Expeller Pressing Expeller pressing is a specific type of mechanical extraction that uses a continuous screw mechanism. The refined oil is then filtered and packaged in airtight containers to prevent oxidation.
From Peanuts to Oil: A Detailed Look at How Peanut Oil Is Made Step By Step
As peanuts move through the press, friction and pressure increase, forcing the oil out. Packaging materials are selected to protect the oil from light and heat, preserving its nutritional integrity and flavor.
This method ensures nearly complete extraction but requires stringent controls to remove residual solvents. The nuts are first heated to soften the cell walls, making oil extraction more efficient.
Step-by-Step Production of Peanut Oil Using Expeller Pressing and Solvent Extraction
While this method is straightforward and chemical-free, it may not extract every last drop of oil. After mechanical pressing, the press cake undergoes further treatment with a food-grade solvent, typically hexane.
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