Colour reproduction in dry offset printing for beverage cans: a study of conventional and variable processes

Abstract

In this research, we have examined the critical role of colour control in dry offset printing technology for beverage cans, emphasising its contribution to sustainable production. In the presented study, we have compared conventional and variable dry offset printing while maintaining identical manufacturing conditions, with a focus on the stability and precision of colour reproduction. Measurements conducted, ΔE2000, tone and gloss values, were obtained on a defined red colour reference patch. The first phase of the experiment involved printing without any prior colour management inputs. It resulted in inferior colorimetric values, underscoring the essential role of colour management, continuous measurement and process control. Through the second phase of the experiment, we have systematically monitored key colorimetric and surface parameters after the colour management procedure was applied. The results gained indicated that both printing methods are capable of maintaining colour reproduction within acceptable tolerance ranges, confirming their suitability for industrial applications. An interesting finding was that variable printing exhibited slightly greater uniformity in certain printed areas. Ink consumption was also assessed and remained within expected limits for both methods, reinforcing the principles of material efficiency and waste reduction. These findings demonstrate that stringent colour control directly supports sustainable production practices and indicate that variable printing represents a relevant and reliable alternative within the dry offset process. Future investigations should address more complex designs with higher technical demands and incorporate sampling of a broader range of colours, enabling a more precise characterization of the limitations and potential of this specific printing process through increased data quantity.