The laser marking, also known as "laser engraving" is a marking method that uses laser light to mark or label parts.
How does the laser marking work?
The laser beam is focused onto the material to be marked, is absorbed and generates heat.
The heat generated in the product leaves the desired mark by one of the following mechanisms:
- Laser engraving:
The laser beam melts and vaporizes material, from getting very fine engravings which by touch are not noticed to 0.2mm-0.4mm depth, used in mould inserts.
The laser removes the top layers applied to the base material, to loosen the background material. The contrast is sought in the brand. Normally, the first layer has one colour and the base layer another one, and with the laser we can remove one layer without damaging the other one. Also used on painted metals, anodized aluminium, etc.
- Colour change:
It occurs when the laser beam causes a chemical reaction in the material, usually this colour change is found in plastics.
The composition of the plastic is essential to get more or less contrast in the marking.
The company MERCK is in continuous study on the different colour changes produced by the laser plastic compositions, thus the emergence of laser pigments help this material to make a good performance with laser marking. We can check the website: www.merck-laserforum.com
Advantages of a laser marking