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Expeller pressing is a chemical-free method for extracting oil from raw materials. The raw materials are squeezed under high pressure in a single step. When used for the extraction of food oils, typical raw materials are nuts, seeds and algae, which are supplied to the press in a continuous feed. Expeller presses can recover up to 75% of the oil from algae. As the raw material is pressed, friction causes it to heat up; in the case of harder nuts (which require higher pressures), the material can reach or exceed temperatures of 120 °F.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Expeller_pressing". A list of authors is available in Wikipedia.|