Insufficient or missing ink transfer to the substrate of a part of the image, is generally caused by inconsistent contact pressure between the anilox roll, printing form and/or substrate, resulting in a poor ink transfer on to the finished product.

1 Low areas on printing forme.
2 Poor forme quality or make-ready.
3 Too low impression pressure.
4 Defective lock-up of the printing unit.
5 Printing forme cylinder bouncing.
6 Printing unit out of parallel.
7 Surface of the printing forme is not inked up. Treatment of the forme surface is not correct.

1 Check if variation in the forme thickness.
2 Control the pressure setting on the press. Check the correct forme preparation.
3 Adjust the pressure towards the printing forme and towards the anilox roller.
4 Check the nuts of the lock-up mechanism of the printing group.
5 Check concentricity of forme cylinders (and gears). Check if shafts, bolts, bearings, gears are free of dirt and do not show sign of wear.
6 Check the printing unit for the lateral parallelism.
7 Thoroughly wash the printing formes with the correct solvent. Replace the printing formes.

Helmut Mathes, troubleshooting defects supplied curtesey of Flexo & Gravure Int''l 2011


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The advantage of Direct Computer to Print

The advantage of Direct Computer to Print

Fast overall process with a simple digital workflow.

Total digital dot creation controls dot shape, relief depth and dot height

Direct engraving of ITR seamless continuous sleeves

Direct engraving eliminates washout and drying process

Perfect registration of plates and sleeves

'Cal-Kwik' automatic material calibration for engraving Polymer or Elastomer

'Perfect Balance' automatically re-balances the print form for high-speed printing