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  • halmac
    started a topic UV Coating

    UV Coating

    Why is my UV coating fluid turning Brownish in the tank? Is it being contaminated? Oxidation? I am finishing sheets printed exclusively on a Konica Minolta 1060C.

  • halmac
    replied
    Thanks HRoss. The tanks are stainless steel. The vendor thinks the problem is the roller needed to be sanded down and possibly in the future resurfaced. I tried that and it seems to be working better. I certainly have a better finish.

    Leave a comment:


  • HRoss
    replied
    Probably not oxidation, however the product's ingredients could be slowly reacting. Is your tank Stainless Steel, or non-metallic, if not perhaps reacting with sidewalls of tank.

    Have you asked your UV coatings vendor...have them check their retained sample from the batch to see if it's happening there as well.

    Exposure to light (enough to cause slow curing to begin) could contribute. Does the coating when applied to the print look different then previously run jobs. The slight discoloration in the tank may disappear when actually run.

    Leave a comment:


  • curiosity
    replied
    could be exposure to uv light?

    Leave a comment:

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