Homebrew PCBs

i dont see how you would get the rtv silicone spread perfectly even 
without any peaks that would cause it to not transfer the toner 
correctly.  

i started thinking about soaking a regular piece of paper in 
vegetable oil til its almost clear (saturated) and then run it 
through the printer.  the toner will still adhear to the paper but 
the oil should allow it to release much easier than dry paper.  if i 
get time this weekend ill try it and report back.

matt



--- In Homebrew_PCBs@yahoogroups.com, "Stefan Trethan" 
<stefan_trethan@g...> wrote:
>
> I tried it, but can't get good density on OHP.
> Sb. reported good results if i remember correctly, beeing able to 
peel the  
> plastic right off.
> 
> BUT, if you look at the silicone paper discussion a while back it 
is much  
> what you want.
> Basically you spread some RTV silicone, high temperature variety, 
with a  
> squeegee on a piece of ordinary paper, let cure.
> This will allow you to make nice black transfers with no soaking 
etc. (can  
> just be pulled off).
> 
> I had no opportunity to finish my development of this method, i'm 
quite  
> sure it can be used for transferring resist, but so far i have 
some toner  
> density/pinhole problems with it. (the etchant goes "through" it 
in  
> places). When using paper this does not happen (not sure if it is 
the  
> coating or something else). Anyway, the silicone paper transferred 
stuff  
> looks fantastic and i use it for legend and panels and stuff. At 
some  
> point i'll look into it again for resist. The paper can be re-
used, since  
> all the toner comes off but it can also be cleaned with acetone.
> 
> 
> ST
> 
> 
> On Fri, 18 Nov 2005 23:09:42 +0100, 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?
> >
> >
>