Plastic Laser Marking Machine 

Some industrial plastics are more suitable for laser marking than other materials. In some cases, the color contrast achievable by using a laser does not meet the readability and high quality marking required by fast marking techniques. However, this problem can be solved by the use of special laser-sensitive additives such as fillers, stabilizers and non-fading pigments. This greatly improves the optional experimental study for laser marking materials. Plastics commonly suitable for these experiments are polyethylene, polystyrene, polyoxymethylene, polyurethane, polypropylene, polyvinyl chloride.

Laser absorption characteristics of different plastics

In order to be used for laser marking, plastic must absorb a certain amount of laser beam. At the macro level, most plastics only absorb ultraviolet and far infrared rays in the electromagnetic spectrum (CO2 laser, wavelength 10.6 microns). However, by using additives, fillers and pigments, the absorption characteristics of the material can be altered to increase its ability to absorb laser beams in the near-infrared (1064 nm) or visible green (532 nm) bands. This allows for faster processing and better contrast. It is always recommended to test with different laser technologies on the material you want to use to see which is the right one.

Most of the lasers used for marking emit red light at a wavelength of 1064 nm. But tools designed specifically for processing plastic and semiconductor materials enable lasers to operate in the green (532 nm) and ultraviolet (355 nm) range. The application of ultraviolet light is particularly interesting because they open up a new era of plastic marking. The energy produced by short-wave ultraviolet light initiates a photochemical reaction but does not destroy the material due to excessive heat input. When processing important materials such as plastics incorporating flame retardants, these laser sources are capable of high-contrast marking at very fast processing speeds with the best surface qualit