Double roller press granulators and disc granulators are two common types of pelletizing equipment, and their working principles differ significantly.
Double Roller Press Granulator
- Working Principle
The double roller press granulator relies on two counter-rotating rollers. Material is fed into the gap between the rollers. As the rollers rotate, the material is subjected to intense pressure. This pressure forces the material into the mold holes on the roller surfaces, shaping it into specific forms, such as round or oval pellets. Under high pressure, the material fills the mold holes, solidifies, and is extruded as finished pellets.
- Applications
This machine is ideal for producing high-density, high-strength pellets, such as fertilizers, animal feed, or wood chips. By compressing raw materials between the rollers, it creates dense pellets that are easier to store, transport, and use. It’s also commonly used for biomass fuel production, like wood or straw pellets.
- Working Principle
The disc granulator features a rotating disc. Material is placed on the disc and rolls as the disc spins. During this tumbling motion, a binder (such as liquid adhesive) is sprayed onto the material. The binder causes small particles to stick together, gradually forming larger pellets as they roll and grow on the disc until reaching the desired size.
- Applications
This machine is better suited for low-density, low-strength pellets, such as organic fertilizers or wood-based products. It processes organic waste, crop straw, or livestock manure into granular organic fertilizer, improving fertilizer efficiency and reducing environmental pollution.
In summary, the double roller press granulator excels at producing strong, uniform pellets, while the disc granulator creates smoother, rounder pellets. Choosing the right equipment depends on the specific requirements of the end product.