Coffee roaster warm cotton-Starbucks Italian roasted coffee beans

Coffee roaster warm cotton-Starbucks Italian roasted coffee beans

Coffee roasting technology is a handicraft work, there are too many variables here, the raw beans of coffee are different, the taste is different, the temperature is different, the time is different, what we play is a baking curve in the final analysis, this is also the unique stunt of each boutique coffee shop and roaster, and how the ingredients of each Niu X hot pot shop are formulated is the same reason. Nowadays, most commercial machines can record and execute curves by computer. After the baker has pulled out a satisfactory curve, other operators can easily pour it in later, even if the Roast master is hit by a car.

1. Direct fire type

The earliest baking tools used by human beings are all direct fire, that is, the drum is heated by fire, and then heat transfer to the raw beans in the cylinder. Although, the motor keeps turning the drum and stirring the coffee beans in the cylinder, in an attempt to let each coffee bean touch the hot iron wall evenly, so as to achieve the goal of balanced baking. However, this baking method still has many disadvantages: the heat conduction speed of iron is not fast, so it must take more time to complete baking; on the outside of the burning drum, the hot gas dissipates in the air, which is a pity that it cannot be well utilized; when the raw bean touches the inner wall of the drum for too long, it is easy to be scorched, resulting in bitterness and scorching 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 become chaotic.

2. Semi-hot air direct fire type

Between 1870 and 1920, the German Fan Guban improved and manufactured the barrel roaster. In his baking theory, he refers to coffee beans that bring hot air into roasting. In 1907, the German-made Perfekt roaster began to introduce this concept, using gas heating, there is an air pump, half of the hot gas into the drum, half to the outer barbecue drum. Up to now, roller baking in Germany is still widely used, and the country's Probat drum roaster is famous all over the world.

The general roaster uses gas or electricity as the heat source. In 1987, Derek Company of Idaho took the lead in using the infrared heat source activated by gas, which made the temperature control more accurate and well received, and became the first brand in North America.

Today's drum roasters are almost all semi-hot air direct fire type, on the one hand directly heat the drum with the fire source, on the other hand bring the hot air into the drum. The hot air blown into the drum can increase the heating speed and blow away the debris, thus producing balanced and clean coffee beans.