Cracking and ink coming off from the UV varnish surface

Discussion in 'Print Community General Printing Discussion' started by ANANDHAN, Nov 15, 2021.

  1. ANANDHAN

    ANANDHAN New Member

    Joined:
    Jul 2021
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    Location:
    MUMBAI
    Hi

    Coated paper board are printed first then primer coat of 3 gsm and UV cured then kept it for 3 hours for air dry and then it goes creasing at the dye cutter.

    White cracks are observed on creasing fold of the carton.

    What may be the reason and how to avoid it?
     

    Attached Files:

  2. ANANDHAN

    ANANDHAN New Member

    Joined:
    Jul 2021
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    Location:
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    Hi Members
    Please share your view or solution to this issue.
     
  3. ashok kumar

    ashok kumar Senior Member

    Joined:
    Nov 2017
    Messages:
    101
    Location:
    india
    Hi
    There many reasons for your problem.
    1) incorrect combination (ink/substrate)
    2) uv drying problem
    Pls confirm
    1) is it new system
    2) or this is running system and problem come in particular job/substrate
    3) it's Interminent problem
    4) problem comes after changing the ink
    Based on you reply solution will be there
     

  4. ANANDHAN

    ANANDHAN New Member

    Joined:
    Jul 2021
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    3
    Location:
    MUMBAI
    Thanks Ashok for your reply.

    This is existing system and doing in the same substrate. But this time only it is observed this cracking and ink coming off. magnified images of those white crack areas shows fibers and shiny coating layer. please refer the image in the attachment. Image no. 1 & 2 from those cracking area and image No.3 back side of the ink which comes off from the substrate. Please let me know.
     

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