Homebrew PCBs

I want to find UV curable conductive ink.
I once found a company that had a conductive ink that "set"
at 150 Centigrade.  Then it could be used above that temperature
after it was cooled.

AGSC

On 2006-Jul 25, at 06:12hrs AM, lcdpublishing wrote:

I would suspect that you would be better off finding/using a UV
cured Ink. My large HP Printer (24" wide) uses UV cured ink but
being a big and expensive printer, I have not yet had the courage to
try and run a PCB through it.

With that system, if I understand it correctly, the print head puts
the ink on the paper, and next to the print head is a UV light
source that cures it instantly.

Some day I would like get the guts up to run a PCB through it, but
that won't happen anytime soon I am afraid.

Just some thoughts.

Chris

--- In Homebrew_PCBs@yahoogroups.com, David Cureton <yahoo@...>
wrote:
 >
 > Hi Myc Holmes,
 > Based on your research chemist background, maybe we can
utilize your
 > experience in that regard.
 > I have been racking my brain tryng to think of chemicals that may
be
 > suitable as an ink replacement for printing PCB etch resist.
 >
 > I am thinking that a two part ink similar to an epoxy would be
the
 > best. My C88 printer has 120 black jets and 179 jets for the
colours.
 >
 > Therefore if we can work out a two part ink then the black jets
could
 > lay down PART A with the remaining colour jets laying down the
PART B to
 > set
 > it.
 >
 > Naturally these substances would need to have a similar
 > physical/chemical properties as the inks which the printer is
supposed
 > to use and most likely need to have a fairly neutral pH.
 >
 > Any ideas?
 >
 > Cheers,
 > David
 >
 >
 > Myc Holmes wrote:
 >
 > >Hi Voltan,
 > >
 > >First of all, I congratulate you on a great idea and the work
cleverness
 > >that have made it work for you.. I agree, a 99% reliability rate
is not
 > >needed, just somewhat equal to Toner Transfer.
 > >
 > >As part of my research chemist background, I find it is important
to
 > >identify and document all the details for repeatable results.
The key is in
 > >the details.
 > >
 > >I've been following your work and am trying to repeat it. It is
frustrating
 > >when it fails and appears that the process has been duplicated.
Until just
 > >recently, the use of Brake Fluid to reduce surface tension and
now the fact
 > >3 sets of nozzles / cartridges are being used to correct coverage
problems
 > >has been published. It is very normal that some details the you
just take
 > >for granted are especially important and need to be mentioned.
 > >
 > >These are the missed details that slow down the progress by
others. After
 > >all, it has been 4 months since your original post and no one yet
has
 > >successfully duplicated your results.
 > >
 > >It could be similar to Toner Transfer, where apparently minor
variations
 > >have a major impact.
 > >
 > >Again, I apologize if it appears that I am disparaging you
efforts, but I am
 > >trying to get a grasp on all the details to be able to repeat
them.
 > >
 > >Myc
 > >
 > >On 7/24/06, Volkan Sahin <vsahin@...> wrote:
 > >
 > >
 > >> I didn't understand you reliability question, if possible
please
 > >>explain a little bit more, what are your reliability criteria?
Do you mean
 > >>successful repeatability or reliable as TT :)? Please don't ask
me to have
 > >>99% success rate.
 > >>
 > >>I could be able print on pcb without any failure, it may be
because of the
 > >>printer that I am using. The main thing is, board needs to be
clean, free of
 > >>finger print, dust, and grease like required in TT process and
you need to
 > >>use as many colors as possible to decrease the effects of
clogged nozzle. I
 > >>am always using 3 colors. I didn't do 100 pcbs with this
technique but I can
 > >>say that, at least for me, success rate is much higher than TT.
If someone
 > >>plans to do double layer PCB with CNC drill or applying solder
resist then
 > >>there is no chance to do it with TT, either he needs to use
photo-resist
 > >>/dry-film or direct inkjet.
 > >>The curing process is the key for direct printing, you need to
cure it
 > >>until seeing some smoke on pcb, ink color becomes much darker
and copper
 > >>will be oxidized. I think after a few trials you will understand
what I
 > >>mean.
 > >>Good luck,
 > >>Volkan
 > >>
 > >>....successfully and reliably repeated. We have only heard from
Voltan
 > >>that it is do-able, but nothing about the
 > >>
 > >>reliability. From Stefan's posts, his trials show a
repeatability problem.
 > >>
 > >>
 > >>
 > >>
 > >>
 > >>
 > >>
 > >
 > >
 > >[Non-text portions of this message have been removed]
 > >
 > >
 > >
 > >Be sure to visit the group home and check for new Links, Files,
and Photos:
 > >http://groups.yahoo.com/group/Homebrew_PCBs
 > >
 > >If Files or Photos are running short of space, post them here:
 > >http://groups.yahoo.com/group/Homebrew_PCBs_Archives/
 > >Yahoo! Groups Links
 > >
 > >
 > >
 > >
 > >
 > >
 > >
 > >
 > >
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 > >> >X-eGroups-Msg-Info: 1:0:0:0
 > > From: "Myc Holmes" <mycroft2152y@...>
 > >X-Yahoo-Profile: mycroft2152
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 > >Date: Mon, 24 Jul 2006 13:44:19 -0400
 > >Subject: Re: [Homebrew_PCBs] Re: Epson R220 PCB printing Report #1
 > >Reply-To: Homebrew_PCBs@yahoogroups.com
 > >Content-Type: text/plain; charset=US-ASCII
 > >Content-Transfer-Encoding: 7bit
 > >
 > >Hi Voltan,
 > >
 > >First of all, I congratulate you on a great idea and the work
cleverness
 > >that have made it work for you.. I agree, a 99% reliability rate
is not
 > >needed, just somewhat equal to Toner Transfer.
 > >
 > >As part of my research chemist background, I find it is important
to
 > >identify and document all the details for repeatable results.
The key is in
 > >the details.
 > >
 > >I've been following your work and am trying to repeat it. It is
frustrating
 > >when it fails and appears that the process has been duplicated.
Until just
 > >recently, the use of Brake Fluid to reduce surface tension and
now the fact
 > >3 sets of nozzles / cartridges are being used to correct coverage
problems
 > >has been published. It is very normal that some details the you
just take
 > >for granted are especially important and need to be mentioned.
 > >
 > >These are the missed details that slow down the progress by
others. After
 > >all, it has been 4 months since your original post and no one yet
has
 > >successfully duplicated your results.
 > >
 > >It could be similar to Toner Transfer, where apparently minor
variations
 > >have a major impact.
 > >
 > >Again, I apologize if it appears that I am disparaging you
efforts, but I am
 > >trying to get a grasp on all the detai
 > >
 > >
 > > -0-0-0-
 > >
 > >
 >




Gus S Calabrese
Denver, CO
720 222 1309     303 908 7716 cell
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