1. Foaming: Once the base material is exposed to the laser, it's created gas bubbles by thermal effects. The gasified and evaporated gas bubbles are enclosed in the surface layer of the base material in a whitish raised state. The dark base material will become a lighter color one. Eg: The black base material will turn to gray one while the red base material will turn to pink one.
2. Concentration: As long as the base material absorbs the energy of the laser, the molecular density rises due to the thermal effect and becomes darker after concentration.
3. Carbonization: Continuing exposure to higher energy, the polymer around the base material will have carbonation and become black.
4. Chemical Changes: The pigment component of the base material must contain metal ions. By irradiating the laser, the structural change of the ionic crystal and the water content in the crystal will change, so will its chemical composition. The color of base material will also be changed because of the increasing concentration of pigments.
HBS CO2 laser machine series can mark on the resin as well as other non-metal material.