JPH02181310A - Self-fusing cluster cable - Google Patents

Abstract

PURPOSE:To obtain a cluster cable with better flexibility and no generation of bubbles by twisting together a plurality of insulative wires each having a self-fusing layer or bundling them and then fusing these insulative wires with each other. CONSTITUTION:A self-fusing cluster cable is composed by twisting or bundling together insulative wires 15 each comprising an insulative layer 13 composed of resin such as polyhydantoinester and polyesteramide and a self-fusing layer 14 composed of thermoplastic resin such as epoxy resin and phenoxy resin and then melting the self-fusing layer 14 of each insulative wire 15 to fuse the insulative wires 15 with each other. Thus, pores 16 each having triangle like cross section are formed in the each portion where three of the insulative wires 15 adjoin with each other. Accordingly, the cluster cable, with not thick coating, better flexibility and no generation of bubbles in the self-fusing layer 14 due to minute gaps across the insulative wires 15, is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a self-bonding collective wire particularly suitable for high frequency transformers, deflection yokes, and the like.

[Conventional technology]

As this type of self-bonding collective wire, the one shown in FIG. 2 or 3 is known.

The self-fusing electricity collector m111 shown in FIG. It is made by twisting multiple strands together. The self-bonding wire assembly 1 shown in FIG. 3 is made by twisting a plurality of insulated wires 4 together and then forming a self-bonding layer 6 over the entirety of the twisted wires.

[Problem to be solved by the invention]

However, when the self-bonding collective wire shown in Fig. 2 is wound to form a coil, it is twisted and untwisted, and is susceptible to additional stress, and in some cases, the insulating layer 3 is deformed, causing problems such as a short circuit between the eyebrows of the coil.

On the other hand, in the case of the self-bonding collective wire shown in Figure 3, although there is no untwisting, the thickness of the entire coating layer becomes thick (thickness), which reduces flexibility and ease of handling, and makes it difficult to solder the terminals. Also, during manufacturing, when forming the self-fusing layer 6, the self-fusing layer 6 is foamed due to air remaining in minute portions of the strands.

(Means for Solving Problem , to solve the above problem.

[Effect]

Since the self-fusing layer is fused, the insulating strands adhere to each other, and are prevented from untwisting or unbundling during coiling. In addition, the thickness of the cover does not increase (it is highly flexible, and there is no air entrainment, so no foaming occurs).

The present invention will be described in detail below.

FIG. 1 shows an example of a self-bonding wire assembly according to the present invention, and reference numeral 11 in the figure indicates the self-bonding wire assembly. This self-bonding wire assembly 11 is made of copper.

4 types of copper alloy, aluminum, aluminum alloy, etc. 1
2, an insulating layer 13 made of resin such as polyurethane, polyvinyl formal, polyester, polyesterimide, polyhydantoin, polyamideimide, polyesteramideimide, polyhydantoin ester, polyesteramide, etc., and on this insulating layer 13, polyamide, polyvinyl butyral, Polysulfone, polysulfone ether.

After twisting or bundling together the insulating wires 15 on which the self-bonding R14 made of thermoplastic resin such as epoxy resin or phenoquine resin is formed, the self-bonding layer 14 of each insulating wire 15 is melted to create an insulating material. The wires 15... are fused together. Therefore, this collective wire +1
As shown in FIG. 1, there is a minute cavity 1 with a roughly triangular cross-sectional shape in the area where the three insulating wires 15 and - are adjacent to each other.
6... is formed. Furthermore, the resin constituting the self-bonding layer 14 is not limited to the above-mentioned thermoplastic resins, and may be heat-treated resins containing incyanate compounds, phenol resins, amine compounds, acid anhydrides, etc., to the above-mentioned thermoplastic resins. Curable resin can be used to improve heat resistance and adhesion after film winding.
Welding conditions and soldering can be selected as appropriate, taking into consideration the presence or absence of gender.

Next, a method for manufacturing such a self-bonding wire assembly will be described.

First, the insulating layer 13 and the self-bonding layer 14 are provided on the conductor 12 by a usual coating and baking method, extrusion coating method, etc., and the insulated wire 15 is manufactured. Next, a plurality of the insulating wires 15 are twisted or bundled together to form an aggregated state, and the self-fusing layers 14 are fused to each other. There are two methods for fusing the self-fusing layers 14.... Part 1
One is to introduce the assembled insulated wires 15 into a heating furnace or the like, and heat and melt the self-bonding layers 14 to perform fusing.

The heating conditions here are determined as appropriate depending on the resin constituting the self-bonding layer 14, but if a thermosetting resin is also used, it is necessary to maintain heat-melting properties in a semi-cured state, and the coil winding It must be completely cured during subsequent heating to complete line-to-line adhesion or inter-layer adhesion.

Other methods of fusing use solvents. That is,
The self-adhesive layer 14 is dissolved and swollen in a solvent, and then dried to perform adhesion. The solvent used here may be any solvent as long as it dissolves and swells the resin constituting the self-axis @M14, but the solvent selected differs depending on the resin, for example, the self-axis MlfFl 1
If the resin constituting 4 is polyvinyl butyral, methyl alcohol, ethyl alcohol, etc. are used as the solvent, and for phenokine resin, /chlorhexanone etc. are used.

Specific methods include a method of dropping the solvent onto the assembled insulated wires, a method of applying the solvent, and a method of running the solvent in a tank storing the solvent. Once the solvent dries, the self-adhesive layer 1
4 are bonded and fixed to each other, and the desired collective wire is obtained.

As shown in Figure 1, such a self-bonding collective wire has a self-bonding layer on its outer periphery, and the self-bonding layer has sufficient thermal meltability. After winding the assembled m-wires into a coil, heating is performed to melt the self-fusing layer again, making it possible to fuse the wires and layers of the coil.

Such a self-fusing collective wire has good high frequency characteristics and is particularly suitable for high frequency coils such as horizontal deflection coils of CRT display devices.

〔Example〕

- Polyester was applied to a conductor with a diameter of 0.12@a and baked to create an insulated wire (referred to as wire A) with an outer diameter of 0.16as.

・Coat the strand A with phenoxy resin as a self-bonding layer,
A self-bonding insulated wire (referred to as wire B) with a finished diameter of 0° and 19 m was prepared.

- Wire A was coated with polyvinyl butyral as a self-bonding layer to create a self-bonding insulated wire (referred to as wire C) with a finished diameter of 0.19 mm.

(Example 1) Seven strands of wire B were twisted together and then heat-fused at a temperature of 200°C to form a self-bonding collective wire.

(Example 2) After bundling seven strands B together, they were heated and fused at a temperature of 200° C. to form a self-bonding collective wire.

(Example 3) After seven strands of wire C were twisted together, ethanol was applied dropwise and dried to obtain a self-bonding wire assembly.

(Example 4) After bundling seven strands C together, ethanol was applied dropwise and dried to obtain a self-bonding collective wire.

(Comparative example 1) Seven strands of wire A were twisted to form a collective wire.

(Comparative example 2) Seven strands of wire B were twisted together to form a self-bonding collective wire.

(Comparative Example 3) Seven strands of wire were twisted together, and the entire wire was coated with phenoxy resin to obtain a self-bonding collective wire.

(Comparative Example 4) Seven pieces of bare VAA were bundled together, and the whole was coated with phenoxy resin to obtain a self-bonding collective wire.

The assembled wires obtained in these Examples and Comparative Examples were evaluated for: (1) self-bonding properties; (2) untwisting and unraveling of the strands; (0) opening properties; (2) presence or absence of foaming in the self-bonding layer; and (2) flexibility. The self-fusion property was determined by winding the collective wire into a coil, heating the coil at 170° C. for 15 minutes, and determining whether or not the coil could be fused. Regarding the untwisting and unraveling of the strands, the twist pitch should not vary by more than 5% when the stranded collective electric wire is wound in a fill manner, and the strands should not be untwisted when the bundled collective electric wire is wound into a coil. It was determined that there was no such thing. The removability was determined by the adhesion of solder (460° C., 2 seconds).

Foaming of the self-bonding layer was visually determined. The flexibility of the collective wire of Comparative Example 1 was determined by the Bosch method. Expressed as a relative value when O. These results are shown in Table 1.

As is clear from Table 1, the collective wire of the present invention has no untwisting or unraveling of the strands, and no foaming of the self-bonding layer.
It can be seen that the opening properties and flexibility are also good.

〔Effect of the invention〕

As explained above, the collective wire of the present invention is made by bundling or twisting a plurality of insulated wires having a self-bonding layer in the longitudinal direction, and fusing the insulated wires to each other. The insulated wire will not come apart or untwist during winding. In addition, since the coating thickness does not become thick, it has good flexibility and good soldering properties.

Furthermore, foaming of the self-bonding layer due to minute voids between the insulating wires does not occur. In addition, when manufacturing this assembled wire, there is no need to coat the assembled insulated wires with a self-bonding layer again, and the manufacturing equipment is simplified. This has the effect of making it possible to reduce the cost of two-piece construction.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing an example of the wire assembly according to the present invention, and FIGS. 2 and 3 are longitudinal cross-sectional views showing examples of conventional self-bonding wire collection wires. DESCRIPTION OF SYMBOLS 11... Self-fusing wire assembly, 14... Self-fusing layer, 15... Insulated strand.

Claims (1)

[Claims] 1. A self-bonding electrical assembly wire comprising a plurality of insulated wires each having a self-bonding layer bundled or twisted together in the longitudinal direction, the insulating wires being fused together.