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Due to the advantages of environmental protection, low cost, high performance, simple design and assembly, vacuum sputtering EMI coating process meets the requirements of environmental protection, ease of use and lightweight of 3C products, represents the development direction of EMI treatment process, and can replace the original process means such as metal shielding cover and conductive paint spraying EMI. At present, it is used in projectors and electric paints. The notebook computer (NB), mobile phone, household electronic products and other industries have been widely used, the application prospects are very broad...