⑴ save manpower. Spinning cup put into operation, can save a lot of manpower, the spray coating line is basically enabling unmanned operation. Surface when the electrostatic field intensity is large enough to enable the spray gun head toward the sharp edge of the electron emitting parts, under the action of high voltage electric field, the electron kinetic energy is large, high-speed impact air molecules, ionized air molecules, electrons and positive ions generated is accelerating electric field, and the movement toward the poles, respectively, and then hit other air molecules to ionize to form an electron avalanche process, the image appears discharge air ionization, can be seen in the dark mist halo, called the corona phenomenon. Using spin coating Cup effect: paint spraying line just arrange basecoat and clearcoat coating the inner surface of staff can be. ⑵ uniform thickness, quality and stability. Spinning cup body to improve the decorative appearance is evident. ⑶ saving coatings. Hand air spray coating efficiency of 30% to 40%, and bell spray efficiency is generally more than 80%. In the painting, for example, manually operated car paint consumption is 1.8 kg, while the spinning cup spray cycling consumption 1.2 kg, each car can save 30% of the paint.