CONTAINER WITH TWIST-OFF CLOSURE

摘要

A container comprises a releasable metal closure 14 formed with an end wall 15 and a depending skirt 16 and having an annular layer 18 of sealing compound provided on the inside of the end wall adjacent the skirt and a container body 1 comprising a neck 2 with an annular sealing surface 4 surrounding a circular opening and adapted to seal against the annular layer of sealing compound over an annular sealing interface in the closed position of the closure on the container body. The container body 1 and the closure 14 are formed with no mechanical means for coupling them together to form or maintain a seal therebetween and the seal is provided by a partial vacuum formed in the container during processing. The annular sealing surface 4 of the container body 1 is formed with a localised protrusion 5 or recess 10 which provides a discontinuity in the annular sealing interface, whereby relative rotation of the closure 14 and container body 1 from the closed position creates a venting path from the interior of the container body to the exterior so that the seal is broken and the closure is released.