• How to extract oleaginous seeds without solvent?
  • The oil extraction by mechanical pressing is the most common method for continuous treatment of oleaginous seeds without solvent. Different types of presses can be used depending on the purpose (expeller, expander, and twin-screw extruder) and on the capacity range (3 kg h ?1 to 150 t day ?1).
  • Does a screw press affect oil yield?
  • In these experiments, the performance of the screw press (oil yield) followed a second order decreasing polynomial function of seed moisture content (Singh et al. 2002). The moisture content of seeds during the pressing process also affects the quality of oil.
  • Does water content affect rapeseed oil yield?
  • For the rapeseed, a decrease in oil yield with higher water content was observed in continuous pressing (Grosleron 2009; Vadke and Sosulski 1988), while in discontinuous process (in the same range of water content), the oil yield increases (Koo 1942; Lanoisell¨¦ 1995).
  • Does hydraulic pressing increase oil yield?
  • The oil yield obtained by hydraulic pressing from the flattened seeds is higher than one obtained from the whole seeds (Khan and Hanna 1984), while for the dehulled seeds, a lower oil yield is obtained by hydraulic pressing (Singh et al. 1984).
  • How does seed production affect oil extraction process?
  • The increase in the quantity of seed being slightly lower than the increase in oil production, it demonstrates an improvement of oil extraction processes. Generally, the oil extraction is based on two main steps: pressing (solid¨Cliquid expression) and solvent extraction.
  • What is industrial pressing of oilseeds?
  • Industrial pressing of oilseeds is realized using continuous screw presses. The presses are fed with crude or pre-treated seeds. Types of pre-treatments (thermal pre-treatment, size reduction, mechanical sieving, etc.) differ for various seed species (Carr 1997). Each type of seed pre-treatment provides its own advantages.