JPH08227615A - Bonded type transposed wire and cable - Google Patents

Abstract

PURPOSE: To provide a bonded type transposed wire, which has the excellent flexibility and stabilized adhesiveness and of which design and manufacture are facilitated, by coating an insulated wire with the powder of adhesive resin so as to provide an adhesive resin layer. CONSTITUTION: As a conductor, a flat copper wire 1 having a cross section of 2.1mm×5.7mm is used, and the periphery thereof is provided with an insulating cover layer 2 made of polyvinyl formal so as to obtain an insulated wire 3. Powder of the epoxy type resin, which has a particle diameter at 100 mesh bus, is adsorbed onto this insulated wire 3 by static electricity so as to form an adhesive resin layer 4. Eleven wires 11 are twisted, and powder of the epoxy type resin is adsorbed again by the static electricity, and a polyethylene terephthalate tape is wound around them so as to form an integral cover layer 5, and a bonded type transposed wire is thereby obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive type transition electric wire or cable which has excellent flexibility and stable adhesiveness, and at the same time is easy to design and manufacture.

[0002]

2. Description of the Related Art As a conventional adhesive-type dislocation electric wire, one having a cross-sectional view shown in FIG. 1 is generally used.
In FIG. 1, reference numeral 1 is a rectangular conductor, and an insulating coating layer 2 formed by applying and baking an insulating varnish is provided on the conductor 1 to form an insulating strand 3. Further, an adhesive varnish is applied on the insulating wire 3 and dried to form B-
The adhesive resin layer 4 in a stage state (semi-cured state) is provided. A plurality of the insulating wires 3 provided with the adhesive resin layer 4 are collected, and an insulating tape such as polyethylene terephthalate (PET) tape or kraft paper tape is wound around the surface of the insulating wire 3 to form a collective coating layer 5. It was done.

In such a transposed electric wire, when the insulating wires 3 are assembled, each of the insulating wires 3 is
The positions are sequentially changed and displaced. The dislocation electric wire formed by twisting the individual insulated wires in this way has less stray loss in the winding wire, has a higher space factor than general paper winding wires, and can simplify the coil winding work. It has advantages.

Further, in the above-mentioned dislocation electric wire, the adhesive resin layer is melted by simply heating and the insulating wires 3 are adhered to each other, and the insulating wires 3 are integrated. There is a feature that can be easily done. Such an adhesive resin layer is mainly composed of a flexible phenoxy resin or an epoxy resin which is superior in heat resistance and adhesiveness to a phenoxy resin, and such an adhesive resin includes butylated melamine resin and methylated melamine resin. An alkyl etherified melamine resin, a stabilized isocyanate, an adhesive resin composition prepared by blending an acid anhydride and the like, and a solvent such as naphtha and xylene that dissolves the adhesive resin composition. The adhesive resin composition is dissolved to form a varnish.

By the way, when the adhesive resin layer is coated, it is possible to obtain appropriate adhesiveness and flexibility by adjusting the baking linear velocity and the baking temperature. The allowable range of the linear baking speed and the baking temperature for obtaining flexibility is extremely narrow in order to control this adhesive resin in an unstable B-stage state. In such a B-stage control resin, increasing the degree of resin cross-linking improves the strength of the resin film formed and the adhesion to the insulating coating layer, while reducing the area where the resin can cross-link during adhesion. As a result, the adhesiveness between the resin films decreases. As described above, in the B-stage control resin, the adhesiveness and the flexibility are in a contradictory relationship, and it is difficult to expand the appropriate baking conditions for both of them.

In order to expand the baking conditions under the above circumstances, it is necessary to construct an adhesive resin composition whose flexibility reaches a standard while the degree of resin crosslinking is kept low. Therefore, a B-stage control resin is generally relatively inferior in flexibility.
For this reason, the conventional insulating wire provided with the adhesive resin layer is inferior in flexibility and sometimes cracks are generated at the time of dislocation.

On the other hand, regarding the adhesiveness, it is impossible to stably obtain good adhesiveness because it is difficult to control the baking conditions, and it is generally difficult to obtain stable quality. .

[0008]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to obtain an adhesive transition wire and cable which are excellent in flexibility, have stable adhesiveness, and are easy to design and manufacture.

[0009]

This problem is solved by applying a powder adhesive resin to form an adhesive resin layer instead of the adhesive resin coating on the B-stage.

The present invention will be described in detail below with reference to FIG. The adhesive type transition electric wire and cable of the present invention are different from the conventional products in that the adhesive resin layer shown by reference numeral 4 in FIG.
It is formed by applying and adhering a powder adhesive resin. As such a powder adhesive resin, a phenoxy resin, an epoxy resin, an isocyanate resin, or the like can be used, and it is desirable to use such a resin as a particle diameter that passes 100 mesh.

In order to form the adhesive resin layer 4 using the powder adhesive resin as described above, for example, a method using an apparatus as shown in FIG. 2 is suitable. 2 is a twisting machine, and the twisting machine 6 twists the insulating wires 3 ... To form a single wire. Insulating wires 3 ... Which are about to be integrated into a wire shape are introduced into the powder coating box 7 that is provided integrally with the twisting machine 6. The powder coating box 7 is for attaching a powder adhesive resin to the insulating strands 3 ... Which are being twisted in the twisting machine 6 by means such as spraying.

A tape winding machine 8 is installed after the twisting machine 6 and the powder coating box 7. In the tape winding machine 8, a PET tape or a wire to which the powder adhesive resin is adhered is attached. By winding a kraft paper tape or the like, a collective coating layer is formed to form an adhesive type transition wire. The adhesive dislocation electric wire thus produced is subsequently introduced into the winding machine 9. The winding machine 9 winds up and stores the above-mentioned adhesive type transition wire.

In addition to the above, as a method of applying the powder adhesive resin, a method of adsorbing the powder adhesive resin by using static electricity or a lubricant such as liquid paraffin is applied to the insulating wire in advance, A method of sticking the powder adhesive resin using a lubricant can be used. Further, in order to obtain more desirable quality, it is preferable that the powder is applied again immediately before the collective coating layer is applied by any method.

Since the adhesive type transition electric wire and cable of the present invention have an adhesive resin layer formed by applying a powder adhesive resin in place of the conventional adhesive resin layer in the B-stage state, it is a great leap compared with the conventional product. It has improved adhesiveness and stable adhesiveness. Further, in the conventional product, since the adhesive resin layer in the B-stage state is provided by baking, it is necessary to control the strict manufacturing conditions, whereas the adhesive transition wire and cable of the present invention are easy to manufacture. It is obtained with stable quality.

Further, in the method of manufacturing the adhesive dislocation electric wire of the present invention, the adhesive resin is applied in the form of powder to form an adhesive layer and does not change the state of the adhesive resin. It is possible to use an adhesive resin having a high melting point or an inflexible adhesive resin which cannot be used conventionally, and the characteristics such as heat resistance and adhesiveness of the adhesive resin can be directly utilized in the adhesive resin layer. Therefore, by selecting and using an adhesive resin according to characteristics such as heat resistance and adhesiveness, it is possible to impart desirable characteristics to the adhesive transition wire, the adhesive resin layer of the cable, that is, an adhesive transition wire having desirable characteristics, Easy cable design.

Hereinafter, the working effects of the present invention will be clarified by showing concrete examples. Using a conventional adhesive-type transition wire including a B-stage control adhesive resin coating, the quality of the adhesive-type transition wire of the present invention using a powder adhesive resin was examined. (Example 1) As the conductor, a rectangular copper wire having a rectangular section of 2.1 mm x 5.7 mm was used, and an insulating coating layer made of polyvinyl formal (PVF) was provided around the conductor to form an insulating element wire. An epoxy resin powder having a particle size of 100 mesh pass was electrostatically adsorbed on the insulating wire to form an adhesive resin layer. In this way, 11 pieces of insulating wires that have adsorbed the adhesive resin are twisted together, and the powder of the epoxy resin is adsorbed again by static electricity, and a collective coating layer is formed by winding polyethylene terephthalate (PET) tape to form an adhesive type. The dislocation electric wire was obtained.

(Example 2) An adhesive dislocation electric wire was prepared in the same manner as in Example 1 except that a lubricant of liquid paraffin was applied onto the insulating wire and the above-mentioned epoxy resin powder was adhered by the lubricant. Got (Example 3) Except that a lubricant of liquid paraffin was applied onto the insulating wire, the powder of the epoxy resin was adhered by the lubricant, and a collective insulation coating was applied by winding a kraft paper tape. An adhesive dislocation electric wire was obtained in the same manner as in Example 1.

(Comparative Example 1) An adhesive dislocation electric wire was prepared in the same manner as in Example 1 except that the insulating resin wire was coated with a phenoxy resin and the adhesive resin layer was formed in the B-stage state. Got (Comparative Example 2) An adhesive dislocation electric wire was obtained in the same manner as in Example 1 except that an insulating resin was covered with an epoxy resin and the adhesive resin layer was formed by setting it in the B-stage state. .

Ten samples were prepared for each of Examples 1 to 3 and Comparative Examples 1 and 2 and tested for adhesiveness and flexibility. The adhesive stability and flexibility stability of each example are shown below. The evaluation was performed according to the criteria of ○, △, ×. ○: Quality characteristics are stable across samples △: Quality characteristics vary from sample to sample and difficult to manage ×: No quality characteristics required for each sample

[0020]

[Table 1]

From the results shown in Table 1, in the case where the phenoxy resin of Comparative Example 1 was used to provide the adhesive resin layer in the B-stage state, the adhesiveness and flexibility of each sample varied. In addition, the quality control is difficult, and the epoxy resin of Comparative Example 2 provided with the adhesive resin layer in the B-stage state has no flexibility under the baking conditions capable of obtaining adhesiveness. It was found that the desired characteristics were not obtained for any of the specimens, as the adhesiveness was not obtained at all under the baking conditions in which flexibility was obtained.

On the other hand, in the case of using the powder adhesive resin of Examples 1 to 3, Example 1 using static electricity as a means for applying the powder adhesive resin and Example using liquid paraffin as a lubricant It can be seen that stable quality was obtained in both cases.

[0023]

As described above, the adhesive-type transition wire and cable of the present invention have flexibility as compared with the conventional product because the adhesive resin powder is applied to form the adhesive resin layer. It has dramatically improved and has stable adhesiveness.
Moreover, since the adhesive-type transposed electric wire and cable of the present invention do not have an adhesive resin layer in a B-stage state, strict management of manufacturing conditions is not required, and the manufacturing is easy and can be obtained with stable quality. Is.

Further, since the adhesive type transition electric wire and cable of the present invention are formed by applying the adhesive resin powder to form the adhesive resin layer, they have a high melting point which cannot be used by the conventional baking method. An adhesive resin or a non-flexible adhesive resin can be preferably used, and the adhesive resin to be used can be selected according to the required characteristics, so that the manufacturing design is easy.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a bonded transition wire and cable of the present invention.

FIG. 2 is a side view showing an example of a bonding dislocation electric wire and cable manufacturing apparatus according to the present invention.

[Explanation of symbols]

1 ... Conductor, 2 ... Insulating coating layer, 3 ... Insulating wire, 4 ... Adhesive resin layer, 5 ... Collective coating layer.

Claims (2)

[Claims] 1. An adhesive resin layer is provided on an insulating element wire having an insulating coating layer on a conductor, and a plurality of insulating element wires provided with the adhesive resin layer are twisted together to collectively cover the surrounding area. An adhesive type transition electric wire and a cable in which a powder adhesive resin is applied as the adhesive resin layer in an adhesive type transition electric wire having a layer formed thereon. 2. The adhesive dislocation electric wire and cable according to claim 1, wherein the conductor is a rectangular wire.