Key Performance Metrics of Rice Huller Rubber Rollers
1. Tensile Strength
Tensile strength measures a material’s resistance to deformation under stress. For rubber rollers, this property is critical as they endure high-speed mechanical stress during rice hulling. Standard requirements specify a minimum of 19 MPa (190 kg/cm²) to ensure durability and prevent premature failure.
2. Elasticity
Elasticity determines a roller’s ability to recover its original shape after deformation. While high elasticity improves hulling efficiency and reduces broken grains, excessive elasticity increases heat generation, leading to temperature spikes that degrade rubber properties. Conversely, low elasticity reduces abrasion resistance.
3. Hardness
Hardness (measured via Shore A durometer) directly impacts performance:
- Optimal Range: 85°–95° Shore A (±3° tolerance).
- Regional Adjustments:
- High-temperature climates: Softer rubber (85°–90°) to prevent overheating.
- Cold climates: Harder rubber (90°–95°) to maintain structural integrity.
- Note: Actual operating hardness may drop 2°–4° due to thermal expansion during use.
4. Aging Resistance
Aging occurs when rubber degrades from oxygen, UV exposure, or heat. Key impacts include:
- Physical Changes: Hardening, cracking, and mold growth.
- Performance Loss: Reduced elasticity and tensile strength by up to 40% over 2 years.
- Mitigation: Use UV-resistant compounds and store rollers in cool, dry conditions.
5. Balance Stability
Balance ensures uniform weight distribution during rotation. Poor balance causes:
- Vibration: Increases wear on bearings and shafts.
- Processing Issues: Uneven hulling (e.g., 10%–15% lower dehulling efficiency).
- Solutions: Regular static balancing and replacing rollers if imbalance exceeds 2 Shore A degrees.
