊維強化プラスチツク線条体が好適に用いられ
る。そして、上記アラミド繊維強化プラスチツク線条体
を用いる場合、そのアラミド繊維の体積含有率が５０〜
７０％のものを用いるのが好ましい。The reinforced plastic filament 1 is obtained using reinforcing fibers and impregnated resin. Examples of the reinforcing fibers include aramid fibers and glass fibers. Also,
Examples of the impregnating resin include vinyl ester resin, epoxy resin, and the like. In particular, an aramid fiber-reinforced plastic strand using aramid fiber as the reinforcing fiber and vinyl ester resin as the impregnated resin is preferably used. When the aramid fiber reinforced plastic striae mentioned above is used, the volume content of the aramid fibers is 50 to 50%.
It is preferable to use 70%.
【００１０】上記接着層２形成材料としては、エチレン
−酢酸ビニル共重合体，低密度ポリエチレン，高密度ポ
リエチレン，直鎖状低密度ポリエチレン，接着性ポリエ
チレン等があげられる。なかでも、エチレン−酢酸ビニ
ル共重合体が好適に用いられ、特に酢酸ビニル含有量が
１９〜４５重量％のものを用いるのが好ましい。すなわ
ち、酢酸ビニル含有量が１９重量％未満ではテンシヨン
メンバーに対する密着力が弱く、４５重量％を超えると
テンシヨンメンバーの外周に層形成する場合に均一な厚
みで層形成するのが困難になる傾向がみられるからであ
る。Examples of the material for forming the adhesive layer 2 include ethylene-vinyl acetate copolymer, low-density polyethylene, high-density polyethylene, linear low-density polyethylene, and adhesive polyethylene. Among these, ethylene-vinyl acetate copolymers are preferably used, particularly those having a vinyl acetate content of 19 to 45% by weight. That is, if the vinyl acetate content is less than 19% by weight, the adhesion to the tension member is weak, and if it exceeds 45% by weight, it becomes difficult to form a layer with a uniform thickness when forming a layer around the outer periphery of the tension member. This is because there is a trend.
【００１１】上記熱収縮性完了樹脂層３形成材料として
は、熱収縮性樹脂が用いられ、特に、後記の熱可塑性樹
脂層４形成材料との密着性に優れたものが好ましい。例
えば熱収縮性ポリエチレン等があげられる。このような
熱収縮性樹脂の形態としては、チユーブ状のものを用い
るのが作業性等の観点から好ましい。そして、このよう
な熱収縮性樹脂の収縮率は、３０〜７０％の範囲が好ま
しく、特に好ましくは４０〜６０％である。すなわち、
熱収縮性樹脂の収縮率が３０％未満では、樹脂の収縮に
より生じる接着層に対する締めつけ力が不足し充分な密
着力が得られず、逆に７０％を超えると中心構造体の軸
方向における収縮の不均一が生ずる傾向がみられるから
である。[0011] As the material for forming the heat-shrinkable resin layer 3, a heat-shrinkable resin is used, and a material having excellent adhesion with the material for forming the thermoplastic resin layer 4 described later is particularly preferred. For example, heat-shrinkable polyethylene may be used. As for the form of such heat-shrinkable resin, it is preferable to use a tube-like form from the viewpoint of workability and the like. The shrinkage rate of such a heat-shrinkable resin is preferably in the range of 30 to 70%, particularly preferably in the range of 40 to 60%. That is,
If the shrinkage rate of the heat-shrinkable resin is less than 30%, the tightening force against the adhesive layer caused by the shrinkage of the resin will be insufficient, making it impossible to obtain sufficient adhesion.On the other hand, if it exceeds 70%, the central structure will shrink in the axial direction. This is because there is a tendency for non-uniformity to occur.
【００１２】上記熱可塑性樹脂層４形成材料として、特
に限定するものではなく従来公知のものが用いられ、ポ
リエチレン，塩化ビニル樹脂等があげられる。The material for forming the thermoplastic resin layer 4 is not particularly limited, and conventionally known materials may be used, such as polyethylene, vinyl chloride resin, etc.
【００１３】この発明の光フアイバーケーブル用中心構
造体は、例えばつぎのようにして作製される。すなわち
、まず、補強繊維と含浸樹脂とからなる成形材料を準備
し、これらを用いて連続引抜成形により強化プラスチツ
ク線条体を作製する。そして、上記強化プラスチツク線
条体の外周に押出成形機により均一に接着層を形成する
。つぎに、上記接着層の外周に熱収縮性樹脂製チユーブ
を被覆し加熱することにより上記チユーブを熱収縮させ
熱収縮性完了樹脂層を形成する。さらに、凹条溝に対応
する成形部が形成されたダイスを有する押出成形機を用
いて熱可塑性樹脂を溶融押出し、上記熱収縮性完了樹脂
層の外周に熱可塑性樹脂層を形成する。このような一連
の工程を経ることにより光フアイバーケーブル用中心構
造体が作製される。The central structure for an optical fiber cable of the present invention is manufactured, for example, as follows. That is, first, a molding material consisting of reinforcing fibers and impregnated resin is prepared, and a reinforced plastic linear body is produced by continuous pultrusion using these materials. Then, an adhesive layer is uniformly formed on the outer periphery of the reinforced plastic filament using an extrusion molding machine. Next, a heat-shrinkable resin tube is coated on the outer periphery of the adhesive layer and heated to cause the tube to be heat-shrinked to form a heat-shrinkable resin layer. Further, the thermoplastic resin is melt-extruded using an extrusion molding machine having a die in which molding portions corresponding to the grooves are formed, thereby forming a thermoplastic resin layer around the outer periphery of the heat-shrinkable resin layer. A central structure for an optical fiber cable is produced through such a series of steps.
【００１４】上記熱収縮性樹脂製チユーブを熱収縮させ
る温度としては、接着層形成材料の軟化温度より高い温
度に設定する必要があり、例えば１５０〜２３０℃に設
定するのが好ましい。上記温度に設定することにより、
接着層形成材料の粘度が下がり、強化プラスチツク線条
体への濡れ性が向上し、その結果、接着層と強化プラス
チツク線条体との密着性が向上する。The temperature at which the heat-shrinkable resin tube is heat-shrinked must be set at a temperature higher than the softening temperature of the adhesive layer forming material, and is preferably set at, for example, 150 to 230°C. By setting the temperature above,
The viscosity of the adhesive layer-forming material is reduced, and its wettability to the reinforced plastic strands is improved, resulting in improved adhesion between the adhesive layer and the reinforced plastic strands.
【００１５】このようにして得られる光フアイバーケー
ブル用中心構造体は、図１に示すように、強化プラスチ
ツク線条体１の外周に接着層２が形成され、この接着層
２の外周に熱収縮性完了樹脂層３が形成されている。そ
して、この熱収縮性完了樹脂層３の外周には、軸方向に
延びる光フアイバー収納用の凹条溝５が円周方向に５個
形成された熱可塑性樹脂層４が形成されている。As shown in FIG. 1, the core structure for an optical fiber cable obtained in this way has an adhesive layer 2 formed on the outer periphery of a reinforced plastic filament 1, and a heat-shrinkable material on the outer periphery of the adhesive layer 2. A completed resin layer 3 is formed. On the outer periphery of this heat-shrinkable resin layer 3, there is formed a thermoplastic resin layer 4 in which five grooves 5 for storing optical fibers extending in the axial direction are formed in the circumferential direction.
【００１６】[0016]
【発明の効果】以上のように、この発明の光フアイバー
ケーブル用中心構造体は、強化プラスチツク線条体の外
周に、接着層が形成され、さらに上記接着層の外周に熱
収縮性完了樹脂層が形成されている。このため、上記熱
収縮性完了樹脂の熱収縮力により接着層が強化プラスチ
ツク線条体に強固に接着される。さらに、強化プラスチ
ツク線条体に対する防水性が付与されることになる。し
たがつて、強化プラスチツク線条体とその外周に形成さ
れる樹脂層との密着性が向上する。そして、この発明の
光フアイバーケーブル用中心構造体を高いテンシヨンで
巻き取ると、熱収縮性完了樹脂層がクツシヨンの役割を
果たし、整列巻き状に巻き取ることができる。As described above, in the central structure for optical fiber cable of the present invention, an adhesive layer is formed on the outer periphery of the reinforced plastic filament, and a heat-shrinkable resin layer is further formed on the outer periphery of the adhesive layer. is formed. Therefore, the adhesive layer is firmly adhered to the reinforced plastic filament by the heat shrinkage force of the heat-shrinkable resin. Furthermore, waterproof properties will be imparted to the reinforced plastic striae. Therefore, the adhesion between the reinforced plastic filament and the resin layer formed on its outer periphery is improved. When the central structure for an optical fiber cable of the present invention is wound up with high tension, the heat-shrinkable resin layer acts as a cushion and can be wound up in an aligned manner.
【００１７】つぎに、実施例について比較例と併せて説
明する。Next, examples will be explained together with comparative examples.
【００１８】[0018]
【実施例１】まず、ビニルエステル樹脂とアラミド繊維
とからなる成形用材料をダイスに通し、連続引抜成形を
行うことによりビニルエステル樹脂を含浸させた直径４
．５ｍｍのアラミド繊維強化プラスチツク線条体（アラ
ミド繊維体積含有量５５％）を作製した。ついで、クロ
スヘツドを有する押出成形機を用いて上記アラミド繊維
強化プラスチツク線条体の外周に、厚み０．２ｍｍのエ
チレン−酢酸ビニル共重合体（酢酸ビニル含有量２８重
量％）層を形成した。ついで、熱収縮性ポリエチレンチ
ユーブを上記エチレン−酢酸ビニル共重合体層の外周に
被覆し、温度２００℃で２分間加熱することにより上記
熱収縮性ポリエチレンチユーブを収縮させて厚み０．３
ｍｍの熱収縮性完了ポリエチレン層を形成した。そして
、外周にエチレン−酢酸ビニル共重合体層および熱収縮
性完了ポリエチレン層の形成されたアラミド繊維強化プ
ラスチツク線条体の最外層に、凹条溝に対応する成形部
が形成されたダイスを備えた押出成形機を用いてポリエ
チレンを溶融押出することにより軸方向に延びる凹条溝
が円周方向に５個形成されたポリエチレン層を形成した
。このような工程を経ることにより目的とする光フアイ
バーケーブル用中心構造体を作製した。得られた光フア
イバーケーブル用中心構造体を図１に示した。図におい
て、１はアラミド繊維強化プラスチツク線条体、２はエ
チレン−酢酸ビニル共重合体層、３は熱収縮性完了ポリ
エチレン層、４は軸方向に延びる凹条溝５が円周方向に
５個形成されたポリエチレン層である。[Example 1] First, a molding material made of vinyl ester resin and aramid fiber was passed through a die, and continuous pultrusion was performed to make a molding material with a diameter of 4 mm impregnated with vinyl ester resin.
．． A 5 mm aramid fiber reinforced plastic striatum (aramid fiber volume content 55%) was prepared. Next, an ethylene-vinyl acetate copolymer (vinyl acetate content: 28% by weight) layer having a thickness of 0.2 mm was formed around the outer periphery of the aramid fiber-reinforced plastic strip using an extrusion molding machine having a crosshead. Next, a heat-shrinkable polyethylene tube is coated around the outer periphery of the ethylene-vinyl acetate copolymer layer, and heated at 200°C for 2 minutes to shrink the heat-shrinkable polyethylene tube to a thickness of 0.3.
A heat-shrinkable finished polyethylene layer of mm was formed. The outermost layer of the aramid fiber-reinforced plastic filament, on which an ethylene-vinyl acetate copolymer layer and a heat-shrinkable polyethylene layer are formed on the outer periphery, is equipped with a die in which a molded portion corresponding to the groove is formed. By melt-extruding polyethylene using an extrusion molding machine, a polyethylene layer was formed in which five grooves extending in the axial direction were formed in the circumferential direction. Through these steps, the desired central structure for an optical fiber cable was produced. The obtained central structure for an optical fiber cable is shown in FIG. In the figure, 1 is an aramid fiber-reinforced plastic filament, 2 is an ethylene-vinyl acetate copolymer layer, 3 is a heat-shrinkable polyethylene layer, and 4 is 5 grooves 5 extending in the axial direction in the circumferential direction. A polyethylene layer formed.
【００１９】[0019]
【比較例１】直径４．５ｍｍのアラミド繊維強化プラス
チツク線条体を作製し、このアラミド繊維強化プラスチ
ツク線条体の外周に押出成形により厚み０．５ｍｍの高
密度ポリエチレン層を形成した。そして、熱収縮性完了
ポリエチレン層を形成しなかつた。これ以外は実施例１
と同様にして光フアイバーケーブル用中心構造体を作製
した。[Comparative Example 1] An aramid fiber-reinforced plastic strand with a diameter of 4.5 mm was prepared, and a high-density polyethylene layer with a thickness of 0.5 mm was formed on the outer periphery of the aramid fiber-reinforced plastic strand by extrusion molding. And no heat-shrinkable polyethylene layer was formed. Other than this, Example 1
A central structure for an optical fiber cable was produced in the same manner as described above.
【００２０】[0020]
【比較例２】高密度ポリエチレンをナイロン１２に代え
た。それ以外は比較例１と同様にして光フアイバーケー
ブル用中心構造体を作製した。[Comparative Example 2] High-density polyethylene was replaced with nylon 12. Other than that, a central structure for an optical fiber cable was produced in the same manner as in Comparative Example 1.
【００２１】このようにして得られた実施例品および比
較例品のアラミド繊維強化プラスチツク線条体とこのア
ラミド繊維強化プラスチツク線条体に形成された樹脂層
との密着力を測定し評価し、後記の表１に示した。上記
密着力の測定方法を下記に示す。[0021] The adhesion between the aramid fiber-reinforced plastic striated bodies of the example products and comparative example products thus obtained and the resin layer formed on the aramid fiber-reinforced plastic striated bodies was measured and evaluated. It is shown in Table 1 below. The method for measuring the adhesion is shown below.
【００２２】〔密着力の測定方法〕まず、図２に示すよ
うに、長さ１５０ｍｍの光フアイバーケーブル用中心構
造体のうち、長さ２５ｍｍの部分だけ樹脂層６を残し、
残りの部分がアラミド繊維強化プラスチツク線条体１が
剥き出しにした密着力測定用試験片を作製した。そして
、図３に示すように、アラミド繊維強化プラスチツク線
条体１剥き出しの長い部分をチヤツク７で挟持し、樹脂
層６の端部面に当接するよう引張具８を取りつけ矢印Ａ
方向に引つ張り、測定装置（オートグラフＧ−５０００
Ａ，島津製作所社製）で密着力を測定した。なお、引張
スピードは５ｍｍ／ｍｉｎ で、測定温度は２３℃に設
定した。[Method for Measuring Adhesion] First, as shown in FIG. 2, the resin layer 6 is left only in a 25 mm long portion of the optical fiber cable central structure having a length of 150 mm.
A test piece for adhesion measurement was prepared in which the remaining portion of the aramid fiber-reinforced plastic filament 1 was exposed. Then, as shown in FIG. 3, the exposed long part of the aramid fiber-reinforced plastic filament 1 is held between chucks 7, and a tensioning tool 8 is attached so as to come into contact with the end surface of the resin layer 6.
Pull in the direction, measuring device (Autograph G-5000
A, manufactured by Shimadzu Corporation), the adhesion force was measured. Note that the tensile speed was 5 mm/min, and the measurement temperature was set at 23°C.
【００２３】[0023]
【表１】[Table 1]
【００２４】上記表１の結果から、実施例品は比較例品
より高い密着力の数値が得られた。このことから、実施
例品はアラミド繊維強化プラスチツク線条体とこの外周
に形成された樹脂層との密着性に優れていることがわか
る。From the results shown in Table 1 above, the Example products had higher adhesion values than the Comparative Example products. From this, it can be seen that the example product has excellent adhesion between the aramid fiber-reinforced plastic linear body and the resin layer formed on the outer periphery thereof.
【図１】この発明の光フアイバーケーブル用中心構造体
の断面図である。FIG. 1 is a sectional view of a central structure for an optical fiber cable according to the present invention.
【図２】密着力測定用試験片の形状を示す側面図である
。FIG. 2 is a side view showing the shape of a test piece for adhesion measurement.
【図３】密着力測定方法を示す模式図である。FIG. 3 is a schematic diagram showing a method for measuring adhesion force.
１ アラミド繊維強化プラスチツク線条体２ エチ
レン−酢酸ビニル共重合体層３ 熱収縮性完了ポリエ
チレン層
４ ポリエチレン層
５ 凹条溝1 Aramid fiber-reinforced plastic striated body 2 Ethylene-vinyl acetate copolymer layer 3 Heat-shrinkable polyethylene layer 4 Polyethylene layer 5 Concave groove
Claims (5)
層が形成され、上記接着層の外周面に熱収縮性完了樹脂
層が形成され、さらに上記熱収縮性完了樹脂層の外周に
、軸方向に延びる凹条溝が円周方向に複数個形成された
熱可塑性樹脂層が形成されていることを特徴とする光フ
アイバーケーブル用中心構造体。1. An adhesive layer is formed on the outer periphery of the reinforced plastic filament, a heat-shrinkable resin layer is formed on the outer peripheral surface of the adhesive layer, and a heat-shrinkable resin layer is formed on the outer periphery of the heat-shrinkable resin layer in the axial direction. 1. A central structure for an optical fiber cable, characterized in that a thermoplastic resin layer is formed with a plurality of grooves extending in the circumferential direction.
繊維強化プラスチツク線条体である請求項１記載の光フ
アイバーケーブル用中心構造体。2. The central structure for an optical fiber cable according to claim 1, wherein the reinforced plastic strand is an aramid fiber reinforced plastic strand.
合体により形成されたものである請求項１または２記載
の光フアイバーケーブル用中心構造体。3. The central structure for an optical fiber cable according to claim 1, wherein the adhesive layer is formed of an ethylene-vinyl acetate copolymer.
ビニル含有量が１９〜４５重量％である請求項３記載の
光フアイバーケーブル用中心構造体。4. The central structure for an optical fiber cable according to claim 3, wherein the vinyl acetate content of the ethylene-vinyl acetate copolymer is 19 to 45% by weight.
０％を有する熱収縮性樹脂が熱収縮したものである請求
項１〜４のいずれか一項に記載の光フアイバーケーブル
用中心構造体。[Claim 5] The heat-shrinkable resin has a shrinkage rate of 30 to 7.
The central structure for an optical fiber cable according to any one of claims 1 to 4, wherein the heat-shrinkable resin has a heat-shrinkable content of 0%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3074746A JPH04284409A (en) | 1991-03-13 | 1991-03-13 | Central structural body for optical fiber cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3074746A JPH04284409A (en) | 1991-03-13 | 1991-03-13 | Central structural body for optical fiber cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04284409A true JPH04284409A (en) | 1992-10-09 |
Family
ID=13556127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3074746A Pending JPH04284409A (en) | 1991-03-13 | 1991-03-13 | Central structural body for optical fiber cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04284409A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3525022A4 (en) * | 2016-10-04 | 2020-06-10 | Sumitomo Electric Industries, Ltd. | Slot rod and optical fiber cable |
-
1991
- 1991-03-13 JP JP3074746A patent/JPH04284409A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3525022A4 (en) * | 2016-10-04 | 2020-06-10 | Sumitomo Electric Industries, Ltd. | Slot rod and optical fiber cable |
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