Bob,
Dry film photo resist is laminated to the panel using a hot roll
laminator. The dry film resist that I use is .0015" thick and is
developed in a 1% sodium carbonate (soda ash) solution. These films
are negative acting and exposed with a UV light source. My light
source uses a mercury vapor lamp which exposes the film in about 17
seconds. If you expose the film using a negative you will have the
traces and pads left behind on the copper panel for etching. After
etching the photoresist is stripped from the board using a weak
sodium hydroxide or lye solution.
Tom
--- In
Homebrew_PCBs@yahoogroups.com, "Bob Fitzgerald <newaag@y...>"
<newaag@y...> wrote:
> What is the technique with dryfilm resist? It sounds like it is
> laminated to the boards with heat? I just bought a dry mount press
so
> I'm interested. I assume this is better than spraying boads? Is
this
> one of those products where it is not sold in small qty?
> thks
> Bob
>
> --- In Homebrew_PCBs@yahoogroups.com, "twb8899 <twb8899@y...>"
> <twb8899@y...> wrote:
> > I can help anyone interested in blank boards with dryfilm
> > photoresist. I have a laminator and plenty of dryfilm resist on
> hand.
> >
> > Also have a photoplotter that makes positive or negative films
from
> > Gerber photoplot data. Contact me off list if there is any
> interest.
> >
> > Tom twb8899@y...
> >