Plastic closing cap with sealing ring

Abstract

A closing cap molded in one piece from a plastics material for sealing a container with a threaded neck has a top plate ( 3 ), an annular skirt ( 4 ) with an internal screw thread ( 5 ) adapted to cooperate with the threaded container neck ( 2 ), and an integrally molded deformable annular sealing ring ( 6 ) extending downwardly from an inner surface of said top plate ( 3 ) and spaced radially inwardly of the annular skirt ( 4 ), wherein when the closing cap ( 1 ) is screwed onto the container neck ( 2 ), the sealing ring ( 6 ) is deformed outwardly and is fully conformed to the outer surface of the container neck ( 2 ) without being clamped between the container neck ( 2 ) and the annular skirt ( 4 ) and without being pressed against the annular skirt ( 4 ).

1 . A closing cap moulded in one piece from a plastics material for sealing a container with a threaded neck comprising: 
 a top plate which is substantially in the form of a circular disc;    a substantially cylindrical peripheral portion extending downwardly from said top plate, said peripheral portion having an internal screw thread adapted to cooperate with the threaded container neck; and    an integrally moulded deformable annular sealing ring extending downwardly from an inner surface of said top plate and spaced radially inward of the substantially cylindrical peripheral portion, wherein when said closing cap is applied onto the threaded container neck, said sealing ring is adapted to radially deform outwardly and seal at least substantially along the outer surface of the container neck by virtue of the elastic return forces without being clamped between the container neck and the substantially cylindrical peripheral portion and without being pressed against said substantially cylindrical peripheral portion.    
   
   
       2 . The closing cap according to  claim 1 , wherein said sealing ring is substantially cylindrical.  
   
   
       3 . The closing cap according to  claim 1 , wherein said sealing ring is L-shaped.  
   
   
       4 . The closing cap according to  claim 1 , wherein said sealing ring has a uniform thickness of equal or less than 0.80 mm.  
   
   
       5 . The closing cap according to  claim 1 , wherein said outer surface of the container neck has, above its threads, an upwardly and inwardly directed tapered portion and a substantially radially inwardly directed rim and said sealing ring is disposed at a radius approximately equal to the radial distance of the middle of the tapered portion of the container neck.  
   
   
       6 . The closing cap according to  claim 5 , wherein said sealing ring is deformed radially outwardly by the tapered portion of the container neck and is fully conformed to the outer surface of the container neck by virtue of its elasticity without being pressed against the substantially cylindrical peripheral portion.  
   
   
       7 . The closing cap according to  claim 5  further comprising a continuous or discontinuous stop means extending downwardly from the inner surface of said top plate and disposed radially inwardly of said deformable sealing ring.  
   
   
       8 . The closing cap according to  claim 7 , wherein said stop means has an external diameter which is slightly smaller than an inner an inner diameter of the substantially radially inwardly directed rim of the container neck.  
   
   
       9 . The closing cap according to  claim 7 , wherein said stop means is adapted to limit the upwardly movement of the container neck.  
   
   
       10 . The closing cap according to  claim 7 , wherein said stop means is adapted to be inserted in the opening of the container neck after removal of a-sealing laminated disc.  
   
   
       11 . The closing cap according to  claim 10 , wherein said sealing ring only just during the reclosing procedure and after removal of the laminated disc first comes into contact with the tapered portion of the container neck and is thereby deformed.  
   
   
       12 . The closing cap according to  claim 7 , wherein said stop means is a shallow ring with a tapering conical tip.  
   
   
       13 . The closing cap according to  claim 7 , wherein said stop means is an annular disc.  
   
   
       14 . The closing cap according to  claim 1 , wherein said substantially cylindrical peripheral portion has at its distal end a tamper evident band for cooperation with a security band on the outer neck portion of the container neck.  
   
   
       15 . The closing cap according to  claim 1 , wherein said substantially cylindrical peripheral portion is provided with external knurling.  
   
   
       16 . The closing cap according to  claim 1 , wherein said closing cap is made by injection moulding.  
   
   
       17 . An assembly of a container having a threaded neck and a closing cap wherein said closing cap is moulded in one piece from a plastics material for sealing a container with a threaded neck and comprises: 
 a top plate which is substantially in the form of a circular disc:    a substantially cylindrical peripheral portion extending downwardly from said top plate, said peripheral portion having an internal screw thread adapted to cooperate with the threaded container neck; and    an integrally moulded deformable annular sealing ring extending downwardly from an inner surface of said top plate and spaced radially inward of the substantially cylindrical peripheral portion, wherein when said closing cap is applied onto the threaded container neck, said sealing ring is adapted to radially deform outwardly and seal at least substantially along the outer surface of the container neck by virtue of the elastic return forces without being clamped between the container neck and the substantially cylindrical peripheral portion and without being pressed against said substantially cylindrical peripheral portion.