Double Roller Granulator
We offer advanced double roller granulators. These granulators are designed to transform powdered materials into high-quality, uniform granules for fertilizer production. These machines use a dry granulation process, which means they don’t need to be dried. This makes them energy-efficient and cost-effective. Our granulators are perfect for small to medium-sized manufacturers making organic, compound, and mineral fertilizers. They have a granulation rate of over 90%. Our machines are built to last and are easy to use. They provide the same reliable results every time and help farmers around the world practice sustainable agriculture.
Double Roller Granulator Definition
A double roller granulator is a specialized fertilizer machine that turns dry powder into pellets. This equipment has two rollers that rotate in opposite directions. They use a force that pushes materials into a granular form. This process doesn’t require water or heat.
Double Roller Granulator Specifications
| Model | Power(kw) | Granule Diameter(mm) | Roller Sheet Size(mm) | Dimensions(mm) |
| TDJZ-1T | 15 | 3-10 | 150*220 | 1450*800*1450 |
| TDJZ-1.5T | 22 | 3-10 | 150*300 | 1450*850*1500 |
| TDJZ-2T | 30 | 3-10 | 185*300 | 1630*850*1650 |
| TDJZ-3T | 37 | 3-10 | 300*300 | 1850*1100*2050 |
Working Principle of Double Roller Granulator
The double roller granulator works by using mechanical pressure to compress powdered materials into dense granules. This process, called dry extrusion granulation, does not require water or heat. The process involves several steps that transform loose powder into uniform, solid pellets.
Material Feeding and Initial Processing
The granulation process starts when the raw materials are put into the top hopper of the granulator. The powdered materials, which must have a moisture content of less than 10-20%, move towards the two roller shafts because of gravity. Before reaching the compression zone, the materials undergo pre-treatment processes such as degassing and spiral preloading to prepare them for optimal compression.
Compression and Extrusion Process
The most important part of the machine’s design is the way it compresses material between two rollers that rotate in opposite directions. When the motor drives the belt pulley through a speed reducer, both the driving shaft and passive shaft operate at the same speed. As the materials pass between the two rotating roller shafts, they are squished and become hard flakes or sheets.
The extrusion process serves multiple critical functions:
- Squeezes air between particles out
- Brings particles close enough to generate attractive forces like van der Waals forces, adsorption forces, and crystal bridges
- Creates molecular attraction that binds particles together without chemical additives
Sheet Formation and Breaking
After it is compressed, the material becomes dense sheets or “cakes” that come out of the roller gap. The roller surfaces often have grooves or specific patterns that help shape the material during compression and determine the final granule shape. These sheets then move to a crushing chamber. There, they are broken down into individual granules by stirring shafts or crushing devices.
Granule Formation and Screening
The last step is to break the flake material into particles that are all the same size. A pair of stirring shafts breaks down the pressed fertilizer cake into individual granular particles. The system includes screening equipment that only allows granules that are the right size to pass through. Any granules that are too big or too small are sent back for reprocessing.
Double Roller Granulator Price
The cost of our Double Roller Granulators varies based on capacity and customization:
| Capacity (t/h) | Cost Range | Example Costs |
|---|---|---|
| 0.8 – 1.5 | $10,000 – $20,000 | $10,000 for a 1 t/h model |
| 2 – 3.5 | $20,000 – $30,000 | $25,000 for a 2 t/h model |
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Ready to elevate your fertilizer production? Contact us today to discuss your custom solution.