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FLEXO Magazine : July 2013
in a DE00 of 1.36, and a measurement under M1 (D50) and M2 (UV-Cut) resulted in a measurement of 6.43. Measurement of the unprinted Tango Coated Cover C1S under M0 (Illuminant A) and D65 yielded a DE00 of 3.29. Furthermore, a measurement under M0 (Illuminant A) and M1 (D50) resulted in a DE00 of 1.35, and a measurement under M1 (D50) and M2 (UV-Cut) resulted in a measurement of 6.41. Table 1 (page 32) shows the measurement results from both of the substrates. In both substrates it is clear that the 10 per- cent tint patches had the largest DE. The DE diminishes as the halftone dot percentage becomes larger. This signifies that the unprinted substrate plays a large role in color difference. Figures 3, 4 and 5 show the influence of the DE00 of each color under different measurement conditions. Figures 2 and 4 show that there was not a significant difference between the varying measurement conditions for PMS 374 and PMS 281 on the solid color patches. However, it is worth noting that there was still a significant amount of difference between the varying measurement conditions on the solid color patch for PMS 299. This is perhaps due to the lighter color of the ink, which is more transparent and allows for more of the sub- strate to be reflected through. As the tint percentages shrink, the DE grows for all measurement conditions. The DE of M1 and M2 are the greatest overall, which is to be expected as 0 1 2 3 4 5 6 7 0% 10% 50% 75% 100% DE A-D65 DE A-D50 DE D50-UV Cut 0 1 2 3 4 5 6 7 0% 10% 50% 75% 100% DE00 DE00 Tint % Tint % Crescendo C1S Tango C1S Figure 4: DE00 of PMS 299 under varying measurement conditions. DE00 DE00 Tint % Tint % 0 1 2 3 4 5 6 7 0% 10% 50% 75% 100% DE A-D65 DE A-D50 DE D50-UV Cut 0 1 2 3 4 5 6 7 0% 10% 50% 75% 100% Crescendo C1S Tango C1S Figure 5: DE00 of PMS 281 under varying measurement conditions. 34 FLEXO JULY 2013 www.flexography.org