JP2009224043A - Communication cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication cable with superior characteristics of communication, dielectric constant, abrasion resistance, oil resistance, etc. <P>SOLUTION: A shield tape 5 is applied on an outer surface of twisted wires 4 made by twisting three signal wires 2 and a drain wire 3 to form a shield layer. On an outer surface of the shield layer with the shield tape 5 wound around, a tape-shaped press-winding material made of polyester fiber is spirally wound around, and a polyurethane sheath 7 integrally covers an outer surface of the same 6. The signal wire 2 sheathes an outer surface of a conductor 2A with an insulator made of polyolefin to form an inner insulation layer 2B, and again, sheathes an outer surface of the inner insulation layer 2B with an insulator made of polyurethane to form an outer insulation layer 2C. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a communication cable used for, for example, a signal line for transmitting an electric signal or a communication line for communication.

Conventionally, as the communication cable, for example, in a cable including a plurality of insulated wire cores and a sheath provided on the outer periphery of the insulated wire core, the sheath is made of a coating material made of a polyolefin-based elastomer. There is one solvent resistant cable for moving parts.
Japanese Patent No. 3956033

  However, the solvent-resistant cable for moving parts of Patent Document 1 has a sheath coated on the outer periphery of the insulation core with a coating material made of a polyolefin-based elastomer. However, since polyolefin has poor wear resistance, the cable When the cable is bent or bent, cracks, cracks, etc. are likely to occur at the contact portion of the sheath that contacts other cables. Further, when the sheath is formed of polyurethane, since polyurethane has poor transmission characteristics, adjacent insulation cores not only interfere with each other but are also easily affected by electromagnetic waves, noise, and the like applied from the outside.

  In view of the above problems, an object of the present invention is to provide a communication cable excellent in characteristics such as transmission characteristics, dielectric constant, wear resistance, and oil resistance without using a regulated chemical substance such as vinyl chloride.

  The present invention is a communication cable in which a shield layer for preventing electrical interference is formed on the outer surface of a stranded wire formed by twisting a plurality of signal wires, and a sheath is coated on the outer surface of the shield layer. The signal line is formed by coating the outer surface of the conductive conductor with an insulator made of polyolefin to form an inner insulating layer, and the outer surface of the inner insulating layer with an insulator made of polyurethane. It is a communication cable in which an insulating layer is formed.

  As an aspect of the present invention, by adding an adhesive additive for closely adhering the inner insulating layer and the outer insulating layer to one of the inner insulating layer and the outer insulating layer, the inner insulating layer and the outer insulating layer The adhesion of is improved. When the cable is bent or bent, the contact surface between the inner insulating layer and the outer insulating layer is not peeled off, or a gap is not formed on the contact surface, and durability can be improved.

  As an aspect of the present invention, the conductor can be formed by twisting together a plurality of tin-plated annealed copper wires having conductivity.

  As an aspect of the present invention, the inner insulating layer can be formed to have a thickness included in the range of 0.20 mm to 0.24 mm.

  As an aspect of the present invention, the outer insulating layer can be formed to have a thickness included in the range of 0.10 mm to 0.15 mm.

  The conductor can be composed of a conductive metal wire such as a tinned annealed copper wire, for example, but if the material has substantially the same characteristics as the tinned annealed copper wire, a material other than the tinned annealed copper wire is used. Also good.

  The insulator of the inner insulating layer can be made of a material having good transmission characteristics and dielectric constant, such as polyolefin, but any material other than polyolefin may be used as long as it has substantially the same characteristics as polyolefin. .

  The insulator of the outer insulating layer can be composed of a material having high wear resistance and oil resistance, such as polyurethane, for example. However, a material other than polyurethane may be used as long as it has substantially the same characteristics as polyurethane. Good.

  According to the present invention, the inner insulating layer covered with the conductor of the signal line is made of polyolefin excellent in characteristics such as transmission characteristics and dielectric constant, so that a plurality of signal lines are twisted and wired, etc. Even so, adjacent signal lines do not interfere with each other, and the influence of externally applied electromagnetic waves, noise, or the like is reduced, so that transmission characteristics can be improved. In addition, the outer insulating layer covered with the inner insulating layer is made of polyurethane with excellent properties such as wear resistance and oil resistance, so the signal line may be bent or bent during cable wiring. However, since the outer insulating layer is not easily cracked or cracked and is not easily worn, durability can be improved. Thereby, the characteristic of the whole cable improves.

  An object of the present invention is to provide a communication cable having improved characteristics such as transmission characteristics, dielectric constant, wear resistance, and oil resistance, and a signal line wired inside the communication cable is provided on the outer surface of a conductive conductor. This was achieved by coating an insulator made of polyolefin to form an inner insulating layer, and coating the outer surface of the inner insulating layer with an insulator made of polyurethane to form an outer insulating layer.

  An embodiment of the present invention will be described in detail with reference to the drawings.

  The drawing shows a communication cable used as a signal line for transmitting an electrical signal. 1 and 2, this communication cable 1 includes a tinned annealed copper wire for suppressing the generation of noise when three signal wires 2 formed in the same wire diameter are spirally twisted together. Are arranged in the length direction along the valleys of the two signal lines 2 and 2. On the outer surface of the stranded wire 4 formed by twisting the signal wires 2 and the drain wire 3 together, a shield tape 5 laminated with aluminum for preventing electrical interference is spirally wound to form a shield layer. Forming. On the outer surface of the shield layer formed by wrapping the shield tape 5, a tape-shaped wound body 6 made of polyester fiber is spirally wound. The outer surface of the wound body 6 is integrally covered with a sheath 7 made of polyurethane.

  The three signal lines 2 are made up of a signal line 2 colored in red, a signal line 2 colored in yellow, and a signal line 2 colored in black. As shown in FIG. The signal line 2 is disposed in the upper center, the yellow signal line 2 is disposed on the lower left side, and the black signal line 2 is disposed on the lower right side. Note that the identification color of the signal lines 2 may be changed to a desired identification color other than red, yellow, and black. Further, the number of signal lines 2 may be changed to two or more than three.

  Since the cross-sectional structures of the signal lines 2 are the same, the cross-sectional structure of one conductor will be described in detail with reference to FIG. The signal line 2 is formed by coating an insulator made of polyolefin in the outer peripheral surface length direction of a conductor 2A formed by twisting 12 tin-plated annealed copper wires having conductivity, and forming an inner insulating layer 2B. An outer insulating layer 2C is formed by covering an insulator made of polyurethane in the length direction of the outer peripheral surface of the insulating layer 2B.

  The inner insulating layer 2B is made of a material mainly composed of polyolefin having good transmission characteristics and dielectric constant obtained by adding a colorant and an adhesive additive. The standard thickness of the inner insulating layer 2B is formed to a thickness included in the range of about 0.20 mm to about 0.24 mm. In the embodiment, the inner insulating layer 2B is formed to have a thickness of about 0.20 mm. The insulator of the inner insulating layer 2B is made of polyolefin.

  In the embodiment, since it is necessary to identify the three signal lines 2..., Red, yellow, and black color chips are used as an example of the colorant constituting the inner insulating layer 2B. A color chip having a desired color may be used in accordance with the number and application.

  The outer insulating layer 2C is made of a material mainly composed of polyurethane having excellent wear resistance and oil resistance obtained by adding a release additive. The standard thickness of the outer insulating layer 2C is formed to a thickness included in the range of about 0.10 mm to about 0.15 mm. In the embodiment, the outer insulating layer 2C has a thickness of about 0.10 mm.

  In the embodiment, ET358-10 (trade name) is used as an example of the polyurethane constituting the outer insulating layer 2C, but polyurethanes having other trade names may be used.

  That is, the outer peripheral surface of the conductor 2A is covered with the inner insulating layer 2B, the outer peripheral surface of the inner covering layer is covered with the outer insulating layer 2C, and the outer diameter of the entire signal line 2 is about 1.38 mm to about 1.39 mm. It is formed to become. Note that the thickness of the inner insulating layer 2B is changed to about 0.20 mm or less or about 0.24 mm or more, or the thickness of the outer insulating layer 2C is changed to about 0.10 mm or less or about 0.15 mm or more. May be.

  Since a predetermined amount of an adhesive additive is added to the insulator of the inner insulating layer 2B, the adhesion surface between the inner insulating layer 2B and the outer insulating layer 2C is firmly bonded without any gap due to the characteristics of the adhesive additive. . Thereby, the adhesiveness of the inner side insulating layer 2B and the outer side insulating layer 2C becomes better than the signal line 2 to which no adhesive additive is added. When the communication cable 1 is bent or bent, the contact surface between the inner insulating layer 2B and the outer insulating layer 2C is not peeled or a gap is not formed on the contact surface, thereby improving durability.

  The conductor 2A is composed of twelve tin-plated annealed copper wires having a wire diameter of about 0.18 mm, twisted in a spiral at a predetermined pitch, and bundled into one conductor 2A. The outer diameter is formed to be about 0.70 mm.

  Change the wire diameter of the tin-plated annealed copper wire to a desired dimension of about 0.18 mm or less or about 0.18 mm or more, or change the number of tin-plated annealed copper wires to a desired number of 12 or less or more. Also good. Further, the outer diameter of the conductor 2A may be changed to a desired dimension of about 0.70 mm or less or about 0.70 mm or more.

  The drain wire 3 is a twelve tin-plated annealed copper wire formed to a wire diameter of about 0.18 mm, spirally twisted and bundled into one, and a yellow signal arranged at the lower left side shown in FIG. It arrange | positions in the length direction along the trough of the line 2 and the black signal line 2 arrange | positioned at the lower right side. The drain wire 3 may be disposed between the red signal line 2 and the yellow signal line 2 and between the red signal line 2 and the black signal line 2.

  In the embodiment, the outer diameter of the stranded wire 4 is formed so that the outer diameter of the stranded wire 4 formed by twisting the signal wires 2 and the drain wire 3 into one is about 2.95 mm. May be changed to a desired dimension of about 2.95 mm or less, or about 2.95 mm or more.

  The shield tape 5 is obtained by uniformly laminating aluminum over the entire length of one side of a tape made of polyethylene terephthalate (PET resin) formed to have a width of about 15 mm. 2 and the drain wire 3 are wound in a spiral direction along the outer peripheral surface of a stranded wire 4 formed by spirally twisting the drain wire 3 at a predetermined pitch to prevent electrical interference such as electromagnetic waves on the outer peripheral surface of the stranded wire 4. The shield layer is formed. Thus, the outer diameter of the shield layer formed by winding the shield tape 5 is formed to be about 3.05 mm to about 3.15 mm.

  It should be noted that the outer diameter of the shield tape 5 may be changed to a desired dimension of about 3.05 mm or less or about 3.15 mm or more. Further, instead of the PET resin shield tape 5, for example, an aluminum tape, a steel tape, a copper tape, or the like obtained by bonding an aluminum foil to the entire length of one side of a polyester tape may be used.

  The wound body 6 is made of a polyester fiber having a width of about 15 mm, and is wound around the outer periphery of the light-shielding tape wound around the stranded wire 4 in a spiral direction to wind the wound body 6. The outer diameter is formed to be about 3.15 mm to about 3.25 mm. In addition, you may change the winding outer diameter dimension of the winding body 6 to the desired dimension of about 3.15 mm or less or about 3.25 mm or more.

  The sheath 7 is made of polyurethane to which a black colorant is added, and covers the entire outer peripheral surface of the wound body 6 wound around the outer surface of the light shielding tape, and the communication cable 1 in which the shield tape 5 is wound. Is forming. Thus, the outer diameter of the communication cable 1 covering the sheath 7 is formed to be about 4.35 mm.

  In the embodiment, the standard thickness of the sheath 7 is formed to be about 0.55 mm. However, even if the thickness of the sheath 7 is changed to a desired thickness of about 0.55 mm or less or about 0.55 mm or more. Good. Further, ET358-10 (trade name) that is the same as the outer insulating layer 2C is used as an example of the polyurethane constituting the sheath 7, and master color = 880 MB50 black (trade name) is used as an example of the colorant. However, polyurethanes and adhesives made of other trade names may be used.

  In the communication cable 1 of the present invention, the inner insulating layer 2B covered with the conductor 2A of the signal line 2 is made of polyolefin excellent in characteristics such as transmission characteristics and dielectric constant. Even if the wires are twisted together, the adjacent signal lines 2 do not interfere with each other, and the influence of electromagnetic waves, noise, etc. given from the outside is reduced, so that transmission characteristics can be improved. it can. In addition, since the outer insulating layer 2C covered with the inner insulating layer 2B is made of polyurethane having excellent characteristics such as wear resistance and oil resistance, the signal line 2 is bent when the communication cable 1 is wired. Even if it is bent or the like, the outer insulating layer 2C is not easily cracked or cracked, and is not easily worn, so that durability can be improved. Thereby, the characteristic of the communication cable 1 whole improves.

  The communication cable 1 of the present invention does not use a regulated chemical substance such as vinyl chloride. In other words, it is a cable that does not contain regulated chemical substances that are restricted in use to generate halogen gas during incineration, and that is generally non-halogen and halogen-free and has little influence on the natural environment.

  The regulated chemical substances are, for example, lead (Pb), cadmium (Cd), mercury (Hg), hexavalent chromium (Cr6 +), polybrominated biphenyl (PBB), polybrominated diphenyl ether (RoHS regulated chemical substances) PBDE).

  The present invention is not limited only to the configuration of the above-described embodiment, but can be applied based on the technical idea shown in the claims, and many embodiments can be obtained.

  For example, polytetrafluoroethylene (PTFE) manufactured by DuPont, USA may be used as another example of the adhesive additive in place of the polyolefin in the examples. Polytetrafluoroethylene is slightly better in oil resistance and dielectric constant than polyolefin, but has substantially the same functions and effects as the examples.

The edge part perspective view which shows the internal structure of a communication cable. FIG. 2 is a longitudinal end view showing an internal structure of the communication cable of FIG. 1. The longitudinal section which shows the insulator coating | cover structure of a signal wire | line.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Communication cable 2 ... Signal wire 2A ... Conductor 2B ... Inner insulating layer 2C ... Outer insulating layer 3 ... Drain wire 4 ... Stranded wire 5 ... Shield tape 6 ... Coiled body 7 ... Sheath

Claims (5)

A communication cable in which a shield layer for preventing electrical interference is formed on the outer surface of a stranded wire formed by twisting a plurality of signal wires, and a sheath is coated on the outer surface of the shield layer,
The signal line is
The outer surface of the conductive conductor is coated with an insulator made of polyolefin to form an inner insulating layer,
An outer insulating layer is formed by coating an outer surface of the inner insulating layer with an insulator made of polyurethane. The communication cable according to claim 1, wherein an adhesive additive for adhering the inner insulating layer and the outer insulating layer to each other is added to one of the inner insulating layer and the outer insulating layer. The communication cable according to claim 1, wherein the conductor is formed by twisting a plurality of tin-plated annealed copper wires having conductivity. The communication cable according to any one of claims 1 to 3, wherein the inner insulating layer has a thickness included in a range of 0.20 mm to 0.24 mm. The communication cable according to any one of claims 1 to 4, wherein the outer insulating layer has a thickness included in a range of 0.10 mm to 0.15 mm.

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