Aluminum electrolytic capacitor Manufacturing Process
Manufacturing Process of aluminum electrolytic capacitors is as follows.
| ① Etching (for extending the surface area) |
This etching process serves to extend the surface area of the aluminum foil. This is an AC or DCcurrent-employed electrochemical process for etching the foil surface in a chloride solution. |  |
| ② Formation (for forming a dielectric) |
This etching process serves to extend the surface area of the aluminum foil. This is an AC or DCcurrent-employed electrochemical process for etching the foil surface in a chloride solution. | |
| ③ Slitting | This is a process for slitting aluminum foils (both the anode and cathode) and paper separators to the specified product size. | |
| ④ Winding | This is a process for rolling a set of anode and cathode foils into a cylindrical form with a paper separator inserted between them. During this process, an inner terminal (called a tab) is attached to each of the aluminum foils. The roll made at this process is called a capacitor element. | |
| ⑤ Impregnation | This is a process for impregnating the element with electrolyte as a true cathode. The electrolyte also functions to repair the dielectric layer. | |
| ⑥ Sealing | This process seals the element using the aluminum can case and sealing materials (rubber,rubberlined cover, etc.) for keeping the case airtight. | |
| ⑦ Aging (reforming) |
The process of applying voltage to a post-sealed capacitor at high temperature is called “aging”. This serves to repair defective dielectrics that have been made on the foil during the slitting or winding process | |
| ⑧ 100% inspection and packaging | After the aging, all products shall undergo testing for checking their electrical characteristics with chip termination, lead reforming, taping etc. finished, and then be packaged. | |
| ⑨ Outgoing inspections | Outgoing inspections are performed as per standard inspection procedures | |
| ⑩ Shipment |
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