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FLEXO Magazine : June 2013
provide similar readings across multiple locations. Beside the color, gloss, and opacity specifications listed in FIRST 4.0 , one might consider tolerances for metamerism, if the print will be viewed under varied lighting conditions. Like- wise, specifications concerning yellow- ing might impact formulations for some overprints, and this might determine which photoinitiators might be allowed in a UV coating. From a physical properties stand- point, the most important is probably adhesion. Even adhesion to paper substrates can be an issue depending upon the content of the paper, along with what coating may be present on the surface. As more and more recycled materials make their way into common substrates, the chance for more waxes and slip agents to make it to the surface of the substrate becomes more of a factor. This, along with the smaller fiber size for recycled liners, makes adhesion and rub resistance harder to achieve. Understanding the needs of a particular printed item and the man- ner in which the ink or coating will be applied, one can develop an appro- priate set of specifications for the ink. While ink for a corrugated box that will be overprinted may not require water resistance, ink on film for bagged ice most certainly will. It is doubtful that the same ink would be used in both cases, nor should the ink specifica- tions be the same. Inks for outdoor or archival applications would have dif- ferent specifications than the inks for temporary indoor items, and how the item is handled and used throughout the distribution chain will have a nec- essary impact upon the requirements of the inks. Whether the ink for the Declaration of Independence would have performed as well on paper as it has on parchment is a matter of debate, but it is still common practice to use parchment for archival documents. So, understanding the relationship of inks and substrates is still quite important. This understanding can lead to a proper set of specifications for the appropriate ink for any project. n About the Author: James Ford is the senior chemist and special projects technical manager for Color Resolu- tions International (CRI) in Fairfield, OH. CRI is a global packaging ink company focused on water-based, solvent-based and UV curing flexo inks for corrugated, flexible packaging, envelopes, folding cartons and tags and labels. For more information about CRI, visit www.color- resolutions.com or call toll free at (800) 346-8570. James Ford www.flexography.org June 2013 FLEXO 101 Your printed package has only three to six seconds to grab their attention... 800.346.8570 www.colorr esolutions.com CRI inks speed up the process. CRI package printing inks and coatings are specially formulated for high-speed printability, adhesion and bond strength on any film or substrate. You’ll get brilliant high-gloss colors and a durable scratch and rub-resistant finish. Working with your team, our ink formulation experts and color management specialists will make sure your flexible packages keep your customers coming back for more. Custom blended CRI water-based inks, solvent inks, UV inks and EB curable inks will meet the precise requirements of your package. Contact a CRI technical specialist for fast response to your ink and color application questions.