EP0803604A1 - Presse humide - Google Patents

Presse humide Download PDF

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Publication number
EP0803604A1
EP0803604A1 EP96106575A EP96106575A EP0803604A1 EP 0803604 A1 EP0803604 A1 EP 0803604A1 EP 96106575 A EP96106575 A EP 96106575A EP 96106575 A EP96106575 A EP 96106575A EP 0803604 A1 EP0803604 A1 EP 0803604A1
Authority
EP
European Patent Office
Prior art keywords
press
fibrous web
press nip
pressing
nip
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.)
Granted
Application number
EP96106575A
Other languages
German (de)
English (en)
Other versions
EP0803604B1 (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 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 Voith Sulzer Papiermaschinen GmbH filed Critical Voith Sulzer Papiermaschinen GmbH
Priority to AT96106575T priority Critical patent/ATE200527T1/de
Priority to DE59606766T priority patent/DE59606766D1/de
Priority to EP96106575A priority patent/EP0803604B1/fr
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 press elements, the pressing surfaces of which can be pressed against one another to form a press nip, the fibrous web being guided through the press nip together with at least one drainage belt running between the fibrous web and one of the press elements.
  • Such a press is known from DE-OS 41 12 355.
  • the fibrous web to be dewatered is guided between two dewatering belts through the press nip, the fibrous web remaining in contact with at least one dewatering belt in at least one section following the press nip.
  • this has the advantage that the fibrous web is guided in this section by the drainage belt in question, which can be advantageous in particular at high speeds in order to avoid web breaks or web flutter, this can result in rewetting of the fibrous web starting from the drainage belt.
  • the object of the invention is to provide a press of the type mentioned, which is suitable for high web speeds and in which rewetting of the fibrous web at the press nip outlet is prevented or at least greatly reduced.
  • each dewatering belt at the press nip outlet is separated from the fibrous web and on at least one side of the fibrous web in a section following the press nip over a predeterminable angular range on the respective associated press element is guided so that rewetting of the fibrous web by the dewatering belt after leaving the press nip is at least partially prevented and a guide roller following the press nip for the fibrous web can be arranged as close as possible to the press nip.
  • the guide roller for the fibrous web and / or a support belt in the form of a felt or sieve which belongs to a subsequent unit, can be arranged as close as possible to the press nip, as a result of which the free pull, that is to say the section of the fibrous web supported by no belt, up to Guide roller is reduced, so that due to the greatest possible guidance of the fibrous web, the risk of web breaks and web flutter is reduced even at high speeds or the tension in the fibrous web can be kept lower.
  • guide rollers for the dewatering belts of the press can be omitted in the area after the press nip, which not only saves space, but also a suction effect with regard to the liquid to be removed from the fibrous web in the direction of the dewatering belts rapidly running away from it.
  • the degree of dewatering can be increased, so that, for example, in papermaking, only one such dewatering press can be used within the paper machine.
  • a separating screen with preferably low liquid storage capacity through the Press nip is guided and the fibrous web is guided over a predeterminable distance on the separating screen after leaving the press nip. This reduces the risk of web breaks and web flutter even at high speeds.
  • the separating screen can be designed with few markings since it is pressed against the fibrous web in the press nip. However, there are also applications in which the separating screen is aimed at embossing a fibrous web side, for example in paper for packaging or sleeves. The separating screen can then have corresponding markings.
  • one of the pressing elements to form a press nip predetermined longitudinal extent with the other pressing element has a wide, in particular concave shaped, pressing surface and has a roller jacket consisting of a flexible material which moves around a carrier and over at least one Support element is supported on this, and the other pressing element has a pressing surface complementary to the wide pressing surface and is preferably formed by a rotating cylindrical roller.
  • the thickness elasticity and / or the absorbency of the dewatering belt on the side of the fibrous web on which the fibrous web is to be carried along by the dewatering belt or the separating screen is expediently greater than the thickness elasticity and / or the absorbency of the drainage belt on the opposite side of the fibrous web.
  • this is preferably provided below the fibrous web, so that the separating sieve can ensure good guidance of the fibrous web to the subsequent unit.
  • the press consists of two superimposed pressing elements 2 and 3, the pressing surfaces of which are pressed against one another, wherein at least one dewatering belt 5 or 6 arranged between the fibrous web 1 and one of the pressing elements 2 and 3 runs through the press nip 4 .
  • the lower pressing element 3 is formed by a rotating cylindrical roller, which can be conventional or controlled by deflection.
  • the upper pressing element 2 can form a concave pressing surface, a roller jacket 10 consisting of flexible material moving around a support (not shown) and supported on this support via at least one support element 11.
  • both pressing elements 2, 3 can have a wide pressing surface and each have a flexible jacket.
  • the fibrous web 1 is removed from a preceding wire section via a suction roller 17 and is delivered to the drying cylinders 18 of a subsequent dryer section.
  • the exemplary embodiments have in common that the drainage belts 5 and 6, as soon as possible after leaving the press nip 4, move away from the fibrous web 1 and, in a section 12, run along the corresponding press element 2 or 3.
  • the drainage belts 5, 6 are otherwise, as can be seen in FIGS. 1 to 5, guided over felt guide rollers 13 and can be used in front of the press nip 4 to guide the fibrous web 1.
  • the use of two drainage belts 5 and 6 alone can significantly increase the drainage capacity of the extended nip press.
  • the convex curvature of the upper pressing element 2 at the outlet of the concave pressing surface allows the dewatering belt 5 to move immediately from the fibrous web 1 to the press nip 4 at least in a section 12 along the pressing element 2, which results in rewetting of the fibrous web 1 from this dewatering belt 5 prevented.
  • the fibrous web 1 runs in the manner shown in FIGS and 2 shown presses after the press nip 4 approximately tangential to the lower press element 3 in a, although very short, suction zone 14 on the underside of the fibrous web together with the lower dewatering belt 6 along the cylindrical press element 3.
  • suction zone 14 there is relaxation of the lower drainage belt 6, which is more elastic than the upper drainage belt 5 and thus for the suction of liquid from the fibrous web 1 into the lower drainage belt 6.
  • the lower drainage belt 6 is also separated from the fibrous web 1 because of the impending rewetting.
  • the dewatering belt 6, as shown in FIGS. 2, 3 and 4, runs along the pressing element 3 in a section 12 which extends beyond the suction zone 14.
  • the space gained by guiding the drainage belts 5 and 6 along the pressing element 2 and 3 is used to arrange a guide roller 7 following the press nip 4 as close as possible to the press nip 4. This shortens the free length of the fibrous web 1 between the press nip 4 and the guide roller 7 and thus counteracts the fluttering and tearing of the fibrous web 1.
  • a support belt 8 for guiding the fibrous web 1 to a drying cylinder 18 of a subsequent drying unit runs over the guide roller 7.
  • the support belt 8 is usually designed as a sieve and can also be arranged on the other side of the fibrous web 1.
  • the press 2, 3 can be preceded by at least one further press device 17, 18 with a press nip 4 '.
  • the dewatering belts 5, 6, together with the fibrous web 1 in between advantageously also pass through the press nip 4 'of this upstream press device, as a result of which the transport of the fibrous web 1 between the upstream press device 17, 18 and the press 2, 3 simply designed.
  • At least one of the pressing elements 17, 18 of the further pressing device is preferably a suction roll.
  • FIGS. 3 to 6 show long-nip presses in which a separating screen 9 runs between the dewatering belt 6 of the lower pressing element 3 and the fibrous web 1, which separator is in contact here with the fibrous web 1 at least in a section before and after the press nip 4 and thereby the fibrous web 1 leads.
  • This guidance of the fibrous web 1 can take place, for example, up to the subsequent unit.
  • two separating screens 9 enclosing the fibrous web 1 are passed through the press nip 4. Since the separating screen 9 is guided together with the fibrous web 1 through the press nip 4, it should be low-marking or strongly marking depending on the requirements of the end product and in any case have a very low liquid storage capacity due to the risk of rewetting after leaving the press nip 4.
  • the tensioning force of the separating screen 9 at the press nip outlet can preferably be adjustable in the direction of web travel.
  • the suction zone 14 can be made variable in all versions with regard to its extension in the web running direction, so that rewetting of the dewatering belt 6 is excluded becomes. This is made possible by changing the course of the fibrous web 1 after the press nip 4 by changing the position of the corresponding guide roller and by means of the adjustable longitudinal tension in the separating screen 9.
  • the fibrous web 1 remains in contact with the drainage belt 6 of the cylindrical press element 3 in the suction zone 14, the drainage in the press nip 4 should predominantly take place to the other press element 2, which is achieved, for example, by the concave Pressing element 2 has a grooved or blind drilled hole and the cylindrical pressing element 3 has a smooth surface.
  • a scraper 15 on the pressing element 2, 3 or the drainage belt 5, 6, to which the fibrous web should not adhere. If it is a pressing element 2, 3 with a wide pressing surface 4, the scraper 15 should be arranged in an area of the flexible roll shell 10 in which it is not supported by a slide bearing 16. This enables gentle scraping, since the scraper 15 presses the roller jacket 10 at least slightly against the excess air pressure prevailing in the roller jacket and can therefore be particularly effective.
  • the press 2, 3 can be preceded by a further pressing device 17, 18 through which the fibrous web 1 passes.
  • the separating screen 9 also passes through the press nip 4 'of this upstream press device 17, 18 in order to easily transport the fibrous web 1 from the press device 17, 18 to the press 2, 3.
  • the upper dewatering belt 5, as shown in FIG. 4 is also passed through the press nip 4 'of the upstream press device.
  • FIGS. 7 and 8 show the press shown in FIG. 5 with the proviso that a drainage belt 6 is provided only on the underside of the separating screen 9 and the fibrous web 1 rests directly on the pressing element 2 on its upper side.
  • the cover of the pressing element 2 that comes into direct contact with the fibrous web 1 consists of a material that repels the fibrous web, in particular of peeler rubber, in order to ensure easy separation of the fibrous web 1 from the press roll 2 when it leaves the press nip 4.

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  • Paper (AREA)
EP96106575A 1996-04-25 1996-04-25 Presse humide Expired - Lifetime EP0803604B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT96106575T ATE200527T1 (de) 1996-04-25 1996-04-25 Nasspresse
DE59606766T DE59606766D1 (de) 1996-04-25 1996-04-25 Nasspresse
EP96106575A EP0803604B1 (fr) 1996-04-25 1996-04-25 Presse humide
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 true EP0803604A1 (fr) 1997-10-29
EP0803604B1 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

Country Status (2)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0985764A2 (fr) * 1998-09-02 2000-03-15 Voith Sulzer Papiertechnik Patent GmbH Dispositif de pressage
DE19845954A1 (de) * 1998-10-06 2000-04-13 Voith Sulzer Papiertech Patent Entwässerungsvorrichtung

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3293121A (en) * 1963-10-09 1966-12-20 Black Clawson Co Pneumatically pressurized paper wet press assembly
FR2195723A1 (fr) * 1972-08-07 1974-03-08 Beloit Corp
FR2381127A1 (fr) * 1977-02-18 1978-09-15 Valkama Paavo Section de pressage pour enlever l'eau d'une bande de fibres
FR2529922A1 (fr) * 1982-07-07 1984-01-13 Valmet Oy Procede et equipement pour le traitement par compression d'une bande continue de fibres et en particulier une bande continue de papier ou de carton
DE3604522A1 (de) * 1985-02-18 1986-09-04 Valmet Oy, Helsinki Papiermaschinenpressenpartie mit separaten pressenspalten
DE3708191A1 (de) * 1987-03-13 1988-09-22 Voith Gmbh J M Nasspresse
DE4443875A1 (de) * 1994-12-09 1996-06-13 Voith Sulzer Papiermasch Gmbh Langspaltpresse

Family Cites Families (7)

* 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
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
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
FI892705A (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

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3293121A (en) * 1963-10-09 1966-12-20 Black Clawson Co Pneumatically pressurized paper wet press assembly
FR2195723A1 (fr) * 1972-08-07 1974-03-08 Beloit Corp
FR2381127A1 (fr) * 1977-02-18 1978-09-15 Valkama Paavo Section de pressage pour enlever l'eau d'une bande de fibres
FR2529922A1 (fr) * 1982-07-07 1984-01-13 Valmet Oy Procede et equipement pour le traitement par compression d'une bande continue de fibres et en particulier une bande continue de papier ou de carton
DE3604522A1 (de) * 1985-02-18 1986-09-04 Valmet Oy, Helsinki Papiermaschinenpressenpartie mit separaten pressenspalten
DE3708191A1 (de) * 1987-03-13 1988-09-22 Voith Gmbh J M Nasspresse
DE4443875A1 (de) * 1994-12-09 1996-06-13 Voith Sulzer Papiermasch Gmbh Langspaltpresse

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0985764A2 (fr) * 1998-09-02 2000-03-15 Voith Sulzer Papiertechnik Patent GmbH Dispositif de pressage
EP0985764A3 (fr) * 1998-09-02 2001-06-27 Voith Paper Patent GmbH Dispositif de pressage
DE19845954A1 (de) * 1998-10-06 2000-04-13 Voith Sulzer Papiertech Patent Entwässerungsvorrichtung

Also Published As

Publication number Publication date
EP0803604B1 (fr) 2001-04-11
US5772849A (en) 1998-06-30

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