WO2016016077A1 - Dispositif de déshydratation permettant la déshydratation d'une bande de matière fibreuse, procédé de déshydratation d'une bande de matière fibreuse ainsi que machine de production d'une bande de matière fibreuse - Google Patents

Dispositif de déshydratation permettant la déshydratation d'une bande de matière fibreuse, procédé de déshydratation d'une bande de matière fibreuse ainsi que machine de production d'une bande de matière fibreuse Download PDF

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Publication number
WO2016016077A1
WO2016016077A1 PCT/EP2015/066853 EP2015066853W WO2016016077A1 WO 2016016077 A1 WO2016016077 A1 WO 2016016077A1 EP 2015066853 W EP2015066853 W EP 2015066853W WO 2016016077 A1 WO2016016077 A1 WO 2016016077A1
Authority
WO
WIPO (PCT)
Prior art keywords
fibrous web
fabric
dewatering
suction roll
suction
Prior art date
Application number
PCT/EP2015/066853
Other languages
German (de)
English (en)
Inventor
Frank Opletal
Matthias Hoehsl
Robert Hilbing
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 WO2016016077A1 publication Critical patent/WO2016016077A1/fr

Links

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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/10—Suction rolls, e.g. couch rolls
    • D21F3/105—Covers thereof

Definitions

  • Dewatering device for dewatering a fibrous web for dewatering a fibrous web, method for dewatering a fibrous web and machine for producing a
  • the invention relates to a drainage device for dewatering a
  • Fibrous web according to the preamble of claim 1 and a method for dewatering a fibrous web according to the preamble of claim 13 and a machine for producing a fibrous web according to the preamble of claim 14.
  • a fibrous web in particular a tissue web
  • the material web is led to coverings over long stretches of the process and dewatered by means of various drainage devices.
  • An effective and cost effective drainage of the web while maintaining the essential properties of the fibrous web is one of
  • a portion of the dewatering can take place in that the fibrous web is passed over a suction roll.
  • This suction roll is connected to a vacuum device, whereby a part of the water is sucked out of the paper web.
  • WO 2005/075731 A2 proposes a dewatering device in which the paper web is pressed against the suction roll from the outside by means of further coverings.
  • Fiber web is pulled.
  • the drainage is also inefficient, since by sucking in false air an increased effort to maintain the vacuum level must be operated.
  • the invention is therefore an object of the invention to provide a drainage device available, the uniform and efficient drainage of the
  • Fiber web over a suction roll allowed, without negatively affecting the upstream or downstream process steps.
  • the object is achieved by a dewatering device according to claim 1, and a method for dewatering a fibrous web according to claim 13 and a machine for producing a fibrous web according to claim 14.
  • the dewatering device according to the invention for dewatering a fibrous web in particular a paper, board, pulp or tissue web, comprises a suction roll having a surface and an evacuated area, which is connected to at least one vacuum system.
  • This evacuated area may be designed as a continuous suction zone, or may also be subdivided into a plurality of suction zones, which are preferably arranged one behind the other as seen in the circumferential direction of the roller. It may be provided that each of the suction zones or at least some of the suction zones is each connected to its own vacuum system. As a result, different vacuums can also be present in the different suction zones via the evacuated area. Likewise, however, several or all suction zones can be connected to the same vacuum system.
  • the suction roll preferably has a multiplicity of bores through which the vacuum is passed on to the outside, or the water is sucked in from the fibrous web and the fabrics inwards.
  • the bores are usually arranged in the form of a regular or irregular drill pattern. Between the holes there are gaps, so-called webs.
  • the dewatering device comprises a first fabric, which is arranged in the region of the evacuated area between the fibrous web and the suction roll.
  • this first fabric is the supporting fabric which carries the fibrous web further through the system.
  • This first clothing can be, for example, a sieve or a felt.
  • the first fabric may be very thin, and have a thickness between 2mm to 6mm, more preferably between 2mm and 4mm.
  • the drainage device comprises at least one diffuser layer. The task of this diffuser layer is to equalize the vacuum applied to the holes before it reaches the fibrous web.
  • This diffuser layer is arranged according to the invention at least in the region of the evacuated area between the fibrous web and the surface of the suction roll.
  • This diffuser layer is not connected to the first stringing.
  • an equalization of the drainage can be achieved without the performance of the first string is negatively affected in other process steps.
  • the side of the fibrous web which faces the suction roll designates an inner side of the fibrous web, while the side facing away from the suction roll describes an outer side of the paper web.
  • the diffuser layer comprises a second fabric.
  • This covering is independent of the first covering.
  • the second fabric acts on the fibrous web only in the region of the evacuated region. It can therefore be made significantly shorter, for example, than the first clothing.
  • the second clothing extends at least in the region of the evacuated area between the suction roller and the first clothing.
  • the vacuum applied to the holes of the suction roll is equalized by the second fabric before it reaches the first fabric and then the fibrous web.
  • the second fabric is a circumferential felt.
  • the circulating felt can be guided for example in a felt loop over one or more guide rollers.
  • the circumferential felt is firmly connected to neither the suction roll nor with the first stringing.
  • the second fabric consists of a rotating sieve.
  • the rotating screen can be guided, for example, in a wire loop over one or more guide rollers.
  • the rotating sieve is firmly connected neither to the suction roll nor to the first clothing.
  • the rotating sieve is a fabric or a spiral sieve.
  • the second covering is a shrinkage screen.
  • the shrinkage screen is firmly connected to the suction roll.
  • the connection can be made, for example, positive or non-positive.
  • the circumferential sieve or the shrink sieve may consist wholly or at least predominantly of polymer material or of metal. It is provided according to the invention that a sieve comprises a single polymer or metal, or different polymers or metals.
  • the at least one diffuser layer comprises a layer of porous material which is firmly connected to the suction roll.
  • the connection can be done for example non-positively or positively.
  • the layer of porous material forms part of the suction roll, preferably the outermost layer of the suction roll.
  • the porous material comprises or consists of a foamed material, such as a metal foam or a polymer foam.
  • the surface of the suction roller in the region of the webs is at least partially provided with depressions.
  • These depressions may be designed as grooves in a preferred embodiment, but may be arbitrarily shaped. These depressions act as small suction lines, which the vacuum from the bore into the area of the webs into it distribute and thus increase the effective suction area. By this measure, the effect of the diffuser layer can be further increased.
  • the drainage device still comprises at least one additional outer fabric.
  • the drainage device comprises two outer fabrics.
  • the at least one outer fabric runs in the region of the evacuated region beyond the fibrous web. This means that the fibrous web extends in the region of the suctioned area between the suction roll and the at least one outer fabric.
  • the at least one outer covering is in an advantageous embodiment, a circumferential covering, which is guided over at least one guide roller, preferably a plurality of guide rollers. It can be provided in a particularly preferred embodiment of the invention that the at least one outer fabric is pressed against the suction roll.
  • the dewatering device according to the invention can be designed as an evacuated belt pressing device.
  • the drainage device comprises a device for providing water vapor, hot air or another gas.
  • the temperature of the steam, the hot air or the gas is at least 10 ° C, preferably at least 20 ° C, more preferably at least 40 ° C higher than the temperature of the fibrous web before the dewatering device.
  • the said device may be installed in an advantageous embodiment in the region of the evacuated area.
  • the water vapor, the hot air or the gas is applied from the outside, that is, by the vacuum of the suction roll, the water vapor, the hot air or the gas is sucked into the fibrous web, or even sucked through the fibrous web.
  • a second independent aspect of the invention relates to a method for dewatering a fibrous web, in particular a paper, board, pulp or tissue web. The inventive method is characterized in that at least one Part of the dewatering in a dewatering device according to any one of claims 1 -12 takes place, wherein the vacuum applied to the suction roll is made uniform by at least one diffuser layer.
  • a third independent aspect of the invention relates to a machine for producing a fibrous web, in particular a paper, board, pulp or tissue web.
  • the machine according to the invention comprises at least one dewatering device according to one of claims 1 to 12.
  • the machine further comprises at least one steam-heated cylinder, in particular a Yankee cylinder.
  • a Yankee cylinder usually has a very large diameter, preferably greater than two meters, more preferably greater than four meters.
  • Figure 1 shows a section not to scale through a drainage device according to the prior art
  • FIG. 2 shows a section which is not to scale through a drainage device according to the invention
  • FIG. 2A schematically shows a detail of a suction roll surface according to the invention.
  • FIG. 3 schematically shows an embodiment of a drainage device according to the invention
  • FIG. 4 schematically shows a further embodiment of a drainage device according to the invention.
  • Figures 1 and 2 show a section through a dewatering device, in the region of the evacuated area 8.
  • the Saugwalzenmantel 4 is provided with holes 5 through which the water which is removed from the fibrous web 1, is discharged.
  • the fibrous web 1 is supported in these two embodiments by a first fabric 2, which between the fibrous web 1 and the Suction roll jacket 4 is arranged.
  • This first fabric 2 may for example be a felt, but also a sieve or other clothing.
  • the effective suction region 6, which forms over the holes 5 it can be seen in the embodiment according to the prior art in FIG. 1 that the effective suction regions 6 of adjacent bores 5 do not overlap.
  • the fibrous web 1 is drawn directly over the holes 5, but between the holes 5 in the region of the webs there are zones in which the outgoing of the holes 5 vacuum, or the negative pressure is not effective. This leads to an uneven drainage of the fibrous web 1. On the one hand, wet zones remain in the area of the webs. On the other hand, the strong suction of the fibrous web 1 in the region of the effective suction region 6 causes channels to form, through which air is drawn. By sucking this false air, maintaining the vacuum level requires additional energy.
  • the felt used here as the first fabric 2 is comparatively thin with thicknesses in the range of less than 4 mm. A sufficient broadening of the effective suction region 6 by diffusion in this felt 2 is thus not possible.
  • a diffuser layer 3 is inserted according to the invention.
  • This may, for example, be a circulating felt, whereby this felt of the diffuser layer 3 may also be thicker than the felt of the first fabric 2.
  • a circumferential sieve or even a shrink sieve may be used as the diffuser layer 3.
  • FIG 2 A shows schematically the top view of an advantageous embodiment of the surface of the suction roller 7.
  • the holes 5 are designed as through holes 5, which pass through the wall of the suction roller 7, and by the vacuum or the vacuum of the vacuum system after is directed outside. These holes 5 are arranged in a certain drill pattern. The undrilled areas between the holes are called webs. In Figure 2A, these webs are provided with depressions 14. These depressions 14 are made so deep that they are not continuous as the holes 5, otherwise the stability of the roll shell would not be guaranteed.
  • FIG. 3 schematically shows a further embodiment of the drainage device according to the invention.
  • a circumferential fabric preferably a circumferential felt.
  • This covering is designed as an endless loop and is guided over one or more guide rollers 9.
  • the fibrous web 1 is supported here on a first fabric 2. This may, for example, be a felt or a sieve.
  • Both the first covering 2 and the diffuser layer 3 are arranged between the fibrous web 1 and the suction roll 7 or the evacuated area 8.
  • the evacuated area 8 is embodied in the example shown in FIG.
  • the drainage device in FIG. 3 comprises, beyond the fibrous web 1, two outer coverings 10a, 10b which are also guided over different guide rollers 9 again.
  • the one outer covering 10a can be a sieve, in particular a structured sieve, while the other outer covering 10b can be a sieve or another band.
  • the outer clothing 10a, 10b can be stretched, for example, so that they press against the suction roller and a Belt pressing device is created. This can be ensured inter alia by adjusting the guide rollers 9.
  • FIG. 1 An alternative embodiment of the dewatering device according to the invention is shown schematically in FIG.
  • a circumferential covering is arranged as a diffuser layer 3.
  • the suction roll 7 can be provided with a shrink sieve.
  • the diffuser layer 3 is arranged in the region of the suctioned region 8 between the suction roll 7 and a first fabric 2.
  • the evacuated area 8 is designed as a single suction zone 8a in the example shown in FIG.
  • the evacuated area 8 can also be subdivided into a plurality of suction zones 8a. At these suction zones 8a may be different vacuum or even the same vacuum.
  • the first fabric 2 is here, similar to that shown in Figure 2, a felt, often a thin felt with a thickness of less than 4 mm. Alternatively, as the first fabric 2 but also screens or other water-permeable fabrics can be used.
  • the fibrous web 1 is transported in this embodiment, supported on an outer fabric 10c in the dewatering device.
  • the dewatering device comprises a second outer fabric 10d, which is guided over a plurality of guide rollers 9 as a loop.
  • These two outer clothing 10c, 10d are positioned in the area of the evacuated area 8, viewed from this point, beyond the fibrous web 1. Similar to the embodiment in FIG. 3, the outer clothing 10c, 10d can be tensioned in such a way that it presses against the suction roller and a belt press device is created. This can be ensured inter alia by adjusting the guide rollers 9.
  • a device for providing water vapor, hot air or other gas is provided in the embodiment in Figure 4 with the steam and hot air hood 1 1, a device for providing water vapor, hot air or other gas.
  • This steam and hot air hood 1 1 is arranged in the region of the evacuated area 8 of the suction roller 7 opposite.
  • the first fabric 2, the diffuser layer 3, the fibrous web 1 and the outer clothing 10 c, 10 d as a sandwich pass through the gap between steam and Hot air hood 1 1 and suction roller 8.
  • the medium, eg steam is here applied to the outer fabric 10 d, and sucked by the negative pressure at the evacuated area 8 in the fibrous web 1 or through them.
  • the steam, or alternatively the air or another gas have a significantly higher temperature than the fibrous web 1.
  • the temperature difference is at least 10 ° C.
  • this temperature difference is more than 20 ° C or even more than 40 ° C.
  • the dewatering device shown in FIG. 4 may be part of a machine according to the invention for producing a fibrous web 1.
  • This here often also comprises a press 12, through which the fibrous web 1 is passed between the first fabric 2 and the outer fabric 10c and further dehydrated.
  • a Yankee cylinder is arranged over which the fibrous web 1 is guided.

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Abstract

L'invention concerne un dispositif de déshydratation permettant la déshydratation d'une bande de matière fibreuse (1), en particulier d'une bande de papier, de carton, de cellulose ou de tissu. Le dispositif comprend un cylindre aspirant (7) comportant une partie aspiration (8) qui peut comprendre une ou plusieurs zones aspirantes (8a) et qui est raccordée à au moins un système de vide. Un premier habillage (2) est en outre agencé dans la zone de la partie aspiration (8) entre la bande de matière fibreuse (1) et le cylindre aspirant (7). Le dispositif de déshydratation est caractérisé en ce qu'il comprend au moins une couche de diffusion (3) qui est agencée au moins dans la zone de la partie aspiration (8) entre la bande de matière fibreuse (1) et la surface du cylindre aspirant (7).
PCT/EP2015/066853 2014-08-01 2015-07-23 Dispositif de déshydratation permettant la déshydratation d'une bande de matière fibreuse, procédé de déshydratation d'une bande de matière fibreuse ainsi que machine de production d'une bande de matière fibreuse WO2016016077A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014215192.9 2014-08-01
DE102014215192.9A DE102014215192A1 (de) 2014-08-01 2014-08-01 Entwässerungseinrichtung zur Entwässerung einer Faserstoffbahn, Verfahren zur Entwässerung einer Faserstoffbahn sowie Maschine zur Herstellung einer Faserstoffbahn

Publications (1)

Publication Number Publication Date
WO2016016077A1 true WO2016016077A1 (fr) 2016-02-04

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Application Number Title Priority Date Filing Date
PCT/EP2015/066853 WO2016016077A1 (fr) 2014-08-01 2015-07-23 Dispositif de déshydratation permettant la déshydratation d'une bande de matière fibreuse, procédé de déshydratation d'une bande de matière fibreuse ainsi que machine de production d'une bande de matière fibreuse

Country Status (2)

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DE (1) DE102014215192A1 (fr)
WO (1) WO2016016077A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11098450B2 (en) 2017-10-27 2021-08-24 Albany International Corp. Methods for making improved cellulosic products using novel press felts and products made therefrom

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005075731A2 (fr) * 2004-01-30 2005-08-18 Voith Paper Patent Gmbh Appareil de deshydratation de machine a papier
US20080210397A1 (en) * 2004-01-30 2008-09-04 Thomas Thoroe Scherb Press Section and Permeable Belt in a Paper Machine
EP2090691A1 (fr) * 2008-02-01 2009-08-19 Voith Patent GmbH Dispositif de fabrication de bandes de tissu
DE202009007365U1 (de) * 2008-05-23 2009-10-15 Metso Paper, Inc. Siebstrumpf zum Einsatz in Verbindung mit einer Formier- oder Saugwalze einer Papier- oder Kartonmaschine
DE102010039456A1 (de) * 2010-08-18 2012-02-23 Voith Patent Gmbh Vorrichtung zur Herstellung einer Materialbahn
WO2013153141A1 (fr) * 2012-04-11 2013-10-17 Voith Patent Gmbh Rouleau et son procédé de fabrication

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3399111A (en) * 1966-12-01 1968-08-27 Huyck Corp Supplemental belt in combination with an endless belt in papermaking and method of installing the supplemental belt
FI104001B (fi) * 1998-06-26 1999-10-29 Valmet Corp Kuivatusosa
US7527709B2 (en) * 2006-03-14 2009-05-05 Voith Paper Patent Gmbh High tension permeable belt for an ATMOS system and press section of paper machine using the permeable belt

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005075731A2 (fr) * 2004-01-30 2005-08-18 Voith Paper Patent Gmbh Appareil de deshydratation de machine a papier
US20080210397A1 (en) * 2004-01-30 2008-09-04 Thomas Thoroe Scherb Press Section and Permeable Belt in a Paper Machine
EP2090691A1 (fr) * 2008-02-01 2009-08-19 Voith Patent GmbH Dispositif de fabrication de bandes de tissu
DE202009007365U1 (de) * 2008-05-23 2009-10-15 Metso Paper, Inc. Siebstrumpf zum Einsatz in Verbindung mit einer Formier- oder Saugwalze einer Papier- oder Kartonmaschine
DE102010039456A1 (de) * 2010-08-18 2012-02-23 Voith Patent Gmbh Vorrichtung zur Herstellung einer Materialbahn
WO2013153141A1 (fr) * 2012-04-11 2013-10-17 Voith Patent Gmbh Rouleau et son procédé de fabrication

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11098450B2 (en) 2017-10-27 2021-08-24 Albany International Corp. Methods for making improved cellulosic products using novel press felts and products made therefrom

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Publication number Publication date
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