JPS5893114A - Method of producing watertight insulating 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 relates to a method for manufacturing watertight insulated wires. Conventional methods for producing this type of watertight insulated wire include:

Immediately before the stranding machine, each strand is immersed in a compound bath to adhere watertight compound to the strands.

Stranded wire or a central element with a larger diameter than other strands.
A gap was created between each twisted wire using a strand, and then a watertight compound was filled from the outside. However, although the above-mentioned method of immersing the wire in a compound bath can be expected to sufficiently fill the watertight compound, the twisting machine etc. become contaminated with the watertight compound, which requires a considerable amount of time and effort to remove. .

In addition, the method of using a central strand with a larger diameter than other strands is
Since minute gaps are continuously and stably provided in the twisted wires, sufficient filling of the honey compound can be expected.
This method has drawbacks such as the finished outer diameter of the wire becomes large and additional conductor material is required.

The present invention was made to eliminate these drawbacks, and its gist is that the area around the central strand is coated with a relatively high viscosity water-tight compound (hereinafter simply referred to as water-tight compound). The object of the present invention is to provide a method for manufacturing a water-insulated electric wire in which a suitable number of strands are twisted together and then a water-tight compound is filled from the outside.

Next, the present invention will be explained in detail based on drawings showing one embodiment of the present invention. Fig. 1 is a cross-sectional view of a watertight insulated wire of the present invention, where 1 is a central element #S, 2 is an element l1iI, and 5 is a watertight insulated wire. 4 is a stranded wire, and 5 is an insulating layer.

A watertight compound 3 is applied to such a central strand 1 to make it larger in diameter than the other strands 1II2, and an appropriate number of other strands are placed around the outer periphery. 12, out of the watertight compound 3 attached to the outer part of the central strand 1, the part where the central layer fj11 and other strands 2 come into contact is extruded and
Most of it flows into the gap formed between the wire and the other wire 2, and partially fills the gap. However, since some of the watertight compound 3 remains between the center strand 1 and the other strands 2, the outer diameter of the center strand 1 acts as if it were slightly larger than the outer diameter of the other strands 112. As a result, the first layer of bare wires caused some laughter. This will gradually expand and act on the second and third layer strands, and the smile will become thicker as the layers increase.

Next, a watertight compound 3 is applied from the outer periphery of the strands 114 where such a slight twist has occurred, and the compound 3 is used to fill the gaps between each layer.

FIG. 2 is an explanatory diagram showing the method for producing a watertight insulated wire according to the present invention, in which a stranded wire 4 whose central strand 1 is coated with a watertight compound 3 is adjusted to (60 to 70°C) while being fed out from a feeding machine 6. After being guided to the heated heating cylinder 7 and preheated.

The watertight compound is supplied to the extruder 8, where high pressure is applied to the outside of the stranded wire 4, and the watertight compound 1 is filled in the lower part between the first layer and the second layer, and further to the outside thereof, to form an extruded watertight insulated wire. It is.

As described above, the present invention pre-fills the watertight compound in the central wire and the first layer wire, which are most difficult to fill with the watertight compound, and also achieves a large diameter effect by applying the watertight compound to the center layer wire. Use #1
Since a slight gap is generated between the wires of each layer from the first layer onwards, it is easy to press-fit the watertight compound, and it has the effect of being able to reliably fill up to the center layer, while also reducing the finished outer diameter as much as possible. Since it becomes smaller, the economic effect when realizing low integrity is also large.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a watertight insulated wire of the present invention, and FIG. 2 is an explanatory diagram showing a method of manufacturing a watertight insulated wire of the present invention. 1----”-center strand, 2----one strand, 5
．． ----1 watertight combined, 4---1 stranded wire, 5---1 insulating layer.

Claims (1)

[Claims] Watertight, characterized in that an appropriate number of wires are twisted around a core wire coated with a watertight compound, then a watertight compound is filled from the outside, and an insulating layer is further extruded and coated on top of it. Method of manufacturing insulated wire.