Can roller press granulation improve the strength uniformity of biofertilizer pellets?

Producing high-quality biofertilizer is more than just mixing raw materials — granule strength, shape, and uniformity all influence application efficiency, transportation, and storage. Among many granulation technologies, the roller compactor granulator stands out for its ability to produce strong, uniform granules without the need for drying or binder additives.

The Importance of Granule Strength and Size Uniformity

• Mechanical strength ensures that granules don’t break during packaging, shipping, or application.
• Uniform size promotes consistent nutrient release and precise field application using modern machinery.
• Poor-quality granules lead to product loss, dust issues, and uneven crop nutrition.

How Roller Compaction Works

• Uses dry granulation: powder materials are compressed between two counter-rotating rollers.
• The resulting flakes are then crushed and screened into uniform granules.
• No need for high moisture or thermal drying — ideal for heat-sensitive and organic materials. This can save you the cost of biofertilizer production to a great extent!

Why Roller Compactor Granules Are Superior

• ✅Higher bulk density – Granules are tightly compacted, improving nutrient concentration per unit.
  ✅ Strong mechanical strength – Compression ensures durability in handling and application.
  ✅ Adjustable particle size – Screening systems allow you to control final granule range (typically 2–5mm).
  ✅ Low dust content – Reduced fines make it safer and cleaner to store and apply.

Materials That Benefit Most

• Fermented organic matter (compost, digestate)
• Livestock manure powder
• Agricultural waste powder (straw, husk, etc.)
• Microbial inoculants or biochar blends

These materials often have poor binding properties, making roller compaction ideal compared to wet granulation methods. If you are not sure whether the raw materials are suitable, you can consult Fude Machinery.

Technical features of roller presses

High efficiency and reliability: Roller pelletizing is an efficient and reliable pellet preparation technology with high production efficiency, low cost and large-scale automated production.

High pellet quality:

Controllable shape and size: The shape and size of pellets can be controlled during the rolling granulation process to meet the needs of different applications.

Strong density and bonding: Due to the high speed rotation and continuous extrusion of the rollers, the pellets from roller pelletizing have higher density, stronger bonding and more uniform particle size distribution, thus improving the quality and stability of the product.

Environmental protection and economy: this technology can process different raw materials into granules without adding any chemical substances (in some cases, adding appropriate amount of wetting agent can improve the granulation conditions), avoiding possible chemical reactions and toxicity problems, product purity is guaranteed, and reduce the production cost.

Wide range of application: it can be widely used in chemical, pharmaceutical, food, building materials, mining and metallurgy, environmental protection, printing and dyeing, ceramics, rubber, plastic and other fields.

Advantages of roller press granulation

• Energy saving and consumption reduction: roller press granulation makes the material granulate at room temperature, compared with other methods, it does not need drying measures such as fuel and gas, thus significantly reducing energy consumption.
• No binder: the technology utilizes the intermolecular force of the material itself for granulation, without the need to add another binder, which simplifies the process and reduces the cost, and at the same time avoids the chemical reaction and toxicity problems that may be brought about by the addition of binder.
• Lower investment: Due to the elimination of the drying process, the investment of roller press granulation is lower. At the same time, the return ratio is low and the process is simple, which further reduces the investment cost.
• Flexible composition of raw materials: the raw material route of roller press granulation is extensive, which can be adapted to the granulation needs of a variety of materials. In addition, the technology can flexibly realize the replacement of product formula in a very short time, and a set of equipment can produce a variety of formulated products.
• High granule quality: the granules granulated by roller press have high density, strong bonding force and uniform particle size distribution, thus improving the quality and stability of the products. The strength of the granules can be controlled by adjusting the pressure of the pressure rollers to meet the needs of different applications.
• Environmentally friendly production: There is no emission of three wastes during the granulation process of roller press, only consuming electricity, which meets the requirements of environmental protection. At the same time, this technology reduces dust pollution and improves the operating environment for workers.
• High degree of automation: roller press granulation equipment has a compact structure, easy maintenance, simple operation, and the charging and feeding device adopts variable frequency stepless adjustment control, with a high degree of automation, which can realize the control of one person and multiple machines and reduce the labor intensity.

For manufacturers seeking consistent granule quality without high energy consumption, roller press pelletizer offer a balanced, cost-effective solution. High granule strength and uniformity help meet both agronomic needs and commercial packaging standards — giving your product a professional edge in the competitive biofertilizer market.