RETORT CONTAINER WITH THERMALLY FUSED DOUBLE-SEAMED OR CRIMP-SEAMED METAL END

摘要

A retort container includes a metal end (30) applied and sealed to an all-thermoplastic container body (22) by a crimp-seaming or double-seaming operation. The metal end has an outer curl (36) joined to a chuck wall (38) that extends down from the curl. One or both of the inner surface of the container side wall (24) and the outer surface of the chuck wall has/have a heat-sealable material (44) thereon. The metal end is crimp-seamed or double-seamed to the container body and the heat-sealable material(s) are heated to soften or melt such that the interface between the chuck wall and the side wall is fused. The interface is oriented along a direction relative to internal pressure exerted on the metal end such that stress on the interface caused by the internal pressure is predominantly shear stress.