An oil extraction machine, also called an oil press or expeller, uses high pressure and heat to “squeeze” the oils out of a plant product. Those products — including seeds, nuts, vegetables, fruits and leafy plants — release their oils through this mechanical process, which is often done without adding any chemicals.

An expeller press is a machine that squeezes oil through a cavity, using continuous pressure and friction. Expeller pressing extracts about 87 to 95% of the oil out of the seed, so some oil is left over after the pressing process is completed. Expeller-pressed oil is commonly refined using this same process.16Expeller 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.While it isn't as efficient as standard extraction (hence its higher price), the oil undergoes fewer chemical changes. The result, some manufacturers claim, is more natural flavor and less damage to the oil's nutrients.

An expeller press is a machine that squeezes oil through a cavity, using continuous pressure and friction. Expeller pressing extracts about 87 to 95% of the oil out of the seed, so some oil is left over after the pressing process is completed. Expeller-pressed oil is commonly refined using this same process.16Expeller 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.While it isn't as efficient as standard extraction (hence its higher price), the oil undergoes fewer chemical changes. The result, some manufacturers claim, is more natural flavor and less damage to the oil's nutrients.