Roller for a paper/cardboard production/finishing machine, for water extraction or as a web guide roller, has elongated passage openings in the roller mantle for suction/blowing air flows

摘要

The roller (1) for a web (8) production/finishing machine, of paper or cardboard, has a rotating mantle (2) with a number of passage openings (3) for suction or blowing air flows from a chamber (7) linked to an underpressure/overpressure supply (6). The passage openings are elongated holes, aligned generally along the direction (L) of web travel.