In fig. 2 the process of decentralised cold pressing from the oil seed until to the press
cake or the clean plant oil is shown.
To get a good oil quality, the pre-treatment of the seed is important. A low phosphor
content, the temperature and the humidity of the seeds are important. The phosphor
is a component of the seed that goes into the press cake during cold pressing and not
into the oil. This undesirable content is minimised with reduced seed humidity, the
yield of oil rises and the content of solids in the oil increases then. Higher humidity of
the seed will increase the throughput and decrease the oil yield.
With humidity of the seeds between 6.5 and 7.5%, the capacity, the yield of oil and the
content of phosphor and solids in raw oil is optimized [FERCHAU, 2000].