Double roller press granulators are widely used in fertilizer, feed, and chemical industries. Their pellet formation rate and particle quality directly impact production efficiency and product quality. Proper adjustment of parameters can significantly enhance granulation results.

1.Roller Gap Control

The roller gap is a key factor affecting pellet formation. Too large a gap produces loose, easily broken particles; too small risks double roller press granulator overload. Recommendation: Set the initial gap at 1.2–1.5 times the material’s particle size. Fine-tune by 0.1–0.3 mm based on material properties. Regularly check and compensate for roller wear.

2.Optimum Roller Pressure

Insufficient pressure leads to low-density particles, while excessive pressure increases energy use and wear. Optimization tip: Maintain working pressure between 5–15 MPa. Use higher pressure for hard materials and lower for soft ones. Balance pressure by adjusting the gap.

3.Synchronizing Speed and Feed Rate

Keep roller speed at 15–30 rpm. Match the feed rate to the roller speed to avoid “starvation” or “overfeeding.” Use lower speeds for high-viscosity materials.

4.Adapting to Material Properties

Different materials require tailored parameter combinations:

Moisture content: Best maintained at 12–18%.

Particle size distribution: 80% of material should be within 40–100 mesh.

Binder addition: Adjust between 1–3% based on material characteristics.

Through systematic parameter adjustments, most double roller press granulators can achieve a pellet formation rate increase from 80% to over 92%. Particle compressive strength can also rise by 30–50%, delivering significant quality improvements and economic benefits.