JPH024963B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a method of manufacturing an insulated wire in which an insulating layer is formed using a synthetic resin tape.

The method of obtaining an insulated wire by winding a synthetic resin tape vertically on a conductor is different from the method of winding such tape in a spiral shape on a conductor, as compared to the method in which (i) both the conductor and the tape move linearly; Because it is done,
Compared to spirally winding tape around a conductor, it is easier to improve work efficiency, and the rate of defective products due to tape breakage or unwrapping is low.

(ii) High operational safety with fewer dangerous movements.

(iii) The finished diameter is relatively small, and the voltage resistance per unit thickness of the insulating layer is improved.

There are advantages such as, and attempts have been made to apply it to many types of electric wires.

However, on the other hand, in this method of forming an insulating layer by applying tape vertically on a conductor, (A) Generally, a solvent or adhesive is interposed in the lap part of the tape applied vertically, and this area is pressed with a heated iron. However, as a result of the pressure heating being concentrated locally, for example, the tape may not adapt properly to slight distortions in the conductor, resulting in uneven areas in the pressure heating and resulting in poor product quality. This may cause variation.

(B) Particularly during pressurization and heating with the above-mentioned iron, tape scum and adhesive hardening scum that are generated due to friction and adhere to the iron surface are transferred to the surface of the insulated wire, which not only impairs the appearance and quality of the product, but also causes damage to the tape. This method inevitably has drawbacks such as unnecessarily disturbing the lapped portion and causing poor adhesion.

The inventors have made extensive studies to overcome these drawbacks, and as a result they have arrived at the present invention. Namely, the present invention consists of overlapping synthetic resin insulating tapes on a conductor with their longitudinal edges mutually overlapping each other. The conductor is unrolled vertically, and is placed on a rotating wheel that rotates at a circumferential speed approximately equal to the unwinding speed, over a circular arc of a desired length such that the insulating tape layer is located approximately at the outermost periphery. This is a method of manufacturing an insulated wire, characterized in that the tape multilayer portion is thermally bonded by contact guidance and heating means provided along the outside of the rotating wheel.

An embodiment of the present invention will be described below based on the accompanying drawings.

The conductor 1 is fed as shown in the figure, the insulating tape 2 is applied from the lower side, and the insulating tape 2 is passed through the vertical support head 3 in the usual way. It is wound in a configuration in which the directional edges are mutually overlaid 2'.

A rotary wheel 4 is disposed at the rear end of the vertical support head 3 at a position substantially tangential to the vertical support head 3, and the rotary wheel 4 has a circumferential speed equal to the wire passing speed. The conductor 1' on which the insulating tape 2 is vertically attached is wound and taken up so that the tape layered part 2' is the outermost side, and is sent to a winding machine (not shown). It's getting old.

For example, infrared heating devices 5, 5' are provided concentrically and over a desired length close to the outside of the tape conductor 1' wound around the rotary ring 4, and the insulating tape layered portion 2' is heated. It is becoming more and more like this.

When the conductor 1' on which the insulating tape 2 is vertically attached is wound around the rotating ring 4 and taken off as described above, the conductor 1' is essentially bent along the outer circumference of the rotating ring 4. As described above, since the layered portion 2' of the insulating tape 2 is located at the outermost side, a tensile force is applied to this portion in the circumferential direction, and as a result, the insulating tape 2 in the layered portion 2' is strongly pushed onto the conductor 1. It receives a pressing force and is simultaneously heated from the outside by heating devices 5, 5'.

Now, so that the pressing force of the insulating tape 2 in the direction of the conductor 1 at the multilayer part 2' is maintained appropriately,
By determining the diameter of the rotating wheel 4 as desired, and further setting the temperature and time so that the tapes of the multilayer portion 2' are bonded together by the heating devices 5 and 5', the above-mentioned vertical The attachment tapes 2 are bonded to each other without any contact with other jigs such as the above-mentioned heating iron.

This adhesion is carried out under tension between the stacked tape parts and under pressure in the direction of the conductor, and as a result, the tapes are bonded well and in contact with each other, so that the adhesion is carried out extremely uniformly.

The taking-up of the conductor 1 by the rotating wheel 4 can be determined as appropriate depending on the conductor taking-up speed, the material of the insulating tape 2, the heating temperature, etc., such as whether it is carried out on one circular arc on the outer periphery or whether the conductor is wound several times. be.

As described above, the present invention unwinds a synthetic resin insulating tape onto a conductor while stacking its longitudinal edges vertically, and rotates the conductor with a circumferential speed substantially matching the unwinding speed. The insulating tape layered portion is guided in contact with a circular arc of a desired length so that it is positioned approximately at the outermost periphery on a rotating wheel, and the tape is heated by a heating means provided along the outside of the rotating wheel. The layered parts are glued together.

Therefore, the drawbacks such as deterioration in appearance due to contact with an iron, etc. during heating are eliminated, and in addition, non-uniform adhesion occurs because the overlapping parts of the insulating tape are under tension and subjected to pressing force in the direction of the conductor during heat bonding. This has the effect of substantially wiping out the above-mentioned problems, such as a drastic reduction in

The present invention will be specifically explained below using examples.

Example An insulated wire was obtained by the method of the illustrated embodiment under the following conditions.

Conductor: 1.8 x 6.5 rectangular copper wire Insulating tape: 1-Mex 410, 5MIL (DuPont) Intervening adhesive: Epoxy adhesive Heating source: Far infrared heater (Ziyad) Line speed: 20.0 m/min Rotating wheel: 700 mmφ , number of take-up windings (1 time) The strength of the tape joint of the obtained insulated wire was examined and found to be 5.0 kg/cm on average. Furthermore, compared to the electric wire obtained by a conventional method, ie, the ironing method, which was used for comparison, the average weight was 2.8 kg/cm, this was significantly superior, and the appearance was also improved.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of essential parts for explaining one embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line of the same figure. DESCRIPTION OF SYMBOLS 1... Conductor, 2... Insulating tape, 2'... Layered part, 4... Rotating wheel, 5, 5'... Heating device.

Claims (1)

[Claims] 1. A synthetic resin insulating tape is fed out onto a conductor with its longitudinal edges layered vertically, and this conductor is placed on a rotating wheel that rotates at a circumferential speed that substantially matches the feeding speed. The insulating tape layered portion is guided in contact with a circular arc of a desired length so that it is located approximately at the outermost periphery, and the tape layered portion is thermally bonded by heating means provided along the outside of the rotating wheel. Method of manufacturing insulated wire.