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Need Help Printing dark graphic banner shows off-color banding

Discussion in 'Digital Printing' started by Andrew Hodgson, Jul 22, 2019.

  1. Andrew Hodgson

    Andrew Hodgson Member

    54
    3
    8
    Apr 25, 2018
    Lombard
    Hello, I have noticed off-color banding when printing black on vinyl banners. It looks like this only happens on the edge of the graphic of an 8' print on our 98" wide HP FB750 printer and when printing a black background.

    Printer: HP FB750
    Media: Frontlit Banner
    Print Resolution: Indoor Signage
    Mode: CMYKcm
     

    Attached Files:

  2. RICHARD SIMMONS

    RICHARD SIMMONS Member

    108
    11
    18
    Jul 12, 2019
    Panama city, Panama
    It seems to me that the banding is not in all the surface printed. It seems that you have problems with the nozzles that are covered at some point. Clean heads with a powerfull cleaning
     
  3. GaSouthpaw

    GaSouthpaw Active Member

    827
    165
    43
    Dec 1, 2005
    Georgia
    We've had that same issue, and no one could ever adequately explain what it was- or why it happens only every 8-18" or so (instead of every pass across), and only on the direction change. We changed thermistors, purged ink completely and tried new inks, replaced lines, heads... Nothing worked. The only thing we ever came up with to correct it was changing the print mode to a higher quality (which sucks, when doing banners or other "throw-away" graphics).
     
    • Agree Agree x 2
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