Beginners in coffee must learn-what is the channel effect in coffee?
What is the Coffee Channel Effect?
Simply speaking, in the process of making coffee, due to some reasons, water does not pass through or quickly flows through coffee powder.
Where do coffee channel effects often occur?
The channeling effect of coffee is common in two places:
1, manual brewing: familiar with the manual brewing friends must be made in the water pouring coffee powder, is not directly poured coffee powder and filter paper phase interface place, the reason is that if the water rushed to the powder and filter paper contact place, will lead to water does not pass through the coffee powder, but through the filter paper and filter cup gap directly into the coffee sharing pot, which will lead to coffee extraction problems. This is called the channel effect.
2, Espresso production: In fact, in the production process of Espresso, quite a lot of friends will not notice this problem, for example, after we have finished pressing powder, and then hit the powder bowl with a powder hammer, we can see coffee powder powder around the powder cake with a gap between the powder bowl.
Even if we tried to make up the pressure, it would only make up for the gap in the top layer, and there would still be a gap between the coffee cake and the filter bowl in the lower layer. Water is still the easiest to pass through, meaning more water flows around the cake than through the middle. This phenomenon is also known as the channeling effect.
How does the coffee channel effect affect coffee taste?
The channeling effect of coffee makes the extraction of coffee unstable and uneven.
Let us imagine that if we have a cake, the water flow from the four sides of the cake more than the middle, then it must lead to excessive extraction of coffee powder in the four sides and insufficient extraction of coffee powder in the middle. We're going to end up with a cup of coffee that tastes like a mess. That is: sour and bitter, sour because of insufficient extraction in the middle, bitter because of excessive extraction around. In addition, this cup of coffee drinks very water, the reason is that overall, this cup of coffee or partial extraction is insufficient.
Source: Know Coffee
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