Homebrew PCBs

Thanks for the update MYC, it is good to read about some positive 
results!  The crude tests with durabrite inks did show they would 
resist, but not very well.  However, my tests were very crude and I 
didn't cure them in the oven - only hit them with a heat gun for a 
few seconds or so (till I saw smoke).

chris



--- In Homebrew_PCBs@yahoogroups.com, "mycroft2152" 
<mycroft2152@...> wrote:
>
> i've been in contact with Volkan off list and had received samples 
of 
> the MIS ink on pcbs. The samples were for testing the individual 
inks 
> in etching baths.
> 
> Volkan painted the inks on the prepared copper then 'cured' at a 
high 
> temperature over a stove burner. Two layers of ink were coated on 
the 
> samples.
> 
> I tried 2 different etching baths, FeCL and HCl/H2O2. 
> 
> The 4 inks (black, cyan, yellow, magenta) withstood the FeCl very 
well.
> 
> The HCl/H2O2 attacked the black and Cyan inks rendering them 
useless, 
> The Yellow and Magenta held up very well.
> 
> Some observations:
> 
> Curing is critical. Need to determind the exact conditions.
> 
> The 'painted' double layer is not representative of the printed 
> pattern. The thicker edges seem to be attacked more easily in the 
> etchants.
> 
> Some thoughts:
> 
> The inks are alcohol soluble. A little rubbing alcohol (isopropyl) 
> removed the inks. Note for cleaning up afterward.
> 
> Is it just the MIS ink clone formualtion of the Durabrite ink that 
> works? Were the MIS inks used because that was availible to Volkan 
at 
> the time? Would the Durabrite ink work?
> 
> Last night, I was able to print a few prepared flexible pcb's 
using 
> and Epson C66 printer with Durabrite ink. The print quality was 
very 
> good and the coverage ok with only slight beading on th solid 
blocks. 
> I used variosu settings for print qualtiy from the Epson control 
panel.
> 
> after 12 hours the Durabrite ink was still wet and smudged easily. 
The 
> next step in to put them in an oven, at variopus 
time/temperatures, to 
> cure. then etch.
> 
> Will keep you posted.
> 
> Myc
>