The way coffee is roasted

Because of the characteristics of these two, bakers naturally split into two major schools: support (direct heat type) direct heating "steady school", and support (hot air type) hot air heating "light school".

1. Direct heating "stable school": The principle of direct heating is to bake metal pots or barrels with fire.

Use conduction and radiation to roast or fry the coffee beans contained in it. Usually when baked in this way, the water in the beans is less likely to dissipate, so it takes a longer time, usually 12 to 25 minutes per batch. Direct heating of the "stable pie" special emphasis on the fine control of the temperature of each stage, in the premise of sufficient caramelization reaction, as far as possible to reduce the temperature to preserve the water in the coffee beans, to avoid roasting too fast and make a large amount of water evaporation, destroyed the structure and flavor of coffee beans. For coffee of the same roasting degree, the beans that have been roasted for a long time are inherently less acidic, thicker and more complex. In addition, the direct heating method will make the peeled beans burn in the coffee beans, making the coffee smell carbon, forming a stable roaster fascinated by the mouth.

2, hot air heating "light pie": as for the hot air machine structure is similar to the hair dryer,

Blow coffee beans into the air with a blast of hot air, and let the beans tumble in the hot air and be evenly roasted. Because the hot air heating method uses a higher temperature, the moisture of the coffee beans is easy to be dried by hot air, so this method takes a shorter roasting time, about 5 to 15 minutes. The "light" believes that the "slow" baking speed will cause too much aroma loss, while the beans baked for a short time will preserve more acidity and flavor. Because the effect of hot air heating is very uniform, the bean skin will also be blown away with the hot air, and the carbon flavor will not be mixed into the coffee, making the flavor very clean and the characteristics very clear, which is in line with the aesthetic concept of "light school".