What brand of household coffee roaster is good _ what coffee bean roaster works well?

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The roaster is mainly divided into "direct fire type" and "hot air type", as well as the deformation of both "semi-hot air type". Heat sources are gas, electricity, charcoal and other sources, with the use and purpose, you can choose your own roaster.

Today, we mainly introduce direct fire type and semi-hot air type.

Direct-fired roaster

The direct-fire roaster puts the raw beans into a perforated drum and then contacts the beans directly with the fire of the gas burner.

The taste and aroma of direct-fired roasted coffee are easy to produce directly. The machine is not easy to break down because of its simple structure.

Beans come into direct contact with the flame, the surface is easy to color, but sometimes the heat can not reach the center of the beans. Beans are easy to scorch, and deep baking will produce a foul smell. The beans are slightly less swollen, making it difficult to bake coffee with a balanced taste.

Semi-hot air roaster

The semi-hot air roaster is the drum wrapped in iron plate, and the hot air is sent to the rear of the drum, so that the beans do not come into direct contact with the fire.

Semi-hot air baked beans do not come into direct contact with fire, so it is not easy to produce fragrant aroma. The taste is fresh, bright and uniform. Baking is easy to control, making moisture-rich new beans easy to bake. Beans are in good state of expansion.

Each type of machine has its own advantages, so it is impossible to generalize which is better. As long as the overall balance between the air intake of the baking room and the exhaust volume of the chimney is sought, the roasted coffee will not make much difference in taste.

At first glance, it seems that the operation of a complex roaster is actually quite simple, and anyone can learn how to use it at once.

First turn on the switch.

Ignite gas

Put the raw beans into the drum in the boiler

While adjusting firepower and exhaust, constantly pull out the sampling spoon to confirm the baking degree.

After judging that the beans have been baked, turn on the cooler switch and remove the beans from the boiler.

That's what the baking process is about.

Well, the eyes are good, but what about the hands? All right, then let's familiarize ourselves with the roasting machine and understand the roasting of coffee.

Construction of roaster

The structure of the roaster is mainly divided into the "heating part" and the "exhaust part" to remove smoke and impurities. Drum and gas burner belong to the former, exhaust pipe and gas valve belong to the latter.

Gas-making valve

There are three main functions of the air valve:

The exhaust function of waste such as smoke and debris.

Provide the amount of oxygen necessary for beans to burn

Adjust the heat in the drum

Basically, the air valve mainly has the function that the temperature of the drum rises when it is opened, and the temperature of the drum decreases when it is closed. Immediately after putting the raw beans into the steam baking mode (closing the air valve) to homogenize the beans, which is also one of the important functions of the gas valve.

drum

Direct fire and semi-hot air drum structure is very different, but the basic conditions are to have a uniform baking beans stirring fan blade and the right speed.

However, if you put as many raw beans as the capacity of the roaster, it will cause uneven baking and exhaust difficulties. It is mostly caused by the structure of stirring fan blades. The roaster pushes the beans to the front of the drum according to the centrifugal force generated when rotating, so that the beans are fixed in a lump.

smoke evacuation equipment

Roasting green beans produce a fair amount of dust, crumbs, and silver skin, and dust collectors are machines that collect these things. It is connected to the baking machine by a horizontal duct and then connected to the chimney outside the house.

cooling device

If the beans are not cooled immediately after roasting, they will continue to roast with their own waste heat, which will make the bitterness stronger.

▲ Cooling tank

firepower device

Controlling the temperature of the roaster is based on multiple adjustments of both burner power and damper. Fire setting depends on the gas pressure gauge, fine adjustment depends on the damper. Theoretically, when the burner is strong fire and the brake valve is fully open, it is the maximum heat, otherwise, it is the minimum heat.

Understand the structure of the baking machine, do you understand the difference between the direct fire type and the semi-hot air baking machine?

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