Laser marking technology helps PCB board information traceability

As one of the most important components in the contemporary electronic component industry, PCB boards are applied to almost all electronic products and are called "the mother of electronic system products". With the increasing quality requirements of PCB boards, in order to better realize the quality information management and control of products in production, information traceability systems such as marking characters, bar codes, and two-dimensional codes on PCB boards have emerged.

At present, PCB marking processing mainly includes two methods: silk screen printing and laser marking.

Traditional silk-screen printing uses a well-made graphic screen, and uses external pressure to make the character ink penetrate through part of the mesh of the screen and miss the printing on the surface of the circuit board. The remaining part of the mesh on the screen will be blocked and will not penetrate the ink. Only a blank will be formed on the surface of the circuit board. The missing ink will form characters, logos, patterns, etc. This processing method is relatively cheap and fast, but it has the disadvantages of rough marking effect, easy marking off, inability to mark small PCB boards, and chemical raw materials that have certain toxicity.

Laser marking uses high-energy-density lasers to locally irradiate the PCB board to vaporize or discolor the surface material, thereby leaving a permanent mark. This non-contact processing can mark a very clear two-dimensional code on a very small format, ensuring high precision and high quality, and will not be worn due to high and low temperature, acid-base changes and external friction. No chemical substances are required, and there is no negative effect on personnel safety and the environment.

The use of PCB special laser marking machine, with its precision and flexibility, can make up for the shortcomings of screen printing, greatly improve production efficiency and yield, reduce costs, and reduce pollution. Laser marking is gradually becoming the best method for PCB marking, and has been widely used in many fields such as digital products, wearable devices, and automotive circuit boards.