The effect of drying behavior of coatings containing starch, synthetic silicate pigment and CaCl2 on inkjet print quality was studied. It is known, that print quality is dependent on the ink-substrate interaction, absorption behavior of the substrate and colloidal stability behavior of the ink at the substrate interface. One efficient way of improving the fixation of anionic inkjet pigment colorants is by controlling the electrostatic interaction and colloidal stability by using e.g. divalent or multivalent metal salts. In this study, we have investigated the effect of end moisture content of coating containing hydroxypropylated-starch, synthetic silicate and divalent metal salt (CaCl2) on inkjet print quality of pigment-based ink. It was seen that significant differences in print density could be obtained when using different drying strategies. The obtained effects on substrate-ink interactions were ascribed to changes in coating structure and migration of CaCl2 and better film forming caused by the more intense drying process.
Mielonen Katriina, Ovaska Sami-Seppo, Lyytikäinen Johanna, Johansson Leena-Sisko, Sterberg Monika, Backfolk Kaj, "The effect of drying behavior of coatings containing pigment and CaCl2 on inkjet print quality" in Proc. IS&T Printing for Fabrication: Int'l Conf. on Digital Printing Technologies (NIP33), 2017, pp 37 - 41, https://doi.org/10.2352/ISSN.2169-4451.2017.33.37