D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
D21F 5/04 (2006.01)
Patent
CA 2133604
(57) Abstract Method and dryer section in contact drying of a paper web (W). The paper web (W) is dried by means of heated smooth-faced drying cylinders (10, 20A,20B) by using a number of successive so called normal groups (R1...RN) with single-wire draw, in which the drying cylinders (10) are placed in the upper row and the reversing suction cylinders (11) in the lower row. After the press section of the paper machine, the paper web (W) is dried initially in a number of successive groups (R1...RN) with single-wire draw by pressing the paper web (W) by means of the drying wire (15) of the cylinder group against the heated faces of the drying cylinders (10) and by, in each group (R1...RN) with single-wire draw, passing the paper web (W) on support of the same drying wire (15) from one drying cylinder (10) onto the other drying cylinder over reversing suction cylinders (11) or rolls. By means of the groups (R1...RN) with single-wire draw, the paper web (W) is dried to a dry solids content of k1 = 70...92 %. After the drying steps which were carried out exclusively by means of normal groups (R1...RN) with single-wire draw, the paper web (W) is dried immediately further by means of one single group (RTW) with twin-wire draw to its ultimate dry solids content.
Kerttula Reima
Yli-Kauppila Jouko
Sim & Mcburney
Valmet Paper Machinery Inc.
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