Executive Summary for Mill Procurement Officers
For edible coconut oil expeller units in Kangeyam, Vellakoil, Madurai, and coastal Tamil Nadu, coconut procurement is the single highest determinant of operating profit margins. A 2% variance in oil recovery or excessive moisture retention can erode hundreds of thousands of rupees across a monthly 50-ton milling program.
This technical manual outlines the commercial grading criteria used at our MPK Valasai godown when selecting and aggregating coconuts specifically for commercial oil milling.
1. Commercial Grading Parameters for Oil Milling
| Grading Metric | Grade A (Milling Standard) | Grade B (Secondary Copra) | Rejection Threshold (Vattai) |
|---|---|---|---|
| Kernel Meat Thickness | 11 mm – 13 mm | 9 mm – 10 mm | Below 8 mm (Immature / Neer Thengai) |
| Nut Weight (Husked) | 500g – 650g | 400g – 480g | Under 350g |
| Expected Copra Recovery | 180g – 220g dry copra / nut | 140g – 160g dry copra / nut | Sub-standard yield |
| Expected Oil Recovery | Typically 60% – 65% (Expeller dry basis, varies with moisture & expeller efficiency) | 58% – 61% | Below 55% |
| Shell Hardness / Sound | Deep metallic ring when tapped | Medium pitch ring | Dull thud (Rotten / Cracked) |
2. Why Ramanathapuram Coastal Soil Produces Denser Copra
Unlike river-delta irrigated palms that produce large, water-heavy coconuts with thinner meat, Ramanathapuram’s dry coastal agro-climatic zone forces the palm to concentrate lipids and fats. The resulting copra features dense cellular structure with low free fatty acid (FFA) levels, ensuring clean, pale-golden oil with natural aroma.
3. The Transport Sorting Protocol at Ramnad Agro
Before loading a commercial transport vehicle at our MPK Valasai godown, coconuts undergo a 4-point sorting process:
- De-eying & Husk Inspection: Ensuring semi-husked fibers protect the coconut eyes during rough transit.
- Hand Tapping: Discarding dead nuts, cracked shells, and spoiled water nuts (azhukal).
- Weight Sampling: Random batch weighment to verify load average above 500g.
- Authorized Weighbridge Verification: Commercial electronic weighbridge tare and gross weighment before bilty signoff.