I recently acquired a line straightening tool that is in the DuBro fishing tackle catalog. Its a series of rollers on three axles see:
http://shop.proseriesfishing.com/p/small-wire-straightener?pp=12.
It does work but it changes the surface finish of the lines. Better to not kink the lines in the first place.
I'm new at this but i've got a couple routines that help prevent the kinks.
1. As I unroll my lines I stick my finger between them and when I encounter a twist, i just turn the reel until its gone.
2. Before i hook up to the plane or handle, I pass the last few feet through my fingers and let the individual wires unwind. Occasionally, I hook the lines to another handle fitted with ball bearing fishing swivels. Give it a tug and watch the twists go away. Lines lay flat and straight.
Curious as to how others deal with this.
Norm