The nemesis of not being able to print and not sticking firmly--corona treatment machine, provide a new solution for the pre-printing treatment of plastic films. Unique pulse density modulation (Pulse Density Modulation) control strategy series resonant inverter design, the basic idea of PDM is to generate square wave voltage or zero-level voltage at the AC output terminal within a certain power adjustment cycle, so that even if the corona The discharge load has a strong non-linearity and can control the power output in a wide range, which plays the role of phase locking, switch softening and power regulation. With the perfect multi-channel protection circuit, the entire corona processor works more reliably and stably. Applicable materials: Various plastic films, plates, aluminum foil, aluminized film (such as: PP, PE, PET, OPP, PS, ABS, etc.), paper and fiber materials.