• 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.
  • What happens during screw expeller processing of palm kernel seeds?
  • Heat transfer between the pressing chamber and the oil and oilcake streams during screw expeller processing of palm kernel seeds. Journal of Food Engineering, 31 (1), 1¨C7. Omobuwajo, T. O., Ige, M. T., & Ajayi, A. O. (1998). Theoretical prediction of extrusion pressure and oil flow rate during screw expeller processing of palm kernel seeds.
  • What is a screw press expeller?
  • The expellers (named after the first screw press founded by Anderson in 1902) are the screw presses most often encountered in the industry. They consist of a screw rotating in a horizontal perforated barrel formed by regularly spaced metal bars (this space can vary from 0.5 to 0.1 mm); the oil flows along the barrel.
  • 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 moisture affect oil yield?
  • This impact is taken into account by the press manufacturers indicating acceptable seed moisture content range for their equipment. According to the species of oilseeds, increasing the moisture content has different effects on the oil yield (Fig. 7a). Generally, an increase in moisture content leads to a decrease of the oil yield.
  • How does dehulling affect oilseed expression?
  • The operating parameters are dependent on the seeds considered. Shelling, also known as dehulling, according to seed type is used to separate the seed almond rich in oil (usually cotyledons) of woody shell (hull and shell) that surrounds it. Few studies at a laboratory scale have investigated the effect of dehulling on oilseed expression.