The laser marking for blackening is typically made on steels and titanium and is obtained through the material surface heating and consequent oxidation. Based on the parameters used, different temperatures and therefore different oxide thicknesses will be obtained giving the typical color effect of the marking.
This technique is used in a wide range of applications such as the marking of tools, medical equipment, automotive components, glasses or hobs.
The very high energy density generated by the laser allows layers of material to evaporate, allowing you to reach controlled depths in the order of hundredths, tenths or in some cases of millimeters.
Removal can be performed on practically any material, metal, plastic, organic or even ceramic.
This is the technique used to engrave in the field of fashion, molds or mechanics in general.
On plastics, markings can be obtained by exploiting the color change of the material, there are two main processes: carbonization or discoloration.
Laser light absorption by plastic causes changes in the chemical composition mainly related to carbon, if the carbon oxidizes it produces the classic dark marking, if instead it is released there is a clear marking.
Color change is the most commonly used plastic marking technique in electronics, including consumer, in automotive or in animal identification.
NIGHT & DAY
The technique of removing layers of paint on plastic substrates is widely used for backlit keys production, for example in the automotive field for instrumentation or in the computer world for keyboards.