The Extrusion Principle of a Double Roller Press Granulator

 The double roller press granualtor is the core equipment of dry granulation. It relies on mechanical pressure to force extrusion molding, eliminating the need for binders or drying/heating. Its granulation principle is clear and stable.

This fertilizer production machine mainly consists of a pair of opposing rotating pressure rollers. The roller surfaces are evenly and symmetrically distributed with hemispherical or cylindrical mold cavities. During operation, the dry powder material, after being mixed and prepared, is evenly and forcibly fed into the extrusion zone between the two rollers via a screw feeder. As the pressure rollers rotate synchronously in opposite directions, the material is gradually compressed under the strong pressure of the double rollers, rapidly reducing its volume and expelling internal voids.

Under high pressure, molecular adsorption and mechanical interlocking occur between the powder particles, compacting them from a loose state into granular blanks consistent with the shape of the mold cavities. When the pressure rollers continue to rotate to the demolding position, the particles naturally fall off due to their own gravity and centrifugal force, forming preliminary granules.

Subsequently, the blank granules enter the subsequent rounding and screening processes to refine their shape and select qualified finished products. The entire granulation process is purely physical extrusion molding, which does not change the nutrient properties of the material. It is suitable for a variety of raw materials such as nitrogen, phosphorus and potassium compound fertilizer, organic fertilizer, and blended fertilizer. It features strong molding, low energy consumption and simple process, making it a key model in the no-drying compound fertilizer production line.



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