JPH0936001A - Manufacture of electrolytic condenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rationalize the process by applying an ink material beforehand on a predetermined surface of an armor case of an electrolytic condenser in which condenser elements are sealed, and then aging the electrolytic condenser at a constant temperature bath to carrying out both of the aging process and the ink material drying process simultaneously. SOLUTION: An electrolytic condenser 1 is inverted so that an armor case 2 faces downwards. An ink applying apparatus 10 is provided in the ink applying process. The apparatus 10 has an ink roller 11 for applying an ink material on the electrolytic condenser 1 and an intermediate roller 12 for transferring the ink material to the ink roller 11, and spreads the ink material on the whole or part of the top surface 2a of the armor case 2 by means of the ink roller 11. Then, it is received in a constant temperature bath for aging and aging is carried out. During the aging, the ink material is dried simultaneously by the heat thereof. After the again, the electrolytic condenser 1 is taken out from the constant temperature bath and provided with an indication of product information in the next step of laser marking process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an electrolytic capacitor, and more specifically, to a process for rationalizing an electrolytic capacitor by incorporating a marking process for an outer case into a series of processes including aging. The present invention relates to a manufacturing method.

[0002]

2. Description of the Related Art Normally, an outer case of an electrolytic capacitor is printed with a polarity display mark and its rated voltage and capacitance value. Conventionally, this printed display is performed as follows for an electrolytic capacitor that has been determined to be a non-defective product through an aging inspection process. That is, UV curable UV ink was applied to the top surface of the outer case through a printing plate, and then the ink was dried by irradiating it with UV light for a predetermined time.

[0003]

However, this has the following problems. Since the ink is dried by the irradiation of ultraviolet rays, power control of the ultraviolet rays (lamp voltage adjustment, focal length control, etc.) is required. Generally, the life of an ultraviolet lamp is about 1000 hours, so it must be replaced periodically.

Further, it is not only necessary to prepare a printing plate for each different product or manufacturing date, but also for each printing plate replacement, printing pressure adjustment, ink density adjustment, and printing. Position adjustments must be made.

The present invention has been made to solve such a conventional problem, and an object thereof is to incorporate a marking process for an outer case into a series of processes including aging so as to rationalize the process. Another object of the present invention is to provide a method for manufacturing the electrolytic capacitor.

[0006]

In order to achieve the above object, the present invention is to apply an ink material to a predetermined surface of an outer case of an electrolytic capacitor in which a capacitor element is sealed, and then to apply the ink capacitor at a predetermined temperature. Aging in a constant temperature bath kept at the same time, the above-mentioned ink material is dried by the heat at the time of aging, and then a predetermined product information such as polarity display and electrostatic capacity on the ink material by laser printing means. It is characterized by marking.

In this case, a one-stroke writing type (scanning type) laser marker can be used as the laser printing means. According to this, a predetermined character or symbol can be displayed without a mask corresponding to a printing plate. You can
On the other hand, the laser printing means may be a mask type laser marker. According to this, although a mask is required, it is possible to print at a higher speed than the one-stroke writing method. Further, it is possible to print while conveying the electrolytic capacitor.

On the other hand, instead of the above ink material, a coloring material which reacts with laser may be used. Examples of such a coloring material include an epoxy resin composition containing a laser coloring material such as basic copper carbonate and calcium hydroxide, and an epoxy resin composition containing a laser coloring material such as ferric hydroxide and silicic acid. Examples include those containing zirconium and those obtained by mixing a laser colorant such as copper oxalate having a specific particle size with an epoxy resin composition. Specifically, Sumitomo Bakelite's epoxy coloring material Sumimac ECR
-1163 / ECH-1, Kayatron laser paste BR-0504N, BK-0104N manufactured by Nippon Kayaku Co., Ltd. are exemplified.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in more detail with reference to FIGS. 1 and 2. FIG. 1 schematically shows an inspection process including an aging process after assembling an electrolytic capacitor along the flow of a conveyor, and an electrolytic capacitor to be marked according to the present invention is shown in FIG. .

Explaining step by step, the electrolytic capacitor 1 (see FIG. 2) assembled through an assembling step (not shown) is put into a main feeder such as a ball feeder and sent to a linear feeder via a sub feeder. The electrolytic capacitors 1 are arranged in a line by the linear feeder, and the outer case 2 is inverted (inverted) so as to face downward as shown in FIG. Then, it is transferred to the conveyor.

Then, the lead terminals 3a, 3b are first shaped so as to be straight, for example, and subsequently their polarities are detected. This polarity detection is for lead terminal 3
It is carried out based on the lengths of a and 3b, and the longer one is usually on the anode side, and the one mounted on the conveyor with the opposite polarity has a polarity reversing means (not shown).
The position is changed by 0 degree.

Next, a short-open inspection is carried out, and as a result, NG products that have become NG are removed from the transport conveyor, and those that have been determined to be non-defective move to the ink coating process. In this ink coating step, an ink coating device 10 as shown in FIG. 2 is provided. In this embodiment, the ink applying device 10 is an electrolytic capacitor 1
The structure having the ink roller 11 for applying the ink material to the ink roller and the intermediate roller 12 for transferring the ink material to the ink roller 11 is the simplest one.
1, the ink material is applied to the entire top surface 2a of the outer case 2 or a part of the top surface 2a in a so-called solid coating form.

After that, it is placed in a constant temperature bath for aging. In performing aging, the badge process is adopted in this embodiment. That is, for example, 30
The individual electrolytic capacitors 1 are housed in the same jig, and a constant temperature of, for example, 85 to 105 ° C. is applied in a state where a predetermined aging voltage (eg, DC 3 to 125 V) is applied to each of them through a charging resistance of 500 Ω. The inside of the tank is slowly transferred by an aging conveyor for 40 to 100 minutes.

In this way, the aging is performed, and at the same time, in the present invention, the ink material is dried by the heat. Therefore, in the present invention, the ink material is selected so that the drying is completed depending on the aging temperature and the time. The electrolytic capacitor 1 taken out from the constant temperature bath after this aging is displayed with predetermined product information in the laser marking step of the next stage.

That is, the laser marking process is provided with a laser printing means by laser irradiation, whereby the product information peculiar to the electrolytic capacitor such as the mark for the polarity indication, the rated voltage and the electrostatic capacitance is provided on the ink material. Is printed.

In this case, the laser printing means may be so-called one-stroke writing (scan type) or mask type. In the case of one-stroke writing, a print mask is not required, so changes in the print contents can be handled by changing the print program.
It is necessary to stop the transport conveyor during the printing.

On the other hand, in the case of the mask type, it is possible to print in the state of continuous transfer without stopping the conveyer, but it is necessary to change the mask every time the print content is different. In any case, the advantage of the present invention can be shared in that the ink material can be dried together with the aging treatment.

Thereafter, the leakage current is measured, and the electric charge charged in the electrolytic capacitor is discharged.
Subsequently, the capacitance and the loss rate are measured, and as a result, the product regarded as a good product is taken out. As described above, the ink material is dried during the aging step, that is, the step is also used, so that a great rationalization can be achieved as compared with the conventional case in view of the entire manufacturing process of the electrolytic capacitor.

In the above embodiment, laser marking is performed immediately after aging, but the leakage current may be measured before that and laser marking may be performed thereafter. In short, since the gist of the present invention is to dry the ink material at the same time as the aging, it is an arbitrary matter when the laser marking is performed after the aging.

[0020]

As described above, according to the present invention,
The following effects are obtained. That is, since the aging step and the ink material drying step can be combined,
It is possible to omit one step as compared with the conventional method.

Further, since the ultraviolet irradiation lamp is not particularly required, the cost reduction and the management cost are not required. Furthermore, since the ink material may be simply filled, printing pressure adjustment and display position adjustment are not required. Furthermore, according to the one-stroke writing laser printing means, a printing plate is not particularly required, so that it is possible to easily deal with a change in display content.

On the other hand, according to the mask type laser printing means, although a mask corresponding to a printing plate is required, there is an advantage that printing can be performed without stopping the conveyor. However, in any case, because the laser is used for display, clear marking can be obtained without bleeding.

[Brief description of drawings]

FIG. 1 is a schematic view showing a method for manufacturing an electrolytic capacitor of the present invention mainly by focusing on an aging step thereof.

FIG. 2 is a schematic diagram showing a printing device in the ink applying step in FIG.

[Explanation of symbols]

 1 Electrolytic Capacitor 2 Outer Case 3a, 3b Lead Terminal 10 Ink Coating Device 11 Ink Roller 12 Intermediate Roller

Claims (4)

[Claims] 1. An ink material is applied in advance on a predetermined surface of an outer case of an electrolytic capacitor in which a capacitor element is enclosed, and then the electrolytic capacitor is aged in a constant temperature bath kept at a predetermined temperature, and at the time of aging. The method for producing an electrolytic capacitor, characterized in that the ink material is dried by the heat of, and then predetermined product information such as polarity display and capacitance is marked on the ink material by laser printing means. 2. The method for producing an electrolytic capacitor according to claim 1, wherein the laser printing means is a one-stroke writing type (scanning type) laser marker. 3. The method for producing an electrolytic capacitor according to claim 1, wherein the laser printing means is a mask type laser marker. 4. The method for producing an electrolytic capacitor according to claim 1, wherein a coloring material that reacts with laser is used instead of the ink material.