Banding Issue

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em555
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Banding Issue

Post by em555 » Wed Mar 14, 2018 8:26 pm

Evening,

I'm having an issue with banding on my Roland VS540i. Having recently had some problem with grainy prints I've had everything cleaned, aligned and all seems to be working well. Nozzels fine etc.

I'm currently printing some roller banners with a dark background and today noticed some banding. I've been using an AGFA grey back roller banner material, usually printing on the Generic Banner 1 setting in Versaworks.

I ran some tests on the same background / material today with various results:

- General Banner 1 - Standard Quality - some banding noticable
- Generic Banner 1 - High Quality - no banding with quality a lot better
- Generic Banner 2 - Standard Quality - slight banding, colour a lot more washed out looking and slightly fuzzy

I've raised the printing and drying temps which hasn't seems to make any difference.
Over all the banding only seems apparent in the 'Standard Quality' mode so I'm not sure if this is a profile / settings issue?

Any suggestions would be great.

Thanks,
Chris

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mrtn
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Re: Banding Issue

Post by mrtn » Wed Mar 14, 2018 9:56 pm

Did you perform feed calibration?
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em555
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Re: Banding Issue

Post by em555 » Thu Mar 15, 2018 3:12 pm

Hi Mrtn, yes feel calibration has been performed and adjusted to suit. Banding is still visible, I have tried both bi-directional and uni-directional.
The uni-directional on standard mode is slightly better, however on high quality there is virtually no banding.

Thanks

em555
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Re: Banding Issue

Post by em555 » Mon Mar 19, 2018 10:57 am

Following on from last week - I printed some banners on Friday afternoon with no problems, great quality and sharp. I've just started another few of the same banners this morning and I'm having some issues.

It seems as if anything printed vertically is very poor quality and also a slight red mist / over-spray around it in parts. I've attached some photos to give you an idea.

I've ran some calibration and alignment tests and adjusted the settings slightly to no avail. Any suggestions as to what would cause this?
An engineer advised last week I could do with changing my cap top so I've one ordered.

Note: On the last image - The vertical line should be identical to the horizontal line.

Thanks
20180319_095259_resized.jpg
20180319_095249_resized.jpg
20180319_095159_resized.jpg

em555
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Re: Banding Issue

Post by em555 » Mon Mar 19, 2018 11:25 am

Quick update: Manual clean made a massive difference which is now usable, however the vertical line is still not as sharp as the horizontal with a tiny hint of red.

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mrtn
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Re: Banding Issue

Post by mrtn » Mon Mar 19, 2018 12:47 pm

Check the head height and perform "BI-DIR ADJUSTMENT".
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em555
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Re: Banding Issue

Post by em555 » Mon Mar 19, 2018 1:48 pm

Hi Mrtn, the head height is set to low as always. I had also performed the BI-DIR ADJUSTMENT before the manual clean.
It seems I'm having to do this more often, it did help slightly though.

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Ryan Anderson
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Re: Banding Issue

Post by Ryan Anderson » Mon Mar 19, 2018 7:38 pm

You should be performing the bidirectional adjustment when changing to a different media for best quality.
It is designed to adjust the print heads firing timings on the return pass, different thickness' of medias will require different values.
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em555
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Re: Banding Issue

Post by em555 » Mon Mar 19, 2018 8:49 pm

Thanks Ryan. I've been using the same media for a few days now. This issue literally came about after printing fine on Friday.

Have you any suggestions as to what may fix the issue of poor quality on the vertical sections of print?

Thanks

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Ryan Anderson
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Re: Banding Issue

Post by Ryan Anderson » Tue Mar 20, 2018 5:23 pm

The bidirectional adjustment should help with that.

Try doing the detailed bidirectional adjustment which is in the bidirectional menu option. That allows for more fine-tuning of the results.
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