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Subject: Printing dircetly onro PCB copper side Part II
Date: Thu, 12 Sep 2002 14:50:59 +0200
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Ok thanks for all your responses.
It seems that with piezo inktjets it schould be possible to get some kind of
Etch resist ink dircetly onto the copperside of a PCB.
But this would need some special ink (maby just mixing regular ink with some
chemcal would make it Etch resist).
Some experimentation would be needed and in de worse case you will ruin/clog
And Piezo Printheads are expensive to replace as Brad pointed out.
Ironic as it may be Thermal inktjets often have the printhead intergrated
into the ink cartrige (HP). This makes them a lot cheaper to replace then
there piezo coussins but thermal heads need waterbased inks as some folks
pointed out and those inks would disolve in the Etch bath.
But what if you printed the INVERTED image of your design onto the copper
side of the PCB using the regular ink and then coat the whole thing with
some standaard Etch resist ink.
Then when you put it in the Etch bath the parts of the board that received a
"normal ink" and a "Etch Resist ink" might let go and only the parts that
have 1 layer of etch resist would remane .
Or would the second coat of Etch resist prevent the unlying layer of "normal
ink" to dissolve in the Etch bath ?
Maybe this "print and coat" method won't work but maybe some variation on it
or does somebody else have a better idea. Thermal wax ? goodold
pinhead/ribbon printers ?
I also took a look at printerhead manufactures and found out that you can
make a Piezo head printer that can do (somekind of) Etch resist ink. The
price of these heads and the effort needed to develop en new printer or
retrofitting and old one would be factors in considering using these kinds
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