At 06:16 AM 11/16/2010  -0800, Rocket J Squirrel wrote:
>Clever. What's the stack? Something like a sandwich of film, foil +
>adhesive, film? The plastic film is -- what? Mylar (polyester)? That
>stuff can take some heat.

Should be thick polyester+foil which is coated with resist and etched
to leave the circuit; then thin adhesive-backed polyester
(hot?)-pressed on top.

On various printers, keyboards and such I've had open instead of
etched foil they silk-screen silver paint on the
substrate.  Occasionally they don't even cover it.

d