Container for the preparation of beverage comprising an improved perforable foil and method for preparing a beverage

Abstract

A portioned container ( 1 ), for the preparation of a beverage in a beverage producing device, comprising a body ( 2 ) having a main cavity ( 3 ) and a foil ( 6 ) connected to the body for closing said main cavity; said main cavity ( 3 ) containing beverage ingredients ( 5 ), wherein the foil ( 6 ) is perforable in axial direction above the cavity by an elongated intruding member ( 15 ) of the beverage preparation device, wherein the foil ( 6 ) comprises at least a base layer ( 7 ) and at least a tightness-producing layer ( 8 ); said tightness-producing layer ( 8 ) constituting an inner layer underneath the base layer ( 7 ); wherein said tightness-producing layers ( 8 ) and said base layer ( 7 ) are adhesively bonded above the cavity ( 3 ) at least in a first region ( 9 ) of the foil and are free of adhesive bond in at least a second region ( 10 ) or tightness-producing region of the foil such second region being the region intended for being perforated by the elongated intruding member ( 15 ) forming a tightness engagement with the surface of the elongated intruding member ( 15 ).

1 . A portioned container, for the preparation of a beverage in a beverage producing device, comprising: a body having a main cavity and a foil connected to the body for closing the main cavity; the main cavity containing beverage ingredients;
 the foil is perforable in an axial direction above the cavity by an elongated intruding member of the beverage preparation device,   the foil comprises at least a base layer and at least a tightness-producing layer;   the tightness-producing layer comprising an inner layer underneath the base layer;   the tightness-producing layers and the base layer are adhesively bonded above the cavity at least in a first region of the foil and are free of adhesive bond in at least a second region or tightness-producing region of the foil, the second region being the region intended for being perforated by the elongated intruding member and forming a tightness engagement with the surface of the elongated intruding member.   
     
     
         2 . Container according to  claim 1 , wherein the second region, in which the base layer and the tightness-producing layer are free of adhesive bond, represents less than a third of the total surface area of the foil above the cavity. 
     
     
         3 . Container according to  claim 1 , wherein the tightness-producing layer has an elongation at break of at least 200% (ISO527-3). 
     
     
         4 . Container according to  claim 1 , wherein the second region in which the base layer and the tightness-producing layer are free of adhesive bond, is a circular region in the central axis of the capsule. 
     
     
         5 . Container according to  claim 1 , wherein the tightness-producing layer is made of a material selected from the group consisting of PP, PE and their copolymers or their terpolymers, PVC, elastomeric thermoplastic, a biodegradable material and combinations thereof. 
     
     
         6 . Container according to  claim 5 , wherein the tightness-producing layer is formed of PP having a thickness of between 3 and 500. 
     
     
         7 . Container according to  claim 1 , wherein the base layer has an elongation at break which is less than the elongation at break of the tightness-producing layer. 
     
     
         8 . Container according to  claim 1 , wherein the base layer comprises at least one sub-layer configured for forming a decorative or printable support. 
     
     
         9 . Container according to  claim 1 , wherein the base layer comprises a material selected from the group consisting of aluminium, polyester, polyolefin, polyamide, starch, and combination thereof. 
     
     
         10 . Container according to  claim 9 , wherein the base layer comprises an additional gas barrier sub-layer. 
     
     
         11 . Container according to  claim 10 , wherein the gas barrier sub-layer is a material selected from the group consisting of: aluminium, EVOH, PA6, Siox or Alox coating and combinations thereof. 
     
     
         12 . Container according to  claim 8 , wherein the foil comprises a base layer with two sub-layers. 
     
     
         13 . Container according to  claim 8 , wherein the tightness-producing layer is made of polypropylene. 
     
     
         14 . Method for preparing a beverage from a container beverage preparation device comprising:
 providing a portioned beverage container in the beverage preparation device,   axially inserting through a foil of the container, at least one elongated intruding member comprising at least one liquid outlet opening; wherein during insertion, a tightness-producing layer of the container, the tightness-producing layers and the base layer are adhesively bonded above the cavity at least in a first region of the foil and are free of adhesive bond in at least a second region or tightness-producing region of the foil, the second region being the region intended for being perforated by the elongated intruding member, stretches to form a stretched portion at least until it becomes perforated by the intruding member, and   injecting liquid in the container through the intruding member.   
     
     
         15 . Method according to  claim 14 , wherein the stretched portion of the tightness-producing layer forms a tight sealing engagement on the surface of the elongated intruding member above the at least one outlet opening.