• What is an expeller press?
  • An expeller press is a screw-type machine that mainly presses oil seeds through a caged barrel-like cavity. Some other materials used with an expeller press include meat by-products, synthetic rubber and animal feeds. Raw materials enter one side of the press and waste products exit the other side.
  • How do screw presses increase oil recovery rates?
  • In order to achieve the extra oil recovery rates, the seed material has to be exposed to higher pressures over longer retention times in the screw presses. The higher pressures are primarily achieved by lower seed moisture leading to considerably higher friction in the presses.
  • How does expeller pressing work?
  • The oil seeps through small openings that do not allow seed fiber solids to pass. Afterward, the seeds are formed into a hardened press cake, which is removed from the machine. Pressure involved in expeller pressing creates heat in the range of 140¨C210 ¡ãF (60¨C99 ¡ãC).
  • Who invented the oil expeller?
  • The name of the expeller and the expelling process go back to an invention of Anderson International Corp. It has been patented by Mr. Anderson and protected by the corresponding trademark. Through early licensee agreements the expeller soon became the standard machine in the modern oil milling industry worldwide.
  • How hot does an expeller press get?
  • As the raw material is pressed, friction causes it to heat. In the case of harder nuts (which require higher pressures) the material can exceed temperatures of 120 ¡ãF (49 ¡ãC). An expeller press is a screw-type machine that mainly presses oil seeds through a caged barrel-like cavity.
  • When did expeller presses start?
  • The earliest expeller presses utilized a continuous screw design. The compression screws were much like the screws of a screw conveyor ¡ªthat is, the helicoid flighting started at one end and ended at the other. Valerius Anderson invented the interrupted screw design and patented it in the year 1900.