EP0486814B1 - Partie humide pour machine à papier à deux toiles - Google Patents

Partie humide pour machine à papier à deux toiles Download PDF

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Publication number
EP0486814B1
EP0486814B1 EP91117629A EP91117629A EP0486814B1 EP 0486814 B1 EP0486814 B1 EP 0486814B1 EP 91117629 A EP91117629 A EP 91117629A EP 91117629 A EP91117629 A EP 91117629A EP 0486814 B1 EP0486814 B1 EP 0486814B1
Authority
EP
European Patent Office
Prior art keywords
wire
twin
making machine
machine according
paper
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
EP91117629A
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German (de)
English (en)
Other versions
EP0486814A1 (fr
Inventor
Alfred Dr. Bubik
Heinz Braun
Hans Dr. Dahl
Thomas Schaible
Helmut Störr
Karl Müller
Heinz Steckenreuter
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
Voith Sulzer Papiermaschinen GmbH
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Publication of EP0486814A1 publication Critical patent/EP0486814A1/fr
Application granted granted Critical
Publication of EP0486814B1 publication Critical patent/EP0486814B1/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 the wet part of a twin-wire paper machine according to the preamble of claim 1.
  • Such machines are generally used to produce a paper or cardboard web, which is formed by dewatering a fiber suspension between two screens.
  • US Pat. No. 4,925,531 shows a known twin-wire former of this type, in which a paper web is formed by direct introduction of the suspension jet from the headbox into the space formed when the two wires come together. The water passing through the top sieve is thrown into a water container due to the centrifugal force of the water. This procedure requires relatively high speeds and paper webs that are not too thick.
  • twin-wire paper machines As is known, there are a very large number of different designs of twin-wire paper machines.
  • the patent specification of the applicant DE 31 38 133 C2 schematically shows paper machines in FIGS. 1, 2 and 3, in which the production of a paper or cardboard web is made possible with the aid of a bottom and top screen.
  • German laid-open specification 39 10 892 A2 shows the formation area of a twin-wire paper machine with a forming roller in the lower wire and an area of the twin wire running upwards over a curved forming shoe.
  • twin-wire paper machines of this type have the disadvantage that the range in which they can be operated is limited by the fact that such machines cannot be operated at speeds below a certain limit and then only with relatively low basis weights, for example Newsprint.
  • Such known machines have the property that the centrifugal force occurring at the forming roll at speeds, in particular below 500 m / per minute, is too low to fling the water sufficiently upwards and to remove it in the collecting channel provided for this purpose. This is further complicated by the fact that such machines have an increasing profile of the sieves in the machine running direction.
  • L / Q tear length ratio
  • Another paper machine does not have a forming roller in the lower wire. Furthermore, the first suction box is arranged to rise in the bottom wire viewed in the machine running direction. This allows the water passing through the top wire to run back against the machine direction, especially at low machine speeds. There is no upper apex of the bottom wire in the front area of the sheet formation here either.
  • the invention has for its object to provide a twin-wire paper machine that can be used in a wide speed range and with a wide variety of basis weights.
  • the former is intended for web weights of between 30 and 300 g / per square meter and at speeds of 200 can be used up to over 1000 m / per minute.
  • the solution to this problem is achieved in full by the measures mentioned in the characterizing part of claim 1.
  • the wet part of the paper machine is designed in such a way that in the area of the twin-wire loop forming on the forming roll, a favorable formation takes place with effective dewatering of the web.
  • the geometric conditions in this area such as the relatively large wrap angle of the forming roller through both screens of approximately 45 ° and the rapid, unimpeded water drainage play a positive role. This is achieved when the forming section arranged after the forming roller leads downwards at least partially following gravity.
  • the losses in the flow caused by the boxes in the lower and upper sieves are compensated for by the fact that the suspension between the sieves is accelerated by gravity.
  • both screens are either guided horizontally, falling or slightly rising over one or more curved surfaces, the web being further formed by the suction effect of the at least one suction box in the bottom wire and the vacuum suction box in the top wire.
  • the forming roller 1 represents an important exemplary embodiment of the wet part of a paper machine according to the invention, here with a headbox 10 from which a material suspension jet emerges, which passes directly between the two merged screens, top screen 8, bottom screen 9.
  • the forming roller 1 is wrapped in a region by both sieves, in a region in front of it only by the lower sieve 9. Both screens from the forming roller run in the upper right area.
  • the forming roller can have a grill structure which is attached to a closed jacket body. The white water can be stored and then centrifugally thrown off the roller.
  • the forming roller can also be designed as a suction roller.
  • the radius of the forming roller can be between 0.3 and 1 m.
  • both screens 8 and 9 are transported horizontally, falling or slightly rising via a suction box 2 - or even several - with, for example, a curved surface provided with transverse strips.
  • the radius of curvature here is between 2 and 20 m.
  • the suction box has a straight piece, for example in the last part, so that the directional reversal of the two screens is as gentle as possible without the fleece or the web being damaged.
  • the open area of the box can be between 20 and 80%.
  • the boxes can be covered with strips Machine width and / or be provided with a hole pattern.
  • the vacuum suction box 4 in the top sieve consists of several chambers that can be acted upon differently by vacuum.
  • An inclination, as shown here, falling in the running direction, of the box 4 facilitates the water drainage in the initial area of this suction box, especially at low machine speeds of e.g. 200 m / minute.
  • centrifugal action above the suction box 2 located in the lower sieve allows water to be easily removed by means of individual, additional top suction devices 3.
  • separating element 5 Behind the vacuum box 4 is a separating element 5, which in the case shown in FIG. 1 is a curved box with strips extending across the width, with a radius of curvature between 1.5 and 20 m. In other cases, however, this box can also be straight and can be subjected to negative pressure. A register roller is also conceivable as the separating element 5.
  • Fig. 2 shows very schematically and without details another possible course of the merged screens between the forming roller 1 and the vacuum box 4, the contour of the suction box 2 first having a slightly rising and then a more sloping shape.
  • Fig. 3 shows that suction boxes 2 and vacuum suction box 4 can not only have curved, but also straight contours of the surfaces touched by the screens, whereby a particularly gentle drainage and thus favorable formation, especially with relatively heavy web weights, can be achieved. It is possible, as shown here, to first choose the flat and then the curved shape on the surface of the suction boxes that comes into contact with the screen, but the reverse order can also be advantageous, depending on the requirements and geometric conditions.
  • FIG. 4 shows a further example of an arrangement with a suction box 2 'located in the lower sieve, which has a curved shape on the surface in contact with the sieve and which is followed by a second suction box 2' 'with a surface straight to the sieve.
  • the vacuum box 4 located in the upper sieve is divided into several areas, namely 4 'and subsequently 4' ', which are subjected to different negative pressures and are provided with an upstream extra suction device 4' ''.
  • FIGS. 5 and 6 are provided with a four-wire section located before the two screens 8 and 9 are brought together.
  • the headbox 10 is located at the beginning of this Fourdrinier section which contains part of the lower wire 9.
  • Such arrangements are also called hybrid formers.
  • a deflecting roller located in the front of the top wire can also be formed as a forming cylinder 11, as shown in FIG. 6.

Landscapes

  • Paper (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)

Claims (21)

  1. Partie humide d'une machine à papier à deux toiles tournant sans fin, en particulier une toile supérieure (8) et une toile inférieure (9), la partie portant la bande de la toile inférieure (9) s'étendant par portions sensiblement horizontalement, lesquelles toiles sont réunies en une zone, et comprenant :
    a) un cylindre de formage (1) ouvert dans la toile inférieure (9), qui est en partie entouré par deux toiles,
    b) au moins une caisse de tête (10) de laquelle la suspension de matières fibreuses ressort en un jet large et peut parvenir dans la zone comprise entre deux toiles réunies, dans laquelle la suspension ou la bande est déshydratée,
    c) au moins une caisse d'aspiration (2) dans la toile inférieure, et
    d) à la suite, au moins un élément de séparation (5) dans la toile inférieure, en particulier aspirateur de séparation ou rouleau de séparation,
       caractérisée en ce qu'est prévu au moins un aspirateur top (3), placé dans la toile supérieure, dont la zone efficace commence à l'intérieur du rouleau de formage (1), dont l'angle est identique à l'angle d'enroulement, qui est formé par les deux toiles sur le rouleau de formage (1), ainsi qu'à la suite au moins une caisse d'aspiration sous vide (4) dans la toile supérieure, à laquelle fait suite un élément de séparation (5).
  2. Partie humide d'une machine à papier à deux toiles selon la revendication 1, caractérisée en ce que le point de sommet supérieur du rouleau de formage (1) est situé plus haut que la portion portant la bande, sensiblement horizontale, de la toile inférieure.
  3. Partie humide d'une machine à papier à deux toiles selon la revendication 1, caractérisée en ce que le point de sommet supérieur du rouleau de formage (1) est le point le plus haut de la toile inférieure.
  4. Partie humide d'une machine à papier à deux toiles selon la revendication 1, caractérisée en ce qu'au moins une autre caisse d'aspiration (2") se trouve dans la toile inférieure (9).
  5. Partie humide d'une machine à papier à deux toiles selon la revendication 1, caractérisée en ce qu'un rouleau d'aspiration (7) se trouve dans la toile inférieure (9).
  6. Partie humide d'une machine à papier à deux toiles selon la revendication 1, caractérisée en ce que la caisse d'aspiration (2) touche dans la toile inférieure (9), le point le plus haut de la toile inférieure (9).
  7. Partie humide d'une machine à papier à deux toiles selon la revendication 1, caractérisée en ce que la caisse à vide (2) dans la toile inférieure et/ou la caisse à vide (4) dans la toile supérieure (8) est courbée convexe vers la toile respective, au moins sur une partie de la surface touchée par la toile, vue dans le sens de circulation.
  8. Partie humide d'une machine à papier à deux toiles selon la revendication 1, caractérisée en ce que le bord avant de la caisse à vide (4), située dans la toile supérieure (8), est placé au-dessus du niveau de la portion sensiblement horizontale de la toile inférieure (9).
  9. Partie humide d'une machine à papier à deux toiles selon la revendication 1, caractérisée en ce que la longueur, vue dans le sens de circulation de la caisse à vide (4), se trouvant dans la toile supérieure (8) est supérieure à la longueur de la caisse à vide (2) se trouvant dans la toile inférieure (9).
  10. Partie humide d'une machine à papier à deux toiles selon la revendication 1, caractérisée en ce que sous la caisse à vide (4), se trouvant dans la toile supérieure, sont placés des éléments de pression (6) pouvant être pressés élastiquement contre la toile inférieure.
  11. Partie humide d'une machine à papier à deux toiles selon la revendication 1, caractérisée en ce que la surface active de l'élément de séparation (5) est placée entre le point de sommet supérieur et le point inférieur du rouleau de formage (1).
  12. Partie humide d'une machine à papier à deux toiles selon la revendication 1, caractérisée en ce que la caisse de tête est placée directement devant le rouleau de formage (1), de sorte qu'il en résulte ce qu'il est convenu d'appeler un gap-former.
  13. Partie humide d'une machine à papier à deux toiles selon la revendication 12, caractérisée en ce que la caisse de tête devant le rouleau de formage (1) est formée en caisse de tête multicouche.
  14. Partie humide d'une machine à papier à deux toiles selon la revendication 1, caractérisée en ce que devant le rouleau de formage se trouve une portion de toile sans fin avec la caisse de tête, de sorte qu'il en résulte ce qu'il est convenu d'appeler un former hybride.
  15. Partie humide d'une machine à papier à deux toiles selon les revendications 1, 2 ou 3, caractérisée en ce que la partie arrière, dans le sens de circulation de la toile, de la toile inférieure (9), s'étend sensiblement horizontalement.
  16. Partie humide d'une machine à papier à deux toiles selon la revendication 15, caractérisée en ce que la portion horizontale de la toile inférieure (9) se trouve derrière l'élément de séparation (5), vu dans le sens de circulation de la toile.
  17. Partie humide d'une machine à papier à deux toiles selon la revendication 1, caractérisée en ce que deux aspirateurs top (3', 3") se trouvent dans la toile supérieure (8) ainsi que deux caisses à vide (2', 2"), dans la caisse inférieure (9).
  18. Partie humide d'une machine à papier à deux toiles selon la revendication 17, caractérisée en ce que la première caisse à vide (2') est sensiblement plane, sur la surface touchée par la toile, et la deuxième caisse à vide (2") est convexe, vers la toile, sur la surface touchée par la toile.
  19. Partie humide d'une machine à papier à deux toiles selon la revendication 10, caractérisée en ce que la caisse d'aspiration sous vide (4), se trouvant dans la toile supérieure, présente au début une zone plane et ensuite une zone courbée convexe vers la toile, sur les surfaces touchées par la toile.
  20. Partie humide d'une machine à papier à deux toiles selon la revendication 1, caractérisée en ce que toute la longueur de toile, touchée par les caisses supérieures et caisses inférieures (2, 2', 4, 4', 4"), est supérieure à la longueur d'enroulement du rouleau de formage 1.
  21. Partie humide d'une machine à papier à deux toiles selon la revendication 1, caractérisée en ce que tout le parcours de formage, formé par les caisses de formage, dans la toile inférieure et la toile supérieure, tombe dans le sens de circulation.
EP91117629A 1990-11-20 1991-10-16 Partie humide pour machine à papier à deux toiles Expired - Lifetime EP0486814B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4037017A DE4037017C2 (de) 1990-11-20 1990-11-20 Naßteil einer Doppelsieb-Papiermaschine
DE4037017 1990-11-20

Publications (2)

Publication Number Publication Date
EP0486814A1 EP0486814A1 (fr) 1992-05-27
EP0486814B1 true EP0486814B1 (fr) 1996-05-29

Family

ID=6418641

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91117629A Expired - Lifetime EP0486814B1 (fr) 1990-11-20 1991-10-16 Partie humide pour machine à papier à deux toiles

Country Status (8)

Country Link
US (1) US5282933A (fr)
EP (1) EP0486814B1 (fr)
JP (1) JPH04263692A (fr)
AT (1) ATE138703T1 (fr)
CA (1) CA2055837A1 (fr)
DE (2) DE4037017C2 (fr)
ES (1) ES2087204T3 (fr)
FI (1) FI112386B (fr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4117597A1 (de) * 1991-05-29 1992-12-03 Voith Gmbh J M Doppelsiebformer fuer eine papiermaschine
US5573643A (en) * 1992-01-17 1996-11-12 Valmet Corporation Twin wire web former in a paper machine
FI920228A0 (fi) * 1992-01-17 1992-01-17 Valmet Paper Machinery Inc Banformningsparti foer pappersmaskin.
DE4208681A1 (de) * 1992-03-18 1993-09-23 Escher Wyss Gmbh Nassteil einer doppelsieb-papiermaschine
DE4219292A1 (de) * 1992-06-12 1993-12-16 Escher Wyss Gmbh Doppelsiebformer
PL171439B1 (pl) * 1992-08-19 1997-04-30 Beloit Technologies Inc Urzadzenie do wytwarzania wielowarstwowej wstegi PL PL PL PL PL
DE4301751C2 (de) * 1993-01-23 1996-10-31 Voith Gmbh J M Verfahren zum Ablösen einer laufenden Faserstoffbahn von zwei endlosen Siebbändern
DE4328024A1 (de) * 1993-08-20 1995-02-23 Voith Gmbh J M Doppelsieb-Blattbildner
DE4332162C2 (de) * 1993-09-22 1994-12-01 Voith Gmbh J M Doppelsiebformer einer Papiermaschine
DE4335304C2 (de) * 1993-10-16 1995-04-20 Voith Gmbh J M Verfahren zum Betreiben eines Doppelsiebformers
FI100542B (fi) * 1993-11-12 1997-12-31 Valmet Paper Machinery Inc Paperikoneen hybridiformeri, joka on varustettu MB-yksiköllä
FI105934B (fi) * 1994-06-17 2000-10-31 Valmet Paper Machinery Inc Paperikoneen hybridiformerin kaksiviiravyöhykkeen sisäänmeno
DE4443874C2 (de) * 1994-12-09 1996-10-31 Voith Sulzer Papiermasch Gmbh Doppelsieb-Gap-Former zur Papierherstellung
US5783045A (en) * 1996-05-06 1998-07-21 Beloit Technologies, Inc. Pulp and linerboard former with improved dewatering
DE10106731A1 (de) * 2001-02-14 2002-08-22 Voith Paper Patent Gmbh Doppelsiebformer zur Herstellung einer Faserstoffbahn aus einer Faserstoffsuspension
FI109814B (fi) * 2001-11-23 2002-10-15 Vaahto Oy Laitteisto paperi- tai kartonkirainan muodostamiseksi

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT359368B (de) * 1978-01-16 1980-11-10 Escher Wyss Gmbh Doppelsiebpapiermaschine
AT379622B (de) * 1980-11-26 1986-02-10 Escher Wyss Gmbh Papiermaschine mit zwei beweglichen wasserdurchlaessigen entwaesserungsbaendern, z.b. sieben
DE3153305C2 (de) * 1981-09-04 1986-10-23 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Entwässerungseinheit für Langsieb-Papiermaschinen
FI840246A (fi) * 1984-01-20 1985-07-21 Valmet Oy Foerfarande och anordning vid formning av pappersbana.
FI862808A (fi) * 1986-07-02 1988-01-03 Ahlstroem Oy Foerfarande och anordning foer avvattning av en fiberbana.
GB8710428D0 (en) * 1987-05-01 1987-06-03 Beloit Corp Multi-ply web forming apparatus
FI84734C (fi) * 1988-05-23 1992-01-10 Valmet Paper Machinery Inc Dubbelviraformare foer pappersmaskin.
DE3842155A1 (de) * 1988-12-15 1990-06-21 Voith Gmbh J M Doppelsiebformer zur herstellung einer papierbahn
GB8903517D0 (en) * 1989-02-16 1989-04-05 Beloit Corp A forming apparatus for forming a web from stock
DE3910892A1 (de) * 1989-04-04 1990-10-11 Escher Wyss Gmbh Doppelsiebformer

Also Published As

Publication number Publication date
ATE138703T1 (de) 1996-06-15
EP0486814A1 (fr) 1992-05-27
JPH04263692A (ja) 1992-09-18
FI915234A0 (fi) 1991-11-06
DE4037017A1 (de) 1992-05-21
CA2055837A1 (fr) 1992-05-21
DE4037017C2 (de) 1994-12-08
US5282933A (en) 1994-02-01
FI915234A (fi) 1992-05-21
DE59107858D1 (de) 1996-07-04
FI112386B (fi) 2003-11-28
ES2087204T3 (es) 1996-07-16

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