An investigation of the relationship between percentage underneath area cover age and ink film trapping is presented. It is common knowledge that an ink generally adheres better to the paper than to a wet ink. This is known as undertrapping. To avoid this problem, printers set a limit for the total area coverage to be printed on the press sheet. The problem is that no formal study has been done to find the optimum point at which the limit should be set. The investigation addresses the issue of total area coverage from a trap ping point of view. This presents the behavior of ink trapping relative to differ ent combinations of underneath area coverage. A test target with area coverage from 15% to 300% was printed underneath a solid. Ink trapping of the solid over the different combinations of underneath area coverage was determined densitometrically. A plot of the relationship between ink trapping and under neath area coverage demonstrates that there is an inverse and linear relation ship between the two variables.
Library of Congress Subject Headings
Printing-ink; Paper--Printing properties; Color printing
Department, Program, or Center
School of Print Media (CIAS)
Garcia, Daniel, "An investigation of the relationship between percentage area coverage and ink film trapping" (1993). Thesis. Rochester Institute of Technology. Accessed from
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