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HP Customer Support - Knowledge Base

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HP Indigo WS6000 Digital Press - Ink system overview

HP ElectroInk, the ink used by the press, is mixed on the press from three components: imaging oil, imaging agent, and ink concentrate.
To ensure consistent printing quality and smooth press operation, the press monitors the following ink characteristics:
  • Density (concentration of pigment particles in the ink)
  • Conductivity (the adherence capacity of ink to the image areas and its repulsion from non-image areas)
  • Temperature (determines adherence of ink capacity to the substrate)
  • Ink levels
When the ink characteristics approach the specification limits, the press system displays a warning message. If you ignore the warning, and the ink characteristics slip outside the limits, the press changes to the Standby state.
Perform the following activities to ensure correct operation of the ink system.
  • Replace ink cans:
    • When ink concentrate can is empty
    • To change the color in an ink tank
    .
  • Rebuild ink:
    • When changing color in an ink tank
    • If you suspect contamination
    • To correct print quality issues
  • Drain ink tanks:
    • When changing color in an ink tank
    • Before long-term shutdown
    • In case of ink overflow
  • Add imaging agent to adjust ink conductivity
  • Clean the ink pumps according to the frequency shown in the maintenance routines
note:
The inks used in the press are highly sensitive to IPA contamination which can radically change the conductivity and electrical parameters of the ink.
When cleaning with IPA, always take special precautions not to contaminate the ink.
If you suspect contamination, thoroughly flush the ink from the system and replace it with fresh ink.

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