How to extract coffee there are several ways to introduce the best standard time

Prepreg is a subject that takes place in the production of esp.

Prepreg occurs within 1-2 seconds after pressing the extraction key, which is so short that it seems negligible, but what happens in this 1-2 seconds affects the subsequent extraction state, that is, the taste of coffee.

What is the function of prepreg?

In fact, pre-soaking and steaming are roughly the same, that is, wetting the surface of coffee, making coffee pressed powder expand rapidly, making pressed powder form a good filter layer. In theory, the expansion space of coffee powder is about 1-2mm. The expansion makes a uniform bubble gap between coffee powder particles, so that water passes through quickly and evenly. The function of pre-impregnation is to expand between these coffee particles to form a uniform gap, so that the aroma of coffee can be released as much as possible.

When making hand-brewed coffee, most people pay a lot of attention to the softness of the current and the freshness of the coffee powder, and steaming is also indispensable. Good steaming can fully infiltrate the coffee powder, activate the coffee activity, and form a good gap between the coffee particles, thus making the coffee extraction process more smooth. The so-called activation is to make the coffee powder have a bulging state similar to a volcanic eruption. the coffee powder rises upward, the air between the coffee particles will be heated and expanded, and the coffee particles themselves will release a large amount of carbon dioxide. bubble-like voids are formed between the particles, which make the coffee powder form a uniform filter layer to provide the space needed for hot water to pass through.

The voids formed by good coffee steaming are approximately uniform, and the flow rate of coffee liquid filtered downward is also uniform. If a good filter layer can not be formed, then stagnant water will be formed, the drip filtration rate will be slowed down, the extraction time will be prolonged, and then the phenomenon of excessive extraction will be formed. Coffee taste will also be messy, sour and astringent, coffee itself is difficult to reflect, the taste is thin, irritating, and the aroma is not dignified.

The first is the choice of instruments for production. Good filter cups and filter paper are not only necessary for making good coffee, but also necessary for good steaming. The high-quality brand filter cup design groove can make the air fluidity is good, will not let the gas gush out from the coffee surface, the water permeability of the high-quality filter paper will also make the hot water pass through quickly, will not form the dripping filtration speed sometimes fast and sometimes slow.

Second, it is necessary to have a suitable hand flushing pot, which can well control the outlet speed and flow rate, flow rate, as well as the softness and hardness of the flow.

Third, water quantity. Steaming water does not need too much, only need to wet the surface of coffee, but need to be soft and light, fast and uniform, like spring rain moisturizer, so that the steaming speed can be carried out at the same time.

Fourth, the temperature of the water. I personally think that the best temperature for making hand-brewed coffee is 83 degrees, and the highest temperature should not exceed 90 degrees. This kind of water temperature will not produce too much bitterness or sour taste when steaming, and it can also make the coffee fully expand.