The one time I tried drying a FB print face down on a screen (Okay, it was a towel! I was experimenting!) it curled like a Scottish Olympic hopeful. I now dry them clipped back to back on a line which minimises the curl but now they warp like the Starship Enterprise (all right, enough of the crap similes!).
Basically, I still haven't found a method that works for me, I have no press and a couple of sheets of museum board and all my reference books took weeks to flatten them. I know Aggie recommends ironing them, which I've yet to try (despite being male I'll give it a go!).
All suggestions on this thread very welcome...!