白色水性油墨分散性与遮盖力研究

在印刷中,白色油墨通常作为打底油墨,白墨的遮盖力对表层图文再现起着关键性作用。油墨分散性是影响其遮盖力的重要因素之一。为了探讨油墨分散性与遮盖力的关系,通过改变油墨制备工艺,制备分散性不同的白色水性油墨样品。测试油墨的粒径大小及其分散状态,将油墨涂布在遮盖力测试纸上,测试遮盖力以及墨膜表面形貌,分析白色水性油墨分散性对遮盖力的影响。实验结果表明：分散性好的油墨颜料颗粒分散均匀,没有团聚现象,遮盖力好;反之较差。

Studies on the Relations between Dispersivity and Covering Property of White Water-based Ink

The white ink commonly serves as render ink in printing, and it＇s covering property （CP） , which is assumed to be influenced by the dispersion, plays a key role in color reproduction on the film surface. In order to research on the relations between dispersivity and CP, inks with different dispersion are prepared by changing the preparation process. The ink＇s particle size and distribution are tested before it is coated onto the surface of covering property test paper. The morphologies of inks film are studied through SEM to examine the white ink＇s dispersion and its influence on CP. The result shows that well dispersed inks have fine particle size and tend to uniformly distribute. There is hardly any agglomeration found on the well dispersed ink＇s SEM image which is supposed to account for its high CP. By contrast, inks with poor dispersion scatter unevenly and large agglomerations are observable on its SEM image, their dispersion state and ag- glomerations lead to its poor performance of CP.