Editor's note : Ink is one of the main materials for printing. It brings people a colorful world through the selective absorption of light. Ink is a stable colloidal dispersion system consisting mainly of pigments, binders and various additives. The printing suitability of ink has always been the object of concern in the printing industry. Its quality directly affects the printing process and the quality of printed products. A typical aspect of ink printability is the viscosity of the ink.
From this, we know that ink technology has a great influence on printing. The ink drying process in the printing process has been mentioned on this website. It also explains the relationship between ink and printing. This issue will be used again to discuss the ink viscosity problem and solution through printing quality for reference.
â– understand the ink viscosity Concept: The ink viscosity is the physical quantity used to measure the ink viscosity. Usually the ink is dispersed by fine pigment particles in the binder to form a colloidal dispersion system. In the interior of the system, due to the intermolecular forces, there is cohesion between them. When the ink flows under external force, the system will produce a resistance, which we call internal friction. The internal friction exhibited by the ink in the flow is the viscosity of the ink. The ink viscosity does not make much sense on its own, but as an important indicator of the rheological properties of an ink, it reflects the printability of the ink from one aspect.
Form of expression: Viscosity is usually divided into Newtonian viscosity, plastic viscosity, apparent viscosity, differential viscosity, etc. They are not comparable to each other, but as an important indicator of ink rheological properties, they are comparable in the same expression method. . The viscosity of the same type of expression means that the fluidity is small when it is large and the fluidity is large when it is small. In practical applications, a viscometer is generally used to detect the ink's plastic viscosity.
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