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Oce Arizona 460GT banding on foam core

Offline computerdork Posted 09-19-2015 - 08:38 AM
Post: #1
Member
4 Posts
Member

Onyx Version:
Thrive 11.1.2.103
Printer(s):
Oce Arizona 460GT, Epson 9890

Greetings!

My employer has an Arizona 460GT using IJC256 ink and has been having some problems with banding on foam core. We use Onyx Thrive as the rip.

I'm a bit new to these flatbed direct-to-media printing issues, so please forgive me if I accidentally leave out some details.

The Arizona media guide (Media Notes Rev C) suggests that they may be running the UV lamps too hot on this particular material (I think they've been using 7 on both lamps for everything), and it also sounds like the printer isn't smart enough to lower/raise the UV lamp power depending on the speed of the carriage. The problem seems to be lessened, but not solved, in faster print modes and lessened more with unidirectional printing which makes me think that maybe it's a curing speed issue.

Before I was hired it sounds like an Arizona tech recommended switching brands of foam core media but that doesn't seem to have fixed it.

I am also wondering if this is something that might be fixed or further improved by adjusting ink limits or ink restrictions.

To describe the banding further, it almost looks like swaths are overprinting by a hair as though the gantry is moving the wrong distance between swaths, but this is obviously not the case because this doesn't happen on other media. The fact that the print direction seems to affect the sheen, sort of like how a lawnmower affects the appearance of grass as it moves in alternate directions, might also be a clue.

If adjusting the UV lamp output doesn't fix the problem, what should we try next? Could this be caused by something like too much ink being deposited? What parts of the calibration/profiling should we be paying special attention to?

Thanks in advance for any helpful tips you can offer.


PS This is what the Arizona media notes say:

Quote:Over-curing can result in an increase in a kind of banding referred to as gradient banding, which is more common when printing with IJC 256 inks. To alleviate gradient banding, reduce the UV curing power either by dropping both lamp levels or by reducing the leading lamp only, add edge of swath delays or force full carriage travel.
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Offline suess Posted 09-21-2015 - 06:44 AM
Post: #2
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5 Posts
Member

Onyx Version:
12.0.0.170 - test dummy
Printer(s):
2 - Oce 550XT / 2 - HP 370 / HP L26500 / GS600

We had a similar problem with a different vendors foam core. I was able to resolve it by adjusting the lamps and putting the lead lamp on 5 and trail on 7.
When I used our normal stock foam core I had no issues with 5 and 5 or 7 and 7.
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Offline Mikulas Posted 09-21-2015 - 04:07 PM
Post: #3
Banned
55 Posts
Banned

Onyx Version:
10.2
Printer(s):
L26500, W8400+Onyx / Mimaki JV4, JV5 +TexPrint

Such banding often is caused by not compatible or cheap media/coating, or by high temperatures (UV intensity in you case). The physical reason behind is - inks are not able to mix together well, and they produce bad "rendering".
Less temperature (or UV light) gives more time to cure, better coating keeps the inks better on surface.
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Offline computerdork Posted 09-21-2015 - 06:09 PM
Post: #4
Member
4 Posts
Member

Onyx Version:
Thrive 11.1.2.103
Printer(s):
Oce Arizona 460GT, Epson 9890

Thanks. Do you have any specific recommendations for foam board manufacturers/products?

I'm having a hard time finding a full list of foam board products that are specifically made to be used with UV ink flatbed printers.
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Offline Pauly Posted 10-01-2015 - 12:34 AM
Post: #5
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109 Posts
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Onyx Version:
12.0
Printer(s):
Oce Arizona 480XT

in the printer settings, there should be a delay for after each print pass. add a few seconds on the delay and see if it does anything.
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Offline Mikulas Posted 10-02-2015 - 04:55 AM
Post: #6
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55 Posts
Banned

Onyx Version:
10.2
Printer(s):
L26500, W8400+Onyx / Mimaki JV4, JV5 +TexPrint

rather than second add milliseconds... LOL
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Offline Pauly Posted 10-04-2015 - 05:35 AM
Post: #7
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109 Posts
Frequent Flyer

Onyx Version:
12.0
Printer(s):
Oce Arizona 480XT

Haha, this is what my tech told me about a customers Arizona was experiencing banding.
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Offline computerdork Posted 10-28-2015 - 10:18 AM
Post: #8
Member
4 Posts
Member

Onyx Version:
Thrive 11.1.2.103
Printer(s):
Oce Arizona 460GT, Epson 9890

Adding 3 seconds ends of swath delay AND unidirectional printing helps signifiantly but this adds way too much delay and doesnt even solve the problem 100%. It also slows down printing beyond an acceptable level for our workload on most days.

The banding is rather slight anyway, not enough for customers to complain but enough to bother us perfectionists.

There are slightly visible edge of swath lines on other media too, and unidirectional printing seems to improve it so I'm starting to suspect that we need a bidirectional print head alignment adjustment.
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Offline Mikulas Posted 11-04-2015 - 01:56 PM
Post: #9
Banned
55 Posts
Banned

Onyx Version:
10.2
Printer(s):
L26500, W8400+Onyx / Mimaki JV4, JV5 +TexPrint

Banding is a problem with vertical homogenity.
Bi-Dir timing is horizontal adjustment.
These are both very different things. Sad

The banding you have is caused by bad mixing of inks. Wink (90% chance)
What you see as banding is difference in color between left-pass and right-pass, and the reason is - ink order put down on media. From one side you have CMYK, and going back you have KYMC. If ink are not mixed well, the ink put down on media as last "wins" some priority.

Second option (10% chance) is - your heads have some problem with ink supply. Bi-Dir needs more ink (every pass is printing). Printing Uni-Dir gives longer time between passes, and helps to fill more ink.
There are/were some machines (some Rolands for example) that are not able to get rid of this problem at all.

Of course - you should check the health of your heads again, and also check the media feed settings.
(This post was last modified: 11-04-2015 02:03 PM by Mikulas.)
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Offline Pauly Posted 11-20-2015 - 05:13 PM
Post: #10
Frequent Flyer
109 Posts
Frequent Flyer

Onyx Version:
12.0
Printer(s):
Oce Arizona 480XT

Ok what print mode are you using?
express, production sq, production round (i think), quality, fine art, hd?
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Offline ytlab Posted 12-11-2015 - 07:44 AM
Post: #11
Member
1 Posts
Member

Onyx Version:
thrive12
Printer(s):
Océ Az 480GT

Hello I have the same problem here when printing on white laquered aluminium ( Dibond).


I use HD mode set the UV lamps to minimum settings 5 front /5 rear (even shutting off the leading lamp)
The banding is very visible in black areas. ( It's like the vertical moving is not precise enough -a bit like if I have to adjust the MACD on roll media...)
I dont have this problem when i print in Fineart mode but I have HUGE dots not acceptable for the kind of work we do ( 90% photography) which is weird because on other media, fine art setting is perfectly fine.

Any suggestions ?

Regards,
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