Can a Peanut Oil Extraction Machine Process Other Types of Nuts or Seeds?

Peanut extraction machines was originally designed primarily for peanuts, and with technological advancements and process optimizations, peanut press has surpassed its original purpose and demonstrated broad adaptability to a variety of nuts and seeds. This paper systematically discusses the cross-category processing capabilities of peanut oil extraction machines from four aspects: equipment principle, technical parameters, practical application case and operation guide.
1.Equipment Principle: The Universal Foundation of Physical Extraction
Peanut extraction machines employ two main technical methods --screw presses and hydraulic static presses --both of which rely on mechanical forces to break down the structure of an oil-containing battery, allowing oil to seep out without pressure of a chemical solvent. This physical extraction method essentially supports cross-class processing.
Screw Pressing Technology
The rotating screw shaft produces progressive pressure that causes the oil seeds to be pressed, rubbed and sheared in the pressure chamber. Cell wall ruptures, releasing oil through gaps between pressure rods. This method is suitable for oilseeds with moderate oil content (15%-40%) and small particle sizes, such as peanuts, soybeans, oilseeds, etc.
Hydraulic Static Pressing Technology
The hydraulic system applies uniform static pressure to slowly compress oilseeds in a sealed chamber. Oil is filtered through a sieve under pressure. This method is ideal for high oil content (40%-65%) and fragile oilseeds (such as sesame, walnut and almond) to maximise nutrient retention.
Although there are differences in pressure applications, both methods extract oil by damaging cellular structures, forming a basis for cross-species adaptation.
2.Technical Parameters: Quantitative Support for Cross-Class Treatment
Modern peanut oil extraction machines can be adapted to diverse oilseeds with modular design and adjustable parameters. Key indicators affecting processing capabilities include:
Pressure Range
Screw models typically range from 40-60 MPa, while hydraulic models reach over 200 MPa. High pressure is effective at extracting oil from hard-shell seeds (such as walnuts and almonds), while low pressure prevents soft seeds (such as sunflower and flaxseed) from being crushed too much.
Chamber Clearance
Adjustable clearance (25-50 μm) can be adapted to different seed sizes. For example, sesame seeds require ≤30 μm clearance for optimal yield, while soybeans need ≥45 microns to prevent blockage.
Temperature control
Infrared systems maintain precise temperatures (60-200°C). Heat pressure (120-180°C) is suitable for highly oily seeds (e.g., peanuts, walnuts) that require cell wall disruption, while cold pressure (<60°C) preserves bioactive compounds in seeds such as flax and basil.
Rotational Speed Adjustment
Screw shaft speed (20-60 RPM) affects extraction efficiency and oil quality. Low speed (20-30 RPM) extends pressing time of hard seeds, while high speed (40-60 RPM) is suitable for rapid extraction of soft seeds.
3. Practical application cases: Empirical Validation of cross-category treatment
Numerous studies and industrial applications have confirmed the technical feasibility of peanut oil extraction machines for diverse oilseeds:
Walnut Oil Extraction
By adjusting the gap to 35 35 μm temperature to 150°C, and speed to 30 30 RPM the screw press model achieved a 42% oil yield (65% walnut oil). Edible oil met national edible standards with acid value <0.5 mg KOH/g.
Cold-Pressed Flaxseed Oil
Hydraulic static pressure at <60°C extracted 38% of the oil (40% of flaxseed oil) and retained >90% of alpha-linolenic acid --significantly higher than traditional thermal pressure.
Blended Oilseed Processing
Peanuts, sesame seeds and sunflower seeds were 3: 2: 1, and with parameter adjustments adjustment, the oil mixture 45% balanced in flavor and enhanced in nutritional value.
Special Petroleum Development
Basil seed oil (35% yield) and hemp seed oil (30% yield) were successfully extracted by Screw presses.
4. Operational guidelines: best practices for cross-cutting treatment
Efficient processing alternative nuts and seeds requires the following protocols:
Raw Material Preprocessing
Peeling: Hard shell seeds (such as walnuts and almonds) must be peeled to prevent damage to equipment; soft shell seeds (such as sunflowers) can be pressed directly.
Smash: Large seeds (e.g., soybeans) should be crushed into 2-4mm particles to improve crushing efficiency.
Conditioning: Moisturize to 8%-12% (peanuts ≤ 7% required in case yield loss is reduced).
Dynamic Parameter Adjustment
Initial Pressing: Use low pressure (40 MPa) and low speed (20 RPM) to avoid blockage.
Main press: design pressure is gradually increased (screw presses 50 MPa, hydraulic press 180 MPa) while maintaining constant speed.
Final squeeze: Reduce pressure to 30 MPa to remove residue without overpressing.
Maintenance of equipment
Wash: Remove chamber residue after each shipment to prevent cross-contamination; hydraulic models require regular oil changes.
Lubrication: Apply high temperature grease to moving parts (such as studs and gearboxes) to reduce wear and tear.
Calibration: Quarterly inspection to ensure accuracy of pressure sensor and temperature controller.
V. Technical Limitations and the Directions forward
peanut oil extraction machines, despite their cross-category capabilities, face the following challenges:
Oilseed Adaptability Variations
Seeds with a shell content greater than20 per cent (e.g., unhulled sunflower seeds) risk chamber blockages and necessitating dehulling equipment.
Yield Fluctuations
Niche oilseeds (e.g., grape seeds, hazelnuts) may have lower yields due to their unique cellular structure that requires enzymatic pretreatment optimization.
Accelerated Equipment Wear
Hard seeds (such as almonds and coconut) can increase wear and tear on screw shafts and press rods and require components coated in high carbon steel or ceramics.
Future advancements include intelligent parametric systems for automatic adjustment, modular pressing chambers for rapid oilseed changes, and inline detection technologies for real-time quality monitoring.
Conclusion:
Using physical extraction extraction principles adjustable parameters and modular design, peanut oil extraction machines have developed into multifunctional equipment capable of processing more than 20 types of nuts and seeds, including peanuts, walnuts, sesame seeds and flax. Their cross-category adaptability has increased equipment utilization and supports diversification in the edible oil industry. The combination of intelligent control and advanced materials will play an increasingly important role in the development of specialty oils and the production of healthy oils.