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Roller Press Granulator is a dry roller press granulator for low-moisture fertilizer and chemical powders. It turns powder into strong, uniform granules through dry compaction. In fertilizer production, it is also called a double roller granulator or double roller press granulator. For suitable raw materials, this dry process usually needs no water, steam, binder, drying, or cooling.
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The roller press granulator is the main compaction unit in a dry fertilizer granulation line. It mainly consists of the following key parts:
Feeding System
Sends powder materials to the forced feeding unit evenly and continuously. Stable feeding helps maintain consistent compaction and production capacity.
Forced Feeding Unit
Pushes material into the roller gap and helps maintain a stable material layer between the rollers.
Roller Press Assembly
The core working section where two counter-rotating rollers compact powder into flakes or sheets under high pressure.
Hydraulic Pressure System
Provides adjustable pressure to the rollers, allowing the machine to adapt to different materials and granule strength requirements.
Transmission System
Includes motor, reducer, coupling, and drive shafts to provide stable torque for continuous operation.
Heavy-Duty Frame
Supports the roller press assembly and keeps the machine stable during long-term operation.
The double roller press granulator uses a roller compaction dry granulation process. Powder enters the gap between two counter-rotating rollers. Under hydraulic pressure, the material is compressed into dense flakes or sheets.
After compaction, the flakes enter the crushing and screening section. Qualified granules are sent to the next process, while fine powder and oversize particles are returned for re-compaction. This closed-loop process helps improve the finished product yield and maintain stable particle size distribution.
Because the process is completed at normal temperature without adding liquid, it is suitable for many fertilizer and chemical powders that require dry processing, lower energy consumption, and controlled dust generation.
Single-Nutrient Fertilizers
Suitable for dry granulation of potassium chloride (MOP), potassium sulfate (SOP), potassium nitrate, ammonium sulfate, ammonium chloride, and similar powder fertilizers.
NPK and Compound Fertilizers
The double roller granulator can be used for NPK, NP, PK, and other compound fertilizer formulas, especially where dry processing, formula flexibility, and lower drying cost are required.
Mineral Fertilizer and Industrial Powders
Applicable to selected mineral powders, industrial salts, de-icing salts, and chemical powders after material testing and process confirmation.
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