Principle of coffee roaster concentration and roasting coffee beans graphic degree

Principle of coffee roaster concentration and roasting coffee beans graphic degree

Espresso machine (Espresso Machine): coffee drinks are extremely unstable liquids that can change their characteristics and taste at once. This is the main reason why the espresso machine (Espresso Machine) was invented. The espresso machine can continuously extract several cups of coffee, and the high pressure in the brewing process can emulsify and melt the oil and gum in the coffee beans, and the essence of the coffee beans can be completely extracted by pressure, making the brewed coffee more concentrated and more mellow in taste and flavor.

Degree of difficulty: ★

Playability index: ★

Flavor acquisition: ★

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Equipment required: Italian coffee machine, Italian bean grinder and a series of supporting equipment

The baking method, which combines the advantages of direct fire and hot air, is the mainstream of commercial baking machines at present. Semi-direct-fire baking is actually similar to direct-fire baking, but because there are no holes in the outer wall of the baking container, the flame will not directly touch the coffee beans. In addition, a ventilation device is added to introduce the hot air from the outside of the baking container into the baking room to improve baking efficiency. Another function of this ventilation device is to suck out the exfoliated silver skin (the film attached to the outer layer of coffee seeds). Prevent the silver skin from burning because of high temperature in the baking room, thus affecting the taste of coffee beans. Some of the so-called charcoal-roasted coffee is to help prevent the discharge of silver skin and make the coffee beans smell of smoke.

Semi-direct fire semi-hot air machine has the advantages and disadvantages of both direct fire type and hot air type, but its heating mode is changed according to the adjustment of hot air and boiler speed. The larger the hot air, the faster the speed is, the closer it is to the hot air type; on the contrary, the closer it is to the direct fire type.

As the name implies, the direct fire is to heat the coffee beans directly with a flame. Up to now, the "fire" of direct fire not only includes general flame (including gas furnace fire and charcoal fire), but also includes infrared and electric heating pipe.

Advantages: the baking time is long, so the caramelization reaction is sufficient and the flavor is rich.

Disadvantages: it is easy to cause uneven baking, and if the heat is not well controlled, it is easy to scorch coffee beans and form a bitter taste.