Flexibly mounted sealing strips of a vacuum roll for a web dryer

摘要

In a papermaking machine, the drying section includes a vacuum based system which serves to guide the web and supporting felt (15) from a first drying cylinder (11) to a transfer vacuum roller (10), which has perforations (13) through which a vacuum is communicated into the interior of the roller 10 from of an external suction box (14). The suction box (14) includes lengthwise extending sealing strips (28, 29) located adjacent and bounding the free circumferential surface of the transfer roller (10), which is not overlapped by the felt of the drying section. The sealing strips extend from the suction box 14 to the roller mantel (10a) of the roller 10. These strips are further designed in the style of a doctor blade and are flexibly mounted on the suction box (14) so that they are flexible and biased against the roller 10 by spring action. They extend approximately tangentially to the surface of the roller mantel (10a), contacting it gently.