Prior to extrusion calibration of both the volumetric feeder and peristaltic pump was carried out to enable the calculation of the ratio of solid to liquid feed required to give the desired throughput at the given moisture content. The process conditions were set as follows: feed rate of 20 kg/h, moisture content adjusted to 13% and screw speed of 250 rpm. The barrel was heated in two zones the first at 80 C (feed entry to mid point) and the second at 120 C mid point to die exit pressure, material temperature and torque were monitored during extrusion runs and recorded.