JPS6023912A - Self-bondable 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 self-adhesive electric wire, and more specifically, to a self-adhesive electric wire that is used by connecting electric wires having rectangular cross sections in parallel.

Conventional self-adhesive wires are enamelled wires or powder coated wires.
It was made with an overcoat of solid adhesive. Generally, enameled wires with a rectangular cross-sectional shape tend to have a thick coating of enamel on the flat parts or corner parts, depending on the viscosity, interfacial tension, baking temperature, etc. of the enamel face.

This tendency is particularly remarkable for polyvinyl formal.

However, considering the withstand voltage, it is preferable to coat the corners thickly, and commercially available rectangular self-adhesive wires are
It has the shape shown in Figure 1. This figure is a trace of a microscopic photograph, and shows a rectangular conductor l coated with a layer of polyvinyl formal and adhesive.

As is clear from the figure, when such self-adhesive electric wires are bonded in parallel, only a portion of the corner is bonded, and the bonding area is often about 120 to 30 inches.

As mentioned above, in the case of rectangular wires, consideration of withstand voltage is given priority, so self-adhesive wires must be enamelled wires, and some corners must be coated thickly. It seems like I'm putting it away.

However, as with some transformers and accelerators, there are concerns about adhesive strength rather than withstanding voltage. In fact, in some cases, the withstand voltage between the strands may be as low as several tens of volts. In such a case, enamel A/? f! I have no choice but to think that the use of A is excessive quality.

The present invention was made in view of the above circumstances, and aims to provide a self-adhesive electric wire with excellent adhesive strength by applying a solid, electrically insulating adhesive to a rectangular conductor. This is the purpose.

An embodiment of the invention will be described with reference to FIG.

In the figure, electrically insulating solid adhesive 3 is attached to a rectangular conductor l.
It is made by coating. As the adhesive 3, solid polyester, polyamide, phenoxy resin, phenol resin, epoxy resin, etc. are suitable. Although the self-adhesive wire is simply a bare wire coated with a solid adhesive 3 on its outer surface, it has several advantageous features as described below.

(1) Since only adhesive is applied, this self-adhesive electric wire is cheaper than the conventional self-adhesive electric fused enameled wire.

(2) Since bare wire has no unevenness on its flat surface, the adhesive area ratio is much larger than that of self-adhesive enamelled wire. This alone will improve the adhesive strength.

(3) If the adhesive applied to the enamels # and W does not have the same flexibility as the enamel film, crazing of the adhesive will occur, which will cause cracks in the enamel film. On the other hand, in the case of the present invention, there is no such concern because adhesive is simply applied to the bare wire. This expands the range of adhesive choices.

(4') Regarding the temperature during bonding, in the conventional case, the heat resistance of the enamel coating must be considered, but any temperature can be selected for bonding the bonded wire of the present invention.

In the above item (2), since the number of adhesive layers can be reduced to 5, the space factor of the adhesive conductor can be improved. In paragraph (3),
It is not necessary to select an oligomer adhesive from the viewpoint of flexibility. Since a reactive adhesive with a relatively low molecular weight can be selected, an adhesive with excellent heat resistance can be used. or,(
For item 11, it is possible to use a self-adhesive adhesive such as polyimide, which has excellent heat resistance. Furthermore, it is easy to cause the adhesive film to maintain an electrically insulating function.

As explained above, since the present invention is made of bare wires and coated with adhesive, it has the advantage that excellent adhesive strength can be obtained at low cost.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional device, and FIG. 2 is a sectional view of an embodiment of this kotomei. l...Conductor, 3...Adhesive. In each figure, the same reference numerals indicate the same or corresponding parts. Agent Masuo Oiwa

Claims (1)

[Claims] A self-adhesive electric wire comprising a conductor with a rectangular cross section and a solid adhesive having electrical insulation properties applied to the outer surface of the conductor.