A Granulator Extruder is an excellent fertilizer pellets making equipment. The double-roller press fertilizer pellets making machine adopts the dry granulation. For granulating the powder fertilizer, more and more fertilizer makers choose to use the double-roller pellet machine. Extruders are screw reactors, and extrusion is a series of processes which includes mixing, forming, puffing and drying. Single and twin screw extruders are the two main types of extruders based on screw configuration. Granulator Extruder is very efficient and useful.