What Causes This?

[signguy35]

Every now and then I'll get this in my prints. Vs640. What causes this? It seems random. Thanks

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[Cynosure]

Every now and then I'll get this in my prints. Vs640. What causes this? It seems random. Thanks

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I get that on my vs540 from time to time. I believe its when the machine does a "clean" during printing or refills the lines....thats what my sales rep told me. Could have just been an excuse for "I don't know"

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[allblack]

It makes no sense, roland won't perform cleaning during printing process. signguy35 are you using media clamps? It happens randomly on any media or only this particularly one.

 

[signguy35]

No clamps, only time it will clean is when I put new ink in, this print was not one of those times

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[signguy35]

Has been on both vinyl and banner.

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[excelerator]

Did you pause the machine while printing at that point? I have XR-640 and if paused during printing, that light patch will have. Someone told me it was because you were no longer printing ink into a wet edge...Like painting your walls. We no longer pause any prints during printing.

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[signguy35]

I don't pause either and I'm 99% sure I didn't have to refill a color.

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[Malardalensbildekor]

I had this problem aswell, mostly its some colors that are difficult to print, when i get this problem i rasterize the layer with the problematic color and reprint, 99% of the time this solves the problem

 

[excelerator]

Is it a tape mark?

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[Behrmon]

Did you pause the machine while printing at that point? I have XR-640 and if paused during printing, that light patch will have. Someone told me it was because you were no longer printing ink into a wet edge...Like painting your walls. We no longer pause any prints during printing.

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I thought this as well bu normally for us this patch would be darker rather than lighter due to a puase sitting in the outplut platten.

 

[signguy35]

Is it a tape mark?

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No its not tape

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[Garama]

Are you using a takeup reel? If so, i could be a slight pulling on the material when it activates and starts rolling it up. Is it happening within the 1st 3-4 feet?

 

[Mike Paul]

Depending on which way it runs, it looks like the material is rippling slightly during printing from too much heat.

 

[Joe House]

I agree with Mike Paul, but I've also seen static electricity cause that. If your humidity is low, static can build up and cause banding - it's really erratic in how it behaves.

 

[shoresigns]

If you didn't pause it at that point in the print, is it possible you switched the head height?

 

[ChaseO]

Maybe where your vinyl was touching the bars? Does it happen more than once in any print, or just occasionally in the first few feet?

 

[Vheissu]

Same issue with VG-640. Had to have a tech come in.

Here are the service notes from the last service visit:


REPAIR SUMMARY: Confirmed cap position was correct. Confirmed maintenance is done properly. Performed damper fill from service menu. Ink starvation is gone

 

[signguy35]

I wonder if it is from touching the bars. I don't change head height while printing and unless ink runs out mid print I never pause. Time to clean bars again.

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