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FLEXO Magazine : February 2010
www.flexography.org FEBRUARY 2010 FLEXO 25 TECHNOLOGIES & TECHNIQUES Over 40 years of experience in the ﬂexographic industry, design and production of the highest quality systems. innovation is the key to our success. COMPUTER CONTROLLED VISCOSITY CONTROL SYSTEM IN THE ROU SLEEVEMAK SYSTEMS Head Ofﬁce AV Flexologic B.V. H. K. Onnesweg 2 P.O. Box 252 NL-2400 AG Alphen aan den Rijn The Netherlands Tel +31 (0)172 434221 Fax +31 (0)172 437919 Mail av@ﬂexologic.nl Toll Free number from the UK 0800-3892121 (only accessible in the UK) PHOTOPOLYMER PLATEMAKING EQUIPMENT FULLY AUTOMATIC MOUNTING MACHINE for ﬂexo printing plates (for the ﬂexible packaging and corrugated industry) Advanced MOUNTING & PROOFING EQUIPMENT (for the ﬂexible packaging, corrugated and label industry) www.ﬂexologic.nl PRE-PRESS EQUIPMENT FROM MODEST SYSTEMS TO THE MOST ADVANCED HIGH-TECH SOLUTIONS gies, such as FM. In order to achieve a high definition print image of these fine screen plates, anilox rolls in excess of 1,000lpi need to be used. However, those engraved today are limited in terms of depth, and as such carry less ink volume. More often than not, a printer has to split solids and tones, adding ad- ditional cost, setup time and ink. Brand owners demand that their packaging stands out in the crowd without sacrificing any definition. In ad- dition, due to the complex colors of the design, it seems that printers can never have enough decks to satisfy this de- mand, so solid and tone plates have to be combined which can either sacrifice density or increase dot gain. TROUBLE FREE There are numerous applications for the HVP engraving. Plates imaged at 200lpi can be utilized with anilox line screens as high as 1,600lpi, and density can be achieved with volume as low as 1.4. If a customer is using a 500lpi, 5.0bcm2 volume, 60° engraving for combination printing and wants to reduce his dot gain so he can print with a higher line screen plate, he can utilize a 700lpi HVP anilox with a 5.0bcm2 volume. A corrugated printer can utilize a HVP 360lpi, 7.5bcm2 roll, improve his printing, and not have to worry about cells plugging. These rolls can be used on all substrates for any printing application with both doctor blade and rubber roll metering. HVP technology was printed in trials at Clemson University (Clemson, SC) and independently evaluated by an industry expert alongside other tech- nologies. The printed result (bottom left) shows at the 70 percent contrast range the HVP cells stayed open and clean with no dot bridging, while the other technology flooded, causing increased dot gain. Control of the 70-percent tone makes the difference between having trouble- free production and downtime to clean the printing plates. The relationship between the anilox engraving pattern, the doctor system, the volume of the roll and the screen count of the printing plate determine what can be printed successfully. If you achieve the required contrast between the density of color of the solid and the density of color of the 70-percent tone, which is where the dots begin to form, the rest of the print will stay clean and trouble-free. The ability to improve ink density at higher line screens and print cleanli- ness with an anilox engraving that minimizes cell plugging and score lines is truly an advancement in anilox technology. ABOUT THE AUTHORS: David McBeth is the global VP sales and marketing for Pamarco Global Graphics. He joined Pamarco in 2006 as European VP and transferred to the U.S. in 2008. He is formally of Creo (now Kodak), where he held the position of packaging sales di- rector based out of Vancouver, Canada, working on digital flexo advancements, specifically CTP technology. McBeth has an MBA in Business and Economics. John Bingham is President of Bingham Flexo Services (BFS). BFS represents a number of high quality products servicing the flexographic marketplace, and currently represents Pamarco within the Midwest territories of the U.S. A new ceramic coating technology supports to increased volume and unique cell shape of HVP anilox rolls. Results of a trial at Clemson University comparing 70 percent dots from a HVP anilox (left) and ge- netic transfer rolls (right). A comparison of the cell structure of HVP anilox rolls (left) and genetic transfer rolls (right).