a thousandfold proven Untha 4-shaft technology After the material to be shredded has been drawn into the main cutters 1 , it is both pre-shredded and re-shredded in a single pass. Material that does not fall through the screen 2 is transferred to the secondary cutters 3 and moved back up and fed back into the cutting chamber for re-shredding. The screen determines the size of the final fraction. H T O E P F 3 2 4 1 3