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HP Indigo 7000 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.
Replacing ink cans
Replace an ink can when:
  • An ink concentrate can is empty, as indicated by a message displayed by the software.
  • When you want to change the color of ink in an ink tank.
  note:
Flush the ink tank before changing the ink color
Ink can replacement can be performed while the press is printing.
  caution:
Wear safety glasses and ink resistant gloves for this procedure.
  1. Open the ink cabinet door.
  2. In the ink cabinet, pull the bottom end of the empty ink concentrate can out, and lift it up.
    Figure : Ink can replacement
  3. Shake a new can of HP ElectroInk and remove the foil from the can.
  4. Insert the new can in the holder with the nozzle down. Fit the nozzle in the O-ring in the base until the can clicks into place.
  5. Your system updates automatically when you install a new can.
Rebuilding the ink in a tank
Rebuild the ink in a tank when:
  1. You change color in an ink tank
  2. You suspect ink contamination
  3. To correct print quality issues
  note:
If the ink tank is not empty and clean, drain and clean it using this procedure.
  caution:
Wear safety glasses and ink resistant gloves for this procedure.
To build a new ink:
  1. Place the press in Standby mode and press an Emergency Stop button.
  2. Drain the ink from the tank.
  3. Disconnect the two water connections.
  4. Remove the ink tank from the ink cabinet
  5. Remove the ink pump from the ink tank
    Figure : Removing the ink tank
    Figure : Ink pump removal
  6. Fill the tank with 3.8 liters (1 gallon) of imaging oil. Make sure 0.3 liters (0.08 gallons) of imaging oil remain in the fill container.
  7. Reinsert the ink pump into the ink tank.
  8. Reinstall the ink tank, and make sure the motor is attached (handle is pushed back completely). Reconnect the two water connections. and close the ink cabinet door.
  9. Release the Emergency Stop button.
  10. From the Main Menu, select Ink and BID.
  11. In the Ink and BID Panel, select Build Ink.
  12. Follow the wizard instructions.
Draining ink tanks
Drain the ink tanks when changing color in an ink tank, before a long-term shutdown, or in case of ink overflow.
  caution:
Wear safety glasses and ink resistant gloves for this procedure.
To drain the ink tanks:
  1. Make sure that you have a used imaging oil container for drained ink for each tank you plan to drain — each tank contains 3.8 liters (1 gallon) of ink.
  2. Place the press in Standby mode and press an Emergency Stop button.
  3. Using the flexible drain hose for the ink tank, drain the contents into the waste container.
    Figure : Drain hose
    1
    Drain hose cap
    2
    Ink tank drain hose
  4. When finished, place the hose back on the ink container, screw the cap in place, and close the BID hose connector.
  5. Dispose of ink in accordance with your local waste disposal requirements. Drained ink that is not contaminated can be stored in sealed containers for later use.
  6. When preparing for a long shutdown (more than four days), remove the ink tank. Wash the ink tank and ink pump in the BID Washer basin or cleaning station.
Cleaning the ink pumps
Clean ink pumps when prompted or as shown in the maintenance routines.
Make sure to have the following items before performing this procedure:
  • Wastebasket or tray lined with plastic liner to hold the ink pump unit
  • Wash basin
  • Fine cleaning brush
  • Density sensor cleaning paper
  caution:
Wear safety glasses and ink resistant (nitrile) gloves for this procedure.
To clean the ink pump:
  1. Go to Standby, and press an Emergency Stop button.
  2. Disconnect the two water connections.
  3. Remove the ink tank from the ink cabinet
  4. Remove the ink pump from the ink tank
  5. Place the ink pump in the wash basin or in a plastic-lined tray.
      note:
    Do not remove the filter from the pump. The plastic holder can break.
    Figure : Ink pump
    1
    Filter
    2
    Magnets
    3
    TCU board
    4
    Level sensors
    Figure : Ink pump density sensor
    1
    Density sensor
  6. Clean the filter, magnets, and other area of the pump using imaging oil:
    • Use a nylon brush to clean the inside of the ink outlet.
    • Use clean imaging oil to remove the ink waste.
    • Clean the density sensor slit with density sensor cleaning paper.
    • Clean the sensor with imaging oil and a nylon brush.
  7. Reinstall the ink pump unit into the ink tank, and reinstall the ink tank into the press.
  8. Connect the two water hoses.
  9. Release the Emergency Stop button.

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