Packaging having a perforable lid

Abstract

The packaging ( 10 ) comprises a container ( 12 ) in the form of a cup which delimits an access opening ( 16 ) bordered by a peripheral band ( 20 ) for the fused bonding of a lid ( 14 ), and a lid ( 14 ) made of polymer for the initial sealing of the access opening ( 16 ), which lid ( 14 ) is maintained on the band ( 20 ) along a peripheral fused bond ( 22 ). The lid ( 14 ) comprises, away from the peripheral fused bond ( 20 ), in an area covering the access opening ( 16 ), a line ( 24 ) of weakening of the lid. The weakening line ( 24 ) and the fused bond ( 22 ) of the lid on the container ( 12 ) are such that the tear strength of the lid ( 14 ) along the weakening line ( 24 ) is lower than the tear strength of the fused bond ( 22 ).

1 . Packaging ( 10 ) comprising a container ( 12 ) in the form of a cup which delimits an access opening ( 16 ) bordered by a peripheral band ( 20 ) for the fused bonding of a lid ( 14 ), and a flexible lid ( 14 ) for the initial sealing of the access opening ( 16 ), which lid ( 14 ) is maintained on the band ( 20 ) along a peripheral fused bond ( 22 ), characterised in that the lid ( 14 ) comprises, away from the peripheral fused bond ( 22 ), in an area covering the access opening ( 16 ), a line ( 24 ;  124 ) of weakening of the lid which does not pass through the lid, the weakening line ( 24 ;  124 ) and the fused bond ( 22 ) of the lid on the container ( 12 ) being such that the tear strength of the lid ( 14 ) along the weakening line ( 24 ;  124 ) is lower than the tear strength of the fused bond ( 22 ) when a pressure is applied to the lid, said lid ( 14 ) being without a gripping tab which outwardly extends the weakening line beyond the peripheral fused bond ( 22 ).  
     
     
         2 . Packaging according to  claim 1 , characterised in that the weakening line ( 24 ) extends along a trace which is wholly contained within the area covering the access opening ( 16 ).  
     
     
         3 . Packaging according to  claim 2 , characterised in that the weakening line ( 24 ) delimits a closed shape which is wholly contained within the area covering the access opening ( 16 ).  
     
     
         4 . Packaging according to  claim 1 , characterised in that the weakening line ( 124 ) forms a line which extends at least in the area covering the access opening ( 16 ), between two separate points of the peripheral fused bond ( 22 ).  
     
     
         5 . Packaging according to  claim 1 , characterised in that the tensile strength of the lid along the weakening line ( 24 ;  124 ) is from 1 N/15 mm to 70 N/15 mm.  
     
     
         6 . Packaging according to  claim 1 , characterised in that the weakening line ( 24 ;  124 ) delimits a tongue ( 26 ) whose dimensions correspond substantially to the dimensions of a human finger.  
     
     
         7 . Packaging according to  claim 6 , characterised in that the weakening line ( 24 ;  124 ) forms at least one angular point ( 128 ) on the contour of said tongue ( 26 ).  
     
     
         8 . Packaging according to  claim 1 , characterised in that the lid ( 14 ) has a visible marking identifying the position of the weakening line ( 24 ;  124 ).  
     
     
         9 . Packaging according to  claim 1 , characterised in that the lid ( 14 ) has, along the weakening line ( 24 ;  124 ), at least one mechanical weakening treatment on at least one film of the lid.  
     
     
         10 . Packaging according to  claim 9 , characterised in that said mechanical weakening treatment comprises a microporous weakening.  
     
     
         11 . Packaging according to  claim 9 , characterised in that said mechanical weakening treatment comprises partially cutting at least one film of the lid ( 14 ) with the aid of a matrix of blades along the trace of the weakening line ( 24 ).  
     
     
         12 . Packaging according to  claim 1 , characterised in that the lid ( 14 ) has, along the weakening line ( 24 ;  124 ), a weakening treatment by high-energy radiation along at least one film of the lid.  
     
     
         13 . Packaging according to  claim 12  characterised in that the lid comprises at least two complexed films, the first film having undergone mechanical weakening treatment along the trace of the weakening line ( 24 ), the second film having undergone weakening treatment by means of high-energy radiation along the trace of the weakening line ( 24 ).  
     
     
         14 . Packaging according to  claim 1 , characterised in that the lid ( 14 ) is a complex in which the combination of films is selected from the group consisting of polyester (PET)/polyamide (OPA)/polypropylene (PP), polyester (PET)/polyamide (OPA)/polyethylene (PE), polyester (PET)/polypropylene (PP), aluminium/polyester (PET), aluminium/oriented polypropylene (OPP), layer of paper/polypropylene (PP), polyester (PET)/aluminium/cast polypropylene (PPC), polyester (PET)/aluminium/polyethylene (PE), oriented polyamide (OPA)/aluminium/cast polypropylene (PPC), oriented polyamide (OPA)/aluminium/cast polyethylene (PEC), polyester (PET)/polypropylene (PP)/polyester (PET), polyester (PET)/aluminium/polyethylene (PE), oriented polypropylene (OPP)/aluminium/polyethylene (PE), polyester (PET)/polyethylene (PE), oriented polypropylene (OPP)/polyethylene (PE), and paper/polyethylene (PE).  
     
     
         15 . Packaging according to  claim 1 , characterised in that the weakening line ( 24 ;  124 ) is in such a form that a sound is emitted when it is initially torn under the action of a gas flowing through the torn lid ( 14 ).  
     
     
         16 . Packaging according to  claim 1 , characterised in that it comprises a product contained in the container ( 12 ) and resting on a face of the container remote from the lid ( 14 ), and in that a free space ( 23 ) filled with a gas is defined between the lid ( 14 ) and the product, which free space ( 23 ) is sufficient to allow deformation of the lid inside the container ( 12 ) to initiate tearing of the lid ( 14 ), without the lid's coming into contact with the product.  
     
     
         17 . Packaging according to  claim 1 , characterised in that the weakening line ( 24 ) has a tear strength by application of a pressure on the lid ( 14 ) which varies along the length of the weakening line ( 24 ).  
     
     
         18 . Method of opening a packaging as defined in  claim 1 , characterised in that it comprises steps consisting in: 
 urging the lid ( 14 ) from the outside to the inside of the packaging by means of pressure, until the lid ( 14 ) tears along the weakening line ( 24 ;  124 );    grasping the lid ( 14 ) torn along the weakening line ( 24 ;  124 ); and    pulling on the part of the lid ( 14 ) that has been grasped in order to continue tearing the lid ( 14 ) along the weakening line ( 24 ;  124 ).    
     
     
         19 . Method according to  claim 18 , characterised in that it comprises a final phase of removing from the container ( 12 ) the part of the lid that has been grasped.  
     
     
         20 . Method according to  claim 19 , characterised in that the packaging is cording to  claim 4  and in that the method comprises a step of baring a portion of the peripheral nd for the fused bonding of the lid formed on the container.  
     
     
         21 . Method according to  claim 18 , characterised in that it comprises a step of introducing an auxiliary element through the torn lid.  
     
     
         22 . Method of opening a packaging as defined in  claim 1 , characterised in that it comprises steps consisting in: 
 heating the inside of the packaging in order to increase the pressure inside the packaging;    maintaining heating at least until the lid tears along the weakening line ( 24 ;  124 ).