Ductor blade flaw

Once commonly and erroneously called a doctor blade flaw, the latter name is now used in the flexographic printing process (letterpress/typography using a flexible plate).

The ductor blade removes excess ink from an inking roller before that roller transfers ink to the printing plate. Its machinery can break down and stop, leaving a thin inked line across the printed sheet.

Ductor blade flaws are not constant across all printings and thus are not considered full-blown errors.  File:GB ductor blade.jpg|detail showing the very fine inked line File:GB ductor blade xmas.jpg|the ductor blade stopped/jammed twice here. File:GB QEII ductor blade or.jpg|assumed to be caused by a ductor blade that was cleaned with too much solvent or a ductor roller that had a few drops of solvent on it. 

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