Twin wire press and method for dewatering a fibre suspension

A suspension and press technology, applied in the press section, paper machine, paper machine wet end, etc., can solve the problems of damaged fiber paper web, white water cannot be removed, high friction, etc., to reduce friction load, quantity and size reduction , the effect of high dry matter content

Inactive Publication Date: 2011-05-04
METSO PAPER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Too high a load on the dewatering table directly leads to high friction and very high energy consumption
Going from relatively slow dewatering in the dewatering table to very fast dewatering in the roller unit is a non-negligible step which sometimes causes problems in the first nip of the roller unit
When the fibrous web leaves the dewatering table with too low a pulp consistency, it enters and deforms in the first nip of the roll arrangement at too high a speed, thus damaging the fibrous web
[0005] The first nip immediately after the dewatering table has an additional disadvantage: a relatively high flow of white water is generated, which cannot be completely removed from the fibrous web

Method used

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  • Twin wire press and method for dewatering a fibre suspension
  • Twin wire press and method for dewatering a fibre suspension
  • Twin wire press and method for dewatering a fibre suspension

Examples

Experimental program
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Embodiment Construction

[0034] figure 2 A twin wire press 2 with a roll arrangement 4 is shown according to an embodiment of the invention. The roller arrangement 4 has an inlet section 6 . Figure 1A - B shows a partial view and an enlarged view of the inlet section 6 in the roll arrangement 4 of the twin wire press 2 according to an embodiment of the invention. The twin wire press 2 comprises a continuous lower wire 8 and a continuous upper wire 10, both of which define an elongated dewatering space 12 in which the fiber suspension is dewatered during the movement of the wires 8, 10. The twin wire press comprises a headbox 14 and two dewatering tables 16, 18 for supplying the fiber suspension to the dewatering space 12 at the inlet end of the dewatering space, the two dewatering tables respectively supporting the upper and lower network. A fibrous web F is formed between the two wires. Viewed from the direction of wire movement, a roll arrangement 4 is arranged after the dewatering tables 16, 1...

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PUM

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Abstract

The invention relates to a twin wire press (2) for dewatering a fibre suspension, comprising a lower wire (8) and an upper wire (10) between which a fibre web (F) is formed. An arrangement of rolls (4) comprises a first dewatering control means (22) having a dewatering element (24) forming a press nip (25) with a first roll (26) (or a second dewatering control means), where the element and the first roll, (or alternative second control means), along a section of the press nip where they bear on each other, are adapted to each other to provide a thickness profile designed to provide a dewatering profile, and where the element presses the formed web (F) against the first roll, or the alternative second control means, via the wires, whereby water pressed from the web is drained through the element. The invention also concerns a method for dewatering a fibre suspension.

Description

technical field [0001] The invention relates to a twin wire press and to a method for dewatering a fiber suspension in a twin wire press. Background technique [0002] Twin wire presses for dewatering a fibrous suspension and forming a continuous fibrous web are known. The pulp is typically dewatered from an inlet consistency of 3-8% by weight to an outlet consistency of 30-50% by weight. Such a twin wire press known in the prior art comprises a lower roll, a continuous lower wire running as a web around said lower roll, an upper roll, and a continuous wire running as a web around said upper roll. The two wires interact along the dewatering section of the web where they form wedge-shaped spaces for the fiber suspension. As the two wires move along said dewatering section, the two wires thus continuously press the fiber suspension in the wedge-shaped dewatering space, whereby the fiber suspension is initially pressed and dewatered and a cohesive fibrous web is formed betwee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21F1/80D21F2/00D21F3/06
CPCD21F1/80D21F3/02D21F3/06D21F7/06D21F9/003
Inventor L·奥德马克H·洛夫格兰
Owner METSO PAPER INC
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