Screw-connection closure with tamperproof strip

Abstract

In the case of screw-connection closures ( 1 ) with a pouring nozzle ( 2 ), on which a screw-connection cap ( 3 ) with a tamperproof strip ( 4 ) is placed in position, predetermined breaking point bridges ( 40 ) provided between the tamperproof strip ( 4 ) and screw-connection cap ( 3 ) are exposed to the risk of being prematurely destroyed during demoulding from the injection mould or when being placed axially in position on the pouring nozzle. According to the invention, posts ( 24 ) are arranged as restraining elements on the pouring nozzle ( 2 ). They engage in the tamperproof strip ( 4 ) prior to initial opening. The tamperproof strip ( 4 ) itself has weakened bending zones ( 43 ) in regions which are pushed outwards by the posts when being placed axially in position. The predetermined breaking point bridges ( 40 ) are arranged where the tamperproof strip ( 4 ) crosses over the lower periphery of the screw-connection cap ( 3 ) when it is being placed in position and subjected to maximum deformation. It is possible for the tamperproof strip, in addition to the weakened bending zones ( 43 ), to have elevated supporting zones ( 44 ), whereas the portions ( 45 ) located therebetween are of average height.

1 . A screw connection closure ( 1 ) comprising a pouring nozzle ( 2 ) with an external thread ( 21 ) and at least one restraining element ( 24 ) and a screw-connection cap ( 3 ) having a lateral wall ( 30 ) with internal threads, which mesh with the external thread ( 21 ) of the pouring nozzle ( 2 ) and a tamperproof strip ( 4 ) which is disposed by means of predetermined breaking points ( 40 ) in aligned relationship beneath the lateral wall of the screw-connection cap ( 30 ) and interacts with the at least one restraining element on the pouring nozzle, characterized in that three to five restraining elements ( 24 ) directed radially outwards are disposed on the pouring nozzle in the form of posts which have restraining surfaces that make contact at least in an opening direction and interact with abutment faces disposed on the tamperproof strip ( 4 ), wherein said tamperproof strip ( 4 ) has one bending zone ( 43 ), which reduces a cross-section of said tamperproof strip, in each region adjoining the abutment faces thereof, and in that furthermore predetermined breaking point bridges ( 40 ) are disposed laterally away from the bending zones ( 43 ) to an extent that a substantial relative displacement does not occur here when the tamperproof strip ( 4 ) is deformed upon placing the screw-connection cap ( 3 ) on the pouring nozzle. 
     
     
         2 . The screw connection closure ( 1 ) according to  claim 1 , characterized in that the tamperproof strip comprises sections having three different heights, wherein a lower periphery ( 41 ) of the tamperproof strip ( 4 ) runs in a plane perpendicularly to the an axis of rotation of the screw-connection closure ( 1 ). 
     
     
         3 . The screw connection closure ( 1 ) according to  claim 2 , characterized in that the sections having a least height form the bending zones ( 43 );
 the sections of average height ( 45 ) form regions in which the predetermined breaking point bridges ( 40 ) are disposed; and the sections with the a greatest height form the supporting zones ( 44 ).   
     
     
         4 . The screw connection closure ( 1 ) according to  claim 3 , characterized in that walls ( 46 ), which face radially inwards, are designed as abutment faces and between which the posts ( 24 ) lie in a tamperproof position prior to the initial opening, laterally and directly adjoin the bending zones ( 43 ). 
     
     
         5 . The screw connection closure ( 1 ) according to  claim 4 , characterized in that the posts ( 24 ) protrude radially outwards to an extent that outermost ends thereof at most align at least approximately with an outer surface of the tamperproof strip ( 4 ). 
     
     
         6 . The screw connection closure ( 1 ) according to  claim 3 , characterized in that the predetermined breaking point bridges ( 40 ) are longer than a distance between a top edge of a tamperproof strip section having the greatest height and a bottom edge of the lateral wall of the screw-connection cap. 
     
     
         7 . The screw connection closure ( 1 ) according to  claim 6 , characterized in that the predetermined breaking point bridges extend in an inclined manner. 
     
     
         8 . The screw connection ( 1 ) according to  claim 6 , characterized in that the predetermined breaking point bridges extend inwardly in an arched manner. 
     
     
         9 . The screw connection closure ( 1 ) according to  claim 5 , characterized in that the posts ( 24 ) each have an outer face ( 47 ) which extends from an inside to an outside and from top to bottom in an inclined or arched manner. 
     
     
         10 . The screw connection closure ( 1 ) according to  claim 1 , characterized in that the tamperproof strip ( 4 ) has regions with different wall thicknesses, the wall thickness being the least in regions of the bending zones ( 43 ). 
     
     
         11 . The screw connection closure ( 1 ) according to  claim 1 , characterized in that the pouring nozzle ( 2 ) forms a neck of a plastic bottle, on which neck the posts ( 24 ) are integrally formed. 
     
     
         12 . The screw connection closure ( 1 ) according to  claim 1 , characterized in that the pouring nozzle ( 2 ) is provided with a lower marginal flange which is suited for connecting to a tubular bag.