What do you mean by spraying, screen printing and electroplating? How come?

Spraying is the use of compressed air to spray pigment powder in a mist, so that it is evenly distributed on the surface of the workpiece. The sprayed pigment can be liquid paint (also known as spray painting) or solid plastic powder (also known as plastic spraying).

Screen printing, full name is screen printing. Screen printing is to stretch silk fabric, synthetic fiber fabric or metal screen on a screen frame, and make a screen printing plate by hand carving paint film or photochemical plate making. Modern screen printing technology is to make a screen printing plate by photographic plate making with photosensitive materials (making the screen holes in the graphic part of the screen printing plate as through holes, but not blocking the screen holes in the graphic part). When printing, the ink is squeezed by the scraper and transferred to the substrate through the mesh of the graphic part to form the same graphic as the original.

Electroplating is a process of plating a thin layer of other metals or alloys on the surface of some metals by using electrochemical principle. During electroplating, the plated metal is used as an anode, which is oxidized into cations and enters the electroplating solution; The metal product to be plated is used as a cathode, and the cations of the plated metal are reduced on the metal surface to form a coating. In order to eliminate the interference of other cations and make the coating uniform and firm, it is necessary to use a solution containing metal cations in the coating as electroplating solution to keep the concentration of metal cations in the coating unchanged.