D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
D21F 1/10 (2006.01) D21F 1/48 (2006.01) D21F 9/00 (2006.01)
Patent
CA 2157205
A twin-wire former of a paper machine, for high speed paper machines whose web running speed is of an order of from about 1600 m/min to about 2500 m/min. The former includes a carrying wire guided in a loop and a covering wire guided in a loop to define a twin-wire zone and an inlet or forming gap between the wires. A pulp suspension layer or a pulp suspension jet is fed into the inlet or forming gap through a discharge duct of a headbox. The former also includes, as a combination, a first forming-suction roll arranged proximate the forming gap in a loop of one of the wires and a second forming-suction roll arranged inside the loop of the wire opposite to the wire inside whose loop the first forming roll is arranged. The forming-suction rolls have suction zones over which the twin-wire zone is curved on certain sectors. In the suction zones, the vacuum levels are arranged adjustable independently from one another, and possibly relative to one another, so as to minimize the unequalsidedness of the web. After the second forming-suction roll, there is a pressure pulsation unit in the twin-wire zone.
Sim & Mcburney
Valmet Corporation
LandOfFree
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