Why should the primer be UV sprayed before vacuum coating the plastic substrate?
3, improve the surface smoothness of the substrate, to ensure the effect of mirror coating
Generally speaking, the plastic surface itself has a roughness of about 0.51nm, and the thickness of the vacuum coating film is not more than 0.2μm. It can not fill the uneven surface of the substrate, and can not get the ideal mirror reflection effect. The thickness of the primer UV coating is generally 10-20μm, and the surface flatness is below 0.1μm. After coating the UV primer, the defects on the surface of the plastic substrate can be filled up and the ideal vacuum coating metallic luster effect can be obtained.
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