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Continuous dryer/roaster


The RoaStar is designed for gentle, high-quality roasting of cocoa beans, hazelnuts, peanuts, almonds and other types of nuts and seeds. The vertical duct system and cutting-edge convection give you full control over flavor, color and aroma.

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Key benefits

Configured for your product and capacity needs

The innovative RoaStar’s modular system allows you to meet different capacity requirements for a wide range of raw materials. Its vertical design gives it a small footprint that you can easily accommodate on your factory floor.

Cutting-edge process

The RoaStar’s advanced low-temperature vapor-heating process ensures significant energy savings, while heat exchangers recover precious exhaust energy for reuse in the roaster to keep energy costs low.

Precise control

The RoaStar precisely controls and monitors temperature and timing so that raw materials are roasted gently and to exactly the right degree. This allows you to develop the very best flavor, color and aroma for superior quality, every batch.

Highlight features

Vertical product duct system

Advanced roasting process

Extremely gentle treatment of raw materials is key when developing the highest quality product. The vertical product duct system used in the RoaStar allows your materials to move under the influence of their own weight alone. This prevents fat leaking from kernels to shells and guards avoiding damage to the surface of nuts during the roasting process.

Environmentally friendly

Innovation for ultimate energy efficiency

Much of the exhaust energy that would otherwise be lost in the roasting process is recovered by heat exchangers for reuse. Steam heating both ensures that exhaust air is free from sulphur and nitrogen oxides and allows the RoaStar to use biomass combustion. Fueling the system using byproducts such as cocoa shells rather than fossil fuel gives you a supremely efficient CO2-neutral operation.

Advanced automation

Easy to operate

The advanced automatic control system monitors every part of the roasting process to ensure it operates without a hitch. Intuitive displays present vital information in a clear and user-friendly way, allowing your operators to respond with adjustments quickly and easily. With the integrated fire detection system constantly checking each parameter, safety is a priority.

With increasing demand for the specific flavor characteristics of cocoa beans from diverse origins, a precisely controlled roasting process is essential. Separate zones allow you to set different roasting degrees for each product. Timing can be set from 13 to 20 minutes per zone; combining these with various temperature profiles offers you almost infinite possibilities for flavor development.

Using our global experience across food processing and manufacturing, we can customize your solution to meet your precise requirements. Our experienced engineers can help you plan, implement and support new technology to improve quality, efficiency and safety for your plant.

Key topics

Billions of people come into contact with Bühler technologies to cover their basic needs for food and mobility every day. Our motto is creating “innovations for a better world.” Find out more about our key topics.

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