Main benefits of expanded gamut printing system proven in practice

Better changeover times, waste reduction, ink savings, reduced washups,and higher quality printing. These are just some of the main advantages that expandedgamut (EG) printing system offers compared to direct colour printing. Main key benefits that wereshowed during the technical day that Apex, Esko, Sun Chemical, Dupont, Cauchos Puntes andComexi organised all together at Manel Xifra Boada Technological Centre last March.

A total of ten experts from six different partner companies joined in a practical session thatconsisted of printing a set of planned jobs in continuous simulating a work shift. All these jobswere originally printed in spot colours but for this exercise they were converted into expandedgamut (multicolour) colour separation. Previously the Comexi F2 MP was characterized underagreed parameters of anilox, inks, plate and tape. The target of this exercise was to print in anefficient way and under a fixed quality standards, monitoring step by step relevant specific datain terms of job cost: changeover time, waste material and ink and solvent consumption.

Through these analyses and evaluations, technical specialists have been able to verify that theexpanded gamut system increases efficiency and achieves higher profitability and better qualitypackaging than multicolour system. It offers solvent savings since EG printing only needs sevencolours and, therefore, there is no need for wash-up in between jobs. This printing system reducesset-up times and enables to run more jobs, increasing machine uptime and capacity.

As a summary, the more relevant data were a reduction of 60% changeover time, a reduction of50% of waste material and decrease of 20% in inks cost.Besides, during the technical day, the experts confirmed that expanded gamut allows to run manyshades of different colours at the same time, which results in a reduction of the number ofchangeovers per day, increasing even more the press up time.Moreover, with this eco-friendly printing system it is no longer needed to use the press as inkproofer. By converting spot colours to a fixed ink set, colour matching is done during the prepress.

Again, it reduces downtimes between jobs and increases productivity. “Demand for shorterpackaging production runs for targeted campaigns and product variations is increasing. Printersand converters need to meet these challenges in a time and cost-effective way and EG systemis the proper way to achieve it”, explains Comexi Technological Centre Manager, Albert López.