355 high-power UV laser marking food packaging production date To mark the production date of food packaging, choose RFH 355nm UV laser UV laser solves the safety problem of marking the production date of plastic packaging     Food is the top priority for the people, and food safety has always been a problem that plagues us. In the traditional process, ink jet printing is used to mark the production date of food packaging, but since the advent of laser technology, it has gradually replaced the ink jet printing process. Laser marking uses different laser sources according to industry applications. For example, fiber laser marking is used for metal surface marking, while 355-wavelength ultraviolet lasers are used for food plastic packaging materials.