EP0416219B1 - Lame pour la section de formage d'une machine à papier - Google Patents

Lame pour la section de formage d'une machine à papier Download PDF

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Publication number
EP0416219B1
EP0416219B1 EP90110333A EP90110333A EP0416219B1 EP 0416219 B1 EP0416219 B1 EP 0416219B1 EP 90110333 A EP90110333 A EP 90110333A EP 90110333 A EP90110333 A EP 90110333A EP 0416219 B1 EP0416219 B1 EP 0416219B1
Authority
EP
European Patent Office
Prior art keywords
pressure
wires
pressing
supporting part
guide surface
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
EP90110333A
Other languages
German (de)
English (en)
Other versions
EP0416219A1 (fr
Inventor
Alfred Dr. Bubik
Herbert Holik
Otto Hildebrand
Karl Müller
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.)
Voith Sulzer Papiermaschinen GmbH
Original Assignee
Sulzer Escher Wyss GmbH
Escher Wyss GmbH
Voith Sulzer Papiermaschinen 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
Application filed by Sulzer Escher Wyss GmbH, Escher Wyss GmbH, Voith Sulzer Papiermaschinen GmbH filed Critical Sulzer Escher Wyss GmbH
Publication of EP0416219A1 publication Critical patent/EP0416219A1/fr
Application granted granted Critical
Publication of EP0416219B1 publication Critical patent/EP0416219B1/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
    • 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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus
    • D21F1/483—Drainage foils and bars
    • D21F1/486—Drainage foils and bars adjustable
    • 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 bar for the sheet formation zone of a paper machine of the type specified in the preamble of claim 1.
  • the suspension introduced between the sieves is subjected to pressures which change in the machine direction, the aqueous part of the suspension being drawn off by the sieves and a sheet being formed between the sieves.
  • the pressure changes are necessary to avoid flocculation of fibers and favorable to achieve good sheet formation.
  • pressing units are usually provided below and above the sieves, which are equipped with strips arranged one behind the other and transversely to the machine running direction.
  • Such constructions are e.g. known from DE-OS 31 53 305, EP-A-0 160 615, DE 38 30 683 A1 and from DE patent application P 38 15 316.5.
  • FR-A-2 576 932 similar to DE-OS 35 03 242, describes a former with strips across the machine width that have guide surfaces for the sieve, which are combined and rest laterally on support parts via shape-adjustable pressing devices thereby adjustable against the sieves.
  • a sensitive adjustment is not possible.
  • the invention was based on the object of proposing a strip of the type specified at the outset, in which the pressure surges at the inlet in the region of the strip are kept low with a sensible design of the contour of the guide surface, which effect is also obtained during or after the adjustment of the strip during operation remains.
  • This should make it possible to use the bar as early as possible at low dry contents of the material to be treated, without the material web being pressed.
  • One goal is to achieve a good formation with the best possible quality and to see through the formed paper sheet by using the bar.
  • the adjustability should be ensured with relatively simple and reliable means of operation.
  • the intended distances between the respective screen and the guide surface are essentially retained in all points, so that the desired pressure changes during and after the adjustment of the pressure part such as desired.
  • the material web between the screens can be gently pressure treated without being damaged or impaired.
  • the strips according to the invention can be used in the sheet formation zone even at low dry contents of the material web. This is a good formation for a sheet of paper with a frosted glass-like view reachable. Adjustment of the bar is guaranteed with proven means.
  • strips 1 are provided. Each bar 1 is arranged transversely to the machine direction, which is indicated by an arrow. It is suitable for guiding screens 2 and 3, between which a material web 4 is formed by variable pressure treatment, starting from the strips.
  • the strips 1 can be adjusted relative to the sieves 2 and 3 and are supported on the part 12 of a pressing unit which can be positioned relative to the sieves or to the material web 4 in a manner resistant to bending.
  • the guide surface 5 of the bar 1 facing the sieves 2 and 3 has a useful contour in cross-section, by means of which shape steep pressure gradients on the inlet and outlet sides of the guide surface are to be avoided, a pressure increase being to be achieved on the inlet side.
  • support elements 14 are provided on the screens 2 and 3 in the example shown, which cooperate with the strips 1 during the pressure treatment of the material web 4.
  • the strip 1 has a support part 6 which is fastened to the part 12 and a pressure part 7 with the guide surface 5 with a meaningful contour.
  • the position of the pressure part is in the direction by means of a pressure device 8, which is supported on the support part 6 adjustable relative to sieves 2 and 3.
  • the pressure device has a pressure element 9 which can be acted upon by a pressure medium - gas or liquid - which is supported on the support part 6 and acts on the pressure part 7.
  • the pressure element 9 is a hose that can be acted upon with a pressure medium and thus deformable. This is embedded in the support part 6, so that its deformation caused by the action - in the case of a smaller or larger curvature - acts in cross-section on the printed matter for its positioning relative to the support part 6.
  • connection 10 is provided, which when the pressure part 7 is moved relative to the support part 6 with the aid of the pressing device 8, a simultaneous inclination of the pressure part 7 or its guide surface 5 corresponding to this movement relative to the sieves 2 or 3 and to the support part 6, the pivot axis running in the direction of the bar.
  • This connection can have a fulcrum 15, in which the pressure part can be rotated, as shown in FIG. 2.
  • a leaf spring at this point could also serve the same purpose.
  • the pressure part 7 made of a plastic, e.g. made of polyethylene, as shown in FIG. 1, the connection 10 may be made of the same material and part of the pressure part 7 and may have a kink, which then acts as the pivot point 15 mentioned above.
  • the pressure part 7 is made of a relatively soft and flexible plastic, it is recommended that an integrated abrasion-resistant layer, e.g. Ceramic insert, to be provided.
  • an integrated abrasion-resistant layer e.g. Ceramic insert
  • An example of this is shown in Fig. 2, where the ceramic insert is designated by 11.
  • the strips 1 in a pressing unit 12 for a twin wire former of a paper machine. Since they are arranged one behind the other in the machine running direction and so combined and fastened on a frame 13, as shown in Fig. 5.
  • the frame 13 is for positioning the bar arrangement can be raised and tilted relative to sieves 2 and 3.
  • Pressure bars 16 and guide 17 on the frame 13 serve this purpose.
  • the strips can be pushed in from the side of the frame 13.
  • T-guides 18 are used for this purpose, which can be seen particularly clearly in FIGS. 1 to 4.
  • the pressure parts 7 can be inserted separately from the support parts 6 to the support parts 6 from the side of the frame 13. This allows pressure parts with different guide surfaces to be used in accordance with different technological requirements and easily replaced.
  • the pressure parts 7 can thus be pressed against the screens 2 or 3.
  • the pressure generated between the sieves is absorbed by the support elements 14 on the opposite side.
  • By adjusting the position of the pressure part 7 can be adapted to the different suspension heights between the sieves.
  • the sieve in question is increasingly pressed in the direction of the support element 14. This causes the suspension between the screens to experience increased pressure.
  • the squeezed aqueous part of the suspension adheres to the sieve as a film and is transported at about the sieving speed into the inlet wedge between the guide surface and the sieve and also partially deflected back there. This creates a pressure increase in this area, which causes a gentle pretreatment of the suspension between the sieves.
  • Part of the film is carried as a sliding film between the screen and the guide surface and is pulled off at the end of the guide surface.
  • the pressure in the pressure element 9 can simply be increased.
  • the rising contour of the guide surface 5 in the machine running direction forms a pressure wedge with the sieve.
  • the contour of the guide surface which can be designed in a sensible manner can have straight, concave or convex sections.
  • the acute angle between the sieve and the contour section in question can be between 10 minutes and 20 degrees, the contour here also being stepped.
  • the actual contact surface the contour swept by the screen can be straight or curved - concave or convex.
  • the contour can also have one or more turning points. Only a few examples are shown in the drawing of all these possibilities for the sensible design of the contour of the guide surface 5. See the guide surfaces 5 in FIGS. 1 to 4.
  • the strips according to the invention can be used in a pressure unit acting from below as from above relative to the sieves. 3 and 4 show the latter possibility using examples.
  • the opposite side to the strips 1 can have any known contour or contours. It can be a flat, convex or concave fixed shoe or an open or closed forming roller or a suction roller.
  • the strips 1 can be used in all known forms. E.g. in the apparatuses known from DE - 38 30 683 A1.
  • the great advantage is that different treatment zones can be easily set along the sheet formation zone. E.g. it is often advantageous to set a softer forming zone at the beginning and a harder forming zone at the end.
  • the pressure gradient at the inlet to the strip and the pressure between the sieves can be set as desired for every dewatering requirement in the forming area, so that an optimal, uniform formation can be achieved.
  • the strips 1 can also be used in the front area of the sheet formation in the twin wire, where the material has a low dry content without the web being pressed. Sheet quality can thus be achieved beyond the previous level, e.g. the frosted glass-like view without loss of strength of the web.

Landscapes

  • Paper (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)

Claims (7)

  1. Barre (1) pour la zone de formation de feuilles d'une machine à papier à double toile, qui est disposée transversalement à la direction de circulation de la machine (flèche), de manière à résister à la flexion, et qui est réglable pour le guidage des toiles (2 et 3), entre lesquelles une bande de matériau (4) est formée en feuille, la barre (1) contenant une pièce de pression (7) pourvue d'une surface de guidage (5) tournée vers les toiles, et la pièce de pression (7) étant déplaçable au moyen d'un dispositif de pression (8) prenant appui contre une pièce d'appui, par rapport aux toiles et par rapport à la pièce d'appui, caractérisée en ce que la surface de guidage (5) forme un angle de 10 minutes à 20 degrés au point avant, vu dans le sens de circulation, de la rencontre avec le tamis (2 ou 3) et la barre (1) contient la pièce d'appui (6) reliée à la pièce de pression (7) qui est déplaçable par rapport à la pièce d'appui, au moyen d'un dispositif de pression (8) prenant appui contre la pièce d'appui (6), ce qui fait que par rapport aux toiles (2 ou 3) il se produit un levage et une inclinaison simultanés de la pièce de pression (7) autour d'un axe de pivotement s'étendant dans la direction de la barre (1) et afin que l'angle compris entre la pièce de pression (7) et les toiles (2 et 3) ainsi qu'entre la pièce de pression (7) et la pièce d'appui (6), soit modifié.
  2. Barre selon la revendication 1, caractérisée en ce que le dispositif de pression (8) comporte un élément de pression (9), soumis à un fluide sous pression, lequel élément prend appui contre la pièce d'appui (6) et agit sur la pièce de pression (7).
  3. Barre selon la revendication 2, caractérisée en ce que l'élément de pression (9) est un tuyau alimenté en un fluide sous pression et déformable, qui est noyé dans la pièce d'appui (6), sa déformation agissant sur la pièce de pression (7).
  4. Barre selon la revendication 1, caractérisée en ce que la pièce de pression (7) est réalisée dans une matière plastique, par exemple en polyéthylène, et est pourvue d'une garniture céramique (11) intégrée, sur une partie de la surface de guidage (5).
  5. Unité de pression (12) pour un former à deux toiles d'une machine à papier, caractérisée par l'utilisation d'un certain nombre de barres (1) selon la revendication 1, qui sont placées les unes derrière les autres dans le sens de circulation de la machine et qui sont réunies sur un bâti (13), lequel peut être relevé et incliné en vue du positionnement par rapport aux toiles (2 et 3).
  6. Unité de pression (12) selon la revendication 5, caractérisée en ce que les barres (1) peuvent être introduites à partir du côté du bâti (13) et en ce que les pièces de pression (7) peuvent être introduites vers les pièces d'appui (6).
  7. Unité de pression pour un former à deux toiles d'une machine à papier, caractérisée par l'utilisation d'un certain nombre de barres (1) selon la revendication 1, qui sont disposées les unes derrière les autres dans le sens de circulation de la machine de manière à pouvoir guider à peu près horizontalement les toiles (2 et 3).
EP90110333A 1989-09-02 1990-05-31 Lame pour la section de formage d'une machine à papier Expired - Lifetime EP0416219B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3929265A DE3929265C2 (de) 1989-09-02 1989-09-02 Leiste für Blattbildungszone einer Papiermaschine
DE3929265 1989-09-02

Publications (2)

Publication Number Publication Date
EP0416219A1 EP0416219A1 (fr) 1991-03-13
EP0416219B1 true EP0416219B1 (fr) 1994-11-30

Family

ID=6388552

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90110333A Expired - Lifetime EP0416219B1 (fr) 1989-09-02 1990-05-31 Lame pour la section de formage d'une machine à papier

Country Status (7)

Country Link
US (1) US5061347A (fr)
EP (1) EP0416219B1 (fr)
AT (1) ATE114753T1 (fr)
CA (1) CA2022182A1 (fr)
DE (1) DE3929265C2 (fr)
ES (1) ES2066906T3 (fr)
FI (1) FI903374A0 (fr)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4107653A1 (de) * 1991-03-09 1992-09-10 Escher Wyss Gmbh Entwaesserungseinrichtung fuer die nasspartie einer papiermaschine
FI90673C (fi) * 1991-06-26 1994-03-10 Valmet Paper Machinery Inc Paperikoneen kaksiviirainen rainanmuodostusosa
US5147508A (en) * 1991-10-11 1992-09-15 The Nash Engineering Company Suction box covers for cleaning papermaking machine felts
US5169500A (en) * 1991-10-15 1992-12-08 Wilbanks International Adjustable angle foil for paper making machine with rigid foil body and cam actuation means
WO1994009207A2 (fr) * 1992-10-14 1994-04-28 Valmet Paper Machinery Inc. Dispositif de formation a double fil avec boites d'aspiration pour le drainage simultane
JP3572084B2 (ja) * 1992-10-29 2004-09-29 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
JPH08511589A (ja) * 1994-04-12 1996-12-03 ジェイダブリュアイ リミテッド ２枚のカンバスを用いた抄紙機における地合形成部
FI104192B (fi) * 1994-05-03 1999-11-30 Valmet Paper Machinery Inc Vyöhykesäädettävä kuormituslaatikko paperi- tai kartonkikoneen formeria varten
FI95935C (fi) * 1995-03-01 1996-04-10 Valmet Corp Paperikoneen vedenpoistolaitteen lista
DE29504419U1 (de) * 1995-03-15 1995-05-11 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Leisteneinheit zur nachgiebigen Unterstützung eines Siebbandes einer Papiermaschine
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
FI3066U1 (fi) * 1996-06-18 1997-09-30 Valmet Corp Paperikoneen vedenpoistolaitteen listasto
JP3422649B2 (ja) * 1997-04-15 2003-06-30 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
JP3664857B2 (ja) * 1997-09-05 2005-06-29 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
CZ20021719A3 (cs) 1999-11-17 2002-10-16 Astenjohnson, Inc. Upevňovač čepele pro sekci s dvojitou formovací tkaninou
JP2004510898A (ja) * 2000-10-16 2004-04-08 ヴァン　エッセン、ロイ 活性を調節できる脱水ボックス
US6709254B2 (en) 2000-10-27 2004-03-23 Kimberly-Clark Worldwide, Inc. Tiltable web former support
US6372093B1 (en) 2001-04-26 2002-04-16 Wilbanks International, Inc. Adjustable foil apparatus for papermaking machine
DE10327424A1 (de) * 2003-06-18 2005-02-10 Voith Paper Patent Gmbh Vorrichtung zur Verbesserung der Eigenschaften einer in einer Blattbildungsvorrichtung hergestellten Faserstoffbahn
AT503404A1 (de) * 2006-04-13 2007-10-15 Bartelmuss Klaus Ing Verfahren zur steuerung der temperatur der keramischen elemente einer abstütz- bzw. abstreifleiste in einer anlage zur papiererzeugung sowie einrichtung und abstütz- bzw. abstreifleiste zur durchführung dieses verfahrens
US10246825B2 (en) 2016-03-17 2019-04-02 Andritz Inc. Supporting mechanism for a papermaking machine dewatering blade

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FR1260472A (fr) * 1960-06-22 1961-05-05 Lodding Engineering Corp Supports réglables pour tamis fourdrinier
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CA1245900A (fr) * 1984-05-18 1988-12-06 Norman A. Stock Sabot de formation vibrant pour formeurs a double toile
JPS6189398A (ja) * 1984-10-03 1986-05-07 三菱重工業株式会社 紙層形成装置
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DE3830683A1 (de) * 1987-10-30 1989-05-11 Escher Wyss Gmbh Doppelsiebformer
DE3815316C2 (de) * 1988-05-05 1996-02-01 Voith Sulzer Papiermasch Gmbh Vorrichtung zur Entwässerung an einem Doppelsieb-Former
DE8807850U1 (de) * 1988-06-16 1988-08-04 Gustav Reinhard GmbH & Co. KG, 5870 Hemer Entwässerungseinheit für Langsieb-Papiermaschinen

Also Published As

Publication number Publication date
DE3929265C2 (de) 1997-05-07
ES2066906T3 (es) 1995-03-16
DE3929265A1 (de) 1991-03-28
ATE114753T1 (de) 1994-12-15
CA2022182A1 (fr) 1991-03-03
EP0416219A1 (fr) 1991-03-13
FI903374A0 (fi) 1990-07-04
US5061347A (en) 1991-10-29

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