EP0454989B1 - Section de formage vertical - Google Patents

Section de formage vertical Download PDF

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Publication number
EP0454989B1
EP0454989B1 EP91104493A EP91104493A EP0454989B1 EP 0454989 B1 EP0454989 B1 EP 0454989B1 EP 91104493 A EP91104493 A EP 91104493A EP 91104493 A EP91104493 A EP 91104493A EP 0454989 B1 EP0454989 B1 EP 0454989B1
Authority
EP
European Patent Office
Prior art keywords
forming
accordance
suction
vertical former
formation
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
EP91104493A
Other languages
German (de)
English (en)
Other versions
EP0454989A1 (fr
Inventor
Alfred Dr. Bubik
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.)
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 EP0454989A1 publication Critical patent/EP0454989A1/fr
Application granted granted Critical
Publication of EP0454989B1 publication Critical patent/EP0454989B1/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 vertical former of a paper machine according to the preamble of claim 1.
  • Such a vertical former is known from US Pat. No. 4,790,909.
  • curved suction boxes are arranged one after the other in the running direction after a forming roller, with one suction box on one side and the other suction box offset in the running direction on the other side of the twin wire in order to achieve symmetrical dewatering and thus a symmetrical sheet structure.
  • the drainage takes place at different times, so that the two side areas without a forming element produce a different formation structure.
  • the screens are not guided over long distances, which leads to a wave formation of the screens across the web width and to streaky paper.
  • Fl-PS 843 081 shows a vertical former in which a suction former is arranged directly over a vacuum shoe with a certain radium and opposite pressure bars. Another suction box is arranged behind the first-mentioned suction box in the running direction. This results in an uneven distribution of the drainage quantities and an asymmetrical path structure is achieved. Due to the radius of the vacuum shoe and the engagement of the rigid strips directly on top of each other, a very strong initial drainage is achieved, which leads to deformations in the web leads.
  • the invention has for its object to provide a vertical former of the type mentioned, in which an improved formation in connection with an improved web strength and in particular a more uniform web structure can be achieved without streaking.
  • An open forming roll is expediently connected upstream of the formation section.
  • an open forming roller can also be connected downstream of the formation section.
  • These forming rollers are preferably designed as suction rollers.
  • an improved formation in connection with an improved web strength and in connection with a more uniform web structure and smoothness on the surface can be achieved.
  • the formation according to the invention is particularly suitable, also for web weights 80 g / m2.
  • the device according to the invention can also be used in conjunction with a multi-layer headbox with targeted detection of the white water. Finally, better retention of the fibers is possible during the dewatering process.
  • the suction boxes can expediently have one, two or more suction zones.
  • the water builds up in the suction box parts and the vacuum is present above the water surface.
  • the vacuum in the different suction zones can be different. If one looks at the negative pressure curve within a part of the suction box along a section transverse to the drainage strips, the vacuum is greatest at the top due to the accumulated water and decreases from the top to the bottom as viewed in the direction of rotation of the twin wire. This effect is very favorable because it allows the dewatering effect to be dosed so that at the beginning, where the substance drains more easily, the negative pressure applied is lower. This affects the formation favorably.
  • a continuous development of the vacuum can also be achieved with a finite subdivision of the suction box.
  • the rear formation zone in the running direction of the twin wire can expediently be longer than the front formation zone. This leads to a particularly gentle formation, in particular when the formation shoe of the suction box at the front in the running direction of the twin wire is expediently not curved, i.e. is essentially straight. As a result, the track is treated carefully in the first phase of formation and drainage.
  • the vertical former as is shown schematically in FIG. 1, comprises two screens S1 and S2, which converge to form a twin screen in the area of a nozzle 10 which feeds the suspension.
  • This twin wire passes through a formation section or a formation gate 12.
  • the twin wire DS is guided around a forming roller 14.
  • the screen S1 is guided around deflecting rollers 16 or at the inlet around a closed breast roller 14 '.
  • This forming roller 14 is designed as an open forming roller.
  • the screen S2 is guided around deflection rollers 16 'or 16'', wherein between the breast roll 14 'and the deflection roll 16'', the screens S1 and S2 converge to form the double screen DS.
  • the nozzle 10 is directed into this merging nip in order to introduce the aqueous suspension into the nip where a first dewatering takes place.
  • the formation section 12 or the formation section 12 is here divided into two zones, namely a first forming zone Z1 and a second forming zone Z2, the course of the twin wire DS taking place essentially vertically, with a maximum inclination of 30 ° to the vertical.
  • the first formation zone Z1 is preferably shorter than the second formation zone Z2.
  • several zones can also be provided in succession. It is important that a forming element is arranged opposite each other on the opposite ends of the twin wire DS in each zone, specifically in the first formation zone Z1 on the right-hand side pressure bars 18, which are preferably elastic and, if appropriate, adjustable, elastic to the twin wire or to the Sieve S2 in the area of the double sieve DS are pressed to discharge the extracted water via a discharge box 18 '.
  • the forming section or the formation section 12 is drawn out in detail.
  • the nozzle 10 slants the suspension from bottom left to top right into the space between the rollers 14 and 16 ", which affects the initial dewatering process in a modified form.
  • the suction box 19 is designed here in one stage with a deflection element 19 ′′ and the suction box 21 in two stages with the deflection elements 21 ′′. A clearer representation of this two-stage suction box 21 with the water accumulation 22 can be seen more clearly in FIG. 5, attached drawing.
  • 3 and 4 each show a double-wire belt curve curved to the left and to the right in the formation section 12, although the formation shoe 19 'is preferably straight in the first formation stage Z1 in order to be able to carry out a more gentle drainage in the first stage.
  • the formation shoe 21 'straight in the second zone Z2 the two formation stages Z1 and Z2 then being arranged at a slight angle to one another.
  • the nozzle 10 is oriented so that it directs the suspension from bottom right to top left into the gap where the screens S1 and S2 converge to form the twin screen DS. In this case, the screen S2 is guided around the open forming roller 14 '.
  • a three-stage suction box 26 is shown, with a formation shoe 26 ', which is just formed here.
  • the twin wire belt course is indicated by an arrow 27. From the water levels in the drainage water outlet 28 it can be seen that the uppermost section 29 has a higher negative pressure than in the section 30 below and the section 31 still underneath. This means that the suction pressure in the suction box sections corresponds to the direction of movement 27 from bottom to top increases, which also has a positive influence on gentle drainage with regard to an improved formation taking into account the desired web strength and in particular a uniform web structure.
  • troughs can be provided for collecting the water extracted from the forming breast rollers 14 '.
  • a suction box for sub-separation can be provided under the screen S2 after the open forming roll 14.

Landscapes

  • Paper (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Producing Shaped Articles From Materials (AREA)

Claims (11)

  1. Formeur vertical d'une machine à papier, en particulier pour la production de papiers d'impression sans fibres de bois et de "papier liner" et ou de "testliner", avec une double toile filtrante (DS) dont les deux toiles (S1, S2) sont entraînées conjointement avec la suspension de pâte en traversant une section de formation (12) essentiellement verticale, la section de formation (12) étant constituée d'au moins deux zones de formation (Z1, Z2) dans chacune desquelles est disposé un élément formeur (19, 21), ces éléments étant disposés à la suite l'un de l'autre dans le sens de circulation de la double toile (DS) en alternant de bas en haut d'un côté à l'autre de ladite double toile dans son sens de circulation et agissant sur l'une ou l'autre des toiles, et les éléments formeurs(19, 21) étant des caissons d'aspiration avec un patin de formation (19', 21') qui est ajusté contre la double toile (DS) avec la grille constituée par des lattes formeuses, caractérisé, en ce que, par rapport à un des éléments formeurs (19, 21), d'autres éléments formeurs (18, 20) sont disposés à la suite l'un de l'autre dans le sens de circulation en étant chaque fois opposés auxdits éléments précités (19, 21) sur le côté opposé de la double toile (DS), les autres éléments formeurs (18, 20) étant des lattes de pression.
  2. Formeur vertical selon la revendication 1, caractérisé en ce que le caisson d'aspiration (21) présente au moins deux zones d'aspiration.
  3. Formeur vertical selon la revendication 2, caractérisé en ce que des dépressions de grandeurs différentes règnent dans les zones d'aspiration (29, 30, 31) en décroissant de haut en bas.
  4. Formeur vertical selon la revendication 1, caractérisé en ce que la zone de formation (Z2) postérieure dans le sens de circulation de la double toile est plus longue que la zone de formation (Z1) antérieure.
  5. Formeur vertical selon la revendication 1, caractérisé en ce que le patin de formation du caisson d'aspiration (19) antérieur dans le sens de circulation de la double toile est essentiellement rectiligne.
  6. Formeur vertical selon la revendication 1, caractérisé en ce que les lattes de pression (18, 20) peuvent être pressées élastiquement.
  7. Formeur vertical selon la revendication 1, caractérisé en ce qu'un cylindre formeur d'entrée ouvert (14') est disposé en amont du trajet de formation (12).
  8. Formeur vertical selon la revendication 1, caractérisé en ce qu'un cylindre formeur ouvert (14) est disposé à la suite du trajet de formation (12).
  9. Formeur vertical selon la revendication 7, caractérisé en ce que le cylindre formeur d'entrée ouvert (14') est un cylindre aspirant.
  10. Formeur vertical selon la revendication 8, caractérisé en ce que le cylindre formeur ouvert (14) est un cylindre aspirant.
  11. Formeur vertical selon la revendication 1, caractérisé en ce qu'un aspirateur à fentes sous vide est disposé avant le premier élément formeur (18).
EP91104493A 1990-05-04 1991-03-22 Section de formage vertical Expired - Lifetime EP0454989B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4014403 1990-05-04
DE4014403A DE4014403C2 (de) 1990-05-04 1990-05-04 Vertikalformer

Publications (2)

Publication Number Publication Date
EP0454989A1 EP0454989A1 (fr) 1991-11-06
EP0454989B1 true EP0454989B1 (fr) 1995-03-15

Family

ID=6405738

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91104493A Expired - Lifetime EP0454989B1 (fr) 1990-05-04 1991-03-22 Section de formage vertical

Country Status (4)

Country Link
EP (1) EP0454989B1 (fr)
AT (1) ATE119956T1 (fr)
CA (1) CA2040999A1 (fr)
DE (2) DE4014403C2 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI93032C (fi) * 1991-03-15 1995-02-10 Valmet Paper Machinery Inc Paperikoneen kaksiviirainen rainanmuodostusosa
FI920228A0 (fi) * 1992-01-17 1992-01-17 Valmet Paper Machinery Inc Banformningsparti foer pappersmaskin.
DE4301103C1 (de) * 1993-01-18 1994-08-18 Voith Gmbh J M Siebpartie einer Papiermaschine
FI96623C (fi) * 1994-08-31 1996-07-25 Valmet Paper Machinery Inc Kaksiviiraformeri, etenkin nopeille paperikoneille
AT401185B (de) * 1994-10-14 1996-07-25 Andritz Patentverwaltung Vorrichtung zur entwässerung und bzw. oder wäsche von suspensionen, insbesondere faserstoffsuspensionen
DE19651241A1 (de) * 1996-12-10 1998-06-18 Voith Sulzer Papiermasch Gmbh Doppelsieb-Blattbildungseinrichtung
DE19652485A1 (de) * 1996-12-17 1998-06-18 Voith Sulzer Papiermasch Gmbh Siebpartie und Verfahren zum Entwässern einer Faserstoffbahn in einer Siebpartie
FI109299B (fi) * 2001-01-22 2002-06-28 Metso Paper Inc Kaksiviiraformeri
DE20104380U1 (de) 2001-03-13 2001-06-28 Voith Paper Patent GmbH, 89522 Heidenheim Doppelsiebformer
DE10161056A1 (de) 2001-12-12 2003-06-26 Voith Paper Patent Gmbh Siebpartie
DE102005000014A1 (de) * 2005-02-24 2006-08-31 Voith Paper Patent Gmbh Doppelsiebformer zur Herstellung einer Faserstoffbahn aus mindestens einer Faserstoffsuspension
DE102008040948A1 (de) 2008-08-01 2010-02-04 Voith Patent Gmbh Doppelsiebformer für eine Maschine zur Herstellung einer Faserstoffbahn

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT327670B (de) * 1970-10-30 1976-02-10 Arledter Hanns F Dr Ing Entwasserungseinrichtung fur eine doppelsieb-papiermaschine
AT328283B (de) * 1970-11-16 1976-03-10 Arledter Hanns F Dr Ing Verfahren und einrichtung zur herstellung vonfaserstoffbahnen mit raumlich ausgerichteten fasern
CA960496A (en) * 1971-03-25 1975-01-07 Beloit Corporation Vertical twin wire web forming arrangement
DE8405243U1 (de) * 1984-02-21 1986-07-31 O. Dörries GmbH, 5160 Düren Vorrichtung zum Führen der Siebe einer Doppelsiebpartie einer Papier- oder Kartonmaschine
US4790909A (en) * 1986-12-17 1988-12-13 Beloit Corporation Two-wire paper forming apparatus
SE456590B (sv) * 1987-09-07 1988-10-17 Ahlstroem Valmet Anordning for styrning av viror i en pappersmaskin eller kartongmaskin
DE3815470A1 (de) * 1988-05-06 1989-11-16 Voith Gmbh J M Doppelsieb-former

Also Published As

Publication number Publication date
DE4014403C2 (de) 1994-03-10
EP0454989A1 (fr) 1991-11-06
CA2040999A1 (fr) 1991-11-05
DE59104927D1 (de) 1995-04-20
ATE119956T1 (de) 1995-04-15
DE4014403A1 (de) 1991-11-07

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