US 5,635,032 AGranted

Double wire former

AssigneeSulzer-Escher Wyss GmbH

InventorsAlfred Bubik, Hans Dahl, Josef Dom, Karl Muller, Heinz Steckenreuter, Elmer Weisshuhn

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Abstract

In a double wire former of a paper machine, a first continuous wire (1) is fed onto an at least partially curved guiding surface (4) so as to converge with a second wire (2), wherein the guiding surface (4) is movable in a form-locked manner relative to the wires. After the dewatering section described above, a further guiding surface (7) follows which, in advantageous embodiments, has an opposite sense of curvature and is fixedly located.

Claims13

Dependent claims

Double wire former comprising a first wire (1) and a second wire (2), wherein a suspension layer (3) is formed on the first wire (1) and wherein the first wire (1) together with the suspension layer (3) is fed into a sheet forming section formed by a first guiding surface (4) which is at least partially curved in the wire running direction, said double wire former further comprising a support for resiliently supporting said first guiding surface at an angle with respect to said suspension layer;

in said sheet forming section, the second wire (2) is brought into contact with the suspension layer (3) located on the first wire (1) and wherein a second guiding surface (7) for the second wire (2) through which water passing through can be sucked off is provided on the side of the second wire (2), lying opposite to the suspension layer, wherein in said sheet forming section said support resiliently supports said first guiding surface (4) against said first wire (1) and said second wire (2) so that said first guiding surface (4) can yield to forces exerted on said first and second wires (1, 2) by said suspension layer (3) in a direction substantially transverse to said suspension layer (3), said support being configured against said first guiding surface such that said angle between said first guiding surface and said suspension layer is maintained substantially the same when said first guiding surface yields to forces exerted on said first and second wires;
wherein said second guiding surface is constructed as a suction box (6) formed by members which extend substantially transverse to said suspension layer and wherein a first closed member, as seen in the running direction, forms the beginning of said second guiding surface (7) at the suction box (6) and has a curvature with a direction which is opposed to said first guiding surface (4);
wherein said first closed member, as seen in the running direction, is at least twice as long as the members of the suction box following said first closed member.

Dependencies are inferred from the claim text.

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Abstract

in said sheet forming section, the second wire (2) is brought into contact with the suspension layer (3) located on the first wire (1) and wherein a second guiding surface (7) for the second wire (2) through which water passing through can be sucked off is provided on the side of the second wire (2), lying opposite to the suspension layer, wherein in said sheet forming section said support resiliently supports said first guiding surface (4) against said first wire (1) and said second wire (2) so that said first guiding surface (4) can yield to forces exerted on said first and second wires (1, 2) by said suspension layer (3) in a direction substantially transverse to said suspension layer (3), said support being configured against said first guiding surface such that said angle between said first guiding surface and said suspension layer is maintained substantially the same when said first guiding surface yields to forces exerted on said first and second wires;
wherein said second guiding surface is constructed as a suction box (6) formed by members which extend substantially transverse to said suspension layer and wherein a first closed member, as seen in the running direction, forms the beginning of said second guiding surface (7) at the suction box (6) and has a curvature with a direction which is opposed to said first guiding surface (4);
wherein said first closed member, as seen in the running direction, is at least twice as long as the members of the suction box following said first closed member.