How to measure water-based gravure printing ink - ink, water-based gravure - printing industry

While maintaining the same as solvent-based inks Print Based on the quality of a

good water-based gravure printing ink must be zero VOC emissions; must have good printability; to various substrates in the surface of printed materials; also hope that the cost of printing ink low. Using water-based gravure printing ink will have to change the gravure roll, such as sculpture, to change the printing operation, printer maintenance, dryer replacement and other issues. Similarly, the substrate material will strongly affect the results of printing ink, especially for low surface tension substrates such as Plastic Thin films and coating the surface of the printed paper. For the non-coated paper, ink and even may lead to deformation and curling of paper, these issues are solvent-based intaglio ink is non-existent. PH value of water-based gravure printing ink the importance of: More water-based gravure printing ink and solvent base, doctor blade in gravure printing ink from the hole in the scrape off the excess ink process, the use of solvent-based gravure printing ink process to minimize solvent evaporation, In the imprinting process is completed, ink was transferred to the substrate material, and then slowly forming ink film, in the process of solvent ink ink film adhesion must be completed before the evaporation process, quickly reached the dry ink film. In the water-based ink, the organic solvent is a certain percentage of water, cosolvent, and replaced with a volatile amine, such volatile amine and acid to the resin are necessary. As the water slowly volatile, so there is no ink in the printed version of the volatile dry hole and written questions, but there are dry after printing problems, so the choice of the ink in the amine, for PH value adjustment and the ink viscosity control as important. Imprinting process is complete because premature release of the former amine solvent will lead to a decline in PH values, causing resin dwell in the gravure roller drying hole. In addition, the water and cosolvent system can not be re-dissolved resins, and solvent-based ink that different. PH value so any decline in the possibility of re-dissolution is not possible. In gravure, we should be very careful to control the PH value, because the decline in the value of ink PH dwell hole lead was slowly blocked until completely blocked, this is a very serious problem, will result in the printing operation can not continue. Water-based gravure printing ink surface tension of the importance of: The same time the surface tension of ink is also an unavoidable factor, that is completely different from the solvent-based inks. Compared with solvent-based ink, ink surface tension is much higher; and high surface tension will result in ink can not be a good substrate wetting and the gravure roller surface dwell hole, which will not result in the printing ink film uniform; as ink surface tension, the ink film substrate surface in the state of contraction, resulting ink film showed obvious mesh, can lead to ink not even dwell hole from the transfer to the substrate surface. But the surface tension is reduced, it is necessary to carefully select the proper surfactant, or a small amount of alcohol. Despite the development of printing ink to pay a huge labor, but to maintain the quality of the printing ink when printing (as solvent-based ink as the printing quality), complete reduction in VOC ink in the gravure emissions remains a difficult challenge.

How to measure water-based gravure printing ink - ink, water-based gravure - printing industry

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