Portion capsule for preparing a brewed product

Abstract

A capsule containing an extraction substance, and having a basic body and a cover. The basic body has a floor region and an encircling side wall. The cover is fastened on the basic body along an encircling collar. The collar adjoins the encircling side wall in the direction of a cover side. The basic body has an essentially rectangular cross section in the region of the collar. The cover forms a curvature in the outward direction, and therefore the cover contributes to a capsule volume. An encircling surface, which is directed towards the cover side and extends from an outer edge of the collar as far as a starting point of the curvature. The starting point of the curvature is set inwards in relation to the transition between the side wall and the collar.

1 . A portion capsule that is filled with an extraction material, for creating a brewed product, comprising:
 a main body with a bottom region and with a peripheral side wall; and   a cover, which is fastened on the main body;   wherein the main body and the cover enclose the extraction material, and the cover is fastened on the main body along a peripheral collar, said collar towards a cover side connecting to the peripheral side wall;   wherein the main body in a region of the collar has an essentially rectangular cross section;   wherein the cover forms an outward arching, so that the cover contributes to a capsule volume;   wherein a peripheral surface facing the cover side is formed, said surface extending from an outer edge of the collar up to a base of the arching;   and wherein the base of the arching is offset inwards in comparison to a transition between the side wall and the collar.   
     
     
         2 . The capsule according to  claim 1 , wherein the base of the arching is offset inwards by at least 0.2 mm in comparison to the transition between the side wall and the collar. 
     
     
         3 . The capsule according to  claim 1 , wherein the main body and the cover are manufactured of plastic. 
     
     
         4 . The capsule according to  claim 3 , wherein the main body and the cover are manufactured by deep-drawing. 
     
     
         5 . The capsule according to  claim 3 , wherein the main body and the cover are manufactured by way of injection moulding. 
     
     
         6 . The capsule according to  claim 1 , wherein the main body and the cover have the same material composition. 
     
     
         7 . The capsule according to  claim 1 , wherein the main body and the cover have the same wall thickness. 
     
     
         8 . The capsule according to  claim 1 , wherein the capsule is cube-like with the exception of the collar. 
     
     
         9 . The capsule according to  claim 1 , wherein the cover, from the outside to the inside, comprises a collar region forming the peripheral surface facing the cover side, an actuate transition region and a flat region set away from a plane of the peripheral surface. 
     
     
         10 . The capsule according to  claim 9 , wherein the flat region assumes at least 40% of a cover surface. 
     
     
         11 . The capsule according to  claim 1 , wherein the cover comprises an energy director and is fastened on the main body by way of ultrasound welding. 
     
     
         12 . A method for manufacturing a capsule according to  claim 1 , comprising the steps of:
 providing a main body;   filling the main body with the extraction material;   placing cover upon the main body, so that the main body and the cover together form the peripheral collar; and,   fastening the cover on the main body along the peripheral collar amid the introduction of energy.   
     
     
         13 . The method according to  claim 12 , wherein the energy introduction is effected by ultrasound. 
     
     
         14 . The method according to  claim 13 , wherein the cover is provided with a peripheral energy director. 
     
     
         15 . The method according to  claim 12 , wherein the energy incorporation is effected by way of laser or by way of a heat transfer from a heated tool.