printing dot percentages below 20%

Discussion in 'Komori Printing Presses' started by david define, May 24, 2013.

  1. david define

    david define Member

    Oct 2011
    Durban, South Africa
    hi, we are running 2 Komoris, one is the LS 540, a 5 colour with coating which
    we run using alcohol in the water. the second machine is a K440 p perfector
    which we run as an alcohol free press. We are happy with our colour
    curve tests for which we use Pressign 2, although outdated it still gives a good
    indication of how the presses are printing and we are happy with the results. The
    problem we have is that we will get a score of 94% to 97% which is great,but then
    when we measure the 2%, 5% and up to 20% dots using a techkondens those percentages
    show readings which are out of tolerance ie;2% would have a 7% and a 5% would
    read as 12%. All the dots above 20% on both presses are good and within tolerance.
    Any ideas on why we are getting such a gain on the lower percentages on the print?
    We use Agfa P970 Thermostar plates and the processor is a PTR8800, when reading
    the dots on the Linear plates they read true to what they should be, but once
    on the press we get that gain on the lower percentages. HELP!!!!!!!
    Last edited: May 24, 2013