WO2015037602A1 - Cable - Google Patents

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Publication number
WO2015037602A1
WO2015037602A1 PCT/JP2014/073885 JP2014073885W WO2015037602A1 WO 2015037602 A1 WO2015037602 A1 WO 2015037602A1 JP 2014073885 W JP2014073885 W JP 2014073885W WO 2015037602 A1 WO2015037602 A1 WO 2015037602A1
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Prior art keywords
coating layer
cable
degrees
hardness
inner coating
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PCT/JP2014/073885
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French (fr)
Japanese (ja)
Inventor
孝哉 小堀
祐司 越智
智 橋本
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住友電気工業株式会社
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Application filed by 住友電気工業株式会社 filed Critical 住友電気工業株式会社
Priority to MX2016001015A priority Critical patent/MX349094B/en
Priority to CN201480041983.1A priority patent/CN105637596B/en
Priority to DE112014004143.2T priority patent/DE112014004143T5/en
Publication of WO2015037602A1 publication Critical patent/WO2015037602A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame

Definitions

  • the present invention relates to a cable having a pair of insulated wires twisted together.
  • a coating layer is provided on the outside of a multi-core stranded wire in which a plurality of insulated wires are twisted, and the inner layer of the coating layer is an ethylene vinyl acetate copolymer (EVA) or an ethylene ⁇ -olefin copolymer
  • EVA ethylene vinyl acetate copolymer
  • a cable is known in which the outer layer is made of thermoplastic polyurethane or the like and is subjected to a crosslinking treatment (see, for example, Patent Document 1).
  • the object of the present invention is to provide a cable that is difficult to have a wire rod.
  • the cable of the present invention A pair of insulated wires twisted together; An inner covering layer made of non-crosslinked polyurethane covering the periphery of the pair of insulated wires; An outer coating layer made of non-crosslinked polyurethane covering the periphery of the inner coating layer,
  • the inner coating layer has a Shore A hardness of 90 degrees or more and 100 degrees or less, The hardness of the outer coating layer is not less than 80 degrees and not more than 90 degrees in Shore A hardness, and is 5 to 10 degrees smaller than the hardness of the inner coating layer.
  • the multi-core cable according to the embodiment of the present invention is (1) a pair of insulated wires twisted together; An inner covering layer made of non-crosslinked polyurethane covering the periphery of the pair of insulated wires; An outer coating layer made of non-crosslinked polyurethane covering the periphery of the inner coating layer,
  • the inner coating layer has a Shore A hardness of 90 degrees or more and 100 degrees or less, The hardness of the outer coating layer is not less than 80 degrees and not more than 90 degrees in Shore A hardness, and is 5 to 10 degrees smaller than the hardness of the inner coating layer.
  • the inner coating layer and the outer coating layer are made of non-crosslinked polyurethane, the processing cost for crosslinking is unnecessary, and cost reduction can be realized. Further, when the Shore A hardness of the inner coating layer and the outer coating layer is in the above range, it is difficult to cause wire wrinkles when the cable is bent, and it is excellent in workability and handleability.
  • Each of the pair of insulated wires includes a conductor and an insulator covering the conductor,
  • the insulator is preferably made of cross-linked polyethylene. Since the insulator of the insulated wire is cross-linked, the heat resistance of the insulated wire can be maintained.
  • the cross-sectional area of the conductor is 0.25 mm 2 or more and 0.5 mm 2 or less.
  • the thickness of the outer coating layer is 0.2 mm or greater and 0.6 mm or less.
  • the cable 10 includes two insulated wires 11 in a set.
  • the insulated wires 11 are constituted by a so-called twisted pair method in which the insulated wires 11 are twisted together.
  • the insulated wires 11 are all wires in which the conductor 12 is covered with the insulator 13.
  • the conductor 12 of the insulated wire 11 is formed of, for example, a stranded wire obtained by twisting three stranded wires obtained by twisting 16 copper alloy wires having an outer diameter of 0.08 mm.
  • the outer diameter of the conductor 12 is, for example, 0.82 mm.
  • the cross-sectional area of the conductor 12 is 0.25 mm 2 .
  • a flame-retardant polyethylene As a material of the insulator 13 at this time, it is preferable to use a flame-retardant polyethylene.
  • the outer diameter of the insulator 13 is 1.4 mm, for example.
  • the insulated electric wire 11 configured in this way is irradiated with an electron beam and subjected to crosslinking treatment.
  • the insulator 13 may be formed of a flame retardant polyolefin resin.
  • the periphery of the pair of insulated wires 11 twisted in pairs is covered with an inner coating layer 21.
  • the inner coating layer 21 is made of non-crosslinked polyurethane that is not crosslinked.
  • the inner covering layer 21 has a function of improving the roundness in the cross section of the cable 10.
  • the periphery of the inner coating layer 21 is covered with the outer coating layer 22.
  • the outer coating layer 22 is made of non-crosslinked polyurethane that is not crosslinked. Thereby, the outer coating layer 22 can obtain an excellent heat fusion property with PBT or nylon of a molding material constituting various devices.
  • a block copolymer As the non-crosslinked polyurethane constituting the inner coating layer 21 and the outer coating layer 22, a block copolymer can be exemplified.
  • the block copolymer has a polyurethane portion as a hard segment and an amorphous polymer as a soft segment.
  • the polyurethane part is composed of a diisocyanate such as MDI or TDI and a diol such as ethylene glycol.
  • amorphous polymer polyether, polyester, polycarbonate or the like is used.
  • polyether-based non-crosslinked polyurethane can be suitably used from the viewpoints of flexibility, hydrolysis resistance, low-temperature bending characteristics, and the like.
  • the outer diameter of the inner coating layer 21 is, for example, 3.4 mm, and the outer diameter of the outer coating layer 22 is, for example, 4.0 mm.
  • the cable 12 can be used with the cross-sectional area of the conductor 12 of each insulated wire 11 being 0.3 mm 2 and the outer diameter of the insulator 13 being 1.7 mm.
  • the outer diameter of the inner coating layer 21 is 4.4 mm, and the outer diameter of the outer coating layer is 5.0 mm.
  • a cable in which the cross-sectional area of the conductor 12 of each insulated wire 11 is 0.5 mm 2 and the outer diameter of the insulator 13 is 2.0 m can be used.
  • the outer diameter of the inner coating layer 21 is 4.6 mm
  • the outer diameter of the outer coating layer is 6.2 mm.
  • the thickness dimensions of the insulator 13, the inner coating layer 21, and the outer coating layer 22 are determined from the electrical characteristics and mechanical characteristics if the cross-sectional area (outer diameter) of the conductor 12 is determined.
  • the thickness of the outer covering layer 22 is set to 0.2 to It may be in the range of 0.6 mm.
  • the thickness of the outer coating layer 22 is preferably 0.3 mm or more, for example.
  • the hardness (Shore A hardness) of the inner coating layer 21 is 90 degrees or more and 100 degrees or less, and particularly preferably 95 degrees. Further, the hardness (Shore A hardness) of the outer coating layer 22 is not less than 80 degrees and not more than 90 degrees, and particularly preferably 85 degrees. That is, the Shore A hardness of the outer coating layer 22 is set to be 5 to 10 degrees smaller than the Shore A hardness of the inner coating layer 21.
  • the cable 10 of the present embodiment configured as described above, first, a pair of insulated wires 11 is twisted. Then, the inner coating layer 21 is formed around the pair of insulated wires 11 that are twisted in pairs, and the outer coating layer 22 is formed on the outer periphery of the inner coating layer 21.
  • the processing cost for the crosslinking treatment becomes unnecessary, and the cost can be reduced. Can be realized.
  • the hardness of the inner coating layer 21 is 90 degrees or more and 100 degrees or less in Shore A hardness
  • the hardness of the outer coating layer 22 is 80 degrees or more and 90 degrees or less in Shore A hardness, and is 5 more than the hardness of the inner coating layer 21.
  • the insulator 13 of the insulated wire 11 is made of crosslinked polyethylene, the insulated wire can be used even if the inner coating layer 21 and the outer coating layer 22 are not crosslinked. The heat resistance of 11 can be sufficiently maintained.
  • the cross-sectional area of the conductor 12 of the insulated wire 11 is 0.25 mm 2 to 0.5 mm 2
  • the thickness of the outer covering layer 22 is 0.2 to 0. Since it is 6 mm, the effect of reducing wire wrinkles can be sufficiently obtained.
  • Example 2 A wire rod evaluation test was performed using the cable of this embodiment in which the inner coating layer and the outer coating layer are made of non-crosslinked flame-retardant polyurethane.
  • the hardness of the inner coating layer was 90 to 100 degrees, and the hardness of the outer coating layer was 80 to 90 degrees.
  • a cable cut to a length of 150 mm was bent in a U shape so as to have a bending radius of 10 mm, and both ends of the cable were fixed with tape or the like and held for 24 hours. Thereafter, the cable was released, the cable was suspended with one end fixed, and the displacement D (mm) after 24 hours was measured (see FIG. 2). The case where this transition amount D was 50 mm or less was regarded as passing the wire rod evaluation test.
  • Table 1 shows the results of the above wire rod evaluation test.
  • the inner coating layer and the outer coating layer made of non-crosslinked polyurethane are provided, the hardness of the inner coating layer is 90 degrees to 100 degrees, the hardness of the outer coating layer is 80 degrees to 90 degrees, In Examples where the hardness was 5 to 10 degrees smaller than the hardness of the inner coating layer, it was confirmed that a sufficient effect of reducing the wrinkle was obtained.
  • the number and arrangement of the insulated wires 11 in the cable 10 of the above embodiment are not limited to this embodiment. It is good also as a structure by which two or more pairs of insulated wires are contained in a cable.

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  • Insulated Conductors (AREA)

Abstract

This invention provides a cable that, while being more resistant to kinking, can be manufactured at low cost. Said cable (10) comprises a twisted pair of insulated wires (11), an inner jacket layer (21) that comprises a non-crosslinked polyurethane and surrounds the insulated wires (11), and an outer jacket layer (22) that also comprises a non-crosslinked polyurethane and surrounds the inner jacket layer (21). The Shore A hardness of the inner jacket layer (21) is between 90 and 100, inclusive. The Shore A hardness of the outer jacket layer (22) is between 80 and 90, inclusive, and is 5 to 10 durometer lower than that of the inner jacket layer (21).

Description

ケーブルcable
　本発明は、互いに撚り合わせた一対の絶縁電線を有するケーブルに関する。 The present invention relates to a cable having a pair of insulated wires twisted together.
　非ハロゲン系難燃ケーブルとして、絶縁電線を複数撚り合わせた多芯撚り線の外側に被覆層を設け、当該被覆層の内層をエチレン酢酸ビニル共重合体（ＥＶＡ）またはエチレン系αオレフィン共重合体から構成し、外層を熱可塑性ポリウレタン等から構成するとともに、架橋処理されたケーブルが知られている（例えば、特許文献１参照）。 As a non-halogen flame retardant cable, a coating layer is provided on the outside of a multi-core stranded wire in which a plurality of insulated wires are twisted, and the inner layer of the coating layer is an ethylene vinyl acetate copolymer (EVA) or an ethylene α-olefin copolymer A cable is known in which the outer layer is made of thermoplastic polyurethane or the like and is subjected to a crosslinking treatment (see, for example, Patent Document 1).
日本国特開２０１２－０２８１２３公報Japanese Unexamined Patent Publication No. 2012-028123
　このようなケーブルにおいて、ケーブルを曲げた場合に曲がったままの状態となるいわゆる線癖を低減することが要求されている。 In such a cable, it is required to reduce so-called wire wrinkles that remain bent when the cable is bent.
　本発明は、線癖の付きにくいケーブルを提供することを目的とする。 The object of the present invention is to provide a cable that is difficult to have a wire rod.
　本発明のケーブルは、
　互いに撚り合わせた一対の絶縁電線と、
　前記一対の絶縁電線の周囲を覆う非架橋ポリウレタンからなる内部被覆層と、
　前記内部被覆層の周囲を覆う非架橋ポリウレタンからなる外部被覆層と、を備え、
　前記内部被覆層の硬度は、ショアＡ硬度で９０度以上１００度以下であり、
　前記外部被覆層の硬度は、ショアＡ硬度で８０度以上９０度以下であるとともに、前記内部被覆層の硬度よりも５度～１０度小さい。 The cable of the present invention
A pair of insulated wires twisted together;
An inner covering layer made of non-crosslinked polyurethane covering the periphery of the pair of insulated wires;
An outer coating layer made of non-crosslinked polyurethane covering the periphery of the inner coating layer,
The inner coating layer has a Shore A hardness of 90 degrees or more and 100 degrees or less,
The hardness of the outer coating layer is not less than 80 degrees and not more than 90 degrees in Shore A hardness, and is 5 to 10 degrees smaller than the hardness of the inner coating layer.
　本発明によれば、線癖の付きにくいケーブルを提供することができる。 According to the present invention, it is possible to provide a cable that is difficult to be damaged.
本発明の実施形態に係る多芯ケーブルの一例を示す断面図である。It is sectional drawing which shows an example of the multicore cable which concerns on embodiment of this invention. 図１の多芯ケーブルの曲げ評価方法を示す図である。It is a figure which shows the bending evaluation method of the multicore cable of FIG.
[本願発明の実施形態の説明]
　最初に本願発明の実施形態の内容を列記して説明する。
　本願発明の実施形態に係る多芯ケーブルは、
（１）互いに撚り合わせた一対の絶縁電線と、
　前記一対の絶縁電線の周囲を覆う非架橋ポリウレタンからなる内部被覆層と、
　前記内部被覆層の周囲を覆う非架橋ポリウレタンからなる外部被覆層と、を備え、
　前記内部被覆層の硬度は、ショアＡ硬度で９０度以上１００度以下であり、
　前記外部被覆層の硬度は、ショアＡ硬度で８０度以上９０度以下であるとともに、前記内部被覆層の硬度よりも５度～１０度小さい。
　内部被覆層および外部被覆層が非架橋ポリウレタンから構成されるので、架橋のための加工費が不要で、低コスト化を実現することができる。また、内部被覆層および外部被覆層のショアＡ硬度が上記範囲であると、ケーブルを曲げたときの線癖がつきにくく、加工性や取扱性に優れている。 [Description of Embodiment of Present Invention]
First, the contents of the embodiments of the present invention will be listed and described.
The multi-core cable according to the embodiment of the present invention is
(1) a pair of insulated wires twisted together;
An inner covering layer made of non-crosslinked polyurethane covering the periphery of the pair of insulated wires;
An outer coating layer made of non-crosslinked polyurethane covering the periphery of the inner coating layer,
The inner coating layer has a Shore A hardness of 90 degrees or more and 100 degrees or less,
The hardness of the outer coating layer is not less than 80 degrees and not more than 90 degrees in Shore A hardness, and is 5 to 10 degrees smaller than the hardness of the inner coating layer.
Since the inner coating layer and the outer coating layer are made of non-crosslinked polyurethane, the processing cost for crosslinking is unnecessary, and cost reduction can be realized. Further, when the Shore A hardness of the inner coating layer and the outer coating layer is in the above range, it is difficult to cause wire wrinkles when the cable is bent, and it is excellent in workability and handleability.
　（２）前記一対の絶縁電線は、それぞれ、導体と、前記導体を覆う絶縁体とを備え、
　前記絶縁体は、架橋ポリエチレンから構成されていることが好ましい。
　絶縁電線の絶縁体が架橋処理されているため、絶縁電線の耐熱性は維持することができる。 (2) Each of the pair of insulated wires includes a conductor and an insulator covering the conductor,
The insulator is preferably made of cross-linked polyethylene.
Since the insulator of the insulated wire is cross-linked, the heat resistance of the insulated wire can be maintained.
　線癖がつきにくく加工性に優れたケーブルを実現するために、以下の範囲を満たしていることが好ましい。
　（３）前記導体の断面積は、０．２５ｍｍ２以上０．５ｍｍ２以下である。
　（４）前記外部被覆層の厚さは、０．２ｍｍ以上０．６ｍｍ以下である。 In order to realize a cable that is not easily wrinkled and has excellent workability, it is preferable that the following range is satisfied.
(3) The cross-sectional area of the conductor is 0.25 mm 2 or more and 0.5 mm 2 or less.
(4) The thickness of the outer coating layer is 0.2 mm or greater and 0.6 mm or less.
[本願発明の実施形態の詳細]
　以下、本発明に係るケーブルの例を、図面を参照して説明する。 [Details of the embodiment of the present invention]
Hereinafter, an example of a cable according to the present invention will be described with reference to the drawings.
　図１に示すように、本実施形態に係るケーブル１０は、絶縁電線１１が二本一組で収容されている。絶縁電線１１同士は互いに撚り合わされた、いわゆる対撚り方式にて構成されている。 As shown in FIG. 1, the cable 10 according to this embodiment includes two insulated wires 11 in a set. The insulated wires 11 are constituted by a so-called twisted pair method in which the insulated wires 11 are twisted together.
　絶縁電線１１は、何れも導体１２が絶縁体１３によって覆われた電線である。
　絶縁電線１１の導体１２は、例えば、外径０．０８ｍｍの銅合金線を１６本撚り合わせた撚線を、さらに３本撚り合わせた撚撚線から形成されている。導体１２の外径は、例えば０．８２ｍｍである。このときの導体１２の断面積は、０．２５ｍｍ２である。
　また、このときの絶縁体１３の材料としては、難燃ポリエチレンを用いることが好ましい。絶縁体１３の外径は、例えば、１．４ｍｍである。このように構成された絶縁電線１１には電子線が照射され架橋処理される。なお、絶縁体１３は、難燃ポリオレフィン系の樹脂から形成されてもよい。 The insulated wires 11 are all wires in which the conductor 12 is covered with the insulator 13.
The conductor 12 of the insulated wire 11 is formed of, for example, a stranded wire obtained by twisting three stranded wires obtained by twisting 16 copper alloy wires having an outer diameter of 0.08 mm. The outer diameter of the conductor 12 is, for example, 0.82 mm. At this time, the cross-sectional area of the conductor 12 is 0.25 mm 2 .
Moreover, as a material of the insulator 13 at this time, it is preferable to use a flame-retardant polyethylene. The outer diameter of the insulator 13 is 1.4 mm, for example. The insulated electric wire 11 configured in this way is irradiated with an electron beam and subjected to crosslinking treatment. The insulator 13 may be formed of a flame retardant polyolefin resin.
　対撚りされた一対の絶縁電線１１の周囲は内部被覆層２１によって覆われている。内部被覆層２１は、架橋処理されない非架橋ポリウレタンから構成されている。この内部被覆層２１は、ケーブル１０の横断面における真円度を向上させる機能を有している。 The periphery of the pair of insulated wires 11 twisted in pairs is covered with an inner coating layer 21. The inner coating layer 21 is made of non-crosslinked polyurethane that is not crosslinked. The inner covering layer 21 has a function of improving the roundness in the cross section of the cable 10.
　内部被覆層２１の周囲は、外部被覆層２２によって覆われている。外部被覆層２２は、架橋処理されない非架橋ポリウレタンから構成されている。これにより、外部被覆層２２は、各種の機器等を構成するモールド材のＰＢＴやナイロンとの優れた熱融着性を得ることができる。 The periphery of the inner coating layer 21 is covered with the outer coating layer 22. The outer coating layer 22 is made of non-crosslinked polyurethane that is not crosslinked. Thereby, the outer coating layer 22 can obtain an excellent heat fusion property with PBT or nylon of a molding material constituting various devices.
　内部被覆層２１および外部被覆層２２を構成する非架橋ポリウレタンとしては、ブロック共重合体を例示することができる。ブロック共重合体は、ポリウレタン部をハードセグメントとし、非晶性ポリマーをソフトセグメントとして構成される。ポリウレタン部は、ＭＤＩやＴＤＩなどのジイソシアナートおよびエチレングリコールなどのジオールより構成される。非晶性ポリマーとしては、ポリエーテル、ポリエステル、ポリカーボネートなどが用いられる。非晶性ポリマーとしては、特に、ポリエーテル系の非架橋ポリウレタンが柔軟性、耐加水分解性、低温曲げ特性などの点から好適に使用できる。 As the non-crosslinked polyurethane constituting the inner coating layer 21 and the outer coating layer 22, a block copolymer can be exemplified. The block copolymer has a polyurethane portion as a hard segment and an amorphous polymer as a soft segment. The polyurethane part is composed of a diisocyanate such as MDI or TDI and a diol such as ethylene glycol. As the amorphous polymer, polyether, polyester, polycarbonate or the like is used. As the amorphous polymer, in particular, polyether-based non-crosslinked polyurethane can be suitably used from the viewpoints of flexibility, hydrolysis resistance, low-temperature bending characteristics, and the like.
　内部被覆層２１の外径は、例えば、３．４ｍｍであり、外部被覆層２２の外径は、例えば４．０ｍｍである。 The outer diameter of the inner coating layer 21 is, for example, 3.4 mm, and the outer diameter of the outer coating layer 22 is, for example, 4.0 mm.
　例えば、ケーブル１０としては、それぞれの絶縁電線１１の導体１２の断面積が０．３ｍｍ２であり、絶縁体１３の外径が１．７ｍｍでケーブルを用いることもできる。このとき、内部被覆層２１の外径は４．４ｍｍとなり、外部被覆層の外径は５．０ｍｍとなる。また、ケーブル１０として、それぞれの絶縁電線１１の導体１２の断面積が０．５ｍｍ２であり、絶縁体１３の外径が２．０ｍであるケーブルを用いることもできる。このとき、内部被覆層２１の外径は４．６ｍｍとなり、外部被覆層の外径は６．２ｍｍとなる。 For example, as the cable 10, the cable 12 can be used with the cross-sectional area of the conductor 12 of each insulated wire 11 being 0.3 mm 2 and the outer diameter of the insulator 13 being 1.7 mm. At this time, the outer diameter of the inner coating layer 21 is 4.4 mm, and the outer diameter of the outer coating layer is 5.0 mm. Further, as the cable 10, a cable in which the cross-sectional area of the conductor 12 of each insulated wire 11 is 0.5 mm 2 and the outer diameter of the insulator 13 is 2.0 m can be used. At this time, the outer diameter of the inner coating layer 21 is 4.6 mm, and the outer diameter of the outer coating layer is 6.2 mm.
　なお、絶縁体１３、内部被覆層２１および外部被覆層２２の厚さ寸法は、導体１２の断面積（外径）が決まれば、電気的特性及び機械的特性から決定される。例えば、ケーブル１０の導体１２の断面積が０．２５ｍｍ２～０．５ｍｍ２となる範囲内において、外部被覆層２２の厚さは、線癖が付きにくいようにするために、０．２～０．６ｍｍの範囲であればよい。外部被覆層２２の厚さは、例えば０．３ｍｍ以上であることが好ましい。 Note that the thickness dimensions of the insulator 13, the inner coating layer 21, and the outer coating layer 22 are determined from the electrical characteristics and mechanical characteristics if the cross-sectional area (outer diameter) of the conductor 12 is determined. For example, in the range where the cross-sectional area of the conductor 12 of the cable 10 is 0.25 mm 2 to 0.5 mm 2 , the thickness of the outer covering layer 22 is set to 0.2 to It may be in the range of 0.6 mm. The thickness of the outer coating layer 22 is preferably 0.3 mm or more, for example.
　内部被覆層２１の硬度（ショアＡ硬度）は９０度以上１００度以下であり、特に９５度であることが好ましい。また、外部被覆層２２の硬度（ショアＡ硬度）は、８０度以上９０度以下であり、特に８５度であることが好ましい。すなわち、外部被覆層２２のショアＡ硬度は、内部被覆層２１のショアＡ硬度よりも５度～１０度小さくなるように設定されている。 The hardness (Shore A hardness) of the inner coating layer 21 is 90 degrees or more and 100 degrees or less, and particularly preferably 95 degrees. Further, the hardness (Shore A hardness) of the outer coating layer 22 is not less than 80 degrees and not more than 90 degrees, and particularly preferably 85 degrees. That is, the Shore A hardness of the outer coating layer 22 is set to be 5 to 10 degrees smaller than the Shore A hardness of the inner coating layer 21.
　このように構成された本実施形態のケーブル１０を製造するには、まず、一対の絶縁電線１１を対撚りする。そして、対撚りされた一対の絶縁電線１１の周囲に内部被覆層２１を形成し、さらに内部被覆層２１の外周に外部被覆層２２を形成する。 To manufacture the cable 10 of the present embodiment configured as described above, first, a pair of insulated wires 11 is twisted. Then, the inner coating layer 21 is formed around the pair of insulated wires 11 that are twisted in pairs, and the outer coating layer 22 is formed on the outer periphery of the inner coating layer 21.
　以上説明したように、本実施形態のケーブル１０によれば、内部被覆層２１および外部被覆層２２が非架橋ポリウレタンから構成されるため、架橋処理のための加工費が不要となり、低コスト化を実現することができる。また、内部被覆層２１の硬度をショアＡ硬度で９０度以上１００度以下とし、外部被覆層２２の硬度をショアＡ硬度で８０度以上９０度以下とするとともに内部被覆層２１の硬度よりも５度～１０度小さい値とすることで、ケーブル１０を曲げたときの線癖を低減させ、加工性や取扱性に優れたケーブル１０を提供することができる。 As described above, according to the cable 10 of the present embodiment, since the inner covering layer 21 and the outer covering layer 22 are made of non-crosslinked polyurethane, the processing cost for the crosslinking treatment becomes unnecessary, and the cost can be reduced. Can be realized. Further, the hardness of the inner coating layer 21 is 90 degrees or more and 100 degrees or less in Shore A hardness, the hardness of the outer coating layer 22 is 80 degrees or more and 90 degrees or less in Shore A hardness, and is 5 more than the hardness of the inner coating layer 21. By setting the value to a value that is smaller by 10 to 10 degrees, it is possible to reduce the wire wrinkles when the cable 10 is bent, and to provide the cable 10 with excellent workability and handleability.
　また、本実施形態のケーブル１０によれば、絶縁電線１１の絶縁体１３は、架橋ポリエチレンから構成されているため、内部被覆層２１および外部被覆層２２が架橋処理されていなくても、絶縁電線１１の耐熱性を十分に維持することができる。 Further, according to the cable 10 of the present embodiment, since the insulator 13 of the insulated wire 11 is made of crosslinked polyethylene, the insulated wire can be used even if the inner coating layer 21 and the outer coating layer 22 are not crosslinked. The heat resistance of 11 can be sufficiently maintained.
　また、本実施形態のケーブル１０によれば、絶縁電線１１の導体１２の断面積は、０．２５ｍｍ２～０．５ｍｍ２であり、外部被覆層２２の厚さは、０．２～０．６ｍｍであるため、線癖低減効果を十分に得ることができる。 Further, according to the cable 10 of the present embodiment, the cross-sectional area of the conductor 12 of the insulated wire 11 is 0.25 mm 2 to 0.5 mm 2 , and the thickness of the outer covering layer 22 is 0.2 to 0. Since it is 6 mm, the effect of reducing wire wrinkles can be sufficiently obtained.
（実施例）
　内部被覆層および外部被覆層が非架橋難燃ポリウレタンからなる本実施形態のケーブルを用いて、線癖評価試験を行った。内部被覆層の硬度は９０度～１００度とし、外部被覆層の硬度は８０度～９０度とした。
　まず、１５０ｍｍの長さに切断されたケーブルを曲げ半径１０ｍｍとなるようにＵ字状に曲げた状態でケーブル両端をテープなどにより固定し、２４時間保持した。その後、ケーブルを解放し、一端を固定した状態でケーブルを吊るし、２４時間経過後の変位量Ｄ（ｍｍ）を測定した（図２参照）。この変移量Ｄが５０ｍｍ以下である場合を線癖評価試験合格とした。 (Example)
A wire rod evaluation test was performed using the cable of this embodiment in which the inner coating layer and the outer coating layer are made of non-crosslinked flame-retardant polyurethane. The hardness of the inner coating layer was 90 to 100 degrees, and the hardness of the outer coating layer was 80 to 90 degrees.
First, a cable cut to a length of 150 mm was bent in a U shape so as to have a bending radius of 10 mm, and both ends of the cable were fixed with tape or the like and held for 24 hours. Thereafter, the cable was released, the cable was suspended with one end fixed, and the displacement D (mm) after 24 hours was measured (see FIG. 2). The case where this transition amount D was 50 mm or less was regarded as passing the wire rod evaluation test.
（比較例）
　比較例として、内部被覆層および外部被覆層が非架橋難燃ポリウレタンからなり、内部被覆層の硬度が８５度で外部被覆層の硬度が９５度または８０度であるケーブルを用いて、実施例と同様に線癖評価試験を行った。 (Comparative example)
As a comparative example, using a cable in which the inner coating layer and the outer coating layer are made of non-crosslinked flame retardant polyurethane, the hardness of the inner coating layer is 85 degrees, and the hardness of the outer coating layer is 95 degrees or 80 degrees, Similarly, a wire rod evaluation test was conducted.
　上記の線癖評価試験の結果を表１に示す。 Table 1 shows the results of the above wire rod evaluation test.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　表１に示すように、架橋処理が不要な非架橋ポリウレタンにより内部被覆層および外部被覆層が構成された実施例１～５では、線癖は許容できる値であった。一方、内部被覆層の硬度が８５度で外部被覆層の硬度が９５度または８０度である比較例１，２においては、実施例に比べて変位量Ｄが大きくなり、線癖の低減を図ることはできなかった。
　以上より、非架橋ポリウレタンからなる内部被覆層および外部被覆層を備え、内部被覆層の硬度が９０度～１００度であり、外部被覆層の硬度が８０度～９０度であり、外部被覆層の硬度が内部被覆層の硬度よりも５度～１０度小さい実施例では、十分な線癖低減効果を得ることが確認できた。 As shown in Table 1, in Examples 1 to 5 in which the inner coating layer and the outer coating layer were made of non-crosslinked polyurethane that does not require a crosslinking treatment, the wire wrinkle was an acceptable value. On the other hand, in Comparative Examples 1 and 2 in which the hardness of the inner coating layer is 85 degrees and the hardness of the outer coating layer is 95 degrees or 80 degrees, the displacement amount D is larger than that of the embodiment, thereby reducing the wire wrinkles. I couldn't.
As described above, the inner coating layer and the outer coating layer made of non-crosslinked polyurethane are provided, the hardness of the inner coating layer is 90 degrees to 100 degrees, the hardness of the outer coating layer is 80 degrees to 90 degrees, In Examples where the hardness was 5 to 10 degrees smaller than the hardness of the inner coating layer, it was confirmed that a sufficient effect of reducing the wrinkle was obtained.
　以上、本発明を詳細にまた特定の実施態様を参照して説明したが、本発明の精神と範囲を逸脱することなく様々な変更や修正を加えることができることは当業者にとって明らかである。また、上記説明した構成部材の数、位置、形状等は上記実施の形態に限定されず、本発明を実施する上で好適な数、位置、形状等に変更することができる。 While the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. In addition, the number, position, shape, and the like of the constituent members described above are not limited to the above-described embodiments, and can be changed to a number, position, shape, and the like that are suitable for implementing the present invention.
　上記実施形態のケーブル１０における絶縁電線１１の本数や配置は、本実施形態に限定されない。ケーブル内に二対以上の絶縁電線が含まれる構成としてもよい。 The number and arrangement of the insulated wires 11 in the cable 10 of the above embodiment are not limited to this embodiment. It is good also as a structure by which two or more pairs of insulated wires are contained in a cable.
　本出願は、２０１３年９月１０日出願の日本特許出願（特願２０１３－１８７６１６）に基づくものであり、その内容はここに参照として取り込まれる。
This application is based on a Japanese patent application filed on September 10, 2013 (Japanese Patent Application No. 2013-187616), the contents of which are incorporated herein by reference.
　１０：ケーブル
　１１：絶縁電線
　１２：導体
　１３：絶縁体
　２１：内部被覆層
　２２：外部被覆層
　Ｒ：曲げ半径
　Ｄ：変位量 10: Cable 11: Insulated wire 12: Conductor 13: Insulator 21: Inner coating layer 22: Outer coating layer R: Bending radius D: Displacement

Claims (4)

  1. 　互いに撚り合わせた一対の絶縁電線と、
    　前記一対の絶縁電線の周囲を覆う非架橋ポリウレタンからなる内部被覆層と、
    　前記内部被覆層の周囲を覆う非架橋ポリウレタンからなる外部被覆層と、を備え、
    　前記内部被覆層の硬度は、ショアＡ硬度で９０度以上１００度以下であり、
    　前記外部被覆層の硬度は、ショアＡ硬度で８０度以上９０度以下であるとともに、前記内部被覆層の硬度よりも５度～１０度小さい、ケーブル。     A pair of insulated wires twisted together;
    An inner covering layer made of non-crosslinked polyurethane covering the periphery of the pair of insulated wires;
    An outer coating layer made of non-crosslinked polyurethane covering the periphery of the inner coating layer,
    The inner coating layer has a Shore A hardness of 90 degrees or more and 100 degrees or less,
    The cable of the outer covering layer has a Shore A hardness of not less than 80 degrees and not more than 90 degrees, and is 5 to 10 degrees smaller than the hardness of the inner covering layer.
  2. 　前記一対の絶縁電線は、それぞれ、導体と、前記導体を覆う絶縁体とを備え、
    　前記絶縁体は、架橋ポリエチレンから構成されている、請求項１に記載のケーブル。     Each of the pair of insulated wires includes a conductor and an insulator covering the conductor,
    The cable according to claim 1, wherein the insulator is made of crosslinked polyethylene.
  3. 　前記導体の断面積は、０．２５ｍｍ２以上０．５ｍｍ２以下である、請求項２に記載のケーブル。 Cross-sectional area of the conductor is 0.25 mm 2 or more 0.5 mm 2 or less, the cable according to claim 2.
  4. 　前記外部被覆層の厚さは、０．２ｍｍ以上０．６ｍｍ以下である、請求項１から請求項３のいずれか一項に記載のケーブル。 The cable according to any one of claims 1 to 3, wherein the outer covering layer has a thickness of 0.2 mm to 0.6 mm.
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JP2010075948A (en) * 2008-09-25 2010-04-08 Daihen Corp Conduit cable
JP2012238438A (en) * 2011-05-11 2012-12-06 Sumitomo Electric Ind Ltd Cable and method for manufacturing the same

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CN1754914B (en) * 2004-09-28 2010-05-26 拜耳（中国）有限公司 Polyurethane composite material, its preparation process and use

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010075948A (en) * 2008-09-25 2010-04-08 Daihen Corp Conduit cable
JP2012238438A (en) * 2011-05-11 2012-12-06 Sumitomo Electric Ind Ltd Cable and method for manufacturing the same

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