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

Abstract

The pollution caused by the chemical cleaning of polymer coatings when recycling printing screens can be alleviated 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 7.8J/cm2, the laser pulse width and action energy influence the characterization after ablation. When the deposition energy is >1.2J/cm2, the polymer material undergoes carbonization. When the deposition energy is <0.8J/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.