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At the present time, UV inks offer many advantages compared to conventional
solvent based inks. It remains that UV inks have to meet a lot of applicative
criteria. Primarily, an ink has to exhibit the right colour strength and the right
rheology (good flow for instance). These two parameters are interrelated.
Moreover, inks must be solvent/stain resistant, and have good printability... The
objective of this study is to better understand pigment dispersion through a UV
vehicle in order to better control the rheology of the ink and its colour strength.
Due to the fact that UV inks for lithography, flexography and screen process are
similar in composition, we try to define guidelines for ink formulation.
Advantages of an optimized pigment dispersion are the possibility to have a
greater flexibility of formulation or to apply thinner films with the same colour
strength.
In this study, we will present the main parameters that influence pigment
dispersion, some guidelines to obtain a good pigment dispersion and finally how
rheology measurements can help to better understand flow / colour strength
behaviours of inks and concentrates.
