JPS58140917A - Method of producing watertight insulated wire - 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 mainly relates to a method of manufacturing an outdoor crosslinked polyethylene insulated wire (hereinafter referred to as 0C-W wire) having a watertight stranded conductor.

Prior art "Fig. 1" is an explanatory diagram of a method of manufacturing the above-mentioned 0a-W electric wire. 10 is a stranded conductor, which travels in the direction of arrow 12;

The stranded wire conductor 10 is preheated by a conductor preheating device 14 (for example, an induction heating method), and then passed through a long die 18 of an extruder 16, and a high temperature and high pressure watertight compound 20 is press-fitted therein (FIG. 2).

An insulator 24 (crosslinked polyethylene) is then extruded and coated by another extruder 22 (FIG. 3).

Then, it passes through the bridge tube 26.

The bridging cylinder 26 is of a known catenary type, and the inside thereof is filled with high-pressure water vapor.

However, the above manufacturing method has the following problems.

In other words, watertight pound 20 is 140~1800c
The stranded wire conductor 10 is press-fitted at a high temperature of about Ii. Further, since the wire conductor 10 is preheated as described above, the compound after being press-fitted is not immediately cooled and solidified, and the outermost layer of the compound enters the extruder 22 with a low viscosity.

Therefore, due to the pressure of the insulator 24 to be coated and the pressure inside the bridging tube 26, the low viscosity watertight foam pound 20 in the troughs 11 (FIG. 2) of the strands on the surface of the stranded wire conductor 10 is extruded. It occurs that the insulator 24 is pushed back into the nipple of the machine 22 and falls into the valley 11.

Also, the viscosity between the watertight compound and the insulator 24 to be coated is
□□ Due to the difference, interfacial slip occurs and the stranded conductor 1
0 linear velocity is incompletely transmitted to the insulator 24 and the insulator 2
4 variations in the outer diameter occur.

The object of the present invention is to provide a method for manufacturing a watertight insulated wire that does not cause the above-mentioned problems.

Embodiment ``Figure 2'' is characterized in that a high-temperature watertight compound is press-fitted into the stranded wire conductor 10, cooled and solidified, and then extruded and covered with the insulator 24. Cool the conductor 10 with cooling water 2
8 and a water-cooled take-up capstan filter 0.

The water-cooled take-up capstan 60 is, for example, a horizontal capstan 32 whose majority is immersed in cooling water 34 and a shower 36 of the cooling water 34 is applied from above. The reason for using the capstan filter 2 will be described later.

8 is an air wiper.

The high-temperature watertight compound press-fitted in the extruder 16 is cooled and solidified by the cooling water tank 28, and is further sufficiently cooled in the water-cooled capstan 60.

Then, moisture is removed in an air wiper 68,
Enters extruder 22. At that time, the compound in the valleys 11 between the wires on the surface of the stranded conductor 10 is sufficiently hardened, so that when the insulator 24 is coated, it will not be pushed back into the pull as described above. do not have.

Furthermore, since the extruded insulator 24 and the stranded wire conductor 10 have good adhesion, no slipping occurs, and therefore no variation in the outer diameter of the insulator 24 occurs.

The reason why the stranded wire conductor 10 is taken up by the water-cooled taking-off capstan 30 is as follows.

Generally, a catenary-type bridging tube 26 is used for bridging a 00-W electric wire, as described above.

However, as mentioned above, the long die 18 of the extruder 16
In this case, several tens of atmospheres are applied to the stranded wire conductor 10 due to the press-fitting of the watertight compound 20, and this force acts as a brake on the stranded wire conductor 10.

On the other hand, the electric wire coated with the insulator 24 is wound on the right side (not shown) in "Figure 1" or "Figure 1", but the wire conductor 10 is wound up as described above.
If the brake is applied, the tension will become excessive. the result,
The electric wire becomes taut within the bridge tube 26, and catenary control becomes impossible.

However, when the capstan 62 pulls the wire as described above, the braking force acting on the stranded conductor 10 is canceled out. As a result, catenary control becomes possible, and the bridge tube 2
This allows the wires to pass through the 6 normally.

In the case of "Figure 1" above, the compound on the conductor surface is cooled by the cooling water funnel 28 before entering the water-cooled take-up capstan 30, so it does not stick to the capstan filter 2.

Furthermore, the type of the water-cooled take-up capstan 30 may be either a vertical type (pile-shaped) or a horizontal type (as shown in Figure 2), in addition to the horizontal type shown in Figure 1.

Because of the effect of the invention, after the wire conductor 10 is extruded and press-fitted in a watertight manner, it is once cooled and then the insulator 24 is extruded and covered. There is no pushing back of the watertight compound and there is no dropping of the insulation.

Furthermore, no slipping or slipping occurs between the stranded wire conductor 10 and the insulator 24, and therefore, there is no variation in the outer diameter of the insulator.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the prior art, Fig. 2 is an explanatory diagram of a stranded wire conductor 10 filled with a watertight compound 20, Fig. 3 is a cross-sectional view of an electric wire coated with an insulator 24, and Fig. Detailed explanatory diagrams: Figures 5 and 2 are explanatory diagrams of different types of water-cooled take-off capstans 6°. 10: Stranded wire conductor 16: Extruder 20: Watertight compound 22: Extruder 24: Insulator 26: Bridge tube 28: Cooling water tank 30: Water-cooled take-back capstan Patent applicant Fujikura Electric Wire Co., Ltd. Agent Keiji Kaihei Figure 5 Figure 6

Claims (3)

[Claims] (1) In a method for manufacturing a watertight insulated wire, in which a high-temperature, high-pressure watertight compound is press-fitted into a stranded wire conductor using an extruder, and then an insulator is extruded and coated on top of the watertight compound, the watertight compound extruder and the insulator A method for producing a watertight insulated wire, characterized by providing a take-up capstan between the extruder and the extruder. (2) The method for manufacturing a watertight insulated wire according to claim 1, characterized in that the take-up capstan is a water-cooled take-up capstan. (3) In a method for manufacturing a watertight insulated wire, in which a high-temperature, high-pressure watertight compound is press-fitted into a stranded wire conductor using an extruder, and then an insulator is extruded and coated on top of the stranded wire conductor. 1. A method for manufacturing a watertight insulated wire, comprising: once cooling a wire conductor, and then extruding the insulator. (l) Manufacturing of a watertight insulated wire according to claim 3, characterized in that the means for cooling the stranded wire conductor comprises a cooling water tank and a water-cooled take-off capstan. Method.