EP0607549B1 - Partie humide d'une machine à papier - Google Patents

Partie humide d'une machine à papier Download PDF

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Publication number
EP0607549B1
EP0607549B1 EP93119658A EP93119658A EP0607549B1 EP 0607549 B1 EP0607549 B1 EP 0607549B1 EP 93119658 A EP93119658 A EP 93119658A EP 93119658 A EP93119658 A EP 93119658A EP 0607549 B1 EP0607549 B1 EP 0607549B1
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EP
European Patent Office
Prior art keywords
wire
pressure
rails
belt
forming cylinder
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
EP93119658A
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German (de)
English (en)
Other versions
EP0607549A1 (fr
Inventor
Klaus Esslinger
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.)
JM Voith GmbH
Original Assignee
JM Voith GmbH
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Filing date
Publication date
Application filed by JM Voith GmbH filed Critical JM Voith GmbH
Publication of EP0607549A1 publication Critical patent/EP0607549A1/fr
Application granted granted Critical
Publication of EP0607549B1 publication Critical patent/EP0607549B1/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
    • 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 wire section for a paper machine, in detail with the features from the preamble of claim 1.
  • twin wire former in which two endless wire belts form a twin wire zone, which can be divided into three sections.
  • the two sieves run over a curved one Support surface of a support body, preferably a forming cylinder. she there form a wedge-shaped inlet gap, which the headbox immediately assigned.
  • part of the water becomes the Pulp suspension discharged downwards; another part penetrates - due to the tension of the top wire - up through the top wire and is removed by means of negative pressure.
  • the drainage pressure is in the Wrapping area of the sieve belts with the forming cylinder is the same.
  • both sieve belts run over another curved one Support surface of a support body.
  • the support body is as Forming shoe with a curved surface.
  • the resiliently supported strips in the second section provide strength directed to the inner surface of the lower wire. They have a linear effect Loads caused by minimal changes in cross-section when Flow of the fiber suspension with high working speed Cause turbulence in it and avoid flaking.
  • the support bodies are designed differently, for example as a sieve table with a closed surface or with an opening for the purpose of suction, or as a forming cylinder or as a strip-shaped element.
  • the arrangement of the elastically designed blades in relation to the sieve belt supported by the supporting surface and their elasticity are important.
  • a change in the size of the pressure impulses takes place in the described embodiments mechanically by means of spindles or pneumatically by means of hoses which rest on the blade body and, due to a change in cross-section, lead to increased bending stress on the blade body and thus to an increase in the contact pressure of the blade body part in contact with the screen belt.
  • the blade arrangement with the associated adjustment mechanism for changing the contact pressures is characterized by a relatively complicated structure. So essentially only one installation position of the blades is possible.
  • the level of the contact pressure depends on the blade properties, especially the elasticity of the blade material. With low contact forces, high blade elasticity and formation of lumps in the fiber suspension, there is a risk of the blade body vibrating.
  • the contact pressure and thus the hydraulic pressure in the suspension or the pressure pulse effective in the suspension continue to depend on the blade angle.
  • wear on the blade edge leads to a change in the blade angle. This is particularly problematic when the blade edge is worn unevenly across the machine width.
  • Another disadvantage of this design is that chunks that are formed from fine material that penetrates through the sieve mesh during dewatering and that can form in front of and behind the blade into a wedge that is arranged between the blade and the blade by the arrangement of the blade and support surface Support surface is formed, and there damage the sieves.
  • GB-A-2 045 827 shows and describes a twin-wire former in accordance with the preamble of claim 1. There are already pressure elements which face the outer wire. However, these pressure elements are not touching the outer screen. The invention is based on this document.
  • the invention has for its object the possibilities for Intensify drainage and improve Fiber web quality by preventing flocculation in the Fibrous suspension in a wire section of the type mentioned above further develop that the entire length of the wire section one Paper machine is reduced.
  • the disadvantages of the known Explanations should be avoided.
  • the printing elements as strips, squeegees or concave Pressure shoes are formed, can be together or each for itself over the entire width of the sieve extend. It is also possible to tilt or to be rotatably supported.
  • An arrangement of the pressure elements at an angle to The direction of the pulp suspension is also conceivable.
  • the arrangement of the pressure elements is preferably carried out such that the for pressing the pressure elements required forces directed perpendicular to the sieve belt are. This offers the advantage that the full contact pressure can be directed as a pressure force on the sieve belts.
  • the pressure elements are preferably stored on a support frame that is mounted on the machine frame and is pivotable from the support surface.
  • the support frame is preferably around Forming cylinder axis swiveling and on the housing of the Forming cylinder bearing attached.
  • Figure 1 illustrates a section of a wire section a twin-wire paper machine.
  • the support body 1 is a Forming cylinder 1a. His coat can be a closed one Have area. However, as in FIG. 1 shown, provided with a variety of holes be, for example for storing the squeezed Filtrate or for the purpose of suction at desired bilateral drainage.
  • the forming cylinder 1a as Central unit is made up of two endless sieve belts 2 and 3 wrapped around part of its circumference (Wrapping area 4). Along this arc piece on Circumference of the forming cylinder and over a further distance these sieve belts are guided and formed together together a twin wire zone up to a suction roll 5.
  • Both sieve belts run in the immediate vicinity of the Headbox 6 via a roller 7 or a cylinder together - the screen belt 2 over the forming cylinder 1a and the sieve belt 3 over a breast roller 7 - so that the two Sieve belts together at the beginning of the twin-wire zone wedge-shaped inlet gap 8 for the fiber suspension form.
  • the forming cylinder is inside the endless screen belt 2 and a device 9, which in the exemplary embodiment a support frame 18 and the resiliently supported Pressure elements 10 for forwarding the forces on the Sieve belt inner surface of the sieve belt 3 in Wrapping area with the forming cylinder 1a, is arranged within the endless sieve belt 3.
  • the resiliently supported pressure elements are preferably like in U.S. Patent No. 5,078,835. You can do this as Bar 12 (Fig. 2) or as a roll - preferably that is Printing element then a doctor blade 14 (Fig. 3) - formed be. Another option is to use it of a pressure shoe 15 with a concave pressure surface (Fig. 4).
  • the resiliently supported pressure elements 10 conduct forces, for example by springs or can also be generated pneumatically on the inner surface of the Sieve belt 3 and thus generate depending on the type of used Pressure elements point or line loads on the Screen belt that causes turbulence in the fiber suspension between the two sieve belts.
  • the initiated Pulsations prevent the formation of flakes, and it will be due to the pressure and with it associated change in fabric tension more water eliminated.
  • the counter force acts as the im Wrapping area over the entire width of the sieve extending part of the outer surface of the forming cylinder.
  • the size of the forces introduced by the action of the pressure elements 10 on the inner surface of the sieve belt 3 lead to a certain applied pressure is variable and does not have to cover the entire loop area be kept constant. Because of the design and Arrangement of the pressure elements, the forces act so that still pressure-free places in the wrapping area of the sieve belts remain with the forming cylinder. Pressure free areas and are the resilient support of the pressure elements necessary to by possible aggregation of the fibers caused backlogs in the fiber suspension avoid.
  • the force is preferably applied radially to the Forming cylinder axis; but it also becomes an opportunity a force transmission is provided in which only one Component of the force acting radially to the forming cylinder axis (Figs. 5 and 6). These figures illustrate at the same time the possibility of using hybrid molds.
  • the endless screen belt 3 loops after one Fourdrinier arrangement on which the fiber suspension is dewatered conventionally - preferably by Guide the screen belt over strips 16 - a support body 1 - executed here in the form of a solid jacket roller - on one Part of its scope.
  • Another endless screen belt 2 is merged with the screen belt 3 via a roller 17. in the Looping area and no more here The guided route shown forms the two Sieve belts a twin-wire zone.
  • the tangential component F t counteracts the rotating movement of the solid jacket roller as a frictional force.
  • the action of the pressure elements 10 leads to an increase in the dewatering already caused by the centrifugal forces occurring during rotation.
  • the endless sieve belts 2 and 3 form a twin-wire zone.
  • resiliently supported pressure elements 10 which are designed as rotatably or tiltably mounted strips, ie the strips are not stored directly at their ends, but in a region of their length.
  • the strips are connected to a fixed bearing via a joint between the strip ends.
  • a force acts, for example generated by springs. Due to the lever law, it causes an equal counterforce at the end of the other lever arm.
  • the component F r of this counterforce F acting radially to the forming cylinder axis is the compressive force acting directly on the inner surface of the belt.
  • the force distribution and effect of the individual force components is carried out analogously to the arrangement shown in FIG. 5.
  • the printing elements 10 are on one swing-away support frame 18, which is on the machine frame supported, stored.
  • Another possibility is the Storage of the pressure elements on a support frame 19, the preferably on the housing 20 of the Formation cylinder axis storage is attached.
  • Figures 7 and 7.1 show the storage in two views.
  • the pressing of pressure elements on a screen belt, the supports against a support body especially in the Production of multi-ply paper, cardboard and also very thin paper, i.e. where there is a one-sided section Drainage is desired, special advantages.
  • the support body must be closed Have support surface.
  • FIG. 8 shows an embodiment of the invention as it can be used for example for the production of cardboard.
  • the part of a wire section shown in this figure consists of two areas, a four-wire and a twin-wire zone.
  • Two headboxes are provided for applying the layers, a primary headbox 21 and a secondary headbox 22.
  • the fiber suspension in the fourdrinier area of the wire belt 2 is conventionally pre-dewatered - preferably by passing the wire belt over strips 16 and by additional suction.
  • the sieve belt 2 then runs in the immediate vicinity of the secondary headbox 22 via an endless belt 1c, which is guided by a plurality of guide rollers 23, with the sieve belt 3, which runs over a roller 7, so that the two sieve belts merge with one another at the beginning of the twin-wire zone form wedge-shaped inlet gap 8 for the fibrous suspension.
  • the endless belt 1c is arranged within the sieve belt 2 and supports it on its inner surface in the wrapping area of the sieve belt 2 with the belt 1c. At the same time, the belt 1c supports the outer surface of the sieve belt 3 in the wrapping area of this belt with the belt 1c.
  • the device 9 which consists of the support frame and the pressure elements, is arranged within the screen belt 3 so that the surface of the belt 1c acts as a counter pressure surface for the pressure elements.
  • the drainage takes place on one side in the direction of the pressure elements away from the support surface of the support belt 1c and essentially only by the pressure impulses introduced, because the sieve belts run in this area due to the guidance of the belt 1c over a plurality of guide rollers which cause a straight belt path between the individual guide rollers , almost parallel.
  • the pressure impulses introduced which cause turbulence in the fiber suspension, also prevent flocculation of the individual fibers.
  • the two screen belts are separated from one another on the roller 24.
  • Support body / pressure elements for the respective application in their embodiment can be varied.
  • a Lining up several arrangements of support bodies and Print elements are possible.

Landscapes

  • Paper (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Claims (6)

  1. Section de toile d'une machine à papier
    1.1 avec deux bandes de toile sans fin - une première bande de toile et une seconde bande de toile - qui forment ensemble une zone à double toile sur une partie de leur circonférence
    1.2 avec au moins un cylindre de formation disposé au droit de la zone à double toile comme élément de soutien (1) dont la surface de la virole sert de surface de soutien
    1.3 au moins une partie de la surface de soutien soutient la première bande de toile sur sa surface intérieure et la seconde bande de toile sur sa surface extérieure
    1.4 des éléments de pression (10) exercent une pression sur la surface intérieure de la seconde bande de toile dans la zone où celle-ci est soutenue par la surface de soutien
    1.5 les éléments de pression (10) n'exercent la pression qu'en des endroits déterminés (zones de pression) de sorte qu'il y a également des zones exemptes de pression
    1.6 les zones de pression sont réparties sur toute la largeur de la toile
    1.7 les éléments de pression sont conformés sous forme de liteaux caractérisée par les caractéristiques suivantes:
    1.8 les liteaux (10) sont placés en contact sur la toile extérieure (3)
    1.9 les liteaux (10) présentent des surfaces de pression non tranchantes
    1.10 les liteaux (10) sont répartis sur une partie significative de la zone de la circonférence du cylindre de formation (1a) embarrée par les deux toiles (2, 3)
    1.11 les liteaux (10) peuvent être appliqués de façon souple contre la toile extérieure (3).
  2. Section de toile selon la revendication 1, caractérisée en ce que les liteaux (10) sont pour l'essentiel placés verticalement sur la toile extérieure (3) ou légèrement inclinés par rapport à la verticale.
  3. Section de toile selon la revendication 1 ou 2, caractérisée en ce que les surfaces de pression des liteaux (10) sont conformées concaves.
  4. Section de toile selon l'une des revendications 1 à 3, caractérisée en ce que les liteaux (10) sont logés sur un châssis support (18) pivotable autour de l'axe longitudinal du cylindre de formation (1a).
  5. Section de toile selon la revendication 4, caractérisée en ce que le châssis support (18) est fixé sur le carter (20) du logement du cylindre de formation.
  6. Section de toile selon l'une des revendications 1 à 5, caractérisée en ce que les éléments de pression sont logés pivotables.
EP93119658A 1993-01-18 1993-12-07 Partie humide d'une machine à papier Expired - Lifetime EP0607549B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4301103 1993-01-18
DE4301103A DE4301103C1 (de) 1993-01-18 1993-01-18 Siebpartie einer Papiermaschine

Publications (2)

Publication Number Publication Date
EP0607549A1 EP0607549A1 (fr) 1994-07-27
EP0607549B1 true EP0607549B1 (fr) 1999-09-01

Family

ID=6478362

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93119658A Expired - Lifetime EP0607549B1 (fr) 1993-01-18 1993-12-07 Partie humide d'une machine à papier

Country Status (7)

Country Link
US (1) US5480520A (fr)
EP (1) EP0607549B1 (fr)
JP (1) JPH06235185A (fr)
AT (1) ATE184062T1 (fr)
CA (1) CA2113673C (fr)
DE (2) DE4301103C1 (fr)
FI (1) FI940155A7 (fr)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4420801C2 (de) * 1994-06-16 1997-01-30 Voith Gmbh J M Verfahren zum Betreiben einer Doppelsiebzone einer Papiermaschine zur Herstellung von Faserstoffbahnen sowie Siebzone hierzu
DE4443874C2 (de) * 1994-12-09 1996-10-31 Voith Sulzer Papiermasch Gmbh Doppelsieb-Gap-Former zur Papierherstellung
US5766419A (en) * 1996-07-23 1998-06-16 Valmet Corporation Twin-wire gap former in a paper machine
DE19634995A1 (de) * 1996-08-30 1998-03-05 Voith Sulzer Papiermasch Gmbh Naßpartieabschnitt einer Papiermaschine mit einem stoffdichtegeregelten Stoffauflauf und Doppelsieb-Former
DE19756203A1 (de) * 1996-12-23 1998-09-24 Voith Sulzer Papiermasch Gmbh Naßpartie und Verfahren zur Herstellung einer Faserstoffbahn
DE19706923A1 (de) * 1997-02-20 1998-08-27 Voith Sulzer Papiermasch Gmbh Siebpartie, Verfahren zum Herstellen einer Siebpartie sowie Verfahren zur Blattbildung in einer Siebpartie
DE19706940A1 (de) * 1997-02-20 1998-08-27 Voith Sulzer Papiermasch Gmbh Siebpartie und Verfahren zur Blattbildung in einer Siebpartie einer Papiermaschine
DE19733316A1 (de) * 1997-08-01 1999-02-04 Voith Sulzer Papiermasch Gmbh Verfahren und Vorrichtung zum Bilden einer Faserstoffbahn
DE19733318A1 (de) * 1997-08-01 1999-02-04 Voith Sulzer Papiermasch Gmbh Doppelsiebformer
DE19803591A1 (de) * 1998-01-30 1999-08-05 Voith Sulzer Papiertech Patent Doppelsieb-Former
DE19902274A1 (de) * 1999-01-21 2000-07-27 Voith Sulzer Papiertech Patent Siebpartie sowie Bandführungseinrichtung für eine solche Siebpartie
DE10046227A1 (de) * 2000-09-19 2002-03-28 Voith Paper Patent Gmbh Vorrichtung und Verfahren zur Entwässerung einer Faserstoffbahn
JP2003239187A (ja) * 2002-02-12 2003-08-27 Mitsubishi Heavy Ind Ltd ツインワイヤ抄紙機
DE10332658A1 (de) * 2003-07-18 2005-02-03 Voith Paper Patent Gmbh Siebpartie in einer Maschine zur Herstellung einer Faserstoffbahn
DE10342019A1 (de) * 2003-09-12 2005-04-07 Voith Paper Patent Gmbh Doppelsiebformer einer Maschine zur Herstellung einer Faserstoffbahn und dazugehöriges Verfahren
CA2879182C (fr) * 2004-05-25 2017-02-14 Medimmune, Inc. Variantes hemagglutinine et neuraminidase de la grippe
US7510630B2 (en) * 2005-04-20 2009-03-31 Albany International Corp. Extended couch nip on cylinder former

Family Cites Families (18)

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Publication number Priority date Publication date Assignee Title
FR591799A (fr) * 1924-08-12 1925-07-17 Procédé et dispositif pour l'extraction de l'air et de l'eau contenus dans la pâte à papier
US1875075A (en) * 1930-01-25 1932-08-30 Masonite Corp Liquid separation
GB992299A (en) * 1963-05-06 1965-05-19 Bowater Res & Dev Company Ltd Method of and apparatus for making a fibrous web
DE1511238A1 (de) * 1966-03-01 1969-09-04 Voith Gmbh J M Siebpartie einer Langsieb-Entwaesserungsmaschine zum Herstellen von Faserstoffbahnen
US3455780A (en) * 1966-07-11 1969-07-15 Cons Paper Inc Suction cylinder mold partially wrapped by and endless,porous control member
FI68275C (fi) * 1972-12-07 1985-08-12 Valmet Oy Banformningsfoerfarande vid en upptagnings- och torkningsmaskin foer cellulosa
US4235667A (en) * 1979-04-09 1980-11-25 Beloit Corporation Method of and means for attaining uniformity in paper webs produced on a roll former
JPS612718Y2 (fr) * 1981-03-28 1986-01-28
DE3138133C2 (de) * 1981-09-04 1986-03-06 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Entwässerungseinheit für Langsieb-Papiermaschinen
FI75376C (fi) * 1982-04-30 1988-06-09 Valmet Oy Formningssko foer formare i pappersmaskin.
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
JPS61119795A (ja) * 1984-11-15 1986-06-06 三菱重工業株式会社 ツインワイヤフオ−マ
DE3830683A1 (de) * 1987-10-30 1989-05-11 Escher Wyss Gmbh Doppelsiebformer
DE3927597A1 (de) * 1989-08-22 1991-02-28 Voith Gmbh J M Doppelsieb-former
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DE4014403C2 (de) * 1990-05-04 1994-03-10 Escher Wyss Gmbh Vertikalformer
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US5211814A (en) * 1991-05-31 1993-05-18 Valmet Paper Machinery Inc. Wire loading device in a paper machine

Also Published As

Publication number Publication date
CA2113673C (fr) 2000-03-14
DE59309760D1 (de) 1999-10-07
CA2113673A1 (fr) 1994-07-19
DE4301103C1 (de) 1994-08-18
EP0607549A1 (fr) 1994-07-27
FI940155A7 (fi) 1994-07-19
US5480520A (en) 1996-01-02
FI940155A0 (fi) 1994-01-12
JPH06235185A (ja) 1994-08-23
ATE184062T1 (de) 1999-09-15

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