Why must first spray UV primer and then do PVD?
IKS PVD,plastic vacuum coating system,firstname.lastname@example.org
1, increase the coating and plastic substrate surface adhesion primer UV coating on the plastic substrate has a good adhesion.
The active thinner in the primer UV coating has a strong erosion ability to the plastic substrate, the active thinner will be slightly swelling or softening the plastic substrate, so that the coating curing in the primer UV and the formation of interpenetrating network between the substrate surface, can improve the adhesion of the whole coating coating
If the vacuum coating directly on the surface of the plastic substrate, and do not do the primer UV spraying, because the metal coating lack of erosion of the plastic substrate, will lead to poor adhesion coating and plastic substrate.
2, close the residues in the substrate, ensure the quality of coating
Through UV coating to close the substrate plasticizer residues, corrosive gas residues and mold release agent lubricant and other grease molecules residues, prevent the vacuum coating or the workpiece in the process of using these volatile impurities overflow, affect the quality of coating.
The release of volatile impurities in the substrate will make the aluminized film become colorful, discolored, oxidized and blackening, which will affect the metal texture and appearance of vacuum electroplating.
3, improve the substrate surface smoothness, ensure the effect of mirror coating
In general, the plastic surface itself has a roughness of about 0.51nm, the thickness of the vacuum coating does not exceed 0.2 m, can not fill the substrate surface uneven, not the ideal mirror reflection effect. The primer UV coating thickness is generally up to 10-20 m, the surface flatness of 0.1 m or less, coating UV primer can fill the surface defects of plastic substrate and get the ideal vacuum coating metal luster effect.