Hello,
It exist somme type off solder mask ink and some type off ink to print directly on the copper before ectching.
For this special ink you can go to "Lackewerke Peters"
http://www.peters.de/index_e.htmTo print directly on copper, the "ELPEMER SD2050uv" work very well.
Just applied with 99 mesh stencil, cure with UV, ectching, strip with alcalin média, and is finish.
This ink is use for big and low cost production.
http://www.peters.de/produkte_e/s2_0200000e_016.pdfOr RC2054HR for UV exposable, use in yellom light room.
For solder mask, SD2467 SM-YG work very fine, very simple, applied with a 43 mesh stencil in yellow light room, just clean directly all tools after applied.
For 2 components, you can obtain the pack to prepare 1 kilo use ink, but, you can prepare the necessary quantities with an scales electronique in grammes, the proportion are 1 for 4, no problem, mix 10 minutes, wait still 10 minutes for air debuller and apply with screening.
Still 10 minutes, cure in ventillation oven: for simple face: 45 minutes max 80° centigrade.
For double face: the first face 15 minutes at 80°, let get cold, print the second face, cure 30 minutes et 80°, let get cold, make insolation in you UV normal process, exposure time is 3 or 4x long off normal exposure time (or test with STOUFFER game) , developement in alcalin media, (température is critique), rinc with water, cure at 140° centigrade 70 minutes, and is finish.
All in yellow ligth room, absolutly.
Best injoy in production.
Patrick Bayard
T.S.E. scrl Belgium (Europe)
Also
http://www.a2p.be --- In Homebrew_PCBs@yahoogroups.com, Simao Cardoso <simaocardoso@...> wrote:
>
> On Wed, 2009-06-24 at 16:37 +0000, Steve wrote:
> >
> > I'm sure it is UV cured polymer/acrylic. It has been in use in the
> > electronics industry for a long time, and has been used in the gift
> > industry to make stickers.
>
> Every LPI soldermask i know about uses resin and hardener.
> There really is a type of epoxy 1 part only cured in UV or very hot
> temperatures. The prices are about 45+ usd for 30ml, to 100+ usd for 1
> gallon (or 15usd for 2oz as a surfboard glue). So the epoxy green
> soldermask which originated the thread really seems a great deal.
>
>
>
> > Don't confuse UV -cured- polymer with UV -resistant- outdoor ink.
> > Nothing similar.
>
> I know the diference, but yes i ended mixing them in the line. Most
> outdoors are printed in paper, and not with the ink i was writing about.
>
>
> > I think "sensitizer" is the word you are looking for?
>
> Yes! And sorry for my bad writing again. I should write less or use the
> dictionary more often.
>