Visible "splotchiness" in print

Warranties, repairs and maintenance
Lizardface
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Visible "splotchiness" in print

Post by Lizardface » Thu Jun 01, 2017 4:33 pm

I am running two LEF 300 printers, and one seems to be performing fine, while the other is producing prints such as this:

I had a hard time getting a picture, but there is visible "zebra striping"
I it seems to be laying down ink inconsistently. We feel as if it may be the vertical alignment of the head, but we are not sure - I need to get this press up and running and our tech is currently out of province.

this should be producing a solid color - i've edited the photo a little to make it more apparent, but especially in the center of the photo, you can see it is clearly a different color than the rest.

any idea why this might be happening, or how to fix it?
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image1.JPG
striping

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mrtn
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Re: Visible "splotchiness" in print

Post by mrtn » Thu Jun 01, 2017 4:39 pm

9 out of ten cases it's cleaning agent residue (or surface consistency issues) from wiping the object.
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Lizardface
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Re: Visible "splotchiness" in print

Post by Lizardface » Thu Jun 01, 2017 4:42 pm

mrtn wrote:
Thu Jun 01, 2017 4:39 pm
9 out of ten cases it's cleaning agent residue (or surface consistency issues) from wiping the object.
this makes sense. If it happens to be cleaning agent residue, how do I go about fixing this issue? Warm water? Rubbing Alcohol?

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mrtn
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Re: Visible "splotchiness" in print

Post by mrtn » Thu Jun 01, 2017 4:44 pm

Alcohol, primer or just a good rub with a rag like cleaning a mirror, depending on the material.
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Lizardface
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Re: Visible "splotchiness" in print

Post by Lizardface » Thu Jun 01, 2017 6:12 pm

could it possibly be something to do with inks needing to be shaken? I shake the white every day and it doesn't have any issues, but the CMYK heads seem to be acting up.

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mrtn
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Re: Visible "splotchiness" in print

Post by mrtn » Thu Jun 01, 2017 7:48 pm

No, definitely not.
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Lizardface
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Re: Visible "splotchiness" in print

Post by Lizardface » Thu Jun 01, 2017 7:55 pm

what about this?

We have entered service mode and ran a "Fill" test print
this was our result.

it was not visible at first but that was because the UV LED's were not on. Once they turned on, the issue with these streaks started to appear.

We are sort of leaning toward a curing issue at this point. I know the lights have a 20,000hour lifespan and at just over a year old the lamp age shouldn't be the issue as far as I know.
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mrtn
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Re: Visible "splotchiness" in print

Post by mrtn » Thu Jun 01, 2017 7:58 pm

This is normal in fill test. Fill jets more ink than in regular print mode.

You have no reason to worry unless the issues appear in all prints on all materials.

Try running both printers at the same time on the same material side by side.
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Lizardface
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Re: Visible "splotchiness" in print

Post by Lizardface » Thu Jun 01, 2017 8:01 pm

it does. The issue isn't as severe, but it is appearing on all materials we are printing on and causing a large loss of parts.

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mrtn
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Re: Visible "splotchiness" in print

Post by mrtn » Thu Jun 01, 2017 8:17 pm

Have you cleaned the lamp surface regularly?
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