JPS63271826A - Manufacture of insulated wire - Google Patents

Abstract

PURPOSE:To improve the adhesion between a separator, a conductor, and an insulator and increase the extracting strength by longitudinally affixing the separator tape on a stranded conductor then pressing the separator tape between rubber rolls. CONSTITUTION:A stranded conductor 5 is inserted through a longitudinal tape affixing device 6, and a separator tape 7 is longitudinally affixed on the stranded conductor 5. The stranded conductor 5 longitudinally affixed with the tape 7 is inserted through a pair of rubber rolls 8, and the tape 7 is pressed to the outer periphery of the stranded conductor 5. Polyethylene with bridging agent is coated on it through an extruding machine 9. An insulator is heated and bridged, then it is wound on a drum. A CLP insulated electric wire thus generated has a structure that a tape 1 is strongly stuck to the outer periphery of a stranded conductor 4 and a CLP insulator 2 intrudes between element wires 3 on the outermost layer via this tape 1. The friction force between the tape 1 and the outer periphery of the stranded conductor 4 is thereby large, and the extracting strength of the conductor 4 is large.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a plastic insulating m&l with separator.
Relating to a method of manufacturing.

(Technical Background of the Invention) Conventionally, cross-linked polyethylene (hereinafter referred to as CLP) insulated wire (oamM) for outdoor use has been developed using hard copper stranded wire as a conductor.
When manufacturing polyethylene terephthalate (hereinafter referred to as PE'I') as a separator, in order to prevent the insulator from falling between the conductor wires due to the heat during crosslinking.

) is applied lengthwise over the stranded conductor and then immediately extrusion coated with OLP.

In addition, in manufacturing such OC wires, in order to prevent abnormal disconnection accidents caused by tensile stress applied to the conductor and conductor corrosion, the conductor is subjected to anti-rust treatment during wire drawing or twisting, and PE'l' tape, PE'f' tape and P
Benzotriazole (
Hereinafter, it will be referred to as BTA. ) Rust-preventive tape with a structure provided with a layer of rust-preventive agent is used as a seventh pallet.

(Problems with the Background Art) However, in this method of manufacturing 00 electric wires, the insulator is extruded and coated immediately after the separator tape is vertically applied, so as shown in FIG. The movement of the tape 1 is obstructed by the insulator 2, and the wire 3
I can't get in between. Therefore, the vertically attached separator tape 1 does not come into close contact with the outer peripheral surface of the stranded conductor 4.
Got 1! There was a problem that the conductor drawing strength of the wire was low.

(Purpose of the Invention) The present invention has been made to solve such problems, and has excellent adhesion between the conductor and the separator tape, and between the separator tape and the insulator, and has high conductor pull-out strength. The purpose of the present invention is to provide a method for manufacturing an insulated wire.

(Summary of the Invention) In other words, the method for manufacturing an insulated wire of the present invention includes vertically applying a separator tape onto a stranded conductor, and then passing the separator tape between a pair of rolls so as to extend the separator tape along the outer peripheral surface of the stranded conductor. It is characterized in that it is crimped and then extruded and coated with a plastic insulator.

In the present invention, as the separator tape, OC'#1
It is desirable to use a tape in which the base material is a plastic tape such as PET tape, which is commonly used as a separator for °C wires, and a layer of a rust preventive agent such as BTA is provided thereon by the method described below.

That is, a tape with a structure in which a coating layer of a rust preventive agent is provided on one side of a plastic tape with small holes or embossments as necessary, or a combination of the above plastic tape and a porous base such as PET nonwoven fabric. It is desirable to use a tape made by laminating materials and coating and impregnating a rust preventive agent on a porous base material.

(Example of the invention) Embodiments of the present invention will be described below based on the drawings.

In the embodiment, as shown in FIG. 1, after a plurality of hard copper strands are twisted together using a known twisting method (not shown), this twisted wire conductor 5 is attached to a tape vertical splicing device flf6. Then, the separator tape 1 is placed vertically on the stranded conductor 5. Next, 1 stranded conductor with separator tape attached vertically
The stranded conductor is passed between a pair of rolls 8 made of rubber or the like, and a separator tape 7 is pressed onto the outer peripheral surface of the stranded conductor, and then passed through an extruder 9 and polyethylene containing a crosslinking agent is coated thereon. Next, after crosslinking the insulator by heating by a known method, a drum (not shown) is formed.
Wind it up.

The OLP insulation TMS manufactured by such a method is
As shown in the figure, the separator tape 1 is tightly adhered to the outer circumferential surface of the stranded conductor 4, and the OLP insulator 2 extruded thereon is also applied via the separator tape 1 to the outermost layer fJ! It has a structure that extends between three rooms. Therefore, the frictional force between the separator tape 1 and the outer peripheral surface of the stranded wire conductor 4 is large, and the pull-out strength of the conductor is high.

(Effects of the Invention) As is clear from the above explanation, in the manufacturing method of the present invention, after the separator tape is vertically applied on the stranded wire conductor and before extruding the insulator, the separator tape is passed between rolls of rubber or the like. Since the separator tape and the conductor and insulator are pressure-welded, the adhesion between the separator tape and the conductor and insulator is good, resulting in an insulated wire with high pull-out strength.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the main parts of an example of the present invention, and FIG. 2 is an illustration of the OX, P insulated conductor obtained in the example. (Cross-sectional view of the QCC dispute,
FIG. 3 is a cross-sectional view of a conventional OC electric wire.

Claims (1)

[Claims] 1. After vertically attaching a separator tape on the stranded wire conductor, 1.
A method for manufacturing an insulated wire, which comprises passing the separator tape between a pair of rolls, crimping the separator tape along the outer peripheral surface of a stranded conductor, and then extruding a plastic insulator thereon. 2. The method for manufacturing an insulated wire according to claim 1, wherein the plastic insulator is a crosslinked polyethylene insulator. 3. The method for manufacturing an insulated wire according to claim 1 or 2, wherein the separator tape is a tape having a structure in which a rust preventive layer is provided on the surface of a base tape made of plastic.