RFH 355nm nano -seconds ultraviolet solid laser without trace marking mobile phone case   Laser marking mobile phone composite board, still need to see RFH high -power ultraviolet laser   The mobile phone composite board is made of a variety of materials such as PC, PMMA, UV transfer texture layer. Its non -metallic rear cover has become standard in the 5G era. Skills are continuously improved. Playing on the mobile phone composite board has also become a problem of many manufacturers. The smooth shell, the hard strength and the composite materials are obviously that the ink injection mark cannot be achieved.