2026/06/15
Selecting screens for new type organic fertilizer granulators requires considering the particle size, material characteristics, and equipment type, taking into account four key dimensions: material, aperture, structure, and mesh size, while also balancing screening efficiency and service life.
First, determine the aperture and mesh size based on the finished particle size. General organic fertilizer granules commonly use 2.0–4.0mm apertures, while bio-organic fertilizers often use 2.5–3mm. Large-particle organic fertilizers can use 4–5mm screens, while small-particle water-soluble organic fertilizers use 1.5–2mm screens. For extrusion granulation return screens, prioritize apertures slightly smaller than the finished particle size to ensure proper return of broken material. For disc granulation grading screens, use standard sizes based on mainstream market particle sizes to avoid uneven particle sieving.
Second, select the material to suit the production conditions. For ordinary powdery, dry organic fertilizers, carbon steel screens are recommended due to their high cost-effectiveness and sufficient hardness. For materials with high moisture content, humic acid content, or high acid/alkali levels, stainless steel screens are preferred because they are rust-resistant, corrosion-resistant, and less prone to material sticking. For raw materials containing straw, coarse fibers, and hard impurities, manganese steel perforated screen plates are recommended. They are wear-resistant and impact-resistant, less prone to tearing and deformation compared to woven mesh, and suitable for high-load continuous production of bio-organic fertilizer granulation.
Furthermore, consider the structural type. Rotary drum screens often use cylindrical perforated screen plates, offering high overall strength and less material blockage. Linear vibrating screens are compatible with woven mesh or slotted screens for faster material throughput. Woven mesh offers good flexibility, suitable for fine-particle materials, but its wear resistance is relatively weak; perforated screen plates are robust and durable, making them the mainstream choice for organic fertilizer production lines.
Finally, optimize details based on operating conditions. When materials have high moisture content and are prone to sticking to the screen, select screens with large apertures and wide ribs to reduce clogging. In scenarios with high dust and fiber content, use anti-clogging bouncing balls to assist in screen cleaning. Simultaneously, match the screen length and width to the equipment dimensions to ensure a snug fit and prevent loosening. Regularly inspect and replace screens according to the material wear rate to maintain stable screening results and ensure normal bio-organic fertilizer produciton line operation.
