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Mimaki cjv30-160 printing prob

Discussion in 'Mimaki' started by psy, Jul 11, 2012.

  1. psy

    psy New Member

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    Jun 19, 2012
    Hi Please can some one help.
    Iv tryed varies profiles in mimaki rip software.
    Iv turned the heat off and in steps up to 50 degrees.
    Iv changed the media.
    Tryed 1pass and 2 pass
    Tryed bi and uni print.

    Any help will be much appropriated.

    Thanks

    20120712_100043.jpg
     
    Tags:
  2. Scott Reynolds

    Scott Reynolds Active Member

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    Feb 5, 2005
    What is the question?

    EDIT - Ha, I just sat up in my chair and looked at my monitor straight on so the screen wasn't dark. I thought it was a reflection on my screen. I see now what your talking about. Im a dork. :Big Laugh
     
  3. psy

    psy New Member

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    Jun 19, 2012
    Hi Sorry.

    Im getting banding as if printing lighter every 100mm and then back to normal as seen in the picture.

    Is there any thing i can do to stop this?

    Thanks
     
  4. Scott Reynolds

    Scott Reynolds Active Member

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    Feb 5, 2005
    Feed Calibration? Does it do it with higher passes?
     
  5. psy

    psy New Member

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    Jun 19, 2012
    Yeah same thing.

    Maybe its the encoder strip.
     
  6. ironchef

    ironchef Very Active Member

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    May 1, 2012
    Miami, FL
    Is it the same for different media? Or only that specific roll?
     
  7. psy

    psy New Member

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    Jun 19, 2012
    Same for different all media.
     
  8. SightLine

    SightLine Very Active Member

    Adjust the Feed Compensation and how long since you have run a Dot Position Correction? We do that about once a month. I'm assuming the nozzle test print looks perfect?
     
  9. genericname

    genericname Active Member

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    Feb 27, 2009
    Canada
    I just sort of assumed everyone with a Mimaki had this happen with their light blues. 360x540 at 6 pass, no problem. Anything including and above 720 though, no dice.

    Edit:
    For a bit of context, keep in mind that we do everything at high-speed, in unidirectional mode. Slow doesn't seem to change a thing, and bidirectional just brings up the other nightmare of chromatic banding. Also note that I've done all alignments, calibrations, and profiling myself (and well, thank you very much!)

    Edit edit, redux:
    Only way I've alleviated it when absolutely needing to print at 720 (usually for vinyl), is to lower the temp. There's a sweet spot though; too low, and the banding gets worse.
     
    Last edited: Jul 12, 2012
  10. sha

    sha Member

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    Apr 1, 2009
    There is a two possible solution to your problem:

    1. In Setup >Type 1-4> Feed Speed Level -Set this option to 70%
    This will smooth the feed movement.
    This option only works with uni directional printing.

    2. CJV printer have very strange material on pre-heater and dryer surface.
    It sometimes make material sticking on it and feed motor is struggling to move it and than you get that type of banding as on your picture.

    Counter measure for this is: Try to find Teflon self adhesive tape and stick it over the pre- heater. It will not reduce your temperature and your media will glide nicely over the pre-heater.

    Good luck
     
  11. ironchef

    ironchef Very Active Member

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    May 1, 2012
    Miami, FL
    I have a new cjv with no problems at all.
     
  12. Neil

    Neil Member

    I get similar problem with my CJV when printing some blues and purples.
    See attached. Haven't found a solution yet - not that I've tried much.
    It's only with certain colour shades.
    Changed passes, speed, temps, converted from vector to bitmap...still does it.

    If you're under warranty, try to get an answer from Mimaki...
     

    Attached Files:

  13. ironchef

    ironchef Very Active Member

    1,293
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    May 1, 2012
    Miami, FL
    What media are you guys using. You said all your rolls but are they all the same brand?
     
  14. genericname

    genericname Active Member

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    Feb 27, 2009
    Canada
    Different media, and different brands.

    All media and brands give us issues with light blues, purples, and very few shades of green. Blues are an extra problem with our pressure sensitive vinyl, but that's more due to using a higher resolution on it than other media. Higher rez = more well defined banding.

    Same as above poster; heat does nothing, feed rate does nothing. Blues just suck.
     
  15. DiPrinter_com

    DiPrinter_com New Member

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    Nov 5, 2012
    Hi to all,
    doe's your printer have an unwinding system?
    If yes release roll of media and observe what happened then.
    Media feeding is more visible on gradients like 40-60% of color.
    Colour is very sh..tty to print, and media are sensitive to light blue colour.

    Regards,
    Piotr,
    info@DiPrinter.com
    www.DiPrinter.com
     
  16. gcn9800

    gcn9800 New Member

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    Mar 30, 2013
    Mimaki cjv30 color shift

    I've had almost perfect color matching using the same profile for the past 6 mos. For not obvious reason there now is a color shift to a sli lighter shade in all colors which can be corrected by adding some black in the color curve. I haven't changed inks and the machine seems to be working well otherwise. Any thoughts? Thanks!
     
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