Extrudate exits the barrel at a relatively high temperature typically ranging between 212 to 284°F (100 to 140°C). This molten material needs to be rapidly cooled to avoid pre-reaction, or “B-staging.” The cooling process involves introducing the moving extrudate into a set of chilled rolls, which then convey a ribbon of material onto another cooling surface such as a continuous belt or rotating drum. After the extrudate is sufficiently cooled it is broken into flakes that are suitable for feeding into a comminution or milling process.