Organic fertilizer production often begins with livestock manure containing over 60% moisture and ends with dry granules containing less than 15%. Attempting to bridge this “moisture gap” with a single piece of equipment leads to problems: either the granulator’s molds become clogged and sticky, or the energy consumption for drying becomes exorbitantly high. Smooth production-line operation relies on the coordinated relay of three distinct processes.
The First Relay: Twin-screw windrow turner—the “slow work” of fermentation and moisture reduction. High-moisture material first enters the aerobic fermentation stage. The twin-screw windrow turner uses symmetrical screw shafts to lift material from the bottom of the pile to the surface, introducing fresh air into the core and allowing moisture to evaporate continuously during the turning process. Simultaneously, turning ensures thorough contact between the material and microbial agents; the heat generated by organic matter decomposition further accelerates moisture loss. After 7–15 days of fermentation, the moisture content drops from over 60% to 35%–40%, resulting in uniform decomposition without anaerobic “dead zones.” This step cannot be rushed—insufficient turning depth or frequency prevents adequate moisture reduction, thereby hindering all subsequent processes.
The Second Relay: half-wet material crusher—”pre-treatment” to break up clumps. Although the fermented material has lost moisture, the turning and compression processes often create hard clumps and fibrous tangles. The semi-wet material crusher employs a dual-layer rotor structure: the upper layer performs coarse crushing to break up clumps, while the lower layer handles fine crushing and homogenization, achieving an output fineness of over 60 mesh. Its key advantage is clog-free operation—a screenless bottom design allows material with 30%–50% moisture content to discharge directly, preventing wet material from gumming up the screen. Crushing increases the material’s specific surface area, creating a uniform state ideal for subsequent drying and granulation.
The Third Relay: Organic fertilizer dry granulation machine—the “final push” of low-pressure molding. Dry granulation (such as twin-roll extrusion) requires the material’s moisture content to be controlled between 8% and 15%; consequently, the pulverized material must undergo drying and cooling. The advantages of dry granulation lie in the elimination of water and binders—relying instead on mechanical pressure for direct forming—which results in high granule strength and low energy consumption. However, the process is highly sensitive to feed fineness and moisture levels: insufficient fineness hinders material intake, while excessive moisture causes sticking and slippage on the rollers. The work performed in the preceding two stages is entirely aimed at ensuring the material enters the granulator in optimal condition.
These three stages are interconnected: the windrow turning stage handles “moisture reduction and composting,” the pulverization stage ensures “homogenization and clog prevention,” and the dry granulation stage focuses on “forming and strength.” Skipping any stage will inevitably lead to issues elsewhere in the production line. From a content strategy perspective, creating in-depth technical pages around long-tail keywords—such as “high-moisture material pretreatment” and “moisture control in dry granulation”—and using FAQ structured data markup can help improve visibility in relevant search results.