EP0251778B1 - Verfahren und Vorrichtung zum Entwässern einer Faserbahn in einer Papiermaschine - Google Patents

Verfahren und Vorrichtung zum Entwässern einer Faserbahn in einer Papiermaschine 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
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English (en)
French (fr)
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EP0251778A1 (de
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
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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/de
Application granted granted Critical
Publication of EP0251778B1 publication Critical patent/EP0251778B1/de
Anticipated expiration legal-status Critical
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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.

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  • 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. Ein Verfahren zur Entfernung von Wasser von einer Bahn in einer Papiermaschine, von der in einem horizontalen Entwässerungsteil Wasser bereits entfernt wurde, in besagtem Verfahren die Bahn zur Kompression zwischen zwei horizontalen Sieben (Siebbändern) geführt und Wasser aus der Bahn durch die Siebe entfernt wird, und ein intensives einstellbares turbulentes Strömungsfeld in der Bahn mit Hilfe von Reihen von Druckelementen der Entwässerungseinheiten erzeugt wird, die auf beiden Seiten des Siebniveaus angeordnet sind, so daß die Entwässerung durch eine Entwässerungseinheit an der Oberseite und eine einstellbar verschiebbare Entwässerungseinheit an der Unterseite bewirkt wird, wobei beide Seiten zusammenwirken,
dadurch gekennzeichnet, daß die untere Entwässerungseinheit und ihre Entwässerungs-Druckelemente in Bezug auf die obere Einheit einstellbar sind, indem die untere Einheit in Richtung der Siebausdehnung oder senkrecht zu der Ebene der Siebe oder durch Kippung um eine Achse parallel zum Siebniveau und quer zur Richtung der Siebe bewegt wird.
2. Eine Entwässerungsvorrichtung eines Zweisiebformers einer Papiermaschine zur Entfernung von Wasser von einer horizontalen Bahn, die zwischen zwei horizontalen Sieben (Siebbändern) der Maschine geführt wird, und die mit Entwässerungseinheiten (20,30) sowohl über und unter den Sieben versehen ist, welche die Bahn führen und je Reihen von Entwäserungsdruckelementen (24,32,33) haben, wobei die obere Entwässerungseinheit (20) an der Oberseite des geführten Laufs des oberen Siebes (10),und die untere Entwässerungseinheit (30) an der Unterseite des geführten Laufs des unteren Siebes (4) vorgesehen ist, und die untere Einheit (30) senkrecht zum Niveau der Siebe verschiebbar ist,
dadurch gekennzeichnet, daß die untere Entwässerungseinheit (30) wengistens eine im wesentlichen ebene Abdeckung (34,35) hat, die aus Reihen von Entwässerungsdruckelementen (32,33) besteht, wobei die besagten unteren Druckelemente (32,33) wenigstens teilweise nach oberen Druckelementen (24) der gegenüberliegenden Reihe ausgerichtet sind, und daß die untere Einheit (30) und die Druckelemente (32, 33) zusammen einstellbar sind, durch Verschiebung entweder in Richtung der Siebausdehnung (4,10) oder durch Kippung um eine Achse parallel zum Siebniveau und quer zur Richtung der Siebe (4,10).
3. Eine Vorrichtung nach Anspruch 2,
dadurch gekennzeichnet, daß die Abdeckung (34,35) der unteren Entwässerungseinheit (30) wenigstens aus zwei Teilen besteht.
4. Eine Vorrichtung nach Anspruch 2 oder 3,
dadurch gekennzeichnet, daß der Abstand zwischen dem letzten Druckelement (32) des ersten Abdeckteils (34) einer Entwässerungs- einheit (30) und dem ersten Druckelement (33) des zweiten Abdeckteils (35) derselben Entwässerungseinheit (30) ungleich zu der Entfernung, oder einem Vielfachen davon, ist, die zwischen den Druckelementen (24) der Abdekkung (25) der gegenüberliegenden Entwässerungseinheit besteht.
5. Eine Vorrichtung nach Anspruch 2 oder 3,
dadurch gekennzeichnet, daß der Abstand zwischen dem letzten Druckelement des ersten Abdeckteils (34) der unteren Entwässerungs- einheit (30) und dem ersten Druckelement der zweiten Abdeckung (35) derselben unteren Entwässerungseinheit gleich ist der Entfernung oder einem Vielfachen davon, die zwischen den Druckelementen (24) der Abdeckung (25) der gegenüberliegenden oberen Entwässerungs-einheit besteht.
6. Eine Vorrichtung nach Anspruch 2 oder 3,
dadurch gekennzeichnet, daß der Abstand zwischen den Abdeckteilen (34,35) wenigstens der unteren Entwässerungseinheit (30) einstellbar ist.
EP87305818A 1986-07-02 1987-07-01 Verfahren und Vorrichtung zum Entwässern einer Faserbahn in einer Papiermaschine Expired - Lifetime EP0251778B1 (de)

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
FI862808 1986-07-02
FI862808A FI862808A (fi) 1986-07-02 1986-07-02 Foerfarande och anordning foer avvattning av en fiberbana.

Publications (2)

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

Family

ID=8522867

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87305818A Expired - Lifetime EP0251778B1 (de) 1986-07-02 1987-07-01 Verfahren und Vorrichtung zum Entwässern einer Faserbahn in einer Papiermaschine

Country Status (8)

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

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
AU4307889A (en) * 1988-10-31 1990-05-28 Beloit Corporation Forming apparatus
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 (de) * 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
KR880001887A (ko) 1988-04-27
BR8703365A (pt) 1988-03-15
JPH0444038B2 (de) 1992-07-20
KR900002102B1 (ko) 1990-04-02
FI862808A0 (fi) 1986-07-02
JPH01118690A (ja) 1989-05-11
DE3769710D1 (de) 1991-06-06
FI862808A (fi) 1988-01-03
ES2022356B3 (es) 1991-12-01
ATE63145T1 (de) 1991-05-15
EP0251778A1 (de) 1988-01-07

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