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FLEXO Magazine : June 2011
Technologies & Techniques alignment and measure the contact width in microns to ensure that press crews are using the correct doctor blade settings. Secondary cauSeS Score lines may appear even when blade pressure settings and chamber maintenance are under control. If scoring sud- denly becomes a problem in your operation, or on a certain press, chances are that at least one of the following is damag- ing your anilox inventory: • The wrong doctor blade “tip” for the application. • The wrong doctor blade “material” for the application. • Inappropriate steel without distributed carbides as doctor blades. • Ceramic chips from damaged roll ends in the ink or ink- ing system. • Blade overhang (doctor blades that are too long for the anilox and blade holder). • Pigment milling materials (steel shot or ceramic) in the ink. • Open inking systems that expose ink to airborne particles and substrate debris. This includes catch trays, open or uncovered ink buckets and free-flowing chamber systems. • Small dried ink chunks that drop off ink bucket walls and pass through the ink system. • Ink embedded in plastic or composite blades that are used as containment blades. • Ink-pan wiper holders rubbing against the anilox roll, blade chambers, splash guards or drip pans. • Metal shavings generated from worn press parts or machinery. • Metal shavings from maintenance and modification to the press. • Shop towels, rags, roll covers, cleaning brushes, work gloves and other items that come into contact with the anilox surface. • Rusty or non-filtered piping that carries ink, water, solvent or reclaimed solvent to the press. • Rusty or dirty safety solvent cans used for adjusting viscosity. • Unfiltered work-off ink. • Ink mixers rubbing on drum lids or the sides. • Metal fragmentation from offline cleaning systems. Sudden or long-term problems with scoring usually stem from a combination of issues and indicate that it is time to audit your entire operation. Managing Scoring Anilox scoring is best addressed on a preventive level. Flexo inking systems are similar to car engines: Just as changing a car’s oil and filters regularly will keep the car running smoothly, cleaning an inking system’s magnets and changing its blades and filters regularly will prevent anilox scoring. www.flexography.org June 2011 FLeXO 71
Sustainable Spring 2011