Shielding cover is a component used to shield electronic signals, and its function is to shield the influence of external electromagnetic waves on the internal circuit and the radiation of internally generated electromagnetic waves. The modern living environment is full of electromagnetic waves, and electromagnetic waves have certain interference with the reception and processing of signals by communication equipment. In a closed or nearly closed metal shell or metal mesh, this metal shell or mesh is called a shield. Shielding covers are mainly used in mobile phones, GPS, circuit boards, base stations, automobiles, electrical and other fields to shield electromagnetic interference (EMI) and protect components and LCMs on PCB boards.