Container with twist-off closure

摘要

A container comprises a releasable metal closure formed with an end wall and a depending skirt and having an annular layer of sealing compound provided on the inside of the end wall adjacent the skirt and a container body comprising a neck with an annular sealing surface 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 and the closure 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 of the container body is formed with a localized protrusion or recess which provides a discontinuity in the annular sealing interface, whereby relative rotation of the closure and container body 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.

主权项

1. A container comprising:
a releasable metal closure including an end wall and a depending skirt, the closure having an annular layer of sealing compound on an inside surface of the end wall adjacent the skirt; and a glass container body comprising a neck with an annular sealing surface, the neck defining a circular opening of the body, the sealing surface defining a localized protrusion or recess, the sealing surface being adapted to form a sealing interface with the annular layer of sealing compound such that when the closure is in a closed position on the container body, the localized protrusion or recess provides a discontinuity in the annular sealing interface; wherein a seal is made by a partial vacuum formed in an interior of the container during processing without mechanical engagement between the closure and the container body; and whereby the container is configured such that relative rotation of the closure and the container body from the closed position creates a venting path proximate the discontinuity from the interior of the container body to an exterior of the container so that the seal is broken.