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Expeller Press - Definition, Glossary, Details - Oilgae
Expeller 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. Expeller presses can recover 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 exceed temperatures of 120 ° - Expeller pressing - From Wikipedia
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Expeller pressed oils are arguably the best for human consumption. Canola oil is a rich source of vitamin E, an important dietary antioxidant. Canola oil also contains the lowest amount of total saturated fat of commonly consumed vegetable oils and is second only to olive oil in the levels of the important monounsaturated fat, oleic acid - Source