The working principle of protective film corona treatment

I have introduced to you that the wholesale products of polymer protective film will undergo corona treatment, which can change the surface energy of the protective film and make it easy to bond with printing inks, coating materials and adhesives. So what is the working principle of this protective film corona treatment? In fact, the principle is to use high-frequency and high-voltage corona discharge (high-frequency AC voltage as high as 5000-15000V/m2) on the surface of the processed plastic to generate low-temperature plasma, which causes radical reactions on the plastic surface to cause polymer generation Cross-linked. The surface becomes rough and increases its wetting memory to polar solvents. These ionic bodies break their molecular structure by electric shock and penetration into the surface of the printed body, and then oxidize and polarize the molecules on the surface to be treated, and the ion shock corrodes the surface. So as to increase the adhesion of the surface of the substrate.　　 After corona treatment, the cross-linked structure of the plastic surface layer of the polymer protective film is less than the cross-linked structure of the inner layer, so the function of the surface layer has higher mobility. Next: What are the commonly used processing materials for heat shrinkable film? Previous: What are the characteristics of PE heat shrinkable film