EP1478806A1 - Dispositif de lissage - Google Patents

Dispositif de lissage

Info

Publication number
EP1478806A1
EP1478806A1 EP03708090A EP03708090A EP1478806A1 EP 1478806 A1 EP1478806 A1 EP 1478806A1 EP 03708090 A EP03708090 A EP 03708090A EP 03708090 A EP03708090 A EP 03708090A EP 1478806 A1 EP1478806 A1 EP 1478806A1
Authority
EP
European Patent Office
Prior art keywords
smoothing
fibrous web
suction
smoothing device
smooth
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
EP03708090A
Other languages
German (de)
English (en)
Other versions
EP1478806B1 (fr
Inventor
Karl Steiner
Andreas Meschenmoser
Joachim Henssler
Klaus Esslinger
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=27740289&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1478806(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1478806A1 publication Critical patent/EP1478806A1/fr
Application granted granted Critical
Publication of EP1478806B1 publication Critical patent/EP1478806B1/fr
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

Links

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 the smoothing device of a press arrangement for dewatering a paper, cardboard, tissue or other fibrous web in a machine for producing and / or finishing the same, the fibrous web together with a water-absorbing, rough and endlessly circulating belt and one on the opposite On the side of the fibrous web, the endless, smooth belt runs through at least one press nip and the rough band is guided away from the fibrous web after the press nip.
  • the object of the invention is therefore to reduce the two-sidedness of the fibrous web with the simplest possible means.
  • the object was achieved in that the smooth band forms a smoothing gap with a smoothing element with a smooth pressing surface after the rough band has been removed.
  • This smoothing gap increases the smoothness on both sides of the fibrous web while reducing the two-sidedness with minimal effort.
  • the smoothing element simultaneously guides the fibrous web after the smoothing gap, i.e. that the smooth band transfers the fibrous web to the smoothing element.
  • the surface of the smooth belt should be softer than that of the smoothing element.
  • the smoothing element and / or the smooth band are arranged such that they can be moved away from one another and a discharge gap can thereby be realized.
  • the fibrous web in the area of the press assemblies is still relatively moist, it is sufficient for smoothing if the smooth band and the smoothing element are pressed against one another with a contact pressure that is between 3 and 100 kN / m, preferably between 5 and 20 kN / m.
  • a contact pressure which is set or controlled depending on the degree of bilaterality of the fibrous web after the smoothing device, preferably at the end of the machine ,
  • the smoothing element can be designed as a smooth, continuously rotating smoothing belt or as a smooth, rotatable smoothing roller.
  • the smoothing roller it is advantageous for drying and for increasing the smoothness of the rough side of the fibrous web if the smoothing roller is heated and in particular is designed as a drying cylinder.
  • the smooth belts are preferably used at the end of the press section, which means that the press nip should preferably be the last press nip of the machine.
  • the transfer should preferably be supported by at least one suction device, in particular if the fibrous web is transferred from the smoothing element to a drying group for drying the fibrous web.
  • the fibrous web has a short length free train, ie runs unsupported from the smoothing element to a subsequent element.
  • the fibrous web is supported by a dryer fabric, alternately guided over heated drying cylinders and guide rollers, the drying cylinders being arranged under the fibrous web to improve the web guidance, to simplify the construction and to enable simple reject removal.
  • the fibrous web can be transferred from the smoothing element in a safe and simple manner to a dryer fabric of the following dryer group, in that the dryer fabric in the transfer area is guided past a suction device, preferably in the form of a suction box.
  • the fibrous web can simply be transferred from the smoothing element to a transfer suction roll, which then in turn transfers the fibrous web to the dryer fabric of the dryer group.
  • the fibrous web it is also possible for the fibrous web to be transferred from the smoothing element to an air-permeable transfer belt, which in the transfer area loops around a suction device, preferably in the form of a suction roller, and transfers the fibrous web to the dryer fabric of the following drying group.
  • a suction device for sucking the fibrous web is arranged downstream of the smoothing element in the running direction of the fibrous web.
  • the arrangement of the suction device is independent of the conveying mechanism to which the fibrous web is transferred.
  • the fibrous web can then be transferred, for example, to a transfer belt or directly to a dryer fabric.
  • What is achieved by the suction device is that the fibrous web separates from the previous smoothing element, in particular a smoothing roller, under a defined suction force. Web flutter and tears, as can occur in an open train without the help of a suction device, are avoided.
  • the suction device is preferably designed such that it comprises a suction box and / or a suction roller.
  • the suction roller is preferably equipped on its surface with a helical or spiral groove, in which holes are made at regular intervals for sucking in air and water.
  • the perforated roller jacket is connected to a vacuum source.
  • the suction box is preferably designed in such a way that it adjoins a non-wrapped area of the lateral surface of the suction roller.
  • the suction box has a first and a second element which can be pressed elastically against the fibrous web, between which at least one suction zone is designed for sucking the fibrous web.
  • a plurality of zones to be suctioned with different pressures are arranged one behind the other and / or next to one another in the area of the suction box. This measure allows the desired suction pressure to be set very precisely and in accordance with the web speed and other web parameters.
  • the fibrous web can be conveyed past the suction device via a drying cylinder and at least one further suction device.
  • the invention is also suitable for use when threading a strip of a fibrous web.
  • it is sufficient, for example, if the suction roll is vacuumed only in a section over which the leading strip is guided.
  • a suction box is also available, it does not necessarily have to be vacuumed. But also the suction box can be according to the width of the 03 01315
  • the strip can be extended over the entire width of the fibrous web, the suction roller and / or the suction box then also being vacuumed over the entire width of the fibrous web.
  • the dryer fabric is brought into contact with the smoothing roller.
  • the suction roller and, with it, the suction box are arranged so as to be pivotable.
  • the dryer fabric is driven at a somewhat higher speed than the belt of the press section. In this way it is achieved that the fibrous web detaches more easily from the smoothing element, in particular the smoothing roller. This can also positively influence the technological paper properties of the web in the direction of web travel. A speed difference between 0.5 and 5.0% is preferred.
  • the press arrangement ensures a low two-sidedness of the web with regard to the smoothness with a very high level of smoothness at the same time and a reliable web performance, which is based on the fact that the fibrous web has no or only a short free tension area, i. H. an area where it is not supported.
  • FIG. 1 a schematic side view of a press arrangement with a smoothing device
  • Figure 2 the press assembly with another smoothing device
  • Figure 3 is a schematic side view of another press arrangement with
  • the press nip is the last or even the only press nip of a press section of a paper machine for dewatering the fibrous web 1, 20, 53 and is generally formed by two press rolls 12, 31, 32 pressed against one another. In any case, only a relatively small amount of water will be pressed out of the fibrous web 1, 20, 53 in the press nip, so that only one press felt is sufficient to absorb the squeezed water.
  • the smooth belt 3, 25 can thus improve the guidance of the fibrous web 1, 20, 53, in particular at high machine speeds. Both belts 2, 3, 24, 25 are guided outside the press nip over guide rollers 9, 26.
  • the fibrous web 1, 20, 53 is guided from the press section to a drying group of the paper machine. There, the fibrous web 1, 20, 53 is supported by a drying wire 5, 38, alternately guided over heated drying cylinders 10, 41, 51 and suctioned guide rollers 11, 42. The drying cylinders 10, 41, 51 are arranged below and the guide rolls 11, 42 above the fibrous web 1, 20, 53.
  • the meandering course of the fibrous web 1, 20, 53 results in a simple and space-saving structure of the drying group. In addition, such dryer groups are well suited for high machine speeds and quick and safe waste removal.
  • the fibrous web 1, 20, 53 is smoothed on one side by contact with the smooth band 3, 25, while the other side remains rough or even becomes rough through contact with the relatively rough press felt. Although this two-sidedness can be reduced in the smoothing units arranged at the end of the machine, it can rarely be completely corrected.
  • the fibrous web 1, 20, 53 is still relatively moist, so that the two-sided speed can be influenced with relatively simple means and low pressing forces.
  • the press felt is guided away from the fibrous web 1, 20, 53 after the press nip.
  • the fibrous web 1, 20, 53 can then run through a smoothing device in which the two-sidedness of the fibrous web 1, 20, 53 is counteracted by smoothing.
  • the fibrous web 1, 20, 53 is then transferred to the dryer fabric 5, 38 of the following dryer group.
  • the smoothing device is formed here by a smoothing roller 4, 34, 50, which is pressed against the smooth belt 3, 25 with the fibrous web 1, 20, 53.
  • the smooth belt 3, 25 is supported on the opposite side by a press roller 13, 35.
  • the smoothing roller 4, 34, 50 can be changed in its position in such a way that the smoothing gap can also be opened for rejecting waste. It is of course also possible to arrange the press roller 13, 35 so that it can move.
  • the smoothing roller 4, 34, 50 can also be replaced by a smoothing belt which is pressed towards the smooth belt 3, 25 via a roller or which also wraps around the press roller 13, 35 with the smooth belt 3, 25.
  • the smooth belt 3 runs under the fibrous web 1, which offers advantages in the web guidance.
  • Transfer transfer belt 14 which in turn passes the fibrous web 1 to the dryer fabric 5.
  • the transfer belt 14 wraps around the two
  • Transfer points each have a roller 8, the roller assigned to the smoothing roller 4 for Support of the transfer as a suction roller 7 is executed.
  • the fibrous web 1 is transferred to a transfer suction roll 7 and from there to the dryer fabric 5.
  • the smooth band 3 is arranged above the fibrous web 1 in the press arrangement shown in FIG. This simplifies the transfer of the fibrous web 1 after smoothing, since the fibrous web 1 from the smoothing roll 4 directly, i.e. can be passed to the dryer fabric 5 without turning.
  • the drying wire 5 runs along a suction box 6 in the area of the takeover. The vacuum coming from the suction box 6 pulls the fibrous web 1 to the dryer fabric 5.
  • a fibrous web 20 (FIG. 4) is transported via conveyor belts 21-25 in the direction of an arrow A, each of which runs over guide rollers 26.
  • conveyor belts 21-25 At the transfer points between the conveyor belts 21-25 there are suction rolls with fixed suction boxes and a roll shell rotating around them, like the suction rolls 27, 28 with suction boxes 29 and 30 respectively.
  • the fibrous web 20 is guided to a pair of rolls with smoothing rolls 34, 35.
  • the smoothing roller 34 is additionally equipped with scrapers 36, 37 for removing impurities.
  • the fibrous web 20 is transferred from the conveyor belt 25 to a dryer fabric 38.
  • a suction roller 39 is used for this purpose in connection with a suction box 40, which is shown above the suction roller 39 and in one embodiment has an approximately trapezoidal cross section. Due to the arrangement of the suction box 40 and the suction roller 39, the fibrous web 20 is transferred directly from the support on the smoothing roller 34 to a suction area on the side facing the smoothing roller 34 without a free draft.
  • the dryer fabric 38 rotates with one Speed of 0.5 to 5.0% faster than conveyor belts 21 to 25.
  • the fibrous web 20 is then passed over a drying cylinder 41 and from there onto a further combination of a suction roller 42 and a suction box 43.
  • FIG 5 shows a suction box 52 arranged between a smoothing roll 50 and a drying cylinder 51 or between two drying cylinders 50, 51 for sucking in a fibrous web 53 (shown here only on one side for simplicity) from the smoothing roll 50 and for transferring it to the drying cylinder 51, the fibrous web 20 is guided below the suction box 52 around a suction roller 54.
  • the suction box 52 is equipped with a suction region 57, which is delimited by resilient elements 55, 56 and has a passage 58 for removing sucked-in air and moisture.
  • the elements 55, 56 can be actuated via adjusting shafts 59, 60 in order to change their contact pressure against the fibrous web 53.
  • Additional suction areas can be connected to the suction area 57, which, like the suction area 57, are delimited by elastic elements, wherein the suction force can be changed individually in each of the suction areas in order to achieve an optimal transfer of the fibrous web 53 to the drying cylinder 51.

Landscapes

  • Paper (AREA)
  • Air Bags (AREA)
  • Surgical Instruments (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

La présente invention concerne un dispositif de lissage d'un système de presse conçu pour déshydrater une bande de papier, carton, tissu ou d'une autre matière fibreuse (1, 20, 53) dans une machine pour produire et/ou façonner celle-ci. La bande de matière fibreuse (1, 20, 53) passe à travers au moins un interstice de presse conjointement avec une bande rugueuse continue (2, 24) qui absorbe l'eau et une bande lisse continue (3, 25) qui est placée sur la face opposée de la bande de matière fibreuse (1, 20, 53), la bande rugueuse (2, 24) étant écartée de la bande de matière fibreuse (1, 20, 53) après l'interstice de presse. Afin de réduire l'envers de manière simple, la bande lisse (3, 25) forme, avec un élément lissant présentant une surface de presse lisse, un interstice de lissage, après écartement de la bande rugueuse (2, 24).
EP03708090A 2002-02-22 2003-02-11 Dispositif de lissage Revoked EP1478806B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10207375 2002-02-22
DE10207375 2002-02-22
PCT/EP2003/001315 WO2003071028A1 (fr) 2002-02-22 2003-02-11 Dispositif de lissage

Publications (2)

Publication Number Publication Date
EP1478806A1 true EP1478806A1 (fr) 2004-11-24
EP1478806B1 EP1478806B1 (fr) 2007-04-11

Family

ID=27740289

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03708090A Revoked EP1478806B1 (fr) 2002-02-22 2003-02-11 Dispositif de lissage

Country Status (6)

Country Link
US (1) US20050016703A1 (fr)
EP (1) EP1478806B1 (fr)
AT (1) ATE359393T1 (fr)
AU (1) AU2003212238A1 (fr)
DE (2) DE10305754A1 (fr)
WO (1) WO2003071028A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004050593A1 (de) * 2004-10-16 2006-04-20 Voith Paper Patent Gmbh Pressanordnung
DE102005009858A1 (de) * 2005-03-04 2006-09-07 Voith Paper Patent Gmbh Papiermaschine
DE102005031203A1 (de) * 2005-07-01 2007-01-25 Voith Patent Gmbh Papiermaschine
AT504090B1 (de) * 2006-09-13 2008-09-15 Andberg Janne Johannes Wechselseitige glättanordnung einer entwässerungsvorrichtung mit einer gewebeüberzogenen überführsaugwalze
EP1988451A1 (fr) * 2007-05-04 2008-11-05 Deutsche Thomson OHG Procédé de génération d'un ensemble d'instructions interprétables par la machine pour présenter le contenu de média à un utilisateur
AT521368B1 (de) * 2019-04-18 2020-01-15 Andritz Ag Maschf Vorrichtung und verfahren zum überführen eines streifens einer bahn

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI82274C (fi) * 1989-03-30 1991-02-11 Valmet Paper Machinery Inc Foerfarande foer varmpressning och torkningsanordning.
US6030499A (en) * 1993-06-11 2000-02-29 Valmet Corporation Method and apparatus in a paper or board machine for dewatering the web
DE4440948A1 (de) * 1994-11-17 1996-05-23 Voith Gmbh J M Verfahren zum Aufführen einer Papierbahn in eine Papiermaschine, Naßpartie einer Papiermaschine sowie Saugwalze für eine Papiermaschine
EP0870866B1 (fr) * 1996-12-23 2003-05-07 Voith Paper Patent GmbH Appareil et procédé pour la déshumidification d'une bande

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03071028A1 *

Also Published As

Publication number Publication date
DE50307015D1 (de) 2007-05-24
US20050016703A1 (en) 2005-01-27
AU2003212238A1 (en) 2003-09-09
ATE359393T1 (de) 2007-05-15
DE10305754A1 (de) 2003-09-18
EP1478806B1 (fr) 2007-04-11
WO2003071028A1 (fr) 2003-08-28

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