UV laser prints white text or pattern on black plastic cover

UV lasers are widely used in industrial marking, engraving and micro-machining fields due to their unique properties. One common application is marking on a variety of materials, including white text or graphics on black plastic. So, how does UV laser achieve this effect? This article will delve into the principles behind it.

1. Basic characteristics of UV lasers

UV lasers typically have an output with a wavelength in the range of 200-400nm, which has high photon energy. This allows it to produce unique physical and chemical effects when interacting with matter.

355nm uv laser mark white on black plastic charging socket

2. Marking principle

When the ultraviolet laser beam hits the black plastic surface, the following mechanisms will occur simultaneously or sequentially:

2.1 Photothermal effect:

The high energy of the laser causes the plastic to heat and cool rapidly, forming tiny expansions and contractions, resulting in changes in the material's structure.

2.2 Photolysis effect:

The high energy of UV laser can cause certain chemical bonds in plastics to break and form new chemical structures or products.

2.3 Color change:

The structural and chemical changes mentioned above may cause the color of the plastic to change. For black plastics, these changes usually appear as white or light-colored markings.

3. Advantages

3.1 Contactless Marking:

UV laser marking is a contactless process that causes no mechanical stress or damage to the material.

3.2 High resolution:

Very fine text and patterns can be achieved, suitable for high-precision marking needs.

3.3 Drying process:

No need to use any ink or chemicals, environmentally friendly, no additional post-processing required.

3.4 Long-lasting and durable:

Compared with traditional ink marking, laser marking is more durable and not easy to wear or fade.

4. Application areas

UV laser marking has applications in a variety of fields, including electronics, medical devices, food and beverage packaging, automotive parts, and more. Black plastic covers are common in cosmetic packaging, electronic equipment, etc. The white markings are not only beautiful but also provide clear information or brand identification.

UV laser printing of white text or patterns on black plastic covers is an efficient, precise and environmentally friendly technology. The principles behind it include photothermal and photolytic effects, which lead to structural and chemical changes in materials, thereby achieving color changes. With the further development of technology, we expect that UV laser marking will be widely used in more application fields.

RFH 5w UV laser is best for plastic marking

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