JP2018190516A - Wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire that includes a thin insulator and achieves space saving and high flexibility.SOLUTION: A wire has a conductor, and an insulator that covers the conductor and includes a polyvinyl chloride resin. The conductor has a twisted wire in which a plurality of conductor elemental wires with an elemental wire diameter of 0.10 mm or more and 0.260 mm or less are twisted together in two or more stages. The conductor has a cross-sectional area of 5 mmor more and 50 mmor less, and the insulator has a thickness of 0.8 mm or more and 1.4 mm or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electric wire.

  Patent Document 1 has a conductor and an insulator covering the outer periphery of the conductor, and the insulator contains a chlorinated vinyl chloride resin and a vinyl chloride thermoplastic elastomer. An insulated wire is disclosed.

Japanese Patent Laying-Open No. 2015-225837

  Since the electric wire wound around the ferrite core is wound around the ferrite core a plurality of times so as not to generate noise, it is required to be flexible and have a small diameter.

  An object of the present invention is to provide an electric wire having a thin insulator, space saving, and high flexibility.

The electric wire of the present invention is
A conductor, and an insulator containing a polyvinyl chloride resin covering the conductor,
The conductor is composed of a stranded wire in which a plurality of conductor wire diameters of 0.10 mm to 0.260 mm are twisted in two or more stages,
The cross-sectional area of the conductor is 5 mm ² or more and 50 mm ² or less,
The insulator has a thickness of 0.8 mm to 1.4 mm.

  According to the present invention, it is possible to provide an electric wire having a thin insulator, space-saving and high flexibility. Therefore, the same ferrite core can be wound more times than the conventional electric wire, and the noise removal effect is increased. When the noise removal effect is sufficient for the same number of windings as in the prior art, the ferrite core can be reduced in size by reducing the wire diameter.

It is sectional drawing which shows an example of the electric wire which concerns on embodiment of this invention.

[Description of Embodiment of the Present Invention]
First, the contents of the embodiments of the present invention will be listed and described.
The electric wire according to the embodiment of the present invention is
(1) comprising a conductor and an insulator containing a polyvinyl chloride resin covering the conductor;
The conductor is composed of a stranded wire in which a plurality of conductor wire diameters of 0.10 mm to 0.260 mm are twisted in two or more stages,
The cross-sectional area of the conductor is 5 mm ² or more and 50 mm ² or less,
It is an electric wire whose thickness of the insulator is 0.8 mm or more and 1.4 mm or less.
According to this configuration, it is possible to provide an electric wire having a thin insulator, space saving, and high flexibility.

(2) Also, the wire in (1)
The insulator contains a plasticizer in an amount of 60 parts by mass to 120 parts by mass with respect to 100 parts by mass of the polyvinyl chloride resin.
According to this configuration, a more flexible electric wire can be provided.

(3) In addition, the wire of (1) or (2)
The thickness ratio of the insulator is 75% or more.
According to this configuration, an electric wire that is flexible and excellent in mechanical strength can be provided.

[Details of the embodiment of the present invention]
Next, embodiments of the electric wire according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view showing an example of an electric wire according to an embodiment of the present invention. In the figure, 1 is an electric wire, 2 is a conductor, 21 is a first stranded wire, 22 is a second stranded wire, 23 is a third stranded wire, and 3 is an insulator. The electric wire 1 of this embodiment includes a conductor 2 and an insulator 3 that covers the conductor 2.

The conductor 2 has a cross-sectional area of 5 to 50 mm ² . The first stranded wire 21 is formed by twisting together a plurality of conductor strands made of metal. The second stranded wire 22 is configured by twisting a plurality of first stranded wires 21. The third stranded wire 23 is configured by twisting a plurality of second stranded wires 22 together. For example, the first stranded wire 21 has 34 conductor strands twisted together, the second stranded wire 22 has seven first stranded wires 2 twisted, and the third stranded wire 23 has seven second stranded wires. Constructed by twisting together. By setting it as the structure twisted in such 3 steps, since a clearance gap is formed between conductors, a softness | flexibility can be ensured. In addition, when the cross-sectional area of the conductor 2 is 8 to 25 mm ² , the electric wire is more space-saving, which is preferable. The conductor 2 may be composed of only the first stranded wire and the second stranded wire (or so-called stranded wire).

  Although a conductor strand is not specifically limited, For example, it is comprised from copper, copper alloy, tin plating copper, aluminum, aluminum alloy etc. Moreover, the diameter of a conductor strand is 0.10 mm or more and 0.260 mm or less. When a thin conductor wire is used, a more flexible electric wire can be obtained because the wire itself is flexible.

  The number of conductor strands constituting the first stranded wire 21, the twist direction and twist pitch of the first stage twist, the number of the first twist wires 21 constituting the second twisted wire 22, the twist direction and twist of the second stage twist The pitch, the number of the second stranded wires 22 constituting the third stranded wire 23, the twist direction of the third stage twist, and the twist pitch are not particularly limited as long as the effects of the present application are not impaired.

The insulator 3 has a thickness of 0.8 mm to 1.4 mm and contains a polyvinyl chloride resin. When the thickness of the insulator 3 is in the above range, the electric wire of the present embodiment has high flexibility. Although it does not specifically limit as a ratio of the polyvinyl chloride resin contained in the insulator 3, For example, it is 30-70 mass%, Preferably it is good in it being 40-60 mass%. Moreover, the insulator 3 may contain a plasticizer in 60 to 120 mass parts with respect to 100 mass parts of polyvinyl chloride resin. Thereby, the further flexibility of the insulator 3 can be ensured. Although it will not specifically limit if it is generally used for the insulator of an electric wire as a plasticizer, For example, carboxylic acids, such as trimellitic acid, and a polyester plasticizer are mentioned.
In addition to the above, the insulator 3 may be added with one or more of various additives such as a filler, a flame retardant, an antioxidant, a stabilizer, and a pigment.

  The electric wire 1 can be manufactured by covering a conductor 2 made of a stranded wire twisted in three stages with an insulator 3 by pulling molding. Manufactured by pull-down molding is preferable because a gap is formed between the conductor 2 and the insulator 3 and excellent flexibility of the electric wire 1 can be obtained.

  The electric wire 1 has a “thickness ratio” that is a value obtained by dividing the minimum value of the insulator thickness by the maximum value of the thickness of the insulator and multiplying by 100 in the cross section orthogonal to the longitudinal direction of the electric wire, It is preferable that it is 75% or more. The thickness of the insulator is not always uniform, and the thickness may be non-uniform depending on the molding method and the configuration of the conductor. It is preferable that the uneven thickness ratio is 75% or more because the possibility that the insulator is thinned and broken in a part of the electric wire is reduced.

  Although the embodiment of the present invention has been described with reference to FIG. 1, as another embodiment of the present invention, there is no third stranded wire 23, and the conductor 2 is configured by the first stranded wire 21 and the second stranded wire 22. Also included are electric wires.

  Next, modes for carrying out the invention will be described by way of examples. The examples are not intended to limit the scope of the invention.

  The electric wires having the configurations of Examples 1 to 14 shown in Table 1 were created by drawing and the flexibility of the electric wires of Examples 1 to 14 was evaluated. The insulator of all the electric wires used what contained 100 mass parts of polyvinyl chloride resin, 90 mass parts of trimellitic acid, 10 mass parts of stabilizers, 10 mass parts of fillers, and 5 mass parts of flame retardants.

Flexibility Bending a wire of a predetermined length into a U shape so that the radius of curvature is 100 mm, sandwiching it between a pair of plates, bringing one plate toward the other plate, and further making the radius of curvature The electric wire was bent until the thickness became 50 mm, and the repulsive force at that time was used as an index of flexibility. The approach speed of the plate was 100 mm / min, and the total contact length between the electric wire and the plate material at the start of evaluation was 300 mm.

From the results of Example 1 to Example 5 (two-stage twisted wires) in Table 1, the repulsive force increases and the flexibility decreases as the insulator thickness increases in the wires having a conductor cross-sectional area of 8.5 mm ² . Can be confirmed. Moreover, from the results of Examples 4 and 5, it can be confirmed that the flexibility is greatly reduced when the insulator thickness exceeds 1.4 mm.

From the results of Example 6 to Example 10 (two-stage twisted electric wires) in Table 1, as the insulator thickness increases in the electric wire having a conductor cross-sectional area of 14.3 mm ² , the repulsive force increases and the flexibility decreases. Can be confirmed. Here, the electric wires of Examples 6 to 10 have thinner conductor wires than the electric wires of Examples 1 to 5. Accordingly, the electric wires of Examples 6 to 10 have a smaller repulsive force and higher flexibility than the electric wires of Examples 1 to 5. Moreover, from the results of Examples 9 and 10, it can be confirmed that the flexibility is greatly reduced when the insulator thickness exceeds 1.4 mm.

From the results of Examples 11 to 14 (three-stage twisted electric wires) in Table 1, the repulsive force increases and the flexibility decreases as the insulator thickness increases in the electric wire having a conductor cross-sectional area of 21.1 mm ² . Can be confirmed. Here, compared with the electric wires of Examples 6 to 10, the electric wires of Examples 11 to 14 have substantially the same wire diameter and a large cross-sectional area of the conductor. Accordingly, the electric wires of Examples 11 to 14 have a large repulsive force and low flexibility compared to the electric wires of Examples 6 to 10. Moreover, from the results of Examples 13 and 14, it can be confirmed that the flexibility is greatly reduced when the insulator thickness exceeds 1.4 mm.

  Examples 1 to 14 are evaluation examples in which the thickness of the insulator is changed in three types of conductors, but when the conductor cross-sectional area is large and small, the insulator thickness is the same. In the case where the conductor cross-sectional area is larger, the amount of the insulator covering the conductor is larger, so the repulsive force is larger. In this way, it is difficult to judge flexibility by simply comparing the insulator thickness for wires with different conductor cross-sectional areas, and it is necessary to compare the flexibility of wires with the same conductor cross-sectional area. It is.

  Next, electric wires (Example 15 to Example 18 in Table 2) having the same configurations as those of Examples 6 to 9 were prepared by solid extrusion molding, and the “thickness ratio” of the electric wires of Examples 6 to 9 and Examples 15 to 18 was obtained. Was evaluated.

  The electric wires of Examples 6 to 9 created by pull-down molding have a thickness deviation of 75% or more and high durability even when the insulator thickness is small. On the other hand, the electric wires of Examples 15 to 18 produced by solid extrusion molding have a thickness deviation of less than 75% even when the insulator is thick, and it can be confirmed that the durability is low. In full extrusion molding, if the conductor is thick and the insulation thickness is thin, the amount of resin will be small, so it will not be possible to suppress the shaking of the conductor during molding, and the conductor will deviate from the center axis of extrusion molding, resulting in a low thickness deviation rate. Inferred.

  1: electric wire, 2: conductor, 21: first stranded wire, 22: second stranded wire, 23: third stranded wire, 3: insulator

Claims (3)

A conductor, and an insulator containing a polyvinyl chloride resin covering the conductor,
The conductor is composed of a stranded wire in which a plurality of conductor wire diameters of 0.10 mm to 0.260 mm are twisted in two or more stages,
The cross-sectional area of the conductor is 5 mm ² or more and 50 mm ² or less,
The electric wire whose thickness of the said insulator is 0.8 mm or more and 1.4 mm or less.   The electric wire according to claim 1, wherein the insulator contains a plasticizer in an amount of 60 parts by mass to 120 parts by mass with respect to 100 parts by mass of the polyvinyl chloride resin.   The electric wire according to claim 1 or 2, wherein an uneven thickness ratio of the insulator is 75% or more.

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