Reviving an old thread...
Originally Posted by Loris Medici
I think the opposite is true about acrylic transmission of UV. See here.. http://www.fresneltech.com/materials.html
Making an acrylic (plexiglass) or polycarbonate contact printer would be great for alt processes. Since it's lighter though, I wonder what thickness one would need to provide substantial weight for holding things flat, and if that increase in thickness would negate the boost in UV transmittance (I suspect it wouldn't). Or alternatively, if you designed a printer with even pressure around the edges you could probably get around any issues from the weight difference, but rigidity would become just as much of a problem.
update: something like this -> http://www.spartech.com/polycast/solacryl.html
Last edited by holmburgers; 12-19-2011 at 01:31 PM. Click to view previous post history.