Need Help Fish eye problem, white spots white dots, satellites you name it. Please help!

[avdodooel]

Hi. I was wondering if you could help me. I am using roland fj-52 coverted to eco solvent with bulk ink system. The printer started to show white dots named fish eye every where on a print when there is a lot of ink like solid black blue red...If i set the plate temperature on 65 C degrees and post heater to 50, the white dots go away 90% but the media curls and there is a problem with the print head touching the monomeric vinyl and ruining the print.
I cleaned the media, both dry cleaning and with alcohol. No improvement.

Where to look. Why do i need all that high temperature to print? Is this normal temperature? I guess not?
Any suggestions?

 

[Gino]

Looks like media contamination. You also have some nasty banding, too. What kinda vinyl are you using ?? Perhaps some low end stuff ??

 

[equippaint]

Possibly a bad/contaminated batch of media? Print on something different and see what happens

 

[avdodooel]

Looks like media contamination. You also have some nasty banding, too. What kinda vinyl are you using ?? Perhaps some low end stuff ??

I tried cleaning the monomeric vinyl, with alcohol and without alcohol. Nothing changed! I used another brand new roll, same thing. The only way i dont have white spots (at least that much) is when i print on 1440dpi, but that is wayyyyy slow printing and the vinyl heats up and curls.

And for the banding, i have it on 540dpi and sometimes on 720dpi. I tried calibration via the printer that didnt fix it. I dont have visible banding if i print on 1440 dpi but then i have media curling.......\

HELP>?

ps-The media is 80micron intercoat german (cheap) monomeric vinul

 

[Gino]

I tried cleaning the monomeric vinyl, with alcohol and without alcohol. Nothing changed! I used another brand new roll, same thing. The only way i dont have white spots (at least that much) is when i print on 1440dpi, but that is wayyyyy slow printing and the vinyl heats up and curls.

And for the banding, i have it on 540dpi and sometimes on 720dpi. I tried calibration via the printer that didnt fix it. I dont have visible banding if i print on 1440 dpi but then i have media curling.......\

HELP>?

ps-The media is 80micron intercoat german (cheap) monomeric vinul

Over in this country, the saying is..... 'you can't polish a turd'. I think the vinyl you're using is not for digital printing, first of all...... and I don't think it's a good grade of whatever it is, either. You mentioned cheap. There's your next clue.

Can you tell us the name, like Avery, OraCal, 3M..... ?? A no-name generic vinyl tells us nothing. when you have to put it up to full steam to eliminate most problems, that's just more ink going down, covering up some problems on the media. I don't know how old the machine is, but once they've been converted, they will eventually start slipping and little problems will start creeping into the scenario on top of cheap media.

You have a lot going against you at this point, but you have so many areas of possible problems, it's hard to know where to start.

 

[papabud]

what gino said plus if your working in an environment with dust you will never make a good print

 

[avdodooel]

Over in this country, the saying is..... 'you can't polish a turd'. I think the vinyl you're using is not for digital printing, first of all...... and I don't think it's a good grade of whatever it is, either. You mentioned cheap. There's your next clue.

Can you tell us the name, like Avery, OraCal, 3M..... ?? A no-name generic vinyl tells us nothing. when you have to put it up to full steam to eliminate most problems, that's just more ink going down, covering up some problems on the media. I don't know how old the machine is, but once they've been converted, they will eventually start slipping and little problems will start creeping into the scenario on top of cheap media.

You have a lot going against you at this point, but you have so many areas of possible problems, it's hard to know where to start.

The media is from the brand Intercoat, it is 80microns monomeric calendared pvc vinyl, glossy. I dont have white spots when using canvas...but i quess its because the material is rigid. I dont know. What to check? Where to starts? Isnt 65C temperature on the plate too much? anything below 65 i have the white spots...

 

[kapitenio]

Avdodooel find any solution?

 

[Roland Product Support]

Hey Kapitenio,

We're published a guide for troubleshooting fisheye and you can access the document on our website here: http://support.rolanddga.com/docs/d... services/manuals and guides/rtg_fisheyes.pdf

We hope this helps in some way and take care!

Roland Technical Support

 

[AKwrapguy]

It could also be a static issue. Even if you wipe it down, as the material is going through the machine it could be (probably is) building up a static charge that is attracting dust and messing with the ink. I had a similar issue with my Mimaki. Get a humidifier and set it up close to the machine and let it run for a few hours.

 

[avdodooel]

Fixed it, it was temperature issue, i had to preheat the material before i was printing. It was around 15c in the room

 

[Gino]

Good for you, but are you still testing on that original roll of vinyl ?? I would've thought by now, you'd be on a second or third new roll of vimyl.

 

[avdodooel]

Good for you, but are you still testing on that original roll of vinyl ?? I would've thought by now, you'd be on a second or third new roll of vimyl.

On the same vinyl, and on other vinyls if i dont preheat it with external heater i will get sattelites. Maybe cause of room temperature being too low.