The roller extrusion granulator plays a crucial role in the NPK (nitrogen phosphorus potassium) fertilizer production line. It is a key equipment that compresses the mixed dry powder raw materials into long strips through pressure extrusion and then cuts them into particles. The roller extrusion granulation technology is widely used in the granulation process of fertilizers, feed, and other chemical industries due to its unique forming principle and efficient working efficiency. The following is a detailed introduction to its working principle and advantages:
working principle
The roller extrusion granulator mainly consists of a pair of high-strength steel rollers that rotate in opposite directions, with grooves or special texture designs on the surface of the rollers. When the pre processed powdered material is fed between two rollers, it is subjected to tremendous squeezing force, causing the particles in the material to tightly bind together, forming a long strip shaped "cake". Subsequently, these "cakes" will be cut into uniformly sized particles by a cutting device according to the set size, thus completing the granulation process.
Main advantages
Efficient compaction and molding: By precise extrusion of materials, dense and high-strength particles can be obtained, reducing the damage rate during subsequent packaging and transportation.
Good particle uniformity: Due to the design of the roller and precise control of process parameters, the produced particles have high consistency in size and shape, which is beneficial for improving the uniformity of fertilizers.
Wide applicability: The requirements for raw materials are not high, and it can be well applied to both dry and moisture containing materials, especially for some difficult to handle materials such as low melting point and heat sensitive materials, which can also be effectively molded.
Energy saving and environmental protection: Compared with traditional granulation methods, roller extrusion granulators usually do not require heating or other energy consuming processes, and rely solely on mechanical force to complete them, resulting in higher energy efficiency and reduced exhaust emissions.
High degree of automation: Modern roller extrusion granulators are often equipped with automatic control systems, which can achieve continuous operation, monitor production parameters, and ensure stable and reliable product quality.
The application of roller extrusion granulator in NPK fertilizer production line greatly improves production efficiency and product quality, and is an indispensable part of modern fertilizer manufacturing. Through precise regulation, it is possible to meet the needs of different markets and crops, produce granular fertilizers with neat appearance, good solubility, and long-lasting fertilizer efficiency, and help increase agricultural production and income. With the advancement of technology, the technology of roller extrusion granulator is constantly innovating, developing towards a more intelligent and environmentally friendly direction, becoming an important driving force for promoting the green transformation of the fertilizer industry.