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FLEXO Magazine : November 2009
34 FLEXO NOVEMBER 2009 www.flexography.org Since the dawn of marketing, man has wanted a stronger more vibrant image to catch the eye of the customer. It is a well known fact that the more a product blends in with the competition, the less that product sells. As such, marketing executives are constantly pushing the enve- lope (or packaging) to be brighter and more vibrant. This has put direct pressure on ink suppliers to provide inks that are stronger. The ink suppliers are also pushed by the operations people to provide inks that minimize setup time, print better, lower waste numbers and maximize uptime. These two forces have pushed the inks to be as strong as possible with the thin- nest film as necessary. Back in the early days of flexo, the inks were all solvent based. They would dry well at high speeds and volume levels Pigment Limitations Due to Applications and Formulations By Michael Hoft • The biggest factor that prohibits the printer from us- ing high-line aniloxes everywhere is the stock. • High line-screen anilox rolls pose a challenge to in- creasing the amount of pigments in the process inks while keeping the viscosity stable. • The current state of the industry for dispersions that are still flowable is limited to about the 45 to 50 per- cent pigment range, depending upon the pigment. Estimated proportions of the common components of inks. High pigmented inks printed at varying volumes on semi-gloss. TECHNOLOGIES & TECHNIQUES
Sustainable Fall 2009