Understanding the various laser types and wavelengths makes marking possible on a variety of materials. However, unless the optimal laser marker for the material being used is selected, achieving the desired finish will not be possible. This section introduces how to select the optimal laser marker for glass, paper, ceramics, printed circuit boards, and other materials.
Marking is achieved by generating minute cracks on the glass. Repeated marking at lower power allows for clearer marking.
CO2 laser markers that perform marking by applying heat to the target are optimal. Marking at high power can sometimes cause large cracks, so making multiple passes with low-power marking is most effective. Defocusing allows for adjustment of the thickness of lines.
Thermal marking melts the surface of the glass. Because quartz glass is heat-resistant, laser marking is possible without the generation of cracks.
CO2 laser markers that perform marking by applying heat to the target are optimal. With heat-resistant quartz glass, marking may need to be done slowly at high power to create high visibility.
White Marking by Removing Pre-Printed Surfaces
High-visibility marking is achieved by burning the printed surface (solid coating) using the laser. The high-contrast result allows for highly readable barcodes and other detailed marking.
CO2 laser markers that perform marking by applying heat to the target are optimal. Darker pre-printed surfaces allow for greater visibility. Marking for barcodes or other applications tend to take more time than regular character marking.
Marking on Unprinted White Paper
Marking is achieved using a high-power laser to burn the white surface of the target. When upgrading from stamping or other methods, there's no need to change the designs of cartons or other products, ensuring a smooth transition.
CO2 laser markers that perform marking by applying heat to the target are optimal. Residue may also be generated while marking, so a dust collector in addition to the laser marker may be required.
With zirconia ceramics, marking appears black as if the surface was burnt. With alumina ceramics, marking appears as if the surface has been melted.
Zirconia ceramics (marking using a fundamental wavelength laser marker)
Alumina ceramics (marking using a CO2 laser marker)
For zirconia ceramics, laser markers with the fundamental wavelength are optimal, and for alumina ceramics, CO2 laser markers are optimal. Take care when selecting the laser marker model, as the best choice will change depending on the ingredients of the target.
3-Axis Hybrid Laser Marker MD-X SeriesCatalog Download
Printed Circuit Boards
White marking is performed by engraving only the surface of the solder mask. The shallow engraving allows for clear marking without exposing the pattern.
Marking should be performed at low power, as soot will be generated if the marking power is too high. In addition, because the fundamental wavelength laser passes through solder masks, risking damage to the pattern, CO2 lasers are best.