Composite cable

Abstract

To suppress variation in peelability of an outer sheath of a composite cable.SOLUTION: A composite cable 1 comprises at least two power lines 3 each having an insulating layer 32 on the outer periphery of a conductor 31, at least a pair of twisted signal lines, each pair comprising two signal lines 2 each having an insulating layer 22 on the outer periphery of a conductor 21, which are twisted together, and an outer sheath 4 formed on the outer periphery of the cable core in which all the power lines and all the twisted signal lines are twisted together, wherein a lubricant 5 is sealed between the cable core and the outer sheath, and the lubricant has penetrated into the gaps between the twisted power lines and signal lines.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a composite cable. [Background technology]

[0002] Conventionally, in order to improve the releasability between the linear body of an electric wire and the outer sheath, a powdery lubricant such as talc has been applied to the surface of the linear body before the wire is covered with the outer sheath (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-110260 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, composite cables in which multiple cables are bundled together with a sheath have come to be used in machines and devices. In some composite cables, a cable core is formed by twisting together a plurality of power lines or a pair of signal lines twisted together inside a sheath. When the above-mentioned conventional technology is applied to such a cable core, the power lines and signal lines in the cable core become entangled by twisting, forming complex gaps, making it difficult for a powdered lubricant such as talc to reach the gaps between the individual power lines and signal lines. This has led to a problem in that the strippability of the outer sheath of the composite cable tends to vary.

[0005] The present invention has been made in consideration of the above problems, and has an object to suppress variation in strippability of the outer sheath of a composite cable. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides: At least two power lines each having an insulating layer around the conductor; at least one pair of twisted signal wires, each of which is formed by twisting together two signal wires having an insulating layer around the outer periphery of a conductor; a composite cable including a cable core formed by twisting all of the power supply wires and all of the twisted pair signal wires together, and an outer sheath formed around the outer periphery of the cable core, A lubricant is enclosed between the cable core and the outer sheath, and the lubricant penetrates into gaps that occur around the outer periphery of the twisted power wire and signal wire. [Effects of the Invention]

[0007] According to the present invention, it is possible to suppress variations in strippability of the outer sheath of a composite cable. [Brief explanation of the drawings]

[0008] [Figure 1] This is a diagram showing the state in which the signal line of the composite cable is connected to the ABS sensor and the ABS control device, and the power line is connected to the EPB control device and the actuator. [Figure 2] 1 is a cross-sectional view showing an example of the configuration of a composite cable according to an embodiment of the present invention, showing a four-core configuration. [Figure 3] 1 is a cross-sectional view showing an example of the configuration of a composite cable according to an embodiment of the present invention, showing a case of six cores. [Figure 4] 10 is a diagram showing that the conductor of the power supply line or signal line is made up of a plurality of strands twisted together. FIG. [Figure 5] Figure 5(a) shows a state in which four signal wires and power wires are twisted together within a composite cable, and Figure 5(b) shows a state in which six signal wires and power wires are twisted together within a composite cable. [Figure 6] FIG. 1 is a configuration diagram of a system for performing an extrusion coating process for a composite cable. [Figure 7] 1 is a table showing the results of evaluation of "variation in adhesion," "talc scattering," and "processability" for Examples 1 to 4 and Comparative Examples 1 and 2. [Figure 8] FIG. 1 is an explanatory diagram showing the measurement environment for "talc scattering property." [Figure 9] FIG. 1 is an explanatory diagram showing the scattering range for evaluating "talc scattering property." DETAILED DESCRIPTION OF THE INVENTION

[0009] [Outline of composite cable] Hereinafter, a composite cable according to the present invention will be described with reference to the drawings. However, although the embodiments described below are subject to various limitations that are technically preferable for implementing the present invention, the scope of the present invention is not limited to the following embodiments or illustrated examples. In the following description, "numeric value A to numerical value B" refers to a range of "numerical value A or more and numerical value B or less."

[0010] The composite cable 1 comprises a plurality of signal wires 2 and power wires 3 each having a resin layer 22, 32 as an insulating layer around the outer periphery of a conductor 21, 31, and an outer sheath 4 covering the outer periphery of the plurality of signal wires 2 and power wires 3. A plurality of signal lines 2 and a plurality of power lines 3 form a cable core, and a lubricant 5 is enclosed between the cable core and an outer sheath 4. Furthermore, no pressure wrapping with pressure tape is formed around the outer periphery of the cable core.

[0011] The composite cable 1 can be used as a cable for electronic control of various machines or devices, such as industrial machines, industrial robots, vehicles, and the like. For example, as shown in FIG. 1, the multiple signal lines 2 of the composite cable 1 include a signal line for transmitting a signal from a sensor 11 of an antilock braking system to a control device 12, and the multiple power supply lines 3 include a power supply line for supplying power from a control device 13 of an electric parking brake to an actuator 14, but this configuration is not limited to this.

[0012] 2 and 3 are cross-sectional views showing configuration examples of the composite cable 1 according to this embodiment. Fig. 2 shows a four-core cable with two signal wires 2 and two power wires 3, where two signal wires 2 are twisted together to form one set of twisted-pair signal wires. Fig. 3 shows a six-core cable with four signal wires 2 and two power wires 3, where two sets of four signal wires 2 are twisted together in pairs to form two sets of twisted-pair signal wires. Note that the number of sets of twisted-pair signal wires in the signal wires 2 and the number of power wires 3 are merely examples and are not limited to the above examples. In this embodiment, the composite cable 1 includes multiple pairs of twisted signal wires and multiple power wires 3, and each of the signal wires 2 and power wires 3 has an insulating resin layer 22, 32 around the outer periphery of the conductor 21, 31. The multiple signal wires 2 and multiple power wires 3 are collectively covered with an outer sheath 4. The sheath layer 4 may be composed of multiple layers.

[0013] The outer diameter of the signal line 2 is not particularly limited, but is exemplified as 0.5 to 2.5 mm in terms of strength and flexibility. The outer diameter of the power line 3 is not particularly limited, but is exemplified as 1.5 to 4.0 mm in terms of strength and flexibility.

[0014] 4, the conductors 21 and 31 of the signal line 2 and the power line 3 are conductors formed by twisting together a plurality of strands 21a and 31a. The strands 21a and 31a are made of copper, a copper alloy, aluminum, or an aluminum alloy. The cross-sectional shape of each of the wires 21a, 31a of the conductors 21, 31 may be circular (round wire) or rectangular (rectangular wire).

[0015] The resin layers 22, 32 of the signal line 2 and the power line 3 cover the conductors 21, 31. The resin layers 22, 32 are preferably made of a heat-resistant resin. There are no particular restrictions on the heat-resistant resin as long as it has insulating and heat-resistant properties, and examples include thermoplastic resins and thermosetting resins. Specific examples include (crosslinked) polyethylene, polyamide, polyamideimide (PAI), polyimide (PI), polyurethane, chloroprene rubber, and rubber made of ethylene-vinyl acetate copolymer (EVA rubber). The resin layers may contain various commonly used additives.

[0016] 2 and 3, the dashed circles including pairs of signal wires 2 indicate that the signal wires 2 are twisted pair signal wires in which two signal wires 2 are twisted together. A twisted pair signal wire has higher flexibility than signal wires 2 that are not twisted together.

[0017] As shown in FIGS. 5(a) and 5(b), the composite cable 1 has the signal wires 2 and power wires 3 twisted together inside the outer sheath 4 and further twisted together overall. This allows the composite cable 1 to stretch as a whole, improving overall flexibility and repetitive bending resistance. FIG. 5(a) shows the case where the composite cable 1 has four cores (see FIG. 2), and FIG. 5(b) shows the case where the composite cable 1 has six cores (see FIG. 3).

[0018] [Outer sheath] Polyolefin resin is used for the outer sheath 4. Polyolefin resins include polyethylene (PE), polypropylene (PP), ethylene vinyl acetate copolymer (EVA), and the like, and also include those modified with unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, itaconic acid, fumaric acid, maleic anhydride, itaconic anhydride, and fumaric anhydride. The polyolefin resin may also be crosslinked. The outer sheath 4 may be a single layer or multiple layers, and the layer thickness can be determined appropriately depending on the application, etc. The layer thickness of the outer sheath 4 is set to, for example, 0.5 to 3.0 mm in terms of flexibility, bending resistance, and abrasion resistance. The outer diameter of the outer sheath 4 is equal to the outer diameter of the composite cable 1, and the size is, for example, 5.0 to 15.0 mm, more preferably 5.0 to 12.0 mm, in terms of flexibility, bending resistance, and abrasion resistance.

[0019] [Lubricant] The lubricant 5 is made of a mixture of a fatty acid or a fatty acid salt and powdered talc. The fatty acid or fatty acid salt may be, for example, stearic acid or a stearate. The fatty acid or fatty acid salt preferably has a melting point of 70° C. or less. Talc is, for example, a powder of talc, mica, kaolin, or the like.

[0020] Before being enclosed in the cable, the fatty acid or fatty acid salt is in the form of powder and is thoroughly mixed with talc, which is also powder. This powder mixture is then applied to the surface of the cable core and, together with the cable core, is covered by the extrusion material of the outer sheath 4 and enclosed inside it. At this time, since the extrusion material of the outer sheath 4 is in a heated state, the fatty acid or fatty acid salt melts and becomes liquid due to the heat, and penetrates, together with the talc powder, into the gaps between the power wires 3 and signal wires 2 twisted together to form the cable core.

[0021] [Manufacturing composite cables] FIG. 6 is a diagram showing the configuration of a system for carrying out an extrusion coating process, which is one step in the manufacture of the composite cable 1, in which the cable core is coated with the outer sheath 4 while the lubricant 5 is enclosed therein. This system has an application device 61 arranged upstream in the conveying direction of the cable core being conveyed laterally, which applies lubricant 5 to the surface of the cable core, and an extrusion coating device 62 arranged downstream in the conveying direction, which covers the cable core to which lubricant 5 has been applied with an outer sheath.

[0022] The coating device 61 has a storage section 611 filled with talc powder and fatty acid or fatty acid salt powder, and a stirring blade 612 that performs stirring operation by rotating with a motor (not shown) is provided inside the storage section 611. The talc powder and the fatty acid or fatty acid salt powder in the storage section 611 can be sufficiently mixed by the mixing blade 612, and the storage section 611 is designed so that the cable core can pass through the mixed powder. As a result, the cable core is conveyed downstream with the lubricant 5 powder coated on its surface.

[0023] A humidifying device or a spraying device for applying moisture to the surface of the cable core may be provided upstream of the applicator 61 to ensure a sufficient amount of lubricant 5 applied by the applicator 61.

[0024] The extrusion coating device 62 has a hopper 621 for the resin material of the outer sheath 4 and a cylinder 622 for heating and melting the resin material supplied from the hopper 621, and extrudes the heated and melted resin material in the cylinder 622 into the passage through which the cable core passes to coat the cable core together with the lubricant 5. At this time, the heated and melted resin material reaches a temperature of 70 degrees Celsius or higher, which is the melting point of the fatty acid or fatty acid salt powder contained in the lubricant 5, so the fatty acid or fatty acid salt powder of the coated lubricant 5 melts and becomes liquid, and together with the talc powder, it penetrates into every corner of the gaps between the twisted signal wires 2 and power wires 3.

[0025] The cable core that has passed through the extrusion coating device 62 is passed through a cooling device (not shown) while still covered with the outer sheath 4, and the outer sheath 4 is hardened. The fatty acid or fatty acid salt contained in the lubricant 5 is also cooled, and does not return to a powder state, but instead changes from a liquid state to a solid state. As a result, a composite cable 1 is formed in which a lubricant 5 is enclosed between the cable core and the outer sheath 4.

[0026] [Example] The present invention will be described in detail below based on examples, but is not limited to these. Fig. 7 is a table showing the results of three evaluations of "adhesion variation," "talc scattering," and "processability" for Examples 1 to 4 and Comparative Examples 1 and 2.

[0027] All of Examples 1 to 4 and Comparative Examples 1 and 2 are composite cables in which a cable core consisting of a twisted pair signal wire formed by twisting together the two signal wires 2 described above and two power wires 3 is covered with an outer sheath 4. All of Examples 1 to 4 and Comparative Example 1 have a cable core consisting of one twisted pair signal wire formed by twisting two signal wires 2 together and two power wires 3, while Comparative Example 2 has a cable core consisting of two twisted pair signal wires formed by twisting two signal wires 2 together and two power wires 3. It should be noted that the "number of insulated wires" in FIG. 7 indicates the total number of signal wires 2 and power wires 3 that make up the cable core.

[0028] In Examples 1 to 3 and Comparative Examples 1 and 2, the outer diameter of each signal line 2 was 1.4 mm, and the outer diameter of each power line 3 was 2.6 mm. In Example 4, the outer diameter of each signal line 2 was 1.2 mm, and the outer diameter of each power line 3 was 2.6 mm. The overall outer diameter of Examples 1 to 3 and Comparative Example 1 is 8.3 mm, the overall outer diameter of Example 4 is 8.1 mm, and the outer diameter of Comparative Example 2, which has one more twisted pair signal wire, is 9.1 mm. 7, the item "Outer diameter (WSS2 / EPB1)" indicates the ratio between the outer diameter of the twisted pair signal wire consisting of two signal wires 2 and the outer diameter of the power wire 3. For example, if the outer diameter of the signal wire 2 is 1.4 [mm] and the outer diameter of the power wire 3 is 2.6 [mm], then 1.4 × 2 / 2.6 is approximately 1.1. Similarly, in Example 4, 1.2 × 2 / 2.6 is approximately 0.9.

[0029] In Comparative Examples 1 and 2, the lubricant enclosed between the cable core and the outer sheath 4 is talc powder with a content of 100 wt %. In contrast, in Example 1, lubricant 5 is 100 wt% stearic acid, in Examples 2 and 4, lubricant 5 is a powder of 50 wt% stearic acid and 50 wt% talc, and in Example 3, lubricant 5 is a powder of 10 wt% stearic acid and 90 wt% talc.

[0030] The adhesion force in "variation in adhesion force" refers to the measured value of the force required to pull out the outer sheath 4 under the same conditions for the composite cables of each comparative example and each example. The length of the outer sheath 4 to be pulled out was set to 50 [mm], and the standard deviation σ of the measured adhesion force [N / 50 mm] when pulled out at a constant speed was determined by three measurements (n=3). A case where σ<5 was rated "A" (good: pass), a case where σ=5 to 10 was rated "B" (fair: pass), and a case where σ>10 was rated "C" (poor: fail).

[0031] "Talc scattering" is an evaluation standard that indicates the degree to which talc powder scatters when the outer sheath 4 is pulled out from the end of the cable. Conventional composite cables, which mainly use powdered talc as a lubricant, have a problem in that the talc powder scatters during terminal processing, soiling the work site. We evaluated the extent to which the examples of the present invention contribute to solving this problem.

[0032] In this test, as shown in Figure 8, a 1-m-long composite cable was placed on the top surface of table T, which was 700 mm above the floor, with one end of the cable protruding from the outer edge of the top surface of table T, and the outer sheath 4 was pulled out to a length of 100 mm at a pulling speed of 20 mm / sec. At this time, a mat M was laid on the floor where the table T was placed, and the "talc scattering" was evaluated based on the area of ​​the talc powder scattered on the mat M by pulling out. As shown in Figure 9, when the width of the scattering area along the pulling direction of the area where the talc was scattered is L and the width of the scattering area along the direction perpendicular to the pulling direction is S, the scattering area is expressed as L × S [m 2 In this case, no scattering of talc powder was evaluated as "A" (good: pass), and L × S was 0.02 [m 2 ] is "B" (pass), L × S is 0.02 [m 2 ] or above was rated as "C" (failed).

[0033] "Processability" is an evaluation standard that indicates the strippability of the outer sheath 4. In the evaluation of terminal processability, the outer sheath 4 was actually stripped from a range of 100 mm from the end of each of the composite cables of Comparative Examples 1 and 2 and Examples 1 to 4, and the strippability at that time was evaluated. Then, if there was no difference in strippability between the signal wire 2 portion and the power wire 3 portion of the outer sheath 4, if the stripped outer sheath 4 did not remain on the composite cable, if the signal wire 2 or the power wire 3 was not damaged, and if the outer sheath 4 was not attached (not clinging), the composite cable was rated as "B" (acceptable: passed), and all other cases were rated as "C" (unacceptable: failed).

[0034] [Results of each evaluation] Regarding "variation in adhesion," Comparative Example 1 was evaluated as C and was judged to be unacceptable, while Comparative Example 2 was evaluated as B and was judged to be acceptable. In Comparative Example 2, the cable core is composed of two pairs of twisted signal wires and two power wires 3, and as shown in the cross section of Figure 3, the twisted signal wires and power wires 3 are arranged alternately in the circumferential direction, so the cross-sectional shape of the cable core is point-symmetric and close to a perfect circle, which is presumably why the load during extraction is distributed and stable. Furthermore, this cross-sectional shape allows the entire cable core to be twisted in a balanced manner in the circumferential direction and makes it less likely for gaps to occur due to irregular deformation, so even if the talc is only a powder, it can be distributed relatively evenly around the outer periphery of the cable core, which is presumably why variation between samples was reduced. In contrast, in Comparative Example 1, as shown in the cross section of Figure 2, two power wires 3 and one pair of twisted signal wires are lined up in the circumferential direction, so the twist cannot be balanced in the circumferential direction and gaps are likely to occur due to uneven deformation.It is therefore difficult to distribute talc powder alone evenly around the outer periphery of the cable core, and it is presumed that this is why variations occur among the samples.

[0035] In contrast, Example 1 was evaluated as passing, with an evaluation of B, and Examples 2 to 4 were evaluated as passing, with an evaluation of A. Although Examples 1 to 4 all have cable cores that are difficult to twist in a balanced manner in the circumferential direction, with two power wires 3 and one pair of twisted signal wires lined up in the circumferential direction, it is presumed that because the lubricant 5 contains stearic acid, which is a fatty acid, the lubricant 5 can be distributed evenly in the multiple gaps that are lined up in the circumferential direction, and the variation among the samples was reduced. Furthermore, when the cable core is covered with the outer sheath material, if the cable core is transported roughly horizontally, a lubricant consisting only of talc powder may result in a reduced amount of adhesion because the lower part of the circumferential surface is less affected by gravity than the upper part. However, if the lubricant 5 contains stearic acid, which is a fatty acid, it dissolves and penetrates into the lower part of the circumferential surface of the cable core, allowing the lubricant to be distributed evenly in the circumferential direction, which is presumably why the variation between samples is reduced. In addition, in Example 1, in which the lubricant 5 was composed only of stearic acid, the lubricant 5 was more likely to migrate than in Examples 2 to 4 during the process of covering the cable core with the outer sheath material, so it is presumed that slight variations occurred among the samples, and that only Example 1 received an evaluation of B.

[0036] In the "talc scattering resistance", Comparative Examples 1 and 2 were judged as failing with a rating of C, while Examples 1 to 4 were all judged as passing with a rating of B or higher. In Comparative Examples 1 and 2, the lubricant consisted only of talc powder, so there was nothing to hold the powder in place, resulting in a large amount of scattering. In Example 1, the lubricant 5 consisted only of stearic acid, a fatty acid, and therefore did not remain in a powder state when the composite cable 1 was formed, so no powder scattering occurred when the outer sheath 4 was pulled out. In Examples 2 to 4, the lubricant 5 is composed of talc powder and stearic acid, so the stearic acid that dissolves when the composite cable 1 is formed solidifies after cooling, thereby retaining the talc powder and preventing the powder from scattering.

[0037] In terms of "processability," Comparative Examples 1 and 2 and Examples 1 to 4 were all evaluated as B, meaning they passed. In Comparative Examples 1 and 2 and Examples 1 to 4, the lubricant enclosed between the cable core and the outer sheath was able to suppress adhesion between the resin layers 22, 32 of the signal line 2 and the power line 3 and the outer sheath 4, regardless of the material composition.

[0038] [Technical Effects of the Embodiments of the Invention] In the composite cable 1, the lubricant 5 enclosed between the cable core and the outer sheath 4 penetrates into the gaps that form around the twisted power wire 3 and signal wire 2. This prevents the lubricant from reaching all areas of the cable core, resulting in locally high adhesion, and makes it possible to suppress variations in the adhesion of the outer sheath, i.e., strippability.

[0039] Furthermore, no holding winding for the cable core is provided inside the outer sheath 4 of the composite cable 1. When a cable core is configured with a pressure wrap, the releasability of the surface of the pressure tape used for the pressure wrap can suppress adhesion to the outer sheath. However, when a pressure wrap is provided, a gap is created between the pressure tape and the cable core, and if water seeps in from the cable end, the gap becomes a path for water to penetrate deep into the cable, making the cable vulnerable to water penetration. In contrast, the composite cable 1 does not have a pressure winding, and therefore it is possible to provide a cable that is resistant to water penetration and has little variation in strippability.

[0040] Furthermore, the lubricant 5 can be a mixture of 10 to 100 wt% of fatty acid or fatty acid salt and 0 to 90 wt% of talc, or a mixture of 10 to 90 wt% of fatty acid or fatty acid salt and 10 to 90 wt% of talc. If the lubricant contains at least a fatty acid or a fatty acid salt in 5, the fatty acid or fatty acid salt melts when the lubricant is applied to the cable core or when the cable core to which the lubricant has been applied is heated while being covered with the outer sheath, and can effectively penetrate into gaps that occur on the outer periphery of the power line 3 and the signal line 2, making it possible to more effectively suppress variations in strippability. Furthermore, if the lubricant contains a powder consisting of a fatty acid or a fatty acid salt and talc, the melted fatty acid or fatty acid salt can be effectively penetrated into the gaps that occur on the outer periphery of the power line 3 and the signal line 2 together with the talc powder, thereby further improving the strippability. Furthermore, the talc powder is prevented from scattering by the fatty acid or fatty acid salt, making it possible to prevent contamination caused by the powder at the site where the composite cable 1 is laid.

[0041] Stearic acid or stearates can be used as the fatty acid or fatty acid salt contained in the lubricant 5. These have a relatively low melting point and have slipperiness, making them suitable as lubricants.

[0042] Furthermore, when the fatty acid or fatty acid salt contained in the lubricant 5 has a melting point of 70 degrees Celsius or less, the fatty acid or fatty acid salt can be effectively melted by the temperature of the outer sheath material, particularly when the cable core to which the lubricant has been applied is covered with the outer sheath, and the lubricant 5 can be effectively penetrated into gaps that occur on the outer periphery of the power line 3 and the signal line 2, making it possible to more effectively suppress variations in strippability.

[0043] [others] It goes without saying that the present invention is not limited to the above-described embodiments, and can be modified as appropriate without departing from the spirit of the present invention. For example, although the outer sheath 4 is formed in only one layer in FIGS. 2 and 3, the outer sheath 4 can also be formed in multiple layers. Although the composite cable 1 is exemplified as a configuration in which no pressure wrap is provided on the cable core, pressure wrap may be provided. As mentioned above, pressure wrap may be vulnerable to water penetration, but in an environment that is less susceptible to water penetration, it is possible to provide a composite cable in which the adhesion strength of the outer sheath, i.e., the strippability, is suppressed.

[0044] Furthermore, the description of the materials of the resin layers 22, 32 and outer sheath 4 of the composite cable 1 in this embodiment is merely an example and is not limited to the above, and other materials that can ensure insulation and internal protection functions can be selected. [Explanation of symbols]

[0045] 1 composite cable 2 signal lines 21 Conductor 21a Bare wire 22 Resin layer (insulating layer) 3 Power line 31 Conductor 31a Bare wire 32 Resin layer (insulating layer) 4 outer sheath 5 Lubricants

Claims

1. At least two power lines each having an insulating layer around the conductor; at least one pair of twisted signal wires, each of which is formed by twisting together two signal wires having an insulating layer around the outer periphery of a conductor; a composite cable including a cable core formed by twisting all of the power supply wires and all of the twisted pair signal wires together, and an outer sheath formed around the outer periphery of the cable core, A composite cable characterized in that a lubricant is enclosed between the cable core and the outer sheath, and the lubricant penetrates into gaps that occur around the outer periphery of the twisted power wire and signal wire.

2. 2. The composite cable according to claim 1, wherein the cable core is not provided with a pressure winding inside the outer sheath.

3. The composite cable according to claim 1, characterized in that the lubricant is a mixture of 10 to 100 wt% of a fatty acid or a fatty acid salt and 0 to 90 wt% of talc.

4. 4. The composite cable according to claim 3, wherein the lubricant is a mixture of 10 to 90 wt% of the fatty acid or the fatty acid salt and 10 to 90 wt% of the talc.

5. 4. The composite cable according to claim 3, wherein the fatty acid or the fatty acid salt is stearic acid or a stearate.

6. 4. The composite cable according to claim 3, wherein the fatty acid or the fatty acid salt has a melting point of 70 degrees Celsius or less.

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