Ink performance factors on spot color ink color difference

Suzhou screen printing ink, KUNshan PCB screen printing ink, PCB screen printing material suppliers

The final effect of printing and physical and chemical properties of ink is closely related to the composition of ink determines the nature of ink.

1. The size and dispersion of pigment particles

Although the function of capillary of ink film is an important factor to form the luster of printed matter, the apparent size of pigment particles in the dispersed state is more important, which directly determines the state of capillary of ink film. Therefore, pigment particles are small, good dispersion, conducive to the formation of smooth ink film, for improving the luster of printing is also very beneficial.

2. The viscosity of the connecting material and the content of pigment

According to the principle of interfacial chemistry, the capillary permeability rate is inversely related to the liquid viscosity, that is, the permeability rate decreases with the increase of the viscosity. The capillary network structure formed between ink pigment particles is an important part of the gloss of the printed matter. At the moment of embossing, the ink is pressed into the larger pores of the paper as a whole; After embossing, the connecting material begins to separate from the ink and seep into the smaller pores of the paper. Therefore, the size of the ink film capillary determines the separation of the connecting material. The effect of capillary retention of the bonding material is much greater than that of printing pressure pressing the bonding material into the pores of the paper.

3. The drying time

Rapid drying of ink film on paper can reduce the amount of connecting material into the pores of paper, thus improving the gloss and smoothness of ink film. The high gloss of the ink film means that the specular reflection of the surface is relatively high, so that the human eye in most cases can see the surface reflected white light is much less than the low gloss of the ink film, making the color saturation higher. So high gloss printing looks more colorful, full. Spot color ink printing ink layer is mostly translucent or opaque, in the selection of ink formula also according to the actual situation to consider the impact of light transmittance of ink layer on spot color printing