CN107945933B

CN107945933B - Electric wire and method for manufacturing same

Info

Publication number: CN107945933B
Application number: CN201710952939.1A
Authority: CN
Inventors: 远藤仁; 铃木明美; 花房幸司
Original assignee: Sumitomo Electric Industries Ltd
Current assignee: Sumitomo Electric Industries Ltd
Priority date: 2016-10-13
Filing date: 2017-10-13
Publication date: 2020-12-01
Anticipated expiration: 2037-10-13
Also published as: CN107945933A

Abstract

The invention provides a thick and flexible electric wire and a manufacturing method thereof. An electric wire comprising a conductor and an insulator, wherein the insulator covers the conductor and contains a polyvinyl chloride resin, the conductor is composed of a twisted wire formed by twisting a plurality of conductor element wires in 3 stages or more, and the cross-sectional area of the conductor is 20mm or more²The force of pulling the conductor out of the insulator is greater than or equal to 2N and less than or equal to 20N.

Description

Electric wire and method for manufacturing same

Technical Field

The present invention relates to an electric wire and a method for manufacturing the same.

Background

Patent document 1 discloses an insulated wire comprising a conductor and an insulator covering the outer periphery of the conductor, wherein the insulator contains a chlorinated vinyl chloride resin and a vinyl chloride thermoplastic elastomer.

Patent document 1: japanese patent laid-open publication No. 2015-225837

Disclosure of Invention

For a thick wire, flexibility is required such that a ferrite core can be easily wound with a plurality of turns.

The invention aims to provide a thick and flexible electric wire and a manufacturing method thereof.

The electric wire of the invention comprises a conductor and an insulator, wherein the insulator covers the conductor and contains polyvinyl chloride resin,

the conductor is composed of stranded wires formed by stranding a plurality of conductor element wires in more than or equal to 3 stages,

the cross-sectional area of the conductor is greater than or equal to 20mm²，

The force of pulling the conductor out of the insulator is greater than or equal to 2N and less than or equal to 20N.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, a thick and flexible electric wire can be provided.

Drawings

Fig. 1 is a cross-sectional view showing an example of an electric wire according to an embodiment of the present invention.

Description of the reference numerals

1: electric wire

2: conductor

21: first twisted wire

22: second twisted wire

23: third twisted wire

3: insulator

Detailed Description

[ description of embodiments of the invention ]

First, the contents of the embodiments of the present invention will be described.

The electric wire according to the embodiment of the invention of the present application,

(1) comprises a conductor and an insulator covering the conductor and containing a polyvinyl chloride resin,

the cross-sectional area of the conductor is greater than or equal to 20mm²，

According to this structure, a thick and flexible electric wire can be provided.

(2) In addition, the electric wire of (1),

the base line diameter of the conductor base line is less than 0.15 mm.

According to this structure, a more flexible electric wire can be provided.

(3) The electric wire of (1) or (2) wherein the insulator contains a plasticizer in an amount of 60 parts by mass or more and 120 parts by mass or less based on 100 parts by mass of the polyvinyl chloride resin.

According to this structure, a further flexible electric wire can be provided.

(4) The electric wire of (1) or (2) wherein the insulator contains a plasticizer in an amount of 70 parts by mass or more and 120 parts by mass or less based on 100 parts by mass of the polyvinyl chloride resin.

According to this structure, a further more flexible electric wire can be provided.

(5) Further, a method for manufacturing an electric wire, which is the method for manufacturing an electric wire according to any one of (1) to (4),

and coating the insulator on the conductor by stretching forming.

According to this structure, a particularly flexible electric wire can be provided.

Detailed description of embodiments of the invention

Next, an embodiment of the electric wire and the method for manufacturing the same according to the present invention will be described with reference to the 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 drawing, 1 denotes an electric wire, 2 denotes a conductor, 21 denotes a first twisted wire, 22 denotes a second twisted wire, 23 denotes a third twisted wire, and 3 denotes an insulator. The electric wire 1 of the present embodiment includes a conductor 2 and an insulator 3 covering the conductor 2.

The cross-sectional area of the conductor 2 is greater than or equal to 20mm²The third twisted wire 23 is formed by twisting 7 second twisted wires 22. The second twisted wire 22 is formed by twisting 7 first twisted wires 21. The first twisted wire 21 is formed by twisting a plurality of conductor element wires made of metal. By adopting the above-described structure in which the conductors are twisted in 3 stages, a gap is formed between the conductors, and thus flexibility can be ensured.

The conductor element is not particularly limited, and may be made of copper, copper alloy, tin-plated copper, aluminum alloy, or the like. In addition, the diameter of the conductor element wire is preferably less than 0.15 mm. If a conductor element wire of a small diameter is used, the element wire itself is soft, and therefore a more flexible wire can be obtained. The diameter of the conductor baseline may be greater than or equal to 0.1 mm.

The first twisted wire 21 is formed by twisting a plurality of conductor element wires (first-stage twisting). The number of conductor element wires constituting the first twisted wire 21, the twisting direction of the first-stage twisting, and the twisting pitch are not particularly limited as long as the operational effect of the present invention is not impaired, and in the case of AWG1 and AWG1/0 electric wires, the ranges shown in table 1 are preferable.

The second twisted wire 22 is formed by twisting 7 first twisted wires 21 (second-stage twisting). The twisting direction and the twisting pitch of the second-stage twisting are not particularly limited as long as the effect of the present application is not impaired, as in the case of the first-stage twisting, and in the case of the AWG1 and the AWG1/0 electric wire, the ranges shown in table 1 are preferable.

The third twisted wire 23 is formed by twisting 7 second twisted wires 22 (third-stage twisting). The twisting direction and the twisting pitch of the third-stage twisting are not particularly limited as long as the effect of the present invention is not impaired, as in the case of the first and second-stage twisting, but in the case of AWG1 and AWG1/0 electric wires, the ranges shown in table 1 are preferable.

[ TABLE 1 ]

The insulator 3 contains polyvinyl chloride resin. The content of the polyvinyl chloride resin is not particularly limited, and is, for example, 20 to 80% by mass, preferably 20 to 58% by mass. The insulator 3 may contain the plasticizer in an amount of 60 parts by mass or more and 120 parts by mass or less, preferably 70 parts by mass or more and 120 parts by mass or less, and more preferably 70 parts by mass or more and 90 parts by mass or less, based on 100 parts by mass of the polyvinyl chloride resin. This can further ensure flexibility of the insulator 3. The plasticizer is not particularly limited as long as it is a plasticizer generally used for an insulator of an electric wire, and examples thereof include: trimellitate (tri (2-ethylhexyl) trimellitate, tri-n-alkyl trimellitate, triisononyl trimellitate, triisodecyl trimellitate, tri-n-octyl trimellitate, etc.), and polyester plasticizers.

In addition to the above, 1 or 2 or more kinds of various additives such as a filler, a flame retardant, an antioxidant, a stabilizer, and a pigment may be added to the insulator 3.

The electric wire 1 is manufactured by covering a conductor 2 composed of a twisted wire twisted in 3 stages with an insulator 3 by stretch molding. If the wire is manufactured by drawing, a gap is formed between the conductor 2 and the insulator 3, and excellent flexibility of the wire 1 can be obtained, which is preferable. The thickness of the insulator may be set to 0.6mm to 3.0 mm.

With the electric wire 1, a force of pulling out the conductor 2 from the insulator 3 (hereinafter, referred to as a pull-out force) is greater than or equal to 2N and less than or equal to 20N. Here, the pull-out force is correlated with the flexibility of the electric wire, and the smaller the pull-out force is, the higher the flexibility of the electric wire is. If the pull-out force is less than or equal to 20N, winding onto the ferrite core becomes easy. From the viewpoint of flexibility of the electric wire, the pull-out force is preferably 8.5N or less, and more preferably 8.3N or less. On the other hand, if the pull-out force is 2N or less, the conductor is flexible, but easily moves with respect to the insulating layer, and there is a problem that the exposed length of the conductor cannot be made constant when the insulator is removed. With this configuration, a thick and flexible electric wire can be obtained.

The above-described pull-out force was evaluated as follows. First, a cut was formed in an insulator of an electric wire, and the insulator was peeled by moving in a longitudinal direction to produce an electric wire divided into a covering portion having a length of 22mm and a conductor portion having a length of 20 mm. Then, the conductor part was pulled out at a speed of 200mm/min while holding the conductor part, and the maximum value during the period of 22mm pulling out was defined as the pull-out force (N).

While the embodiment of the present invention has been described with reference to fig. 1, as another embodiment of the present invention, an electric wire including: a conductor composed of a fourth twisted wire in which 12 second twisted wires 22 are further twisted around the outer periphery of the third twisted wire 23, that is, a conductor in which a plurality of conductor element wires are twisted in 4 stages. In this case, the twisting direction and the twisting pitch of the first to fourth steps of twisting are not particularly limited as long as the effect of the present application is not impaired, and it is preferable to set the ranges shown in table 2 if the wires are AWG2/0, AWG3/0, and AWG 4/0.

[ TABLE 2 ]

[ examples ] A method for producing a compound

The following describes modes for carrying out the invention with reference to examples. The examples do not limit the scope of the invention.

The electric wires of examples 1 to 7 shown in tables 3 and 4 were produced by stretch molding, and the pull-out force and flexibility of the electric wires of examples 1 to 5 were evaluated. For the insulation of all the electric wires, a material containing 100 parts by mass of a polyvinyl chloride resin, 90 parts by mass of tris (2-ethylhexyl) trimellitate, 10 parts by mass of a stabilizer, 10 parts by mass of a filler, and 5 parts by mass of a flame retardant was used. The "number of second strands" twisted in the fourth stage of examples 5 to 7 indicates the number of second strands twisted on the outer periphery of the third strands.

Pull-out force

A cut is formed in an insulator of an electric wire, and the insulator is peeled by moving in a longitudinal direction to produce an electric wire divided into a covering part having a length of 22mm and a conductor part having a length of 50 mm. Then, a part of the covering portion was gripped, the conductor portion was pulled out at a speed of 200mm/min, the pull-out force was measured by a load cell, and the maximum value during the period of 22mm pulling-out was defined as the pull-out force.

Flexibility

The wire of a predetermined length was bent in a U-shape so that the curvature radius became 100mm, and sandwiched between a pair of plate materials, and the wire was further bent until the curvature radius became 50mm, and the repulsive force at that time was used as an index of flexibility. The approaching speed of the sheet was set to 100mm/min, and the total of the contact lengths of the electric wire and the sheet material at the start of the evaluation was set to 300 mm.

Furthermore, a correlation was found between the flexibility and the pull-out force, and if the pull-out force is less than or equal to 20N, a flexible electric wire is obtained.

As is clear from the results in Table 3, the cross-sectional area of the conductor was 20mm or more²The conductor is formed of a twisted wire obtained by twisting a plurality of conductor element wires in 3 stages or more, and a thick wire having a pull-out force of 2N or more and 20N or less is flexible.

[ TABLE 3 ]

[ TABLE 4 ]

Further, the electric wire of example 8 having the same structure as that of example 1 shown in table 3 and the electric wires of examples 9 to 12 having the same structures as that of example 1 shown in table 3 except that the composition of the insulator was different were produced by stretch forming, and the pull-out force of each electric wire was evaluated. The compositions of the insulators and the pull-out forces of the wires of examples 8 to 12 are shown in table 5.

[ TABLE 5 ]

As shown in table 5, the electric wires of examples 8 to 11, in which the insulator contains tris (2-ethylhexyl) trimellitate in an amount of 60 parts by mass or more and 120 parts by mass or less based on 100 parts by mass of the polyvinyl chloride resin, had a pull-out force of 20N or less, more specifically 12N or less. As shown in table 5, the pull-out force of the electric wire of example 12 in which the insulator contained 50 parts by mass of tris (2-ethylhexyl) trimellitate per 100 parts by mass of the polyvinyl chloride resin was greater than 20N.

Claims

1. An electric wire comprising a conductor and an insulator which covers the conductor and contains a polyvinyl chloride resin,

the base line diameter of the conductor base line is less than 0.15mm,

the cross-sectional area of the conductor is greater than or equal to 20mm²，

A force of pulling the conductor out of the insulator is greater than or equal to 8N and less than or equal to 12N,

the insulator contains a plasticizer in an amount of 60 parts by mass or more and 90 parts by mass or less relative to 100 parts by mass of a polyvinyl chloride resin,

between the conductor and the insulator, a gap is formed which is generated by stretch forming of the insulator.

2. The electrical wire according to claim 1,

the insulator contains a plasticizer in an amount of 70 parts by mass or more and 90 parts by mass or less with respect to 100 parts by mass of the polyvinyl chloride resin.