1. Poor wear resistance, the wear resistance said here is not the wear resistance of metal materials, which refers to the PCB surface ink in use will often be worn off causing blurring, fading and so on.

　　2. Aesthetic requirements, the appearance of the metal surface printing feels relatively low-end, which is not suitable for some products with relatively high appearance requirements, such as commemorative badges, metal business cards, exquisite company promotional nameplates, handicraft description nameplates, etc., which cannot meet their appearance requirements.

　　3. Ordinary printing process requires the use of organic solvents and heavy metal elements and other chemical raw materials, these substances have certain toxicity and will cause personal injury to the screen printing staff, in addition, the drying process of screen printing ink, volatile chemical raw materials gradually volatilized into the air, causing pollution to the air and the environment.

　　Compared with traditional printing technology, laser marking technology has a variety of advantages:

　　1. Good quality, wear resistance. PCB surface marking clear and beautiful, can mark a variety of LOGO, pattern, two-dimensional code, text and the pattern is directly engraved on the material, wear resistance is more prominent;

　　2. High processing precision. After the laser beam is focused, the minimum spot diameter of the laser beam can reach 10um (UV laser), which has a small benefit in the processing of complex graphics and precision machining;

　　3. High efficiency, simple operation and low cost. The user only needs to set the parameters on the computer to mark directly, and the surface of the material can be marked in just a few seconds to ten seconds.