On Fri, 2007-04-20 at 13:04 -0500, John Griessen wrote: > Peter Clifton wrote: > > > I thought about this, and decided that it would work. The charge > > patterning is on the toner drum, and the process uses a HV charge > > underneath the paper to attract the toner off it. You could energise the > > FR4, perhaps the bottom of it. > > Hmmm.... the way the metal would have charge on a big capacitance might make > the toner jump around as it moves > from drum to metal surface though....because of the local field changes as > the first particles land affecting > the following ones... On paper, some particles canceling charge still > don't let current flow -- the surface holds static charge.
I'm not sure if toner is conductive, or if the particles would behave like little capacitor plates. > Has anyone done tests about printing onto metal foil covered paper? I > wonder... > the signage and plaque making businesses use dye sublimation for foil > overprinting to get zappy metallic reflective colors... I never got as far as testing that, but well.... might take the risk... off to find some bacofoil. > > Aligning a 2-sided board would be near impossible. > > But printing on two thin substrates might work with the right substrate and a > "heavy paper setting" > on a recent high performance laser printer..... Then align and laminate them > with epoxy like > multi layer board fabbers do... > > > > > > At one stage, I had a laser printer stripped into pieces, we needed to > > re-design and cut new chassis side-plates to hold the guts making the > > "paper" path flat. > > > > Of course, as with all interesting projects - there was never time to > > finish it. It never really got past the investigatory stage. > > Wow! That IS industrious! We never got as far as modifying the original chassis. What I'd intended to do, was scan the old metal sheets, then make a new design in CAD> (Basically, all the printing mechanisms were aligned on a few accurately positioned stampings in the side-panels, so it should have been possible to make a new chassis using the department's water-jet cutting machine). > The news about reduced silver nitrate printing is exciting. Just think of > making a multi layer > stack out of that... What if you chose a plastic substrate that ablates > well and makes a reducing atmosphere > as it does? Then you would have a chance that laser drilled holes could > still have an annular > ring of internal stack layer silver exposed to bondmore silver to! Voila, > the only subtractive part of > the stack up of connectivity is the laser drilling. Poof go environmental > concerns, up goes locally > feasible productivity! Its all quite exiting stuff. I doubt anything will replace solid copper bars, nuts, bolts and plates in big power electronics though! Peter _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user