This study discusses the response time of different inking changes. In press control, when the pressman notices a color variation on the press sheet, he/she needs to adjust the ink keys to bring the color back to the color on the OK sheet . The change of the ink level needs a particular time interval to reach a new equilibrium. When a process reaches a new press equilibrium, it reflects the ink change factor. This study investigates the time interval by applying two amounts of inking change and two kinds of measurement by X-Bar R chart analysis. The response times for this study were calculated by X-bar R chart analysis with density and spectrophotometry L*, a*, b*, and C* data. After the experiment, two main conclusions are : 1) There is a significant difference in response time for large and small inking change assignments. 2) There is a significant difference between density and spectrophotometry measurement in calculating response time . The response time is about 60-85 seconds at 1200 FPM on the Harris M1000B press. There are some important findings in this research. First, a small inking change requires a longer response time than a large inking change. Second, The printing image dot area influences the response time greatly; in this study halftone dot areas require a longer response time than solid areas .

Library of Congress Subject Headings

Web printing presses; Offset printing; Printing ink

Publication Date


Document Type


Department, Program, or Center

School of Print Media (CIAS)


Cost, Frank


Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works. Physical copy available through RIT's The Wallace Library at: Z252.5.O5C398 1992


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