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FLEXO Magazine : June 2013
factors to control day-to-day along with good end sealing of the chambers. When end seals leak the common response is to apply more blade pressure to seal the chamber and slow down the leak. Suggested Improvements: Follow OEM recommendations - Apply rare earth magnets - Use proper filters - Check for proper blade pressure settings - Chamber alignment – Look for warping and clamp distortion - Review blade type being used - Check for excessive back doctoring and correct the problem. Apply proper filters and magnets to insure that all debris gets trapped and does not contaminate the ink environment. Clean filters out regularly or they will cause starvation within the ink lines, throwing all adjustments you made to the ink train out of balance. BLADE MATERIALS There are many blade materials and types of finishes on doctor blades, from plastic to white carbon steel, that can be used for metering. The blade on the doctoring side of the chamber usually is steel. The containment side can be either steel or plastic. Getting the chamber to seal properly is a combination of pressure setting, as well as end sealing and containment blade techniques. Those who have had ink leakage issues and have made changes to their blade and end seal settings have been the most successful with the wear and surface condition of their anilox rollers. If the chamber is not sealing properly, it needs to be fixed. This Chambers that are staged and ready to go will maximize makeready times and minimize anilox wear and tear. Chamber clamps should be cleaned often to insure there is no interference for the blade to seat in the clamp comfortably and remain void of any ripple after the clamp is tightened. 58 FLEXO June 2013 www.flexography.org