Process
Nespresso's hermetically sealed capsules are made of aluminium foil. When the capsule is inserted into the machine, the top of the capsule is pierced. Some machines make a single large hole, and others make a number of smaller holes. When the machine is activated it pumps in hot water under high pressure. This causes the flat bottom of the capsule to bow out, as this is made of thinner foil than the rest of the capsule. The base of the capsule holder (on which the capsule sits) has a number of raised squares which cause the foil to rupture at these points. The brewed coffee exits the capsule through these rupture holes and flows into the coffee cup. There is a pressure release valve inside the brewing chamber which prevents an explosion occurring if the coffee exhaust path becomes blocked.
The spent capsule must finally be removed from the holder; on some machines this is automated.
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