This is to feed the filament production line, correct? Or is there a possibility of pellet feeding the printers?
Either way pneumatic conveying is the way to go as long as you go with a solution that has a reasonable noise level.
filament production lines. air is the only way to go really.
the print heads with a screw in them print very slow. good for stuff with 5mm line width. not good for .6mm nozzles.
filament lines look like:

what i really want outside lol

into:

then to machine hoppers.































