What is the principle and principle of excessive coffee extraction?

What is the principle and principle of excessive coffee extraction?

The flow rate and state of espresso are not determined entirely by the force of pressing powder, and a series of reactions inside the handle show that in order to make the flow rate and extraction stable, it is necessary to ensure that the space of coffee powder expansion is reduced, and the gap after expansion is uniform, so that water can steadily and evenly pass through coffee powder to achieve uniform extraction and control the extraction time. Since the origin of the name espressso is related to pressure, I think it should refer to the water pressure of the coffee machine and the whole extraction pressure inside the handle of the coffee machine, so it is necessary to comprehensively consider the water and coffee powder and expansion space inside the handle, not just consider the pressure on the surface of coffee powder, understand this change and principle, you can adjust your grinding degree and powder pressure and extraction time.

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.