Zhenjiang Optimal Processing of Double Conductive Copper Foil
Calendered copper foil products have good ductility, flexibility, low roughness and high folding resistance, and have become the basic materials of flexible printed circuit boards, mainly used in flexible circuit boards and high-frequency circuit boards.
Zhenjiang Optimal Processing of Double Conductive Copper Foil
With electrolytic copper or wire return material of equal purity as raw material, it is dissolved in the solution containing copper sulfate. Electrolysis is carried out in an electrolytic cell with insoluble material as anode and cathode roller immersed in copper sulfate electrolyte at constant speed as cathode. Copper in the solution is deposited on the surface of cathode roller to form copper foil. The thickness is controlled by cathode current density and cathode roller speed. After the roller rotates out of the liquid level, it is continuously stripped from the cathode roll, washed, dried and rolled to generate the original foil.
Zhenjiang Optimal Processing of Double Conductive Copper Foil
Copper foil can be divided into many kinds according to different classifications. According to the thickness, it can be divided into: thickness (more than 70 μ m) Regular thickness copper foil (more than 18 μ M but less than 70 μ m) Thin copper foil (more than 12 μ M but less than 18 μ m) Ultra thin copper foil (less than 12 μ m) Etc.
Zhenjiang Optimal Processing of Double Conductive Copper Foil
At the same time of thinning, it is also necessary to improve the tensile strength, elongation and other indicators, otherwise it is easy to cause copper foil fracture, affecting the safety of the battery. Therefore, it is the general trend that the future use will be more light and meet the above indicators.
Zhenjiang Optimal Processing of Double Conductive Copper Foil
Surface passivation: chromate (or chromate and zinc salt) solution is used for surface passivation (i.e. anti oxidation treatment) after the barrier layer is plated to form a complex film with chromium (or chromium zinc) as the main body on the surface, so that the copper foil will not be oxidized and discolored due to direct contact with air, and at the same time, the heat resistance of the copper foil is improved (higher zinc content, better heat resistance), The storage period of copper foil can reach 3 months.
Zhenjiang Optimal Processing of Double Conductive Copper Foil
The commonly used reinforcement materials of copper clad laminate are alkali free (alkali metal oxide content shall not exceed 0.5%) glass fiber products (such as glass cloth, glass felt) or paper (such as wood pulp paper, bleached wood pulp paper, cotton wool paper). Therefore, laminates can be divided into glass cloth base and paper base.
