2026/01/09
The basic principle of the double roller press granualtor is to utilize the compressive force generated by a pair of synchronously rotating pressure rollers to extrude and shape the qualified powdered raw materials at room temperature. The material is then crushed and screened to produce uniform granules. The entire process does not require the addition of binders, making it a organic fertilizer dry granulator technology.
The specific working process is divided into three core stages: First, the feeding stage. The pre-treated powdered raw materials (with controlled moisture content within a reasonable range, uniform particle size, and no large impurities) are fed at a constant speed into the wedge-shaped gap between the two pressure rollers by a quantitative feeding mechanism. This ensures a stable raw material feed rate and prevents uneven feeding from causing unbalanced forces on the pressure rollers. Second, the extrusion and molding stage. The two pressure rollers are driven by a motor to rotate synchronously in opposite directions, generating high pressure of tens of megapascals. This pressure extrudes the powdered raw materials entering the gap into dense sheets or strips. The density and strength of the sheets are determined by the pressure and rotation speed of the pressure rollers, and the parameters can be flexibly adjusted according to the characteristics of the raw materials and the requirements of the finished product. Finally, the crushing and screening stage. The extruded sheets are transported to a matching crushing device, where they are broken into irregular small particles. These particles then enter a vibrating screen for classification and screening. Particles with the required particle size are the finished product, while oversized or undersized unqualified particles are returned to the feeding system for re-extrusion and granulation.
With its advantages of no high temperature and no need for binders, this equipment is suitable for the granulation of various inorganic fertilizers, organic fertilizers, and organic-inorganic compound fertilizers with certain plasticity. While ensuring a high granulation rate, it can effectively reduce production costs.
