D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
D21F 1/80 (2006.01) D21F 1/10 (2006.01) D21F 9/00 (2006.01)
Patent
CA 2123820
ABSTRACT A gap former for a paper machine having a twin-wire zone including a combination of the following web-forming and dewatering units in the given sequence in the running direction of the web (W) that is formed: (a) a forming gap defined at one side by one of the wires which runs over an open face of a first forming roll, and at an opposite side by the substantially straight run of the opposite wire starting from a guide roll to the next forming member; (b) a forming shoe having a curved ribbed deck whose curve radius is from about 2 m to about 8 m, the tangential direction of the inlet side of the ribbed deck of the forming shoe substantially coincides with the principal direction of the forming gap; (c) at least one MB unit including a dewatering unit and a press and support unit placed one opposite to the other, sets of ribs in the dewatering and press and support units pressing the web being formed between the wires; and (d) a large-diameter second forming roll which includes suction zones, the covering wire is separated by means of the guide roll from the web in or after the area of the suction zones and the web is passed further on the carrying wire to the press section.
Ilvespaa Heikki
Jaakkola Jyrki
Linsuri Ari
Partanen Erkki
Verkasalo Lauri
Metso Paper Inc.
Sim & Mcburney
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