Abstract: The invention relates to a suction or ventilation roll of a machine for producing and/or finishing a paper, cardboard, tissue or other fibrous material web (2). Said roll comprises a rotatable, perforated roll jacket (1) and at least one pressure zone (9), which only extends over part of the roll circumference and is formed by a fixed pressure compartment (6) located in the interior of the roll and open towards the roll jacket (1). The pressure compartment (6) is connected to a negative- or excess-pressure source and is sealed in relation to the roll jacket (1) by means of at least one sealing element (7). One aim of the invention is to reduce the noise emissions. To achieve this, a substantially air-tight cover (5), which runs in the direction of the circumference and is located outside the pressure compartment (6), adjoins a sealing element (7), said cover making contact with the roll jacket (1), or being placed at a distance of less than 100 mm to the latter.

Abstract: The invention relates to a suction or blowing cylinder of a machine which is used to produce and/or shape paper, cardboard, tissue or another fibrous material (2). Said cylinder comprises a rotatable, perforated cylinder covering (1) and at least one pressure area (4) which is connected to a lower pressure source or a high pressure source and is sealed in relation to the cylinder covering (1) with the aid of at least one sealing element (5, 6). The invention is characterised in that the sealing element (5, 6) is embodied in a flat-shaped manner and is arranged in the vicinity of the inner wall of the cylinder covering (1).