JPS5916212A - Electric cable and method of producing same - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises forming a cable core by applying an insulator such as im or plastic on a conductor, and wrapping a semiconductor 1 with adhesive tape and horizontally winding a plurality of copper wires on the insulator. This invention relates to an electric cable provided with a shield and a method for manufacturing the same.

In recent years, with the increase in the capacity of electric cables, the cable size has become larger, and horizontally wound shielding of multiple strands of copper wire has been put into practical use instead of copper tape wrapping or copper wire braiding for the cable structure. .

Its basic structure is to wrap a semiconductive tape, which is made by frictionally imimu or plastic mixture with a volume resistivity of 103 to 144 Ω1, on a woven or nonwoven fabric made of natural or synthetic fibers, and wrap it around the cable insulation. Semi-conductive tape is usually wound with a pitch of 115 to V15, which is the pitch of horizontally-wound copper wire, but both sides of the semi-conductive tape are smooth. In the process of horizontally winding copper wire with tape, there are two types of sheathing machines: one that rotates the feeding side of the cable, and the other that rotates the winding side.
Although it is conceivable to use a twisting machine or a twisting machine, the present invention relates to a method of transversely winding copper wire using a winding machine or a twisting machine that rotates the winding side. When winding semiconductive tape and horizontally winding copper wire using a winding machine or a twisting machine that rotates the winding side, conventionally, the tape is first wound on the insulated wire core as it rotates. In this process, a semiconductive tape is wound on a machine at a pitch of 20 to 60 mm, and then a copper wire is placed vertically on top of the tape and wound at a pitch that corresponds to the rotation of the insulated wire core.

The number of rotations of the tape winding machine that winds the semiconductive tape is a condition that determines the limit of the manufacturing speed, that is, a rate-determining condition.

In addition, the diameter of copper wire for shiyahei is usually about 0.8 to 1.4 m.
, w, with a long pitch (100 to 500 f) on an insulated wire core wrapped with semiconductive tape.
f), such multiple strands of copper wire (usually 5
When 100 copper wires are wound on a semiconductive tape on an insulated wire core, the spacing between each copper wire is 1 to 1 ON.

The conventional manufacturing method described above requires a tape winding machine to wind the semiconductive tape during the manufacturing process, and the manufacturing speed is limited by the rotational speed capability of this tape winding machine. When the wire passes through the guide rollers during the manufacturing process or when it is wound onto the take-up citram, the insulated wire core shifts in one circumferential direction on the circumference. However, this method has the disadvantage that the spacing of the plurality of copper wires in the circumferential direction becomes uneven.

The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and it is an object of the present invention to provide a cable in which the spacing between the copper wires between the copper wires and b is maintained evenly as a cable structure, and to It provides a means for manufacturing. That is, the present invention is similar to the conventional tape in that the semiconductive tape is made of a woven or nonwoven fabric of natural or synthetic fibers and a semiconductive rubber or plastic mixture, but it is different from the conventional tape. Unlike the semiconductive tape, one side is provided with a row of protrusions aligned in a certain direction, and the surface with the protrusion row is placed on the outside and is wound on the insulator of the cable. The present invention provides a copper wire electric cable in which copper wires are arranged one by one and wound horizontally, and at the same time, the above-mentioned semiconductive tape and copper wire are both vertically attached to the surface of the insulator of the cable as it progresses. In addition, these are the pitches of the rotation progress of the insulated wire core (100 to 500ff
), it is possible to manufacture a high-quality Jahei cable, and it also provides a manufacturing method with improved manufacturing efficiency since a tape winding machine is no longer required.

Next, the present invention will be explained with reference to the drawings. FIG. 1 shows an example of the electric cable of the present invention.

On the conductor 1, an inner semiconductive layer 2, an insulator 3, a semiconductive tape wrap (outer semiconductive layer) 4, a copper wire for insulation 5, and a plastic sheath 6 made of polyethylene, polyvinyl chloride, etc. are sequentially arranged. It has been established. Figure 2 shows an example of the semiconductive tape used in the electrical cable shown in Figure 1, which is a woven fabric made of natural or synthetic fibers made of a rubber or plastic mixture mixed with conductive carbon black to make it conductive. Protrusions γ are formed on one side by processing cloth or nonwoven fabric with rolls or other means.
are arranged in several rows at regular intervals (four rows in the figure). Of course, the shape of this protrusion is not limited to the shape shown in the figure, but may be arbitrary.

To manufacture the electric cable of the present invention, as shown in FIG. During winding, while rotating the winding side, first attach a semiconductive tape 4 as shown in FIG. External deflection is performed by feeding one strip of 5.

After this, a plastic sheath, such as a polyethylene or vinyl chloride sheath, can be applied to obtain the cable of the invention.

The present invention has such a cable structure, and since one copper wire is arranged between the rows of protrusions in the longitudinal direction of the semiconductive tape, there is no possibility that the copper wire will collapse during the cable manufacturing process. Also, there is no need to wrap the insulated core of the cable at the rotating pitch (100 to 5000).
In particular, tape wrapping can be produced without the need for a machine.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example of the electric cable of the present invention;
FIG. 2 is a perspective view showing an example of the semiconductive tape used in the present invention, and FIG. 6 is an explanatory diagram showing the main part of the manufacturing process of the electric cable of the present invention. 1... Conductor 2... Internal semiconductive layer 3... Insulator 4... Semiconductive tape winding 5... Copper wire for shielding 6... Silastic sheath 7... protrusion agent
Patent Attorney Mamoru Takeuchi Figure 1, 3rd PJ

Claims (1)

[Claims] (1) A semi-conductive tape wrapping layer having a row of protrusions arranged in a certain direction on the outer surface is provided on the cable insulator, and a plurality of semi-conductive tape layers are provided between the protrusion rows of the semi-conductive tape. An electric cable characterized by having a barrier layer made of individually arranged and wound metal wires (2) A semi-conductive tape is attached to a woven or non-woven fabric made of natural fibers or synthetic fibers. The electric cable (3) according to claim 1, which is made of conductive rubber or plastic and has a row of protrusions aligned in a certain direction on one side while rotating the insulated wire core at a constant speed. Let it proceed,
A semi-conductive tape having a row of protrusions aligned in a certain direction on one side is attached vertically to the advancing insulated wire core with the smooth side inside, and a plurality of copper wires are interposed between the rows of protrusions of the semi-conductive tape. A method for manufacturing an electric cable, characterized by vertically attaching the cables while arranging them individually.