A rice mill's profit often hides in its head rice yield. Head rice sells far above broken rice; every extra percentage point of breakage is real income lost. Breakage is often not "bad machines" but misaligned process parameters.
1. Where Breakage Comes From
- Infeed moisture: Paddy with too-high moisture breaks easily when milled; too low causes broken kernels; optimal range about 13–14%.
- Kernel strength: Uneven harvest drying/storage, old grain and insect damage all weaken kernels.
- Equipment parameters: Rubber-roll husker pressure, whitening-chamber pressure and throughput, rotation speed mismatched.
- Over-polishing: Repeated polishing for appearance instead breaks the kernels.
2. Key Control Points
| Control point | Practice | Effect |
|---|---|---|
| Infeed moisture | Control at 13–14% | Reduce milling breakage and broken kernels |
| Moisture uniformity | Control uniformity in the drying stage | Avoid soft and hard rice in one machine |
| Husker rubber roll | Adjust pressure by variety | De-hull without damaging rice |
| Whitening chamber | Multi-pass light whitening, controlled throughput | Remove bran gradually without breaking |
| Conditioning and tempering | Moisten and temper before whitening | Improve kernel toughness |
Head rice yield is not "ground out" but "accumulated by not damaging the kernel at every step from infeed to outfeed."
AmGrainTech's Yield-Controlled Processing Line
Our paddy processing line covers 5–350 t/d; husking, whitening, polishing and color sorting are independently adjustable, matching rubber-roll pressure and multi-pass light-whitening process by variety, with a drying stage controlling moisture uniformity to reduce breakage at the source. Used in Brazil 120 TPD, India 200 TPD, Southeast Asia 200 TPD and other projects. See Grain Processing Equipment.
Our paddy processing line covers 5–350 t/d; husking, whitening, polishing and color sorting are independently adjustable, matching rubber-roll pressure and multi-pass light-whitening process by variety, with a drying stage controlling moisture uniformity to reduce breakage at the source. Used in Brazil 120 TPD, India 200 TPD, Southeast Asia 200 TPD and other projects. See Grain Processing Equipment.
3. Equipment Calibration and Maintenance
- Regularly check emery/iron roll wear; re-calibrate mesh gaps by variety;
- Stable throughput; avoid fluctuations that cause pressure swings;
- Multi-pass light whitening beats one heavy pass, with lower broken-rice rate.