The Examination of the Changes Occurred on Offset Printing Roller and its Effects on Density

Abstract

The quality and use of inking and dampening rollers on the printing press is one of the important factors that affect the printing quality and production performance. The aim of this study is to determine the roughness, diameter and hardness changes on the surface of offset printing rollers while operating time and indicate the effect of roller wearing on printing quality. With this aim, the changes, up to 750.000 unit printing samples per hundrend thousand, after 750.000 unit printing samples one per one million, occured on roller surface were examined. Also density measurement was done to determine the printing quality which affected by change on the roller surface. Then the density results obtained from printing samples and and surface roughness values were analysed by using Minitab data analysis programme. At this study, it was tried to determine the ideal roller surface properties which provides the most suitable results for printings