JPS5810813A - Condenser - 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 dielectric material and a protective material for a plastic film capacitor or an insulating paper capacitor (hereinafter collectively referred to as a film capacitor), and its purpose is to protect the dielectric materials between one dielectric material or the protective material. It improves the adhesion between each other and the adhesion between the dielectric and the electrodes, prevents short circuits of the capacitor, deterioration of the dielectric loss tangent, and decreases in insulation resistance, resulting in less variation in capacitance, higher performance, and easier workability than before. The aim is to ensure that there is no decline compared to the

For on-fill capacitors that use plastic film, metallized plastic film, insulating paper, or metallized insulating paper (hereinafter collectively referred to as film), the wound or laminated elements are molded by heat and pressure. However, in capacitors using conventional films, even after molding, the adhesion between the dielectrics or between the protective films, and between the dielectrics and the electrodes was incomplete.

When close contact is incomplete, the following types of regular customers are seen.

(1) In the metallicon process using metal spraying, metallicon particles enter the film gap and short-circuit the capacitor. (2) In the metallicon process, the device is masked to prevent metallicon particles from flowing along the sides of the element, but Later, when this masking is removed, peeling of the protective film occurs, which poses problems in terms of workability and appearance in the subsequent process.

The present invention solves the above-mentioned conventional problems, and uses glue (which is non-adhesive at room temperature and adhesive at temperatures above 60°C) to be used as a dielectric film or protective film on the surface.
For example, a film coated with a modified ether type polyester resin (modified ether type polyester resin) is used, and the heat during thermoforming brings the films into close contact with each other or the film and the electrode. However, if a glue that is sticky even at room temperature is used, workability and yield will be significantly reduced in the film winding process and other processes prior to thermoforming.

The setting of the lowest temperature at which the glue becomes sticky is determined by the workability of the process before thermoforming (vertical axis) as shown in Figure 1, compared to the case where conventional film is used. ) was set to 60°C, so this value was chosen. Note that (a) shows the line of 100% workability when using conventional film.

FIG. 2 shows an embodiment of the present invention, in which the material for the outer periphery protective film <2) for the element (1) of a wound capacitor is
It is a figure when using the film whose surface was coated with the glue (3) of the present invention which is non-adhesive at room temperature and adhesive at 60°C. Figure 3 is a diagram showing the state of film peeling after removing the masking in the metallcon process.
1) indicates an element, and (31 indicates a glue that is non-adhesive at room temperature and tacky at 6000).

As described above, if the film of the present invention coated with the adhesive that is non-tacky at room temperature and sticky at temperatures above 60°C is used as a protective film, peeling of the film will be greatly reduced, and workability in post-processing will be improved. This has greatly contributed to the appearance yield. In other words, the incidence of protective film peeling is 5.8% when using conventional film.
On the other hand, when a film whose surface was coated with the glue of the present invention was used, it was reduced to 0.02%. or,
If this adhesive, which is non-adhesive at room temperature and sticky at temperatures above 60°C, is used by coating the protective film at the beginning of winding and the dielectric film, short-circuiting of the capacitor and dielectric loss tangent due to metallicon particles entering the gaps between the films can be avoided. (TANJ
) Deterioration can be prevented. In FIG. 4(a), (a) shows the product of the present invention and (b) shows the conventional product. It is also possible to prevent the insulation resistance (IR) from decreasing due to the intrusion of the exterior resin. Figure 4(b)
Here, (a) shows the product of the present invention, and main part) shows the conventional product. Uniform molding with few air gaps is possible, resulting in less variation in capacitance and higher corona onset voltage (see Figure 4 (0)) and short-time breakdown voltage (see Figure 4 (d)). We were able to provide capacitors.

[Brief explanation of the drawing]

Figure 1 shows the relationship between the temperature at which glue becomes sticky and workability in processes before the thermoforming process, and Figure 2 shows the relationship between the temperature at which glue becomes sticky and workability in processes before the thermoforming process. A perspective view showing the state in which a film coated with adhesive on the surface is used as a protective film for a wound type capacitor. The perspective view shown in Fig. 4 shows the primary characteristics of the capacitor of the present invention (A) and the conventional product (A).
(a) is the dielectric loss tangent (TAX).
0(1)... Element, (2)... Protective film, (3)... Room temperature non-adhesive adhesive protective film No. 4 (b) (C) (d)

Claims (1)

[Claims] (1) For the purpose of adhesion between dielectric materials or protective materials and adhesion between dielectric materials and electrodes in a capacitor, the surface is coated with glue that is non-adhesive at room temperature and adhesive at 60°C or higher. A capacitor characterized by using a plastic film, a metalized plastic film, an insulating paper, or a metalized insulating paper.