Not to hijack this thread (which has wandered away from the original
post...and onto RTV silicon impregnated papers and direct-to-copper
printing)...but to address the original posters question:
Yes, laser transparency sheets work great for TT. I have used the 3M
brand. I personally was never able to get any of these papers (or
glossy magazine pages) to work for me using TT. Of course, I never
bought a laminator...so I was probably not using an even enough heat
distribution with my naive clothes iron based approach.
But I will testify that viewgraph transparencies worked GREAT. The
transparency just peels off...and leaves ALL the toner behind. The
etched traces looked pretty good.
I stopped using this technique for completely unrelated reasons. It
should work well for others.
I did have to be a little careful about ironing the board TOO long.
Because then the toner would smear a little. I am guessing the toner
doesn't really bind that well to the plastic, versus paper.
Jim
P.S. BTW, I have stopped using TT, myself. I am putting together a
small mill to mill isolation traces. The reason I want to do things
this way...is that I am just a hardware hacker. I build my designs a
susbsystem at a time...and so...I need to be able to continue adding
traces onto an existing populated board. That's a little hard to do
using ANY chemical milling technique. (The parts would be destroyed
by the wet chemistry involved.)
Yes, I want to use PCBs even for one-off experimental projects. It
seems like too cool a way to go - to not try it out
--- In
Homebrew_PCBs@yahoogroups.com, "matt clement"
<buckeyes1997@y...> wrote:
>
> I was wondering if people use the toner transfer method with the
clear
> laser print transparency sheets?? I like the ability to see through
> the film for ligning up dual layer boards with a few key drill holes
> for alignment. Simply line up the holes with the pads on the clear
> sheet and iron on. I have tried it with copier transparency sheets
> and got okay results but never tried the laser printer sheets. My
> guess is they can take much higher heat than the ones for copiers.
I
> wondered if one sheet could be cleaned with Acetone and reused a few
> times??
>
> Anyone have any thoughts or comments?
>