Working principle of plastic corona treatment machine

Working principle: Use high frequency and high voltage to conduct corona discharge on the treated plastic surface to generate low-temperature plasma, which causes free radical reaction on the plastic surface and cross-links the polymer. This process will destroy the molecular structure of the plastic surface, generate free radicals, and promote cross-linking of the polymer. At the same time, corona discharge will also increase the surface roughness of plastics and improve the wettability of polar solvents.

The working principle of the plastic corona treatment machine is to use high frequency and high voltage to conduct corona discharge on the surface of the treated plastic to generate low-temperature plasma and make the plastic Free radical reactions occur on the surface, causing the polymer to cross-link. This process will destroy the molecular structure of the plastic surface, generate free radicals, and promote cross-linking of the polymer. At the same time, corona discharge will also increase the surface roughness of plastics and improve the wettability of polar solvents. During the corona discharge process, a large amount of ozone is also produced. Ozone is a strong oxidant that can partially oxidize the molecular chains on the surface of polymers to generate carbon-based compounds, hydrogen-based compounds, and perhydrogen compounds.

The corona treatment machine is composed of three basic parts. The host part of the power processing realizes high-frequency high-power current output; the high-voltage and high-frequency transformer part realizes the voltage boosting function and outputs high-voltage and high-frequency pulse current; The discharge rack part realizes the discharge between the electrode and the roller, and performs corona treatment on the plastic film passing between the discharge electrode and the roller.

Corona treatment can not only improve the coating adhesion of plastic surfaces and solve adhesion problems caused by printing polypropylene or polyethylene films, but also remove oil, water vapor and dirt.

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