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Vertical Banding or Grain

#1 digitalGuy 4 years ago

We have had trouble with 'solid color area’s' streaking (vertical) on Korographics Abaco Beach and Dreamscape Suede. We are printing a dominate green solid with circle patterns. Because it is across 2 different materials that tells us it may be a heat issue or at least printer related. Have you come across this before? Even if you have not, would you have advise for us?

See image

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#2 HP-MarcM 4 years ago

Hi digitalGuy,

Which printer do you have?

#3 digitalGuy 4 years ago

HP Latex L28500 is what these came off of.

#4 HP-MarcM 4 years ago

Hi digitalGuy,

Vertical banding is a IQ issue related with the temperature. All the information related with troubleshoot print-quality issues related with vertical banding are explained on the User Guide (Chapter 13; page 130 on English version). Even though, let me provide you some advises:

  • I will recommend you to print using the HP Certified profiles for your medias in case they exist. I know that for the medias that you are using, there are some HP Certified profiles. You will be able to find them at HP Media Solutions Locator.
  • Pre-warm the printer. Results are always better when the printer temperature is stable that is why usually worse with the first plots.
  • Load the substrate in the second/centre position to maintain more stable temperature along the substrate.
  • Decrease dryer temperature to minimum possible.
  • Increase the number of passes.
  • Use the inter-swath delay thru the RIP or front panel.
  • Activate the “Vertical correction” feature by front panel (Options > Ink > Image-quality maintenance > Vertical correction). Once you fixed the problem of the vertical banding I will recommend you to disable this function for other jobs.

I hope this helps

#5 --- a year ago

FDC banner. L2550. Tried many different profiles (all downloaded from HP site). HP/Hep/Optima...Been having the issue for a while. ONLY on banner, wraps print perfect. HELP

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#6 HP-MarcM a year ago

Hi spotman,

After review the picture attached we can see that you are suffering plasticizer migration on your banner substrate. Plasticizer shows up as randomly non-uniform areas with “coalescence like” graininess and increases the visibility of pinchwheel marks. Find below some recommendations:

  • The only way to remove plasticizer is to “wash it out” with isopropyl alcohol. This is not practical for printing but can be used as a diagnostic tool: by washing only part of the substrate the defects can be made appear (not washed areas) and disappear (washed areas).
  • Change printing material or, at least, the production batch of the material used (preferred the ones that have not been stored for a long time).
  • In some cases, increasing heater temperature and number of passes can reduce the effect.

I hope this helps.

Best regards,

#7 HP-MarcM a year ago

Hi Spotman,

Let me know if this recommendations have helped you.

Regards.

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