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48 | l&l correct handling Bore cleaning w brush Sponge ramming down PCMC sleeve Sponge on back side Composite sleeve cross section Slinging guard in proper position Foam on bottom of sleeve rack sponges can be mounted to a brush. When cleaning bores, it is essential to use a detergent than cannot attack the resin and does not leave any lubricating film behind. And ensure that the sleeve bore is dried thoroughly. Pushing a wad of towels through the bore works beautifully. Remember that preventing ink buildup is as important as removing it: simple measures like covering unused mandrels with a plastic tube can make a big difference. When the chamber above has an end seal blow out, where does the squirting ink land? On the mandrel. Off-line cleaning Some of the ink systems used on films make cleaning the sleeves in off-line devices a must. When using off-line systems, always consult the manufacturer or agent for proper training and operating parameters. When media blasters are used out of adjustment and/ or with the wrong size media, they can harm your sleeves. Both media blast systems and water-based units require properly fitted end caps to keep the bore clean and dry. In liquid cleaning, inspect the sleeve ends before you begin to Labels&Labeling ensure there are no chips that expose the aluminum cladding or the aluminum end rings – many ink cleaners can be aggressive to bare aluminum. And when cleaning with water-based cleaners, make sure they are neutralized with water and the sleeves are dried to prevent water spots. Aluminum cladding makes sleeves more vulnerable to damage than conventional steel rollers. Dropping can bend the ends or make them egg-shaped; rubbing ceramic off the ends can lead to blistering; hitting the press frame when trying to load on the mandrel produces impact damage. Even little things like the brass scrapers used for cleaning are harder than the ends of the sleeves, so be sure to use plastic scrapers to damage fewer sleeves. Consult your suppliers for more information and suggestions – they can be your best sources for training and information. In summary, an air-loaded anilox sleeve is easier to handle than a roller, but it is also more easily damaged. Sleeves cannot be reconditioned as many times as a conventional roller, so it is up to pressroom crews to review their handling practices and work to protect their sleeve investments. I have seen sleeves last five years or more, and I have seen sleeves destroyed (some by me) before they ever even saw ink. Review your pressroom carefully, looking for areas where sleeves can sustain damage, and implement safeguards. When it comes to anilox sleeves, the old adage is true: an ounce of prevention is worth a pound of cure. And most importantly, it’s a lot cheaper. About the author Tony Donato is process and product development engineer at Harper Corporation of America. For the past 18 years he has been working in the area of anilox rolls and doctor blades as they are used in flexography. He is a board member of the Phoenix Challenge Foundation. This article is based upon the regular educational seminars held by Harper Corporation’s technical service arm, Harper GraphicSolutions. More information from www.harperimage.com.
E,T&H BSW Time is Money: Gallus RCS 330 and the brand new Gallus RCS 430 Maximum efficiency, total flexibility, and top quality: Gallus RCS 330 and the new Gallus RCS 430 combine all three with our ongoing determination to satisfy market trends. Smaller print runs and more frequent repeat orders demand shorter set up times, greater automation and minimum waste. Competition pressure demands extremely high productivity, while the call for ever more individualisation in printing and finishing processes can be satisfied only by flexible, modular systems. The Gallus RCS 330 and the new Gallus RCS 430 meet all these requirements in a single system. They represent a quantum leap in labelprinting technology. Gallus Ferd. Rüesch AG Harzbüchelstrasse 34 CH-9016 St.Gallen Phone +41 71 242 86 86 Fax +41 71 242 89 89 www.gallus-group.com A partner of Heidelberg
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