Riso GR image banding/noise at intervals on side of prints (in master)

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  • directanglepress
    Junior Member
    • Oct 2016
    • 9
    #1

    Riso GR image banding/noise at intervals on side of prints (in master)

    Hi all,


    The teal print was made on my second machine, a GR3770. You can see a slightly different version of this problem happening on the left edge here as well.


    Thoughts? Many thanks in advance!

    Best,
    Josh


    IMG_6661.jpg IMG_6662.jpg
    Tags: it’s, print, roller, side, write
    • jermyth
      Riso dude

      250+ Posts
      • Mar 2011
      • 431
      #2
      Re: Riso GR image banding/noise at intervals on side of prints (in master)

      It looks like the print pressure is uneven. If the impression roller is new, then the actual pressure applied is uneven. If you have a GR manual it's in there somewhere on how to check and adjust. I just don't have mine handy at the moment.

      Good luck.

        Comment

        • itchyfinger@att.net
          Technician

          50+ Posts
          • Oct 2017
          • 77
          #3
          Re: Riso GR image banding/noise at intervals on side of prints (in master)

          I would think impression roller or pressure. you say if switch drums it follows because its the master..I would try making a new master on each machine and see if it is the same on both machines. if it is then it is in your ink cylinder.

            Comment

            • NeoMatrix
              Senior Tech.

              2,500+ Posts
              • Nov 2010
              • 3514
              #4
              Re: Riso GR image banding/noise at intervals on side of prints (in master)

              Cut a blank master, stop the machine, remove the drum and see if the master is cut with the problem pattern.
              Inauguration to the "AI cancel-culture" fraternity 1997...
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                Comment

                • directanglepress
                  Junior Member
                  • Oct 2016
                  • 9
                  #5
                  Re: Riso GR image banding/noise at intervals on side of prints (in master)

                  Thanks for your input everyone! I looked over the machines with a tech yesterday and we ruled out the drums and pressure rollers, as the printing issue occurred the same way between both machines, but when a new master was made on the second machine the printing issue would go away.

                  We've concluded that the Write Roller on my GR3750 is worn, and were actually able to feel a bit of unevenness. This also is consistent with what the tech manual says about 60mm intervals of blurring/banding being symptomatic of a write roller issue.

                  These parts are no longer available, so I gave a call to a roller company I work with for recovering letterpress rollers in my studio. It sounds like they'll be able to match the specs of the write roller and make a new one for me. We'll see if that addresses the issue.

                  Thanks again!

                    Comment

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