HN919 Friction Electrostatic Plastic Coating Gun

Usually, the surface treated with friction plastic coating is smoother and cleaner than that of high-pressure electrostatic plastic coating. And there is no common “orange peel effect” when high-pressure plastic coating is used. This is partly due to the fact that after the friction plastic passes through the friction gun, the size of the plastic is relatively uniform (see the previous section). The most important reason is that the friction coating plastic will not produce electrostatic repulsion due to accumulation on the workpiece, thus overcoming the resulting “orange peel effect”. The “orange peel effect” caused by electrostatic repulsion of plastic usually occurs when:

• Excessive plastic. When too thick plastic particles are piled on the surface of the workpiece, the outer particles cannot be sufficiently grounded, resulting in mutual repulsion. And it will repulse the plastic particles that continue to be coated to the workpiece, thus affecting the plastic coating efficiency and surface quality. On the surface of the workpiece, there may be uneven and even foaming surface.
• Excessive plastic may also cause a small gap between the coating and the surface of the workpiece, resulting in an “orange peel” phenomenon.
• Too high high-voltage electrostatic voltage. “Orange peel ” phenomenon can also be caused when the high voltage electrostatic voltage applied to the plastic is too high. This phenomenon can be avoided when friction plastic coating guns are used.
• Imperfect leveling and coating process. Due to the uneven temperature distribution in the plastic coating oven, the temperature rise of the workpiece is not complete.