HALO
An unwanted halo around the edges of the print, which is generally caused by in-correct printing pressures between the printing form and the substrate
Cause
1 Printing pressure is not uniform.
2 The printing pressure is too high and not regular and constant.
3 The printing forme or the mounting tape is too hard
4 Too much ink.
Solution
1 The forme carrier (sleeve/cylinder) concentricity is out of tolerances, control and correct.
2 Check the uniformity across the web and adjust the pressure.
3 Use softer printing formes. Check the hardness of the mounting tape.
4 Use an anilox roller with a lower cell volume.
Helmut Mathes, troubleshooting defects supplied curtesey of Flexo & Gravure Int''l 2011
PRINTING PRESSURES
Flexo is a contact and pressure sensitive process. Increasing printing pressure, influences ink transfer and has a significant impact on print quality and performance
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INK TRANSFER - FLEXO PRINT FORM
The flexo print form is a fundamental part of the printing process and has a significant impact on ink transfer and cleanliness of the inking process.
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