The basic principle of laser marking is that a high-energy continuous laser beam is generated by a laser generator. The focused laser acts on the printing material to instantly melt or even vaporize the surface material. By controlling the path of the laser on the surface of the material, a Graphical markers required. Laser marking is characterized by non-contact processing, which can be marked on any special-shaped surface, and the workpiece will not deform and generate internal stress. It is suitable for marking metal, plastic, glass, ceramics, wood, leather and other materials. Laser marking costs are relatively low, speed is fast, and the effect is very good. Therefore, this technology is still widely used when printing LOGO on backpacks. Generally, most of the logos on common hardware brands are carved by laser.