Double wire section in a paper machine

Details Double wire section in a paper machine Double wire section in a paper machine

D - Textiles, Paper

21

F

92/14.1

D21F 1/00 (2006.01) D21F 9/00 (2006.01)

Patent

CA 1042695

ABSTRACT OF THE DISCLOSURE The present invention concerns in a paper machine, a wire section in which the stock is supplied from a head-box into the space between two wires and which comprises a lower wire forming an enclosed loop and an upper wire forming an enclosed loop, and the course of said lower wire being defined under guidance by a plurality of rolls and of means influencing the dewatering action so that on the stretch following immediately after the headbox and supported by foil-type or strip-like dewatering means the path of the lower wire is substantially hori- zontal, and so that after said horizontal stretch the path of the lower wire turns downwardly, guided by at least one dewatering means having an arced surface, and said upper wire running guided by a plurality of rolls and of means influencing the dewatering action so that its path is common with that of the lower wire opposite said arced surface dewatering means and on the subsequent lower wire stretch up to the next wire-guiding roll. Part of said wire guiding rolls and/or dewatering means have been provided with supporting means and action means by the aid of which the path of the upper wire and/or the lower wire can be changed so that the paths of the upper wire and lower wire coincide on that stretch, supported by foil-type dewatering means, of the lower wire which precedes the arced surface dewatering means lying within the lower wire loop,said coinciding upper and lower wire paths from said arced surface onwards thus providing a permanent twin wire operation while that part of said double wire section preceding said arced surface can be adjusted to provide optionally a single wire operation or a twin wire operation.

231722

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