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Horizontal lines

Discussion in 'Mutoh' started by msenjur, Mar 8, 2012.

  1. msenjur

    msenjur Member

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    May 21, 2008
    Slovenia
    Hello

    sometimes im getting these horizontal lines in print. I did a photo, but it doesnt cleary show them.

    I can see that ink is layed differently every second line...

    It happens occasionaly... i did strong cleaning, i maually clean head yesterday. turn up heaters...

    Probably when i will start new print these lines will be gone... as usually.

    Im just wondering why they show up???
     
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  2. vmishev

    vmishev New Member

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    Apr 15, 2010
    Please send picture of your problem.
     
  3. randya

    randya Very Active Member

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    Apr 6, 2007
    Arizona
    Sounds like chromatic banding.
    Ink is layed down in different order during each pass of Bi-directional printing.
    I.e. from right to left it may be KCMY
    But from left to right it will be YMCK.

    Printing Uni-directional will solve this issue.
    Raising or lower the heater settings can help as well, usually lowering the temps.
     
  4. msenjur

    msenjur Member

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    May 21, 2008
    Slovenia
    Vmishev: i would send a photo, but i dont have enaugh good camera! I took some photos... will post it...

    Randya:
    Yeah, uniderctional prints so slow, and i had a job, that was in hurry.... Temperature - it was set to 30 celzium... i think i cant get much lower...
     

    Attached Files:

  5. dj_elite

    dj_elite Active Member

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    Oct 26, 2009
    New Hampshire
    I have the same issues on certain colors. Seems to be mostly dark blues and greens. I havent sorted it out. Seems to happen randomly
     
  6. randya

    randya Very Active Member

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    Apr 6, 2007
    Arizona
    Hard to tell, but it looks like chromatic.
    Sometime (depending on media, environment) higher temperatures can help.

    Also important that Bi-direction alignments are good.
     
  7. msenjur

    msenjur Member

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    May 21, 2008
    Slovenia
    ok, im going throug google with this chromatic banding... I noticed, that this is pretty comonn problem with printers. Everybody are suggesting uni-directional printing as solution. ok... if you have time, its no problem... but if you are in hurry like me, than that could be a problem... but ok... lets say that is only solution i've got...

    I would like to know why some prints that i did doesnt have these bandings? It was same file, same profile, same vinyl, same temperature,...
     
  8. randya

    randya Very Active Member

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    Apr 6, 2007
    Arizona
    Environmental conditions?
     
  9. msenjur

    msenjur Member

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    May 21, 2008
    Slovenia
    i soved it by changing dithering.... i chose noice screen...
     
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