I need a black backing layer to avoid transparency when printing overlays

Question

I´m printing machine overlays on a Mimaki UCJV300 UV-printer. The material is transparent PC plastic.

I have an issue with tranparency when I´m printing lighter colors (yellow, white, sky blue etc). How can I setup a black blocking layer in Illustrator that is alwys printed behind everything else with full coverage? I have tried to make a black rectangle at the bottom of the layer tree, but it only gets printes outside all the other objects. It doesn´t get printed behind them to act like a blocking layer.

Monika Gause · Answer

There should be documentation for that printer how to set up that overprint.

There are several techniques you could use to get that, overprinting, multiplying, spot colors or even layer names could be involved. The layer order could matter, but maybe not, because you could possible specify layer ordering in the printer driver (it is easier to make one black rectangle overprint than it is to make the whole artwork do the same).

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