D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
D21F 5/04 (2006.01) D21G 7/00 (2006.01)
Patent
CA 2136901
The invention concerns a method and a device in the drying of a paper web (W), wherein, after the press section (20) of the paper machine, the paper web (W) is dried in a number of successive groups (R1...R N;R S) with single-wire draw, in which groups the contact-dry- ing cylinders (10) are placed in the upper row and the reversing suction cylinders (11) or the equivalent suction rolls in the lower row or in equivalent diagonal or vertical rows. From the side of its lower face, across the entire length of the dryer section, the paper web (W) is dried by means of contact-drying cylinders (10). The paper web (W) is passed as a closed draw from one group (R1...R N; R S) with single-wire draw to the next group, and the paper web (W) is guided, while it is placed on the drying wire (15) at the side of the outside curve, by means of the reversing suction cylinders (11) with a curve radius D2/2, which is chosen in the range of D2/2 = 250...1000 mm. The paper web (W) is kept in constant contact with the drying wire (15), as it is placed at the side of the outside curve, against the effect of centrifugal forces by means of a difference in pressure, which difference in pressure is preferably extended over the entire inner circumference of said reversing suction cylinders (11). In addition to the above, or as an alternative, the paper web (W) is dried from the side of its upper face on a draw (W1) or draws of the paper web (W) that is/are free from the wire (15) and/or a flow of drying air is applied to the upper face of the paper web (W) through the drying wire (15) and/or on said draws (W1) of the paper web (W) that are free from the wire (15).
Kaihovirta Juha
Kerttula Reima
Yli-Kauppila Jouko
Sim & Mcburney
Valmet Corporation
LandOfFree
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