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PC60 Banding
Here’s a good one.
We have a PC60 which we love (ahem) but recently has started banding only on the Spot Colours. CMYK are usual sytandard.
We have cleaned using the sheet etc, moved the cartidges around (works sometimes!!!!! and have yet to reort to the Last Reosrt of kicking it.
Kevin
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6 Replies
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Is the banding between passes or in a pass If between it would be to do with the thickness of the material if in a pass seems like head damage
Goop
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as you say cmyk ok then –
not all spot colours print on to all makes of materials and are more temremental than cmyk.are you using the corect cart code and telling the driver what what or tricking it some other way as the head temps are changed for different colours
chris
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As Chris says, some spot colours react in different ways to different materials 😕 What software are you using with it?
Cheers, Dewi
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same thing happened to me last week….and i thought the worst 😮
i changed all the cartridges & yeh presto back to normal!! 😛
it must have been the ribbons 😀Nik
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I’ll shut up then !!
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The banding will be due to 2 things mainly
1) pitch alignment , IE the “overlap” between passes can go out for various reason , material thickness changes , dirty feed rollers or grit roller , hardened rollers etc. A good clean of the roller system should help , if the machine is oldish , replacing the rubber rollers is a good option especially if they have “flat spotted” (developed a flat spot cos they are left engaged overnight or for some time)
The 2nd reason is the laydown roller.
The pc’s dont actually use the head to lay down the resin , they use the little roller next to the head and these become graunched and hardened over time leading to inconsistent laydown. The head heats the resin and the roller pushes it onto the substrate
So often if the temp used on a resin is marginal and the roller is messed , it doesnt lay down 100%.
Replace that roller , it a little fiddle and the bigest problem is losing the circlip in the machine , its real cheap to do. Get a spare roller as well.
You could also look at the temp setttings and whack it up a little.
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