What are the methods of copper foil production? What is the process of copper foil production?

Copper foil is a key conductive material in lithium ion battery and printed circuit board. Copper foil is a cathodic electrolysis material, deposited on the base layer of the circuit board of a thin, continuous metal foil. Copper foil can be divided into many kinds according to different points. Copper foil can be divided into thick copper foil (greater than 70μm), conventional thickness copper foil (greater than 18μm and less than 70μm), thin copper foil (greater than 12μm and less than 18μm), ultra-thin copper foil (less than 12μm), etc. Copper foil can also be divided into: single-sided copper foil (single-sided hair), double-sided copper foil (double-sided thick), smooth copper foil (double-sided hair), double-sided smooth copper foil (double-sided light) and very low profile copper foil (VLP copper foil) copper foil. Finally, copper foil is divided into electrolytic copper foil and calendered copper foil according to the different production methods. So today we will focus on the production of electrolytic copper foil and calendered copper foil.

Before saying the method of copper foil production, we first understand the definition of electrolytic copper foil: it is deposited by the copper ion in the electrolyte on the smooth rotating stainless steel plate (or titanium plate) circular cathode drum. The surface of copper foil close to the cathode drum is called the smooth surface, and the other side is called the hair surface.

Electrolytic copper foil production method: at present, roller cathode and insoluble anode are used to produce electrolytic copper foil continuously.

Specific steps for the production of electrolytic copper foil by roller continuous electrolysis method:

1, electrolytic copper dissolution. Returned in electrolytic copper or equivalent purity of wire material as raw material, dissolved in the solution containing copper sulfate, at the bottom by the insoluble material for the anode, immersed in the copper sulfate electrolyte zhongheng speed spin electrolytic cathode roller for cathode electrolyzer, solution of copper deposits onto the surface of the cathode roller forming copper foil, the thickness of the copper foil by cathodic current density and the cathode roller speed control. After the copper foil is rolled out of the liquid surface with the roller, it is continuously stripped from the cathode roller, washed, dried and rolled to form the original foil.

2. The surface treatment process is still based on electrochemical reaction. The process is divided into three stages: the first stage is to preserve the coarse layer of dendritic crystalline structure composed of copper and copper oxide. A second brass or zinc barrier. In the process of producing printed circuit, copper foil with barrier layer can ensure no substrate contamination such as particle migration. In the third stage, in order to prevent oxidation during handling, storage or lamination, the surface of copper foil is galvanized, nickel, tin and other metals or alloys as anti-oxidation coating.

3, namely cut packaging. Because the cutting and packaging part of the equipment has its own control device, we do not consider it here. So the whole production process can be divided into: electrolytic dissolved copper, surface dissolved copper, 10 air conditioning units, 300 thousand air conditioning units four parts.