X.X –Post-Print Laser Marking: a solution to the challenge of 100 % calcium carbonate coating when using CO2 lasers, PaperCon 2016

Laser marking is a widely used technique to form individualised identification, such as product numbering or 2D coding. The technique is based on ink removal via laser ablation, which requires local heating with a laser beam, i.e. the coating layer must absorb at the particular wavelength of the laser to provide the heat to vaporise the ink layer. Calcium carbonate shows a very low absorption at the wavelength peaks of the typical CO₂ lasers used, which has led to the need to incorporate a threshold amount of other minerals, however generally at the cost of losing natural brightness. Post application of an ultrathin nanoclay or nanosilica layer onto a high brightness calcium carbonate coating is shown to support laser ablation of offset ink with all the standard laser wavelengths, without compromising the optical appearance.  

TAPPI conference proceedings and presentations, technical papers, and publication articles provide technical and management data and solutions on topics covering the Pulp, Paper, Tissue, Corrugated Packaging, Flexible Packaging, Nanotechnology and Converting Industries.

Simply select the quantity, add to your cart and your conference paper, presentation or article will be available for immediate download.