The cleanness of seeds decides the efficiency of oil recovery so that the shells should be removed prior to the subsequent oil extraction process [56,57]. The presence of shells allows the diffusion of oil from the kernels to the shells during the oil extraction process as the shells can retain the oil in the press cake [58]. Therefore, the separation of shells from the seeds is now normal practice for better oil yield. Further, increased shell content could potentially increase the operational pressure required in the mechanical expeller and hence cause energy wastage [59]. The oil-free husks can also be a barrier to block the oil emerging from the kernels and this affects the oil yield. Therefore, the whole seeds should be processed into a broken form to allow greater exposure of the oil-rich kernels to the pressing tool during extraction [60]. However, this is not a common practice currently. The whole seeds are basically produced and just stored instead of producing the broken form. It is believed that the whole seeds are more valuable to commercialise as compared to the broken form since the broken seeds are typically related to poor quality