Mimaki Grainy Prints

[Mathew Atkin]

Hi,

Is it normal for certain colours too look slightly grainy like this. Machine is 2 year old running cmyk x2 the engineer who installed it said it’s normal on certain colours. If we print a cmyk pattern the colours are solid with no banding.
We run prints on 1440 with 16 pass any lower the grainy prints are far worse. The machine is a CJV150. We only use the orajet 3164 profile as its the only one the prints with a lot less graininess. The mimaki GPVC one has better colours but looks a lot more grainy. Are we printing on too low settings or should we be able to run a lower pass rate with less grain?

 

[nlnickolatos]

I found that happened on certain medias... try playing with temperature and the number of passes, if I recall right we saw that decrease at 32 pass and a high temperature.

 

[Notarealsignguy]

Looks normal to me? 32 pass, you could take a nap waiting for that thing to finish printing a bumper sticker.

 

[Mathew Atkin]

Thanks both of

Looks normal to me? 32 pass, you could take a nap waiting for that thing to finish printing a bumper sticker.

Thanks for this, We have run the machine for a couple of years like it and have always been happy with the quality. I just wasn't sure how solid the print should be. A lot of the colours are solid but some colours like orange and green are slightly grainy. I assumed it was the nature of cmyk printing. I think I will stick to 16 pass unless I'm feeling lazy and want a nap.

Thank you

 

[dypinc]

On your profiles what is the GCR set too and black start?

 

[StephenOrange]

I think your fine alignment is out. My heads are worse than yours, and I'm getting much smoother prints.

 

[Mathew Atkin]

On your profiles what is the GCR set too and black start?

How do I find this in rasterlink 6? Thank You

 

[Mathew Atkin]

I think your fine alignment is out. My heads are worse than yours, and I'm getting much smoother prints.

By fine adjustment is this the dot position adjustment on Mimaki's. If so I have run this with no improvement.

 

[yannb]

If the prints are much less grainy when you print uni-directional, then perform a ‘drop-Pos’ alignment. It is in the Setup section.

 

[7_nebo_7]

Try to print in uni-direction and check result. For me it looks too much ink on the material. Also it may related to particular media then you have to look in to temperature and color profiles. Also make sure all calibrations are done correctly.

 

[hand851]

Pre print and print temperatures are too low.

 

[Mathew Atkin]

Pre print and print temperatures are too low.

At the min they are on 45 45 50 which I think is pushing it however the media is not buckling.

 

[lubo1972]

What inks? We have same problem with our JV300 and now JV300 Plus with BS4 inks.

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[Mathew Atkin]

What inks? We have same problem with our JV300 and now JV300 Plus with BS4 inks.

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We use SS21 Inks

 

[yannb]

What inks? We have same problem with our JV300 and now JV300 Plus with BS4 inks.

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From my experience, BS4 prints more grainy than SS21.

 

[Headstrike]

Hi,

Is it normal for certain colours too look slightly grainy like this. Machine is 2 year old running cmyk x2 the engineer who installed it said it’s normal on certain colours. If we print a cmyk pattern the colours are solid with no banding.
We run prints on 1440 with 16 pass any lower the grainy prints are far worse. The machine is a CJV150. We only use the orajet 3164 profile as its the only one the prints with a lot less graininess. The mimaki GPVC one has better colours but looks a lot more grainy. Are we printing on too low settings or should we be able to run a lower pass rate with less grain?

The prints look fairly normal to me but I can assure you that media is a huge factor. I had a customer running 3M with ok-ish result.
After running every possible adjustment to make sure the printer was not the issue, we used Arlon and the same print was flawless.
You can try changing the heater's temperature but to me media is the answer.

 

[lubo1972]

From my experience, BS4 prints more grainy than SS21.

Before couple of years we change Magenta to BS3 because of bad BS4 ink that broke two heads. Technician change sonething in machine setting or firmware and our JV300 start printing red, blue and all colors that include big percentage of magenta very good without grainy look. So I suppose that ink or/and firmware for it is reason for that problem.

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[ewded]

I have the same printer, I only get this quality with 6 passes, I never do more than 12