newly finished compactors in workshop

Why compacting

Compacting and granulation processes are technologies of particle size enlargement using a dry process in which dusts or powders are formed into shapes. The densification of the product is obtained by mechanical compression through a double roll press.

Moreover, agglomeration involves a chemical process, in which two counter-rotating rolls press granular material into larger pieces. Reduction in surface area of agglomerated material leads to better product, and thus, explains why coarser feed is most desirable. In other words, large particles retain less surface area, resulting in less work per unit volume.

The compactor uses a higher compaction pressure than briquetting and specialized product shape to produce a suitable compacted material. This allows materials to be compacted into a specialized solid form product shape – such as stick-shaped agglomerates, or flat or corrugated sheets – and then granulated to a more useable size.

working priciple of compacting and granulating


  • Animal feed, fertilizers or other micronutrients to create the desired mixture and for proper distribution on the soil.
  • Chemicals, salt, minerals and organic materials to coarse or fine granules.
  • Improve flow characteristics of fine materials.


two types of roll pocket for compactingrolls
sodium formate flakesodium formate
zink sulfate flakezink sulfate
dolomite flake from roller compactordolomite

Compacting & Granulating

NPK fertilizer from granulationNPK fertilizer
granulated potassium chloridepotassium chloride
compound fertilizercompound fertilizer
ammonium sulphate by granulatingammonium sulphate

The Process

Typical compaction and granulation plants include special auxiliary equipment used for milling, screening, mixing, de-aeration and material handling. This equipment needs to be properly selected and designed to ensure proper operating conditions and quality products.

a typical process of compacting and granulating
A normal compacting and granulating process just as follow:

  1. Materials are fed and mixed from the material silo into the compactor. Feed materials are then pressed together into compacts by roll compactors.
  2. The produced compacts are broken into granules and classified into desired particle size. Undersize materials are fed back into the roll compactor while oversize materials are fed back for further size reduction.
  3. Materials of the final desired size and shape are ready for any further finishing, such as drying or anti-caking agent application, and prepped for final packaging.


  • Simplified manufacturing process

By dry-process granulation, you require no humidification and drying stages.

  • Minimal transformation

This system is the best-suited to granulate materials which are unstable to water or solvent and subject to thermal transformation.

  • High-density products

By compaction with pressure rollers, you can produce high-density particles and granulated powder.

  • High compression force

The Kurimoto High-pressure Type Roll Compactor offers larger compression force, enabling you to produce high-density and high-intensity products.

  • Soft granulation

Even though the hydraulic cylinder is used to apply compression force, since the operative pressure of the hydraulic cylinder can be easily adjusted, you are able to reduce the compression force for soft granulation.

  • Incorporation of high-performance screw

The screw performance exerts a significant influence upon the granulating capability of the Roll Compactor.

The Roll Compactor has a high-performance screw, which have materials intruded between the rolls to facilitate de-gassing.

  • Efficient crushing and granulation

By freely varying combination of breakers, several types of granulators for fine particle and sizing use, and granulators with screen, you can efficiently get a target particle size.

dry granulating equipment system for formula fertilizer NPK

Maxton provides assistance with the complete design of compaction and granulation plants to operate under various conditions and ensure all equipment is well-suited to your specifications.

Parameter for roll compactor

Roll diameter (mm)450650
Roll width (mm)250320
Roll speed (rpm)1816
Max. compacting thickness (mm)2530
Flake capacity (t/h)912
Main power (kW)75110
Screw feeding speed (rpm)3235.6
Screw feeding power (kW)15 VFD15 VFD
Diemension (mm)2800*2800*29004100*3700*3600
Weight (T)12.820

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