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".

La calidad del rayo del láser ultravioleta de nanosegundos de 355nm es alta (M2<1.2), y la luz ultravioleta es fácil de enfocar, por lo que el diámetro de la salida del punto del galvanómetro puede alcanzar el nivel de micras. Un diámetro de punto tan pequeño hace que el efecto de marcado sea de alto contraste, bordes claros y marcados. La superficie es suave y natural, no dañará los materiales cercanos y es fina y permanente. Además de marcar símbolos convencionales y fechas de producción, también puede realizar un marcado de código QR complejo, de modo que la lucha contra la falsificación y la trazabilidad de los productos se pueden mejorar a un nivel superior.

Vale la pena mencionar que el procesamiento láser no tiene consumibles, alta flexibilidad y fácil integración. Es fácil realizar el procesamiento automático y mejorar la eficiencia del procesamiento, lo que también es de gran importancia para el procesamiento del cambio de aire.