| 摘要 |
The invention relates to a sealed capsule for preparing a beverage by injecting pressurised water, including a sidewall (2), a bottom wall (4), and a top wall (6) defining a hermetically sealed space containing a substance to be extracted, the bottom wall and the sidewall being made as an integral part forming a rigid or semi-rigid shell, a collar (10) extending from one end of the sidewall, the top wall being provided in the form of a flexible membrane attached to the collar, the bottom wall being configured so as to be perforated by perforation tips of a perforating plate when a certain water pressure is reached inside the capsule, characterised in that the bottom wall includes a main central portion (20) to be perforated and a folded portion (22) rigidly connecting the main central portion to the sidewall, the folding portion including one or more folds (18, 24, 28) enabling the central portion to move toward the inside and outside of the capsule at an amplitude corresponding to an amplitude required for perforating the bottom wall without applying sideways tension to the bottom wall. |
