Process and device for dewatering a fiber web
AssigneeAndritz Inc.
InventorsJorg Baubock, Paul Arnold
Life of this patent
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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.
Claims25
In a process for dewatering a fiber web, by applying a vacuum to each unit area of the web, the improvement comprising that the vacuum applied to each unit area of the web is pulsed between a maximum value and a minimum value.
A device for vacuum dewatering a fiber web moving in a machine direction, wherein the improvement comprises at least one suction box that applies a pulsating vacuum between a maximum value (V) and a minimum value to the fiber web.
Dependencies are inferred from the claim text.