Two-material capsule

Abstract

This capsule ( 1000 ) comprises a body ( 1004 ) in the form of a cup and a seal ( 1006 ) delimiting together a chamber ( 1008 ) containing a substance for preparing a drink. The body ( 1004 ) comprises: an outer substantially frusto-conical side wall ( 1010 ), a base ( 1012 ) made in the same material with the side wall ( 1010 ) and closing the side wall ( 1010 ) at a rear end ( 1020 ) of the body ( 1004 ), and an annular rim ( 1016 ) extending radially outwards from the side wall ( 1010 ) and delimiting the front end ( 1022 ) of the body ( 1004 ). The seal ( 1006 ) closes the outer side wall ( 1010 ) at the front end ( 1022 ). The base ( 1012 ) and the wall ( 1010 ) are made in a first plastic material, the annular rim ( 1016 ) being formed in a second plastic material different from the first plastic material.

1 . A capsule for extracting a pressurized drink, the capsule comprising a body in the form of a cup and a seal delimiting together a chamber containing a substance for preparing a drink, the body comprising:
 an outer substantially frusto-conical side wall,   a base, made in the same material as the outer side wall and closing the outer side wall at a rear end of the body, and   an annular rim extending radially outwards from the outer side wall and delimiting the front end of the body,   the seal closing the outer side wall at the front end, the capsule being adapted so as to be positioned in an extraction device so that a pressurized extraction liquid penetrates into the capsule through the base and flows out therefrom through the seal characterized in that the base and the wall are made in a first plastic material, the annular rim being formed in a second plastic material, different from the first plastic material.   
     
     
         2 . The capsule according to  claim 1 , wherein the first plastic material is polyamide. 
     
     
         3 . The capsule according to  claim 1 , wherein the second plastic material is polyurethane. 
     
     
         4 . The capsule according to  claim 1 , wherein the second plastic material is a thermoplastic elastomer. 
     
     
         5 . The capsule according to  claim 1 , wherein the second plastic material is thermoplastic polyurethane. 
     
     
         6 . The capsule according to  claim 1 , the second plastic material is an elastomerized polyamide. 
     
     
         7 . The capsule according to  claim 1 , wherein the outer side wall comprises an inner surface, oriented towards the chamber, and an outer surface opposite to the inner surface, the outer surface defining a shoulder for connecting the annular rim to the outer side wall. 
     
     
         8 . The capsule according to  claim 1 , wherein the outer side wall defines a groove for connecting the annular rim to the outer side wall, the annular rim including an annular protrusion cooperating with the groove for reinforcing the connection of the annular rim to the outer side wall. 
     
     
         9 . The capsule according to  claim 1 , wherein the first plastic material is not colored in the bulk. 
     
     
         10 . The capsule according to  claim 1 , wherein the second plastic material is colored in the bulk. 
     
     
         11 . The capsule according to  claim 1 , wherein the base is formed by a peripheral region delimiting a rear end of the body, and by a central region entering towards the inside of the capsule relatively to the rear end while defining a recess outside the body, the central region comprising at least an area of lower strength intended to at least partly break under the pressure of a pressurized liquid. 
     
     
         12 . The capsule according to  claim 11 , wherein said or each area of lower strength is adapted so as to break at a pressure of the pressurized liquid comprised between 1 and 3 bars. 
     
     
         13 . The capsule according to  claim 11 , wherein before breakage of said or each area of lower strength, the base and the outer side wall of the body are impervious to air and to liquids. 
     
     
         14 . The capsule according to  claim 1 , wherein the seal comprises a filter and a membrane. 
     
     
         15 . The capsule according to  claim 14 , wherein the filter is set back from the front end of the body towards the chamber, the membrane extending along the front end. 
     
     
         16 . The capsule according to  claim 15 , wherein the gap between the filter and the membrane is filled with nitrogen. 
     
     
         17 . The capsule according to  claim 14 , wherein the membrane is peelable. 
     
     
         18 . A system comprising a capsule according to  claim 1  and an extraction device including a housing intended for receiving the capsule, a support, and a conduit for supplying a pressurized extraction liquid.