The Aluminum Electrolytic Capacitor Manufacturing Process

The manufacturing process flow for the aluminum electrolytic capacitors is as follows:

Slit		The anode foil, cathode foil, and electrolyte paper are cut to the specified width from the source rolls of the specified length.
Lead Attachment		Leads for contacting the cathode and anode foil electrodes are attached either by crimping or by ultrasonic welding.
Coiling		The electrolytic paper is layered between the anode foil and the electrode foil. A coiled construction separates the electrodes. When the structure is coiled in this manner it is known as an "element."
Filling		The element is filled with the electrolyte using, for example, the vacuum method.
Assembly		The rubber plug is attached to the filled element. Then, the element is placed in the case.
Sleeve Attachment		The case is slipped into a sleeve printed with the rated voltage, capacitance, and polarity. After which, the sleeve is heat shrunk on to the case.
Aging		The specified voltage is applied to grow an anode oxide thin film on the cut surface end and on any flaws in the formed oxide thin film.
Inspection		All units are subjected to functional testing and cosmetic inspection. Non-conforming units are removed from production.