JP2002237219A - Electric wire with welded layer and method of manufacturing electric wire with welded layer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric wire with a welded layer and a method of manufacturing the electric wire with the welded layer with favorable slipperiness in the surface of the electric wire and capable of thermally welding the welded layer at a low temperature. SOLUTION: In the electric wire 1 with the welded layer comprised by covering an insulator 3 on a conductor 2 and forming a welded layer 4 composed of a thermal self-welding material on the insulator 3, the welded layer 4 is composed of modified polyolefine. In the method of manufacturing the electric wire with welded layer by double layer extrusion of continuously extruding the insulator and the welded layer on the conductor, the welded layer is extruded at a temperature lower than an extrusion temperature of the insulator by 20-50 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire with a fusion layer, which is excellent in slipperiness and workability and can be fused at a low temperature, and a method for manufacturing the electric wire with a fusion layer.

[0002]

2. Description of the Related Art In general, electrical wiring for home appliances, such as automobiles and computers, requires wires for each purpose. For example, each electric wiring such as a CPU and a display device requires an electric wire having an insulating property. Electric wires used for electric wiring are generally used in which conductors are provided with an insulating coating layer, and these electric wires are used for connection between switch parts and the like. ing. As shown in FIG. 6, a plurality of electric wires 50 are formed of a tape 5 such as an adhesive tape.
The ends of the bundled electric wires 50 are joined to a connection component 52 such as a connector, and the connection component 52 can be connected to a switch component or the like.

[0003] However, the number of electric wires 50 is increasing with the recent development of technology. When the number of the electric wires 50 increases, the thickness when the electric wires 50 are bundled into one bundle is inevitably increased. The electric wire 50 is tied by winding an adhesive tape 51 around a bundle of the electric wires 50.
The work of winding 1 gradually becomes more difficult, which has led to a decrease in the work efficiency of electric wire connection.

For this reason, as shown in FIG. 7, an electric wire with a fusion layer 54 has been proposed in which a fusion layer 53 having a heat fusion property is provided on the outer layer of the electric wire 50 having a coating layer. The outermost layer of the electric wire with a fusion layer 54 is covered with a fusion layer 53 having a thermal fusion property, and a plurality of conductors having an insulator are arranged in parallel in a plane in an inner layer. Matching fusion layer 53
Each has a shape fused by heat.

[0005]

However, the heat-fusible resin used for the fusion layer 53 is a resin having a high melting point, such as a thermoplastic elastomer.
When performing the heat fusion process, there is a problem that the heat treatment temperature becomes high and a large amount of heat energy is consumed during the operation.

Further, since the heat treatment temperature is high, it is difficult to perform the operation, and the inside of the fusion layer is covered with an insulator. However, there is a possibility that high heat may adversely affect the insulator and the connector.

Further, the electric wire 54 with the fusion layer has a very high adhesiveness for the purpose of binding the electric wires. Therefore, the surface of the fusion layer 53 is easily sticky, and the electric wire 50
When the slipperiness of the surface of the electric wire 50 is deteriorated and the slipperiness of the surface of the electric wire 50 is deteriorated, the terminals of the electric wire 50 cannot be aligned, or the electric wires 50 cannot be taken out one by one, and a fusion layer is provided. The workability of the electric wire 54 was deteriorated.

An object of the present invention is to provide an electric wire with an adhesive layer and a method of manufacturing the electric wire with an adhesive layer, which can heat-seal the adhesive layer at a low temperature and has good slipperiness on the surface of the electric wire. is there.

[0009]

According to a first aspect of the present invention, there is provided an electric wire with a fusion layer, wherein a conductor is coated with an insulator, and a thermal self-fusion material is provided on the insulator. Wherein the fusion layer is made of a modified polyolefin. As described above, according to the first aspect of the invention, the slipperiness of the surface of the electric wire can be improved.

In order to achieve the above object, a method for manufacturing an electric wire with a fusion layer according to claim 2 is a method for producing an electric wire with a fusion layer by a two-layer extrusion process of continuously extruding and coating an insulator and a fusion layer on a conductor. In the method for manufacturing an electric wire with a fusion layer for producing an electric wire with a fusion layer, the extrusion temperature of the fusion layer is set to be performed at a temperature 20 ° C. to 50 ° C. lower than the extrusion temperature of the insulator. I have. As described above, according to the second aspect of the present invention, it is possible to provide an electric wire having good surface slipperiness, and to provide a method of manufacturing an electric wire with good workability.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the electric wire with a fusion layer and the method of manufacturing the electric wire with a fusion layer according to the present invention will be described. FIG. 1 shows an embodiment of the electric wire with a fusion layer according to the present invention. FIG. 1 is a perspective view of an electric wire with a fusion layer according to the present invention. In the figure, an electric wire 1 with a fusion layer covers an insulator 3 on a conductor 2 and the insulator 3
And a fusion layer 4 is formed thereon. By heating the fusion layer 4 which is juxtaposed with the electric wire 1 with the fusion layer in close contact therewith, it has a function of bonding adjacent fusion layers 4 to each other.

As the conductor 2, a copper wire used for an ordinary electric wire or the like is used.

The insulator 3 is made of a resin used for a coating layer of an ordinary electric wire, such as polyvinyl chloride (PVC), polyethylene (PE), and polypropylene (PP).

The fusion layer 4 is made of a modified polyolefin (for example, Sumika Atochem Bondine LX-4110) having an adhesive function to the polymer itself having a melting point of about 100 ° C. to 120 ° C.
Modified EEA having a melting point of 108 ° C., a softening point of 81 ° C., and a Shore D hardness of 42. The modified polyolefin is formed by using a functional group having an adhesive property as a modifier on a paraffinic hydrocarbon such as polyethylene or polypropylene. The fusion layer 4 is coated on each insulator 3. The bonding of the electric wires by the fusion layer 4 is performed by heating the fusion layer 4 with the electric wires closely contacting each other and juxtaposed in a plane.

In manufacturing a wire harness from such an electric wire 1 with a fusion layer, the electric wire 1 with a fusion layer is unwound from a reel or the like and has a predetermined length (for example, 10 m).
And peeled at each tip as shown in FIG.
Terminals are attached, and a plurality of wire harnesses 5 of FIG. 2 are heat-sealed and used as shown in FIG.

The heat fusion process according to the present invention is performed by heating the surface of the fusion layer 4 to a temperature at which the melting point is reached. Modified polyolefin is used for the fusion layer 4 and its melting point is 100 ° C.
Since the temperature is 120 ° C., the fusion layer 4 is heated to a temperature at which the modified polyolefin reaches the melting point. When performing fusion processing,
Since the surface of the fusion layer 4 needs to reach the melting point, the temperature during processing is preferably in the range of 110 ° C. to 130 ° C., which is about 10 ° C. higher than the melting point of the modified polyolefin. In addition, by setting the temperature at the time of processing to 110 ° C. to 130 ° C., even when the electric wire 1 with the fusion layer is processed as a wire harness and is fused, heat deterioration or thermal deformation of the insulator or the connector may occur. It can be prevented from affecting. By fusing the fusion layers 4 that have reached the melting point, a plurality of electric wires 1 with a fusion layer can be arranged in parallel.

FIG. 4 is a cross-sectional view of the wire harness 5 of FIG. In the figure, four wire harnesses 5 are arranged in parallel, and the wire harnesses 5 are fused to each other by a fusion portion 6 in the fusion layer 4. The fusion portion 6 is a portion where the fusion layer 4 is subjected to the heat fusion process.

As described above, when the modified polyolefin is used for the fusion layer 4, the electric wires 1 with the fusion layer can be heated to 110 ° C to 1 ° C.
It can be fused at a relatively low temperature of about 30 ° C.
Thereby, the workability when the operator performs the fusion working can be improved. Further, since the amount of heat consumed during the fusion processing can be reduced, the manufacturing cost of the electric wire 1 with the fusion layer can be reduced.

Further, the electric wire 1 with a fusion layer of the present invention is often used as a wire harness 5, and it is necessary to align the ends in the manufacturing process. 4 can suppress the stickiness of the surface, so that the end portions can be easily aligned. By using the modified polyolefin for the fusion layer 4,
Since the surface of the electric wire 1 with a fusion layer has good slipperiness, the electric wire 1 with a fusion layer with good workability can be formed.

Insulator 3 formed in this embodiment
Is set to a range of 0.15 to 0.50 mm for an electric wire having a conductor cross-sectional area of about 0.3 to ² mm ² . If the thickness of the insulator is thin, the insulating function is impaired, and if it is thick, the electric wire 1 with the fusion layer becomes heavy.

Fusion layer 4 formed in the present embodiment
Is set to a range of 0.03 to 0.25 mm for an electric wire having a conductor cross-sectional area of about 0.3 to ² mm ² . The thicker the fusion layer is, the easier the heat fusion process is. However, if the fusion layer is thick, the electric wire 1 with the fusion layer becomes heavy. Further, since the fusion layer does not have an insulating function, the fusion layer is configured to be as thin as possible without making the production of the fusion layer difficult.

FIG. 5 is a conceptual diagram showing a method of manufacturing the electric wire 1 with a fusion layer according to the present invention. In the figure, reference numeral 7 denotes a crosshead. The crosshead 7 is for two-layer extrusion, and is provided with two cylindrical fused layer extruders 8 and an insulator extruder 9. The conductor 2 is inserted into one end of the crosshead 7.
The conductor 2 inserted into the inside of the crosshead 7 has a fusion layer 4 and an insulator 3 formed by a fusion layer extruder 8 and an insulator extruder 9, and a fusion layer is provided from the other end of the crosshead 7. It is sent as an electric wire 1. The electric wire 1 with the fusion layer on which the fusion layer and the insulator are coated,
It is designed to be inserted into the cooling tank 10.

In this embodiment, a modified polyolefin is used for the fusion layer extruder 8 in the crosshead 7. The insulator extruder 9 uses a material used for coating an ordinary electric wire, such as polyvinyl chloride (PVC). These materials are continuously extruded in a two-layer extrusion system. That is, by extruding and coating the insulator 3 on the conductor 2, extruding the fusion layer 4 from above at a temperature lower by about 20 ° C. to 50 ° C. than the extrusion temperature of the insulator 3, and passing through the cooling bath 10, The electric wire 1 with the fusion layer is manufactured.

The fusion layer 4 is higher than the extrusion temperature of the insulator 3.
By performing the two-layer extrusion at a low extrusion temperature, the difference in the degree of heat shrinkage between the insulator 3 having a thick coating and a high extrusion temperature and the fusion layer 4 having a thin coating and a low extrusion temperature is expressed by: The surface of the fusion layer 4 becomes rough and rough. That is, it is possible to manufacture the electric wire 1 with the fusion layer in which the surface of the fusion layer 4 is not sticky.

The electric wire 1 with the fusion layer covered with the fusion layer 4 and the insulator 3 by the crosshead 7 is supplied to the cooling bath 10
Then, the fusion process is completed by cooling the fusion layer 4 and the insulator 3.

[0026]

Since the present invention is configured as described above, it has the following effects. According to the first aspect of the present invention, since the fusion layer of the electric wire with the fusion layer is made of the modified polyolefin, the surface of the fusion layer has good slipperiness and good adhesion. Since the electric wire with the layer can be formed, even when the electric wire with the fusion layer is processed into a wire harness or the like, the ends of the electric wire with the fusion layer can be easily aligned. According to the second aspect of the present invention, in the method of manufacturing the electric wire with the fusion layer, the extrusion temperature of the fusion layer is set to a temperature lower by 20 ° C. to 50 ° C. than the extrusion temperature of the insulator. Due to the difference in the degree of adhesion, it is possible to eliminate stickiness of the surface, to produce an electric wire with a fusion layer having good slipperiness and excellent workability.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an electric wire with a fusion layer according to the present invention.

FIG. 2 is a conceptual diagram showing a wire harness made of an electric wire with a fusion layer according to the present invention.

FIG. 3 is a conceptual diagram showing a state where a plurality of wire harnesses in FIG. 2 are fused.

FIG. 4 is a sectional view of the wire harness in FIG. 3;

FIG. 5 is a conceptual diagram showing a method for manufacturing an electric wire with a fusion layer according to the present invention.

FIG. 6 is a perspective view showing a conventional method of binding electric wires.

FIG. 7 is an end view showing a conventional electric wire with a fusion layer.

[Explanation of symbols]

 1 …………………………………………………………………………………………… Conductor 3 ……………………………… Insulator 4 ……… ………………………………………………………………………………………… Wire harness 6 ……………………………………………. Crosshead 8 ………………………………………………………………………………………………………………………………………… Insulator extruder 10 ………………………………………… Cooling tank

Claims (2)

[Claims] 1. An electric wire with a fusion layer comprising a conductor coated with an insulator and a fusion layer made of a heat self-fusion material formed on the insulator, wherein the fusion layer is modified. An electric wire with a fusion layer, which is made of polyolefin. 2. A method for producing an electric wire with a fusion layer by a double-layer extrusion process for continuously extruding and coating an insulator and a fusion layer on a conductor. Extrusion temperature should be 20 degrees higher than the extrusion temperature of the insulator.
A method for producing an electric wire with a fusion layer, wherein the method is performed at a temperature lower by 50C to 50C.