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The factors that influence the viscosity of solvent based gravure printing ink

                      The factors that influence the viscosity of solvent based gravure printing ink


The main factors that influence the viscosity of solvent based gravure printing ink is as below:
1.The viscosity of the fixed liquid resin. The higher viscosity of the resin has, the higher viscosity of the ink will be.
2.The fitness between pigment and resin. If pigment has coagulability reaction with resin, the ink viscosity will be high.
The compatibility and intermiscibility between dispersion and solvent. If dispersion can be attenuated by solvent at any percentage, then the ink system will have high viscosity.
Temperature. The lower temperature, the higher viscosity.
The low viscosity of solvent based gravure printing inks may cause the pinhole phenomenon, large area of color piece not plain or not smooth on the surface of printing. Also, it may make the printing breezing or appearing halo. When print the stuff with smooth surface, the ink adhesion is low, and when print the paper, it maybe pulverization or loosing ash.
The high viscosity of sovent based gravure printing ink may cause scratching, bit color, filling in or wave problems.
Use carbon black to produce screen printing offset printing ink.
Product introduction:
How carbon black influence the ink gloss. The ink gloss depends on the characteristic of the carbon black used in ink, the weight of dispersion, the dia of dispersion. If it is dispersed with high speed, evenly dispersed among the ink. The fine reach the original size. The fine it is, the higher gloss it will have. On the contrary, if the original size is big, or it is not dispersed evenly, the gloss will be low. Because the ink is a very thin film, the carton black in ink or the color carrier will osmosis into the surface, this allows the more primary structure to extrude the film. To compare with varnish ink, this phenomenon is more obviously. High structure will osmosis more deeply than low structure. In the best dispersion, the way pigment carbon black disperses is, surface dispersant continuous monolayer adsorption on the pigment carbon black aggregates. Therefore
Formation fluid dispersion amount of dispersant liquid required have relation to surface area. Under same condition, with same additive, the larger of the side of the specifi surface area, the more dispersion is needed. Granulous carbon black can be reserved, treated and transported easily than powdery carbon black. The granulous carbon black is not easy to fly, more clear and easy to treat and can cause less manager problems. Granulous carbon black is more cheaper than powdery carbon black. But the granulous carbon black is not easy to disperse and have high demand on machine. If the machine is not so advance to copper with the granulous carbon black, then, we have to use powdery carbon black.