A system in a drying section of a web forming machine for guiding a screen, and of the further of the web with cylindrical guide members

摘要

A system in a drying section of a web forming machine for guiding a screen (12) and of the other of the web (14) with cylindrical guide members (16), wherein at least one of the cylindrical guide members (16) through the web (14), the through the screen (12) is supported in a size of less than 90° is covered, characterized in that at least one guide roller (16) by the web (14) in a size of less than 90° is covered, a roller provided with grooves (22), and in the transverse direction of the web forming machine, the provided with grooves roller (22) adjacent grooves (24), said grooves (24) are separate vacuum zones over the area by the web (14) is covered, and the roller provided with grooves (22) as such is adapted to produce a reduced pressure.