Abstract: A process and a device for dewatering a fiber web 3, especially a paper web, using vacuum. The vacuum seen by a given unit are of the web is pulsed between a maximum value V and a minimum value. At least one suction box 7 is provided with perforations beneath the running web where the vacuum is applied with a pulsating effect on the web.

Abstract: A device for drying a paper web has a drying drum mounted at least partially inside a housing, whereby the cylinder wall of the drying drum is provided with a large number of apertures or openings so that hot air can flow through the cylinder wall, a heating device to generate hot air, a feed device to apply the hot air to the paper web, and a device to carry off the air containing moisture. In order to permit a compact design, the housing surrounds at least one hood which partly encloses a cylinder wall of the drying drum with the heating device being located inside the hood. Both the feed device and the heating device should be located preferably inside the hood.

Abstract: The invention relates to a process for reducing dust deposits on the drying hood of a paper machine. It is primarily characterized by additional fresh air being blown over the upper side of the paper machine drying hood. The invention also relates to a device for reducing dust deposits on the drying hood of a paper machines, characterized by at least one slit for blowing our air being provided on the top side of the paper machine drying hood.