EP0251778B1 - Procédé et dispositif pour l'élimination de l'eau d'une bande fibreuse dans une machine à papier - Google Patents

Procédé et dispositif pour l'élimination de l'eau d'une bande fibreuse dans une machine à papier Download PDF

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Publication number
EP0251778B1
EP0251778B1 EP87305818A EP87305818A EP0251778B1 EP 0251778 B1 EP0251778 B1 EP 0251778B1 EP 87305818 A EP87305818 A EP 87305818A EP 87305818 A EP87305818 A EP 87305818A EP 0251778 B1 EP0251778 B1 EP 0251778B1
Authority
EP
European Patent Office
Prior art keywords
dewatering
unit
web
wires
wire
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87305818A
Other languages
German (de)
English (en)
Other versions
EP0251778A1 (fr
Inventor
Taisto Nevalainen
Olavi Tolonen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Technologies Oy
Original Assignee
Valmet Karhula Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8522867&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0251778(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Valmet Karhula Inc filed Critical Valmet Karhula Inc
Priority to AT87305818T priority Critical patent/ATE63145T1/de
Publication of EP0251778A1 publication Critical patent/EP0251778A1/fr
Application granted granted Critical
Publication of EP0251778B1 publication Critical patent/EP0251778B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type

Definitions

  • the present invention relates to a method and apparatus applicable to paper machines for removing water from a fibrous web.
  • the method employs a so-called twin wire former (two endless, opposed mesh belts) where drainage is effected both upwards and downwards.
  • the method involves production of flows in the fibrous web, said flows being longitudinal with respect to the web and bringing the fibers into a turbulent state in the surface of the web. Said flows are caused by arranging the foils of the dewatering units to be adjustable in the direction of the web and by disposing them at least partly opposite to one another on different sides of the web.
  • DE-C-3138133 discloses different alternatives of arranging drainage at a twin wire former.
  • the only features common to the variations are that, in the dewatering zone, the web is wavy and the dewatering elements disposed both above and below the web are positioned alternately.
  • pressure on the web is effected by tension of wires.
  • This arrangement has the advantage of effecting pulses and heavy turbulence in the surface layer of the web, which prevents flocculation on the surface of the web, thus improving the web quality.
  • the dewatering units being adjustable with respect to each other in the direction of movement of the web ensure that in each case of web formation, it is possible to optimize the intensity of turbulence in the web surface, thus obtaining the best possible surface quality.
  • the web is pressed by adjusting the height of the lower dewatering unit, whereby the stresses on wires diminish when compared with for example the above- mentioned DE patent publication.
  • a method for removing water from a web in a paper machine from which water has already been removed on a horizontal dewatering part in which method the web is led in between two horizontal wires for compression and water is removed from the web through the wires and an intensive, adjustable turbulent flow field is generated in the web by means of rows of pressure elements of the dewatering units which are arranged on both sides of the wire level such that dewatering is effected by a dewatering unit on the upper side and an ad- justably displaceable dewatering unit on the lower side with both sides working together (known from DE-C-3138133) characterized in that the lower dewatering unit and its dewatering pressure elements are adjustable in relation to the upper unit by moving the lower unit in the direction of extension of the wire or by moving the lower unit perpendicularly to the level of the wires or by tilting the lower unit about an axis parallel with the level of the wire and transverse to the direction of the wires.
  • a dewatering apparatus of a twin wire former of a paper machine for removing water from a horizontal web entrained between two horizontal wires of the machine and wherein there are provided dewatering units both above and below the wires for entraining the web and each having rows of dewatering pressure elements, the upper dewatering unit being provided on the upper side of the entraining run of the upper wire, and the lower dewatering unit being provided on the lower side of the entraining run of the lower wire, with the lower unit being displaceable perpendicularly to the level of the wires (known from DE-C-3138133), characterised in that the lower dewatering unit has at least one substantially planar cover comprised of rows of dewatering pressure elements with said lower pressure elements being at least partially aligned with upper pressure elements in the opposite row ,and that the lower unit and pressure elements are adjustable together by displacement either in the direction the wires extend or by tilting about an axis parallel to the level of the wire and transverse to the direction of the wires.
  • the method and apparatus of the present invention are primarily intended to be applied to a fourdrinier machine 1 as shown in Fig. 1.
  • the wet end of the fourdrinier machine 1 comprises in its simplest form a headbox 2 and a fourdrinier wire section 3, said fourdrine:r wire section comprising wire 4, breast roll 5, other rolls 6 and dewatering elements 7.
  • the rear or downstream end of the fourdrinier wire section 3, i.e. a so-called web forming section 8, comprises an on-top unit 9 above the web and a dewatering unit 30 below the fourdrinier or the bottom or lower wire 4.
  • the on-top unit 9 includes, for example, a dewatering unit 20 and rolls 11, 12, 13 and 14, all of which, except for roll 13, are adjustable either vertically or, by means of a turning arm, in a swinging manner.
  • the upper dewatering unit 20 mainly comprises three chambers 21, 22 and 23, which have a side part or cover 25 composed of rows of constricting or pressure elements 24, said cover being common to all of said chambers.
  • the height of the slice opening of the first chamber 21 is adjustable. Water drained straight through top run of wire 10 without the help of dewatering elements above the wire is led to said chamber 21. All chambers of the dewatering unit 20 function as suction boxes the suction capacity of which is adjustable.
  • the dewatering unit 20 itself is adjustable both vertically and in longitudinally with respect to the machine.
  • the lower dewatering unit 30 comprises two covers 34 and 35 formed by pressure elements 32 and 33, said elements being united by a joint 31.
  • the covers 34 and 35 are supported by beams 36 which are transverse in view of the machine direction through pressure-medium filled hose-like elements 37 so as to enable the longitudinal adjustment of the angular position of the covers 34 and 35 with respect to the machine.
  • the pressure caused by the covers 34 and 35 on the bottom wire 4 can be changed.
  • the adjustability is ensured by the fact that the pressure adjustment of each hose-like pressure element 37 is independent of the other elements 37.
  • the covers 34 and 35 are supported by an element 38 adjustable longitudinally relative to the machine, said support element being attached to the machine frame at one end and to the cover 34 at its other end. Any other elements relating to the longitudinal adjustment are unnecessary because hose-like pressure elements 37 provide a sufficient adjusting allowance. If required, distances between various tables can be adjusted.
  • FIG. 3 illustrates a twin wire former where the shape and opposed location of consecutively arranged constricting or pressure dewatering elements 24 and 33 of the upper and lower dewatering units 20 and 30 match.
  • Fig. 4 illustrates a possible arrangement as shown in Fig. 4 in which the pressure elements 24 and 33 only partly match i.e. they are partly out of vertical alignment.
  • the distance between the covers 34 and 35 does not correspond to that between the dewatering elements 24 of the dewatering unit 20 above the web or to a multiple of said distance, in which case at least one of the covers 34 or 35 is disposed in accordance with Fig. 4.
  • Removal of water from a fibrous web in accordance with the invention is effected as shown in Fig. 5.
  • the pressure of the lower dewatering unit on the web through pressure elements 33 makes the wires 4 and 10 swell a little outwards from the web in between the pressure elements 33 and 24.
  • the pressure compresses the web between the opposite elements 24 and 33 so as to make water flow in the machine direction so that first, when entering the range of the rows, it flows opposite to the moving direction of the web whereas on the other edge of the rows it flows at an accelerated speed in the moving direction of the web.
  • Fig. 2 illustrates a two-part cover of the dewatering unit below the web, it is possible that there are several covers. The most substantial feature in the covers is that the pressure elements are secured to the covers and that the covers are substantially plane-like.

Landscapes

  • Paper (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Artificial Filaments (AREA)
  • Stringed Musical Instruments (AREA)
  • Seasonings (AREA)
  • Treatment Of Liquids With Adsorbents In General (AREA)

Claims (6)

1. Procédé pour l'élimination de l'eau d'une bande dans une machine à papier de laquelle l'eau a déjà été éliminée sur une partie d'épaississement horizontale, procédé selon lequel la bande est amenée entre deux toiles horizontales pour réaliser une compression et l'eau est éliminée de la bande au travers des toiles et un champ d'écoulement turbulent, intensif et réglable est engendré dans la bande à l'aide de rangées d'éléments de pression des unités d'épaississement qui sont disposées sur les deux côtés du niveau des toiles afin que l'élimination de l'eau soit effectuée par une unité d'épaississement sur le côté inférieur avec les deux côtés travaillant ensemble, caractérisé en ce que l'unité d'épaississement inférieure et ses éléments de pression d'élimination d'eau sont réglables par rapport à l'unité supérieure par déplacement de l'unité inférieure dans la direction de l'extension de la toile ou par déplacement de l'unité inférieure perpendiculairement au niveau des toiles ou par basculement de l'unité inférieure par rapport à un axe parallèle au niveau de la toile et transversal à la direction des toiles.
2. Dispositif d'épaississement d'un gabarit à double toile d'une machine à papier pour éliminer l'eau d'une bande horizontale entraînée entre deux toiles horizontales de la machine et dans lequel on a prévu des unités d'épaississement (20,30) à la fois au-dessus et au-dessous des toiles pour entrainer la bande et comportant chacune des rangées d'éléments de pression d'élimination d'eau (24 - 32 - 33), l'unité d'épaississement supérieure (20) étant prévue sur le côté supérieur du brin d'entraînement de la toile supérieure (10) et l'unité d'épaississement inférieure (30) étant prévue sur le côté inférieur du brin d'entraînement de la toile inférieure (4), avec l'unité inférieure (30) déplaçable perpendiculairement au niveau des toiles, caractérisé en ce que l'unité d'épaississement inférieure (30) possède au moins un couvercle sensiblement plan (34,35) composé des rangées des éléments de pression d'élimination d'eau (32,33), lesdits éléments de pression inférieure (32,33) étant au moins partiellement alignés sur les éléments de pression supérieurs (24) dans la rangée opposée et, en ce que l'unité inférieure (30) et les éléments de pression (24) sont réglables ensemble par déplacement soit dans la direction selon laquelle les toiles (4,10) s'étendent, soit par basculement par rapport à un axe parallèle au niveau de la toile et transversal à la direction des toiles (4,10)
3. Dispositif selon la revendication 2 caractérisé en ce que le couvercle (34-35) de l'unité d'épaississement inférieure (30) est constituée de deux parties au moins.
4. Dispositif selon les revendications 2 et 3 caractérisé en ce que la distance entre le dernier élément de pression (32) de la première partie du couvercle (34) d'une unité d'épaississement (30) et le premier élément de pression (33) de la seconde partie du couvercle (35) de la même unité d'épaississement (30) est inégale à la distance, ou à un multiple de cette distance, entre les éléments de pression (24) du couvercle (25) de l'unité d'épaississement opposée.
5. Dispositif selon les revendications 2 et 3, caractérisé en ce que la distance entre le dernier élément de pression de la première partie de couvercle (34) de l'unité d'épaississement inférieure (30) et le premier élément de pression de la seconde partie du couvercle (35) de cette même unité inférieure d'épaississsement est égale à la distance, ou à un multiple de cette distance, entre les éléments de pression (24) du couvercle (25) de l'unité d'épaississement supérieure opposée.
6. Dispositif selon les revendications 2 et 3, caractérisé en ce que la distance entre les parties du couvercle (34, 35) d'au moins une unité d'épaississement inférieure (30) est réglable.
EP87305818A 1986-07-02 1987-07-01 Procédé et dispositif pour l'élimination de l'eau d'une bande fibreuse dans une machine à papier Expired - Lifetime EP0251778B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87305818T ATE63145T1 (de) 1986-07-02 1987-07-01 Verfahren und vorrichtung zum entwaessern einer faserbahn in einer papiermaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI862808A FI862808A (fi) 1986-07-02 1986-07-02 Foerfarande och anordning foer avvattning av en fiberbana.
FI862808 1986-07-02

Publications (2)

Publication Number Publication Date
EP0251778A1 EP0251778A1 (fr) 1988-01-07
EP0251778B1 true EP0251778B1 (fr) 1991-05-02

Family

ID=8522867

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87305818A Expired - Lifetime EP0251778B1 (fr) 1986-07-02 1987-07-01 Procédé et dispositif pour l'élimination de l'eau d'une bande fibreuse dans une machine à papier

Country Status (8)

Country Link
EP (1) EP0251778B1 (fr)
JP (1) JPH01118690A (fr)
KR (1) KR900002102B1 (fr)
AT (1) ATE63145T1 (fr)
BR (1) BR8703365A (fr)
DE (1) DE3769710D1 (fr)
ES (1) ES2022356B3 (fr)
FI (1) FI862808A (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3815316C2 (de) * 1988-05-05 1996-02-01 Voith Sulzer Papiermasch Gmbh Vorrichtung zur Entwässerung an einem Doppelsieb-Former
WO1990005210A1 (fr) * 1988-10-31 1990-05-17 Beloit Corporation Appareil de formation
FI86652C (fi) * 1989-04-19 1992-09-25 Tampella Oy Ab Anordning i en pappersmaskin foer aostadkommande av avvattning pao oeversidan.
FI98540C (fi) * 1989-05-08 1997-07-10 Valmet Corp Laite paperi- tai kartonkirainan muodostamiseksi kuitumateriaalista
DE4002304A1 (de) * 1990-01-26 1991-08-14 Escher Wyss Gmbh Former in einer papiermaschine
DE4026953C2 (de) * 1990-01-26 1995-11-30 Escher Wyss Gmbh Entwässerungsvorrichtung und Verfahren zur Entwässerung an einem Doppelsiebformer
DE4037017C2 (de) * 1990-11-20 1994-12-08 Escher Wyss Gmbh Naßteil einer Doppelsieb-Papiermaschine
FI90673C (fi) * 1991-06-26 1994-03-10 Valmet Paper Machinery Inc Paperikoneen kaksiviirainen rainanmuodostusosa
DE4141607C2 (de) * 1991-12-17 1996-04-25 Voith Gmbh J M Doppelsiebformer
DE10327424A1 (de) * 2003-06-18 2005-02-10 Voith Paper Patent Gmbh Vorrichtung zur Verbesserung der Eigenschaften einer in einer Blattbildungsvorrichtung hergestellten Faserstoffbahn
AT502805B1 (de) * 2006-01-05 2007-06-15 Andritz Ag Maschf Verfahren und vorrichtung zur entwässerung einer faserstoffbahn

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3215594A (en) * 1962-10-08 1965-11-02 Black Clawson Co Paper forming apparatus
JPS5122521A (ja) * 1974-08-15 1976-02-23 Kubota Ltd Sehisochitsukitaueki
JPS612718Y2 (fr) * 1981-03-28 1986-01-28
JPS6170091A (ja) * 1984-09-12 1986-04-10 三菱重工業株式会社 紙原料の均一分散装置
JPS6175898A (ja) * 1984-09-19 1986-04-18 三菱重工業株式会社 紙層形成装置
JPS6189398A (ja) * 1984-10-03 1986-05-07 三菱重工業株式会社 紙層形成装置
JPS61119796A (ja) * 1984-11-16 1986-06-06 三菱重工業株式会社 紙層形成装置

Also Published As

Publication number Publication date
ES2022356B3 (es) 1991-12-01
JPH0444038B2 (fr) 1992-07-20
DE3769710D1 (de) 1991-06-06
JPH01118690A (ja) 1989-05-11
FI862808A (fi) 1988-01-03
KR900002102B1 (ko) 1990-04-02
ATE63145T1 (de) 1991-05-15
FI862808A0 (fi) 1986-07-02
BR8703365A (pt) 1988-03-15
KR880001887A (ko) 1988-04-27
EP0251778A1 (fr) 1988-01-07

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