Homebrew PCBs

The additive must have a delicate balance of functions. Primarily, 
it must not plug up the nozzles when sitting. It must also be easily 
cleaned.

There has been some unsuccessful work done with "Future" polymer 
floor wax. There also was some mention of using glycerine to slow 
down the drying process.

Another issue is the type of printhead. The Epsons use a small piezo 
pump, whereas the others actually vaporize a small amount to drive a 
droplet out of the head.

Not an easy problem.

TANSTAAFL!

Myc



--- In Homebrew_PCBs@yahoogroups.com, "Herbert E. Plett" 
<cachureos@...> wrote:
>
> When I first made this post, I was it who made the mistake of 
mixing
> (miscreating) threads. I apologize.
> As there was no reaction I am re-posting, or am I barking up the 
wrong tree?
> ------
>   
> I have not done any tests by myself yet, but what I have been 
reading makes me
> think of certain points:
> 
> -there are apparently two sorts of ink: dye and pigment based.
> -dye inks are essentially thin and leave (almost) no residue and 
work by
> 'dirtying' the surface they are applied to.
> -pigment inks are thicker and leave some sort of 'residue' (aka 
pigment) on the
> surface they are deposited on.
> -the 'curing' process applies heat until the 'residue' burns 
(carbonizes)
> leaving something stuck on the surface that is not water (etchant) 
soluble.
> -dark inks need very little residue to be visible, whereas light 
inks (yellow)
> need a thicker residue to be visible, so after 'curing' more stuff 
is available
> to protect the surface. This explains why black has proven useless 
and yellow
> the best.
> -alternate reason may be that black is already carbon and does not 
change by
> heating while yellow is some sort of delicate organic pigment that 
nicely
> 'burns' and sticks during curing. Remember that those who report 
success say
> the yellow has to turn brown to work.
> 
> question to discuss:
> is there some chemical (surely organic) to be added to the ink 
that:
> 1) is water soluble (or suspendable)
> 2) adheres well to metal
> 3) becomes inert when (over) heated?
> 
> the yellow pigment of MIS ink is one answer, are there any others?
> some sort of water soluble varnish?
> one that could be used with non Epson printers?
> 
> 
> 
> 
> 
> 
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