EP0251778A1 - 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
EP0251778A1
EP0251778A1 EP87305818A EP87305818A EP0251778A1 EP 0251778 A1 EP0251778 A1 EP 0251778A1 EP 87305818 A EP87305818 A EP 87305818A EP 87305818 A EP87305818 A EP 87305818A EP 0251778 A1 EP0251778 A1 EP 0251778A1
Authority
EP
European Patent Office
Prior art keywords
web
dewatering
cover
dewatering unit
units
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.)
Granted
Application number
EP87305818A
Other languages
English (en)
French (fr)
Other versions
EP0251778B1 (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
Ahlstrom Corp
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(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Ahlstrom Corp, Valmet Karhula Inc filed Critical Ahlstrom Corp
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
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 patent 3138133 discloses different alternatives of arranging drainage at a twin wire former.
  • the only features common to the vari­ ations are that, in the dewatering zone, the web is wavy and the dewatering elements disposed both above and below the web are positioned alternately. Furthermore, it has to be noted that in said device disclosed in the patent, 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 primarily 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.
  • the method according to the present invention is characterized in that the position of the cover of one dewatering unit is adjusted relative to the the cover of the other dewatering unit, thereby affecting both the intensity of the turbulence generated in the web surface and the distribution of the components of said turbulence, said components moving in different directions.
  • the apparatus according to the present invention is char­acterized in that web forming is effected in a twin wire former, said former having two dewatering units, the covers of which units or a side portion thereof comprise rows of press­ure elements, which elements at least partly match or are at least partially aligned on opposite sides of the web.
  • 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 30 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 the longitudinal angle 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.
  • Fig. 4 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.
  • the pressure elements 24 and 33 only partly match i.e. they are partly out of vertical alignment.
  • a cor­responding result is also achieved if 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.

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)
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 true EP0251778A1 (de) 1988-01-07
EP0251778B1 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)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3815316A1 (de) * 1988-05-05 1989-11-16 Escher Wyss Gmbh Vorrichtung zur entwaesserung an einem doppelsieb-former
WO1990005210A1 (en) * 1988-10-31 1990-05-17 Beloit Corporation Forming apparatus
EP0397430A1 (de) * 1989-05-08 1990-11-14 Valmet Paper Machinery Inc. Papierbahn formendes Verfahren und Vorrichtung
EP0438681A1 (de) * 1990-01-26 1991-07-31 Voith Sulzer Papiermaschinen GmbH Entwässerungsvorrichtung an einem Doppelsiebformer
DE4002304A1 (de) * 1990-01-26 1991-08-14 Escher Wyss Gmbh Former in einer papiermaschine
EP0520970A1 (de) * 1991-06-26 1992-12-30 Valmet Paper Machinery Inc. Doppelsiebformer in einer Papiermaschine
WO1993012292A1 (de) * 1991-12-17 1993-06-24 J.M. Voith Gmbh Doppelsiebformer
US5282933A (en) * 1990-11-20 1994-02-01 Sulzer Escher Wyss Gmbh Wet section for a twin wire papermaking machine
EP0393656B1 (de) * 1989-04-19 1994-02-16 Valmet-Tampella Inc. Einrichtung in einer Papiermaschine zur Erzielung von Aufwärtsentwässerung
EP1489226A2 (de) * 2003-06-18 2004-12-22 Voith Paper Patent GmbH Vorrichtung zur Verbesserung der Eigenschaften einer in einer Blattbildungsvorrichtung hergestellten Faserstoffbahn
EP1806453A1 (de) * 2006-01-05 2007-07-11 Andritz AG Verfahren und Vorrichtung zur Entwässerung einer Faserstoffbahn

Citations (2)

* 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
US4425188A (en) * 1981-03-28 1984-01-10 Mitsubishi Jukogyo Kabushiki Kaisha Forming shoes for the twin-wire former of a paper making machine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5122521A (ja) * 1974-08-15 1976-02-23 Kubota Ltd Sehisochitsukitaueki
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

Patent Citations (2)

* 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
US4425188A (en) * 1981-03-28 1984-01-10 Mitsubishi Jukogyo Kabushiki Kaisha Forming shoes for the twin-wire former of a paper making machine

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3815316A1 (de) * 1988-05-05 1989-11-16 Escher Wyss Gmbh Vorrichtung zur entwaesserung an einem doppelsieb-former
US5116477A (en) * 1988-05-05 1992-05-26 Sulzer-Escher Wyss Gmbh Drainage device in a double-sieve mold
WO1990005210A1 (en) * 1988-10-31 1990-05-17 Beloit Corporation Forming apparatus
EP0393656B1 (de) * 1989-04-19 1994-02-16 Valmet-Tampella Inc. Einrichtung in einer Papiermaschine zur Erzielung von Aufwärtsentwässerung
EP0397430A1 (de) * 1989-05-08 1990-11-14 Valmet Paper Machinery Inc. Papierbahn formendes Verfahren und Vorrichtung
EP0438681A1 (de) * 1990-01-26 1991-07-31 Voith Sulzer Papiermaschinen GmbH Entwässerungsvorrichtung an einem Doppelsiebformer
DE4002304A1 (de) * 1990-01-26 1991-08-14 Escher Wyss Gmbh Former in einer papiermaschine
US5320713A (en) * 1990-01-26 1994-06-14 Sulzer Escher Wyss Gmbh Method of using a forming section of a papermaking machine
US5282933A (en) * 1990-11-20 1994-02-01 Sulzer Escher Wyss Gmbh Wet section for a twin wire papermaking machine
EP0520970A1 (de) * 1991-06-26 1992-12-30 Valmet Paper Machinery Inc. Doppelsiebformer in einer Papiermaschine
US5387320A (en) * 1991-06-26 1995-02-07 Valmet Paper Machinery, Inc. Twin-wire web former in a paper machine
WO1993012292A1 (de) * 1991-12-17 1993-06-24 J.M. Voith Gmbh Doppelsiebformer
US5507918A (en) * 1991-12-17 1996-04-16 J.M. Voith Gmbh Twin-wire former
EP1489226A2 (de) * 2003-06-18 2004-12-22 Voith Paper Patent GmbH Vorrichtung zur Verbesserung der Eigenschaften einer in einer Blattbildungsvorrichtung hergestellten Faserstoffbahn
EP1489226A3 (de) * 2003-06-18 2005-08-17 Voith Paper Patent GmbH Vorrichtung zur Verbesserung der Eigenschaften einer in einer Blattbildungsvorrichtung hergestellten Faserstoffbahn
EP1806453A1 (de) * 2006-01-05 2007-07-11 Andritz AG Verfahren und Vorrichtung zur Entwässerung einer Faserstoffbahn

Also Published As

Publication number Publication date
FI862808A0 (fi) 1986-07-02
BR8703365A (pt) 1988-03-15
DE3769710D1 (de) 1991-06-06
ATE63145T1 (de) 1991-05-15
KR880001887A (ko) 1988-04-27
KR900002102B1 (ko) 1990-04-02
JPH01118690A (ja) 1989-05-11
JPH0444038B2 (de) 1992-07-20
ES2022356B3 (es) 1991-12-01
FI862808A (fi) 1988-01-03
EP0251778B1 (de) 1991-05-02

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