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FLEXO Magazine : January 2010
www.flexography.org JANUARY 2010 FLEXO 37 Toll-Free: 866.282.7697 • Toll-Free Fax: 800.223.6869 • info@AndVre.com www.AndersonVreeland.com the Difference! Experience Expanding the bubble-free flexoscape to meet even more customer expectations From mostly solids to maximized dot process work, you can fnd exactly what you need in the ever widening line of 3M™ Cushion-Mount™ Plus Flexographic Plate Mounting Tapes. Best of all, these tapes are brought to you by Anderson & Vreeland, with almost 50 years of fexo platemaking experience. 18 Series firm tapes for mostly solids in a combination of solids and halftone images. 17 Series medium frm tapes for slightly more solids in a com- bination of solids and halftone images. tapes for high speed printing with fne type reverses & expanded color gamut. 10 Series standard combination tapes when solid and halftone areas are equally important. 13 Series medium soft tapes for high speed printing of combination work when halftone areas exceed solids. 19 Series soft tapes to improve tone reproduction when process and halftone images predominate. 11 Series process printing tapes with low density to maximize dot reproduction for high quality process and screen printing. Across the line Easy Mount Adhesive for virtually bubble-free mounting. Combination Printing Process >>> >>> New! See us at INFO*FLEX booth 513-519 • If the anilox rotation is with the flow of the web and the rotation is minimized (slower than web), that is the least amount of coating you can apply. • If the rotation is against the flow of the web and the rotation is minimized (slower than web), that is the least amount of coating you can apply. • If the rotation is against the flow of the web and the rota- tion is maximized, that is the most amount of coating you can apply. METERING Metering describes how the anilox surface is controlled, be it by blade or rubber roll. It is important to note the difference. Two-roll, un-bladed systems are not consistent in application and cannot be calculated accurately based on the anilox used. Press speeds, metering pressure and hardness of the rubber meter roll can change the coat weight in two-roll, un- bladed systems. Chamber and reverse-angle doctor blade systems contrast un-bladed systems by providing consistent delivery at different speeds. Keep in mind that, although it is difficult to determine from the anilox end how much coating is transferred in a un-blad- ed system, the printed product from two-roll systems allow for the deposit weight to be calculated and the material tested for performance. You can use the samples for determining targets for a bladed system. Contact your coating or anilox supplier to assist you in calculating the weight difference. SUBSTRATES It is always a good idea to include information about substrate construction. The basis of the construction---film/ film, film/paper, BOPP, etc.---is helpful in looking for cases of incompatibility (meaning the product won't interact as antici- pated with the substrate) or dive-in on the substrate. Any time the construction is changed by material substitution, the coat weight needed may change drastically. Coating applications do not have to be difficult, but get- ting the right result instead of many wrong results requires diligence in information gathering and verification. The sole purpose of the exercise is to dissipate variability and error from the final calculation, so you apply a correct and consistent amount of coating. Rely on your coating and anilox supplier for assistance in gathering information and understanding the transfer process. If data is not available, there are still ways to find a solution. The follow up article in this two-part series (see FLEXO Feb. 2010) will discuss both the effects of ranges and mistakes in the coating application and avenues for determin- ing coat weight when the numbers are unavailable for com- plete calculations. ABOUT THE AUTHOR: Sean Teufler proudly serves the cen- tral U.S. as a technical graphics advisor for Harper Graphic- Solutions, a division of Harper Corporation of America. TECHNOLOGIES & TECHNIQUES
Sustainable EOY 2009