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FLEXO Magazine : June 2013
can only happen by making modifica- tions to the end seals or repairing the chamber in some way. Contact your blade supplier when you have doctor blade questions. There is good support in this area of the indus- try for help troubleshooting pressroom issues. CHAMBER INSPECTION Chamber inspection should start with checking chamber alignment. Everything fatigues over time. Many of the materials that the anilox chamber is made of can fatigue, warp and go out of alignment. It is imperative that you start by knowing if the chamber is aligned properly to the anilox roller. Check for blade alignment across, as well as contact the anilox roller on each side and top and bottom. The contain- ment side blade should make contact slightly before the metering side blade does. Include inspecting and checking for chamber alignment in the regular preventative maintenance program for the press. Inspect the blade every time you change one. Inspect the blade that you are throwing out. This tells you a lot on how the chamber is running. Uneven blade wear, in general, is a sign that something is wrong, or out of alignment. If at some point scoring or back doctoring becomes an issue, then changes may need to be made to the way the blades are set up in the chamber. Always start out with the OEM recommended settings first, then make changes as you go, if needed. The blade makes contact with the anilox 100 percent of the time. It only makes sense that the alignment and pressures with that blade will make all the difference in the life of the anilox roller. It is critical that the proper blade tip, thickness and pressures are used when doctoring the ink. Preventative maintenance needs to be done on chambers on a regularly scheduled basis. The older the chambers are, the more you need to be concerned about warping and metallurgical issues with those chambers. Take time to schedule maintenance to check these chambers out for alignment and stability on a regular basis. CHAMBER PREPARATION Chamber preparation is critical within the daily routine for anyone using doctor blade chambers. Keeping the clamps clean and all pressure points clear of debris will allow for a straight and even doctor blade setting. Contami- nation or ink debris between the clamps will cause blades to ripple. Screws and bolts that hold down the clamps need to be proper size, so that they do not interfere with the anilox sur- The blade should never overhang the end seal, but should stop in the middle of the end seal as shown above. www.flexography.org June 2013 FLEXO 59 © 2013 Harper