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weird banding in white area

Discussion in 'Hewlett Packard' started by bigben, Feb 28, 2019.

  1. bigben

    bigben Very Active Member

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    I have an HP L26500, using a new synthetic paper and have created my own profile. For some reason if I print something with heavy covering beside a white part. I will have fine banding in the white part where there supposed to have no ink. It's not very noticable, but I can wipe the banding with my finger.

    Here is the best picture I could take. You can barely see it, but it is more noticeable in person. I've never experienced this before. What could be the problem and solution?
     

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  2. DerbyCitySignGuy

    DerbyCitySignGuy Very Active Member

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    So when you print pure white next to a block of color, for instance, the white has a slight hue to it the first few passes?

    Could be a static/overspray issue? Some of the CMYK inks getting on the white heads and creating a slight off color for the first few passes. That would be my best guess.
     
  3. bigben

    bigben Very Active Member

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    This is exactly what happen and is exactly what I suspect (static/overspray). How can I manage this?
     
  4. DerbyCitySignGuy

    DerbyCitySignGuy Very Active Member

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    I know you said it's paper, but can you treat the area with an anti-static spray before printing (easier said than done on a roll to roll machine)?

    Short of keeping your print room at 70 degrees and 50% humidity, I've never found a perfect way to deal with static.
     
  5. BIG EASY DOES IT

    BIG EASY DOES IT Very Active Member

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    I don't think it's overspray. If it looks like banding my guess would be optimizer. Optimizer is clear but certain substrates you can see it. Also if you have a vector that is colored white there is a lot of times where the HP will lay down optimizer but no color. My guess is you have a banding issue with your optimizer head and you can see it in the blank areas.
     
  6. bigben

    bigben Very Active Member

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    With the winter right now, it's very dry in the shop. This is why I think it is a static problem. I've just printed the same thing to a regular vinyl and there was no problem at all.

    I can't be the optimiser. My latex model (L26500) don't have the optimizer.
     
  7. DerbyCitySignGuy

    DerbyCitySignGuy Very Active Member

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    Yeah, paper sucks up moisture too. Run a humidifier full blast while printing?
     
  8. bigben

    bigben Very Active Member

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    I will go buy one first and see what happen.
     
  9. Jay Grooms

    Jay Grooms Printing, Printing, Printing......

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    and all night, and all weekend...... I don't think it'll ever warm up enough for us to turn our humidifiers off. I just love living in a cold dry tundra......
     
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