Principle of plasma surface treatment technology High frequency AC voltage is applied at both ends of the electrode, which makes the air between the two electrodesproduce gas glow discharge and form plasma area. Electrons collide with gas molecules continuously in motion, and a large number of new electrons are produced. When these electrons reach the anode,a variety of oxygen-containing groups are introduced, which makes the surface from non-polar and difficult to stick to certain polarity, easy to stick and hydrophilic, which is conducive to bonding, coating and printing.