Re: Re: Plotters for application of Etch resist

I have had good results with a product called Toner Transfer System. It is a
coated sheet of paper that you print the circuit on, then you use an iron
set on high to fuse the toner to the copper. After that is done, you put the
circuit board with the paper in water and the coating slips off the paper
like a decal and the toner image is fused to the copper. Last step is to
etch the board.
Darrell

----- Original Message -----
From: Ian Wright <Ian@...>
To: <CAD_CAM_EDM_DRO@onelist.com>
Sent: Tuesday, October 12, 1999 3:12 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Plotters for application of Etch resist


> From: "Ian Wright" <Ian@...>
>
> For occasional boards which are not too critical I have had some success
> with using laser prints directly. Do a dense black print in reverse of the
> layout and then iron this into the board using a hot domestic iron. If the
> print is dense enough, the board is clean and the print is fresh, you can
> get quite a good transfer which will resist the etchant. Its not a prefect
> method and, sometimes, large areas need a bit of touching up with a resist
> pen, but its usually good enough for prototype boards.
> --
> Ian W. Wright
> Sheffield UK
>
>
> ----- Original Message -----
> > From: Jon Elson <jmelson@...>
> >
> >
> > Yeesh, what a way to drive yourself nuts! It just isn't worth the
hassle!
> > I use photographic techniques to do this. The direct ink on copper is
> > VERY tough to get right, and the ink is always drying up in the pen.
> > For small 2-sided boards, and for larger 1-side ones, you can use a
> > laser printer output, and either contact print the paper output onto
high-
> > contrast film, or make the laser print directly onto transparency film,
> and
> > then contact print that onto th dry-film resist made by DuPont, under
the
> > Riston label. You can get the boards pre-sensitized with this stuff, or
> > you can laminate the resist yourself. The limitation with laser
printers
> is
> > that the registration of 2-sided artwork will not be good enough for
> > most components with boards much larger that 3" square.
> >
> > I made my own laser raster photoplotter for this purpose, but I wouldn't
> > suggest anyone else do this unless you are planning to make a lot of
> boards.
> >
> > Jon
> >
>
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