Expeller pressing
mechanical method for extracting liquids (often oils) by squeezing raw materials under pressure
Expeller pressing (also called oil pressing) is a mechanical 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. As the raw material is pressed, friction causes it to heat. In the case of harder nuts, which require higher pressure, the material temperature can exceed 120 °F (49 °C). "Expeller" is a trademarked term of Anderson International Corporation since 1900, although it has become genericized, is often confused with screw press equipment in general, and does not indicate whether oil extraction is done hot or cold.
Description
An expeller press is a screw-type machine that mainly presses oil seeds through a caged barrel-like cavity. Some other materials processed 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. The machine uses friction and continuous pressure from the screw drive to move and compress the seed material.
“Expeller pressing” enters the record as mechanical method for extracting liquids (often oils) by squeezing raw materials under pressure. Crown Archives preserves that source wording while asking what Expeller, pressing and mechanical can confirm, complicate or overturn.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Dec 14, 2025. The linked authority identifier is Q2963433. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1900.
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This entry incorporates text from “Expeller pressing” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.