With the development of plastic decoration technology, a metallized decorative technology for plastic products is produced. It is coated with a plastic substrate and then coated with a metal film layer by vacuum plating or sputtering. Made. The surface of the painted plastic is completely shiny with metallic luster, showing the noble and magnificent metal quality. It is impossible to see plastic products. The metallization of plastic can not only save a lot of precious metal materials, but also greatly reduce the quality of products. In recent years, in the manufacture of cosmetic bottles and packaging boxes, automobile lamps, bottle caps, plastic buttons for mobile phones, watch cases, etc. Widely recognized and applied.

1.2 Vacuum coating editing

Vacuum coating technology refers to the deposition of a metal or metal compound into the surface of a material (usually non-metal) in a vacuum environment. It is a physical vapor deposition process because the coating is often a thin film of aluminum, tin, indium, etc. Therefore, it is also called vacuum metallization.

The function of the vacuum coating is mainly to give the surface of the plated part a high metallic luster and mirror effect, especially in the lamp cover, and then to give the coating layer excellent barrier properties, providing excellent electromagnetic shielding and electrical conduction. effect.

The vacuum coating is divided into two processes: thermal evaporation coating and magnetron sputtering coating according to the manner in which the vapor phase metal is formed and the deposition method. Among them, the magnetron sputtering method has the advantages of strong bonding force between the coating layer and the substrate, and the coating layer is dense and uniform, and has a technical advantage.

Vacuum coating materials are mainly composed of metals and metal oxides. Metal-type coating materials are aluminum, tin, indium, cobalt, nickel, copper, zinc, silver, gold, titanium, chromium, molybdenum, tungsten, etc.; alloy-type coating materials are nickel-chromium, nickel-iron, iron-cobalt, gold - silver-gold or the like; the metal compound is silica, titania, tin dioxide or the like. Among them, aluminum is the most common application. This is mainly because the aluminum evaporation temperature is low, easy to operate, the aluminum plating layer has good adhesion to plastics, has strong ultraviolet and gas barrier properties, and is inexpensive.