Coffee bean roaster what is direct-fire coffee bean roaster advantages and disadvantages of direct-fire roaster

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Direct-fired coffee bean roaster

Direct Fire Roaster, literally, is to heat coffee beans directly with a flame. The biggest feature is that the drum has a small hole, and the fire can burn directly to the bean watch. Although the coffee beans can be heated evenly by stirring the drum, the heat is difficult to control, so it is easy to scorch the surface of the beans, while the stamens are not fully ripe when the beans are cut open. The direct fire type adjusts the heat through the exhaust valve, and its operation is also cumbersome, so the reproducibility of the baking result is poor. In addition to the general flame (including gas furnace fire and charcoal fire), the "fire" of direct fire now includes infrared and electric heating pipes.

Advantages: the baking time is long, so that the caramelization reaction can be fully carried out and the taste spectrum is rich. If skilled by adjusting the exhaust valve can also accurately control the taste, make a prominent personality of the coffee.

Disadvantages: it is easy to cause uneven baking and even scorch coffee beans if the heat is not well controlled, forming a scorched and bitter taste. When baking, there are a lot of crumbs burst out, left in the tube is easy to adhere to the surface of coffee beans, will make the flavor chaos. In addition, the heat conduction rate of iron is not fast, so it must take more time to complete baking. The hot air formed when heating the drum is also unused, resulting in high energy consumption, so it is less used in large-scale production.