Vacuum system problem of evaporation coating machine
If the vacuum system of the PVD evaporation coating machine does not meet the vacuum requirements or can not be pumped, you can first check the working status of the air extraction device, and then check whether the air release source exists. Before assembling the vacuum components, they must undergo strict cleaning, drying and leak detection. They can be used only after they are qualified. Then check the clean state of the sealing ring of the detachable part, the scratch of the sealing surface, the tight connection problem, etc.
Vacuum evaporation is to heat the raw material to be formed into a thin film in a vacuum chamber to vaporize atoms or molecules from the surface to form a vapor stream and enter the solid (called substrate or substrate) surface to condense to form a solid thin film. Regarding the shape of the evaporation source, according to the nature of the evaporation material, combined with the wettability of the evaporation material, it can be made into different forms and selected different evaporation source materials.
There are three layers of vacuum evaporation: primer layer (6~12um) + coating layer (1~2um) + top coating layer (10um). Wipe impurities and dust on the substrate surface with a cloth to improve the spray yield. Assemble the base material on a special hanger to fix it on the assembly line, and realize the appearance and function of the mask according to the design requirements. Since the substrate is a plastic part, air bubbles and organic gases will remain during injection molding. The surface of the plastic is not smooth enough, and the direct evaporation is poorly absorbed and not smooth. Applying a primer will improve the adhesion of the coating and the surface will be smooth and smooth . The pendant is assembled in a vacuum container and heated to realize evaporation.
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