The present invention relates to a vacuum ring (1) for removing air from a stack sequence (2), the vacuum ring at least comprising a flexible hose (3), which is stable under pressure and can be connected to a vacuum pump (8). The hose is in the form of a closed ring and has an opening (4) to the interior (I) so that the ring can accommodate an exterior side edge (5) of a stack sequence (2) in order to form an air removal channel (6) along the side edge (5), wherein the vacuum ring (1) has at least one electric heating element (7).