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  • Ink Adhesion Issues

    We are running the Fujifilm Acuity Select 4006 flat bed and having issues with ink adhesion on rigid polypropylene. Ink scratches off very easily even after being left overnight.

    UV lamps turned to max. Uvijet adhesion master used but made minimal improvement. Using Uvijet KI inks.

    Something I'm missing or is this normal?

  • #2
    Have you checked the Dyne level of the substrate. was it Corona treated prior to printing. Turing up the lamps may not help as 'cure' and 'adhesion' are two separate issues

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    • #3
      Originally posted by Cornishpastythighs View Post
      Have you checked the Dyne level of the substrate. was it Corona treated prior to printing. Turing up the lamps may not help as 'cure' and 'adhesion' are two separate issues
      The material is the same that we have had other companies print on prior to getting our own machine, it hasn't been treated.

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      • #4
        Originally posted by NZOC View Post

        The material is the same that we have had other companies print on prior to getting our own machine, it hasn't been treated.
        Even though the material is same but the surface tension may have increased due to lack of corona treatment or if its an old stock. Usually corona treatment last not more than a year. If this is the case , the ink will not adhere to the substrate even though the ink is cured properly.
        Asif Qazi
        www.facebook.com/printindustry

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        • #5
          Could be an over cure. Using the MEK test could help you to see if you are curing the print properly. Using MEK and a cotton swab stroke 20-25 times to see if ink is removed. Less than 20 strokes is under cure and over 25 strokes is over cure. One back and forth stroke counts as one.

          D Ink Man

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          • #6
            Originally posted by aqazi81 View Post

            Even though the material is same but the surface tension may have increased due to lack of corona treatment or if its an old stock. Usually corona treatment last not more than a year. If this is the case , the ink will not adhere to the substrate even though the ink is cured properly.
            cant ever assume treatment has not gone past time. to me sounds like the need for fresh stock

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