Method for preparing a drink and capsule for application of this method

A method for preparing a drink by passing hot water in a capsule (1) which has a first wall (2) and a second wall (3) and which contains a substance (5) to be extracted, the method comprising the operating steps of:

• creating a first opening through the first wall (2) of the capsule (1);
• creating a second opening (7) through the second wall (3) of the capsule (1);
• injecting hot water into the capsule (1) through the first opening;
• and
• making the drink flow out through the second opening (7);
• the method being characterised in that the step of creating the second opening (7) in turn comprises the operating steps of:
• making at least one cut (10) extending in a linear fashion through the second wall (3) of the capsule (1), substantially without removing material from it, said cut (10) being delimited by two adjacent portions (11) of the second wall (3);
• allowing the adjacent portions (11) of the second wall (3), which delimit the cut (10), to draw near one another again if necessary;
• and
• after said drawing near again and by means of said injection of hot water, increasing the internal pressure in the capsule (1) to cause, in succession:
• at least partial expulsion of the air contained in the capsule without substantial dispensing of the drink;
• and
• by means of an outward deformation of the second wall (3) at least at said adjacent portions (11), a movement away from one another by the adjacent portions (11) delimiting the cut (10), allowing the drink to flow out.