Need Help mimaki ucjv300-160 ink not sticking to vinyl

[Andrewmsmith]

after printing, the ink just peels off of the vinyl. upon recommendations from google I increased the room temperature to between 75 and 85 degrees, it seems to have helped. but in the same set of recommends is to increase the exposure to UV. I am new to UV roll to roll, and new to this printer. it was already dialed into 50% when I started using it. is there any advice on how much UV exposure to set it too. how much is too much, how much is too little?

 

[Smoke_Jaguar]

Use the profile manager in RasterLink to find a profile that best suits your material (hundreds of profiles available) and go from there.

 

[White Haus]

I'd love to see the source for that operating environment temperature range....that's insane.

What do you mean when you say it was already dialed in 50% when you started using it?

A bit more context would go a long way, hard to read between the lines of your cryptic post.

-Age of machine
-Inkset in machine
-Health of the machine (nozzle check?)
-Media having issues (have you tried other medias?)
-Have you successfully printed anything with this machine, is this a new issue?

We have the same unit and as long as there is vinyl loaded on it and the heads are firing, the ink bites to everything.

If it's firing properly (nozzle check) then it's a curing issue - something that the LED lamps should be doing, not your room temperature.

There are adjustments on the unit for lamp settings but if your ink is peeling I doubt that slight adjustment will compensate for what must be a more serious issue.

 

[Solventinkjet]

50% is technically 100% on this machine. The values go from -50 to +50. I'd try lowering it 10 points and then do a test print. If it still flakes off, lower it again and repeat. The higher the UV exposure, the harder the ink cures and is more likely to cause issues on flexible vinyl.

 

[Smoke_Jaguar]

Also, make sure you're not using ink from 4 years ago on a printer that thinks it's still 2021.

 

[Kemik]

Try a different vinyl, it may have a coating that the UV is sticking to and it's the coating that is peeling off.
I have this issue with an old roll of static cling that I had for an Eco Sol printer, the UV just peels off of it, I bought a different brand and it works great with the UV.
I've also had this issue with silver material, peels off one, sticks great to another.

 

[Axelbeta]

after printing, the ink just peels off of the vinyl. upon recommendations from google I increased the room temperature to between 75 and 85 degrees, it seems to have helped. but in the same set of recommends is to increase the exposure to UV. I am new to UV roll to roll, and new to this printer. it was already dialed into 50% when I started using it. is there any advice on how much UV exposure to set it too. how much is too much, how much is too little?

Two things could be happening: 1. Too much ink is being used on the material, which is why the UV lamps aren't fully curing it; and 2. An incorrect ICC profile is being used in Rasterlink.

 

[Smoke_Jaguar]

If using material for aqueous inks, the absorbent layer can rip right off as well.

 

[Andrewmsmith]

50% is technically 100% on this machine. The values go from -50 to +50. I'd try lowering it 10 points and then do a test print. If it still flakes off, lower it again and repeat. The higher the UV exposure, the harder the ink cures and is more likely to cause issues on flexible vinyl.

thank you. I will try this after the current print. currently I have slowed the print down to 44 pass, normal carriage speed (as opposed to fast) 600x1200. last week I ran a 20 foot print at 1200x1200 - 32 pass, normal. that was insanely slow. I am hoping to find a happy medium. I don't mind it taking a little longer. but currently this is our only printer, and the bulk of what we do is larger and back lit, so the multi layer printing is slow enough at the faster settings. if too much UV is the problem, and I can go back to fast. I will be extremely happy. I will try to let you know.

 

[Andrewmsmith]

I'd love to see the source for that operating environment temperature range....that's insane.

What do you mean when you say it was already dialed in 50% when you started using it?

A bit more context would go a long way, hard to read between the lines of your cryptic post.

-Age of machine
-Inkset in machine
-Health of the machine (nozzle check?)
-Media having issues (have you tried other medias?)
-Have you successfully printed anything with this machine, is this a new issue?

We have the same unit and as long as there is vinyl loaded on it and the heads are firing, the ink bites to everything.

If it's firing properly (nozzle check) then it's a curing issue - something that the LED lamps should be doing, not your room temperature.

There are adjustments on the unit for lamp settings but if your ink is peeling I doubt that slight adjustment will compensate for what must be a more serious issue.

It was a google compiled search result. unfortunately the search again did not render the same result. but it was recommended, increase uv exposure, slow down print, assure proper media and media profile, and increase room temp between 75 and 85 degrees F.

 

[Smoke_Jaguar]

Sounds like you need to get some samples from your supplier for something that works with your ink set. Room temperature has some effect on UV prints, but not much. Since it's a cured ink instead of relying on drying like solvent-based inks.

 

[rvolkers]

after printing, the ink just peels off of the vinyl. upon recommendations from google I increased the room temperature to between 75 and 85 degrees, it seems to have helped. but in the same set of recommends is to increase the exposure to UV. I am new to UV roll to roll, and new to this printer. it was already dialed into 50% when I started using it. is there any advice on how much UV exposure to set it too. how much is too much, how much is too little?

Use these settings in the heat function on mimaki! - room temperature has nothing to do with it the maimai has 3 heaters
PRE
PRINT
POST

as the order below indicates

Printable Vinyl normal use - (HEAD DOWN)
40C 40C 50C
95F 95F 118F OR CLOSE!

Banner normal use - (HEAD UP)
26C 30C 43C
80F 85F 110F

 

[Smoke_Jaguar]

UCJV300s are UV printers, no heaters installed.

 

[SlikGRFX]

I agree with Kemik. It’s probably the vinyl. Some vinyls have a coating or just don’t take uv ink without an adhesion promoter.

 

[Romeuh]

what Susbtract are you using?

 

[Romeuh]

UCJV300s are UV printers, no heaters installed.

actualy they have, only in the back but they have

 

[LizKeenan]

Some vinyls have scratch guards now. Do a tiny test strip you spray with alcohol and microfiber. Allow to dry and print within an hour. If it sticks it was a UV or scratch gaurs coating.