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FLEXO Magazine : June 2012
quality or has not been adequately greased — even if the journals are straight. There has been a tendency in the last decade to manu- facture anilox with much thinner walls to reduce the cost and weight of each roll. Particularly on higher speed presses, great care must be taken with larger rolls to ensure that there is no deflection. Walls that are too thin can also lead to har- monic issues, which can lead to chatter between the blade and the surface of the anilox. This can lead to premature wear of the blade, poor ink laydown, spitting and damage to the engraved surface. In talking about harmonics, it is probably pertinent to mention dynamic balance of the integral roll or air cylinder. Failure to balance any cylinder will lead to vibration and harmonic issues. Static balancing is not enough. Ensure that you demand dynamic balancing and choose a company with plenty of experience. The rolls should be run at speeds greater than the highest that the press is capable of, as well as be certified. Don’t assume that your rolls will have been balanced, especially if operating a used machine with exist- ing anilox or air mandrels. CAREFUL CONSIDERATION It is well worth the cost to have the equipment checked out and adjusted, if necessary, particularly on larger rolls or rolls that will be run at high speeds. Out of balance rolls will create significant vibration and bounce that cause premature wear to just about every component. These unwanted movements also dramatically impact the achievable print quality. Also, take care when lifting anilox with long thin journals. Unfortunately, many presses require lifting the anilox on the extended portion of the journal. This can lead to bend- ing, which may cause severe TIR issues. If possible, try lifting an anilox on the widest part of the journal (as close to the header face) on both sides or, with a saddle type-fitting belt around the body of the core. Of course, by choosing to do this, the surface of the anilox should have an adequate, thick protective cover on it. Please note that a piece of corrugated • We design & build every machine to order. • Our patented frequency sweep technology allows longer cleaning times if required, eliminating the need for more caustic solutions. • Our technology will clean all line counts and guaran- tees deep cleaning of every cell, safely & efficiently. • All machines are fully automated with factory preset cleaning parameters, making it simple for any opera- tor with the push of a single button. • Over 21 years of providing cleaning solutions & equip- ment to every print market around the world. • Our non-VOC non-HAP bio-degradable cleaning solu- tions are safe for the environment, product & operator. • Ultrasonic cleaning is the most effective, least labor intensive technology available for cleaning of your aniloxrolls, sleeves, plates & other machine compo- nents. • For more information give us a call at: CaresoniC Usa The best in Ultrasonic technology. The Granddaddy of them all. TheFlexoFactor • 704-962-5404 • email@example.com • www.theflexofactor.com Innovative Solutions for Today’s Flexographer Authorized North America Distributor • A division of SJW ASSOCIATES LLC 2814 Yorkview Court, Charlotte, NC 28270 (Above) Engraving showing scoring damage from doctor blade (Left) Microscope with camera for cell inspection www.flexography.org junE 2012 FLEXO 93