The Application and Manufacturing Process of Electronic Aluminum Foil

Aluminum electrolytic capacitors are of small size, large capacitance and low cost. Especially, the price per unit capacitance of the aluminum capacitor is relatively cheap among all capacitors, which is in line with the development trend of low-cost information products.

At present, the output of aluminum electrolytic capacitors accounts for 30% of the total output of capacitors. Electronic aluminum foil, that is, aluminum foil for electrolytic capacitors, is used as the positive and negative electrodes of electrolytic capacitors, accounting for about 70% of the production cost of aluminum electrolytic capacitors.

Electronic aluminum foil is the aluminum foil for electrolytic capacitors, which can be divided into anode foil and negative electrode foil. Anode foil refers to the aluminum foil used as the anode in electrolytic capacitors. Negative electrode foil refers to the aluminum foil used as the negative electrode in electrolytic capacitors.

The main key points of the electronic aluminum foil production process are the four key processes of melting and casting, hot rolling, cold rolling and annealing. The production process of electronic aluminum foil is divided into anode foil production process and cathode foil production process:

The production process of anode foil is - refined aluminum smelting→casting→sawing→ingot milling→heating-hot rolling→cold rolling→edge trimming→(intermediate annealing)→foil rolling→(stretching and straightening)→(oil cleaning)→shearing→ (vacuum finished product annealing) → rewinding → inspection → anode foil.

The production process of cathode foil is smelting→rolling coil→cold rolling→edge trimming→intermediate annealing→cold rolling→foil rolling and slitting→inspection, packaging→cathode foil.

The main production equipment of electronic aluminum foil includes melting furnace, holding furnace, on-line refining, casting machine, casting and rolling machine, ingot sawing machine, milling unit, ingot heating furnace, hot rolling unit, cold rolling unit, aluminum foil rolling mill, shearing unit , cleaning unit, rewinding unit and vacuum protective gas annealing furnace, etc.

Due to the small size of electronic aluminum foil products, the melting furnace group and casting machine are usually selected at about 30t, the hot rolling mill is generally about 1600mm, and the width of the cold rolling mill and aluminum foil rolling mill is about 1450mm.

The production of electronic aluminum foil is a precision processing process, and the product quality has an important relationship with the control of the process and the advanced level of equipment. Electronic aluminum foil, especially anode foil, should strictly control the production process parameters and strengthen the research on the annealing process of aluminum foil to improve the performance and internal structure of electronic aluminum foil.

The 1xxx and 3xxx aluminum foil of Haomei Aluminum like 1060 and 3003 aluminum foil roll can be used for electronic capacitor. The foil rolling mill introduced by our company is designed and installed by Zhuoshen Company, and adopts ANDRITZ rollers. Haomei Aluminum adopts full hydraulic control, and cooperates with high-precision pressure sensors and servo valves to achieve excellent roll gaps and ensure the electronic foil production quality.