Influence of pigment on water-based UV curing inks
All kinds of pigments have different absorption rate of light of different wavelengths (transmittance), the absorption rate of pigments is smaller, transmittance is larger, the curing speed of the coating is faster ultraviolet absorption capacity of carbon black is higher, curing is the slowest, white pigment is reflective, also hinder the curing of the general and uv absorption order is: Black>The same pigment ratio concentration is different, the influence of ink film curing rate is different with the increase of the amount of pigment, the curing rate of the ink film has a different process of decline among which the amount of yellow pigment has the greatest influence on the curing rate of the ink film, followed by red pigment green pigment When the amount of pigment is too large, the curing rate of the surface layer of the ink film is fast, but the pigment on the surface absorbs a lot of ULTRAVIOLET light, reduces the transmittance of ultraviolet light, affects the curing of the deep ink film, resulting in the curing of the surface layer of the ink film and the bottom layer is not curing, easy to produce wrinkling phenomenon.
read more