The main factors affecting the oil press oil press to take effect squeezing the decision to take the oil effect on many factors : including virgin material structure and crushing conditions in two areas . In addition, oil extraction equipment structure and oil extraction will also affect to some extent the effect of the oil . Virgin virgin feed material influence to the structure and the structure of virgin material and the mechanical structure of both the inner and outer structures . Structural properties of virgin material depends mainly on the pre-treatment ( mainly steamed fried ) The quality of the ingredients and the oil itself . Virgin material structure for general requirements . Virgin material required under the consistent particle size should be appropriate and consistency press virgin material inside and outside the structure of a good number of extra virgin compound intact cells as small as possible , machine for pellets density inside and outside the structure without affecting the premise bigger the better . Requirements virgin oil viscosity and surface tension of the compound try to be low , virgin material particles have sufficient plasticity.