Container and closure lid

摘要

This invention provides a container and closure lid particularly suitable for packaging semi-solids and liquids which are to be frozen. The closure lid fits entirely into the mouth of the container, providing no easy method of removal absent use of a pull tab which incorporates a tamper-evident frangible pin. The closure lid incorporates a generally flat sided seal skirt which mates with a U-shaped seal channel on the container inner wall surface to prevent leakage past the seal skirt and a locking ridge having a flat top which mates with a locking ledge face on the container inner wall surface adjacent the container mouth. The seal skirt snaps under and is covered by the locking ledge to provide no purchase along the lid edge. The container seal channel not only provides part of the sealing mechanism of the invention but also prevents translation of the lid toward the container bottom while the container locking ledge prevents translation of the lid toward the container mouth. This back-to-back relationship enhances the positive positioning of the closure lid on the container even during freeze+544 thaw expansion and contraction of the contents. In one embodiment, the container incorporates a dimple ring as part of the seal channel which provides an interference fit to the inserted closure lid seal skirt, pressing the seal skirt against the opposing wall of the seal channel, thereby providing two regions of sealing between the seal channel and the inserted seal skirt.