JP5438491B2 - Composite flat cable - Google Patents

Description

  The present invention relates to a composite flat cable useful for construction of an FA (Factory Automation) system.

  Conventionally, a composite flat cable in which a plurality of power supply lines and a plurality of signal lines are aligned in an arbitrary order and fused or bonded together is known (for example, see Patent Document 1). In addition, the power supply line and the signal line need only be wired once, and high density mounting and wiring in a narrow space are easy.

  By the way, in recent years, this type of composite flat cable has been used for FA (Factory Automation) systems that manage and automate various devices in a factory in an integrated manner. The typical composite flat cable has a structure in which two power supply lines and two signal lines are arranged in parallel and bonded or fused together, and a collective coating is provided on the outer periphery thereof. Polyvinyl chloride resin (PVC), which can be easily bonded or fused, is used as the insulating coating material for the power supply line and the signal line. Since each of the two power supply lines and the two signal lines is bonded or fused, variation in the pitch between the lines is small, and a highly reliable connection with the pressure contact connector is possible.

  However, polyvinyl chloride resin, which is used as an insulation coating material for power lines and signal lines, has a high dielectric constant, and its dielectric characteristics change depending on the frequency. Is appropriate.

  Therefore, a cable has been developed in which polyethylene having excellent dielectric properties is used as an insulation coating material for signal lines, and a coating is provided as it is without bonding or fusing the two power lines and the two signal lines. Yes.

  However, in the cable having such a structure, the positions of the power supply line and the signal line are not stable, and there is a possibility that poor connection occurs when connected to the pressure contact connector. For this reason, there is a demand for a composite flat cable that is useful for FA system applications, suitable for high-speed signal transmission, and excellent in connection reliability with a pressure contact connector.

Japanese Patent Laid-Open No. 11-53959

  The present invention has been made to meet the above-mentioned demands, and an object thereof is to provide a composite flat cable useful for FA system applications, suitable for high-speed signal transmission, and excellent in connection reliability with a pressure contact connector. .

In order to achieve the above object, according to the first aspect of the present invention, two signal lines and two power supply lines having a conductor outer diameter larger than the signal lines are arranged in parallel, and a collective coating is provided on the outer periphery thereof. A composite flat cable comprising: one power supply line on each side of the two signal lines, the signal line having a coating made of cross-linked polyethylene, and the power line being a coating made of vinyl chloride resin The bulk coating has a tensile strength measured in accordance with UL 1581 of 10 MPa or more and 15 MPa or less, an elongation of 100% or more and 500% or less, and a residual tensile strength after thermal aging at 113 ° C. × 168 hours. an inner coating rate and elongation retention is made of polyvinyl chloride resin is 70% or more and 45% or more, respectively, provided thereon, a tensile strength which is measured in accordance with UL 1581 or more 10MPa 5MPa or less, 500% 100% or more same elongation less, the tensile strength retention and elongation retention after 100 ° C. × 96 hours Hitaabura is an outer coating comprising a polyvinyl chloride resin is either 50 percent or more Is a composite flat cable characterized by

  The invention described in claim 2 is the composite flat cable according to claim 1, wherein the inner covering has a thickness of 0.05 mm or more and 0.30 mm or less.

  According to a third aspect of the present invention, in the composite flat cable according to the first or second aspect of the invention, the signal line coating has a capacitance (100 kHz, 20 ° C.) of 89 pF / m or less and conforms to UL 1581. The measured tensile strength is 10 MPa or more and 15 MPa or less, and the elongation is 100% or more and 500% or less.

The invention described in claim 4 is the composite flat cable according to any one of claims 1 to 3, wherein the composite flat cable is a flat cable for FA.

  According to the present invention, it is possible to provide a composite flat cable that is useful for FA system use, suitable for high-speed signal transmission, and excellent in connection reliability with a pressure contact connector.

It is sectional drawing which shows the composite flat cable which concerns on one Embodiment of this invention. It is a schematic sectional drawing which shows the state which connected the conventional composite flat cable with the press-contact connector.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a sectional view showing an embodiment of a composite flat cable of the present invention.

  As shown in FIG. 1, the composite flat cable 10 according to the present embodiment has two signal lines 12 and two power lines 14 arranged on substantially the same plane and on both sides of the two signal lines 12. Are arranged in parallel so that adjacent lines are in close contact with each other, and a collective coating 16 is provided on the outer periphery thereof. The collective coating 16 has an inner coating 17 provided on the outer periphery of the two signal lines 12 and the two power supply lines 14 with a substantially uniform thickness, and a tape-like shape on the inner coating 17, that is, in the width direction. It is comprised from the outer coating | cover 18 provided so that thickness might become substantially uniform. Note that a flat surface portion 19 perpendicular to the upper surface (or lower surface) of the outer coating 18 is formed on one side surface of the outer coating 18. Thus, by changing the shape of both side surfaces, the signal lines 12 and the power supply lines 14 arranged inside can be identified, and erroneous connection at the time of wiring can be prevented. In FIG. 1, reference numeral 21 indicates a mark provided on the surface of the collective covering 16 on each signal line 12 in order to indicate the position of the signal line 12.

As the signal line 12, a conductor 12A made of one or a plurality of annealed copper wires, tin-plated annealed copper wires, or the like is provided with an insulating coating 12B made of polyethylene crosslinked by electron beam irradiation. The outer diameter of the signal line 12 is usually 1.0 mm or greater and 3.0 mm or less. A colorant may be blended in the insulating coating 12B. In this embodiment, 21 AWG (cross-sectional area: about 0.5 mm ² , outer diameter: about 0.9 mm) twisted conductor (20 / 0.18 mmφ) made of tinned annealed copper wire was cross-linked by electron beam irradiation. An outer diameter of about 2.2 mm coated with an insulating coating made of polyethylene is used.

As the power supply line 14, a conductor provided with an insulating coating 14B made of a heat-resistant polyvinyl chloride resin on a conductor 14A made of one or a plurality of annealed copper wires or tin-plated annealed copper wires is used. The outer diameter of the conductor 14A of the power supply line 14 is larger in diameter than the outer diameter of the conductor 12A of the signal line 12. A coloring agent may be blended in the insulating coating 14B. In this embodiment, a 19AWG (cross-sectional area of about 0.75 mm ² , outer diameter of about 1.1 mm) twisted wire conductor (30 / 0.18 mmφ ) made of tinned annealed copper wire is used.

  In the present embodiment, these signal lines 12 and power supply lines 14 are arranged at a pitch P of approximately 2.54 mm. The insulating coatings 12B and 14B of the signal line 12 and the power supply line 14 are colored in the order of red, white, blue and black from the left side of the drawing.

  The inner coating 17 of the batch coating 16 is formed by extrusion-coating a transparent heat-resistant polyvinyl chloride resin on the two signal lines 12 and the two power lines 14 arranged in parallel as described above. The thickness of the inner coating 17 is usually 0.05 mm or more and 0.30 mm or less.

  The outer coating 18 of the batch coating 16 is formed by extrusion coating a heat and oil resistant polyvinyl chloride resin on the inner coating 17. The outer coating 18 is usually coated so that the cable width W is about 12 mm and the cable thickness T is about 4.5 mm. Inner coating 17 and outer coating 18 may be coated by two-layer coextrusion.

  In this embodiment, the inner coating 17 is coated to a thickness of 0.22 mm, and the outer coating 18 is coated so that the cable width W is 12.15 mm and the cable thickness T is 4.56 mm.

  In the present invention, the insulating coating 12B of the signal line 12, the inner coating 17 and the outer coating 18 of the collective coating 16 are preferably configured to satisfy the following requirements.

  (1) The electrostatic capacity (100 kHz, 20 ° C.) of the insulating coating 12B of the signal line 12 is 89 pF / m or less, the tensile strength measured according to UL 1581 is 10 MPa or more and 15 MPa or less, and the elongation is 100% or more. 500% or less.

  If the capacitance is out of the above range, the characteristic impedance deviates from a predetermined value (124 ± 24Ω), so that the transmission characteristics deteriorate due to the irregular reflection of the signal. On the other hand, if the tensile strength and elongation are out of the above ranges, the balance between mechanical properties and workability is deteriorated.

  (2) Tensile strength of inner coating 17 of batch coating 16 is 10 MPa or more and 15 MPa or less, the elongation is 100% or more and 500% or less, 113 ° C. × 96 hours after heat aging, measured according to UL 1581 The residual strength rate and the residual elongation rate are 70% or more and 45% or more, respectively.

  If the tensile strength and elongation are out of the above ranges, the balance between mechanical properties and workability will be deteriorated. Further, if either one of the tensile strength residual rate and the elongation residual rate after heat aging is out of the above range, the heat resistance necessary for the cable cannot be sufficiently satisfied.

  (3) Tensile strength of outer coating 18 of batch coating 16 is 10 MPa or more and 15 MPa or less, elongation is 100% or more and 500% or less, 100 ° C. × 96 hours after oil immersion, measured in accordance with UL 1581 Both the residual strength rate and the residual elongation rate are 50% or more.

  If the tensile strength and elongation are out of the above ranges, the balance between mechanical properties and workability will be deteriorated. If either one of the residual tensile strength and the residual elongation after oil immersion is less than 50%, the oil resistance and heat resistance required for the cable cannot be sufficiently satisfied.

  (4) The cable as a whole has flame retardancy that passes the UL standard vertical combustion test (UL 1581 · VW-1).

  (5) Conductor 12A and 14A are disconnected in a bending test (speed: 50 cycles / min, mandrel diameter: 100 mm, load: 1000 gf, cable long diameter surface abuts on mandrel) using ± 90 ° bend tester for cable The number of bends until it is 200,000 times or more.

  In the composite flat cable 10 of the present embodiment, a material having a low dielectric constant is used for the insulation coating 12B of the signal line 12, and a transparent heat-resistant polyvinyl chloride resin and oil-resistant heat-resistant polyvinyl chloride are formed on the signal line 12 and the power line 14. A two-layer package 16 made of vinyl resin is provided. Therefore, the transmission characteristics required for the FA cable can be provided, and the signal line 12 and the power line 14 are not displaced as shown in FIG. It can be performed.

  That is, FIG. 2 is a cross-sectional view schematically showing a state in which a conventional composite flat cable is connected to the pressure contact connector 25. As shown in FIG. 2, in this example, since the signal line 22 and the power supply line 24 are misaligned, there are the signal line 22 and the power supply line 24 in which sufficient electrical contact with the pressure contact connector 25 cannot be obtained. . On the other hand, in the composite flat cable 10 of this embodiment, since the signal line 12 and the power supply line 14 can be positioned on substantially the same plane, the conductor of each line and the pressure contact connector can be brought into contact with each other almost reliably. Highly reliable connection is possible.

  EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited to these Examples at all. In addition, the physical property of each coating | cover in an Example was measured by the method shown below.

[Insulation resistance]
In accordance with JIS C 3005, a DC voltage of 500 V was applied between the wire cores, and an insulation resistance meter was measured after 1 minute for calculation.
[Capacitance]
Based on JIS C 3005, it measured at 20 degreeC at 100 kHz.
[Tensile strength, elongation]
Based on UL 1581, measurement was performed under the conditions of a tensile speed of 500 mm / min, a distance between marked lines of 25.4 mm, and a temperature of 20 ° C.
[Tensile strength and elongation after heat aging]
After heat aging at 113 ° C. for 168 hours, the measurement was performed in accordance with UL 1581 under conditions of a tensile speed of 500 mm / min, a distance between marked lines of 25.4 mm, and a temperature of 20 ° C.
[Tensile strength and elongation after oil immersion]
After soaking at 100 ° C. for 96 hours, the measurement was performed in accordance with UL 1581 under the conditions of a tensile speed of 500 mm / min, a distance between marked lines of 25.4 mm, and a temperature of 20 ° C.

Examples 1-15
A 19 AWG tin-plated annealed copper stranded conductor (20 / 0.18 mm) is extrusion-coated with a polyethylene resin blended with a colorant and crosslinked by electron beam irradiation to form an insulating coating. The outer diameter is about 2.1 mm. A signal line was obtained.

  Also, a heat-resistant polyvinyl chloride resin blended with a colorant is extruded onto a 21 AWG tin-plated annealed copper stranded conductor (30 wires / 0.18 mm) to form an insulation coating, and a power line having an outer diameter of about 2.1 mm Got.

  Next, the two signal lines and the two power lines are introduced into the extruder in parallel on substantially the same plane so that one power line is arranged on each side of the signal line, and transparent heat resistant vinyl chloride is introduced. The resin is extrusion coated to a thickness of 0.22 mm, and further heat and oil resistant polyvinyl chloride resin is extrusion coated thereon, as shown in FIG. 1, width W 12.15 mm, thickness T 4.56 mm, conductor pitch about 2 A .54 mm composite flat cable was produced.

  After that, each composite flat cable obtained was connected to a commercially available 4-core pressure connector (made by OMRON Corporation), and a thermal shock test (-55 ° C. × 15 minutes and + 85 ° C. × 15 minutes as one cycle, 5 cycles) Repeatedly, the atmosphere movement at high and low temperatures should be within 15 seconds in the air), and the contact resistance before and after thermal shock and its change were investigated. The contact resistance was measured for all signal lines and power lines in each composite flat cable using a contact resistance meter HIOKI 3225 manufactured by Hioki Electric Co., Ltd., and the average value was calculated. In addition, a vertical combustion test of UL standard (UL1581) was performed, and pass / fail was determined. These results are shown in Table 1 and Table 2 together with the physical property values of each coating.

  As is apparent from the above results, both are composite flat cables useful for FA system applications, suitable for high-speed signal transmission, and excellent in connection reliability with a pressure contact connector.

  DESCRIPTION OF SYMBOLS 10 ... Composite flat cable, 12 ... Signal wire, 14 ... Power supply line, 16 ... Collective coating, 17 ... Inner coating, 18 ... Outer coating

Claims (4)

A composite flat cable in which two signal lines and two power lines having a conductor outer diameter larger than that of the signal lines are arranged in parallel, and a collective coating is provided on the outer periphery thereof,
One power line is disposed on each side of the two signal lines, the signal line has a coating made of crosslinked polyethylene, the power line has a coating made of vinyl chloride resin , and the collective coating is The tensile strength measured in accordance with UL 1581 is 10 MPa or more and 15 MPa or less, the elongation is 100% or more and 500% or less, and the tensile strength residual rate and elongation residual rate after heat aging at 113 ° C. × 168 hours are 70 respectively. % And 45% or more of the inner coating, and the tensile strength measured in accordance with UL 1581 provided thereon is 10 MPa or more and 15 MPa or less, and the elongation is 100% or more and 500 %, 100 ° C. × 96 hours after oil immersion, the tensile strength residual ratio and the elongation residual ratio are both 50% or more of the outer coating made of a polyvinyl chloride resin. Composite flat cable.   The composite flat cable according to claim 1, wherein the inner covering has a thickness of 0.05 mm or more and 0.30 mm or less.   The signal line coating has an electrostatic capacity (100 kHz, 20 ° C.) of 89 pF / m or less, a tensile strength measured in accordance with UL 1581 of 10 MPa to 15 MPa, and an elongation of 100% to 500%. The composite flat cable according to claim 1, wherein the composite flat cable is provided. The composite flat cable according to any one of claims 1 to 3, wherein the composite flat cable is a flat cable for FA.

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