Fertilizer roller press granulators are dry forming machines. Moisture control directly affects pelleting rate, particle strength, and equipment operational stability, requiring precise management throughout the entire process from raw materials, conditioning, granulation, and circulation.

Raw material pretreatment is fundamental. Raw materials such as fermented organic fertilizer and livestock manure are first dehydrated through turning, sun-drying, or a dryer, controlling the initial moisture content to 12%–18%. Compound fertilizer raw materials are controlled at 8%–15%. This removes lumps and impurities in advance, ensuring the material is loose and uniform, avoiding localized over-wetness or over-dryness.

Mixing and conditioning are crucial. An organic fertilizer double axis mixer is used for thorough mixing to achieve uniform moisture and nutrient content. If the material is too dry, a small amount of water is sprayed through a misting device; direct addition of large amounts of water is strictly prohibited. If the material is too wet, bentonite, zeolite powder, or other dry materials are added for dilution, ensuring overall moisture fluctuation does not exceed ±2%. The standard for quick on-site judgment is "forms a ball when squeezed, crumbles easily when lightly pinched, and is not sticky."

Real-time control in the granulation section. Maintain a uniform and quantitative feed rate to prevent uneven moisture content caused by inconsistent feeding. The equipment is equipped with an automatic roller scraper to reduce roller sticking and die clogging. If roller sticking or soft granules occur, it indicates high moisture content; the feed humidity should be reduced or drying should be accelerated. If the granules are loose and have a low pelleting rate, it indicates low moisture content; appropriate fine-tuning and water replenishment are necessary.

The subsequent stages of the roller press granulator produciton line stabilize moisture content. After granulation, the material undergoes crushing, screening, and cooling to lower the granule temperature and prevent residual heat from causing moisture regain. Unqualified material is returned to the mixing stage for reconditioning with new material, stabilizing overall moisture content and reducing material waste.

The entire process is under closed-loop control, ensuring that the material moisture content remains within the optimal range, resulting in a smooth production line without clogging, dense granules with high strength, and a stable yield.