Coffee capsule for preparing turkish coffee

1. A capsule designed for preparation of a beverage upon injection of liquid under pressure into the capsule, the capsule containing a substance for the preparation of the beverage and comprising a cup-shaped body, a top wall and a bottom retaining wall,

the capsule further comprises an opener designed to open the bottom retaining wall upon a rise in pressure in the capsule,

the opener comprises a plurality of first elements and associated secondary elements facing the retaining wall,

the first and secondary elements are homogenously arranged with respect to the circumference of the retaining wall,

the secondary elements each surrounding at least partially a respective first element and being arranged adjacent to but not in contact with the respective first element,

the first elements being non-linear elements, and the secondary elements being linear elements,

the secondary elements are arranged at a larger distance to the retaining wall than the first elements, a distance of the first elements to the retaining wall is 0 to 0.2 mm, and a distance of the secondary elements to the retaining wall is 0.5 mm to 1.2 mm,

the retaining wall is a thin film having a thickness of between 15 and 25 microns,

the substance is a precursor ingredient of roast and ground coffee, and the substance has a particle size between 100 microns and 330 microns,

the secondary elements each comprise three linear segments arranged to at least partially surround the respective first element, two of the three linear segments of each of the secondary elements are arranged at a first distance to the retaining wall, and one of the three linear segments of each of the secondary elements is arranged at a second distance to the retaining wall that is larger than the first distance, and the one of the three linear segments arranged at the second distance to the retaining wall is arranged radially outwards with respect to the respective first element; and

the opener further comprises third linear elements arranged to radially extend between the associated first and secondary elements, and the opener is configured to create at least one opening having a diameter between 0.3 mm and 10 mm in the retaining wall,

the capsule comprises a series of dispensing holes comprising a plurality of inner and outer dispensing holes, the inner dispensing holes are arranged radially inwards of the outer dispensing holes and each have a first diameter, and the outer dispensing holes each have a second diameter that is larger than the first diameter of the inner dispensing holes, wherein the first diameter is at least 0.4 mm, and

the capsule comprises an opening plate that comprises the first and secondary elements and the series of dispensing holes.

2. The capsule according to claim 1 , wherein the retaining wall is a thin film having a thickness of 20 microns.

3. The capsule according to claim 1 , wherein the third linear elements are arranged at the same distance to the retaining wall as at least two of the linear segments of the secondary elements.

4. The capsule according to claim 1 , wherein the opener is arranged in a bottom portion of the capsule.

5. The capsule according to claim 1 , wherein the opening plate is in a bottom portion of the capsule, and the opener protrudes from the opening plate.

6. The capsule according to claim 1 , wherein the second diameter is at most 1 mm.

7. The capsule according to claim 1 , wherein the first elements each comprise an upper planar front face arranged to abut at the retaining wall.

8. The capsule according to claim 5 , wherein the opening plate is rotationally symmetric.

9. The capsule according to claim 1 , wherein the first elements each have a Y-shape.

10. The capsule according to claim 1 , wherein a distance of the third linear elements to the retaining wall is 1.0 to 1.2 mm.

11. The capsule according to claim 1 , wherein an amount of the roast and ground coffee in the capsule is between 1.5 grams and 8 grams.

12. The capsule according to claim 1 , wherein the top wall has a thickness between 20 microns and 300 microns.

13. The capsule according to claim 1 , wherein the opener is configured to open the retaining wall upon a rise in pressure of 1.0 to 2.0 bar.