--- In
Homebrew_PCBs@yahoogroups.com, "Nick de Smith" <nick@...>
wrote:
>
> Hi,
>
> I'm using an HP LaserJet 1300 set to "Dark" on 600dpi to print
simple
> PCBs (10mil or greater widths).
>
> When I look at the masked areas under a microscope after etching
with
> sodium persulphate, I see a lot of porosity, i.e. little holes
etched
> in the black areas. I'm ironing quite heavily and the boards look
very
> solid when inspected under the uscope after the backing paper has
been
> soaked off so I don't think that this is an adhesion issue....
>
> Is there anything that can be done to make the ink less porous? I
note
> that http://www.pulsarprofx.com/ have what they call a green "TRF"
that
> is supposed to do this - anyone know what it really is?
>
> Cheers
>
> Nick
>
Re-heat the PCB AFTER transfer to "re-flow" the toner and fill in the
pinholes.
--
James.