Which component ensures espresso flows out without coffee grounds entering the shot tin?

Which component ensures espresso flows out without coffee grounds entering the shot tin?

• A. Hopper
• B. Portafilter
• C. Dosing chamber
• D. Grinding burrs

Answer: (B)

During espresso extraction, the filtration happens in the portafilter. It locks into the machine’s group head and holds a metal basket with a fine filter screen. When water is forced through the packed grounds, the screen traps most of the coffee particles, so the liquid that exits drips into the shot tin without grounds. The hopper stores beans before grinding, the dosing chamber measures the dose, and grinding burrs turn beans into grounds, but none of those directly prevent grounds from entering the shot—that job is done by the portafilter’s filter basket.

During espresso extraction, the filtration happens in the portafilter. It locks into the machine’s group head and holds a metal basket with a fine filter screen. When water is forced through the packed grounds, the screen traps most of the coffee particles, so the liquid that exits drips into the shot tin without grounds. The hopper stores beans before grinding, the dosing chamber measures the dose, and grinding burrs turn beans into grounds, but none of those directly prevent grounds from entering the shot—that job is done by the portafilter’s filter basket.