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  • Solids appear lighter in leading edge

    we have a Heidleberg102 S+l.
    the leading edge on small solids looks lighter as if water was invading it. Not water streaks but just a bit lighter. Coming down on the water does not help. These are small squares that are effected. The other ares of color are not.
    Many help?

  • #2
    Ink needs to flow.
    Are you using take off bars aka run-off bars (ink patches placed in the non-live area of the sheet)? Take-off bars are solid area of color at least 1/4 inch deep that runs the width of the sheet. They are used in colors that have little or no coverage in the actual work in the live image area.

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    • #3
      No takeoff bars
      ive ran this job before and have seen it come up in other units with light colors.
      the ink is pms7488, a lime yellow. It’s a very slight difference just on leading edge.
      the other ares are not effected ( long stripes and blocks, just these 1/2 inch squares ).
      could insufficient plate to blanket cause this? Currently at.006. Was at .004 during the run.
      all rollers in good condition. Any settings on rollers that could help?
      could the ink be waterlogged from previous runs?

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      • #4
        Coming down on the water does not help

        Comment


        • #5
          Yuelig,


          Show us all a GOOD picture of the problem rather than trying to describe it !!!!


          Regards, Alois

          Comment


          • #6

            Comment


            • #7
              You need to provide clear pictures.
              Asif Qazi
              www.facebook.com/printindustry

              Comment


              • #8
                Hello Yuelig,


                Questions: Do these "WASH MARKS" appear on other jobs at the same position on the sheet ??

                2) If so what is the distance from the "Lead Edge" - 1st line of printing in mm to the printed defect ????

                3) DO look across the entire width of the sheet at Images in line and at the same distance.


                Regards, Alois


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                • #9
                  Also, Is this a CMYK Job or Pantone colors? Whats the color sequence?
                  Asif Qazi
                  www.facebook.com/printindustry

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                  • #10
                    The “wash marks” do not appear in other jobs.
                    This is a 6up layout so it is at different positions on the sheet.
                    it is a pms 7488 color
                    I don’t think this is a water bump
                    It only effects about 1mm into these 1/2” squares
                    click on photo provided to enlarge, you’ll see it on the leading edge

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                    • #11
                      is the image large enough to get a densitometer aperture on it? Does the densitometer readings from gripper to tail confirm what your eyes are telling you?
                      Have you viewed the sheet on a different plane?

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                      • #12
                        Too small for a densitometer
                        these are only a 1/2” x 1/2”
                        optical illusion? No, it’s definitely there

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                        • #13
                          Dont know if that helps, let ink form rollers oscillate, could be ghosting

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                          • #14
                            Went through all variations of oscillation and point of charge.

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                            • #15
                              Originally posted by Yuellig View Post
                              The “wash marks” do not appear in other jobs.
                              This is a 6up layout so it is at different positions on the sheet.
                              it is a pms 7488 color
                              I don’t think this is a water bump
                              It only effects about 1mm into these 1/2” squares
                              click on photo provided to enlarge, you’ll see it on the leading edge
                              What's the color sequence, in my opinion it can be an ink tack issue.
                              Asif Qazi
                              www.facebook.com/printindustry

                              Comment

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