Cleaning & Grading¶
CCP-1: Foreign Material Removal
Process Objective¶
Remove foreign material (stones, metal, weed seeds, broken seeds, dust) from raw flaxseed to achieve ≥ 99.9% purity before dehulling or milling.
Equipment Configuration¶
Raw Seed → Hopper → Magnet → Vibrating Screen → Aspirator → Destoner → Color Sorter → Clean Seed Silo
Equipment Specifications¶
| Unit | Type | Model | Capacity | Power | Notes |
|---|---|---|---|---|---|
| Magnet | Permanent drum | MD-1000 | 8 MT/hr | 0.75 kW | 10,000 Gauss; cleaned daily |
| Vibrating screen | Plane gyratory | VPS-1500 | 8 MT/hr | 2.2 kW | 4 decks: 4/2/1/0.5 mm |
| Aspirator | Vertical air column | AS-1200 | 8 MT/hr | 5.5 kW | Air velocity 4–6 m/s |
| Destoner | Fluidised bed | DS-800 | 5 MT/hr | 3.0 kW | Specific gravity separation |
| Color sorter | Belt-fed, NIR + VIS | CS-4C | 3 MT/hr | 6.0 kW | 4 channels, 128 sensors |
Performance Targets¶
| Parameter | Target | Verification |
|---|---|---|
| Purity after cleaning | ≥ 99.9% | Every 2 hr grab sample |
| Stone removal | 100% at ≥ 1 mm | Every shift |
| Metal removal | 100% at ≥ 0.5 mm | Magnet cleaning log |
| Broken seed loss | < 1% | Weight balance |
| Dust emission | < 10 mg/m³ | Continuous monitor |
Maintenance¶
- Magnet cleaning: every 4 hours
- Screen replacement: every 500 operating hours
- Color sorter calibration: weekly (quartz reference)
- Full sanitation: weekly