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FLEXO Magazine : June2010
To learn more, call 704.588.3371 or Toll Free 800.438.3111 Quality, consistency and efficiency in a pressroom translates into lower production costs. And no company is more committed to helping you achieve these goals with unprecedented results than Harper. So much so, we devote an entire division to the cause. Call 800-438-3111 to get started and receive a copy of our “Seven Element Flexo” free. GRAPHICSOLUTIONS DIVISION HARPERIMAGE.COM Americas • Europe • Asia ©2010 We’re talking savings. www.flexography.org june 2010 FLEXO 33 Figure 4 provides a comparison of magenta ink samples applied at two different weights. A UV exposure of 150 mj/cm2 was used for both samples. In this case tape adhesion was improved at the lower ink weight. This is due to the increased UV penetration through the lower density ink layer. MEK resistance appeared to be lower with the lower weight sample because the solvent can more easily remove the lower amount of ink. Tape adhesion for both samples was greatly improved by subsequent EB exposure. Figure 5 shows the results for ma- genta ink after UV curing and after sub- sequent EB curing. The results provide a comparison of EB exposure in air and with nitrogen inerting. No significant difference between the samples was observed. In both cases tape adhesion and MEK resistance were dramatically improved by EB exposure. It was somewhat surprising that the results were essentially the same for EB curing in air and EB curing with nitrogen inerting. A control experiment was con- ducted by curing the inks with EB alone without the initial UV cure. As expected the inks were wet after EB exposure in air FLX_June2010_mech.indd 33 6/10/10 9:39 AM