The final stage of an NPK fertilizer production line is completed by screening machines, coating machines, and automatic packaging machines. These machines are responsible for improving the appearance of the granules, achieving the slow-release function, and completing the finished product shipment.
The vibrating screen separates the granules into qualified granules, large granules, and return powder. Qualified granules enter the next process, large granules are crushed and re-granulated, and fine powder is returned to the batching system, achieving material recycling. The screening machine uses vibrating screens to ensure uniform particle size and aesthetically pleasing finished products.
A fertilizer coating machine is used in the production of slow-release fertilizers. The coating machine evenly sprays a coating agent onto the surface of the granules, forming a protective film that slows down nutrient release and improves fertilizer utilization. Its working principle is that the rotating drum, combined with the spraying system, ensures that the coating agent adheres evenly to the surface of the granules.
Finally, there is the automatic packaging machine. It consists of a weighing system, a bag clamping system, and a sewing system, which can automatically complete quantitative bagging, sealing, and conveying. The working principle involves using sensors to control the weight of the discharged material, ensuring precise weight control and minimal error for each bag.
The downstream equipment is the final stage of the NPK fertilizer production line, directly determining the product’s appearance, quality, and factory standards. A well-configured downstream system enables the NPK fertilizer production line to achieve efficient, standardized, and large-scale production.