Two-component plastic closure and method for producing said closure as a one-component part

Abstract

The plastic closure consists of an upper closure part ( 1 ) and a lower closure part ( 2 ) which in the condition of being used form separate parts ( 1,2 ). These two closure parts ( 1,2 ) are connected to one another as one piece via a hinge ( 7 ) or hinging strip ( 7 ), which permit the closure parts ( 1,2 ) to be pivoted apart by 180°. In this pivoted apart condition the closure is then injected as one-piece part in one go. The hinge ( 7 ) or hinging strip ( 7 ) is connected to one or both closure parts ( 1,2 ) via break-off locations. It may be torn away from these by hand and thus serves as a first-opening guarantee.

1 . A two-part plastic closure with an upper closure part ( 1 ) and with a lower closure part ( 2 ) which in the condition of use form two separate parts ( 1 ,  2 ), characterised in that the two closure parts ( 1 ,  2 ) are connected to one another as one piece via a hinge ( 7 ) or a hinging strip ( 7 ), which permits the closure parts ( 1 ,  2 ) to be pivoted apart by 180°, in which position the closure may be injected in one go as a one-piece part, as well as in that this hinge ( 7 ) or hinging strip ( 7 ) either via break-off locations is connected to at least one of the two closure parts ( 1 ,  2 ) so that by hand it may be torn away from the closure part ( 1 ,  2 ) concerned, or that the hinge ( 7 ) or hinging strip ( 7 ) comprises an initial-tear location so that by way of rotating the closure part ( 1 ) it begins to tear by shearing-off and is thus separable.  
     
     
         2 . A two-part plastic closure according to  claim 1 , characterised in that the hinge ( 7 ) or hinging strip ( 7 ) comprises an initial-tear location which consists of a thin region ( 36 ) within the injected film hinge ( 7 ), wherein after injection on both sides pieces ( 39 ,  40 ) are punched away from this film hinge so that the thin region ( 36 ) on both sides extends up to the edge of the acting hinge and by way of rotating the closure part ( 1 ) begins to tear by shearing-off and is thus separable.  
     
     
         3 . A two-part plastic closure according to  claim 1  characterised in that the hinge ( 7 ) or hinging strip ( 7 ) is connected to both closure parts ( 1 ,  2 ) via break-off locations so that it may be torn away from these by hand.  
     
     
         4 . A two-part plastic closure according to one of the claims  1  or  3 , characterised in that the break-off locations are formed by fine material bridges to the respective closure parts ( 1 ,  2 ).  
     
     
         5 . A two-part plastic closure according to one of the claims  1 ,  3  or  4 , characterised in that the break-off location is formed by a seam ( 8 ,  9 ) of a film hinge ( 7 ) to the respective closure part ( 1 , 2 ), wherein this seam ( 8 , 9 ) comprises a tear-start location so that it may be separated by hand by tearing the hinge ( 7 ) away from, the corresponding closure part ( 1 , 2 ).  
     
     
         6 . A two-part plastic closure according to one of the claims  1 ,  3 ,  4  or  5 , characterised in that the hinge ( 7 ) forms a film hinge and in the direction of its pivot at least on its one side there is formed a tab ( 10 ,  24 ,  26 ,  33 ) for tearing away the film hinge ( 7 ).  
     
     
         7 . A two-part plastic closure according to one of the claims  1  or  3 , characterised in that the two closure parts ( 1 , 2 ) are connected via a hinging strip ( 7 ) which running perpendicular to the pivot is formed on one of the two closure parts ( 1 , 2 ) via one or more fine material bridges, and that this strip ( 7 ) at its one end is shaped into a tab ( 10 ,  24 ,  26 ,  33 ) in a manner such that the break-off location may be separated by hand by tearing on the tab ( 10 ,  24 ,  26 ,  33 ).  
     
     
         8 . A two-part plastic closure according to one of the claims  1  or  3 , characterised in that the two closure parts ( 1 , 2 ) are connected via a hinging strip ( 7 ) which running perpendicular to the pivot is formed on both two closure parts ( 1 , 2 ) via one or more fine material bridges, and that this strip ( 7 ) at its one end or at both ends is shaped into a tab ( 10 ,  24 ,  26 ,  33 ) in a manner such that the break-off location may be separated by hand by tearing on the tab ( 10 ,  24 ,  26 ,  33 ).  
     
     
         9 . A method for manufacturing a two-part plastic closure in the form of a one-piece part, characterised in that the two closure parts ( 1 ,  2 ) with regard to their position on the closed closure are injected pivoted away from one another by 180° as a one-piece part and connected via a hinge ( 7 ) or hinging strip ( 7 ), wherein the hinge ( 7 ) or hinging strip ( 7 ) is connected at least to one of the two closure parts ( 1 , 2 ) merely via break-off locations or it comprises an initial-tear location in the form of a thin region ( 36 ) punched free.  
     
     
         10 . A method according to  claim 9 , characterised in that 
 a) the two closure parts ( 1 ,  2 ) with regard to their position on the closed closure are injected pivoted away from one another by 180° as a one-piece part and connected via a hinge ( 7 ) or hinging strip ( 7 );    b) the closure parts ( 1 , 2 ) and the hinge ( 7 ) or hinging strip ( 7 ) connecting them are ejected;    c) the closure parts ( 1 , 2 ) are pivoted together by 180° and in this position by way of material deformation are snapped into provided snap closures or in the-case of a threaded closure the inner thread ( 17 ) of the upper closure part ( 1 ) is pressed over the thread groove ( 13 ) of the lower closure part ( 2 );    d) for any realisation of a initial-tear location, pieces of the hinge ( 7 ) or hinging strip ( 7 ) laterally extending up to into the thin region ( 36 ) are cut away.