Beverage preparation capsule

1. A beverage preparation capsule comprising:

a capsule body comprising a cavity containing a beverage preparation ingredient, the capsule body comprising:

a front sheet of flexible film material having an inner surface and a lower edge and a back sheet of flexible film material having an inner surface and a lower edge, the inner surface of the front sheet facing the inner surface of the back sheet; and

a strip of flexible material separate and distinct from the front and back sheets, the strip of flexible material being coupled to the inner surfaces of the front and back sheets at a location that is adjacent to the lower edges of the front and back sheets, wherein the strip of flexible material is bonded to itself to form a seal in an outlet region of the capsule body;

wherein the strip of flexible material, prior to introduction of a liquid into the capsule body, extends inwardly from the inner surfaces of the front and back sheets to form a rounded portion of the strip of flexible material; and

wherein the front and back sheets are not directly bonded to one another along the outlet region of the capsule body.

2. The beverage preparation capsule according to claim 1 further comprising at least one perforation located along the rounded portion of the strip of flexible material, the at least one perforation forming an opening through the strip of flexible material prior to introduction of the liquid into the capsule body.

3. The beverage preparation capsule according to claim 1 wherein the strip of flexible material comprises an inner surface and an outer surface, a first portion of the outer surface of the strip of flexible material being bonded to the inner surface of the front sheet, a second portion of the outer surface of the strip of flexible material being bonded to the inner surface of the back sheet, and a first portion of the inner surface of the strip of flexible material being bonded to a second portion of the inner surface of the strip of flexible material to form the seal in the outlet region of the capsule body.

4. The beverage preparation capsule according to claim 3 wherein the strip of flexible material comprises a first edge and a second edge, the first edge being located adjacent to the lower edge of the front sheet and the second edge being located adjacent to the lower edge of the back sheet, and wherein the first and second portions of the inner surface of the strip of flexible material are located between the first and second edges of the strip of flexible material and the rounded portion of the strip of flexible material.

5. The beverage preparation capsule according to claim 3 wherein, upon introduction of the liquid into the cavity of the capsule body, the rounded portion of the strip of flexible film material everts downwardly and the seal in the outlet region of the capsule body opens.

6. The beverage preparation capsule according to claim 5 wherein upon the rounded portion of the strip of flexible film material everting downwardly, the outer surface of the strip of flexible material forms a concave surface that faces away from the outlet region, the beverage preparation ingredient sitting atop of the concave surface.

7. The beverage preparation capsule according to claim 1 wherein the strip of flexible film material comprises a lower portion that extends between the seal and the lower edges of the front and back sheets of flexible film material.

8. The beverage preparation capsule according to claim 1 further comprising a layer of nonwoven textile filtration material abutting or laminated to the strip of flexible material on an upstream surface thereof.

9. The beverage preparation capsule according to claim 1 wherein the capsule body comprises a longitudinal axis and the strip of flexible material comprises an inner surface that faces away from the inner surfaces of the front and back sheets, a first portion of the inner surface of the strip of flexible material located on a first side of the longitudinal axis being bonded to a second portion of the inner surface of the strip of flexible material located on a second side of the longitudinal axis to form a bottom seam of the capsule body, and wherein an upper portion of the strip of flexible material is located between the bottom seam and a top end of the capsule body and a lower portion of the strip of flexible material is located between the bottom seam and a bottom end of the capsule body.

10. A beverage preparation capsule having a beverage preparation ingredient sealed therein, the beverage preparation capsule comprising:

front and back sheets of flexible film material having inner surfaces that face one another, the front and back sheets comprising top edges and side edges that are at least partially bonded together;

a gusset sheet formed from a flexible film material having an outer surface, an inner surface, a margin region, and a central region, the outer surface of the gusset sheet along the margin region coupled to inner surfaces of the front and back sheets at bottom ends of the front and back sheets;

wherein the inner surface of the gusset sheet located along the margin region is bonded to itself to form a seal in an outlet region of the beverage preparation capsule;

wherein the central region of the gusset sheet is provided with a plurality of perforations or a zone of weakness;

wherein the beverage preparation ingredient is supported by the outer surface of the gusset sheet; and

wherein the seal in the outlet region is configured to be broken during beverage preparation to allow escape of a beverage through the outlet region.

11. The beverage preparation capsule according to claim 10 , wherein the gusset sheet is separate and distinct from the front and hack sheets.

12. The beverage preparation capsule according to claim 10 wherein the seal in the outlet region is provided by a pressure sensitive or heat sensitive adhesive.

13. The beverage preparation capsule according to claim 10 wherein the seal in the outlet region is configured to be broken by releasing the bond of the gusset sheet to itself by elevated temperature and/or pressure inside the beverage preparation capsule to allow the beverage to escape from the beverage preparation capsule through the plurality of perforations in the gusset sheet, wherein the gusset sheet allows the beverage to pass through the plurality of perforations in the gusset sheet after the seal is broken while retaining the beverage preparation ingredient inside the beverage preparation capsule.

14. The beverage preparation capsule according to claim 10 wherein the margin region of the gusset sheet is free of perforations.

15. The beverage preparation capsule according to claim 10 further comprising a liquid injection nozzle bonded to the front and back sheets, the liquid injection nozzle comprising a bore through which liquid can be injected to prepare the beverage in the beverage preparation capsule.

16. A beverage preparation capsule comprising:

a capsule body comprising a cavity containing a beverage preparation ingredient, the capsule body comprising:

a front sheet of flexible film material having an inner surface and a lower edge and a back sheet of flexible film material having an inner surface and a lower edge, the inner surface of the front sheet facing the inner surface of the back sheet; and

a strip of flexible material separate and distinct from the front and back sheets, the strip of flexible material being coupled to the inner surfaces of the front and back sheets at a location that is adjacent to the lower edges of the front and back sheets;

wherein the capsule body comprises a releasable seal in an outlet region, and wherein a lower portion of the strip of flexible material extends between the releasable seal and the lower edges of the front and back sheets of flexible film material.

17. The beverage preparation capsule according to claim 16 wherein the strip of flexible material extends inwardly from the inner surfaces of the front and back sheets to form a rounded portion of the strip of flexible material.

18. The beverage preparation capsule according to claim 16 wherein the front and back sheets are not directly bonded to one another along the outlet region of the capsule body.

19. The beverage preparation capsule according to claim 16 wherein the strip of flexible film material comprises an outer surface that is bonded to each of the front and back sheets of flexible film material, a central portion that extends between the front and back sheets of flexible film material, and an inner surface that is bonded to itself to form the releasable seal in the outlet region.