The influence of pigments on the suitability of ink printing mainly depends on the properties of pigment dispersion, hiding power, apparent volume ratio, oil absorption, etc. This article analyzes one by one. 1. Dispersion The degree of dispersion refers to the size of the pigment particles. The pigment particles in the ink must be completely immersed in the binder in the ink film. The size of the pigment particles cannot exceed the thickness of the ink film, otherwise it will affect the gloss of the printed matter. The smaller the particles, the higher the dispersion and the saturation of the ink. The bigger. Gravure printing is a hole transfer printing, which requires high pigment dispersion. 2. Coloring power Coloring power refers to the ability of a certain pigment to influence the color of the mixed pigment after being mixed with other pigments. Pigments that are easy to lighten when mixed with white substances have weak coloring power. When formulating inks, pigments with strong coloring power should be selected for printing to achieve the effect of less ink consumption and quick drying. This is very important for high-speed gravure printing, which requires high ink drying properties. 3. Hiding power Hiding power refers to the ability of pigment to cover the background color. Whether the ink has hiding power depends on the ratio of the refractive index of the pigment to the refractive index of the binder. When the ratio is 1, the pigment is transparent; when the ratio is greater than 1, the pigment is opaque, that is, it has hiding power. Different printing products have different requirements for the hiding power of pigments. For example, iron printing inks require strong hiding power of pigments to prevent the background color from being exposed, while four-color overprinting inks require high transparency of the pigments, so that the inks that overlap To achieve a better color reduction effect. 4. Apparent volume Apparent volume refers to the volume occupied by pigment per kilogram, expressed in cubic centimeters. The same pigment with different particles has different apparent specific volume. The larger the apparent specific volume of the pigment, the smaller its specific gravity, and it is not easy to precipitate in the binder, and the stability of the ink is good. 5. Oil absorption Oil absorption refers to the amount of oil that can be absorbed by a certain amount of pigment, calculated as grams of linseed oil required for 100g of pigment to stick together. The nature of the printing ink is related to the oil absorption of the pigment. The ink made of a pigment with a small oil absorption contains more pigment. The ink has strong hiding power but poor stability. Blocking easily occurs during printing, and it is also easily emulsified. Generally, the amount of pigment oil absorption is large.
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