JP2012238438A - Cable and method for manufacturing the same - Google Patents

Cable and method for manufacturing the same Download PDF

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JP2012238438A
JP2012238438A JP2011105821A JP2011105821A JP2012238438A JP 2012238438 A JP2012238438 A JP 2012238438A JP 2011105821 A JP2011105821 A JP 2011105821A JP 2011105821 A JP2011105821 A JP 2011105821A JP 2012238438 A JP2012238438 A JP 2012238438A
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sheath
cable
outer diameter
conductor
inner sheath
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JP5810618B2 (en
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Satoshi Hashimoto
智 橋本
Takaya Kobori
孝哉 小堀
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Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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Priority to JP2011105821A priority Critical patent/JP5810618B2/en
Priority to CN201280011919XA priority patent/CN103415897A/en
Priority to PCT/JP2012/061845 priority patent/WO2012153756A1/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
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/187—Sheaths comprising extruded non-metallic layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/24—Sheathing; Armouring; Screening; Applying other protective layers by extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/06—Rod-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • 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
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/1895—Internal space filling-up means

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  • Insulated Conductors (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a cable which thins its diameter while adequately maintaining appearance, breaking strength and voltage resistance, and further is manufactured while reducing a cost, and to provide a method for manufacturing the same.SOLUTION: The cable 10 is formed by covering a circumference of a pair of insulation wires 1 that are twisted each other, with a sheath 6. The insulation wire 1 is formed by covering a conductor 4 that has a cross-section area of 0.18 mmor more but 0.30 mmor less and is made of a tin copper alloy, with an insulating body 5 of crosslinked polyethylene. The sheath 6 comprises an inner sheath 2 that is extruded so as to cover the circumference of the pair of the insulation wires 1 and made of non-crosslinked polyurethane, and an external sheath 3 that is extruded so as to cover a circumference of the inner sheath 2 and made of non-crosslinked polyurethane. The sheath 6 has a thickness of 0.5 mm or more and an outer diameter of 4.0 mm or less.

Description

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及びその製造方法に関する。   The present invention relates to a cable having a pair of insulated wires twisted together and a method for manufacturing the same.

アンチロックブレーキシステム（ＡＢＳ）などの各種制御システムにおいて、車輪速センサで発生した信号を伝送するＡＢＳセンサケーブルとして、２本の絶縁電線を撚り合わせ、外周をシースで覆った構造のものが使用されている。
この種のケーブルとしては、内部シースを、ポリオレフィン系樹脂または該樹脂を主体とする樹脂組成物から構成し、外部シースを、熱可塑性ポリウレタンエラストマーと熱可塑性ポリエステルエラストマーの混合物または該混合物を主体とする樹脂組成物の架橋体から構成し、かつ外部シースが、金属水酸化物および窒素系難燃剤から選ばれる１種または２種以上の難燃剤を、架橋体１００重量部に対し、３〜３５重量部を含むものが知られている（例えば、特許文献１参照）。 In various control systems such as anti-lock brake systems (ABS), ABS sensor cables that transmit signals generated by wheel speed sensors have a structure in which two insulated wires are twisted together and the outer periphery is covered with a sheath. ing.
In this type of cable, the inner sheath is composed of a polyolefin resin or a resin composition mainly composed of the resin, and the outer sheath is mainly composed of a mixture of a thermoplastic polyurethane elastomer and a thermoplastic polyester elastomer or the mixture. The resin composition is composed of a crosslinked product, and the outer sheath contains 1 to 2 or more flame retardants selected from metal hydroxides and nitrogen-based flame retardants in an amount of 3 to 35 weights with respect to 100 parts by weight of the crosslinked product. The thing containing a part is known (for example, refer patent document 1).

国際公開第２００５／０１３２９１号パンフレットInternational Publication No. 2005/013291 Pamphlet

上記ケーブルに対しては、狭隘なスペースへの配線を可能とすべく、さらなる細径化が要求されているが、この細径化の要求とともに、外観、破断強度及び耐電圧を良好に維持しつつコストを抑制することも要求されている。   The cable is required to be further reduced in diameter in order to enable wiring in a narrow space. At the same time, the appearance, breaking strength and withstand voltage are maintained well. However, it is also required to reduce costs.

本発明の目的は、外観、破断強度及び耐電圧を良好に維持しつつ細径にして、なおかつコストを抑制したケーブル及びその製造方法を提供することにある。   An object of the present invention is to provide a cable having a small diameter while maintaining good appearance, breaking strength, and withstand voltage, and a method for manufacturing the same, with reduced cost.

上記課題を解決することのできる本発明のケーブルは、互いに撚り合わされた一対の絶縁電線の周囲をシースで覆ったケーブルであって、
前記絶縁電線は、断面積が０．１８ｍｍ２以上０．３０ｍｍ２以下の錫銅合金からなる導体を架橋ポリエチレンで被覆してなり、
前記シースは、一対の前記絶縁電線の周囲に押出被覆された非架橋ポリウレタンからなる内部シースと、前記内部シースの周囲に押出被覆された非架橋ポリウレタンからなる外部シースとを有し、
前記シースの厚さが０．５ｍｍ以上であり、前記シースの外径が４．０ｍｍ以下であることを特徴とする。 The cable of the present invention that can solve the above-mentioned problems is a cable in which the periphery of a pair of insulated wires twisted together is covered with a sheath,
The insulated wire is made by coating a conductor cross-sectional area consist of 0.18 mm 2 or more 0.30 mm 2 or less of tin copper alloy XLPE,
The sheath has an inner sheath made of non-crosslinked polyurethane that is extrusion-coated around a pair of insulated wires, and an outer sheath made of non-crosslinked polyurethane that is extrusion-coated around the inner sheath,
The sheath has a thickness of 0.5 mm or more, and an outer diameter of the sheath is 4.0 mm or less.

また、本発明のケーブルの製造方法は、互いに撚り合わされた一対の絶縁電線の周囲をシースで覆ったケーブルの製造方法であって、
断面積が０．１８ｍｍ２以上０．３０ｍｍ２以下の錫銅合金からなる導体を架橋ポリエチレンで被覆してなる一対の絶縁電線を互いに撚り合わせ、
撚り合わせた一対の前記絶縁電線の周囲に非架橋ポリウレタンを押出被覆して内部シースを形成し、
その後、前記内部シースの周囲に前記内部シースと同じ非架橋ポリウレタンを押出被覆して外部シースを形成することで、前記内部シースと前記外部シースとからなる厚さ０．５ｍｍ以上かつ外径４．０ｍｍ以下の前記シースを形成することを特徴とする。 The cable manufacturing method of the present invention is a cable manufacturing method in which a sheath is covered with a sheath around a pair of insulated wires twisted together.
Cross-sectional area 0.18 mm 2 or more 0.30 mm 2 or less of a conductor made of tin copper alloy twisted pair of insulated wires formed by coating with cross-linked polyethylene with each other,
A non-crosslinked polyurethane is extrusion-coated around a pair of twisted insulated wires to form an inner sheath,
Thereafter, the outer sheath is formed by extrusion coating the same non-crosslinked polyurethane as that of the inner sheath around the inner sheath, so that the thickness of the inner sheath and the outer sheath is 0.5 mm or more and the outer diameter is 4. The sheath of 0 mm or less is formed.

本発明のケーブルによれば、絶縁電線の導体が錫銅合金からなることにより、導体の断面積を０．１８ｍｍ２以上０．３０ｍｍ２以下としても十分な破断強度を得ることができる。また、導体の断面積を小さくすることができるので、架橋ポリエチレンからなる絶縁被覆の厚さを十分に確保して良好な耐電圧を維持しつつ、ケーブル外径を４．０ｍｍ以下として細径にすることができる。また、絶縁電線を被覆する内部シースと外部シースとからなるシースを安価な非架橋ポリウレタンにより形成したので、ケーブルのコストを抑制することができる。しかも、絶縁電線の周囲に押出被覆した内部シースに対して、その周囲に外部シースを押出被覆し、シースの厚さを０．５ｍｍ以上に確保しているので、撚り合わせた絶縁電線の外形が撚り波として外部シース表面に現れるようなこともなく、良好な外観を確保することができる。 According to the cable of the present invention, by a conductor of the insulated wire is made of tin-copper alloy, it is possible to obtain a sufficient breaking strength the cross-sectional area of the conductor as 0.18 mm 2 or more 0.30 mm 2 or less. Moreover, since the cross-sectional area of the conductor can be reduced, the outer diameter of the cable is reduced to 4.0 mm or less while sufficiently securing the thickness of the insulating coating made of cross-linked polyethylene and maintaining good withstand voltage. can do. Moreover, since the sheath which consists of an inner sheath and an outer sheath which coat | cover an insulated wire was formed with the cheap non-crosslinked polyurethane, the cost of a cable can be suppressed. In addition, the outer sheath is extrusion coated on the periphery of the insulated wire, and the sheath has a thickness of 0.5 mm or more. A good appearance can be ensured without appearing on the outer sheath surface as a twisted wave.

本発明に係るケーブルの一実施形態を示す断面図である。It is sectional drawing which shows one Embodiment of the cable which concerns on this invention.

以下、本発明に係るケーブルの実施の形態の例を、図面を参照して説明する。
図１に示すように、本実施形態に係るケーブル１０は、一対の絶縁電線１を有しており、その外径は４．０ｍｍ以下であり細径である。 Hereinafter, an example of an embodiment of a cable according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the cable 10 according to the present embodiment has a pair of insulated wires 1 whose outer diameter is 4.0 mm or less and a small diameter.

このケーブル１０は、例えば、ＡＢＳなどの各種制御システムにおいて、車輪速センサで発生した信号を伝送するＡＢＳセンサケーブルとして用いられる。なお、ケーブル１０は、ＡＢＳセンサケーブル以外にも使用可能である。
このケーブル１０を構成する絶縁電線１は、導体４とその外周を覆う絶縁体５からなるものであり、互いに撚り合わせられている。 This cable 10 is used as an ABS sensor cable for transmitting a signal generated by a wheel speed sensor in various control systems such as ABS. The cable 10 can be used other than the ABS sensor cable.
An insulated wire 1 constituting the cable 10 is composed of a conductor 4 and an insulator 5 covering its outer periphery, and is twisted together.

導体４は、錫銅合金からなるものであり、その断面積は０．１８ｍｍ２以上０．３０ｍｍ２以下である。なお、導体４の錫銅合金における錫の濃度は０．２質量％以上０．６質量％以下である。 Conductor 4 is made of a tin-copper alloy, the cross-sectional area is 0.18 mm 2 or more 0.30 mm 2 or less. In addition, the density | concentration of the tin in the tin copper alloy of the conductor 4 is 0.2 mass% or more and 0.6 mass% or less.

この導体４は、例えば、外径０．０８ｍｍの素線を複数本撚り合わせた撚線である。この導体４を構成する素線の本数としては、例えば、３６本、４８本あるいは６０本程度であり、導体４の外径は、素線の本数が３６本の場合で０．５７ｍｍ、素線の本数が４８本の場合で０．６５ｍｍ、素線の本数が６０本の場合で０．７２ｍｍである。   The conductor 4 is, for example, a stranded wire obtained by twisting a plurality of strands having an outer diameter of 0.08 mm. The number of strands constituting the conductor 4 is, for example, about 36, 48, or 60, and the outer diameter of the conductor 4 is 0.57 mm when the number of strands is 36, When the number of wires is 48, it is 0.65 mm, and when the number of strands is 60, it is 0.72 mm.

導体４を覆う絶縁体５は、架橋ポリエチレンから形成されている。この絶縁体５の厚さは、素線の本数が３６本の場合で０．３２ｍｍ、素線の本数が４８本の場合で０．３８ｍｍ、素線の本数が６０本の場合で０．３７ｍｍである。また、絶縁体５の外径は、素線の本数が３６本の場合で１．２０ｍｍ、素線の本数が４８本の場合で１．４０ｍｍ、素線の本数が６０本の場合で１．４５ｍｍである。   The insulator 5 covering the conductor 4 is made of cross-linked polyethylene. The thickness of the insulator 5 is 0.32 mm when the number of strands is 36, 0.38 mm when the number of strands is 48, and 0.37 mm when the number of strands is 60 It is. The outer diameter of the insulator 5 is 1.20 mm when the number of strands is 36, 1.40 mm when the number of strands is 48, and 1.1 when the number of strands is 60. 45 mm.

一対の絶縁電線１の周囲は、シース６によって覆われている。シース６は、内部シース２と外部シース３からなる二層構造になっている。
内部シース２は、一対の絶縁電線１の周囲に押出被覆されたものであり、非架橋ポリウレタン（ポリウレタンエラストマー）から形成されている。内部シース２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も有する。
外部シース３は、内部シース２の周囲に押出被覆されたものであり、内部シース２と同一材料である非架橋ポリウレタン（ポリウレタンエラストマー）から形成されている。 The periphery of the pair of insulated wires 1 is covered with a sheath 6. The sheath 6 has a two-layer structure including an inner sheath 2 and an outer sheath 3.
The inner sheath 2 is extrusion-coated around a pair of insulated wires 1 and is formed from non-crosslinked polyurethane (polyurethane elastomer). The inner sheath 2 also has a function of improving the roundness in the cross section of the cable 10.
The outer sheath 3 is extrusion-coated around the inner sheath 2 and is formed of non-crosslinked polyurethane (polyurethane elastomer) that is the same material as the inner sheath 2.

これらの内部シース２及び外部シース３から構成されたシース６は、その厚さ（内部シース２と外部シース３の合計厚さ）Ｔが０．５ｍｍ以上になるように形成されている。   The sheath 6 composed of the inner sheath 2 and the outer sheath 3 is formed so that its thickness (total thickness of the inner sheath 2 and the outer sheath 3) T is 0.5 mm or more.

次に、上記のケーブル１０を製造する方法について説明する。
まず、一対の絶縁電線１を互いに撚り合わせ、撚り合わせた一対の絶縁電線１の周囲に、非架橋ポリウレタンを押出被覆することにより、内部シース２を形成する。内部シース２を形成することにより、絶縁電線１を撚り合わせた表面の凹凸（撚り波）が埋められて断面略円形の丸線形状になる。
次に、内部シース２の周囲に、内部シース２と同じ非架橋ポリウレタンを押出被覆することにより、外部シース３を形成する。 Next, a method for manufacturing the cable 10 will be described.
First, a pair of insulated wires 1 are twisted together, and an inner sheath 2 is formed by extrusion-coating non-crosslinked polyurethane around the twisted pair of insulated wires 1. By forming the inner sheath 2, the unevenness (twisted wave) on the surface where the insulated wires 1 are twisted together is filled to form a round wire having a substantially circular cross section.
Next, the outer sheath 3 is formed by extrusion coating the same non-crosslinked polyurethane as the inner sheath 2 around the inner sheath 2.

外部シース３の押出被覆は、内部シース２が硬化した後に行う。内部シース２が冷却されて硬化してから、外部シース３を押出被覆する。これにより、内部シース２と外部シース３とからなる厚さ０．５ｍｍ以上のシース６によって一対の絶縁電線１を被覆し、外径４．０ｍｍ以下のケーブル１０とする。   Extrusion coating of the outer sheath 3 is performed after the inner sheath 2 is cured. After the inner sheath 2 is cooled and hardened, the outer sheath 3 is extrusion coated. As a result, the pair of insulated wires 1 are covered with the sheath 6 having a thickness of 0.5 mm or more made of the inner sheath 2 and the outer sheath 3, thereby forming the cable 10 having an outer diameter of 4.0 mm or less.

なお、内部シース２が十分に硬化していないうちに外部シース３を押出被覆すると、内部シース２の樹脂と外部シース３の樹脂を同時に押出した状態に近くなってしまう。つまり、内部シース２の樹脂と外部シース３の樹脂がそれぞれ軟化したままで共に変形してしまい、外部シース３の表面が絶縁電線１を撚り合わせた凹凸形状に沿って変形してしまうおそれがある。内部シース２をある程度硬化させてから外部シース３を押出被覆することで、絶縁電線１を撚り合わせた凹凸形状の影響を受けずに外部シース３を形成することができる。   If the outer sheath 3 is extrusion coated while the inner sheath 2 is not sufficiently cured, the resin in the inner sheath 2 and the resin in the outer sheath 3 are almost simultaneously extruded. That is, the resin of the inner sheath 2 and the resin of the outer sheath 3 are both deformed while being softened, and the surface of the outer sheath 3 may be deformed along the uneven shape formed by twisting the insulated wires 1 together. . By externally covering the outer sheath 3 after the inner sheath 2 is cured to some extent, the outer sheath 3 can be formed without being affected by the irregular shape formed by twisting the insulated wire 1.

上記実施形態によれば、導体４が錫銅合金からなる絶縁電線１を備えることにより、導体４の断面積を０．１８ｍｍ２以上０．３０ｍｍ２以下としても十分な破断強度を得ることができる。また、導体４の断面積を小さくすることができるので、架橋ポリエチレン製の絶縁体５からなる被覆の厚さを十分に確保して良好な耐電圧性を維持しつつ、ケーブル外径を４．０ｍｍ以下として細径化を図ることができる。 According to the embodiment, by providing the insulated wire 1 conductor 4 is made of tin-copper alloy, it is possible to obtain a sufficient breaking strength the cross-sectional area of the conductor 4 as 0.18 mm 2 or more 0.30 mm 2 or less . Further, since the cross-sectional area of the conductor 4 can be reduced, the outer diameter of the cable can be reduced by 4 while ensuring a sufficient thickness of the coating made of the insulator 5 made of crosslinked polyethylene and maintaining good voltage resistance. The diameter can be reduced to 0 mm or less.

また、ケーブル１０では、内部シース２及び外部シース３からなるシース６を、金属水酸化物または窒素系難燃材（メラミンシアヌレートなど）を混入せずに、安価な非架橋ポリウレタンから形成している。したがって、ケーブル１０のコストを低く抑えることができる。   In the cable 10, the sheath 6 composed of the inner sheath 2 and the outer sheath 3 is formed from inexpensive non-crosslinked polyurethane without mixing metal hydroxide or nitrogen-based flame retardant (such as melamine cyanurate). Yes. Therefore, the cost of the cable 10 can be kept low.

シース６を非架橋ポリウレタンの一層構造とすると、撚り合わせた絶縁電線１の外形が撚り波として外部に現れるおそれがある。本実施形態では、撚り合わせた絶縁電線１の周囲に内部シース２を押出被覆し、さらに、その内部シース２の周囲に外部シース３を押出被覆することで、シース６を二層構造とし、その厚さＴを０．５ｍｍ以上に確保している。これにより、撚り合わせた絶縁電線１の外形が撚り波としてケーブル１０の外表面に現れるようなこともなく、良好な外観を確保することができる。   If the sheath 6 has a single-layer structure of non-crosslinked polyurethane, the external shape of the twisted insulated electric wire 1 may appear outside as a twisted wave. In the present embodiment, the sheath 6 is formed into a two-layer structure by extrusion coating the inner sheath 2 around the twisted insulated wire 1 and further extruding the outer sheath 3 around the inner sheath 2. The thickness T is secured to 0.5 mm or more. Thereby, the external appearance of the insulated electric wire 1 twisted together does not appear on the outer surface of the cable 10 as a twisted wave, and a favorable external appearance can be ensured.

互いに撚り合わせた一対の絶縁電線の外周をシースで被覆した各種（表１参照）のケーブルを製造し、それぞれのケーブルについて、絶縁電線の耐電圧、外観観察、破断強度を評価した。   Various types of cables (see Table 1) in which the outer periphery of a pair of insulated wires twisted together were covered with a sheath were manufactured, and the withstand voltage, appearance observation, and breaking strength of the insulated wires were evaluated for each cable.

Figure 2012238438
Figure 2012238438

〈試験対象ケーブル〉
（実施例１）
（１）ケーブル外径：４．０ｍｍ
（２）導体
導体サイズ：０．３０ｍｍ２、導体構成：外径０．０８ｍｍの素線を６０本撚り合わせた撚線、材質：錫銅合金、撚外径：０．７２ｍｍ
（３）絶縁体
材質：架橋難燃ポリエチレン、平均厚：０．３７ｍｍ、外径：１．４５ｍｍ
（４）シース
（４−１）内部シース
材質：非架橋ポリウレタン（ポリウレタンエラストマー）、平均厚：０．３０ｍｍ、外径：３．５０ｍｍ
（４−２）外部シース
材質：非架橋ポリウレタン（ポリウレタンエラストマー）、平均厚：０．２５ｍｍ、外径：４．０ｍｍ <Cable to be tested>
Example 1
(1) Cable outer diameter: 4.0mm
(2) Conductor Conductor size: 0.30 mm 2 , Conductor configuration: Twisted strand of 60 strands having an outer diameter of 0.08 mm, Material: Tin-copper alloy, Twist outer diameter: 0.72 mm
(3) Insulator Material: Cross-linked flame retardant polyethylene, average thickness: 0.37 mm, outer diameter: 1.45 mm
(4) Sheath (4-1) Inner sheath Material: Non-crosslinked polyurethane (polyurethane elastomer), average thickness: 0.30 mm, outer diameter: 3.50 mm
(4-2) External sheath Material: Non-crosslinked polyurethane (polyurethane elastomer), average thickness: 0.25 mm, outer diameter: 4.0 mm

（実施例２）
（１）ケーブル外径：４．０ｍｍ
（２）導体
導体サイズ：０．２５ｍｍ２、導体構成：外径０．０８ｍｍの素線を４８本撚り合わせた撚線、材質：錫銅合金、撚外径：０．６５ｍｍ
（３）絶縁体
材質：架橋難燃ポリエチレン、平均厚：０．３８ｍｍ、外径：１．４０ｍｍ
（４）シース
（４−１）内部シース
材質：非架橋ポリウレタン（ポリウレタンエラストマー）、平均厚：０．３０ｍｍ、外径：３．４０ｍｍ
（４−２）外部シース
材質：非架橋ポリウレタン（ポリウレタンエラストマー）、平均厚：０．３０ｍｍ、外径：４．０ｍｍ (Example 2)
(1) Cable outer diameter: 4.0mm
(2) Conductor Conductor size: 0.25 mm 2 , Conductor configuration: twisted wire obtained by twisting 48 strands having an outer diameter of 0.08 mm, material: tin copper alloy, twisted outer diameter: 0.65 mm
(3) Insulator Material: Cross-linked flame retardant polyethylene, average thickness: 0.38 mm, outer diameter: 1.40 mm
(4) Sheath (4-1) Inner sheath Material: Non-crosslinked polyurethane (polyurethane elastomer), average thickness: 0.30 mm, outer diameter: 3.40 mm
(4-2) External sheath Material: Non-crosslinked polyurethane (polyurethane elastomer), average thickness: 0.30 mm, outer diameter: 4.0 mm

（実施例３）
（１）ケーブル外径：３．４ｍｍ
（２）導体
導体サイズ：０．１８ｍｍ２、導体構成：外径０．０８ｍｍの素線を３６本撚り合わせた撚線、材質：錫銅合金、撚外径：０．５７ｍｍ
（３）絶縁体
材質：架橋難燃ポリエチレン、平均厚：０．３２ｍｍ、外径：１．２０ｍｍ
（４）シース
（４−１）内部シース
材質：非架橋ポリウレタン（ポリウレタンエラストマー）、平均厚：０．２５ｍｍ、外径：２．９０ｍｍ
（４−２）外部シース
材質：非架橋ポリウレタン（ポリウレタンエラストマー）、平均厚：０．２５ｍｍ、外径：３．４ｍｍ (Example 3)
(1) Cable outer diameter: 3.4mm
(2) Conductor Conductor size: 0.18 mm 2 , Conductor configuration: Stranded wire obtained by twisting 36 strands having an outer diameter of 0.08 mm, Material: Tin-copper alloy, Twist outer diameter: 0.57 mm
(3) Insulator Material: Cross-linked flame retardant polyethylene, average thickness: 0.32 mm, outer diameter: 1.20 mm
(4) Sheath (4-1) Inner sheath Material: Non-crosslinked polyurethane (polyurethane elastomer), average thickness: 0.25 mm, outer diameter: 2.90 mm
(4-2) External sheath Material: Non-crosslinked polyurethane (polyurethane elastomer), average thickness: 0.25 mm, outer diameter: 3.4 mm

（比較例１）
（１）ケーブル外径：４．０ｍｍ
（２）導体
導体サイズ：０．３０ｍｍ２、導体構成：外径０．０８ｍｍの素線を６０本撚り合わせた撚線、材質：錫銅合金、撚外径：０．７２ｍｍ
（３）絶縁体
材質：架橋難燃ポリエチレン、平均厚：０．３７ｍｍ、外径：１．４５ｍｍ
（４）シース（一層構造）
材質：非架橋ポリウレタン（ポリウレタンエラストマー）、平均厚：０．５５ｍｍ、外径：４．０ｍｍ (Comparative Example 1)
(1) Cable outer diameter: 4.0mm
(2) Conductor Conductor size: 0.30 mm 2 , Conductor configuration: Twisted strand of 60 strands having an outer diameter of 0.08 mm, Material: Tin-copper alloy, Twist outer diameter: 0.72 mm
(3) Insulator Material: Cross-linked flame retardant polyethylene, average thickness: 0.37 mm, outer diameter: 1.45 mm
(4) Sheath (single layer structure)
Material: non-crosslinked polyurethane (polyurethane elastomer), average thickness: 0.55 mm, outer diameter: 4.0 mm

（比較例２）
（１）ケーブル外径：４．０ｍｍ
（２）導体
導体サイズ：０．２５ｍｍ２、導体構成：外径０．０８ｍｍの素線を４８本撚り合わせた撚線、材質：錫銅合金、撚外径：０．６５ｍｍ
（３）絶縁体
材質：架橋難燃ポリエチレン、平均厚：０．３８ｍｍ、外径：１．４０ｍｍ
（４）シース（一層構造）
材質：非架橋ポリウレタン（ポリウレタンエラストマー）、平均厚：０．６０ｍｍ、外径：４．０ｍｍ (Comparative Example 2)
(1) Cable outer diameter: 4.0mm
(2) Conductor Conductor size: 0.25 mm 2 , Conductor configuration: twisted wire obtained by twisting 48 strands having an outer diameter of 0.08 mm, material: tin copper alloy, twisted outer diameter: 0.65 mm
(3) Insulator Material: Cross-linked flame retardant polyethylene, average thickness: 0.38 mm, outer diameter: 1.40 mm
(4) Sheath (single layer structure)
Material: Non-crosslinked polyurethane (polyurethane elastomer), average thickness: 0.60 mm, outer diameter: 4.0 mm

（比較例３）
（１）ケーブル外径：４．０ｍｍ
（２）導体
導体サイズ：０．３５ｍｍ２、導体構成：外径０．１６ｍｍの素線を１９本撚り合わせた撚線、材質：軟銅、撚外径：０．８５ｍｍ
（３）絶縁体
材質：架橋難燃ポリエチレン、平均厚：０．３０ｍｍ、外径：１．４５ｍｍ
（４）シース
（４−１）内部シース
材質：非架橋ポリウレタン（ポリウレタンエラストマー）、平均厚：０．３０ｍｍ、外径：３．５０ｍｍ
（４−２）外部シース
材質：非架橋ポリウレタン（ポリウレタンエラストマー）、平均厚：０．２５ｍｍ、外径：４．０ｍｍ (Comparative Example 3)
(1) Cable outer diameter: 4.0mm
(2) Conductor Conductor size: 0.35 mm 2 , Conductor configuration: twisted wire obtained by twisting 19 strands having an outer diameter of 0.16 mm, material: annealed copper, twisted outer diameter: 0.85 mm
(3) Insulator Material: Cross-linked flame retardant polyethylene, average thickness: 0.30 mm, outer diameter: 1.45 mm
(4) Sheath (4-1) Inner sheath Material: Non-crosslinked polyurethane (polyurethane elastomer), average thickness: 0.30 mm, outer diameter: 3.50 mm
(4-2) External sheath Material: Non-crosslinked polyurethane (polyurethane elastomer), average thickness: 0.25 mm, outer diameter: 4.0 mm

（比較例４）
（１）ケーブル外径：４．０ｍｍ
（２）導体
導体サイズ：０．５０ｍｍ２、導体構成：外径０．１６ｍｍの素線を２８本撚り合わせた撚線、材質：軟銅、撚外径：１．００ｍｍ
（３）絶縁体
材質：架橋難燃ポリエチレン、平均厚：０．３３ｍｍ、外径：１．６５ｍｍ
（４）シース
（４−１）内部シース
材質：非架橋ポリウレタン（ポリウレタンエラストマー）、平均厚：０．２５ｍｍ、外径：３．８０ｍｍ
（４−２）外部シース
材質：非架橋ポリウレタン（ポリウレタンエラストマー）、平均厚：０．１０ｍｍ、外径：４．０ｍｍ (Comparative Example 4)
(1) Cable outer diameter: 4.0mm
(2) Conductor Conductor size: 0.50 mm 2 , Conductor configuration: stranded wire in which 28 strands having an outer diameter of 0.16 mm are twisted together, material: annealed copper, twisted outer diameter: 1.00 mm
(3) Insulator Material: Cross-linked flame retardant polyethylene, average thickness: 0.33 mm, outer diameter: 1.65 mm
(4) Sheath (4-1) Inner sheath Material: Non-crosslinked polyurethane (polyurethane elastomer), average thickness: 0.25 mm, outer diameter: 3.80 mm
(4-2) External sheath Material: Non-crosslinked polyurethane (polyurethane elastomer), average thickness: 0.10 mm, outer diameter: 4.0 mm

（比較例５）
（１）ケーブル外径：４．０ｍｍ
（２）導体
導体サイズ：０．５０ｍｍ２、導体構成：外径０．１６ｍｍの素線を２８本撚り合わせた撚線、材質：軟銅、撚外径：１．００ｍｍ
（３）絶縁体
材質：架橋難燃ポリエチレン、平均厚：０．２３ｍｍ、外径：１．４５ｍｍ
（４）シース
（４−１）内部シース
材質：非架橋ポリウレタン（ポリウレタンエラストマー）、平均厚：０．３０ｍｍ、外径：３．５０ｍｍ
（４−２）外部シース
材質：非架橋ポリウレタン（ポリウレタンエラストマー）、平均厚：０．２５ｍｍ、外径：４．０ｍｍ (Comparative Example 5)
(1) Cable outer diameter: 4.0mm
(2) Conductor Conductor size: 0.50 mm 2 , Conductor configuration: stranded wire in which 28 strands having an outer diameter of 0.16 mm are twisted together, material: annealed copper, twisted outer diameter: 1.00 mm
(3) Insulator Material: Cross-linked flame retardant polyethylene, average thickness: 0.23 mm, outer diameter: 1.45 mm
(4) Sheath (4-1) Inner sheath Material: Non-crosslinked polyurethane (polyurethane elastomer), average thickness: 0.30 mm, outer diameter: 3.50 mm
(4-2) External sheath Material: Non-crosslinked polyurethane (polyurethane elastomer), average thickness: 0.25 mm, outer diameter: 4.0 mm

（比較例６）
（１）ケーブル外径：４．３ｍｍ
（２）導体
導体サイズ：０．５０ｍｍ２、導体構成：外径０．１６ｍｍの素線を２８本撚り合わせた撚線、材質：軟銅、撚外径：１．００ｍｍ
（３）絶縁体
材質：架橋難燃ポリエチレン、平均厚：０．３３ｍｍ、外径：１．６５ｍｍ
（４）シース
（４−１）内部シース
材質：非架橋ポリウレタン（ポリウレタンエラストマー）、平均厚：０．２５ｍｍ、外径：３．８０ｍｍ
（４−２）外部シース
材質：非架橋ポリウレタン（ポリウレタンエラストマー）、平均厚：０．２５ｍｍ、外径：４．３ｍｍ (Comparative Example 6)
(1) Cable outer diameter: 4.3mm
(2) Conductor Conductor size: 0.50 mm 2 , Conductor configuration: stranded wire in which 28 strands having an outer diameter of 0.16 mm are twisted together, material: annealed copper, twisted outer diameter: 1.00 mm
(3) Insulator Material: Cross-linked flame retardant polyethylene, average thickness: 0.33 mm, outer diameter: 1.65 mm
(4) Sheath (4-1) Inner sheath Material: Non-crosslinked polyurethane (polyurethane elastomer), average thickness: 0.25 mm, outer diameter: 3.80 mm
(4-2) External sheath Material: Non-crosslinked polyurethane (polyurethane elastomer), average thickness: 0.25 mm, outer diameter: 4.3 mm

〈評価試験方法〉
（１）絶縁電線の耐電圧
絶縁電線に対して５ｋＶの電圧を０．１５秒間印加し、１ｋｍ中に生じる欠陥回数を検出した。
（２）外観観察
製造したケーブルを目視で観察し、互いに撚り合わせた絶縁電線の撚り波がケーブルの外表面に現れているか否かを判定した。
（３）破断強度
ケーブルに張力を加え、ケーブルが破断したときの引張力を測定した。破断強度が３００Ｎ以上であるものを合格と判定した。 <Evaluation test method>
(1) Withstand voltage of insulated wire A voltage of 5 kV was applied to the insulated wire for 0.15 seconds, and the number of defects occurring in 1 km was detected.
(2) External appearance observation The manufactured cable was observed visually and it was determined whether the twist wave of the insulated wire twisted together appeared on the outer surface of the cable.
(3) Breaking strength Tension was applied to the cable, and the tensile force when the cable broke was measured. Those having a breaking strength of 300 N or more were determined to be acceptable.

（評価試験結果）
上記の評価試験の結果を表２に示す。 (Evaluation test results)
The results of the above evaluation test are shown in Table 2.

Figure 2012238438
Figure 2012238438

（実施例１〜３）
実施例１〜３では、絶縁電線の耐電圧試験による欠陥は何れも検出されず、また、外表面に撚り波が現れることもなかった。また、錫銅合金からなる素線から導体を構成したことにより、導体サイズ（断面積）を小さく（０．３０ｍｍ２，０．２５ｍｍ２，０．１８ｍｍ２）してケーブルを細径にしても、３００Ｎ以上の破断強度が得られた。 (Examples 1-3)
In Examples 1 to 3, no defects in the withstand voltage test of the insulated wires were detected, and no twist wave appeared on the outer surface. Further, by constructing the conductor from wire consisting of tin-copper alloy, conductor size smaller (cross-sectional area) (0.30mm 2, 0.25mm 2, 0.18mm 2) even when the cable diameter to A breaking strength of 300 N or more was obtained.

（比較例１，２）
比較例１，２では、絶縁電線の耐電圧試験による欠陥は何れも検出されず、また、錫銅合金からなる素線から導体を構成したことにより、導体サイズ（断面積）を小さく（０．３０ｍｍ２，０．２５ｍｍ２）してケーブルを細径にしても、３００Ｎ以上の破断強度が得られた。しかし、これらの比較例１，２ではシースを一層構造としているため、シースの厚さを変化させても、外表面に撚り波が現れた。 (Comparative Examples 1 and 2)
In Comparative Examples 1 and 2, no defects in the withstand voltage test of the insulated wires were detected, and the conductor was made of a strand made of a tin-copper alloy, thereby reducing the conductor size (cross-sectional area) (0. 30 mm 2 , 0.25 mm 2 ) and a cable having a small diameter, a breaking strength of 300 N or more was obtained. However, in these comparative examples 1 and 2, since the sheath has a single-layer structure, a twist wave appeared on the outer surface even when the thickness of the sheath was changed.

（比較例３）
比較例３では、絶縁電線の耐電圧試験による欠陥は検出されず、また、外表面に撚り波が現れることもなかった。しかし、軟銅からなる素線から導体を構成したことにより、導体サイズ（断面積）が０．３５ｍｍ２程度では、３００Ｎ以上の破断強度を得ることができなかった。 (Comparative Example 3)
In Comparative Example 3, no defect was detected in the withstand voltage test of the insulated wire, and no twist wave appeared on the outer surface. However, since the conductor is made of a strand made of annealed copper, a breaking strength of 300 N or more could not be obtained when the conductor size (cross-sectional area) was about 0.35 mm 2 .

（比較例４）
比較例４では、絶縁電線の耐電圧試験による欠陥は検出されなかった。また、破断強度は３００Ｎ以上であった。しかし、破断強度を３００Ｎ以上とするために導体サイズ（断面積）をかなり大きく（０．５０ｍｍ２）せざるを得ず、外径を４．０ｍｍに抑えるために、外部シースの厚さが薄くなり（０．１０ｍｍ）、外表面に撚り波が現れた。 (Comparative Example 4)
In Comparative Example 4, no defect was detected in the withstand voltage test of the insulated wire. Moreover, the breaking strength was 300 N or more. However, in order to make the breaking strength 300 N or more, the conductor size (cross-sectional area) has to be considerably large (0.50 mm 2 ), and in order to keep the outer diameter to 4.0 mm, the thickness of the outer sheath is thin. The twisted wave appeared on the outer surface.

（比較例５）
比較例５では、外表面に撚り波が現れることはなく、また、破断強度は３００Ｎ以上であった。しかし、破断強度を３００Ｎ以上とするために導体サイズ（断面積）をかなり大きく（０．５０ｍｍ２）し、さらに、外部シースの厚さを十分に確保して外表面における撚り波の発生を抑えたために、絶縁電線の絶縁体の厚さが薄くなり、絶縁電線の耐電圧試験では複数回（４回）の欠陥が生じた。 (Comparative Example 5)
In Comparative Example 5, no twist wave appeared on the outer surface, and the breaking strength was 300 N or more. However, the conductor size (cross-sectional area) is considerably large (0.50 mm 2 ) in order to make the breaking strength 300 N or more, and the thickness of the outer sheath is sufficiently secured to suppress the generation of twisting waves on the outer surface. For this reason, the insulation of the insulated wire became thinner, and a defect was generated a plurality of times (four times) in the withstand voltage test of the insulated wire.

（比較例６）
比較例６では、絶縁電線の耐電圧試験による欠陥は検出されず、また、外表面に撚り波が現れることもなかった。また、３００Ｎ以上の破断強度も得られた。しかし、この比較例６では、十分な耐電圧を確保し、外表面における撚り波の発生を抑え、さらに、十分な破断強度を得るために絶縁電線の絶縁体の厚さ及び外部シースの厚さを十分に確保し、しかも、導体サイズ（断面積）をかなり大きく（０．５０ｍｍ２）せざるを得なかった。そのため、この比較例６の構造では、ケーブルの外径が４．３ｍｍとなり、細径にすることは困難であった。 (Comparative Example 6)
In Comparative Example 6, no defect was detected in the withstand voltage test of the insulated wire, and no twist wave appeared on the outer surface. Moreover, the breaking strength of 300 N or more was also obtained. However, in this comparative example 6, in order to ensure a sufficient withstand voltage, to suppress the generation of twisting waves on the outer surface, and to obtain sufficient breaking strength, the thickness of the insulator of the insulated wire and the thickness of the outer sheath In addition, the conductor size (cross-sectional area) has to be considerably large (0.50 mm 2 ). For this reason, in the structure of Comparative Example 6, the outer diameter of the cable is 4.3 mm, and it is difficult to reduce the diameter.

１：絶縁電線、２：内部シース、３：外部シース、６：シース、１０：ケーブル   1: insulated wire, 2: inner sheath, 3: outer sheath, 6: sheath, 10: cable

Claims (2)

互いに撚り合わされた一対の絶縁電線の周囲をシースで覆ったケーブルであって、
前記絶縁電線は、断面積が０．１８ｍｍ２以上０．３０ｍｍ２以下の錫銅合金からなる導体を架橋ポリエチレンで被覆してなり、
前記シースは、一対の前記絶縁電線の周囲に押出被覆された非架橋ポリウレタンからなる内部シースと、前記内部シースの周囲に押出被覆された非架橋ポリウレタンからなる外部シースとを有し、
前記シースの厚さが０．５ｍｍ以上であり、前記シースの外径が４．０ｍｍ以下であることを特徴とするケーブル。 A cable in which a sheath of a pair of insulated wires twisted together is covered with a sheath,
The insulated wire is made by coating a conductor cross-sectional area consist of 0.18 mm 2 or more 0.30 mm 2 or less of tin copper alloy XLPE,
The sheath has an inner sheath made of non-crosslinked polyurethane that is extrusion-coated around a pair of insulated wires, and an outer sheath made of non-crosslinked polyurethane that is extrusion-coated around the inner sheath,
A cable, wherein the sheath has a thickness of 0.5 mm or more and an outer diameter of the sheath is 4.0 mm or less. 互いに撚り合わされた一対の絶縁電線の周囲をシースで覆ったケーブルの製造方法であって、
断面積が０．１８ｍｍ２以上０．３０ｍｍ２以下の錫銅合金からなる導体を架橋ポリエチレンで被覆してなる一対の絶縁電線を互いに撚り合わせ、
撚り合わせた一対の前記絶縁電線の周囲に非架橋ポリウレタンを押出被覆して内部シースを形成し、
その後、前記内部シースの周囲に前記内部シースと同じ非架橋ポリウレタンを押出被覆して外部シースを形成することで、前記内部シースと前記外部シースとからなる厚さ０．５ｍｍ以上かつ外径４．０ｍｍ以下の前記シースを形成することを特徴とするケーブルの製造方法。 A method of manufacturing a cable in which a periphery of a pair of insulated wires twisted together is covered with a sheath,
Cross-sectional area 0.18 mm 2 or more 0.30 mm 2 or less of a conductor made of tin copper alloy twisted pair of insulated wires formed by coating with cross-linked polyethylene with each other,
A non-crosslinked polyurethane is extrusion-coated around a pair of twisted insulated wires to form an inner sheath,
Thereafter, the outer sheath is formed by extrusion coating the same non-crosslinked polyurethane as that of the inner sheath around the inner sheath, so that the thickness of the inner sheath and the outer sheath is 0.5 mm or more and the outer diameter is 4. A method for manufacturing a cable, comprising forming the sheath of 0 mm or less.
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