White dots/splashed when printing UV Printer

[Sebas3245]

Hi, I have a UV flatbed printer Erasmart UV A5 that has an epson L800 printhead, I had problems before and had to change the printhead and suction pump, now it seems that white dots come out when printing on clear acrylic, does anyone know what could be happening?

Clarifications:
- Use Acrorip
- They appear in parts of the material where nothing is printed.
- More white dots appear if I select “Mix” or “Medium” in the white drop size instead of “Large” in Acrorip.
- I have already printed on clear acetate and clear adhesive paper and white dots also appear.
- More white dots appear on the part of the material that is closer to the suction station.
Near the suction station there seems to be a lot of white ink splashing.
- I have already checked the height (the printer detects it automatically).
- The nozzle test is generated correctly
- I have noticed that the printhead, even if I clean it manually, is always left with a line of white ink drops.
- Sometimes after printing I see a white drop on the printhead.
- I have manually cleaned the printhead several times to verify that it is not dirt.
- In general it prints well and there is NO white overspray around the text or images.
- When printing on black cardboard there are no white dots.
- In general there are several parts of the printer that have white ink splashes.
- The white splatter does NOT seem to appear on top of the image being printed, only on the rest of the material.

 

[VizualVoice]

are you 100% certain that's not something in the file? What is the file format and what was it created with? Like the background isn't completely empty and has a few light colored pixels here and there that the rip is interpreting as needing the white underbase? That's kind of what it looks like to me FWIW. Does this happen with other files?

 

[Sebas3245]

¿Estás 100% seguro de que no hay nada en el archivo? ¿Cuál es el formato del archivo y con qué se creó? Por ejemplo, el fondo no está completamente vacío y tiene algunos píxeles claros aquí y allá que el rip interpreta como si necesitara la base blanca. Por cierto, eso es más o menos lo que me parece. ¿Pasa esto con otros archivos?

Yes, the file is in png and in acrorip it looks totally empty all around, in fact the dots are quite random.

 

[VizualVoice]

I don't know anything about acrorip. I just know that I've experienced similar things before with what I thought was an empty PNG file or a solid white, but when it printed I got unexpected results. You didn't mention if it happens to other files with a clear background, I would try that. Narrow it down to a printer problem or a file problem. That should help your troubleshooting.

 

[Ronny Axelsson]

Print the same file (or a part of it) twice and compare the dot pattern.
Is it identical, then the problem is in the file, if not, maybe static electricity?