JP2006196740A - Method and device for manufacturing of electrode foil for electrolytic capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that spark is generated due to increase of a contact resistance between a feed roller and an electrode foil as an operation time increases when the electrode foil for an electrolytic capacitor is manufactured, thus deteriorating quality and operativity, to provide a manufacturing device of the electrode foil for an electrolytic capacitor which is excellent in quality and a cost, and to provide a manufacturing method using it. <P>SOLUTION: In the manufacturing method of an electrode foil for an electrolytic capacitor for etching an electrode foil 1 by applying a DC current between a feed roller 4 and a pair of cathode plates 7, spark generated in the roller 4 is detected by a metallic roller 9 for spark detection by disposing the metallic roller 9 for spark detection in an upstream side of the roller 4, and a judgement part is provided for carrying out comparison judgement 10 to a preset spark waveform. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an apparatus for producing an electrode foil for an electrolytic capacitor used when producing an electrode foil of an electrolytic capacitor used in various electronic devices, and a production method using the same.

  FIG. 4 is a conceptual diagram showing the configuration of a power supply treatment tank in this type of conventional electrolytic capacitor electrode foil manufacturing apparatus. In FIG. 4, 40 is an electrode foil, and 41 is a treatment filled with an etching solution 42. The tanks 43, 44 and 45 are fed into the treatment tank 41 by feeding the electrode foil 40 into the treatment tank 41 and continuously running in the treatment tank 41. The tank and outlet rollers 46 are fed into the treatment tank 41. A cathode plate 47 is disposed so as to be opposed to the electrode foil 40 so as to pass between them, and 47 is a power source in which the cathode plate 46 is connected to the negative electrode and the power supply roller 43 is connected to the positive electrode. It is.

  The electrolytic capacitor electrode foil manufacturing apparatus provided with the conventional power supply processing tank configured as described above sends the aluminum electrode foil 40 into the processing tank 41 filled with the etching solution 42 and in this state. Etching is performed by continuously running the electrode foil 40 at a predetermined speed while applying a predetermined voltage between the electrode foil 40 and the cathode plate 46 via the power source 47.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2002-8949 A

  However, in the electrolytic capacitor electrode foil manufacturing apparatus having the conventional power supply processing tank, the main part of the power supply processing tank 41 is deteriorated due to aging as the working time increases. As the foil 40 is fed into the treatment tank 41 and a positive voltage is applied to the electrode foil 40, deterioration due to the change with time is likely to appear on the outer peripheral surface, and the contact resistance between the power supply roller 43 and the electrode foil 40 is reduced. When the contact resistance exceeds a certain value, it increases with an increase in working time, and an electric spark is generated and the electrode foil 40 is damaged. Maintenance such as cleaning of the outer peripheral surface of 43 is required, and as a result, there is a problem that the operating rate and productivity of the apparatus are lowered.

  In addition, there is a possibility that a damaged portion due to sparks is partially generated in the electrode foil 40 for an electrolytic capacitor manufactured by the apparatus for manufacturing an electrode foil for an electrolytic capacitor having such a conventional power supply processing tank. Therefore, it is unstable in terms of quality, and requires inspection and removal work for removing the damaged portion, which has a big problem that it leads to cost increase as a result.

  The present invention solves such a conventional problem and prevents the occurrence of sparks in the manufacturing process of the electrode foil, whereby an electrode foil excellent in quality and cost can be stably manufactured. An object of the present invention is to provide an electrode foil manufacturing apparatus and a manufacturing method using the same.

  In order to solve the above-mentioned problems, the present invention particularly provides a spark detection metal roller on the upstream side of the power feed roller in the carry-in portion, and detects sparks generated by the power feed roller with the spark detection metal roller in advance. It is an apparatus for manufacturing an electrode foil for electrolytic capacitors that includes a determination unit that performs a comparison determination with a set spark waveform.

  In addition, the present invention particularly provides a spark detection metal roller upstream of the power supply roller, wets the electrode foil with water and causes the power supply roller to travel, and sparks generated by the power supply roller are detected by the spark detection metal roller. The method of manufacturing an electrode foil for an electrolytic capacitor that is to be detected.

  Thereby, it is possible to prevent the occurrence of sparks in the production of the electrolytic capacitor electrode foil.

  As described above, according to the present invention, the detection metal roller is disposed on the upstream side of the feeding roller in the carry-in portion, and the spark generated by the feeding roller is detected by the detection metal roller and compared with a preset spark waveform. By using the manufacturing apparatus including the determination unit that performs the determination, the spark generated by the power supply roller can be reliably detected by the spark detection metal roller without damaging the electrode foil.

  In addition, by letting the electrode foil wet with water and running the feed roller, the spark waveform can be reliably detected by the spark detection metal roller using the electrical conductivity of water, even for minute sparks generated by the feed roller. it can.

  In addition, since the electrode foil is manufactured using the electrolytic capacitor electrode foil manufacturing apparatus, the spark generated between the power supply roller and the electrode foil can be reliably measured, so that it is compared with a preset spark waveform. If it is larger than the set value, it is possible to stop the travel of the electrode foil, so that it is possible to remove the electrode foil in which the damaged part due to the spark is partially generated, and it is excellent in quality and productivity, and is inexpensive The effect that can be provided is obtained.

  An apparatus for producing an electrode foil for an electrolytic capacitor according to the present invention includes a treatment tank in which at least a pair of cathode plates are arranged and filled with an etching solution, a carry-in portion for feeding the electrode foil into the treatment tank, and the inside of the treatment tank. A power source in which a plurality of traveling rollers provided so that the electrode foil travels and feeds out, a power supply roller provided in the carry-in portion are connected to the positive electrode, and a pair of cathode plates disposed in the processing tank are connected to the negative electrode In the electrolytic capacitor electrode foil manufacturing apparatus for etching the electrode foil comprising at least a power supply processing tank comprising: a spark detection metal roller upstream of the power supply roller of the carry-in portion; It features an apparatus for producing an electrolytic capacitor electrode foil having a determination unit that detects a spark generated by a power supply roller with a metal roller for spark detection and performs a comparison determination with a preset spark waveform. To have. As a result, sparks generated by the power supply roller can be prevented in advance, and the electrode foil is not damaged.

  Moreover, since the spray part which wets an electrode foil with water is provided in the part which drive | works a feed roller, the detection accuracy of a spark can be improved.

  The method for producing an electrode foil for an electrolytic capacitor according to the present invention includes a treatment tank in which at least a pair of cathode plates are arranged and filled with an etching solution, a carry-in portion for feeding the electrode foil into the treatment tank, and the treatment tank. A plurality of traveling rollers provided so that the electrode foil travels inside and feeds out, and a power supply roller provided in the carry-in portion is connected to the positive electrode, and a pair of cathode plates disposed in the processing tank are connected to the negative electrode, respectively. In the method for manufacturing an electrode foil for an electrolytic capacitor in which a DC voltage is applied between the power supply roller having at least a power supply processing tank composed of a power source and a pair of cathode plates to etch the electrode foil, the upstream of the power supply roller A spark detection metal roller is provided on the side, the electrode foil is wetted with water and the feed roller is run, and the spark generated by the feed roller is detected by the spark detection metal roller. It is characterized in the manufacturing method of the electrode foil for capacitor. As a result, the spark generated between the power supply roller and the electrode foil can be reliably measured, so it is compared with a preset spark waveform, and when it is larger than the setting, the phase of the electrode foil can be stopped. Therefore, the electrode foil in which the damaged portion due to the spark is partially generated can be removed in advance.

  In addition, the detected spark is compared with a preset voltage and time, and when the spark exceeds the detected voltage and time, the travel of the electrode foil is stopped. Also in this case, the electrode foil in which the damaged portion due to the spark is partially generated can be removed in advance.

  Examples of the present invention will be described below with reference to examples.

  FIG. 1 is a conceptual diagram showing the configuration of a power supply treatment tank in an electrolytic capacitor electrode foil manufacturing apparatus according to an embodiment of the present invention. In the figure, 1 is an electrode foil, 2 is a treatment tank filled with an etching solution 3, and 4 to 6 are power supply rollers for feeding the electrode foil 1 into the treatment tank 2 for continuous running, rollers in the tank, and outlets. Laura. Reference numeral 7 denotes a cathode plate which is immersed in the etching solution 3 so as to pass through the electrode foil 1 fed into the treatment tank 2 so as to pass between them, and 8 denotes the power supply with the cathode plate 7 as a negative electrode. A power source 9 is connected to each of the positive and negative rollers 4, and 9 is a spark detection metal roller disposed on the upstream side of the power supply roller 4.

  Reference numeral 10 denotes a determination unit. The determination unit 10 detects a spark generated between the power supply roller 4 and the electrode foil 1 with the spark detection metal roller 9 and performs a comparison determination with a predetermined spark waveform set in advance. The result is displayed and the result is displayed, and the contents are recorded in the recording unit 11.

  The operation of the power supply treatment tank in the electrolytic capacitor electrode foil manufacturing apparatus according to the embodiment of the present invention will be described. First, the electrode foil 1 made of aluminum foil is carried from the left side of FIG. It is immersed in the etching solution 3 filled in the processing tank 2 through the detection roller 9 and the power supply roller 4, which is generally called a running roller, and processed through the tank roller 5 disposed in the etching solution 3. It continuously travels to the outside of the tank 2 and is sent to the next step (right direction in FIG. 1) via an exit roller 6 provided outside the processing tank 2.

  Two pairs of cathode plates 7 are provided in the processing tank 2 so as to face each other so that the electrode foil 1 continuously running in the etching solution 3 filled in the processing tank 2 passes between them. The electrode foil 1 is carried between the cathode plates 7 in a state where a predetermined voltage is applied from the power source 8 with the cathode plate 7 as a negative electrode and the power supply roller 4 as a positive electrode, thereby continuously running through the etching solution 3. Thus, the electrode foil 1 is etched.

  Further, the spark detection metal roller 9 detects a spark generated between the power supply roller 4 and the electrode foil 1, and the determination unit 10 compares the result with a preset spark waveform. The result is displayed and the contents are recorded in the recording unit 11. When the spark waveform is larger than a predetermined waveform, the electrode foil 1 is stopped and the power supply roller 4 is removed. The surface is subjected to maintenance such as cleaning, and the contact resistance between the power supply roller 4 and the electrode foil 1 is returned to the original state.

  The purpose of providing the spark detection metal roller 9 will be described in more detail. Since the power supply roller 4 continuously runs the electrode foil 1, fine dirt on the surface of the electrode foil 1 adheres to the outer surface of the power supply roller 4. To do. The contamination on the outer surface of the power supply roller 4 increases as the working time increases, and as a result, the contact resistance between the power supply roller 4 and the electrode foil 1 increases and sparks are generated. Accordingly, a predetermined voltage is continuously applied from the power source 8 to the power supply roller 4, but the contact resistance between the power supply roller 4 and the electrode foil 1 is increased to the electrode foil 1 through the power supply roller 4. Since the applied voltage also fluctuates, this voltage fluctuation can be monitored using the spark detection metal roller 9 provided on the upstream side of the power supply roller 4, and the spark generated by the power supply roller 4 can also be detected. It is comprised as follows.

  Further, a spray portion is provided on the upper portion of the power supply roller 4 to wet the electrode foil 1 by spraying water, and the wet electrode foil 1 travels on the power supply roller 4, thereby generating between the power supply roller 4 and the electrode foil 1. Even with a small spark, the spark waveform can be reliably detected by the spark detection metal roller 9 by utilizing the conductivity of water.

  As a result, the spark generated between the power supply roller 4 and the electrode foil 1 can be prevented in advance, and a capacitor electrode foil excellent in quality and cost can be stably manufactured. It is a great contribution that a great effect can be obtained with a simple structure.

  Next, a manufacturing apparatus and a manufacturing method of a DC etching foil provided with the processing tank for power supply will be described in detail.

  FIG. 2 is a production process diagram of a direct current etching foil in an electrode foil for an electrolytic capacitor. Basically, after pretreatment of the aluminum foil 21, pre-etching for generating pits, and the pits are suitable for the working voltage of the electrolytic capacitor. It consists of post-etching that expands to a diameter and de-Cl treatment.

  A spark detection metal roller 23 is disposed on the upstream side of the power supply roller 22 in the preceding stage etching to detect a spark generated between the power supply roller 22 and the aluminum foil 21 and to change the voltage between the power supply roller 22 and the aluminum foil 21. Also monitor. Further, a spray portion 24 is provided on the upper portion of the power supply roller 22, and water is sprayed to wet the aluminum foil 21, and the wet aluminum foil 21 travels on the power supply roller 22.

  In the pre-etching, pits are formed in the vertical direction from the surface of the aluminum foil 21. In forming the pits here, it is important to uniformly generate a number of tunnel-like pits on the surface of the aluminum foil 21 and to grow the pits uniformly. The etching solution used in this first stage etching is hydrochloric acid. An aqueous hydrochloric acid solution to which at least one of acids consisting of oxalic acid, sulfuric acid and phosphoric acid or salts thereof is added can be used.

  Next, after the pre-etching, washing is performed and post-etching is performed. This post-stage etching is to increase the diameter of the pits by suppressing the surface dissolution of the aluminum foil 21 from the pits formed by the pre-stage etching. An etching solution to which at least one of acid and boric acid is added is preferable. By direct-current etching in this etching solution, surface dissolution due to the influence of impurities and grain boundaries in the aluminum foil 21 can be suppressed, and the diameter of each pit can be enlarged and made uniform. Finally, de-Cl treatment can be performed to obtain a direct current etching foil.

  Here, as shown in FIG. 3, the spark waveform of the determination unit is set to a voltage of 0.4 V and a time of 0.5 ms to manufacture a DC etching foil. When the spark was detected to be larger than the above setting, the traveling of the aluminum foil was stopped.

  In this way, the obtained direct-current etching foil is then subjected to a chemical conversion treatment by applying a predetermined chemical conversion voltage, whereby an electrode foil having a high capacitance can be obtained.

  Moreover, the direct current etching foil in which the damaged part due to the spark is partially generated can be removed in advance, and an inexpensive direct current etching foil having excellent quality and productivity can be obtained.

  In the DC etching foil manufacturing process, the spark detection metal roller is disposed upstream of the power supply roller for the pre-stage etching, but the spark detection metal roller is also disposed upstream of the power supply roller for the post-stage etching. It is possible to obtain the same effect as the previous etching.

  Further, even when the direct current etching foil is formed, the same effect as that of the previous etching can be obtained by forming (anodic oxidation) using a device having a power supply treatment tank in the forming device. In particular, the formation of a direct current etching foil is performed after a boil treatment is performed as a pretreatment to form a hydroxide film, so that the hydroxide film falls off and sparks are likely to occur in the feed roller. is there.

  An apparatus for producing an electrode foil for an electrolytic capacitor and a production method using the same according to the present invention prevent a spark generated between a power supply roller and an electrode foil, and stabilize a capacitor electrode foil excellent in quality and cost. It is particularly useful for small-sized and large-capacity electrolytic capacitors that require high performance and high quality.

The conceptual diagram which showed the structure of the processing tank of the power supply in the manufacturing apparatus of the electrode foil for electrolytic capacitors by one embodiment of this invention Manufacturing process diagram of DC etching foil in electrode foil for electrolytic capacitor Spark waveform diagram of judgment unit The conceptual diagram which showed the structure of the processing tank of the power supply in the conventional manufacturing apparatus of the electrode foil for electrolytic capacitors

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrode foil 2 Processing tank 3 Etching liquid 4 Feed roller 5 In-tank roller 6 Outlet roller 7 Cathode plate 8 Power supply 9 Spark detection metal roller 10 Judgment part 11 Recording part

Claims (4)

A treatment tank provided with at least a pair of cathode plates and filled with an etching solution, a carry-in portion for feeding electrode foil into the treatment tank, and a plurality of electrodes provided so that the electrode foil travels inside the treatment tank The power supply power processing tank comprising at least a power supply comprising a traveling roller and a power supply roller connected to the negative electrode and a power supply roller provided in the carry-in portion connected to the negative electrode. In an apparatus for producing an electrode foil for an electrolytic capacitor that etches an electrode foil, a spark detection metal roller is disposed upstream of a power supply roller in the carry-in portion, and a spark generated by the power supply roller is detected by a spark detection metal roller. An apparatus for manufacturing an electrode foil for an electrolytic capacitor, comprising a determination unit that detects and performs comparison determination with a preset spark waveform. The apparatus for producing an electrode foil for an electrolytic capacitor according to claim 1, wherein a spray portion for wetting the electrode foil with water is provided in a portion that runs on the power supply roller to increase the detection accuracy of the spark. A treatment tank provided with at least a pair of cathode plates and filled with an etching solution, a carry-in portion for feeding electrode foil into the treatment tank, and a plurality of electrodes provided so that the electrode foil travels inside the treatment tank The power supply including at least a power supply processing tank comprising a traveling roller and a power supply in which a power supply roller provided in the carry-in portion is connected to a positive electrode and a pair of cathode plates disposed in the processing tank are connected to a negative electrode. In the method of manufacturing an electrode foil for an electrolytic capacitor in which a DC voltage is applied between a roller and a pair of cathode plates to etch the electrode foil, a spark detection metal roller is provided upstream of the power supply roller, and the electrode foil is A method of manufacturing an electrode foil for an electrolytic capacitor in which a power supply roller is wetted with water and the spark generated by the power supply roller is detected by a spark detection metal roller. The method for manufacturing an electrode foil for an electrolytic capacitor according to claim 3, wherein the detected spark is compared with a preset voltage and time, and when the detected spark exceeds the detected voltage, the electrode foil travel is stopped.

Images