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Forming section

A forming section and forming shoe technology, which is applied in the wet section of paper machines, textiles, papermaking, paper machines, etc., can solve the problems of high cost of negative pressure system and high energy consumption of negative pressure system operation, and achieve less splashing and excellent quality and intensity characteristics, flexible and variable effects

Active Publication Date: 2011-09-21
METSO PAPER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, building a negative pressure system is expensive, and the operation of the negative pressure system consumes a lot of energy

Method used

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Examples

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Embodiment Construction

[0025] figure 1 A schematic side view of a forming part according to the invention is shown.

[0026] The forming section comprises a first wire loop 11 looped around a forming roll 12a and a second wire loop 21 looped around a first guide roll 22a. The direction of travel of the first web 11 is indicated by arrow S1 and the direction of travel of the second web 21 is indicated by arrow S2. The first wire 11 and the second wire 21 form a meeting gap G so that the wires 11, 21 meet in the area of ​​the forming roll 12a. The headbox 30 feeds a jet of pulp suspension into this gap G between the wires 11 , 21 . After passing the meeting point, the wires 11, 21 travel in a specific section on the outer surface of the forming roll 12a on which a first dewatering zone Z1 formed by a curve is formed. Following this first dewatering zone Z1 formed by a curve is an essentially straight twin-wire section with two dewatering zones Z2, Z3 thereon. The second dehydration zone Z2 is form...

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Abstract

The forming section comprises two wire loops (11, 21) which form a twin- wire zone which comprises a dewatering element (40) performing initial dewatering and a dewatering device (100b) following it. The dewatering device (100b) comprises a stationary support shaft (110) on which are supported support elements (111, 112, 113, 114) around which circles an impermeable belt loop (120). The dewatering device (100b) further comprises a curvilinear dewatering zone (Z30) over which the wires (11, 21) travel supported by the belt loop (120). The degree of curvature of the curve of the curvilinear dewatering zone (Z30) increases in the travel direction of the belt (120) such that increasing dewatering pressure is applied to pulp suspension travelling between the wires (11, 21) on the curvilinear dewatering zone (Z30).

Description

technical field [0001] The invention relates to a forming section according to the preamble of claim 1 . Background technique [0002] In this specification, a fiber web machine means a paper machine, a board machine, a tissue machine and a pulp dryer. [0003] The function of the forming section is to remove water from the fiber suspension supplied by the headbox. The fiber suspension fed to the forming section typically has a consistency of 1% and the web formed on the forming section after passing through the forming section has a consistency of 18% to 20%. [0004] When the web is made from an aqueous lignocellulosic slurry, the water in the pulp is removed on the forming section by passing through one or more forming wires to initiate the forming of the web. The wood pulp fibers remain in a random distribution on the forming wire or between multiple forming wires moving together. [0005] Depending on the grade of web produced, different types of size are used. The ...

Claims

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Application Information

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IPC IPC(8): D21F1/48D21F9/00
CPCD21F7/005D21F9/003D21F1/36D21F1/48
Inventor 安蒂·波伊科莱宁
Owner METSO PAPER INC
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