JPS5922316A - Electrolytic 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 an electrolytic capacitor in which an anode foil made of aluminum foil and a negative II foil are wound around an electrolytic paper, and the outer periphery of the capacitor element is fixed with an adhesive tape. .

Conventionally, as an electrolytic capacitor, the outer periphery of a capacitor element is fixed by wrapping an anode foil made of aluminum foil and an anode foil made of aluminum foil with an electrolytic paper interposed therebetween. (13) The terminal end of the electrolytic paper wound around the Ndenza element is further extended, and the outermost part of the electrolytic paper is pasted with glue (glue). In the case of (Δ), since the base material of the tape on which the adhesive is laminated is a synthetic resin material such as polypropylene or polycoastyl, the i6 property of the electrolyte by the Arp itself is 10 or nothing.On the other hand, (B) has good electrolyte retention because the outermost periphery is electrolytic paper, but after being subjected to high temperature load test (J3) (the glue (glue) for qri decomposes or the electrolyte It dissolves, and cannot maintain its function as a fixing agent.For example, polyvinyl alcohol-based glue and vinyl acetate-based glue dissolve in the polyhydric alcohol in the electrolyte.

However, the present invention provides an electrolytic condenser in which the outer periphery of a capacitor element is wound with a paper adhesive tape that has sufficient adhesion even in high-temperature load tests and has the ability to retain electrolyte. .

In the present invention, as shown in FIG. 1(a), a paper adhesive tape 1 is made of kraft paper 3 with an adhesive 2 laminated on one side in advance. As the density of paper, 0.3
If it is less than 0.9 g/cmJ, the strength for heavy-duty use of a 21 indium element will be insufficient, and if it exceeds 0.9 g/cmJ, the retention of the electrolyte will be extremely reduced. If the paper thickness is less than 15 μm, it cannot be functionally used as a capacitor element fixing material, and if it exceeds 150 μm, the diameter after winding becomes unnecessarily large, impairing its function as a condenser element fixing material. . The adhesive may be the same synthetic rubber-based, natural rubber-based, or synthetic resin-based adhesive used in conventional synthetic resin adhesives, and the adhesive layer thickness is 10 to 30 mm.
μm is preferred. The kraft paper 3 may be a single-layer paper as shown in FIG. 1(a), or may be coated with other kraft paper, Manila hemp paper, synthetic fiber paper, or other kraft paper, as shown in FIG. 1(b). Mixed paper consisting of two members (3)
It may be a double-layered paper in which a is laminated, or it may be a multi-layered paper with more layers than that. In the case of multi-ply paper including double-ply paper, sheets of different density or thickness may be laminated.

Next, Table 1 lists adhesive tapes made of synthetic resin as conventional example 1.2 and adhesive tapes made of paper as examples 1.2.3.4 of the present invention. A capacitor element having a diameter of 4 mm and a length of 0.5 mm, in which an anode foil and a cathode foil made of aluminum foil were wound with electrolytic paper interposed therebetween, was further expanded to have a width of 6 mm.

An electrolytic capacitor with a stiffness rating of 16 V and 10 μm was prepared by wrapping an adhesive tape r′ with a length of 18 nLm about one and a half turns, and the initial value when the rated voltage was applied and the high temperature load test <85°C, Table 2 shows a comparison with the 6 values after 2000 hours).

In Table 1, the kraft paper of Examples 1, 2, and 3 is a single paper, and the papers of Example 4 are the same (a double woven version of melon).

As can be seen from Tables 1 and 2, in the present invention, compared to the conventional example, the adhesive tape itself has the ability to retain the electrolyte, and it also has excellent resistance to high-temperature load tests. In other words, the capacitance change rate (%) and the tangent of the loss angle (tan δ) can be improved. In FIG. 2, [C] is a leakage current.

[Brief explanation of the drawing]

FIG. 1 (a>, (!1)) is a partial sectional view showing a paper adhesive tape according to the present invention. In the figure, 1... paper adhesive tape, 2...・・・
・Adhesive, 3...Clanod paper. 'l': J'i'r Applicant: ELNA Co., Ltd. No. 1
Figure 65

Claims (5)

[Claims] (1) An electrolytic condenser is made by wrapping the outer periphery of a Contin+1 element in which an anode foil made of aluminum foil and a cathode foil are wound with electrolytic paper interposed therebetween, using a paper adhesive tape made of kraft paper. (2)! The electrolytic capacitor according to claim (1) is formed of a single layer of kraft paper. (3) Jj in claim (1), clan 1-
An electrolytic capacitor formed by laminating other kraft paper, Manila hemp paper, synthetic fiber paper, or a mixed paper consisting of at least 20 of these on paper to form a multilayer structure. (4) An electrolytic capacitor according to claim (1), (2) or (3), characterized in that the paper has a density of 0.3 to 0.9 g/am. (5) Scope of claims (1), (2) or (3)
In paper jJ! An electrolytic capacitor characterized in that it has a diameter of 15 to 150 μm. 6) Claim (3) (1) A multi-layer structure in which other kraft paper, Manila hemp paper, synthetic fiber paper, or a mixed paper consisting of at least two members thereof is laminated on kraft paper with different densities. An electrolytic capacitor formed by forming 'U'. Electrolytic capacitors are made by laminating paper into a multilayer structure.