Unlike the "granule-to-granule" approach of BB fertilizers, the roller compaction granulator (also known as a fertilizer roller press) performs a "powder-to-granule" dry forming process. The core components of the equipment are a pair of counter-rotating, high-strength pressure rollers. Powdered material is fed into the wedge-shaped gap between the rollers by a quantitative feeder, where high pressure compresses it into a dense sheet or strip-like "cake." The operating principle involves two stages: the "compaction" stage, where dry material agglomerates into dense, hard, large cakes under pressure; and the "granulation" stage, where these cakes are crushed and screened to produce granules. The extrusion process serves two primary functions: first, it expels air from between the particles; second, it brings the particles close enough together to generate intermolecular forces—such as van der Waals forces, adsorption forces, crystalline bridges, and interlocking connections—which maintain the structural integrity of the granules.

The new "two-in-one" organic fertilizer granulator represents the latest trend toward the integration of granulation equipment. Combining the technical advantages of both extrusion and disc granulation, this machine integrates the pulverization and granulation stages into a single unit, enabling continuous "feed-to-output" operation. It employs a modular design, breaking down core granulation components into independent modules tailored to specific granule shape requirements. When semi-wet, fermented material enters the inlet, a high-speed pulverizing rotor breaks up clumps and fibers before the material passes directly into the granulation chamber for shaping, thereby eliminating intermediate conveying and transfer steps. Suitable for processing a wide range of organic and compound materials, this equipment is a key asset for small- and medium-sized organic fertilizer plants looking to upgrade production lines and boost efficiency.

BB fertilizer blending lines are known for their flexible formulations and low-investment, quick-return nature, making them ideal for precision blending using finished granules. Double-roll extrusion granulators excel in dry-process forming that requires no drying, making them suitable for large-scale production starting from dry powder materials. Meanwhile, the new two-in-one organic fertilizer granulator stands out for its process integration and multi-functionality, offering a clear upgrade path for small- and medium-sized factories.