Expeller is the key equipment of screw-press process, which is also known as screw oil press. Continuous screw pressing can deal with almost all kinds of oilseeds and nuts (soybean, cotton seed, copra, rice bran, palm kernel). Below is the clarification of mechanical oil extracting machine:
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| Screw oil press machine | Hydraulic oil press |
Single Pressing: Also called full pressing. The oil could be extracted as much as possible. The oil residual in cake is around 5-7%
Prepressing: 70% of the oil will be extracted, the oil residual in cake is around 15-18%
Hot Pressing: Cook the oil seeds before pressing in order to be extracted more oil
Cold Pressing: Keep the temperature between 60 and 70℃ in order to prevent the protein denaturation.
Advantages of Screw Oil Pressing:The mainly advantages of screw pressing type oil extraction plant by means of oil expeller is better adaptability, flexible production, high quality of the oil, light color, pure flavor, simple technology, few supporting equipment.
