Device for sealing a cooling tank for an extruded plastic profile

A device for sealing an extruded plastics material profile in at least one of an inlet region and an outlet region of a tank and disposed at an end face of the tank, the device comprising:

• a rigid element;
• a closed annular cross section formed of a resilient material and including a cavity, wherein an outer peripheral shape of the annular cross section is disposed against the rigid element, wherein the annular cross section is alterable by applying a vacuum to the cavity and wherein the annular cross section is configured to be applied to an outside of the plastics material profile;
• and
• a stretching device disposed against the rigid element and configured to stretch the resilient material along an extrusion axis during an alteration of the annular cross section, the stretching device comprising a plurality of guide rods, each guide rod including a spring coiled around the guide rod so as to tension each of the plurality of guide rods.