How to use ring die pellet machine to make biomass pellets


Ring die pellet machines are a popular choice for producing biomass pellets, which are used as a renewable energy source. Biomass pellets are made from organic materials such as wood chips, sawdust, agricultural residues, and other biomass. The ring die pellet machine is known for its high efficiency, durability, and ability to produce high-quality pellets. This comprehensive guide will take you through the steps required to use a ring die pellet machine to make biomass pellets, ensuring optimal performance and output.

Vertical Small Ring Die Pellet Machine
Vertical Small Ring Die Pellet Machine

Understanding the Basics

What is a Ring Die Pellet Machine?

A ring die pellet machine consists of a circular die (ring die) with multiple holes, through which the raw material is forced by rollers to form pellets. The machine’s robust construction and continuous operation capability make it suitable for large-scale pellet production.

Benefits of Biomass Pellets

Biomass pellets offer several advantages, including being a renewable energy source, reducing greenhouse gas emissions, and providing a high energy density. They are used in residential heating, industrial boilers, and power generation, making them a versatile and eco-friendly alternative to fossil fuels.

Preparing the Raw Materials

Selecting the Biomass Material

Choose appropriate biomass materials such as wood chips, sawdust, straw, rice husk, or agricultural residues. The moisture content of the raw material should be between 10-15% for optimal pelletizing.

Pre-processing the Biomass Material

Pre-processing steps include drying, grinding, and mixing the biomass material. Use a dryer to reduce the moisture content if it exceeds the desired range. A hammer mill or a grinder is used to reduce the size of the biomass material to a fine powder, ensuring uniformity.

Operating the Ring Die Pellet Machine

Feeding the Material

Feed the pre-processed biomass material into the ring die pellet machine’s feeding hopper. Ensure a consistent and controlled feed rate to maintain the quality and efficiency of pellet production.

Adjusting the Machine Settings

Adjust the ring die and roller gap according to the manufacturer’s instructions. This gap affects the density and quality of the pellets. Proper adjustment ensures smooth operation and reduces wear and tear on the machine components.

Pelletizing Process

As the biomass material enters the ring die, it is compressed by the rollers and forced through the die holes to form pellets. The high pressure and friction generated during this process cause the temperature to rise, which helps bind the particles together. Continue the process until the desired pellet size and density are achieved. Click here to get more information.

Monitoring and Controlling the Process

Regularly monitor the machine’s operation, including the temperature, pressure, and feed rate. Make necessary adjustments to maintain consistent pellet quality. Ensure that the machine is not overheating, as excessive heat can damage the biomass material and reduce pellet quality.

Post-Production Steps

Cooling the Pellets

Once the pellets are formed, they need to be cooled to reduce their temperature and harden. Use a pellet cooler to bring the pellets down to ambient temperature. Proper cooling ensures the structural integrity and durability of the pellets.

Screening and Sorting

After cooling, screen the pellets to remove any fines or broken pellets. Use a vibrating screen or a rotary sieve to separate the pellets based on size. Recycle the fines and broken pellets back into the raw material mix for the next batch.

Packaging and Storage

Pack the pellets using automated packaging machines into bags or bulk containers. Ensure that the packaging is airtight and moisture-proof to preserve the quality of the pellets. Store the packaged pellets in a dry, cool place away from direct sunlight and moisture to prevent degradation.

Maintenance and Troubleshooting

Regular Maintenance

Regular maintenance of the ring die pellet machine ensures its longevity and optimal performance. This includes cleaning the machine, lubricating moving parts, checking and replacing worn-out components, and ensuring that the electrical systems are functioning correctly.

Common Issues and Solutions

– **Pellets are too soft or crumbly**: This could be due to low pressure or insufficient moisture content. Adjust the roller gap and ensure the material’s moisture content is within the desired range.
– **Machine overheating**: Check for proper lubrication and ensure that the cooling system is functioning effectively. Reduce the feed rate if necessary.
– **Blockages in the die**: Regularly clean the die and ensure that the raw material is free from contaminants that could cause blockages.


Using a ring die pellet machine to produce biomass pellets involves several steps, from selecting and preparing the raw materials to pelletizing, cooling, screening, and packaging. By following this guide, you can ensure high-quality pellet production with optimal efficiency. Regular maintenance and monitoring are crucial to maintaining the machine’s performance and extending its lifespan. Biomass pellets are a sustainable and eco-friendly energy source, and mastering the use of a ring die pellet machine can contribute significantly to renewable energy efforts. With attention to detail and adherence to best practices, you can achieve consistent, high-quality biomass pellets that meet the energy needs of various applications. Visisting: