Operating Requirements for Double Roller Press Granulators

The double roller press granulator is a type of fertilizer dry granulation equipment that operates at ambient temperature. The stability of its operation directly impacts both the quality of the granules and the service life of the equipment; therefore, strict adherence to all requirements regarding raw materials, operation, and maintenance is essential.

**Raw Material Requirements:** The moisture content of the material must be controlled within the range of 1% to 5%. If the material is too dry, it may slip and fail to form granules; if it is too wet, it will adhere to the rollers and be difficult to release from the mold. The optimal particle size for the material is 20–40 mesh. Large hard lumps, metal objects, or stones must be prevented from entering the machine to avoid damaging the roller surfaces. The material should possess moderate flowability, uniform composition, and be free of clumps to ensure a stable feed rate, thereby preventing variations in granule thickness and pressure fluctuations caused by uneven feeding.

**Operation Requirements:** Before starting the machine, the gap between the rollers, all fasteners, and the lubrication system must be thoroughly inspected. The equipment should be started under a no-load condition; only after it is running smoothly should material be fed into the machine uniformly. During operation, the pressure between the two rollers must be maintained stably within the specified process range; pressure that is too low results in poor granulation, while pressure that is too high risks damaging the bearings and the motor. The feed rate must be strictly controlled to prevent overloading, thereby avoiding machine stalling or material blockages. The status of granule formation should be monitored in real-time; if roller misalignment, roller jumping, or abnormal noises occur, the machine must be stopped immediately for inspection.