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  1. #1
    Premium Member
    Biklops's Avatar


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    Default What causes this "coffee ring" pattern in my prints!?

    Hi all!

    Well, look at this:



    I've been getting this on allot of my prints. It sort of comes and goes. Usually in large solid color areas, but this hand was only like 4" by 4" or so. I hate it! What causes it? Loose screens? If so my Victory Factory screens were loose from the get-go!
    ----
    AWESOME>>www.biklopsdesign.com
    tweet? >>@biklops

  2. #2

  3. #3
    mono_666's Avatar

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    Default

    Quote Originally Posted by Biklops View Post
    Hi all!

    Well, look at this:



    I've been getting this on allot of my prints. It sort of comes and goes. Usually in large solid color areas, but this hand was only like 4" by 4" or so. I hate it! What causes it? Loose screens? If so my Victory Factory screens were loose from the get-go!
    I get that sometimes too, but sometimes I dont... I havent figured it out yet

  4. #4
    Premium Member
    swampviking's Avatar


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    Default

    Paper sticking to the screen?

  5. #5
    goad74's Avatar

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    Default

    It's a ghost.

  6. #6
    seireyho's Avatar

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    Default

    Quote Originally Posted by swampviking View Post
    Paper sticking to the screen?
    That's what I was going to guess. That's wierd how its a perfect circle.

  7. #7
    HolyCrapstick's Avatar

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    Default

    What type of light source did you use to expose your screens?

    Looks like a light halo.

  8. #8
    Premium Member
    marmite's Avatar


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    Default

    Quote Originally Posted by HolyCrapstick View Post
    What type of light source did you use to expose your screens?

    Looks like a light halo.
    yeh.

    is the circle always in the same place on a batch of prints....?

    if not then the screen is sticking to the print, non?
    which is solved by fixing the paper down better, tighter screen, anti static stuff in the ink etc

  9. #9

    Default

    yeah, paper sticking to the screen.
    I had this happen to one of the colors of my last print and couldn't figure out what was causing it... other colors worked fine. I use a vacuum table and my off contact should be fine, tried thinning the ink, different squeegee angles, etc...
    I was using a Victory Factory screen too, I think you might be right about the screen being loose.

  10. #10

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    Default

    Raise the height of the screen. I'm willing to bet you are'nt using a vacum table. If you are then your screens to low or you need to fix your vacuum table if you are.

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