3.6.1 Dry extrusion
Dry extruders are single screw machines, normally used for the processing of whole or
ground soybeans, because of the high content of oil in the beans. Heat is generated
through friction to cook and dehydrate the material [RIAZ].
These extruders consist of a delivery system, a preconditioner (optional), an extruder
barrel (with die or nose cone) and a shaping and cutting device (for pellets or for