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
Department, Program, or Center
School of Print Media (CIAS)
Chung, Shiuh-Dong, "An investigation of inking adjustments versus their response time in a web offset press" (1992). Thesis. Rochester Institute of Technology. Accessed from
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