CO2 laser cleaning of cross-linked polymer coating on metal mesh

The pollution caused by the chemical cleaning of polymer coatings when recycling printing screens can be allevi-ated through laser cleaning. The interaction mechanism between the laser beam and polymer coating is studied, a laser ablation threshold model of the cross-linked polymer is constructed, and principles of laser bonding and photoionization are discussed. When the laser energy density is 7.8 J/cm2, the laser pulse width and action energy influence the characterization after ablation. When the deposition energy is >1.2 J/cm2, the polymer material undergoes carbonization. When the deposition energy is <0.8 J/cm2, significant gasification and erosion are caused by the thermal decomposition of the resin. The findings provide a theoretical basis for research and reference for experiments and industrial applications.(c) 2022 Optica Publishing Group