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How Does Laser Technology Replace Silk Screen In The Area Of PCB Marking?
Aug 07, 2018

Following the pace of the industry 4.0 era, laser marking is also constantly breaking through, gradually replacing the traditional silk screen processing, bringing new vitality to the manufacturing industry in a more convenient way. Among them, the development of related industries including PCB circuit board is inseparable from the innovative application of laser marking. The precision and flexibility of laser marking make up for the shortcomings of silk screen processing, and it has gradually become the best way to mark PCB and plays a pivotal role in the circuit board industry.

As one of the most important components in the contemporary electronic components industry, PCB board is applied to almost all electronic products and is called "the mother of electronic system products". With the continuous development of smart phone technology and wearable electronic technology, intelligent, thin and light, and miniaturization have become mainstream. Manufacturers are increasingly demanding the production of PCB circuit boards in these electronic products. In order to better realize the quality information management and control of products, traceability systems such as marking characters, barcodes, and QR codes on the PCB have emerged.

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The traditional silk screen processing uses a well-made graphic screen to transmit the character ink from a part of the mesh of the screen and leaks on the surface of the board by external pressure. The rest of the mesh on the screen will be blocked, not through the ink, only blank on the surface of the board, the ink under the leak will form the text, logo, pattern and so on. This kind of processing method is relatively cheap and the processing speed is fast, but there are shortcomings such as rough marking effect, easy to fall off the logo, unable to mark small size PCB board, and certain toxicity of chemical raw materials.

Laser marking uses a high-energy-density laser to locally illuminate the PCB, causing the surface material to vaporize or discolor, leaving a permanent mark. This non-contact machining marks very clear two-dimensional codes on very small area, ensuring high precision while maintaining high quality. At the same time, the laser marking is not worn by high and low temperature, acid and alkali changes and external friction, and does not require chemical assistance, and has no negative effect on personnel safety and environment.

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Lser marking machine for PCB has better precision and flexibility, can make up for the shortcomings of silk screen processing, greatly improve production efficiency and yield, reduce cost and reduce pollution.