Abstract

This paper will compare two process-less offset plates for their imaging and on-press behavior. Several tests will be performed to evaluate the difference between the two plates. One plate is supposed to replace the other. The newer processless plate promises that the dot can be read directly on the plate after imaging. This will be tested as well.

Imaging and press parameters will remain the same for this project to understand better that the newer processless plate can be exchanged directly without any modifications to the current workflow. The test will be carried out on the same coated paper with the same inks. The older set of plates will be used to establish proper printing conditions and printed solid ink densities. Once this has been done, the plates will be changed. After printing, approximately 500 sheets test sheets will be pulled from delivery and evaluated for the parameters listed below.

A test form will be created to measure the following parameters: printed solid ink density, tone values, tone value increases, print contrast, reproduction capabilities of fine lines regular and reverse, small type reproduction capabilities regular and reverse, and color gamut. It is expected that there will be minimal differences in print quality between the two processless plates.