The critical factors in the high pressure extraction of VCO are the moisture content of the feed material
and the processing temperature in the expeller. Optimum recovery of oil is obtained if the granulated
fresh kernel is dried to a moisture content of 3–4%. The temperature in the expeller should not be
allowed to exceed 90°C in order to prevent the oil from turning yellow. A high pressure expeller with a
water-cooled worm shaft is required to ensure that the temperature inside the expeller remains within
acceptable levels.