Method of adjusting dampening-solution feed in an offset printing press

摘要

A method of adjusting dampening-solution feed of an offset printing press by a control device includes determining a required dampening-solution demand for a first calibration printing form with a known minimum percent area coverage and for a second calibration printing form with a known maximum percent area coverage at a calibration speed, and storing the dampening-solution demand in the control device as interpolation reference points; determining a percent area coverage lying between the maximum and the minimum percent area coverage of the calibration printing forms of a printing form to be used for a forthcoming print job, and passing the determined percent area coverage on to the control device; determining by the control device the dampening-solution demand required for the forthcoming print job with the printing form provided for the purpose at the calibration speed, by interpolating between the interpolation reference points; determining a printing-speed dependent characteristic curve of the dampening-solution demand required for the forthcoming print job with the printing form provided for the purpose; and controlling, during the processing of the print job, the feed of the dampening solution along the characteristic curve.