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Strange lints on exposed plates

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  • Strange lints on exposed plates

    Hi,
    We have two Agfa platesetters and two processors and we use Agfa thermal plates. The machines are fairly new, only 10 months old.
    After exposure and processing we can see some small lints, threads on the plates (you can see them in the attached photos). They usually canít be seen on fresh plates, but when they are placed into the machines these lints accept ink and appear on prints. They are always located on different places.
    In some cases we find more than 50 of these defects on one plate, but in other cases just a few, but they are always there. The machine minders can mostly take them out with a corrector pen (if they are on unprinted area).
    We can exclude that these threads get to the plates when they are placed into printing machines because we examined fresh plates after exposure and processing and the defects were already there. One of the filters was just replaced, we cleaned all rollers in the setter but we still have the problem. Once we tried to make the plates with the other two machines (they are on standby) but we still experienced all the lints. It looks like these threads are attached to the surface of the plate and the laser canít light through them so it leaves unexposed lint-shaped marks on the plates.
    How could we solve this really annoying problem?
    Any help would be greatly appreciated.
    Attached Files

  • #2
    Hi Computertoplate and welcome to GDF.

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    • #3
      If this processing involves water, have that checked. We had a heck of a time with silkscreen failures due to crap in the water for a while, until we got a double filter system in there.

      Also, possible static cling issues. Do you have an anti-static bar in the process?

      Comment


      • #4
        Thank you for your answer.
        Yes, it involves water. First we changed the water hardness, because it was too hard for platemaking. It was around 18 įdh and it is 8-10 now but the defect is still present. Furthermore I don't think that these lints get to the plates during processing, I think more like during exposure.

        There is a roller that is in continuous contact with the plate. It presses the plate to the drum and it has to clear the dust from the surface of the plate. And there is an other roller which is in touch with the first roller and it clears the dust from that roller.

        Comment


        • Computertoplate
          Computertoplate commented
          Editing a comment
          It is a really frequent and annoying defect that causes us a lot of inconvinience, so I am still looking for the solution.

        • Computertoplate
          Computertoplate commented
          Editing a comment
          Any other idea? Anyone?

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