Mechanical Oil Extraction Techniques from Oilseeds
Summary
Mechanical oil extraction from oilseeds encompasses a variety of pressing and compression methods that separate oil from solid biomaterials through externally applied force. Conventional approaches include cold pressing, hydraulic pressing and screw pressing, each offering distinct advantages in terms of oil yield, quality and energy consumption. Cold pressing relies on relatively low pressures and ambient temperatures to preserve thermolabile compounds and minimise oxidation but may leave higher residual oil in the seedcake. Hydraulic pressing employs high pressures in a static chamber to increase oil recovery, though it typically requires greater investment and maintenance. Screw pressing, or expeller pressing, uses a rotating auger to convey, grind and compress seeds through a tapered barrel, achieving continuous operation and higher throughput. Pre-treatments such as heating, freezing and moisture adjustment can soften cell walls, alter viscoelastic properties and improve oil expression efficiency. Parameters including compression force, pressing speed, temperature and grind size are systematically optimised to balance oil yield, quality indicators (such as peroxide value and free fatty acid content) and energy requirements. Advances in mechanical design, materials and process control have broadened the global adoption of mechanically pressed oils, particularly for niche applications in culinary, cosmetic and pharmaceutical sectors, where unrefined and cold-pressed oils command premium value.
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Mechanical Oil Extraction Techniques from Oilseeds publication trend
The graph below shows the total number of articles in mechanical oil extraction techniques from oilseeds across all publications each year (not limited to Nature Index journals).
Technical terms
Uniaxial compression: A loading condition where force is applied in one direction to deform seeds and express oil.
Screw press: A continuous expeller with a rotating auger that conveys and compresses oilseeds through a tapered barrel.
Cold pressing: An extraction method conducted at ambient or mildly elevated temperatures to preserve sensory and nutritional qualities.
Seedcake: The solid residue remaining after oil extraction, often used as animal feed or further processed for residual oil recovery.
Oil expression efficiency: The ratio of oil obtained to the total extractable oil content, expressed as a percentage.
References
- Assessment of Quality and Efficiency of Cold-Pressed Oil from Selected Oilseeds. Foods (2023).
- Using Box–Behnken Design Coupled with Response Surface Methodology for Optimizing Rapeseed Oil Expression Parameters under Heating and Freezing Conditions. Processes (2022).
- Influence of Grinding Degree and Screw Rotation Speed on Sunflower Oil Pressing Process. Applied Sciences (2023).
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