Direct Fire Roasting.
Direct Fire Roasting The drum surface of the direct fire roaster machine has a perforated design, the holes are of a certain size and spacing, and the fire underneath is directly transmitted to the furnace chamber.
It has a high technical requirement for the roaster and is very careful about the fire adjustment of each roasting stage.
Advantages of the direct-fired roasting machine
Shorter preheating time: Compared with hot air and semi-hot air roasters, the direct fire roaster has a thinner wall, so the overall warm-up time is shorter.
The flavor of the manor bean can be uniquely characterized: the process of direct fire roasting is directly transmitted to the green beans through the fire, that is, the heating method in which the heat energy is gradually organized into the inner tissue by the outer tissue of the green bean. Therefore, direct fire roasting is like cooking dumplings. It is necessary to add few waters. The purpose is to make the inside and outside of the dumplings evenly heated. Otherwise, the surface is cooked and the inner is not cooked. The same is true for direct fire roasting. It can be combined with the characteristics of green beans, adjust the fire and the damper, and choose whether to be low-temperature roasting or high-temperature roasting according to the condition of green beans. Low temperature roasting is suitable for more green bean input, while high temperature roasting is suitable for less input.
Suitable for mixed beans or single bean coffee: Direct fire roasting can express the flavor and aroma of coffee, and the effect is better than hot air or semi-hot air roasting.
(taken from : https://shopcoffeeroasters.com/what-is-the-advantage-of-a-direct-fire-coffee-roaster/ )
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