A spray retort system includes a vessel having an interior and a load defined by at least one paperboard container. The at least one paperboard container comprises a body having a top end, a bottom end, and an exposed edge, and the load is positionable within the interior of the vessel. The system further includes at least one nozzle positioned within a top interior portion of the vessel to spray processing fluid onto a top of the load and a first supplemental nozzle arranged on the top interior portion of the vessel to spray processing fluid downwardly along the exposed edge of the at least one paperboard container.
