Method and device for regulating the proportions of ink and damping medium in a layer of emulsion on the printing plate of an offset printing machine

摘要

The invention relates to a method and a device for regulating the proportions of ink and damping medium in a layer of emulsion 19 on the printing plate or the plate cylinder 3 of an offset printing machine, in which two remission signals of different wavelength running through the layer of emulsion 19 are received in the infrared range, as a result of which the one signal is influenced primarily by the proportion of ink and the other signal is influenced primarily by the proportion of damping medium. The signals thus obtained are used directly, or after a calibration operation, as a pure proportion of ink or as a pure proportion of damping medium to control the ink ductor or the damping-medium ductor. <IMAGE>