Silk screen emulsion is UV sensitive, when exposed it becomes very hard,(i.e. To block the printing inks) the unexposed area is simply washed off, ready for etching. I think I will give it a go, and give feedback when i've run a few tests! Many thanks to all who have so far offered suggestions
David
--- In Homebrew_PCBs@yahoogroups.com, "tda7000" <Tda7000@...> wrote:
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> That would all depend on whether the silk screen emulsion stuff was UV sensitive and reacted the same way as normal UV resist, to actually stay on or wash off according to the pattern.
>
> --- In Homebrew_PCBs@yahoogroups.com, "David" <dgh2259@> wrote:
> >
> > Leon / Andrew,
> >
> > Sorry, I dont think i made myself clear, I was suggesting the emulsion used in silk screen printing to be put directly onto the PCB using Craig's spinning method, not through a mesh, oven dry it, then expose using UV and circuit pattern on a transparency or tracing paper as normal, the exposed area would remain and the circuit washed off with water ready for etching, if that makes sense! I was also wondering if the resist would stand up to the etching chemicals? the main reason is, this type of emulsion is a lot cheaper and easier to get than the dedicated PCB stuff!
> >
> > David
>