Cartridges are all set, no air pockets. This is on both printers. We don't have a guillotine at all.
Yesterday we tried changing all the settings and we found one strange error.
We have two paper types. One is slightly thicker than the other. When we use the thicker one we don't get these marks so commonly. They still appear some times but less frequent.
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I've worked out the whit Dots. This is due to the paper not absorbing the ink so it's the printer feed creating the dots. I still cannot explain the marks which look like Rilke marks. So I filmed the printing with the lid open and it was actually coming from the print heat itself as you could see the marks appear. I filmed this in slo mo so you can actually see it at it happens but I'm unable to upload
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I'd wondered that maybe the paper isn't completely flat, and the print head is touching the raised parts as it passes - it certainly looks like the marks we sometimes get from our wide format printer - mostly when banner printing, as the banner substrate seems to be particularly prone to (occasionally) distorting slightly as it passes through the printer, which causes small "mountains".
It your paper stored flat, and away from heat and moisture?
Hi, that's actually a very good point. It seems that the more ink images need the more we get these marks. It's stored dry and flat in its box but this could be te cause
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Problem solved. Thanks for all your help. It was faulty paper! The only thing not checked!!. It was a batch thinner than usual so as soon as it got a little wet from the in it buckled, which then caused the print head to strike.
Top marks to the supplier, noticed the problem, informed me and replaced them all.
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Justin (17-06-2017)
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