I will do some more experimenting on next batches.
I generally do 3 to 6 PCBs per batch...usually two at a time..... so I did the TRF experiment last.
There may have been one other chemistry change not accounted for in this batch.
I always scrub\ufffd all copper with real fine...600? grit sandpaper then rub clean with
ACETONE.
This particular batch I used drug store\ufffd NAIL POLISH ROMOVER PRETTY NAILS acetone.
\ufffd which has 20 ingrediants and is purple.
So I have to wonder if any of this crap was left on the copper after it was dry.
AND
then when it was time to wash off the final toner from the etched traces....
this nail polish would NOT disolve the toner so I resorted to 100% acetone .
So I learned that NAIL POLISH remover with the first ingrediant as acetone was
rather useless for this task.
\ufffd
\ufffdOn 26 Dec 2016 09:22:52 -0800, you wrote:
>Harvey,
>
>That's crazy, as it's exactly what I was talking about. I think about two sessions ago I had the TRF come out looking almost exactly like it does going in. It just lifted right off the board with almost no part sticking. I think I ended up moving to my old iron and not using the laminator. I'm still of the belief that something in there has to be different. Maybe the laminator lies about its current temp or something??
Actually, I don't think so, since I was doing a run and the ones
before and after turned out ok.
I'm beginning to suspect the foil itself may have a contaminant on it,
or the toner, somehow.
Putting fresh foil on the board and reworking the board generally will
ruin something on the pattern.
Harvey
>
>Take Care