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Studies on the Controllability of Inking in Lithographic Printing Presses

机译：平版印刷机上墨的可控性研究

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The object of study was whether the lithographic printing process in a conventional offset printing machine could be put under closed-loop control in order to control and stabilize the density of the print. Two kinds of measurement devices were developed: single- and 16-channel versions were constructed to measure the ink-film thickness under the duct roller before the vibrator roller during printing using capacitive transducers. The second type of instrument was on-press densitometer: a four-channel and a 16-channel version. Using this instrumentation and commercially available instruments, effects of the process state variables on the print density were studied, in steady-state conditions and, to some extent, under dynamic conditions. The test printings were carried out on web-fed and sheet-fed presses, printing on both coated and newsprint papers. The density variations were evaluated as variations from revolution to revolution and as variations across the press.

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