Method and device for ensuring the run of the web in the multi-cylinder dryer of a papermachine
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United States of America Patent
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Oct 1, 1996
Grant Date -
N/A
app pub date -
Oct 18, 1994
filing date -
Feb 19, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
The multi-cylinder dryer of a papermachine comprises a first tier of cylinders, wherein a web travels supported by a first dryer wire on the cylinders of the first tier of cylinders, as well as a second tier of cylinders, wherein the web travels supported by a second dryer wire on the cylinders of the second tier of cylinders. Upon passing around its wire guide roll, each dryer wire forms a loop having at least one section, along which the first or second wire, respectively, is free from the web and which in this wire traveling direction is immediately upstream of a point, at which the first or second wire is received on the first or second guide roll. Along a wire section between a cylinder and the guide roll, a nozzle inside the respective wire loop is used blowing air through the free section of dryer wire into a pocket between it and a cylinder of the opposite tier of cylinders for ventilating the pocket through a plenum zone formed between an air guiding surface located inside the respective wire loop downstream of the nozzle in the wire traveling direction, and the free section.
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