Types of coffee roaster boutique coffee roaster

Baking machine is mainly divided into 4 categories, direct fire type, semi-hot air direct fire type, hot air type, electric type.

1. direct fire

Direct fire type is the earliest use of baking tools, that is, the use of fire to bake hot drum heat transfer to the barrel of raw beans. A built-in motor rotates the drum constantly, stirring the beans in the drum, trying to make each coffee bean evenly contact with the hot iron to achieve the goal of balanced roasting.

Disadvantages:

● The heat conduction speed of metal is not fast enough, and it takes more time to preheat the drum.

● Outside of the burning drum

But the heat dissipates into the air, and it is a pity that it cannot be used well.

● When raw beans touch the inner wall of the drum for too long, they are easily burnt, resulting in bitter and burnt taste.

● The silver film or silver skin produced during roasting will remain in the barrel and easily adhere to the surface of the coffee beans, making the flavor turbid.

2. semi-hot air direct fire type

c. 1870 - 1920; German Van Gulpen devoted his life to the improvement and manufacture of roaster machines, leaving many innovations to posterity, in one of his inventions; coffee beans that had been elevated to the point of being roasted by hot air.

In 1907, the Perfekt baking machine made in Germany began to introduce this concept. It used gas for heating action and had an air pump to bring half of the hot air into the drum and the other half to the outer barbecue drum.

On the other hand, Germany's Polo Probat drum baking machine can be said to spread to the baking industry in various countries.

Roasters generally use gas or electricity as heat sources, but Diedrich, Idaho, pioneered the gas-activated infrared heat source Gas-Infrared in 1987 for more precise temperature control and was praised as the number one brand in North America.

Today's drum roasters; almost all use semi-hot air direct fire type, one side to the fire directly barbecue hot drum, one side will bring hot air into the drum inside, blowing hot air into the drum, can improve the heating rate, but also blow away debris, so can produce balanced and clean coffee beans.

However, due to the different structural designs of each family, and their own is the best design, in fact, to understand the roasting principle of coffee is the most important, the same level of different brands of roasters, and will not cause too many differences.

3. hot air type

In the 20th century, some people thought of roasting coffee beans with hot air. In addition to the iron barrier, the heat source can be transmitted directly to the green beans to improve the roasting efficiency.

The Jadez Burns Thermalo, a 1934 American baking machine made by Burns, is a hot-air model, and there are still some large baking plants in the United States that still use this type of baking machine.

Fluid-BedRoaster, an air bed roaster still available on the market. Here is a brief introduction: the structure of the hot air roaster is still designed with a roller; by rolling to flip the raw beans, to achieve balanced baking. However, it has long been thought why not use hot air to blow raw beans; let beans float up and down, breaking the concept of rollers.

In 1976, American Michael. Michael Sivetz designed the Fluid-Bed Roaste, an air-bed roaster that blows air from below in an airtight container so that green beans float up and down the container until roasting is complete and then pour into a cooling tray outside the container to cool. Schwitz's comments.

Australia also has a similar design and construction of baking methods; created by Ian Bersten Australia, and marketed by the Roaster Roller Roaster is also quite famous. In the general roasting process; the moisture in the beans is evaporated less and less, and the quality becomes lighter and lighter, and the proportion of the quality of the roasting machine will fall faster, and the roasting of the hot air will be accepted again.

4. electric heating type

Electric heating is heating wire heating roller, this power is relatively large, the disadvantage is that the value of the electric heating tube for a long time unstable voltage will lead to damage, loss of heating function, equipment will also be paralyzed. Do not worry too much about almost every city's electrical wholesale market can be customized heating pipe, is the machine to restore working condition.