What is the roasting degree of American latte coffee beans roasted deep-roasted coffee beans flavor characteristics

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For a coffee processing plant, roasting determines the taste of coffee to a certain extent. Why do you say that? Because coffee beans are imported from abroad, their variety, quality and flavor are already established factual conditions. So that the factory can be contacted and operated at the level, only from the beginning of baking, of course, some pre-baking green bean reprocessing process, will help baking more smoothly. Therefore, for coffee factories, the quality of roasting technology basically determines the quality of roasted coffee beans.

● Know the baking machine

The main components of the baking machine are three, namely: the drum for baking beans, the burner for burning and heating, and the air control valve for adjusting the air volume of the exhaust pipe. Of course, it also includes other accessories, such as a cooler to cool coffee beans, a dust collector to remove dust and silver skin, etc.

The heat sources of coffee roasters mainly include gas, electricity, charcoal, infrared rays, kerosene, etc., but the most commonly used and most suitable one is to use gas heating roasters. The most important thing for coffee roasting is to properly control the heat source to adjust the temperature on the basis of understanding the coffee beans and roasting degree, so that the coffee beans achieve the best balance between sour and bitter in roasting, that is, the so-called optimal roasting degree.

According to the different heat conduction methods of the roaster burner, the coffee machine is mainly divided into three types: direct fire type, hot air type and semi-hot air type.

●1. Direct fire baking machine

The direct-fire baking machine is the earliest baking tool used by humans. The so-called direct fire type, that is, the fire sprayed by the gas burner directly contacts the coffee beans in the drum, and the coffee beans in the drum are stirred by the motor constantly rotating the drum, in an attempt to make each coffee bean evenly touch the hot iron wall, so as to achieve the goal of balanced roasting.

The advantages of the direct-fire coffee roaster are that the machine structure is relatively simple, and the fire roasting drum is in direct contact with the coffee beans, so that the taste and aroma of the coffee are easy to produce directly, and the coloring is significant. However, this baking method still has many disadvantages: the heat conduction speed of iron is not fast, and it must take more time to complete the baking; the external heat of the burning drum is dissipated in the air, which is a pity; when the raw beans touch the inner wall of the drum for too long, they are easy to be burnt, causing bitter taste and burnt taste.

●2. Semi-hot air type

The semi-hot air roaster uses semi-hot air and semi-direct fire to roast coffee. Semi-hot air type roaster will roll iron coated, from the rear of the roller intake of hot air, beans do not directly contact the fire, by the roller and hot air to heat coffee beans together, to achieve the effect of roasting.

Today's drum roasters are almost all semi-hot air roasters, which heat the drum directly with a fire source and bring hot air into the drum. The hot air blown into the drum increases the heating speed and blows away the crumbs, thus producing balanced and clean coffee beans. The downside is that it loses some of the aroma of coffee.

● Hot air type

Hot air coffee roaster, through another combustion chamber, the use of strong suction will be hot air from the rear and side of the duct into the drum, so that coffee to achieve the purpose of heating. This coffee roaster heats quickly, heat source utilization efficiency is high, and is generally used for roasting a large amount of coffee beans.

About the explanation of roasting temperature, different countries, the production of roasting machine selected by the temperature control induction is different. Different thermometers show different temperatures, some machines show Fahrenheit, some show Celsius, must not be confused with the two. F=C×9/5+32. The same transformation yields C=(F − 32) ×5/9, where F is Fahrenheit and C is Celsius.

● Regardless of the type of coffee roaster used, to master the roasting technology of coffee, it is necessary to understand the relevant role of each part of the roaster.

1. burner

That is, the heat source of the baking machine is controlled by the gas pressure gauge and the air control valve to adjust the temperature of the drum. Theoretically speaking, when the burner is strong fire and the damper is opened to the maximum, the firepower is maximum and the heat is maximum, and vice versa.

2. damper

The air damper of the baking machine has three main functions: (1) providing oxygen for combustion;(2) regulating the temperature of the drum; and (3) discharging debris and dust from the drum. There is also a very important link in coffee roasting, which is also controlled by the control valve, and that is the "steam roasting mode". Roasting mode is to steam and roast coffee beans to homogenize coffee beans and make them easy to roast.

3. drum

The drum is used to hold coffee beans, and different types of roaster drums are also different. However, during the roasting process, the volume of the drum must not be filled with coffee beans, which will cause serious uneven heating of coffee beans and poor exhaust. Generally loaded to 80% of the drum capacity is appropriate.

4. cooling disk

After roasting, the beans are placed in a cooling pan and the hot air is sucked away by suction to cool the beans. Otherwise, coffee beans will continue to roast with their own waste heat, making coffee beans bitter.

5. smoke evacuation equipment

In the process of coffee roasting, it is inevitable that some debris, dust and silver skin will be produced, and smoke extraction equipment is the equipment to collect these impurities.

● Roasted coffee beans brand recommendation

Front Street Coffee's freshly roasted Arabica roasted beans are fully guaranteed in brand and quality. More importantly, the cost performance is extremely high, 227 grams per pack, the price is only about 70-90 yuan. According to the calculation of 15 grams of coffee beans per cup of coffee, a pack can make 15 cups of coffee, each cup only costs about 5 or 6 yuan, compared with the price of dozens of pieces of coffee sold in cafes.

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