Coffee machine adjusting grinding degree maintenance-Italian coffee machine grinding requirements

Coffee machine adjusting grinding degree maintenance-Italian coffee machine grinding requirements

Desiderio Pavoni obtained a design patent for Bezzera in 1903, and he has been making the coffee machine since 1905. After that, Teresio Arduino began to produce similar coffee machines, and other producers followed suit. In the 1920s, coffee shops in Italy could see signs of this kind of coffee machine. But the Italians are obviously not satisfied with the results of the steam pressure coffee machine. The pressure should be increased by steam, but increasing the heat may burn the coffee powder during cooking, losing the aromatic oil hidden in the coffee powder and making it more refined.

Take out the doubly bitter coffee. Therefore, some people think: can it be directly pressurized on the hot water instead of boiling the water with steam as the pressure?

During the two world wars, people used the natural pressure of water from the faucet to increase the pressure of brewing coffee. The coffee machine uses electricity to quickly heat a small pot of water to the boiling temperature, each pot of water to make a cup of coffee, each pot connected to the faucet. As long as the operator gently press the pole on the small pot, the pressure of the faucet will push the hot water in the small pot to the coffee powder. According to the difference of water pressure in different regions, generally speaking, the pressure generated by this coffee machine is greater than the 1.5 atmospheric pressure produced by the steam pressure coffee machine. The height of this coffee machine is not too different from that of the steam pressure coffee machine, but the overall size is smaller. In appearance, it was more in line with the popular trend of the late 1920s and 1930s, replacing the arc of the steam pressure coffee machine with straight and geometric lines.

The blade grinder is another common bean grinder, which works on the principle that a fast rotating blade will cut the coffee beans into fine particles. This kind of bean grinder is usually cheap, but the coffee powder it grinds is of average quality because the blade generates a lot of heat when rotating and cutting. In addition, the size of the coffee powder cut by the blade grinder is uneven, which will greatly affect the final quality of coffee. Usually, the blade grinds the beans to produce a small amount of ultra-fine coffee powder like sawdust, which can cause the coffee to have a negative taste of excessive extraction and bitter taste. These very fine coffee powders can also clog the outlet of the Italian espresso machine or the filter of French-pressed coffee, so it is not recommended to use a blade grinder when making these two kinds of coffee. However, the blade type bean grinder also has certain advantages, compared with the gear type bean grinder, its grinding speed is faster and the noise is lower. Keep in mind that small changes in the particle size of coffee powder will directly affect the final quality of coffee, so we recommend that you use a tapered gear grinder. Bean grinders can be roughly divided into two types: gear type bean grinder and blade type bean mill. The working principle of the gear grinder is that two gear-shaped or conical grindstones rotate quickly to crush the coffee beans between them, generating very little heat in the process. This process of extrusion and crushing can well release the aromatic essence and oils in the coffee, making the coffee taste more mellow and silky. Generally speaking, the grinding degree of the gear type bean grinder is very wide, and it is suitable for all kinds of brewing methods, such as Italian espresso, French pressure coffee, drip filter coffee and so on.