What happened in the powder bowl of the espresso machine? -- bottomless powder bowl extraction

Italian coffee machine can be said to be the most widely used coffee machine in all kinds of cafes, from single-ended to double-ended, three-headed or more. Many coffee lovers or enthusiasts even buy quasi-professional and even professional Italian coffee machines at home. The common ones in China are Rancilio Silvia,Nuova Simonelli Oscar, Expobar Offica Leva, GLY Shuttle, Delong EC155, and Cankun 1817, which is called an entry-level toy by the majority of players.

No matter how these semi-automatic machines change, there must be a handle, and this is where the extracted coffee liquid flows out. But what exactly is released in the coffee powder bowl in the hand? Many people want to see the extraction process more intuitively, and through observation to further improve their powder pressing strength, adjust the powder quantity and grinding fineness, so someone will cut off the bottom of the hand, so as to see the extraction process directly. can constantly improve the skills of coffee production.

Cut off the bottom handle (bottomless handle)

Coffee comes out of the powder bowl.

As the pressure increased, the coffee liquid gradually flowed out.

The coffee gradually converges into the middle

Through this process, the deficiency of pressing powder can be seen and adjusted.