Flexo printing

Back Doctoring

Ink is continuously dripping along the entirety of the containment doctor blade. This occurs because it is removing ink from the surface of the anilox roller outside the chamber, rather than allowing the ink to enter the chamber.

Back Doctoring

Causes

  • Doctor Blade Pressure too high
  • Doctor Blade too thick
  • Wrong Doctor Blade Tip
  • Containment Doctor Blade worn out
  • Wrong End Seal
  • Ink viscosity out of spec
  • Chamber out of alignment

Solutions

  • Used lowest possible doctor blade pressure
  • Use thinner containment doctor blade
  • Containment blade should be FlexoTip
  • Change Doctor Blade
  • Use correct End Seal
  • Check Ink viscosity and make sure it is in spec
  • Calibrate Chamber
  • Use OptiPrint, PowerPrint, CeraPrint, CeraFlex XT

Recommended Solutions to solving Back Doctoring

The new CeraFlex® XT - doctor blade
CeraFlex XT
OptiPrint
PowerPrint
CeraPrint®

More to Troubleshoot?

Scoring Lines
Ink Spitting
Ink Spitting
Leaking
Anilox Wear
Dot Gain
Bridging / Filling In
Excessive Doctor Blade Wear
Wavy Doctor Blade
Wavy Doctor Blade
Halo Effect / Haloing
Chattermarks

Contact Us

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