Controlling cocoa flavour across multiple roasting zones
If you’re running continuous cocoa roasting, you know flavour isn’t defined at one point in the process. It develops step by step—and small deviations along the way quickly show up in the final profile.
In vertical shaft roasters, this is addressed by dividing the process into multiple controlled zones, each contributing to a specific phase of flavour development.
Stepwise flavour development in multi-zone roasting
Systems such as the continuous shaft roaster from PROBAT use vertically stacked roasting zones with independent temperature control. Cocoa beans move downward through these zones while hot air flows across the product, allowing heat to be applied progressively rather than all at once.
The process typically starts with a drying phase at lower temperatures (around 100°C), followed by a controlled increase in heat to drive the Maillard reactions responsible for cocoa flavour development. By separating these stages physically, operators can adjust each phase independently, rather than relying on a single temperature profile.
Managing moisture and roast termination
In addition to temperature, moisture plays a key role in flavour formation. Systems can be equipped with humidity monitoring and control to manage drying rates and extend the reaction time where needed, supporting more complex flavour profiles.
An optional cooling zone allows the roasting process to be stopped at a defined point, preventing over-roasting and helping to stabilise the desired flavour profile. Combined with continuous product flow and consistent heat distribution, this enables producers to maintain repeatable roasting results across different bean types and capacities.
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