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[Help pls!] Uv printer White INK overspray dust (ink or static issue ?)

Discussion in 'Flatbed Printers' started by sunereyt, Aug 29, 2015.

  1. sunereyt

    sunereyt New Member

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    Aug 27, 2015
    We're new here so Hello to all !

    We're getting crazy to solve an issue we get since some time with the White ink.

    I use a small UV flatbed printer and sometimes, the white ink overspray as you can see on the picture.
    It is a kind of white dust.

    Done already:

    - Head cleanings.
    - Manual head cleanings.
    - Changed ink bottles (ink and printer manufacturers dont find out the issue as well).
    - Changed ink channels to see if it comes from printhead.
    - Shaked ink (may work a bit but overspray comes back afters 10-15 minutes or 2-3 printings)

    After all i have read. I am thinking it may come from electro static issues.

    Does anyone already had this kind of problem ?

    PS: This happens only with white ink, all other colors prints well.

    Have a nice weekend !
    [​IMG]
     

    Attached Files:

  2. seinsig

    seinsig New Member

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    Aug 31, 2015
    White Ink Issues

    What kind of print heads are you using? What is the recommended platen gap? It looks like you may be printing too far away from the substrate, do you have access to temperature controls in the head or subtank?
     
  3. sunereyt

    sunereyt New Member

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    Aug 27, 2015
    @seinsig

    Hello Seinsig, thanks for your reply !



    We are using a Epson R290 Printhead. It is a 6 channels. 2 Channels for white.

    Recommended gap is about 2mm but it is manual so we tried to lower the gap as well as put the substrate more far but it is not the issue.
    - If we print too far, then the whole image will be blurry.

    The head is temperature is around 22 to 30 C°.
    We did not check the ink tanks temperature but we can do it today.

    - Is there a recommended temperature ?

    About the room humidity, it is about 50%. We just put a humidifier to higher it up and see if it helps.

    Also we are changing today the white ink from bottle (with ink tube going straight from it) to an ink tank with blender inside so the white ink should stay homogeneous.

    Kr,
    Sune
     
  4. artbot

    artbot Very Active Member

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    Feb 18, 2010
    Houston TX
    i agree. my first impression is close the gap.
     
  5. seinsig

    seinsig New Member

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    Aug 31, 2015
    White Ink Issues

    I don't have experience with that print head, but if you have a clean jet test/nozzle pattern, and you're certain the gap is not the issue, then I would agitate the white ink and increase the tank temperature by a few degrees. I've seen this issue with Ricoh heads when the ink temperature is too low.
     
  6. sunereyt

    sunereyt New Member

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    Aug 27, 2015
    reply

    @Artbot

    Hello Artbot,
    If you mean narrow the gap between printhead and substrate (sorry my bad english :smile:), then it isn't that. We did it already. the only difference would be sharp print or blurry print but the white dust or overspray will stay the same.

    @seinsig

    I agree,

    Today, we changed ink tank to one with a motored blender inside as well as using a new ink bottle inside. For now we have perfect prints. White spray any more.

    Few weeks ago we had 400 prints to do and had this white issue a lot even as the temperature was very hot. it was more than 35C° in room.

    So until now, we think it is (was) ink that is poorly shaked. In consequence, the white ink was becoming heterogeneous.

    Also we found out today that some material we are using (Polycarbonate) is very electricity static wish may explain also that dust. For exemple, when is make the substrate wet, it doesnt spray !
     
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