Compared to the traditional ink injection, RFH's solid State Q-SWITCHED UV Laser has well solved its shortcomings such as easy modification, non-environmental protection, limited anti-counterfeiting effects, and unable to use it for a long time, which fully meets the production requirements of plastic packaging bags. Solid State Q-SWITCHED UV Laser beam is superior quality. It can be run in all frequency bands, and it can be produced for 24 hours. It is no longer necessary to replace the ink cartridge on a regular basis.