Do you know how to extract coffee? The core process of extraction principle

Many of us may choose instant coffee or go to a coffee shop for convenience, but there are also some coffee lovers who like to drink their own ground coffee. I wonder if you like to grind and extract your own coffee? Do you know the principle of extraction?

The core process of the extraction principle:

1. Grind coffee beans to increase the surface area of coffee in contact with water

two。 Coffee powder is fully soaked in aqueous solution, and coffee essence is hydrophilically dissolved.

3. Separate the coffee solution and coffee grounds.

All modern coffee extraction is the two core processes of soaking and filtration, which belongs to the category of physics, and there is basically no chemical change in the process. The differences in the thickness of coffee powder, the length of soaking time, the method of separation and filtration, and so on, have created a wealth of coffee brewing utensils and techniques. Although the core process of coffee extraction is the same, according to the significant differences in pressure and time used in coffee extraction, modern coffee extraction methods can be simply divided into two types:

1. Italian quick espresso

This method uses 9 atmospheric pressure, 88 °C Mel 95 °C water temperature, 22s-27s seconds to extract 30 ml of espresso; this is significantly different from other coffee extraction methods, which can be done under unnatural conditions, reflecting the intervention of science and technology. Espresso Espresso can generally be made by Italian semi-automatic coffee machine and full-automatic coffee machine. A good Espresso requires higher price and quality of coffee machine and bean grinder.

2: immersion extraction

It is a traditional, natural and simple way of coffee extraction; the extraction temperature is close to 85-92 and the filtration pressure is about 1 atmospheric pressure. It can be subdivided into:

(1) pressure filtration: use artificial pressure to filter coffee, including French kettle and Ella pressure.

(2) siphon: use the pressure difference caused by steam cooling to filter coffee, including siphon coffee maker Syphon, Belgian coffee maker

(3) drip filtration: natural gravity drip filter coffee, including American electric drip coffee maker, Vietnam drip coffee maker, Swiss gold Swissgold kf-300 drip coffee maker, hand filter module, ice drip coffee maker, etc.

(4) Steam pressurization: Italian mocha pot Moka, many manufacturers claim that mocha pots can make Espresso for commercial interests, but the coffee made by early mocha pots is essentially different from modern Espresso coffee. The pressure of mocha pots is only more than 1: 00 atmospheric pressure, and the pressure and final coffee extraction time may not be as fast as siphon coffee pots. According to the performance index, we still classify the mocha pot as the natural traditional immersion extraction.

Having said so much, I believe you also understand the principle and method of extraction? You can try it when you make your own coffee.