A major problem in the printing of newsprint by flexography with water-based inks is the filling-in of halftones. Drying of the ink and rewettability, the ability of the fresh ink to wet the dried ink, appear to be primary in the understanding of the filling-in problems. Quantification and qualification of critical factors are essential in resolving this problem. In this study black water based flexographic news inks from different manufacturers were compared in terms of their drying and rewettability characteristics. The change in weight with time and contact angle measurements are the response parameters considered. Proper care has been exercised to maintain constancy of parameters while conducting the experiments. Four samples of black ink were analyzed in this study. The critical balance-weight differential-gravimetric method was adopted to determine the drying rates and the sessile drop method was used for finding the contact angle. This study has yielded information which will enable a better understanding of the drying properties of the inks. More important, the contact angle will serve as the determinant of the fresh ink's ability to wet the dry ink.
Library of Congress Subject Headings
Printing ink--Drying--Testing; Flexography; Printing ink--Testing
Department, Program, or Center
School of Print Media (CIAS)
Varadarajan, Parthasarathy, "To determine the drying rate and the rewettability characteristics of water based flexographic news inks" (1990). Thesis. Rochester Institute of Technology. Accessed from
RIT – Main Campus