How are black and white spots formed on decorative films?

1. The black spot is mainly the workpiece in the clean and then by the dirty spots attached to the surface, such as: wipe the residue, turnover process of the dust, hanging, furnace plate, heating tube and other collapsed deposits fall on the product, due to the extraction of the furnace fly ash falling on the workpiece and other pollutants. These contamination points will not form a film on the coating for the dark-colored bumps, some wipe off to reveal the substrate. 2.

2. White spots are pollutants attached to the workpiece, which naturally crumble away after the coating is finished and show up as white spots.

IP black film white point phenomenon is the most prominent, the more black color white point more, because the contamination point where the coating is not firm, the greater the stress on the film layer is more likely to become white point off the film.