Closure for a Container

Abstract

A closure for a container comprises a circular base, a skirt extending from the periphery of the base, an outer seal, a plug seal in the form of an annulus, and at least one rib lying on the surface of the base in a substantially radial direction and in contact with the radially inner surface of the plug seal at one end for transferring any movement of the base, relative to the skirt, to the plug seal such that the plug seal is pulled radially inward to allow venting of excess pressure within the container. The outer seal of the closure comprises at least one deformation portion which partially interrupts the sealing effect of the outer seal in case overpressure occurs.

1 - 12 . (canceled) 
     
     
         13 . A closure for a container comprising a circular base, a skirt extending from the periphery thereof, a plug seal in the form of an annulus and at least one rib lying on the surface of the base in a substantially radial direction and in contact with a radially inner surface of the plug seal at one end for transferring any movement of the base, relative to the skirt, to the plug seal such that the plug seal is pulled radially inward to allow venting of excess pressure within the container, wherein the closure is provided with an outer seal having at least one deformation portion to deform in the case of overpressure to partially interrupt a sealing effect of the outer seal. 
     
     
         14 . The closure according to  claim 13 , wherein a top bulge is located at an underside of the base concentrically to and between the plug seal and the outer seal and interrupted with at least one gap. 
     
     
         15 . The closure according to  claim 14 , wherein the gap of the top bulge is aligned with the deformation portion. 
     
     
         16 . The closure according to  claim 13 , wherein the outer seal is inclined radially inwardly. 
     
     
         17 . The closure according to  claim 13 , wherein the outer seal is inclined radially outwardly. 
     
     
         18 . The closure according to  claim 13 , wherein an end of the rib in contact with the radially inner surface of the plug seal is thinner, in a plane parallel to the base, than in an area of the rib arranged spaced from the inner surface of the plug seal. 
     
     
         19 . The closure according to  claim 13 , wherein the rib has a first part and a second part, the second part terminating at an end in contact with the plug seal and the first part extending radially inwards from the other end of the second part. 
     
     
         20 . The closure according to  claim 19 , wherein the first part of the rib is substantially stiffer than the second part. 
     
     
         21 . The closure according to  claim 13 , wherein the rib is aligned to a deformation portion. 
     
     
         22 . The closure according to  claim 13 , wherein the deformation portions are distanced constantly and an angle included between lateral sides of the deformations portions is preferably between 34° to 50°. 
     
     
         23 . The closure according to  claim 13 , wherein a thickness of the deformation portions is preferably between 0.3 to 0.5 mm as compared to a thickness of 0.7 mm of the outer seal. 
     
     
         24 . The closure according to  claim 13 , wherein a circumferential length of the deformation portion is determined by a radial angle from the centre of the circular base including preferably between 6° to 30°. 
     
     
         25 . The closure according to  claim 22 , wherein the angle is between 34° to 45°. 
     
     
         26 . The closure according to  claim 22 , wherein the angle is between 34° to 40 °. 
     
     
         27 . The closure according to  claim 23 , wherein the thickness is between 0.3 to 0.4 mm. 
     
     
         28 . The closure according to  claim 23 , wherein the radial angle is between 6° to 20°. 
     
     
         29 . The closure according to  claim 23 , wherein the radial angle is between 6° to 15°.