The principle of coffee roaster the most commonly used coffee roaster

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Types of coffee and bean dryers

Coffee beans are roasted just before they are sold, because the state of raw beans is more stable than that of cooked beans, and the best taste period for roasted beans is within a month.

There are many ways to bake beans, and there are two most commonly used coffee dryers: drum / drum dryers and hot air or floating bed dryers.

Drum / drum bean dryer

This form of baking, invented around the early 20th century, is very popular with bean bakers who pursue the ultimate craftsmanship, because this kind of bean roaster can slowly bake coffee beans.

The principle is mainly to heat a metal drum on the fire source, while the coffee beans keep rolling in the drum, in order to achieve a uniform baking effect.

This kind of bean dryer can improve the firepower of heating by controlling the gas flow, and it can also control the air flow inside the drum, thus controlling the heat efficiency transmitted to the coffee beans.

Drum / drum bean dryers are available in many different sizes, and the largest model can bake 500kg coffee beans at a time.

Floating bed bean dryer

It was invented by Michael Towitz in the 1970s. The floating bed bean dryer turns and heats the coffee beans by a lot of jet hot air.

The total baking time of the floating bed roaster is much shorter than that of the drum / drum dryer, so the roasted coffee beans will swell a little more.

A larger air flow helps heat transfer to the inside of the coffee beans more quickly, so baking can be completed more quickly.

Tangential bean baking machine

It is produced by Probat. The tangent bean dryer is very similar to the drum / drum type, except that it has a shovel-like mixing blade inside the machine.

Coffee beans can be evenly mixed during heating, which makes larger baking batches more efficient.

The maximum amount of beans baked by this kind of baking machine is about the same as that of drum / drum type, but it can bake faster.

Ball centrifugal force bean dryer

The bean roaster with this structure can bake a large number of coffee beans in an incredibly short time. Put the coffee beans in a huge conical container in a spherical pot.

While heating, by constantly rolling the spherical pot, the coffee beans will continue to tumble and change position, and the baking of a batch can be completed as soon as 90 seconds.

The faster the baking speed is, the smaller the weight loss ratio is, and the weight of coffee beans that can be extracted increases, which is very important for people who make instant coffee.

But baking at such a fast rate is not usually done to produce the best quality.