Vad är den fungerande princip av en italiensk kaffe maskin?

It usually has a boiler to generate hot water, pressurizes the hot water to about 9 atmospheres, and then flows through the powdered coffee beans in the metal filter to brew coffee. The coffee brewed by this kind of pressurized hot water is thicker than ordinary and contains emulsified oils. It is usually called espresso or espresso. There are many types of espresso machines. For general commercial use, the most common one is a single boiler, then there are double boilers, and there are also multiple boilers. Of course, the price also becomes more expensive. In addition to the general electronic control switch, there are also pulleys. There are different types of pull-out espresso machines.