The skill of extracting espresso a family of coffee machines with their own characteristics
Different coffee machines have different principles for making coffee, and the coffee made will be different.
As we all know, coffee beans must be ground to improve the extraction rate, and then get the taste of coffee, and the wood fiber of coffee is insoluble in water, so the coffee liquid needs to be filtered or precipitated before drinking. Instant coffee is a kind of coffee solid soluble substance obtained from coffee extract. From the name, we can know that it can be directly dissolved by water without filtration. Different coffee machines have different principles for making coffee.
Pump coffee machine, is the principle of increasing pressure through the pump, using the pressure of 15bar to quickly extract the coffee essence, the coffee is more fragrant, and there will be a layer of coffee oil (crema).
The electric mocha coffee machine uses the pressure of 2bar or so to make the water in the lower pot produce water vapor at a suitable temperature. The steam goes up through a filter filled with coffee powder, distilling the essence of coffee, and then cooling the coffee steam in the upper pot, thus extracting a cup of mellow traditional Italian coffee.
The steam coffee machine, which evolved from the electric mocha coffee machine, has a very similar coffee extraction process. The water in the aluminum water tank is heated by a resistance located at the bottom of the fuselage, while the safety cover of the water tank seals the heat, creating 3.5bar pressure, pushing up the water, entering the special container through the filter device, or directly into the cup.
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