2026/04/02
The double roller press granulator employs a room-temperature dry granulation process. Its core principle relies on physical high pressure to induce the self-bonding and shaping of dry powder materials; the entire process requires neither water addition nor heat drying, relying instead on the material's inherent crystal water, plasticity, and intermolecular forces to achieve granule formation. During operation, pre-treated and uniformly mixed powder—meeting the required specifications—is fed evenly and steadily by a forced-feeding mechanism into the gap between a pair of counter-rotating pressure rollers. The surfaces of the pressure rollers are machined with regularly arranged cavities—typically spherical, cylindrical, or strip-shaped—and are maintained under constant high pressure by a hydraulic system. As the material enters the wedge-shaped extrusion zone between the rollers, it is progressively compacted and de-aerated; under the influence of high pressure, it is forced into the roller cavities, forming high-density, structurally compact briquettes in the shape of flakes, cylinders, or spheres. Under this high-pressure environment, strong crystalline bridges and intermolecular bonds form between the material particles, endowing the briquettes with high structural strength and resistance to loosening or fragmentation. As the briquettes rotate with the rollers to the discharge position, they automatically detach—driven by their own rigidity and structural integrity—and subsequently enter a crushing and shaping unit, where they are broken down and trimmed into granules that meet the specified particle size requirements. The shaped material then proceeds to a screening system, which separates the qualified finished granules from oversized particles and fine powders. The qualified granules are conveyed directly for packaging as the final product, while the oversized particles (after further crushing) and the fine powders are returned together to the feeding end to re-enter the extrusion granulation cycle, thereby establishing a stable, closed-loop production process. The entire process features a short workflow, low energy consumption, stable molding performance, and high granule strength, making it particularly well-suited for the continuous granulation of various dry powder materials, such as compound fertilizers, organic fertilizers, and inorganic salts.
