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FLEXO Magazine : June 2012
ear with the web direction. The 75-degree has a slight angle, much less than the 45-degree variation, making it run much better when using an enclosed doctor blade chamber. These engravings react totally different at times with all inks and coatings and should be tested well before making any changes in your printing or coating process. Recently, good re- sults have been seen with this at the 75-degree angle using UV inks, as well as water base adhesives. The constant channel recycles inks and coatings out of the channel on each revolu- tion of the roller, thereby allowing the chemistry to run cleaner. This geometry should be applied when there is drying from the sides of the cell walls. The coating plugging the anilox cell from the sides usually causes this issue. The trihelical lets these coating or inks run cleaner. If there is a struggle with premature plugging, this may be an alternative worth looking into. XTR also works great on in-line adhesive applications for couponing, laminations and any similar application. It may not always apply a defect free finish, so testing is again sug- gested to see where it can be best used. This geometry works especially well where the ink or coating has a fast dry rate or with very viscous coatings and adhesives. Abrasive chemistries are also another application for this geometry. I frequently use this in paper-to-paper and paper to film lamination applications. You will see that this has a very specialized range. CONCLUSION As printers, we get caught up in CPI – Cells Per Inch (line screen) and forget about volume. CPI, to a degree, will help FIgUre 14 75 degree TH FIgUre 13 FIgUre 15 45 degree TH FIgUre 16 89 degree TH 74 FLEXO june 2012 www.flexography.org