Sealing device for drink packages

Abstract

The invention relates to a sealing device ( 3, 30 ) for sealing off an opening ( 5 ) of a plastic drink package. Said sealing device ( 3, 30 ) has a flexible collar ( 10 ) that is provided with an inward-facing surface ( 45 ) that is subject to the internal pressure. The collar ( 10 ), in the closed position of the sealing device ( 30 ), is functionally linked with a collar rim ( 11 ) of the opening ( 5 ) to be sealed off and is adapted to exert a pressure (K) thereon that increases in proportion to the internal pressure (P).

1 . A sealing device ( 3 ,  30 ) for sealing an opening ( 5 ) of a drinks package of plastic, characterised by a flexible collar ( 10 ) which comprises an inwardly directed surface ( 45 ) exposed to the inner pressure, said collar ( 10 ) in a closure position of the sealing device ( 30 ) being in active connection with a neck rim ( 11 ) of the opening ( 5 ) to be sealed, in a manner such that the collar ( 10 ) is pressed onto the neck rim ( 11 ), wherein the pressing force (K) increases proportionally to the inner pressure (P).  
     
     
         2 . A sealing device ( 3 ,  30 ) according to  claim 1 , characterised in that the collar ( 10 ) is directed radially inwards.  
     
     
         3 . A sealing device ( 3 ,  30 ) according to  claim 1 , characterised in that the collar ( 10 ) is designed running obliquely inwards at an angle (α).  
     
     
         4 . A sealing device ( 3 ,  30 ) according to one of the preceding patent claims, characterised in that the collar ( 10 ) and/or the neck rim ( 11 ) comprises means which effect a concentration of the sealing force.  
     
     
         5 . A sealing device ( 3 ,  30 ) according to patent  claim 4 , characterised in that the means are a circumferential, concentrically arranged bead.  
     
     
         6 . A sealing device ( 3 ,  30 ) according to one of the preceding claims, characterised in that the collar ( 10 ) has a variable wall thickness.  
     
     
         7 . A sealing device ( 3 ,  30 ) according to one of the preceding patent claims, characterised in that the collar ( 10 ) comprises a (sharp) bend.  
     
     
         8 . A sealing device ( 3 ,  30 ) according to one of the preceding patent claims, characterised in that the collar ( 10 ) is supported by ribs ( 41 ).  
     
     
         9 . A sealing device ( 3 ,  30 ) according to one of the preceding patent claims, characterised in that the collar ( 10 ) has a hardness which lies in the region of 20 to 80 Shore A.  
     
     
         10 . A hinge closure ( 20 ) with a sealing means ( 3 ,  30 ) according to one of the preceding patent claims.