Types of roasting machines

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Roasting machines can be broadly categorized into three main types: direct flame, semi-hot air, and hot air. Each of these methods yields distinct flavors, and the final product's taste can largely depend on the expertise of the roaster.

Direct Flame Roasting Machine

This type of roasting machine directly applies heat to the raw beans. The rotating drum, which contains the beans, is constructed from perforated metal, allowing hot air to flow in while the drum also provides conductive heat.

The direct flame roasting machine's hallmark is its ability to roast beans by applying fire or heated air directly through the perforated metal surface. The heat source can reach temperatures up to 200 degrees Celsius, resulting in a robust and unique aroma and flavor profile.

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Semi-Hot Air Roasting Machine

While similar in heat source distance to the direct flame types, the semi-hot air roasting machine typically features a drum made from iron plates. This creates a clean and slightly tart finish often sought after in premium coffee.

This machine excels in conducting heat from the drum, allowing for a wider range of roasting options as one can modify the conduction temperature. The semi-hot air roasting machine is appealing because it helps roasters achieve their preferred flavor profile.

Hot Air Roasting Machine

In contrast, the hot air roasting machine introduces heated air into the drum from a separate heat source. Compared to the direct flame and semi-hot air variants, the influence of conduction heat is minimal, so the final flavor is adjustable based on both temperature and airflow.

This system is user-friendly and provides a consistent outcome, making it a popular choice among large-scale roasters. Furthermore, the extensive adjustability in hot air application time enhances the roasting flexibility, making it ideal for specialty coffee roasting.

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