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 sta...