Abstract 1. Improvement in a two-wire former in a paper machine, comprising in combination, a web-carrying wire and a covering wire; two rolls with foraminous mantle surfaces within the loop of said carrying wire, wherein the one which is first in the direction of travel of the web is a web-forming roll and the second is a couch roll; dewatering compartments within the mantle of said rolls, at least one in each; said carrying wire and covering wire running along a common curved path starting at said web-forming roll and up to said couch roll, this path forming a convex part of the loop of said carrying wire, the course of said curved path being determined by the positions of at least one wire-guiding means and furthermore at least one dewatering means placed within the loop of said web-forming roll each over its individual first and second wire-guiding roll to thereafter form a throat therebetween, means for adjusting the position of each of said first and second wire-guiding rolls; furthermore a headbox, which supplies pulp into said throat; the whole combination being such that the bulk of the dewatering of the web takes place at said web-forming roll on the sector, having a size of 90 to 150 degrees of arc, lapped by said wires, primarily by effect of the pressure developed in the pulp suspension between said wires the expressed water being removed on effect of the centrifugal force outwards and partly in the opposite direction into said web-forming roll.
Inventors
👤 M Kankaanpaa
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-27 11:24
CPC Classifications
D; D21; D21F; D21F9/00; D21F9/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
249 words
Improvement in a two-wire former in a paper machine, comprising in combination, a web-carrying wire and a covering wire; two rolls with foraminous mantle surfaces within the loop of said carrying wire, wherein the one which is first in the direction of travel of the web is a web-forming roll and the second is a couch roll; dewatering compartments within the mantle of said rolls, at least one in each; said carrying wire and covering wire running along a common curved path starting at said web-forming roll and up to said couch roll, this path forming a convex part of the loop of said carrying wire, the course of said curved path being determined by the positions of at least one wire-guiding means and furthermore at least one dewatering means placed within the loop of said web-forming roll each over its individual first and second wire-guiding roll to thereafter form a throat therebetween, means for adjusting the position of each of said first and second wire-guiding rolls; furthermore a headbox, which supplies pulp into said throat; the whole combination being such that the bulk of the dewatering of the web takes place at said web-forming roll on the sector, having a size of 90 to 150 degrees of arc, lapped by said wires, primarily by effect of the pressure developed in the pulp suspension between said wires the expressed water being removed on effect of the centrifugal force outwards and partly in the opposite direction into said web-forming roll.
Claim 2
Dependent Claim
249 words
Improvement in a two-wire former in a paper machine, comprising in combination, a web-carrying wire and a covering wire; two rolls with foraminous mantle surfaces within the loop of said carrying wire, wherein the one which is first in the direction of travel of the web is a web-forming roll and the second is a couch roll; dewatering compartments within the mantle of said rolls, at least one in each; said carrying wire and covering wire running along a common curved path starting at said web-forming roll and up to said couch roll, this path forming a convex part of the loop of said carrying wire, the course of said curved path being determined by the positions of at least one wire-guiding means and furthermore at least one dewatering means placed within the loop of said web-forming roll each over its individual first and second wire-guiding roll to thereafter form a throat therebetween, means for adjusting the position of each of said first and second wire-guiding rolls; furthermore a headbox, which supplies pulp into said throat; the whole combination being such that the bulk of the dewatering of the web takes place at said web-forming roll on the sector, having a size of 90 to 150 degrees of arc, lapped by said wires, primarily by effect of the pressure developed in the pulp suspension between said wires the expressed water being removed on effect of the centrifugal force outwards and partly in the opposite direction into said web-forming roll.