JPS6050817A - Method of producing insulated wire by electrostatic powder coating method - 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 [Technical Field of the Invention] The present invention relates to a method for manufacturing an insulated wire by electrostatic powder coating.

[Technical background of the invention and its problems] In recent years, insulated wires using powder coating method have been developed. The i-coating method has been attracting attention from the viewpoint of pollution-free, resource-saving, and energy-saving.
As an alternative method, the electrostatic dynamic dipping method is attracting attention particularly in the field of insulated wire manufacturing.

In this method, for example, charged synthetic resin powder is fluidized by dry air passing through a perforated plate placed below. A fluidized bed was formed, and the metal conductor was filled with the synthetic resin powder on the upper part of the fluidized bed. This is a method in which a synthetic resin powder is heat-fused and cured to form a coating, and a metal conductor is usually sized horizontally within a heating zone.

However, while this method has the advantage that the length of the coating zone can be easily increased as required and that variations in film thickness are small, synthetic resin powder is applied to the bottom surface of the metal conductor compared to the top and side surfaces. There was a problem in that the body easily adhered to the coating and a coating of uniform thickness could not be obtained all around the circumference.

[Purpose of the Invention] The present invention was made to solve such problems, and provides a method for manufacturing an insulated wire with a coating having a uniform thickness over the entire circumference and having high electrical properties, particularly dielectric breakdown voltage. The purpose is to provide

[Summary of the Invention] That is, in the method of manufacturing an insulated wire using the electrostatic powder coating method of the present invention, a conductor is passed horizontally through a coating zone filled with charged synthetic resin powder, and the above-mentioned coating is applied to the surface of the conductor. A method for manufacturing an insulated wire in which a synthetic resin powder is attached and then the attached synthetic resin powder is heated and fused onto a conductor to form an insulating film, in which a predetermined distance is provided on the downward and both sides of the conductor. A long adhesion amount adjusting plate is disposed in parallel with the conductor to adjust the amount of the synthetic resin powder adhering to the lower and side surfaces of the conductor.

Among the adhesion amount adjustment plates in the present invention, the adhesion amount adjustment plate disposed below the conductor allows the synthetic resin powder rising from the fluidized bed to continue to rise and adhere to the lower surface of the metal conductor in large quantities.
It is provided to prevent this from occurring, and it is desirable to use a flat plate.

In addition, the adhesion amount adjustment plates placed on both sides of the conductor change the course of the synthetic resin powder rising from the side of the conductor horizontally or diagonally downward, and direct it toward the top and side surfaces of the conductor. It is desirable to have a shallow V-shaped conductor with both sides inclined inward so that they approach each other at the top, and then face each other with the conductor sandwiched between them so as to cover the conductor at the top. .

Furthermore, as these adhesion amount adjustment plates, those made of synthetic resin are suitable, and the installation position of the adhesion port adjustment plates, that is, the distance of these attachment amount adjustment plates from the metal conductor, is as follows:
It is desirable to make appropriate adjustments to form a coating with as uniform a thickness as possible depending on the size of the metal conductor, the thickness and density of the synthetic resin powder, etc.

[Embodiment 1 of the invention 3- Examples of the present invention will be described below.

Example As shown in the drawings, a Scotchcast (trade name of an epoxy resin object manufactured by 3M Corporation in the United States) 1 charged with a charging voltage of -65 to -80 kV is placed on a perforated plate 3 in a coating chamber 2 having a length of 70 CIIl. was fluidized by dry air passing through at a flow rate of 300 J2/min to form a fluidized bed 4 at the bottom of the coating chamber 2. 2. Approximately 10a1 above this fluidized bed 4.
OX5. A flat rectangular copper wire 5 of ON was passed horizontally at a speed of 3.0 m/min to adhere the charged Scotch cast to the surface. At this time, a plastic flat adhesion amount adjustment plate 6 with a width of 5 CIIl is placed horizontally at a position 5 cm below the rectangular copper wire 5, and two adhesion amount adjusting plates 6 with shallow inverted V-shaped cross sections are placed on both sides. Adjustment plates 7 and 7' were arranged parallel to both sides of the rectangular copper wire 5, and painting was performed. Note that the arrows in the figure indicate the flow of scotch cast toward a dust collector (not shown).

3. Next, the rectangular copper wire with Scotch cast adhered to the surface is placed in a heating furnace 5-4- with a furnace temperature of 450°C and a furnace length of 3.5IIl. It was inserted at a speed of (') III/min, and the ScotchCast I was heat-fused and further cured.

The coating thicknesses of the obtained rectangular insulated wires on the top surface and the bottom were measured respectively for wires with different finished thicknesses. The measurement results are shown in the table below as the ratio of coating thickness on the top and bottom surfaces.

The comparative examples shown in the table are the measurement results for rectangular insulated wires manufactured under the same conditions as in the examples except that the adhesion amount adjusting plate was not used.

(Leaving space below) Free - 6 - From the above measurement results, when the coating amount adjustment plate is placed below the rectangular copper wire and parallel to it on both sides, a coating with a more uniform thickness can be obtained compared to the conventional method. It can be seen that it is formed.

[Effects of the Invention] As is clear from the above examples, according to the present invention, an insulating coating having a uniform thickness is formed over the entire circumference of the conductor, and therefore an insulated wire with excellent electrical and mechanical properties can be manufactured. be able to.

[Brief explanation of drawings]

The drawings are cross-sectional views for explaining the coating process in an embodiment of the present invention. 2・・・・・・・・・・・・Painting room 3・・・・・・・・・・・・Perforated plate 4・・・・・・・・・・・・Flow #J layer 5...・・・・・・・・・Flat copper wire 6.7.7′...fj quantity adjustment plate attorney Jusu Yama Butsu - (1 idiot)

Claims (1)

[Claims] (1) A conductor is passed horizontally through a coating zone filled with charged synthetic resin powder to adhere the synthetic resin powder to its surface, and then the adhered synthetic resin powder is heated onto the conductor. In a method of manufacturing an insulated wire in which an insulating film is formed by fusing the conductor, a long adhesion amount adjusting plate is arranged in parallel with the conductor at a predetermined interval below and on both sides of the conductor, and A method for manufacturing an insulated wire using an electrostatic powder coating method, the method comprising adjusting the amount of the synthetic resin powder deposited on the lower surface and side surfaces.