What is the use of the hole behind the Nespresso aluminum capsule? Explanation on the principle of capsule Coffee extraction

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How on earth is Nespresso's capsule coffee extracted? I believe many people have the same question.

Today, I would like to share with you, see the picture below?

Many people don't know the head and tail of the capsule coffee cup.

We say that the cup mouth (head) of the capsule is covered by aluminum sheet, which is 37mm in diameter.

The bottom of the capsule is as cocky as the ass.

Specially let the machine bite three holes!

Water injection hole: the three holes at the bottom of the capsule cup.

The hole in the mouth of the cup: the 25 holes in which the coffee comes out.

The water is injected from the bottom, because the mouth of the capsule is covered by aluminum, there is enough time to extract coffee due to resistance, and the pressure breaks through the aluminum sheet (25 holes).

It is because the aluminum sheet is sealed that Nespresso coffee has so much delicious Crema (it symbolizes the attractive oily layer on top of a good espresso)

You may not be very clear about it.

Here are the needles in the Nespresso coffee machine, which are punctured only by the "piercing function".

Water is injected into the capsule through the three holes above. See-- these are needle versions, not "pinholes."

When injecting water, some of the things that rush into the capsule cup will turn into coffee, and those outside the capsule will flow into the waste water box.

Is it still not clear? So, um... There's nothing I can do.

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