| 主权项 |
1. A package comprising
a vessel including a bottom panel, a side panel arranged to extend upwardly from the bottom panel and cooperate with the bottom panel to form a product-storage region, the side panel being formed to include at least one window that extends through the side panel and opens into the product-storage region, and a brim coupled to the side panel and arranged to border an opening into the product-storage region, an exterior casing made of an expansible elastic material and configured to include a sleeve arranged to surround and mate with an exterior surface of the side panel of the vessel and to cover the at least one window, and a lid adapted to mate with the brim of the vessel to close the opening into the product-storage region to form a retortable package and establish a variable-volume interior chamber therein, wherein the sleeve of the exterior casing is made of an elastic deformable material is configured to provide means for yielding elastically during exposure of an inner surface of the sleeve to an elevated pressure in excess of a predetermined retort pressure that is extant in the variable-volume interior chamber when the lid is sealed hermetically to the brim of the vessel to cause shape-changing movement of the sleeve from a selected pre-expansion shape in a direction away from the product-storage region of the vessel and a vertical central axis of the vessel to an outwardly extending inflated shape to cause the variable-volume interior chamber to increase in volume without any discharge of fluid from the variable-volume interior chamber to surroundings outside of the variable-volume interior chamber and then contracting to assume a contracted shape in response to cooling of the variable-volume interior chamber. |
