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Scratching on prints for L26500

Discussion in 'Hewlett Packard' started by Redfield, Feb 12, 2013.

  1. Redfield

    Redfield New Member

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    Feb 7, 2013
    Got our L26500 printer back in January of 2012. In December I started having issues when printing with 60" and 54" 3M controltac and translucent vinyl. Nearly every print job now has what looks like scratching in the middle of the machine. It varies from where it happens during printing, beginning, middle, or near the end. I use the take up reel with the metal tension bar and I've increased the vacuum pressure up 10 points, more in some cases. It’s been hit or miss. I've also checked the holes on the platen to make sure they aren't clogged. HP techs usually are pretty good but this one but they just told me to do what I’ve already listed above. I'm stumped and it’s becoming a waste of material.Anyone else seen this?
     

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  2. J Hill Designs

    J Hill Designs Major Contributor

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    just a guess, but I'm thinking that the media is tunneling causing the head to swipe the media... perhaps lower your heat a titch?
     
  3. P Wagner

    P Wagner Very Active Member

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    Aug 16, 2006
    San Diego
    Are those caused by the print carriage impacting the media, or from the use of the dancer take-up take-up system?

    Assuming that a print head crash is the source, I would look at the humidity of your print room. This time of year it is common for humidity to fall below the minimum (25%) and this can cause paper-backed media (including adhesive vinyl) to buckle while printing.
     
  4. Redfield

    Redfield New Member

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    Feb 7, 2013
    jhilldesigns:

    The heat is at the default setting for the profile so I don't know if I should lower it.

    Castek:

    I believe its the carriage scratching the media. I have used the take-reel with the metal tension bar and without it. The humidity is down to 20% in the room.
     
  5. Turtle

    Turtle Member

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    Feb 9, 2010
    Head strike
    Try this
    dry temp 126
    cure temp 215
    vacuum 25
    The low humidity is not helping either.

    I was having a similar problem last week My vac was at 15 and raising it to 25 helped the most.

    Good Luck

    -Mark
     
  6. JoeBoomer

    JoeBoomer Member

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    Oct 28, 2009
    It looks like a head-strike. I think your temps are in fact too high and the media is buckling. Try dropping it by 5º and see if that works. Just check it as it is coming off to see if it is "oily" at all. I might even go as far as to drop it by 10º.

    • Decrease temp
    • If lower temp is a problem, keep temp low and try increasing airflow

    You'd be surprised how much room you have with temps sometimes.
     
  7. sowinski_t

    sowinski_t Member

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    Nov 22, 2011
    Almost for sure a head strike due to buckling from too much heat or not enough vacuum. Also, I would check to see if by chance there isn't any hanging from the carriage and scratching; unlikely, but possible.
     
  8. Redfield

    Redfield New Member

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    Feb 7, 2013
    I use the default profile for IJ180 which is:
    dry temp 131(max)
    cure temp 230
    vacuum 25

    I increased the vacuum to 30-35 and usually does the trick, but not always.

    I haven't tried decreasing the temp, wasn't sure what it would do for drying. I had to increase the temp for high ink prints.

    Also, the only place it scratches in in the center of the machine.
     
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