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FLEXO Magazine : July 2014
In addition, substrates vary in thickness. A 40-μm. variation in a substrate may produce a “wave” pattern of impression variances in a printrun. And every printer knows that even if a substrate has a rated thickness tolerance specification, it can still receive substrates that are out of tolerance. Many substrates are also prone to stretch- ing during the print process. Printers regularly adopt a “make it work” mentality, because they do not have time to deal with a man- ufacturer on an out of spec substrate. It is easier to squeeze it and get the job done with some over impression than it might be to change out a stock or miss a press date. Finally, plate and sleeve defects may necessitate over impressing. Plates, by their nature, have more variables than sleeves: • Mounting tape • Cushion adaptors • Mounting errors These can all change the pressure needed across the web. Heavy im- pressing may be necessary to mitigate low spots, press bounce and/or maximize the usable print area across the web when using plates. JULY 2014 | FLEXO 23