355nm UV Laser Marking Transformer Insulation Materials

The daily electricity consumption of Chinese residents is alternating current, and the voltage is generally 220v. In real life, the power supply voltage required by common electronic device products is generally about 5v to 20v, so it is often not possible to directly use 220v alternating current. Here, it is necessary to obtain suitable various voltages through transformers, and this type of transformer is widely used in lighting, communication, consumer electronics, and smart homes.

Among the constituent materials of the transformer, the insulating material is one of the most important materials, and its performance and quality directly affect the reliability of the transformer operation and the service life of the transformer. Mala tape (based on polyester film PET film) or polyimide film (PI film) is often used in the industry, and some product specifications, model, production date, after-sales and other product information of the product are marked on its surface.

Since heat is generated in the process of voltage transformation, if the ink spraying method is used, it is easy to gradually fade, blur, or even disappear over time, which is not conducive to product management and traceability. Using laser marking to replace the traditional labeling and coding process to achieve permanent marking has many advantages such as high marking accuracy, fast processing speed, high automation level, no mechanical stress damage to the processed items, no consumables, more environmentally friendly .

Because the marking process requires that clear and beautiful character strings, two-dimensional codes and other pictures and texts be marked on the surface of the two insulating materials of polyester film, PET film or PI film, without penetrating the film layer, without deformation. According to the process requirements, the 355nm UV nanosecond laser can effectively meet the marking requirements of this type of material. It has a short wavelength, high material absorption rate, and high single-photon energy of 355nm ultraviolet light, the bond energy is 3.49ev, and the bond energy of the C-C bond is 3.4eV, so it can break the chemical bond to achieve labeling, which is a kind of Photochemical principle, "close cooperation" with the ultra-narrow pulse width of the laser (about 25ns), low thermal effect, small heat-affected zone, and no deformation of the marking material. The high beam quality (M2<1.2) and the easy-to-focus characteristics of 355nm ultraviolet light make the light spot smaller, and the line width of the marked graphic information can reach the micron level, which cannot be achieved by the traditional marking process. The marking edge is smooth, beautiful, and the overall contrast is high. It can easily and clearly mark some parameters, as well as readable QR codes and SN after-sales codes.

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