EP2085515A2 - Dispositif de drainage de bandes de papier mouchoir - Google Patents

Dispositif de drainage de bandes de papier mouchoir Download PDF

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Publication number
EP2085515A2
EP2085515A2 EP08171455A EP08171455A EP2085515A2 EP 2085515 A2 EP2085515 A2 EP 2085515A2 EP 08171455 A EP08171455 A EP 08171455A EP 08171455 A EP08171455 A EP 08171455A EP 2085515 A2 EP2085515 A2 EP 2085515A2
Authority
EP
European Patent Office
Prior art keywords
suction
permeable
roll
belt
dewatering
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.)
Withdrawn
Application number
EP08171455A
Other languages
German (de)
English (en)
Other versions
EP2085515A3 (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 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 Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2085515A2 publication Critical patent/EP2085515A2/fr
Publication of EP2085515A3 publication Critical patent/EP2085515A3/fr
Withdrawn legal-status Critical Current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
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/006—Making patterned paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • D21F11/145—Making cellulose wadding, filter or blotting paper including a through-drying process
    • 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
    • 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

Definitions

  • the invention relates to a device for the production of tissue webs, comprising a device for dewatering with an endless, permeable structured tape and, a suction roll partially circumferentially endless permeable Enticass mecanicsband, wherein the permeable structured band over a portion of its circulation path together with the permeable drainage tape is guided over at least a portion of the Umschlingungs Schles the permeable drainage tape with the suction roll to form a dewatering section and means for applying a pressure on the two bands and the tissue web guided between them in this dewatering section.
  • TAD through-air drying process
  • a device for dewatering a fibrous web which comprises a permeable structured strip which guides the fibrous web over a suction roll, a permeable dewatering belt which contacts the fibrous web and also passes over the suction roll and a mechanism for applying a pressure to the web permeable structured band, the fibrous web and the permeable dewatering band.
  • the permeable structured band is preferably used simultaneously as the fibrous suspension receiving band by this is an endlessly circulating belt part of a former, which adjoins a headbox.
  • the pulp suspension is introduced into a gap which is formed by the continuous circulating permeable and structured band and another endless circulating band in the form of a forming screen, wherein the permeable structured band wraps around a forming roller and the pulp suspension at least in the wrapping region of the permeable structured band with the forming roller is guided between the permeable structured band and the forming fabric.
  • a very strong retention takes place, wherein following the forming roller, the two bands are separated from each other and the fibrous web is guided with the structured permeable belt to a mechanical screen press.
  • the mechanism for applying a Pressure on the permeable structured band, the fibrous web and the permeable dewatering band in the region of the suction roll comprises an endlessly circulating, in particular permeable, band which presses against the inside of the permeable structured band in the area of the suction roll.
  • the contact pressure is set by the belt tension, whereby the maximum achievable pressure is relatively small.
  • a correspondingly high tension of the press belt is required, which in turn leads to an increase in the cost of the belts.
  • additional pressing means acting on the press belt can be provided, which locally increase the contact pressure in the effective region of the press belt.
  • a very large suction roller over the press nip area is required.
  • the pressure generating band Due to the size of a large negative pressure and large amounts of hot air are required because of the triple covering a very high heat loss occurs.
  • the pressure generating band is exposed to very high temperatures, which must be considered in the design of the band. The high temperatures also lead to a reduction in the lifetime. Since the pressure generating band is within the loop of the endlessly circulating permeable structured band, the risk of a band break is very high. The investment and operating costs are very high, the same applies to the required exchange or change of the pressure applying band.
  • the invention is therefore based on the object, a device for dewatering fibrous webs, in particular tissue webs of the type mentioned by a mechanical pressing device further develop such that the disadvantages mentioned are avoided.
  • the operating and investment costs are to be reduced and it should also be the known operations in the tissue production as previously possible with little effort.
  • the device according to the invention for producing a tissue web comprises a structured permeable tape and a permeable dewatering belt at least partially wound around a suction roll, wherein the suction roll is disposed within the permeable dewatering belt and the permeable structured belt in the belt area forming a dewatering section over a portion of the circulation path together with the permeable band is guided on the suction roll.
  • means for applying a contact pressure in this dewatering section include according to the invention a device for applying a localized in the direction of passage pressure, in particular in the form of a pressure roller, which is arranged in the direction of passage of the tissue web in the inlet region in the dewatering section on the suction roll to form a press nip.
  • the agents are free from a pressing pressure applying press belt.
  • the proportion of the mechanically generated dewatering in the inlet is thus increased in the dewatering section formed by the suction roll with the strips.
  • the press nip is positioned such that it is preferably at the beginning of the suction zone. Due to the mechanical drainage routed at the beginning of the suction zone and the resulting moisture reduction on the tissue web, a subsequent drying of the drip following mechanical dehydration can become more effective. An additional heating of the bands is eliminated and the open flow area is increased here, since the entire wrap around the press nip downstream of the suction roll can be used to flow through.
  • a flow-through drying device is arranged downstream of the press nip.
  • This preferably comprises at least one hot-air blowing device which becomes effective on the inner periphery of the permeable structured band in the wrapping area on the suction roll.
  • the wrap area is identical at least to the theoretically possible suction zone or the suction zone is effective in the entire wrap area.
  • the mechanical load on the suction roll can be reduced. This is only embraced by the permeable drainage tape and it is also applied only over a short area in the wrap a contact pressure.
  • the suction roll can thereby be made considerably smaller in terms of their dimensions. This leads to a saving of space, further it is possible to design the suction roll of the same design and dimensions as other suction rolls in the system, so that here only a single roll type must be kept in reserve, which is used in different areas in the device can get.
  • a roller is selected which produces a soft press nip, that is to say a press nip, which is not only characterized by a line force but is slightly widened in the direction of passage.
  • this may be a conventional roller with a rigid shell, which is covered on the outer circumference with a correspondingly soft cover, which behaves elastically when acted upon or when the press nip is formed.
  • a roll with deflection compensation it is conceivable to use a roll with deflection compensation.
  • a central support member is provided which is fixedly mounted and is guided rotatably about a jacket.
  • the jacket is preferably highly elastic.
  • the pressure roller can also be designed as a shoe press roll. This is characterized by a flexible endless revolving roll shell, on the inner circumference of a stationary shoe can be pressed.
  • the design of the pressing element according to one of the possibilities offers the advantage that it can be used here on standardized pressure rollers.
  • the slightly extended press nip leads overall to lower forces due to the increased contact surface.
  • the contact pressure by the pressure roller is controlled depending on the type of construction in a simple manner.
  • the controllability can be carried out both across the width transverse to the tissue web running direction, wherein the control preferably takes place at least zone-wise, very particularly preferably steplessly over the entire width. This makes it possible to influence the moisture cross profile over the tissue web width.
  • the solution according to the invention is characterized by the more intensive mechanical dehydration at the beginning of the dewatering zone by a reduction of the energy input.
  • the water content in the web before beginning the throughflow drying is reduced.
  • the throughflow drying device in the region of the suction zone of the suction roll of the device for applying a contact pressure, it is also possible to associate these upstream of the drying device and the device downstream suction roll. As a result, the tissue web no longer cools down on the way to the drying device, whereby an energy saving due to the no longer required high dry power input into the tissue web is achieved.
  • the device is laid for dewatering in the area of the drying device, resulting in a particularly compact design in the machine direction.
  • the distance between the bearing axis of the suction roller wrapped by the permeable drainage belt and the drying device, in particular the drying cylinder or a through-flow drying cylinder in the machine direction, is ⁇ 5 m, preferably between 2 and 3 inclusive.
  • a suction device is arranged downstream.
  • the guide rollers are arranged such that readily the pressing device can be removed from the web pass and a simple conversion and pivoting to form a normal Crescentformers is possible.
  • FIG. 1a illustrates in a simplified schematic representation of the basic structure of an inventively designed device 101 for dewatering fibrous webs, especially tissue webs T in a machine 100 for producing such a fibrous web, in particular tissue web T.
  • the machine 100 comprises a headbox 1, which is a forming unit 15 upstream.
  • the forming unit 15 comprises two endlessly circulating belts, in particular sieve belts.
  • a first screen belt is designated 2 and acts as a forming screen.
  • the second band is designed as a permeable structured band 4. This is guided by guide rollers 12.
  • Both bands are guided over a portion of their circulation path via a forming roller 3 together to form an inlet gap 14 for the introduced over the headbox 1 pulp suspension S and form in Umschlingungs Scheme 16 with the forming roller 3 a first dewatering section in which the pulp suspension S due to the voltage between the two bands 2, 4 is dewatered around the forming roller 3 at this.
  • the forming roller 3 can be carried out for this purpose preferably also sucked.
  • the screen belts 2 and 4 are separated from each other after the belt 16, wherein the resulting from the pulp suspension S fibrous web, in particular tissue web T, with the permeable structured band 4 on the device 101 to a drying device 18, in particular a heated drying cylinder 8 in Shape of a so-called Yankee cylinder or through-flow drying to be led.
  • the device 101 comprises a device 36 for applying a locally localized pressure in the passage direction, in particular a press device 17, through which the tissue web T is guided with the permeable structured band 4.
  • the tissue web T is transferred to the press device 17 downstream of the permeable structured belt 4 to the drying cylinder 8.
  • the mechanical press device 17 is formed by a suction roll 6, which is arranged within an endless permeable dewatering belt 5 and is looped around by it in a partial region of its outer circumference, as well as a pressure roller 9.
  • the wrapping area is designated 37.
  • the permeable structured band 4 is guided together with the permeable dewatering belt 5 over a partial region of its circulation path, wherein this partial region at least partially encloses the wrap-around region 37 of the suction roller 6.
  • This section of the common guide describes a dewatering section 38.
  • the design is free of a press belt.
  • the press belt known from the prior art is here replaced by a counter roller in the form of the pressure roller 9, which forms a press nip 19 with the suction roller 6.
  • the suction roller 6 is either driven or indirectly driven by the drive of the permeable dewatering belt 5 with.
  • the suction roll 6 comprises for this purpose a rotatably mounted roll shell 20, which is rotatable about at least one fixed stationary suction zone 21.
  • the press nip 19 is positioned such that, viewed in the direction of passage of the tissue web T, it is arranged in the inlet region of the dewatering section 38 and thus the common guidance of the belts 4, 5, preferably viewed in the direction of passage of the tissue web T in the inlet region 22 into the suction zone 21 the mechanical dewatering in the initial area, in particular inlet region 22 of the suction zone 21 moves. Due to the consequent reduction of the moisture content, a downstream flow drying device 23 can be better effective.
  • a strong heating of the permeable structured strip 4 is eliminated and the open flow area for the through-flow drying device 23 is increased, in particular on the permeable structured band 4.
  • this arrangement is free of one, a contact pressure generating endlessly circulating belt, so that the mechanical pressing device 17 alone in the usual way by two operatively engageable rotatable surfaces is formed, between which to draining tissue web T is preferably passed between two endlessly circulating belts, here the permeable structured belt 4 and a permeable drainage belt 5.
  • a flow drying device 23 is provided, preferably in the form of a hot air blow box 10. This is preferably immediately downstream of the press nip 19 in the direction of passage and still effective in the extension region of the suction zone 21 with respect to the suction roll 6.
  • the range of action of the throughflow drying device 23 viewed in the direction of passage of the web can be considerably reduced due to the displacement and intensification of the mechanical dewatering at the beginning, in particular inlet region 22 of the suction zone 21 of the suction roller 6.
  • the mechanical load on the suction roller 6 and the required amount of vacuum air are also greatly reduced, so that the suction roller 6 can be reduced in size with the same drainage performance and thus identical to other suction rolls, such as a tissue web T leading and transferring suction roll 7 are performed on the heatable drying cylinder 8.
  • the local press nip load by the pressure roller 9 is much lower than the resultant force from the looping when forming the contact pressure via a press belt.
  • the tissue web T is continued with the permeable structured band 4 and transferred to a heatable drying cylinder 8.
  • the suction roll 7 also has at least one suction zone 32, which is arranged upstream of the press nip 30 in the guide direction of the tissue web T and thus before the entry into this safe guidance of the fibrous web, in particular tissue web T on the suction roll 7 and thus a proper transfer to the Drying cylinder 8 guaranteed.
  • FIG. 1b clarifies again in an enlarged view with reference to a detail view from the FIG. 1a the execution of the mechanical press device 17 according to the invention with downstream flow drying device 23 of the suction roller 6 is arranged below a water collecting tray 39 in an advantageous manner.
  • the design of the pressure roller 9 can take many forms. Preferably, this is designed and executed such that it is suitable for forming a so-called soft press nip 19.
  • the pressure roller 9 can according to FIG. 2a from a roll having a rigid roll shell 25 provided with an elastic cover 26.
  • the pressure roller 9 as a deflection compensating roller 13, for example with a rotatably mounted and driven elastic sheath 28, which is supported on a central support member 40 via means for deflection compensation, in particular pressing elements 41.
  • a corresponding adjusting device 42 is provided for controlling the contact force.
  • Figure 2c illustrates an embodiment of the pressure roller 9 designed as a shoe press roll 27.
  • the shoe press roll 27 is characterized by a flexible rotatable roll shell 43 which can be pressed against the suction roll 6 via a press shoe 24, which becomes effective on the inner circumference.
  • FIG. 3 By way of example, another particularly advantageous embodiment of the pressure roller on the drying cylinder 8 as a shoe press roll 33.
  • the shoe press roll 33 is upstream of the suction roll 7, to ensure optimum guidance and adherence to the structured permeable tape 4 to the transfer area on the drying cylinder 8.
  • FIG. 4 illustrates a further development of the detail view according to FIG. 1 b.
  • the pressing force applying pressure roller 9 is designed as a suction press roll 34.
  • This comprises a rotatable roll shell 44 which is rotatable about a stationary suction zone 35.
  • the stationary suction zone 35 is arranged such that it is preferably arranged upstream of the press nip 19 and does not form any overlap with the suction zone 21 on the suction roll 6.
  • the region of the suction zone 35 is looped around by the structured permeable band 4.
  • the press nip 19 is virtually ventilated via the pressure roller 9.
  • the covering, in particular the further second band 5 supporting the tissue web T in the form of the permeable dewatering belt is here already carried in the region of the suction zone 35 on the pressure roller 9 before it enters the press nip 19.
  • the course of a Crescentfilzbandes 11 is also shown by a broken line.
  • the device 101 can be used free of the press device 17 as a conventional crescent machine for smooth tissue types.
  • the individual components in particular the suction rolls 6, 7 or also the suction press roll 9 designed as a pressure roll, can be embodied in various ways.
  • Conceivable are embodiments with only one suction zone, which extends viewed in the direction of rotation of the roll shell over a portion of the circumference or with a plurality of zones connected in series.
  • FIGS. 1 to 4 An execution with only one zone is in the FIGS. 1 to 4 shown.
  • An embodiment with more than one zone, preferably two suction zones 21I, 21II, is exemplary in the FIG. 5 reproduced by the example of the suction roller 6.
  • the vacuum in the first zone 21I is preferably greater than in the second zone 21II.
  • the pressure roller 9 is arranged opposite to the first zone 21I, while the second zone 21II can be flowed through by a hot fluid, for example hot air or unsaturated steam, through the flow-through drying device 23.
  • FIG. 6 illustrates a particularly advantageous development of an embodiment according to FIG. 3
  • the shoe press roll 33 is arranged upstream of the suction roll 7 in order to provide optimum guidance and adhesion to the structured permeable tape 4 up to the transfer area, in particular the space formed between the pressure roll and the drying cylinder 8 To ensure transfer gap on the drying cylinder 8.
  • the same reference numbers are used for the same elements.
  • the arrangement of the device 101 for dewatering, in particular the means for applying a pressure on the two belts 4, 5 in the form of the device 36 takes place immediately in front of the inside of the loop formed by the permeable structured band 4 suction roll 7.
  • the structure the device 36 takes place in analogy to FIG.
  • the through-flow drying device 23 is here not associated with the suction roll 6 and thus immediately downstream of the press nip 19, but the device 36 downstream and within the loop formed by the permeable structured band 4 arranged suction roll 7, in particular their suction zone 32.
  • the distance X between drying device 18, in particular the bearing axis L8 of the heated drying cylinder 8 or a flow-through cylinder and with the axis of rotation of the Roll mantle of the suction roller 6 coincident bearing axis L6 in the machine direction MD is ⁇ 5m, preferably between 2 and 3m including.
  • a suction device 45 is disposed downstream of the press nip 19 for the secure transfer of the tissue web T through the permeable structured belt 4.
  • FIG. 7 a particularly advantageous further development according to FIG. 6 with design of the suction roller 7 as a pressure roller on the drying cylinder 8.
  • This design is characterized by a low number of components and low space requirement.

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EP08171455A 2008-02-04 2008-12-12 Dispositif de drainage de bandes de papier mouchoir Withdrawn EP2085515A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810000226 DE102008000226A1 (de) 2008-02-04 2008-02-04 Vorrichtung zur Entwässerung von Faserstoffbahnen, insbesondere Tissuebahnen

Publications (2)

Publication Number Publication Date
EP2085515A2 true EP2085515A2 (fr) 2009-08-05
EP2085515A3 EP2085515A3 (fr) 2011-06-29

Family

ID=40622190

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08171455A Withdrawn EP2085515A3 (fr) 2008-02-04 2008-12-12 Dispositif de drainage de bandes de papier mouchoir

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EP (1) EP2085515A3 (fr)
DE (1) DE102008000226A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012065804A1 (fr) * 2010-11-17 2012-05-24 Voith Patent Gmbh Dispositif et procédé de fabrication d'une bande de matériau
CN103987893A (zh) * 2011-12-08 2014-08-13 福伊特专利公司 用于制造薄纸的机器
EP3623525A1 (fr) * 2018-09-17 2020-03-18 Voith Patent GmbH Machine et procédé de fabrication d'une bande fibreuse
IT202100020858A1 (it) * 2021-08-03 2023-02-03 Toscotec S P A Macchina e processo per la produzione di carta strutturata.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105735026B (zh) * 2014-12-11 2019-08-09 福伊特专利有限公司 用于制造纤维材料腹板的机器

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005075736A2 (fr) 2004-01-30 2005-08-18 Voith Paper Patent Gmbh Systeme de deshydratation avance

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5904811A (en) * 1993-12-20 1999-05-18 The Procter & Gamble Company Wet pressed paper web and method of making the same
SE511485C2 (sv) * 1998-02-04 1999-10-04 Valmet Karlstad Ab Pappersmaskin och förfarande för framställning av en papppersbana
DE1156153T1 (de) * 2000-05-18 2002-10-02 Metso Paper Karlstad Ab Karlst Weichkrepp-papiermaschine und deren Pressenpartie
DE102005036891A1 (de) * 2005-08-05 2007-02-08 Voith Patent Gmbh Maschine zur Herstellung von Tissuepapier

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005075736A2 (fr) 2004-01-30 2005-08-18 Voith Paper Patent Gmbh Systeme de deshydratation avance

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012065804A1 (fr) * 2010-11-17 2012-05-24 Voith Patent Gmbh Dispositif et procédé de fabrication d'une bande de matériau
CN103328723A (zh) * 2010-11-17 2013-09-25 沃依特专利有限责任公司 用于制造材料幅的装置和方法
EP2712958A1 (fr) * 2010-11-17 2014-04-02 Voith Patent GmbH Dispositif et procédé de fabrication d'une bande de matière
CN103987893A (zh) * 2011-12-08 2014-08-13 福伊特专利公司 用于制造薄纸的机器
CN103987893B (zh) * 2011-12-08 2016-01-20 福伊特专利公司 用于制造薄纸的机器和压带
EP3623525A1 (fr) * 2018-09-17 2020-03-18 Voith Patent GmbH Machine et procédé de fabrication d'une bande fibreuse
IT202100020858A1 (it) * 2021-08-03 2023-02-03 Toscotec S P A Macchina e processo per la produzione di carta strutturata.
WO2023012843A1 (fr) * 2021-08-03 2023-02-09 Toscotec S.P.A. Machine et procédé destinés à la production de papier structuré

Also Published As

Publication number Publication date
EP2085515A3 (fr) 2011-06-29
DE102008000226A1 (de) 2009-08-06

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