How does a screw oil press work? In edible oil production, a screw oil press works by applying continuous mechanical pressure to oil-bearing materials, forcing oil out through a slotted barrel while discharging solid press cake from the outlet.
This physical oil extraction method is widely used in oil mills due to its simplicity, flexibility, and reliable performance.
Working Principle of a Screw Oil Presses Machine
The working principle of a screw oil presses is based on progressive compression and friction.
Raw materials enter the press chamber through the feeding section and are transported forward by a rotating screw shaft.
As material moves along the screw oil presses:
- The screw pitch gradually decreases
- The shaft diameter increases
- Internal pressure rises continuously
Under high pressure, oil is released through barrel gaps, while solids consolidate into cake.
This mechanical process allows continuous oil extraction without chemical solvents.
Mechanical Oil Extraction Process in a Screw Oil Press
The oil extraction process in a oil press machine consists of several coordinated steps:
1. Feeding: Cleaned and conditioned oilseeds enter the hopper.
2. Conveying & Compression: The screw transports and compresses material.
3. Oil Separation: Oil flows out through the press cage.
4. Cake Discharge: Pressed cake exits through the adjustable outlet.
This continuous operation makes oil press machines suitable for steady, long-hour production.
Key Components of a Oil Press Equipment
A screw oil press equipment is composed of several critical components that determine performance and oil yield:
| Component | Function |
|---|---|
| Pressing screw shaft | Generates compression and shear force |
| Press barrel (cage) | Allows oil to escape while retaining solids |
| Feeding hopper | Ensures stable material input |
| Drive motor and gearbox | Provide rotational power |
| Cake outlet and pressure adjustment device | Control back pressure and residual oil |
Applications of Oil Press Machine in Edible Oil Processing
Screw oil presses are widely used in edible oil processing for a variety of oil-bearing materials.
Including: Sunflower seed, Peanut and groundnut, Rapeseed and mustard seed, Soybean, Sesame seed, Palm kernel and cottonseed etc.
Their adaptability makes screw oil press machines a standard choice for decentralized oil production facilities.
Oil Extraction Machine in Oil Production Lines
In a complete oil production line, a screw oil press is typically installed upstream of the refining section.
After pressing, the crude oil undergoes further processing such as: Degumming, Neutralization (deacidification), Vacuum bleaching, Deodorization, Optional dewaxing for specific oils.
Small Batch Type Edible Oil Refinery Plant (1–20 TPD) commonly use screw oil presses as the primary extraction unit.
Guance Machinery supplies screw oil presses designed for seamless integration with downstream refining equipment.
Advantages of Using a Oil Press Equipment for Oil Extraction
Using a screw oil press for oil extraction offers several technical and economic advantages:
- Continuous and stable operation
- Lower capital investment than solvent extraction
- Simple operation and maintenance
- Suitable for multiple oilseed types
- Easy capacity expansion by adding parallel units
These advantages make screw oil presses especially attractive for startups and regional processors.
Actual performance varies depending on raw material oil content, pre-treatment quality, and operating parameters.
Contact Guance Machinery offers model selection, trial testing, and technical support to help match screw oil press with specific raw materials and capacity requirements.
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