![]() ![]() ![]() Color change laser marking is an electrical process that reorders or destroys pigmented macromolecules and ensures maximum readability. This technique has slightly longer marking times than other processes. The surface of the plastic is thus carbonized due to the concentration of carbon. During the carbonization process, the laser heats the surface of the material which releases oxygen and hydrogen. This technique allows to obtain strong color contrasts on bright surfaces and can be used for both polymers and biopolymers. In this case the laser operates at a low power level and with longer pulses. Depending on the material this sign is light or dark in color. The heat induced by the laser melts the surface and later, due to the rapid cooling, the bubbles remain encapsulated in the material, thus forming a positive sign, which can be touched by hand.
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