The fourth of a four-part series on special decorative effects, this article focuses on new technologies for achieving high contrast and color laser marking at unprecedented speed. The newest generation of material science and laser hardware/software technology is driving demand for laser marking to replace conventional ink printing methods. Numerous articles have been written about the virtues of laser marking and the equipment mechanics. This article presents a total solution approach for achieving Six Sigma results.
Polymers that can be marked by laser are those that absorb laser light and convert it from light energy to thermal energy. Since most polymers do not possess absorption properties at 1064 nm, experts utilize additives and fillers that enhance the absorption of laser energy localized color change (pyrolization). The material science chemistry for achieving high contrast and color laser marking is both art and science. Contrary to popular belief, a single laser additive that solves all marking problems does not exist.