What is the reason why the temperature of coffee extracted by coffee machine is too low?

What is the reason why the temperature of coffee extracted by coffee machine is too low?

Therefore, under such analysis, you will realize that the flow rate and state of espresso are not determined entirely by the force of pressing powder. 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 for 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. Many people will think that it is due to the lack of powder pressing and the breaking of pressed powder. If we carefully analyze what happens in the handle of espresso extraction, I believe you will reconsider whether you should only work on the power of powder pressing!

As we all know, there are many factors that affect espresso. My analysis means that under normal circumstances, do not dwell on the details.

First of all, let's talk about what's going on in the coffee handle. In this way, after pressing the coffee powder, because the coffee powder is solid, the water will accumulate in the gap between the brewing head and the coffee powder, resulting in the early extraction flow rate is too fine, resulting in excessive extraction, and the coffee powder will automatically expand when hot water passes through the coffee powder. the position of the powder will begin to rise, resulting in a large uneven gap between the coffee powder particles inside the coffee handle after a certain degree of expansion. Hot water will instantly penetrate the coffee powder in such a gap, resulting in a lack of extraction in the later stage. First of all, talk about the popular powder and filling pressure. Generally, the data given on the Internet or books are mostly (per person) 7 grams of powder, 15 color 20 kg of filling strength, the method of operation is to directly load the powder, load it to level with the edge of the handle, scrape the powder with a 45-degree angle with the top cover of the bean grinder, fill it, and get on the machine. Extraction state (general temperature and humidity environment, fresh coffee beans) is the first ten seconds is very fine, relatively stable, the liquid is dark brown, 12 seconds flow suddenly thick and speed up the flow rate, 15 seconds or so 30cc. Such a cup of esptesso is failed, the early extraction will be excessive, the scorched taste is quite obvious, the later extraction is unstable, the taste is messy, there is less oil, and even extreme bitter taste. Such a cup of coffee can be regarded as full of miscellaneous flavors!

Many people will think that it is due to the lack of powder pressing and the breaking of pressed powder. If we carefully analyze what happens in the handle of espresso extraction, I believe you will reconsider whether you should only work on the power of powder pressing! As we all know, espresso is quickly extracted from high-pressure water through nine atmospheric pressures, so the requirement for extraction is to stabilize the flow rate, and it is necessary to control the extraction time to produce 30cc in about 25 seconds, so that the taste of the coffee will be balanced. Only by letting the water evenly pass through the coffee powder can the flow rate be stable.

So the first requirement is to press the powder horizontally and evenly, without skew, so that the pressure on all parts of the coffee powder is equal.