The features of the semi-hot air coffee roaster are mainly reflected in the following aspects:
The firepower is stable and less affected by the external environment: The firepower of the semi-hot air baking machine is relatively stable and is less affected by the external environment (such as indoor temperature, air circulation, etc.). Only the back of the drum has holes to allow hot air to enter, while the other parts are sealed. This design makes the heat supply more stable and helps the coffee beans expand evenly when heated.
Uniform roasting and stable flavor: The semi-hot air roaster combines the features of direct fire and hot air types. It not only has a certain flame heating but also hot air circulation, which can ensure that coffee beans are evenly heated during the roasting process. This roasting method helps to keep the flavor and aroma of coffee beans relatively stable and is suitable for roasting single-blend beans or mixed blends.
Easy to operate and control: The semi-hot air roaster is one of the most popular and easiest coffee roasting methods at present. Users only need to adjust the heat to control the required heat for each baking stage, and the operation is relatively simple.
Roasting suitable for blended coffee: Semi-hot air roasters perform exceptionally well when roasting blended coffee. Because the heat energy it conveys is more evenly distributed, even if the density of the green beans is inconsistent, the heat source provided by the roaster can be fully absorbed by the green beans, thus ensuring that the roasted coffee beans remain consistent in flavor and aroma.
The preheating time is relatively long, so attention should be paid to the heat setting: Compared with direct-fire roasters, semi-hot air roasters require a longer preheating time. If the preheating is insufficient, the tissue of the beans may not expand evenly during roasting, resulting in inconsistent coffee bean color and affecting the stability of flavor and aroma. In addition, the initial firepower setting is also very important. It is necessary to avoid the firepower being too intense compared to the amount of green beans, so as not to cause the first burst time to be too early.