D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
D21F 5/04 (2006.01) D21G 9/00 (2006.01)
Patent
CA 2118307
The multi-cylinder dryer of a paperma- chine comprises a first tier of cylinders, wherein a web (W) travels supported by a first dryer wire (k1) on the cylinders (1) of the tier of cylinders, as well as a second tier of cylinders, wherein the web (W) travels supported by a second dryer wire (k2) on the cylinders (2) of the tier of cylin- ders. Upon passing around its wire guide roll (h1;h2), each dryer wire (k1,k2) forms a loop having at least one section (c - d), along which said wire (k1;k2) is free from the run of the web (W) and which in the wire traveling direction is immediately upstream of a point (d), at which the wire is received on the guide roll (h1;h2). Along a wire section (a - d) between a cylinder (1; 2) and the guide roll, a nozzle (s2) inside the wire loop is used blowing air through said free section (c - d) of dryer wire (k1; k2) into a pocket (t2,1; t1,2) between it and a cylinder (2;1) of the opposite tier of cylinders for venti- lating said pocket through a plenum zone (p1+, n+) formed between an air guiding surface (op) located inside the wire loop downstream of the nozzle (s2) in the wire traveling direction, and said free section (c - d).
Borden Ladner Gervais Llp
Valmet Paper Machinery Inc.
LandOfFree
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