355nm UV nanosecond laser marking air switch

Nowadays, all kinds of electronic and electrical products have been moved into indoor buildings such as homes, offices and factories. At the same time, with the standardization of decoration and decoration, air switches have become a necessity for circuit safety. Once a trip occurs, people only need to open the switch box, accurately find the circuit "in charge" of each part of the switch according to the marks on the air switch, and conduct a simple investigation.

Therefore, whether the marking on the surface of the air switch is clear or not is very critical.

The air switch is a plastic product. In the past, the trademarks, barcodes and numbers on its surface were mainly completed by label sticking, mold imprinting or inkjet printing. The advantages of these traditional marking methods are low input cost and obvious disadvantages: lack of Flexibility, non-permanent marking, insufficient clarity, many consumables and possible environmental pollution, etc.

In recent years, laser marking of plastics has become the mainstream of industrial applications, improving production efficiency and reducing equipment production costs. Compared with traditional marking processes, it has great advantages and has a tendency to replace them. It is a popular marking technology. The type of laser used in the laser marking plastic process is also known as the 355nm ultraviolet nanosecond laser. With the characteristics of short wavelength, high single photon capability, high peak power, and narrow pulse width, it can bring high contrast and narrow pulse width on the surface of plastic products. Line width, low-carbon marking is one of the current mainstream industrial-grade lasers for laser marking, and has been widely used in 3C consumer electronics, electrical, medical and health, automotive industry and other industries.

The single photon of the 355nm ultraviolet laser reaches 3.49eV, the C-C bond energy in plastic products is 3.44eV, the C-O bond energy is 3.37eV, and the C-N bond energy is 3.16eV, the single photon energy of visible ultraviolet light is higher, suitable for plastics such as The materials with high thermal radiation reaction are finely marked, and most materials have high absorption rate of ultraviolet light, which makes it easy to break the chemical bonds when the high-energy density 355nm ultraviolet light acts on the plastic surface, without causing thermal damage to the material. , The narrow pulse width of about 25ns also makes the heat of the laser fade away before it can gather, and the heat-affected zone is very small. This marking process is also called "cold processing".

The beam quality of the 355nm ultraviolet nanosecond laser is high (M2<1.2), and the ultraviolet light is easy to focus, so the diameter of the spot output from the galvanometer can reach the micron level. Such a small spot diameter makes the marking effect high contrast, clear edges, and marked The surface is smooth and natural, will not damage nearby materials, and is fine and permanent. In addition to marking conventional symbols and production dates, it can also carry out complex QR code marking, so that the anti-counterfeiting and traceability of products can be improved to a higher level.

It is worth mentioning that laser processing has no consumables, high flexibility, and easy integration. It is easy to realize automatic processing and improve processing efficiency, which is also of great significance for air switch processing.