EP0438685B1 - Former in einer Papiermaschine - Google Patents

Former in einer Papiermaschine Download PDF

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Publication number
EP0438685B1
EP0438685B1 EP90123544A EP90123544A EP0438685B1 EP 0438685 B1 EP0438685 B1 EP 0438685B1 EP 90123544 A EP90123544 A EP 90123544A EP 90123544 A EP90123544 A EP 90123544A EP 0438685 B1 EP0438685 B1 EP 0438685B1
Authority
EP
European Patent Office
Prior art keywords
wire
bars
forming unit
unit according
wires
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
EP90123544A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0438685A1 (de
Inventor
Alfred Dr. Bubik
Hans Dr. Dahl
Otto Hildebrand
Karl Müller
Jörg Walter
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.)
Sulzer Escher Wyss GmbH
Original Assignee
Sulzer Escher Wyss GmbH
Escher Wyss GmbH
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=6398848&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0438685(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Sulzer Escher Wyss GmbH, Escher Wyss GmbH filed Critical Sulzer Escher Wyss GmbH
Priority to AT90123544T priority Critical patent/ATE101217T1/de
Publication of EP0438685A1 publication Critical patent/EP0438685A1/de
Application granted granted Critical
Publication of EP0438685B1 publication Critical patent/EP0438685B1/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
    • 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 invention relates to a former for a paper machine of the type described in the preamble of claim 1 and its advantageous use.
  • Formers of this type can be operated both in the immediate vicinity of a headbox, the suspension being injected in a flat jet into the space formed by the convergence of the sieves and then dewatered between the sieves, but they can also be provided with a pre-dewatering section in which Care is taken to ensure that the suspension coming from the headbox is guided over a certain distance on a sieve, with some of the water contained in the suspension being able to be led out, in particular downwards, even before it enters the former.
  • the pre-dewatering section is then followed by the former of the type described here, the pre-dewatered suspension generally remaining on the sieve and the former being formed as a so-called twin-wire former while adding another sieve.
  • a ledge is inserted from the opposite side against the opposite drainage slot, most effectively at each slot and with considerable pressure so that the liquid is pressed out of the web can.
  • this pressure can be so high that the web to be formed is crushed between the sieves. If the pressure is absent or too low, the web can be re-moistened from above by the previously squeezed out liquid and thereby adversely changed. With the high pressures to be used, the sieves also suffer and are worn out earlier. Because of the narrow spacing between the strips, the spaces between the strips become dirty due to fibers and ashes being pushed out too much.
  • the lower strips are mounted on a flexible plate. There, however, the water drained downwards has to be discharged laterally between the strips, so that the amount is limited and there is a risk of contamination. No individual contact pressure of the strips can be set, and the reproducibility of the setting is insufficient.
  • the strips on the lower sieve increase: sieve wear; the diarrhea, i.e. too many fines and ashes are washed out of the web; the formation impulses which are obtained on the lasts are inevitably too high in the previous devices, and often they lead to a formation deterioration in the case of substances sensitive to shear force.
  • the drainage and formation are carried out in a gentle manner according to the local technological conditions of the railway and according to the actual local need.
  • a former for a paper machine relating to the invention is shown schematically. In a suitably adapted form, it can also be used for a board machine.
  • a paper sheet possibly a cardboard sheet, is formed in the former between an upper wire 1 and a lower wire 2.
  • the suspension located between sieves 1 and 2 is dewatered, forming the sheet. This should maintain a homogeneous structure.
  • Dewatering and formation are carried out using strips 3 and 4, one with reference number 3 above the upper sieve 1 and the other 4 below the lower sieve 2 are provided.
  • the strips 3 and 4 are arranged along the formation section, run transversely to the machine direction and are adjustable relative to the screens 1 and 2, so that they touch the screens facing them, which run past them, supported during operation.
  • the strips 3 which have to touch the top sieve 1
  • various known expedient forms that can be used.
  • the sides of the strips 3 facing the sieve produce a conforming surface which forms the spatial shape of the formation section. It forms e.g. a rust-shaped bottom surface of a housing 12 facing the upper sieve 1 for collecting and removing the liquid flowing through the gaps 5 'during operation.
  • the spatial shape of the formation section can be formed by a straight line, as is the case according to FIG. 1. However, the shape can also be formed by a concave or convex curve, which are shown in FIG. 2 or FIG. 3, or an approximately wavy or arbitrary curve.
  • the strips 3 are arranged along the surface at intervals 5, whereby the columns 5 'are formed.
  • the strips 4, which have to be coated on the bottom wire 2 are each designed in a suitable form. They can have smaller differences from one another, for example in the design of their head part facing the lower sieve 2. It is an advantage of the subject matter of the invention that, viewed transversely to the direction of travel, larger tolerances are permissible without disadvantage for the dimensional accuracy of the head part facing the lower wire because of the relatively large distance between these strips resulting from the characteristics.
  • the Possibilities To Favorably Form The Sheet Formation Process influence can also be improved by deliberately created inequalities across the width. It is also conceivable to correct the shape of the head part over the width, in particular during operation, for example by deforming it in zones.
  • the strips 4 are arranged on a table 7 which can be positioned relative to the lower wire 2 along the formation path at regular or irregular intervals 6.
  • the individual distance 6 is in each case greater than the sum of the width of an individual bar 3 located in the top wire and the distance 5 to the adjacent bar located in the top wire, in the machine running direction.
  • the invention is based on a formation section with a length of 500 to 3000 mm. In this case strips 3 or 4 with a width of between 10 and 60 mm would be used.
  • zones e.g. 1 to 10 in number.
  • inserts 8 which match the same intervals 5, which means that a longitudinal section of the surface is without suction.
  • the individual drainage gaps 5 ' can also advantageously be acted upon with different vacuum.
  • the partitions 11 shown schematically here in the housing 12 are required and an extraction system which can be set to several negative pressures.
  • the strips 4 to be touched on the lower wire 2 are mounted on the table 7, which can advantageously be raised, inclined and longitudinally displaceable relative to the lower wire during operation, so as to be positionable in the machine running direction. Ie they are not permanently connected to the table 7 at one point. For example, on the surface of the table there are several grooves running transversely to the machine direction, into which grooves with dovetail connection strips 4 can be pushed in and out. In this way, the strips 4 can, if required, be moved to another location during operation by pulling them out of a previous position from the side of the machine and pushing them into a new desired position, that is to say into a different groove.
  • the strips 4 to be touched on the bottom wire 2 are individually adjustable, supported on the table, in the direction of the bottom wire 2.
  • the height of each can be adjusted individually. It when the strips 4 are pneumatically or hydraulically adjustable is particularly advantageous. They can be supported elastically and resiliently against the table 7 during operation on an air cushion 9, for example by have two telescopically nested parts, between which an inflatable air bellows is arranged.
  • the zone formation along the fitting surface with the strips 3, the positioning of the strips 4 on the table 7, the individual adjustment of the strips 4 and the positioning of the table 7 enable the papermaker, the drainage and the formation of the sheet between the screens according to the technological requirements and the situation in a large operating area. All of the problems mentioned at the beginning the process can be overcome. It is possible to make the process gentle, as far as the paper sheet to be formed and the surrounding sieves are concerned.
  • the pneumatically elastic support of the strips 4 and the table 7 also contributes to this, which is able to compensate elastically for a suddenly occurring increase in the thickness of the suspension web between the sieves without damaging the sheet or the sieves.

Landscapes

  • Paper (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Basic Packing Technique (AREA)
  • Soil Working Implements (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
EP90123544A 1990-01-26 1990-12-07 Former in einer Papiermaschine Expired - Lifetime EP0438685B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90123544T ATE101217T1 (de) 1990-01-26 1990-12-07 Former in einer papiermaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4002304A DE4002304A1 (de) 1990-01-26 1990-01-26 Former in einer papiermaschine
DE4002304 1990-01-26

Publications (2)

Publication Number Publication Date
EP0438685A1 EP0438685A1 (de) 1991-07-31
EP0438685B1 true EP0438685B1 (de) 1994-02-02

Family

ID=6398848

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90123544A Expired - Lifetime EP0438685B1 (de) 1990-01-26 1990-12-07 Former in einer Papiermaschine

Country Status (7)

Country Link
US (1) US5320713A (sv)
EP (1) EP0438685B1 (sv)
JP (1) JP2996747B2 (sv)
AT (1) ATE101217T1 (sv)
CA (1) CA2034993C (sv)
DE (2) DE4002304A1 (sv)
FI (1) FI109711B (sv)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4005420C2 (de) * 1990-02-21 1995-06-08 Voith Gmbh J M Doppelsiebformer
FI90673C (sv) * 1991-06-26 1994-03-10 Valmet Paper Machinery Inc Banformningsparti med dubbel vira i en pappersmaskin
DE4141607C2 (de) * 1991-12-17 1996-04-25 Voith Gmbh J M Doppelsiebformer
DE4212609A1 (de) * 1991-12-17 1993-10-28 Voith Gmbh J M Doppelsiebformer
DE4219292A1 (de) * 1992-06-12 1993-12-16 Escher Wyss Gmbh Doppelsiebformer
DE4332162C2 (de) * 1993-09-22 1994-12-01 Voith Gmbh J M Doppelsiebformer einer Papiermaschine
FI112509B (sv) * 1994-06-15 2003-12-15 Metso Paper Inc Gapformare i en pappersmaskin
JP3181202B2 (ja) * 1995-03-27 2001-07-03 三菱重工業株式会社 抄紙機ツインワイヤフォーマの脱水機器
US5725734A (en) * 1996-11-15 1998-03-10 Kimberly Clark Corporation Transfer system and process for making a stretchable fibrous web and article produced thereof
US6447641B1 (en) 1996-11-15 2002-09-10 Kimberly-Clark Worldwide, Inc. Transfer system and process for making a stretchable fibrous web and article produced thereof
DE19920438A1 (de) * 1999-05-04 2000-11-09 Voith Sulzer Papiertech Patent Verfahren und Vorrichtung zum Herstellen einer mehrlagigen Faserstoffbahn
AU2002213688A1 (en) * 2000-10-16 2002-04-29 Mark Landry Adjustable activity drainage box
DE50206776D1 (de) * 2001-04-02 2006-06-22 Voith Paper Patent Gmbh Pressanordnung und Saugelement
DE102005038424A1 (de) 2005-08-12 2007-02-15 Voith Patent Gmbh Verfahren zur Herstellung einer Faserstoffbahn und Doppelsiebformer zur Durchführung des Verfahrens
DE102007000065A1 (de) 2007-02-01 2008-08-07 Voith Patent Gmbh Verfahren zur Herstellung einer Faserstoffbahn und Doppelsiebformer zur Durchführung des Verfahrens
DE102007034180A1 (de) 2007-07-23 2009-01-29 Voith Patent Gmbh Doppelsiebformer einer Maschine zur Herstellung einer Faserstoffbahn und Verfahren zur Herstellung einer Faserstoffbahn
DE102007035488A1 (de) 2007-07-28 2009-01-29 Voith Patent Gmbh Verfahren zur Herstellung einer Faserstoffbahn und Doppelsiebformer zur Durchführung des Verfahrens
DE102007000771A1 (de) * 2007-09-26 2009-04-02 Voith Patent Gmbh Doppelsiebformer
DE102008040688A1 (de) 2008-07-24 2010-01-28 Voith Patent Gmbh Verfahren zur Optimierung der Energiebilanz in Formiereinheiten in Maschinen zur Herstellung von Faserstoffbahnen und Formiereinheit
DE102009027432A1 (de) * 2009-07-02 2011-01-05 Voith Patent Gmbh Formiereinheit und Verfahren zur Herstellung einer Materialbahn
DE102010031169A1 (de) 2010-07-09 2012-01-12 Voith Patent Gmbh Blattbildungssystem für eine Maschine zur Herstellung einer zumindest einschichtigen Faserstoffbahn

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI72157C (sv) * 1974-07-18 1987-04-13 Valmet Oy Dubbelviradel i pappersmaskin.
FI70739C (fi) * 1977-04-28 1986-10-06 Valmet Oy Banbildningsenhet vid framstaellning av flerskiktskartong
DE3153305C2 (de) * 1981-09-04 1986-10-23 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Entwässerungseinheit für Langsieb-Papiermaschinen
FI82084C (sv) * 1985-01-28 1991-01-10 Valmet Oy Övre viraenhet
DE3503242A1 (de) * 1985-01-31 1986-08-07 O. Dörries GmbH, 5160 Düren Vorrichtung zum fuehren der siebe einer doppelsiebpartie einer papier- oder kartonmaschine
DE3546629C2 (en) * 1985-01-31 1988-12-01 O. Doerries Gmbh, 5160 Dueren, De Device for guiding the wires of a twin-wire section of a paper- or cardboard-machine
FI862808A (fi) * 1986-07-02 1988-01-03 Ahlstroem Oy Foerfarande och anordning foer avvattning av en fiberbana.
FI862809A (fi) * 1986-07-02 1988-01-03 Ahlstroem Oy Stoedande av en avvattningsenhet pao pappersmaskinens formningsdel.
GB8710428D0 (en) * 1987-05-01 1987-06-03 Beloit Corp Multi-ply web forming apparatus
SE456590B (sv) * 1987-09-07 1988-10-17 Ahlstroem Valmet Anordning for styrning av viror i en pappersmaskin eller kartongmaskin
DE3815316C2 (de) * 1988-05-05 1996-02-01 Voith Sulzer Papiermasch Gmbh Vorrichtung zur Entwässerung an einem Doppelsieb-Former
DE3815470A1 (de) * 1988-05-06 1989-11-16 Voith Gmbh J M Doppelsieb-former
DE4005420C2 (de) * 1990-02-21 1995-06-08 Voith Gmbh J M Doppelsiebformer

Also Published As

Publication number Publication date
FI109711B (sv) 2002-09-30
DE4002304A1 (de) 1991-08-14
JP2996747B2 (ja) 2000-01-11
CA2034993A1 (en) 1991-07-27
DE59004517D1 (de) 1994-03-17
DE4002304C2 (sv) 1992-02-06
US5320713A (en) 1994-06-14
EP0438685A1 (de) 1991-07-31
ATE101217T1 (de) 1994-02-15
JPH04327290A (ja) 1992-11-16
FI910362A0 (fi) 1991-01-24
CA2034993C (en) 1996-03-19
FI910362A (fi) 1991-07-27

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