Double roller press granulators play a key role in fertilizer production, but weak granule strength can sometimes affect product quality and usability. Here are practical solutions to address this issue:

1. Optimize Material Formulation

Adjust Binder Content: Increasing binder dosage strengthens bonding between particles. However, balance is crucial—use binders suitable for the material (such as plant proteins or starches for feed pellets) and keep their content within 3%-8% to avoid compromising other properties.

Control Particle Size Distribution: Properly mix coarse and fine particles by pre-processing materials through crushing or sieving. Aim for a particle size range of 0.1-5mm, which ensures effective bonding and allows air to escape during compression.

2. Adjust Equipment Parameters

Double roller press granulators’ pressure between the rollers directly affects granule density. Slightly increasing roller pressure improves compaction, while adjusting roller speed prevents incomplete forming. For example, reducing speed may help if granules crumble easily.

3. Enhance Post-Granulation Processes

Optimize Drying: Use low-temperature (50-80°C) and slow-drying methods to let moisture move gradually from the core to the surface. This prevents cracks caused by rapid shrinkage. Drying time typically ranges from 1-3 hours, depending on moisture content and granule size.

Improve Cooling: Ensure even cooling by optimizing airflow distribution in cooling equipment. Adjusting vent positions or airflow direction reduces thermal stress and maintains granule integrity.

By refining formulations, equipment settings, and post-processing steps, producers can effectively boost double roller press granulators’ granule strength while maintaining production efficiency.