JPS6220997Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Technical breakdown of the invention] This invention relates to a device for chemically converting aluminum foil for electrolytic capacitors. [Technical background of the invention and its problems] Conventionally, the equipment used to generate a chemical conversion film on etched aluminum foil is a device that generates a chemical conversion film on aluminum foil running in contact with a contact roller connected to the anode of a power source. Chemical formation was carried out between the formation electrodes arranged in the tank and connected to the cathode of the power source.
However, when power is supplied to aluminum foil through such a contact roller, sparks may occur due to poor contact due to contamination of the contact roller and aluminum foil, and the contact roller must be polished frequently due to this contamination or sparks. In addition, the contact area between the contact roller and the aluminum foil is small, so a large current cannot be passed. In order to improve the power supply method using such a contact roller, a method may be considered in which a power supply tank having a power supply electrode arranged therein is provided and power is supplied from the power supply electrode to the aluminum foil via the power supply liquid. That is, since the anode from the DC power supply is connected to the power supply electrode installed in the power supply tank, the supplied current is supplied from the power supply electrode to the aluminum foil via the power supply liquid. Therefore, it has the advantage of allowing a large current to flow without causing sparks or the like. However, since the aluminum foil runs opposite the power supply electrode, the current concentrates at both ends of the aluminum foil, and the aluminum foil absorbs the hydrogen gas generated by this concentration of current and becomes brittle. There was a problem that the material was distorted or the edges were torn. [Purpose of the invention] The purpose of this device for forming aluminum foil for electrolytic capacitors is to prevent distortion and tearing of both ends of the aluminum foil in a forming method that uses a power supply tank to supply power. [Summary of the invention] This device for chemical conversion of aluminum foil for electrolytic capacitors is a chemical conversion device for aluminum foil for electrolytic capacitors in which power is supplied to the aluminum foil in a power supply tank equipped with a power supply electrode. An electrically insulating shield plate must be placed between the power supply electrode and the aluminum foil so as to shield 10 to 50 mm from both ends of the aluminum foil, and the distance between the shield plate and the power supply electrode must be within the range of 5 to 50 mm. It is characterized by [Example of the invention] Fig. 1 is a plan view excluding the guide roller, Fig. 2 is a plan view with the guide roller removed;
As shown in the cross-sectional view in the figure, power supply electrodes 2, 3, and 4 are arranged in the power supply tank 1, and are connected to the anode of a power source 5. A shielding plate 6 is arranged at both ends of the power supply electrodes 2, 3, 4, and the shielding plate 6 is connected to the power supply.

[Table] The conventional example was chemically formed under the same conditions as the present invention except that no shielding plate was used. In addition, the number of bends was determined by cutting aluminum foil into a width of 10 mm, hanging a 250 g weight on it, bending it 45 degrees from the center, returning it to the center, and bending it 45 degrees on the other side.
This is the number of times the sheet is bent, with one time being the time when the sheet is returned to the bending center. As mentioned above, if the aluminum foil chemical conversion equipment for electrolytic capacitors of the present invention is used, the concentration of current from the power supply electrodes to both ends of the running aluminum foil will be alleviated, resulting in less hydrogen gas being generated. Both ends of the aluminum foil no longer absorb hydrogen gas, and the brittleness is eliminated, so there is no possibility of distortion or tearing. Incidentally, the dimension A in which the shielding plate 6 shields both ends of the aluminum foil is closely related to the distance B between the power supply electrodes 2, 3, 4 and the shielding plate 6, and this relationship is shown in FIG. If each dimension is determined within this relationship, concentration of current can be avoided and it will be averaged.
As is clear from this result, if the shielding dimension is less than 10 mm, current will be concentrated at the edge, and if it exceeds 50 mm, the amount of current will be insufficient.
50mm is appropriate. [Effect of the invention] By using this device for chemical conversion of aluminum foil for electrolytic capacitors, it is possible to prevent the aluminum foil from absorbing hydrogen gas by alleviating the concentration of current at both ends of the aluminum foil. It is possible to obtain the effect of preventing warping and brittleness and eliminating distortion, tearing, etc.

[Brief explanation of the drawing]

The drawings all show embodiments of the present invention. Figure 1 is a plan view of the power supply tank, Figure 2 is a sectional view of the power supply tank, and Figure 3 is the dimensions of shielding the aluminum foil and the distance between the power supply electrode and the shield plate. It is a curve diagram showing the relationship with dimensions. 1...Power supply tank, 2, 3, 4...Power supply electrode, 5...
...power supply, 6...shielding plate, 7...aluminum foil, 8...
Guide roller, 9...power supply liquid, 10...submerged roller.

Claims (1)

[Scope of utility model registration request] In chemical conversion equipment for aluminum foil for electrolytic capacitors, which supplies power to aluminum foil using a power supply tank with a power supply electrode,
An electrically insulating shield plate is arranged between the power supply electrode and the aluminum foil so as to shield 10 to 50 mm of both ends of the aluminum foil running opposite to the power supply electrode, and the distance between the shield plate and the power supply electrode is 5 mm. A chemical conversion device for aluminum foil for electrolytic capacitors, which is characterized by a thickness within the range of ~50mm.