Extruder & Spheroniser for Pharmaceutical Pelletisation

Pelletisation is widely used in pharmaceutical manufacturing to produce uniform, spherical multi-particulates for modified release, coating and capsule-filling applications.

The Extrusion–Spheronisation process converts a wet granulated mass into controlled, spherical pellets with good flow, narrow particle-size distribution and suitable mechanical strength.

Extrusion

In the extrusion stage, the wet mass is passed through a defined screen or die to form uniform cylindrical extrudates.

The extrusion process helps control:

• Extrudate diameter
• Density
• Moisture distribution
• Uniformity
• Feed consistency

The characteristics of the wet mass and extrusion parameters directly influence the quality of the final pellets.

Spheronisation

The extrudates are transferred to the Spheroniser, where they are broken and rounded into spherical pellets through controlled rotational movement.

Spheronisation helps achieve:

• High sphericity
• Uniform pellet size
• Smooth surface
• Good flowability
• Controlled density
• Reduced fines

These characteristics are important for consistent coating and downstream processing.

Why Pellet Uniformity Matters

Uniform pellets provide a reliable base for subsequent pharmaceutical processing.

They can support:

• Consistent drug distribution
• Uniform functional coating
• Better capsule filling
• Improved flow during handling
• Controlled or modified drug release

Pellet quality depends on both formulation characteristics and process parameters.

Important Process Considerations

Successful extrusion and spheronisation depend on factors such as:

• Wet mass consistency
• Binder concentration
• Moisture level
• Extrusion screen size
• Extrusion speed
• Spheronisation speed
• Residence time
• Batch load
• Desired pellet size

Optimisation of these parameters helps achieve the required pellet size, shape and mechanical properties.

Integration with Downstream Processing

After spheronisation, pellets can be dried and further processed depending on the formulation requirement.

They may undergo:

• Drying
• Sieving
• Functional coating
• Drug layering
• Modified-release coating

This makes extrusion–spheronisation an important part of integrated pharma pellet manufacturing lines.

Anish manufactures Extruders and Spheronisers for laboratory, pilot and production-scale pharmaceutical applications.

Backed by 35+ years of experience and installations across 30+ countries, Anish supports manufacturers in developing reliable and scalable pelletisation processes.

Visit the Anish Application Lab in Nashik to conduct product trials and optimise your extrusion–spheronisation process.