WO2021219272A1 - Machine de fabrication ou de traitement de voile fibreux - Google Patents

Machine de fabrication ou de traitement de voile fibreux Download PDF

Info

Publication number
WO2021219272A1
WO2021219272A1 PCT/EP2021/053830 EP2021053830W WO2021219272A1 WO 2021219272 A1 WO2021219272 A1 WO 2021219272A1 EP 2021053830 W EP2021053830 W EP 2021053830W WO 2021219272 A1 WO2021219272 A1 WO 2021219272A1
Authority
WO
WIPO (PCT)
Prior art keywords
press
section
dryer
drying
fibrous web
Prior art date
Application number
PCT/EP2021/053830
Other languages
German (de)
English (en)
Inventor
Johann Moser
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 WO2021219272A1 publication Critical patent/WO2021219272A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/18—Drying webs by hot air
    • 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 machine for producing or treating a fibrous web, in particular a paper or cardboard web, with a wire section, a press section and a dryer section.
  • corrugated cardboard base paper can be produced in a stable manner at machine speeds of more than 1500 to a maximum of 1650 m / min. Stable here means production with a runtime efficiency> 90%.
  • the machine speed can be further increased by approx. 100 to 150 m / min to approx. 1800 m / min without any loss of runtime efficiency.
  • Papers contaminated with adhesive particles can be almost completely freed from stickies on the web surface by means of impingement flow or impingement air technology.
  • the hot impact air T> 200 ° C evaporates the adhesive particles and thus cleans the paper surface. This circumstance would be of great importance for the use of waste paper, if the hypothesis is correct, which has so far been reliably confirmed in practice.
  • the previous solutions mentioned have a number of disadvantages.
  • a transfer wire group is required, which brings with it a further pick-up or removal position for the paper web.
  • Such a further removal position not only requires a more complex structure of the paper machine, it also represents a potential disturbance point which can lead to breaks, creases, a machine crash or the like. There is always the risk that the edges of the web will fold down, which leads to web breaks and results in a lower running time efficiency.
  • the invention is based on the object of specifying a machine of the type mentioned at the beginning with which the advantages of the previous solutions are obtained, but whose disadvantages are eliminated in the simplest and most efficient way possible.
  • the machine according to the invention for producing or treating a fibrous web comprises a wire section, a press section and a dryer section.
  • the fibrous web is taken over by a first revolving dryer wire of the dryer section from a revolving lower clothing guided through the last press nip of the press section.
  • the fibrous web is then guided generally vertically upwards along an impingement drying section, along which the underside of the fibrous web is dried by at least one impingement dryer.
  • the underside of the fibrous web is to be understood as the side of the fibrous web that is connected to the through the last press nip of the press section was in contact with the circumferential lower covering that was guided.
  • the upper side is the side of the fibrous web opposite this lower side.
  • the previously required transfer wire group for transferring the fibrous web from the press section to the dryer section is no longer necessary. Since the fibrous web no longer has to be suspended from a transfer screen or transferred with an overhead web guide, the risk of the web edges folding down is eliminated, so that the risk of web breaks is also minimized and the runtime efficiency is increased accordingly. In addition, the transmission time is shortened. In addition, the lower covering of the last press nip of the press section, which is used for the transfer, in combination with the vertical impingement drying, significantly reduces the number of nip passes and enables very high production times from belt change to belt change, which results in less downtime or downtime.
  • the lower covering of the last press nip of the press section which is used to transfer the fibrous web from the press section to the dryer section, can be relatively heavy and relatively stiff, so that it is difficult to manipulate. Since the fibrous web to be removed from the lower covering of the last press nip of the press section is on top, there is better runability.
  • the more compact design of the machine is also an advantage. With impingement flow or impingement air drying, hot air is blown from nozzles at high speed onto the fibrous web. The hot air gives off heat and absorbs the resulting water vapor.
  • the lower clothing guided through the last press nip of the press section preferably comprises a transfer belt.
  • This transfer belt can be relatively long in order to facilitate the transfer to the first dryer fabric of the dryer section.
  • the transfer tape can be water-impermeable or water-permeable, whereby it is preferably water-impermeable.
  • the fibrous web is expediently taken over by the lower clothing guided through the last press nip of the press section in the area of a suction roll looped around by the first dryer wire of the dryer section. A reliable transfer of the fibrous web to the first dryer fabric is guaranteed by the suction guide roll.
  • At least two, preferably at least three, impingement dryers are advantageously provided along the impingement drying section.
  • the underside of the fibrous web is thus dried by an impingement flow over a relatively long impingement-flow drying section, as a result of which efficient drying is achieved.
  • the first dryer wire of the drying section is guided along the impingement drying section on its side opposite the at least one impingement dryer, advantageously via support rollers and / or stabilizers, in particular stabilizer boxes, which are subjected to negative pressure.
  • the fibrous web is expediently taken over from the first dryer fabric by a second circulating dryer fabric of the dryer section.
  • the fibrous web is taken over by the first dryer fabric in the area of a suction roll looped around by the second dryer fabric of the dryer section, which ensures reliable transfer to the second dryer fabric.
  • the fibrous web is guided together with the second dryer wire of the drying section along a further impingement drying section, along which the upper side of the fibrous web is dried by at least one further impingement dryer. The fact that the upper side of the fibrous web is also dried by an impingement flow results in an even, more efficient drying of the fibrous web.
  • At least two further impingement dryers can advantageously be provided along the further impingement drying section, with at least three or four further such impingement dryers preferably being provided.
  • the second dryer wire of the drying section along the further impingement drying section is on its side opposite the at least one impingement dryer, preferably again via support rollers and / or stabilizers, in particular stabilizer boxes, which are subjected to negative pressure , guided.
  • the last press nip of the press section is advantageously elongated in the direction of travel of the web, whereby it is preferably formed by a shoe press nip. With such an extended or shoe press nip, there is a gentler and more efficient dewatering of the fibrous web.
  • the fibrous web is passed through the last press nip between the lower covering and a preferably water-absorbing press felt, which wraps around an overhead shoe press roll.
  • the shoe press nip is preferably formed between an overhead shoe press roll and a lower counter roll of a shoe press wrapped around by the lower covering.
  • the mean line force of such a wide-nip press can be> 950 kN / m, in particular> 1200 kN / m.
  • the fibrous web which is guided around the counter roll of the shoe press together with the lower covering, is acted upon by the steam of at least one steam box, in particular high-performance steam box, in the area of the counter roll in front of the shoe press nip.
  • This allows the dewatering performance in the shoe press to be increased accordingly.
  • an additional press roll with an additional, water-absorbing covering wrapped around it can be provided to form an additional press nip through which the lower covering, the fibrous web and the additional, water-absorbing covering run.
  • the press section comprises at least two further press nips in addition to the last press nip, with two counter-rollers and the fibrous web being assigned to a central press roll wrapped around by a circumferential upper press felt to form a first press nip and a second press nip following in the direction of travel of the web is passed through the first press nip between the circumferential upper press felt and a circumferential lower press felt through the first press nip and between the upper circumferential press felt looping around the central press roll and the circumferential lower covering of the last press nip of the press section through the second press nip.
  • a suction press roll for example, can be provided as the central press roll.
  • the central press roll and the counter roll are preferably arranged at a distance.
  • the first and the second press nip are formed by shoe press nips of a duo-centri-NipcoFlex press comprising a central deflection adjusting roller.
  • the line forces of the relevant press nips can be variably adjusted across the width.
  • the fibrous web is preferably taken over by the upper press felt wrapping around the central press roll from a forming wire of the wire section.
  • the fibrous web is preferably taken over from the second drying wire by a circulating drying wire of an in particular single-row drying group.
  • the single figure of the drawing shows an exemplary embodiment of a machine 10 for producing or treating a fibrous web, which can in particular be a paper or cardboard web.
  • the machine 10 comprises a wire section 12, a press section 14 and a dryer section 16.
  • the machine or web running direction is indicated in the figure by an “L”.
  • the fibrous web is taken over by a first revolving dryer wire 20 of the drying section 16 from a revolving lower clothing 22 guided through the last press nip 18 of the press section 14. Subsequently, the fibrous web together with the first dryer wire 20 of the drying section 16 is guided generally vertically upwards along an impingement drying section 24, along which the underside of the fibrous web is dried by at least one impingement dryer 24 '.
  • the lower clothing 22 guided through the last press nip 18 of the press section 14 comprises a transfer belt.
  • This transfer tape can be water-impermeable or water-permeable, whereby it is preferably water-impermeable.
  • the fibrous web is taken over in the area of a suction guide roller 28 looped around by the first dryer wire 20 of the dryer section 16 by the lower clothing 22 guided through the last press nip 18 of the press section 14.
  • impingement dryers 24 are provided along the impingement drying section.
  • more or fewer impingement flow dryers are also conceivable.
  • the first drying wire 20 of the drying section 16 is along the impingement drying section 24 on its side opposite the impingement dryers 24 'via support rollers 30 and subjected to negative pressure Out stabilizers 32, which in the present case are, for example, stabilizer boxes.
  • the fibrous web is taken over by a second circulating dryer wire 34 of the dryer section 16 from the first dryer wire 20.
  • the transfer takes place in the area of a suction guide roller 36 looped around by the second drying wire 34 of the drying section 16.
  • the fibrous web is guided together with the second dryer wire 34 of the drying section 16 along a further impingement drying section 38, along which the upper side of the fibrous web is dried by at least one further impingement dryer 38 '.
  • a further impingement drying section 38 along which the upper side of the fibrous web is dried by at least one further impingement dryer 38 '.
  • four such further impingement dryers 38 ' are provided. In principle, however, more or fewer further impingement dryers 38 'can also be provided.
  • the second drying wire 34 of the drying section 16 is guided along the further impingement drying section 38 on its side opposite the impingement dryers 38 'over support rollers 42 and stabilizers 44 subjected to negative pressure, which in the present case are again stabilizer boxes, for example.
  • the last press nip 18 of the press section 14 is elongated in the web running direction L and in the present case is formed by a shoe press nip.
  • this shoe press nip 18 is between an overhead shoe press roll 46, which is wrapped by a water-absorbing press felt, and one of the lower one Covering 22 wrapped underlying counter roll 48 of a shoe press is formed.
  • the fibrous web guided together with the lower covering 22 around the counter roll 48 of the shoe press 46, 48 in the area of the counter roll 48 in front of the shoe press nip 18 is acted upon by the steam of at least one steam blower box 50, which is in particular a high-performance Steam box can act.
  • the press section 14 includes, for example, two further press nips 52, 54.
  • a central press roll 58 wrapped around a circumferential upper press felt 56 to form a first press nip 52 and a second press nip 54 following in the web running direction L are two counter rolls 60, 62 assigned.
  • the fibrous web is between the circumferential upper press felt 5 and a circumferential lower press felt 64 through the first press nip 52 and between the upper circumferential press felt 56 wrapping around the central press roller 58 and the circumferential lower covering 22 of the last press nip 18 of the press section 14 through the second press nip 54 guided.
  • a suction press roll can be provided as the central press roll 58.
  • the first and the second press nip are formed by shoe press nips of a duo-centri-NipcoFlex press comprising a central deflection adjusting roller.
  • the line forces of the relevant press nips can be variably adjusted across the width.
  • the fibrous web is taken over by a forming wire 66 of the wire section 12 by the upper press felt 56 looping around the central press roll 58.
  • the fibrous web is taken over from the second drying wire 34 by a circulating drying wire 68 of a drying group 70.
  • the drying group 70 is, for example, a single-tier drying group with drying cylinders 72 located above and suction deflection rollers 74 located below, around which the drying wire 68 is guided.
  • this lower covering can be assigned, as shown, for example a floch pressure spray tube 76, a so-called DuoCleaner 78 with a rotating cleaning head or a cleaning boot and a scraper 80.
  • a DuoCleaner with a cleaning boot is used as the DuoCleaner 78
  • the cleaning boot can stand still at a position above the lower covering 22 until a defined number of covering revolutions has been reached. The cleaning boot is then relocated and moved across its working width across the lower covering 22.
  • the DuoCleaner which is equipped with a cleaning boot, moves continuously back to the opposite side of the machine at increased speed and is freed from adhering dirt particles there by a cleaning station.
  • the cycle either starts again immediately afterwards or after a specified waiting time.
  • the floor of the machine 10 is denoted by 82 and the basement or the zero level is denoted by 84.

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  • Paper (AREA)

Abstract

La présente invention concerne une machine de fabrication ou de traitement d'un voile fibreux, en particulier un voile de papier ou de carton, comprenant une section de fil, une section de pressage et une section de séchage. Ici, le voile fibreux est placé au-dessus de la dernière ligne de contact de la section de pressage au moyen d'une première toile sécheuse en circulation de la section de séchage à partir d'une toile inférieure en circulation qui est guidée à travers la dernière ligne de contact de la section de pressage. Conjointement avec la première toile sécheuse de la section de séchage, le voile fibreux est guidé de manière généralement verticale vers le haut le long d'une section de séchage par impact, le long de laquelle le côté inférieur du voile fibreux est séché au moyen d'au moins un séchoir à impact.
PCT/EP2021/053830 2020-04-30 2021-02-17 Machine de fabrication ou de traitement de voile fibreux WO2021219272A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020111746.9A DE102020111746A1 (de) 2020-04-30 2020-04-30 Maschine zur herstellung oder behandlung einer faserstoffbahn
DE102020111746.9 2020-04-30

Publications (1)

Publication Number Publication Date
WO2021219272A1 true WO2021219272A1 (fr) 2021-11-04

Family

ID=74668848

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2021/053830 WO2021219272A1 (fr) 2020-04-30 2021-02-17 Machine de fabrication ou de traitement de voile fibreux

Country Status (2)

Country Link
DE (1) DE102020111746A1 (fr)
WO (1) WO2021219272A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021114930B3 (de) 2021-06-10 2022-10-13 Voith Patent Gmbh Maschine zur herstellung oder behandlung einer faserstoffbahn
DE102022112334A1 (de) 2022-05-17 2023-09-21 Voith Patent Gmbh Maschine und Verfahren zur Herstellung oder Behandlung einer Wellpappenrohpapierbahn mit einem Randbeschnitt in einer Trockenpartie
DE102022127695A1 (de) 2022-10-20 2024-02-29 Voith Patent Gmbh Maschine und Verfahren zur Herstellung oder Behandlung einer Wellpappenrohpapierbahn mit verkürzten Trockensieben
DE102023101607A1 (de) 2023-01-24 2024-03-07 Voith Patent Gmbh Maschine zur Herstellung oder Behandlung einer Faserstoffbahn
DE102023101610A1 (de) 2023-01-24 2024-06-13 Voith Patent Gmbh Maschine und Verfahren zur Herstellung oder Behandlung einer Faserstoffbahn

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1072722A2 (fr) * 1999-07-27 2001-01-31 Voith Paper Patent GmbH Section de séchage
DE10083529B4 (de) * 1999-11-17 2007-03-08 Andritz Ag Vorrichtung zur Entwässerung einer Faserstoffbahn
DE102007021879A1 (de) * 2007-05-10 2008-11-13 Voith Patent Gmbh Pressenanordnung und Maschine zur Herstellung einer Faserstoffbahn
DE102007038133A1 (de) * 2007-08-13 2009-02-19 Voith Patent Gmbh Vorrichtung zur Herstellung einer Faserstoffbahn, insbesondere Papier-, Karton- oder Tissuebahn

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19841768A1 (de) 1998-09-11 2000-03-16 Voith Sulzer Papiertech Patent Trockenpartie
DE102005031202A1 (de) 2005-07-01 2007-01-25 Voith Patent Gmbh Verfahren zur Herstellung einer Papierbahn, insbesondere Tiefdruckpapier
FI122925B (fi) 2009-12-23 2012-08-31 Metso Paper Inc Järjestely ja menetelmä kuiturainan päällepuhalluskuivaimen yhteydessä

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1072722A2 (fr) * 1999-07-27 2001-01-31 Voith Paper Patent GmbH Section de séchage
DE10083529B4 (de) * 1999-11-17 2007-03-08 Andritz Ag Vorrichtung zur Entwässerung einer Faserstoffbahn
DE102007021879A1 (de) * 2007-05-10 2008-11-13 Voith Patent Gmbh Pressenanordnung und Maschine zur Herstellung einer Faserstoffbahn
DE102007038133A1 (de) * 2007-08-13 2009-02-19 Voith Patent Gmbh Vorrichtung zur Herstellung einer Faserstoffbahn, insbesondere Papier-, Karton- oder Tissuebahn

Also Published As

Publication number Publication date
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