Laser engraving, which is a subset of laser marking, is the practice of using lasers to engrave an object. Laser marking, on the other hand, is a broader category of methods to leave marks on an object, which also includes color change due to chemical/molecular alteration, charring, foaming, melting, ablation, and more. The technique does not involve the use of inks, nor does it involve tool bits which contact the engraving surface and wear out, giving it an advantage over alternative engraving or marking technologies where inks or bit heads have to be replaced regularly.
The impact of laser marking has been more pronounced for specially designed “laserable” materials and also for some paints. These include laser-sensitive polymers and novel metal alloys. Plastic security seals have a special additive impregnated in material which is sensitive to length wave of laser resulting the laser printing on plastic seals.
The machines for laser engraving and laser marking are the same so that the two terms are sometimes confused by those without knowledge or experience in the practice.
Aldo Security has in 11 laser marking units (YAG and UV) as a stand-alone unit or integrated into automatic stations.