A complete organic fertilizer production line involves multiple stages, transforming decomposed raw materials into finished granules. Within this process, the double axis paddle mixer and the flat die pelleting machine work in tandem, handling the critical tasks of “homogenization” and “granulation,” respectively.

Mixing is a stage often underestimated in the production line. Fermented materials frequently suffer from uneven moisture and clumping; proceeding directly to granulation would result in inconsistent nutrient distribution and low pellet formation rates. The double axis paddle mixer utilizes two counter-rotating shafts with paddles that toss the material into a “weightless” state, achieving uniformity within 30 to 120 seconds and maintaining a coefficient of variation of less than 5%.

Once thoroughly mixed, the material enters the granulation stage. Unlike wet processes that require water addition and subsequent drying, the flat die pelleting machine employs a dry extrusion method: material is compressed between rollers and a flat die, then forced through die holes to form cylindrical granules. No water is added during the process, resulting in low moisture content and eliminating the need for drying equipment and associated energy costs. The flat die pelleting machine is highly adaptable to raw materials, capable of processing feedstocks with moisture contents of 20%–40% and organic matter content up to 100%, without the need for binders. The resulting granules feature a smooth surface and moderate hardness; minimal temperature rise during processing ensures excellent nutrient retention.

Linked sequentially, these two units drive the core transformation from “powder” to “granule” within the production line. For projects utilizing livestock manure or crop straw, the “double-shaft mixing plus flat die granulation” approach offers a pragmatic solution that balances investment costs, energy consumption, and product quality.