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FLEXO Magazine : June 2013
a Mylar as containment, is to help control back doctoring, shown in Figure 8. Back doctoring happens when two steel blades are used and there is ink left on the anilox roller that the plate did not remove for transfer. It gets wiped off by the containment blade and runs down the front of the holder causing an “ink leaking” INSTALLATION As with all doctor blades, proper installation is another key component to performance. Making sure the holder is clean of ink and the doctor blade lays flat in the holder with no waves is the first step. If your doctor blade of choice has a machined tip (Lamella or bevel), the second part of the installation check will be to insure the tip is installed properly. See Figure 9. Please remember that these are just guidelines for a good starting point for your doctor blade selections. Also, don’t forget every press and pressroom is different, as your job mix can be different from week-to-week, or even day-to-day, so you may end up using different types of blades on each press. This is not an ideal set up in the pressroom. Sometimes, job mix makes the difference. There are a lot of obstacles in the way. Sometimes, we have no control over them on the press, but if you use these points of knowledge and charts as a reference guide to get started, it will make it easier to troubleshoot later, knowing we have the proper doctor blade in the press. If you have any questions, be sure to get your doctor blade supplier involved. Ask for press side training or classroom seminars. If they are worth their weight in doctor blades, they have already done a pressroom evaluation for you and will be able to diagnose any issues you run into with a phone call or visit. n ABOUT THE AUTHOR: Johnny Stamey is the technical product manager for Daetwyler Corp. Prior to joining MDC in 2000, he received his Journeyman Printer Certification from the North Carolina Department of Labor and held previous positions as press operator for RR Donnelley and proof press technician at Keating Gravure USA. Johnny is an active mem- ber of the FTA, where in 2004 he was awarded the FTA’s Au- thor’s Excellence Award. He is currently serving on the board of directors of the Gravure Asociation of America (GAA), where he is a member and a Golden Cylinder Award Judging Panelist. He can be reached at (800) 627-1011 or by email at email@example.com to discuss and/or troubleshoot any doctor blade questions you may have. Figure 8 Figure 9 80 FLEXO June 2013 www.flexography.org NOW acceptiNg eNtries year-rOuNd fta’s 2014 excellence in flexography awards competition www.flexography.org/excellence