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FLEXO Magazine : September 2014
TVI CONCLUSIONS The LED UV curing system delivered the lowest TVI from 2 percent to 100 percent and the conventional UV curing system deliv- ered the highest TVI across the same range. No final conclusions can be made about the black print samples from this test, due to a lack of consistency in the data. The most consistently accurate dot was LED cured on paper and film. LED curing systems are able to consistently reproduce dots closest to the value of the dot in the file. Printers can adjust their dot gain compensation curves with more confidence when the actual dot reproduction remains consistent throughout the printrun. In conclusion, LED curing systems provide benefits in terms of consistency of print density that conventional UV curing systems do not provide. COLOR GAMUT Color gamut is the range of all colors that can be reproduced in print from the color spectrum with a given set of ink and press conditions. Every printing technology produces a different color gamut based on what colors it can achieve with a given ink set, substrate, ink metering, plate, press speed, etc. The L*a*b* values of 100 percent CMYK samples were measured and averaged for overprint colors in order to approximate a color gamut for every pressrun. Averages of the CMYK samples gave insight into the range of color achieved on press under each set of conditions. Two ink systems were compared to de- termine if differences in ink gamut result from ink formulation, and specifically the photoinitiators used in the ink’s vehicle. A comparison of the color gamuts from the two different curing systems was done for each of the runs of film and paper at both high and low speeds. Based on the graphed L*a*b* values, there is a noticeable differ- ence in color on the film substrate, which is to be expected due to the greater ink holdout on film. Data collected shows that conventional UV curing methods were able to achieve a wider color gamut when com- www.flexography.org/fpp BEFORE YOU CAN CONTROL IT USING ... YOU HAVE TO UNDERSTAND IT. Order your copy today. FTA Members: $130 List: $260 Kindle: $99 SEPTEMBER 2014 | FLEXO 67 ABOOKSHE LF ESSENT I A L F OREVERY FL EXOGRAPHER :