Purpose of Oilseeds Softening in Edible Oil Production

Softening improves the elasticity and plasticity of oilseeds by adjusting their moisture and temperature. This creates optimal conditions for flaking, reduces powder formation and roller sticking during flaking, and ensures high-quality flakes. Softening also minimizes roller wear and machine vibrations, facilitating smooth operation. Properly softened seeds should have uniform elasticity and plasticity to meet flaking requirements.

Key Points:

1. Moisture and Temperature Adjustment: 

High moisture seeds require higher heating temperatures to evaporate internal moisture and distribute it evenly. Conversely, low moisture seeds need added steam for moistening.

2. Oil Content Consideration: 

High oil content seeds need lower softening temperatures to prevent oil leakage and roller sticking during flaking. Low oil content seeds, like soybeans, typically require softening.

3. Equipment:

Large oil mills use softening towers, which include heating layers and hot air drying layers to ensure even moisture distribution and optimal plasticity.

Process Details:

•  Feed Section:

Ensures uniform material distribution and protects lower heating layers.

•  Heating Layers:

Use steam condensate and steam to heat and soften the material, ensuring even moisture distribution.

•  Hot Air Drying Layers:

Use hot air to remove surface moisture, reducing overall material moisture.

•  Discharge Section:

Uses frequency-controlled discharge valves for even material discharge.

Softening parameters vary based on seed type and moisture content to achieve the best flaking results.