Calendered copper foil It is a product made by repeatedly rolling and annealing high-precision copper strip (usually less than 150 microns in thickness) based on the principle of plastic processing (usually 4-100 microns in thickness and<800 mm in width). Its ductility, bending resistance and conductivity are better than The purity of copper is also higher than that of electrolytic copper foil

Copper foil is an indispensable raw material for making printed circuit board (PCB), copper clad plate (CCL) and lithium-ion battery. Industrial copper foil can be divided into calendered copper foil and electrolytic copper foil according to its manufacturing process. Electrolytic copper foil is made by electrolysis of copper based on electrochemical principle. The internal structure of raw foil is vertical acicular crystal structure, and its production cost is relatively low. The calendered copper foil is made by repeated rolling annealing process of copper ingot based on the plastic processing principle. Its internal structure is lamellar crystal structure, and the calendered copper foil has good ductility. At present, electrolytic copper foil is mainly used in the production of rigid circuit boards, while calendered copper foil is mainly used for flexible and Medium.