Closure device for a container made of laminated paper or cardboard

Abstract

During the opening of containers (B) to the top of which a stopper-type lower part ( 2 ) is fixed, a cylindrical piercing element ( 3 ) mounted in said lower part can be driven by a means ( 44 ) in such a way that it moves downwards in a helical manner in a screw cap ( 4 ). Said piercing element ( 3 ) has a cutting element ( 33 ) which cuts the container (B) open. If a plastic film of the container (B) consisting of laminated material does not separate from the tip ( 36 ) of the cutting element ( 33 ), the film stretches. The stretched film can then be pierced by a perforating tooth ( 38 ) succeeding the cutting element ( 33 ).

1 . Closure device ( 1 ) that can be provided over a pierceable point of a closed container (B), the container being made of laminated paper or cardboard and comprising at least one layer of plastics film, the device being made of plastics material and comprising a stopper-like lower part ( 2 ) with a cylindrical outlet connecting piece ( 20 ), which is connected or can be connected to the container, and a screw cap ( 4 ) which can be screwed onto the lower part ( 2 ), and a cylindrical piercing element ( 3 ) which is open on both sides in the axial direction and is displaceably mounted in the manner of a screw in the lower part, means ( 44 ) being provided in the screw cap ( 4 ) which move the piercing element ( 3 ) downwards in a helical manner on the first unscrewing movement of the screw cap, the cylindrical piercing element ( 3 ) comprising a ring ( 31 ) with external thread ( 32 ) and at least one cutting element ( 33 ) directed toward the container, characterised in that in the cutting direction (S) at least one perforating tooth ( 38 ) is arranged so as to be successive to a cutting region of the cuffing element ( 33 ) and so as to be successive with respect to the penetrating direction (E) of the leading tip ( 36 ) of the cutting element ( 33 ), which tooth, in the event that the at least one plastics film layer is not cut through, pierces the extended and stretched plastics film layer.  
   
   
       2 . Closure device according to  claim 1 , characterised in that the cylindrical piercing element ( 3 ) comprises only one cutting element ( 33 ) and the at least one perforating tooth ( 38 ) is arranged on the edge ( 35 ) following the foremost tip ( 36 ) and descending toward the ring.  
   
   
       3 . Closure device according to  claim 2 , characterised in that the at least one perforating tooth ( 38 ) is arranged on an elevation ( 39 ) on the descending edge ( 35 ).  
   
   
       4 . Closure device according to  claim 1 , characterised in that the cylindrical piercing element ( 3 ) comprises a plurality of cutting elements ( 33 ), at least one cutting element comprising at least one perforating tooth ( 38 ) on the edge ( 35 ) following the foremost tip ( 36 ) and descending toward the ring.  
   
   
       5 . Closure device according to  claim 4 , characterised in that at least two cutting elements are, with their respective foremost tip ( 36 ), arranged at an at least approximately equal distance (N) from the nearest edge of the ring ( 31 ) in each case.  
   
   
       6 . Closure device according to  claim 1 , characterised in that the cylindrical piercing element ( 3 ) comprises a deflector ( 34 ) following the at least one cutting element ( 33 ) in the cutting direction.  
   
   
       7 . Closure device according to  claim 1 , characterised in that the deflector ( 34 ) is combined with a cutting element ( 33 ) and is formed as a configuration of the descending edge ( 35 ).  
   
   
       8 . Closure device according to  claim 7 , characterised in that the at least one perforating tooth ( 38 ) is arranged on the deflector ( 34 ).  
   
   
       9 . Closure device according to  claim 5 , characterised in that there is a separate deflector ( 34 ) formed on the ring following the at least two cutting elements ( 33 ) in the cutting direction, the deflector comprising a perforating tooth ( 38 ) at the point most remote from the nearest edge of the ring ( 31 ).  
   
   
       10 . Closure device according to any one of  claims 6  to  9 , characterised in that the height of the deflector ( 34 ) is lower in the direction of penetration (E) than the height of all of the cutting elements ( 33 ).