In industrial granulation production, granulators have developed into a rich category system due to differences in process principles and application scenarios. Different types of equipment have different focuses in structural design, processing characteristics, and applicable fields, collectively building molding solutions covering multiple industries.
Based on process principles, mainstream granulators can be divided into extrusion granulators, roller granulators, and spray granulators. Extrusion granulators use a screw or roller to extrude molten material, which is then extruded into strips through a die and cut into pellets. These are further subdivided into single-screw, twin-screw, and multi-screw models: single-screw models have a simple structure and lower cost, suitable for low-viscosity materials such as conventional plastics and synthetic fibers; twin-screw models, due to their strong mixing and self-cleaning characteristics, are more suitable for high-filling, blending modification, or reactive extrusion scenarios; multi-screw models are mostly used for the precision dispersion processing of special polymer materials. Roller granulators rely on the extrusion action of rollers or pressure rollers to agglomerate materials into granules. They are commonly used for cold pressing of powdery materials such as fertilizers and mineral powders, and are characterized by low energy consumption and easy maintenance. Spray granulators disperse liquid materials (such as solutions or melts) into tiny droplets through atomizers, which are then dried with hot air or solidified by cooling into granules. They are widely used in pharmaceuticals, pesticides, food, and catalysts, and are particularly suitable for materials sensitive to moisture and heat or requiring controlled particle morphology.
Based on cooling methods, granulators can be divided into water-cooled and air-cooled granulators. Water-cooled models immediately cool the material with water after pelletizing, resulting in fast granulation and less agglomeration; they are often used for high-melting-point plastics. Air-cooled models use airflow for cooling, preventing material degradation upon contact with water, and are suitable for highly hygroscopic materials or moisture-sensitive pharmaceutical intermediates.
Furthermore, based on the degree of automation, granulators can be divided into manual, semi-automatic, and fully automatic granulators. Fully automatic models integrate online monitoring and intelligent control systems, enabling real-time adjustments to temperature, pressure, and pelletizing speed. This significantly improves production stability and product consistency, making them a standard feature in high-end manufacturing.
A diverse range of models allows pelletizers to flexibly meet the personalized needs of different industries, from basic material processing to high-end precision manufacturing, continuously providing crucial support for industrial upgrading.
