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How can I undercoat white under one part of an image?
Recently bought a Mimaki JV3-160SP with white ink capabilities. Have run a few tests but a little dissapointed with the opacity of the white.
Has anyone else used the same system?
How can I undercoat white under one part of an image but leave a different area without white?
I am using Shiraz RIP
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6 Replies
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i would have thought a bit early to buy a white printing machine as they still need more time to sort it. roland have it but as you say a bit weak. as i understand it. print the bits you want white with the rip told to return to 0.0 after printing then print your image – on revereced clear the other way round. eg white last – i think the industry want it but not yet sorted.
chris
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As we print alot of reverse print decals we thought the white would be a welcome change from having to laminate white material to the reverse of clear.
But the ink really doesn’t do what we’d have hoped.
Don’t know if you’re familiar with the Shiraz RIP but there’s an option to control the white level (1/2/3) which doesn’t seem to make much difference. There’s also an overprinting feature but this affects all inks not just white, I increased the overprint to 4x (limiting other colours except white) which gives better opacity but still not great (but now ceates a print speed of over 3hrs per square meter!!!
Not sure how to get the printer to return to 0.0 – I’ll have to have a hunt around!
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i have seen the adverts for the white… but not understood how they have done it… as Chris said…
Does the JV3 print colour in mirror image on to clear
Then returns to the start (position 0,0)
Then prints the White OVER the prevous print.is that how it works?
I am shiraz / jv3 user.. but i have jv3 that cant use white.
again, white only just recently come out, I am not expecting miracles as I suspect you need a good couple of layers of white to make it thick looking at it from a silk-screen perspective. -
Where do I start?
Well, there are 8 heads (1 for each ink CMYKlclm+2whites).
I’m not sure how many nozzles there are in each head we’ll say 10 for arguments sake with nozzle 10 being nearest the back of the machine and nozzle 1 at the front.
When the carriage moves over the media it first lays down the coloured ink from nozzle 10 of their respective heads. The media is then fed through and once the printed colour is under nozzle 1 the white will be printed directly on top.
It’s a bit more complicated than that I think but that’s the only way I could explain it without pictures!
As far as layers go I’m using 4 at the moment and it still isn’t thick enough, I can do more but it’ll probably end up with a very deep puddle of white ink on the floor!
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thank you for that information so what are the chances of the white going on to wet coloured ink.
chris
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ah. so thats how it works… so yes its wet on wet…
i would have though that back-whiting would require a lot of white ink as in screen printing u do need a good wide mesh with a good elumsion buildup to create a strong white block.
Saying that, I wouldn’t be expecting anything like silkscreen or backing white onto the print…
sorry not to give any tips but I think ur the first white-ink user here
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