The final effect of the printed matter is closely related to the physical and chemical properties of the ink. The composition of the ink determines the nature of the ink:
1. Pigment particle size and degree of dispersion
Although the role of the ink film capillary is an important factor in forming the gloss of the printed product, the apparent size of the pigment particles in the dispersed state is more important, and it directly determines the state of the ink film capillary. Therefore, the pigment particles are small and well dispersed, which is conducive to the formation of a smooth ink film and is also very beneficial to improve the gloss of the printed product.
2. Viscosity of binder and content of pigment
According to the principle of interface chemistry, the capillary penetration rate is inversely related to the viscosity of the liquid, that is, the penetration rate decreases as the viscosity increases. The capillary network structure formed between the ink pigment particles is an important aspect that determines the gloss of the printed matter. At the moment of imprinting, the ink is pressed into the larger pores of the paper as a whole; after imprinting, the connecting material starts to separate from the ink and penetrate into the smaller pores of the paper. Therefore, the size of the ink film capillary determines the amount of separation of the connecting material. The capillary retains the connecting material much more than the printing pressure presses the connecting material into the paper pores.
3. Drying time
The rapid drying of the ink film on the paper surface can reduce the amount of the connection material penetrating into the paper pores, thereby improving the gloss and smoothness of the ink film. The high gloss of the ink film means that the surface has a relatively high degree of specular reflection, so that in most cases, the human eye can see that the white light reflected by the surface is much less than the ink film with low gloss, which makes the color saturation more high. Therefore, the printed products with high gloss look more colorful and full. The printing ink layer of spot color ink is mostly translucent or opaque. When selecting the ink formulation, the influence of the transparency of the ink layer on the spot color printing should also be considered according to the actual situation.
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