The Plastic bags or boxes of more types of materials, PET, PC, HDPE, PE, PP, ABS and PBT and so on. Generally, if the bag is thick, it can be marked with the CO2 laser marking system.
The adverse effect of CO2 laser engraving is high heat, easy to burn the bag or partially deform the bag to affect the appearance. If the packaging bag to be marked darker color, laser marking can be used fiber optic, the principle of marking with dark cartons. If the packaging bag is thinner and the marking location is lighter and lighter, using UV laser marking may be a better choice.
In addition, some materials such as HDPE, PE, PP and other white material on the fiber laser does not absorb the CO2 laser is easy to burn, the use of green or UV laser is a better marking method.
For example Bottles of mineral water, bottle material is mainly PET, using the CO2 laser can get better marking effect.