EP0803604B1 - Presse humide - Google Patents

Presse humide Download PDF

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Publication number
EP0803604B1
EP0803604B1 EP96106575A EP96106575A EP0803604B1 EP 0803604 B1 EP0803604 B1 EP 0803604B1 EP 96106575 A EP96106575 A EP 96106575A EP 96106575 A EP96106575 A EP 96106575A EP 0803604 B1 EP0803604 B1 EP 0803604B1
Authority
EP
European Patent Office
Prior art keywords
press
fibrous web
press nip
nip
belt
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
EP96106575A
Other languages
German (de)
English (en)
Other versions
EP0803604A1 (fr
Inventor
Andreas Meschenmoser
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 Patent GmbH
Original Assignee
Voith Paper Patent 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 Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Priority to EP96106575A priority Critical patent/EP0803604B1/fr
Priority to DE59606766T priority patent/DE59606766D1/de
Priority to AT96106575T priority patent/ATE200527T1/de
Priority to US08/650,126 priority patent/US5772849A/en
Publication of EP0803604A1 publication Critical patent/EP0803604A1/fr
Application granted granted Critical
Publication of EP0803604B1 publication Critical patent/EP0803604B1/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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • D21F3/045—Arrangements thereof including at least one extended press nip
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof

Definitions

  • the invention relates to a press for dewatering fibrous webs with two pressing elements, the pressing surfaces of which form a press nip are pressed against each other, the fibrous web together with at least one between the fibrous web and a respective one Pressing element running drainage belt through the press nip is guided and each drainage belt in the at the press nip outlet subsequent area is separated from the fibrous web.
  • the object of the invention is a press of the aforementioned Way of creating that for high web speeds is suitable and in which a rewetting of the fibrous web prevented at the press nip outlet or at least strongly is reduced.
  • a first both pressing elements a grooved or blind drilled surface and that second pressing elements has a smooth and closed surface, so that the drainage of the fibrous web (1) in the press nip predominantly the first press element is that the fibrous web at the press nip outlet is separated from the first pressing element and together with a Drainage belt in a subsequent to the press nip outlet Section over a predeterminable angular range on the second pressing element is that the thickness elasticity and / or absorbency of the a drainage belt is chosen so that with relaxation this drainage belt when leaving the press nip outlet forms a short suction zone adjoining the press nip outlet, and that the fibrous web immediately following this suction zone from which a drainage belt is separated.
  • the guide roller for the fibrous web and / or a support belt in the form of a felt or sieve that leads to a subsequent one Unit belongs, arranged as close as possible to the press nip through which the free move, that is, that of none Belt-supported section of the fibrous web up to the guide roller is reduced so that because of the most extensive Guiding the fibrous web the risk of web breaks and Web flutter reduced even at high speeds or the tension in the fibrous web is kept lower can be.
  • At least one side of the fibrous web between the dewatering belt and the fibrous web preferably has a separating screen low liquid storage capacity due to the Press nip is guided and the fibrous web after leaving of the press nip over a predeterminable distance on the Separating sieve is guided. This increases the risk of web breaks and web flutter even at high speeds reduced.
  • the separating screen can, since it is in the press nip against the fibrous web is pressed, be designed with little marking. There are but also applications in which an embossing of a fibrous web side targeted through the separating sieve, for example for papers for packaging or sleeves. The separating screen can then have corresponding markings.
  • predetermined one of the pressing elements to form a press nip Longitudinal extension with the other pressing element a wide in particular has a concave shape, pressing surface and a roller jacket made of a flexible material possesses that moves around a carrier and over at least one support element is supported on this, and the other Press element a complementary to the wide press surface Has pressing surface and preferably from a rotating cylindrical roller is formed.
  • the fibrous web between two drainage belts is passed through the press nip, is convenient Elasticity in thickness and / or the absorbency of the drainage belt on the side of the fibrous web on which the fibrous web from the dewatering belt or the separating screen should be taken, greater than the thickness elasticity and / or the absorbency of the drainage belt the opposite side of the fibrous web.
  • the press consists of two on top of each other arranged pressing elements 2 and 3, the pressing surfaces against each other can be pressed, through the press nip 4 next to the fibrous web 1 at least one between the fibrous web 1 and one of the pressing elements 2 and 3 arranged drainage belt 5 or 6 runs.
  • the bottom one Pressing element 3 from a rotating cylindrical roller be conventional or controlled by deflection can, formed.
  • the upper pressing element 2 can be a concave Form press surface, which is a flexible material existing roller jacket 10 around a (not shown) Carrier moves and on at least one support member 11 supports this carrier.
  • Press nips 4 there are other devices for forming Press nips 4 imaginable.
  • both pressing elements 2, 3 a wide press area and each a flexible Own coat.
  • the fibrous web 1 is removed in these exemplary embodiments via a suction roll 17 from an upstream Sieve section and it is delivered to the drying cylinder 18th a subsequent dryer section.
  • the exemplary embodiments have in common that the Drainage belts 5 and 6 after leaving the press nip 4 away from the fibrous web 1 as quickly as possible and in a section 12 on the corresponding pressing element 2 or 3 run along.
  • the drainage belts 5, 6 are otherwise as in the figures 1 to 5 can be seen, guided over felt guide rollers 13 and can in front of the press nip 4 to guide the fibrous web 1st be used.
  • Simply by using two drainage belts 5 and 6 can drainage capacity the extended nip press can be increased significantly.
  • the convex curvature of the upper press element allows 2 the immediate at the outlet of the concave press surface Moving the drainage belt 5 from the fibrous web 1 after the press nip 4 at least in a section 12 along the pressing element 2, which is a rewetting of the fibrous web 1 prevented from this drainage belt 5.
  • the fibrous web 1 runs in the case of those in FIGS and 2 shown presses after the press nip 4 approximately tangential to the lower press element 3 in one, albeit very short, Suction zone 14 on the underside of the fibrous web together with the lower drainage belt 6 along the cylindrical Press element 3.
  • Suction zone 14 there is a Relaxation of the elastic compared to the upper drainage band 5 lower drainage belt 6 and thus to one Aspiration of liquid from the fibrous web 1 in the lower drainage belt 6.
  • a guide roll 7 following the press nip 4 if possible to be arranged close to the press nip 4. This shortens the free one Length of the fibrous web 1 between the press nip 4 and the Guide roller 7 and thus acts to flutter and tear off the Fiber web 1 opposed.
  • the support band 8 is usually designed as a sieve and can also arranged on the other side of the fibrous web 1 his.
  • the press 2, 3 can at least a further pressing device 17, 18 with a press nip 4 ' be upstream.
  • the drainage belts go through 5, 6 together with the fibrous web in between 1 advantageously also the press nip 4 ' upstream pressing device, which makes the transport the fibrous web 1 between the upstream pressing device 17, 18 and the press 2, 3 simply designed.
  • At least one of the pressing elements 17, 18 is preferred the further pressing device a suction roll.
  • Figures 3 to 6 show long gap presses, in which between the drainage belt 6 of the lower pressing element 3 and the fibrous web 1 runs a separating screen 9, which here at least in a section before and after the press nip 4 is in contact with the fibrous web 1 and thereby the fibrous web 1 leads.
  • This guidance of the fibrous web 1 can, for example, take place up to the subsequent unit.
  • the suction zone 14 can in all versions with regard to their Expansion in the web running direction can be made variable, so that rewetting from the dewatering belt 6 is excluded becomes. This is possible by changing the course the fibrous web 1 after the press nip 4 via a change in position the corresponding guide roller and the adjustable Longitudinal tension in the separating sieve 9.
  • the drainage in the press nip 4 should predominantly to the other pressing element 2, which for example is achieved in that the concave pressing element 2 a grooved or blind drilled and the cylindrical press element 3 has a smooth surface.
  • the Scraper 15 in a region of the flexible roll shell 10 be arranged in which it does not have a slide bearing 16 is supported. This enables gentle scraping, because the scraper 15 at least slightly against the roller jacket 10 press in the air pressure prevailing in the roller jacket and can therefore be particularly effective.
  • the press 2, 3 upstream of a further pressing device 17, 18 be, which is traversed by the fibrous web 1.
  • the separating screen 9 also passes through the press nip 4 ' this upstream pressing device 17, 18 to the fibrous web 1 in a simple manner from the pressing device 17, 18 to the press 2, 3 to transport.
  • FIGs 7 and 8 show the press shown in Figure 5 with the proviso that only on the underside of the separating sieve 9 a drainage belt 6 is provided and the fibrous web 1 rests directly on the pressing element 2 on its upper side. In this case it is made directly with the fibrous web 1 coming into contact with the pressing element 2 a material repelling the fibrous web, in particular made of peeler rubber, for easy separation of the fibrous web 1 from the press roll 2 when leaving the press nip 4 to ensure.

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  • Paper (AREA)

Claims (13)

  1. Presse pour l'essorage de bandes de matière fibreuse (1) avec deux éléments de pressage (2, 3), dont les faces de pressage peuvent être pressées l'une contre l'autre en formant une fente de pressage (4), dans laquelle la bande de matière fibreuse (1) est conduite à travers la fente de pressage (4) en même temps qu'au moins une bande presse-pâte (5, 6) circulant entre la bande de matière fibreuse (1) et un élément de pressage respectif (2, 3) et chaque bande presse-pâte (5, 6) est séparée de la bande de matière fibreuse (1) dans la région succédant à la sortie de la fente de pressage (4), caractérisée en ce qu'un premier (2) des deux éléments de pressage (2, 3) possède une surface portant des stries ou des trous borgnes et le second élément de pressage (3) une surface lisse et fermée, de sorte que l'essorage de la bande de matière fibreuse (1) dans la fente de pressage se produise principalement vers le premier élément de pressage (2), en ce que la bande de matière fibreuse (1) est séparée du premier élément de pressage (2) à la sortie de la fente de pressage et est conduite en même temps qu'une bande presse-pâte (6) sur une région angulaire prédéterminable sur le second élément de pressage (3) dans un tronçon (12) succédant à la sortie de la fente de pressage, en ce que l'élasticité d'épaisseur et/ou le pouvoir absorbant de la première bande presse-pâte (6) est choisi(e) de telle façon qu'il se forme une courte zone absorbante (14) se raccordant à la sortie de la fente de pressage avec la décompression de cette bande presse-pâte (6) lorsqu'elle quitte la sortie de la fente de pressage, et en ce que la bande de matière fibreuse (1) est séparée de la première bande presse-pâte (6) immédiatement à la suite de cette zone absorbante (14).
  2. Presse suivant la revendication 1, caractérisée en ce qu'un rouleau guideur (7) pour la bande de matière fibreuse (1) et/ou une bande de support sous la forme d'un feutre ou d'une toile est disposé(e) le plus près possible de la fente de pressage (4).
  3. Presse suivant la revendication 2, caractérisée en ce qu'il est prévu une bande de support (8), sur laquelle la bande de matière fibreuse (1) est conduite du rouleau guideur (7) jusqu'à une unité qui suit, en particulier une unité de séchage.
  4. Presse suivant l'une quelconque des revendications précédentes, caractérisée en ce qu'une toile de séparation (9) ayant de préférence un faible pouvoir de rétention d'eau est conduite à travers la fente de pressage (4) sur au moins un côté de la bande de matière fibreuse (1) entre la bande presse-pâte (6) et la bande de matière fibreuse (1) et en ce que la bande de matière fibreuse (1) est conduite sur une zone prédéterminable sur la toile de séparation (9) après avoir quitté la fente de pressage (4).
  5. Presse suivant la revendication 4, caractérisée en ce que la bande de matière fibreuse (1) est conduite sur la toile de séparation (9) jusqu'à l'unité qui suit et est de préférence disposée en dessous de la bande de matière fibreuse (1).
  6. Presse suivant l'une quelconque des revendications précédentes, caractérisée en ce qu'un des éléments de pressage (2) présente, pour la formation d'une fente de pressage d'extension longitudinale prédéterminée avec l'autre élément de pressage (3), une face de pressage large, en particulier de forme concave, et possède une enveloppe de cylindre (10) constituée d'un matériau flexible, qui se déplace autour d'un support et est appuyée sur celui-ci par au moins un élément d'appui (11), et en ce que l'autre élément de pressage (3) possède une face de pressage de forme complémentaire à la face de pressage large et est de préférence formé d'un rouleau cylindrique rotatif.
  7. Presse suivant l'une quelconque des revendications précédentes, caractérisée en ce qu'un racloir (15) est associé à au moins un côté de la bande de matière fibreuse (1), afin de détacher la bande de matière fibreuse (1) d'un élément de pressage (2, 3) ou d'une bande presse-pâte (5, 6), sur lequel/laquelle elle est appliquée, après qu'elle ait quitté la fente de pressage.
  8. Presse suivant la revendication 7, caractérisée en ce que le racloir (15) est appliqué sur un élément de pressage (2) avec une face de pressage large, en particulier concave, l'élément de pressage (2) présentant une enveloppe de cylindre flexible (10), qui est appuyée sur un support par au moins un élément d'appui (11), et en ce que le racloir (15) opère entre l'élément d'appui (11) et un palier lisse (16) appuyant en plus l'enveloppe de cylindre (10) sur un support.
  9. Presse suivant la revendication 7, caractérisée en ce que, pour contribuer à la séparation de la bande de matière fibreuse (1) d'un autre élément (2, 3, 5, 6) opérée par le racloir (15), de l'air est insufflé dans la fente de pressage (4) dans le sens opposé au sens de défilement de la bande, le racloir (15) servant lui-même de distributeur d'air et de gicleur d'air ou de support pour un gicleur d'air correspondant.
  10. Presse suivant l'une quelconque des revendications 4 à 7, caractérisée en ce que la force de tension de la toile de séparation (9) à la sortie de la fente de pressage est réglable dans le sens de défilement de la bande, afin d'améliorer l'adhérence de la bande de matière fibreuse (1) sur la toile de séparation (9).
  11. Presse suivant l'une quelconque des revendications 1 à 7, caractérisée en ce que la bande de matière fibreuse (1) est conduite à travers la fente de pressage (4) entre deux bandes presse-pâte (5, 6) et en ce que l'élasticité d'épaisseur et/ou le pouvoir absorbant de la bande presse-pâte (5, 6), sur le côté de la bande de matière fibreuse (1), sur lequel la bande de matière fibreuse (1) doit être entraínée par la bande presse-pâte (5, 6) ou par la toile de séparation (9), est supérieur(e) au pouvoir absorbant de la bande presse-pâte (5, 6) sur le côté opposé de la bande de matière fibreuse (1).
  12. Presse suivant l'une quelconque des revendications 1 à 11, caractérisée en ce qu'un recouvrement d'un élément de pressage (2, 3) venant directement en contact avec la bande de matière fibreuse (1) se compose d'une matière repoussant la bande de matière fibreuse (1), en particulier de caoutchouc répulsif (Peeler-Rubber).
  13. Presse suivant l'une quelconque des revendications 1 à 12, caractérisée en ce que la bande presse-pâte (5, 6) et/ou la toile de séparation (9) est conduite à travers au moins un dispositif de pressage supplémentaire préalable (17, 19) avant de traverser la fente de pressage (4), de préférence au moins un des éléments de pressage dudit dispositif de pressage supplémentaire étant un rouleau aspirant.
EP96106575A 1996-04-25 1996-04-25 Presse humide Expired - Lifetime EP0803604B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP96106575A EP0803604B1 (fr) 1996-04-25 1996-04-25 Presse humide
DE59606766T DE59606766D1 (de) 1996-04-25 1996-04-25 Nasspresse
AT96106575T ATE200527T1 (de) 1996-04-25 1996-04-25 Nasspresse
US08/650,126 US5772849A (en) 1996-04-25 1996-05-17 Press

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP96106575A EP0803604B1 (fr) 1996-04-25 1996-04-25 Presse humide
US08/650,126 US5772849A (en) 1996-04-25 1996-05-17 Press

Publications (2)

Publication Number Publication Date
EP0803604A1 EP0803604A1 (fr) 1997-10-29
EP0803604B1 true EP0803604B1 (fr) 2001-04-11

Family

ID=26141887

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96106575A Expired - Lifetime EP0803604B1 (fr) 1996-04-25 1996-04-25 Presse humide

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US (1) US5772849A (fr)
EP (1) EP0803604B1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19840023A1 (de) * 1998-09-02 2000-03-09 Voith Sulzer Papiertech Patent Pressenanordnung
DE19839916A1 (de) * 1998-09-02 2000-03-09 Jagenberg Papiertech Gmbh Verfahren und Vorrichtung zur Verminderung des Volumens oder Drucks eines Fluids, das von sich bewegenden Oberflächen in einen Spalt eingeschleppt wird
DE19845954A1 (de) * 1998-10-06 2000-04-13 Voith Sulzer Papiertech Patent Entwässerungsvorrichtung
DE10022087A1 (de) * 2000-05-08 2001-11-22 Voith Paper Patent Gmbh Pressenpartie für eine Papiermaschine
DE10109382A1 (de) * 2001-02-27 2002-09-05 Voith Paper Patent Gmbh Pressanordnung
US20040023007A1 (en) * 2002-04-25 2004-02-05 Weder Donald E. Wrapper with decorative extension and method

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3215592A (en) * 1963-04-25 1965-11-02 Beloit Corp Paper press arrangement with automatic control of press felt moisture content
US3293121A (en) * 1963-10-09 1966-12-20 Black Clawson Co Pneumatically pressurized paper wet press assembly
US3325351A (en) * 1964-06-19 1967-06-13 Jean Pierre Maupas Water-extracting device in felt and press section for paper machines
US3556940A (en) * 1968-04-08 1971-01-19 Beloit Corp Press assembly
US3840429A (en) * 1972-08-07 1974-10-08 Beloit Corp Anti-rewet membrane for an extended press nip system
FI770542A7 (fi) * 1977-02-18 1978-08-19 Valkama P J Pressparti foer avlaegsning av vatten ur fiberbana
FI822425A7 (fi) * 1982-07-07 1984-01-08 Valmet Oy Menetelmä ja laite kuiturainan, etenkin paperi- tai kartonkirainan puristuskäsittelyssä.
FI82500C (fi) * 1985-02-18 1991-03-11 Valmet Oy Pressparti med separata pressnyp i en pappersmaskin.
DE3708191A1 (de) * 1987-03-13 1988-09-22 Voith Gmbh J M Nasspresse
DE3742848C3 (de) * 1987-12-17 1996-06-13 Escher Wyss Gmbh Pressenpartie einer Papiermaschine
US5232555A (en) * 1988-09-29 1993-08-03 Pulp And Paper Research Institute Of Canada Wet cellulosic web transfer method using air doctor blade
FI892705A7 (fi) * 1989-06-02 1990-12-03 Ahlstroem Valmet Pressparti foer en pappers-, kartong- eller cellulosatorkningsmaskin.
DE4112355A1 (de) * 1991-04-16 1992-10-22 Escher Wyss Gmbh Pressenpartie einer papiermaschine
DE4443875C2 (de) * 1994-12-09 2000-05-18 Voith Sulzer Papiermasch Gmbh Langspaltpresse

Also Published As

Publication number Publication date
US5772849A (en) 1998-06-30
EP0803604A1 (fr) 1997-10-29

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