WO2022258262A1 - Machine de fabrication ou de traitement de nappe fibreuse - Google Patents

Machine de fabrication ou de traitement de nappe fibreuse Download PDF

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Publication number
WO2022258262A1
WO2022258262A1 PCT/EP2022/061900 EP2022061900W WO2022258262A1 WO 2022258262 A1 WO2022258262 A1 WO 2022258262A1 EP 2022061900 W EP2022061900 W EP 2022061900W WO 2022258262 A1 WO2022258262 A1 WO 2022258262A1
Authority
WO
WIPO (PCT)
Prior art keywords
section
press
dryer
fibrous web
guided
Prior art date
Application number
PCT/EP2022/061900
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
Priority to EP22727293.7A priority Critical patent/EP4352297A1/fr
Publication of WO2022258262A1 publication Critical patent/WO2022258262A1/fr

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
    • 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
    • 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

Definitions

  • the invention relates to a machine for producing or treating a fibrous web, in particular paper or cardboard web, with a wire section, a press section and a drying section.
  • Conventional high-performance paper machines usually have a closed web run or web run without free draft between the press section and the pre-dryer section.
  • the paper web is taken over by a dryer fabric of the first dryer group either from a transfer belt or a felt.
  • the paper web is preferably removed from a lower skin. This is also the case, among other things, with machines for the production of corrugated base paper.
  • corrugated base paper can be produced stably at machine speeds of over 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 200 m/min to around 1850 m/min without loss of runtime efficiency.
  • Paper contaminated with adhesive particles can be almost completely freed from stickies on the web surface using impingement flow or impingement air technology.
  • the hot impact air T > 200°C
  • T > 200°C will vaporize the adhesive particles and thus clean the paper surface. This circumstance would be of great importance for the use of waste paper if the hypothesis, which has so far been reliably confirmed in practice, is correct.
  • the previous solutions mentioned have a number of disadvantages.
  • a transfer wire group is required to transfer the paper web from the press section to the dryer section, which entails an additional pick-up or take-off position for the paper web.
  • a further removal position not only requires a more complex construction of the paper machine, it also represents a potential point of failure that can lead to tears, creases, a machine crash or the like. There is always the danger that the edges of the web will fold over, leading to web breaks and a lower transit time efficiency.
  • the invention is based on the object of specifying a machine of the type mentioned at the outset, with which the advantages of the previous solutions are retained, but whose disadvantages are eliminated in the simplest and most efficient manner possible.
  • the machine according to the invention for producing or treating a fibrous web, in particular paper or cardboard web comprises a wire section, a press section and a drying section. Following the last press nip of the press section, the fibrous web is taken over by a first circulating dryer fabric of the dryer section from a circulating lower fabric guided through the last press nip of the press section.
  • the fibrous web then along an impingement drying section, along which the underside of the fibrous web is dried by at least one impingement dryer, generally vertically upwards and wherein the fibrous web is taken over by the lower skin guided through the last press nip of the press section in the region of a suction guide roll wrapped by the first dryer wire of the dryer section and with a sandwich area being formed before this transfer, in which the fibrous web can be guided between the lower skin and the first drying wire.
  • the underside of the fibrous web is to be understood as meaning the side of the fibrous web that was in contact with the peripheral lower skin that was passed through the last press nip of the press section.
  • the top is the side of the fibrous web opposite this bottom.
  • the sandwich area covers part of the distance between the last press nip of the press section and the suction guide roll. Because the fibrous web is covered on both sides by the first dryer fabric and the lower skin, the fibrous web can be guided in a stable manner. By this measure, the distance on which the fibrous web is only supported by the lower skin and the upper side is free can be shortened. Air forces therefore have less surface area to act on, in particular on the edges of the fibrous web. Tears and creases can thus be significantly reduced or even avoided.
  • the previously required transfer wire group for transferring the fibrous web from the press section to the dryer section is no longer required. Since the fibrous web no longer has to be transferred hanging on a transfer screen or with an overhead web guide, the risk of the web edges folding off is eliminated, so that the risk of web breaks is minimized and the transit time efficiency is increased accordingly. In addition, the transmission delay is reduced. In addition, the lower covering of the last press nip of the press section, which is used for transfer, in combination with vertical impingement drying The number of nip passes is significantly reduced and very high production times from sliver change to sliver change are possible, which results in less downtime or downtime.
  • the bottom fabric of the last press nip of the press section used to transfer the fibrous web from the press section to the dryer section, can be relatively heavy and relatively stiff, making it difficult to manipulate. Since the fibrous web to be removed from the lower clothing of the last press nip of the press section is on top, the runability is better. The more compact design of the machine is also an advantage. With impingement flow or impingement air drying, hot air is blown onto the fibrous web from nozzles at high speed. The hot air gives off heat and absorbs the resulting water vapor.
  • the lower skin 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 and in order to obtain the longest possible first impingement air drying section. This has a positive effect on the drying capacity.
  • the transfer tape can be water-impermeable or water-permeable, it being preferably water-impermeable.
  • the lower skin guided through the last press nip of the press section can comprise a water-permeable felt belt. This can bring advantages in terms of reliable web guidance and greater dewatering of the fibrous web.
  • the lower skin between the last press nip and the suction guide roll is guided over support rolls to form a preferably polygonal running path.
  • the multiple support rollers are within the loop formed by the lower skin according to the design arranged in a polygon-like walkway.
  • the polygon-like running path of the lower clothing is preferably linear between the adjacent support rollers and there is a change in direction on at least one support roller.
  • the area of the polygonal path can also extend into the sandwich area or only be formed there. However, the entire sandwich area can also be designed exclusively linear.
  • a peripheral upper skin that is guided through the last press nip of the press section is designed as a felt, in particular as a press felt, and the first felt guide roller after the last press nip is arranged in such a way that the felt together with the lower skin, which is designed as a water-permeable felt, for example, form a forms the second sandwich area for guiding the fibrous web.
  • This variant also contributes to a stable web run.
  • a support roller with suction can be arranged in the area of the second sandwich area. This enables the fibrous web to run along safely with the lower covering.
  • 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 impingement flow over a relatively long impingement drying section, thereby achieving efficient drying.
  • the first dryer wire of the dryer section is along the impingement flow drying section on its side opposite the at least one impingement flow dryer advantageously via support rollers and/or stabilizers subjected to or generating negative pressure, in particular stabilizer boxes.
  • 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 wrapped by the second dryer fabric of the dryer section, thereby ensuring reliable transfer to the second dryer fabric.
  • the fibrous web is guided together with the second dryer fabric 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. Since the upper side of the fibrous web is also dried by an impingement flow, the fibrous web is dried more evenly and efficiently.
  • At least two further impingement dryers can be provided along the further impingement-flow drying section, with at least three or four further such impingement-flow dryers preferably being provided.
  • the second dryer fabric of the drying section is preferably overturned along the further impingement flow drying section on its side opposite the at least one impingement flow dryer Support rollers and/or stabilizers, in particular stabilizer boxes, acted upon by negative pressure.
  • the last press nip of the press section is extended in the direction of web travel, it being preferably formed by a shoe press nip.
  • a shoe press nip With such an extended or shoe press nip, the fibrous web is dewatered more gently and efficiently.
  • the fibrous web is guided through the last press nip lying between the lower skin and a preferably water-absorbing press felt, which wraps around an overhead shoe press roll.
  • the shoe press nip is preferably formed between an upper shoe press roll and a lower backing roll of a shoe press around which the lower skin is wrapped.
  • the mean linear force of such a wide nip press can be >950 kN/m, in particular >1200 kN/m.
  • the fibrous web guided together with the lower clothing around the backing roll of the shoe press is acted upon in the area of the backing roll before the shoe press nip by the steam of at least one steam blower box, in particular a high-performance steam blower box.
  • the dewatering performance in the shoe press can be increased accordingly.
  • an additional press roll with an additional, water-absorbing fabric wrapped around it can be provided to form an additional press nip through which the lower fabric, the fibrous web and the additional, water-absorbing fabric run.
  • the press section comprises, in addition to the last press nip, at least two further press nips, with two counter-rollers preferably being assigned to a central press roll around which a circulating upper press felt is wrapped to form a first press nip and a second press nip following in the direction of web travel, and the fibrous web between the circulating upper press felt and a circulating lower press felt through the first press nip and between the upper circulating press felt wrapping around the central press roll and the circulating lower clothing of the last press nip of the press section is guided through the second press nip.
  • This ensures optimal dewatering of the fibrous web with a relatively compact design of the press section.
  • a suction press roller for example, can be provided as the central press roller.
  • the central press roll and the backing roll of the last press nip are preferably spaced apart.
  • the first and the third (last) press nip are formed by shoe press nips of a so-called Duo-NipcoFlex press comprising a central deflection-adjustable roll.
  • the linear forces of the relevant press nips can be variably adjusted across the width.
  • the fibrous web is preferably taken over by a forming fabric of the fabric section through the upper press felt wrapping around the central press roll.
  • the press section comprises a so-called DuoZentriNipcoFlex press with a transfer belt.
  • the central press roll and the backing roll of the last press nip are not spaced apart, but form the second press nip.
  • the press section also includes at least two further press nips, with two counter-rollers preferably being assigned to a central press roll around which a circulating upper press felt is wrapped, to form a first press nip and a second press nip that follows in the direction of web travel, and the fibrous web between the circulating upper press felt and one circulating lower press felt is guided through the first press nip and between the upper circulating press felt wrapping around the central press roll and the circulating lower skin of the last press nip of the press section through the second press nip.
  • the backing roll of the second press nip is formed by the backing roll of the shoe press of the third press nip.
  • the central roll is preferably designed as a suction press roll.
  • the lower covering is designed as a transfer belt.
  • the press section comprises a Tanden NipcoFlex press.
  • This includes two separate presses arranged one behind the other with extended press nips.
  • the press nips are preferably each formed by a shoe roll and a counter roll.
  • the lower skin wraps around the backing roll of the last, ie the second press nip.
  • the lower covering can be designed as a transfer belt or as a felt belt.
  • the fibrous web is preferably taken over by a circulating dryer fabric of a particularly single-row dryer group from the second dryer fabric.
  • FIG. 1 shows an exemplary embodiment of a machine 10 for laying or treating a fibrous web, which can in particular be a paper or cardboard web or packaging paper web.
  • the machine 10 comprises a wire section 12, a press section 14 and a dryer section 16.
  • the machine or web direction is indicated in FIG. 1 with “L”.
  • the fibrous web is taken over by a first circulating dryer fabric 20 of the dryer section 16 from a circulating lower fabric 22 guided through the last press nip 18 of the press section 14 .
  • the fibrous web, together with the first dryer wire 20 of the drying section 16 is then fed generally vertically upwardly along an impingement drying section 24 along which the underside of the fibrous web is dried by at least one impingement dryer 24'.
  • the fibrous web is taken over by the lower skin 22 guided through the last press nip 18 of the press section 14 in the region of a suction guide roll 28 around which the first dryer fabric 20 of the dryer section 16 is wrapped.
  • a sandwich area 23 is formed before this takeover, in which the fibrous web can be guided between the lower skin 22 and the first drying fabric 20 .
  • the lower skin 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, it being preferably water-impermeable.
  • the fibrous web is taken over by the lower skin 22 guided through the last press nip 18 of the press section 14 in the region of a suction guide roll 28 around which the first dryer fabric 20 of the dryer section 16 is wrapped.
  • the lower skin 22 is preferably guided between the last press nip 18 and the suction guide roll 28 over support rolls 31 to form a preferably polygonal path.
  • the several support rollers 31 are arranged within the loop formed by the lower skin 22 in accordance with the formation of a polygonal running path.
  • the polygon-like running path of the lower clothing 22 is preferably linear between the adjacent support rollers 31 and there is a change in direction on at least one support roller.
  • the area of the polygonal path can also extend into the sandwich area 23 or only be formed there. However, the entire sandwich area 23 can also be configured exclusively in a linear manner.
  • the sandwich area 23 begins in the area of a dryer wire guide roll 21 arranged within the loop of the first dryer fabric 20 and ends in the area of the suction guide roll 28.
  • the dryer wire guide roll 21 can be arranged in such a way that the first dryer fabric 20 touches the fibrous web or is at a distance from it.
  • a peripheral upper skin 19 guided through the last press nip 18 of the press section 14 is designed as a felt, in particular as a press felt.
  • a trough for receiving water that has been pressed out.
  • impingement dryers 24' are provided along the impingement drying section.
  • more or fewer impingement flow dryers are also conceivable.
  • the first drying fabric 20 of the drying section 16 is guided along the impingement drying section 24 on its side opposite the impingement dryers 24 ′ over support rolls 30 and stabilizers 32 subjected to negative pressure, which in the present case are stabilizer boxes, for example.
  • the fibrous web is taken over by a second circulating dryer fabric 34 of the dryer section 16 from the first dryer fabric 20 .
  • the transfer takes place in the area of a suction guide roll 36 wrapped around by the second dryer fabric 34 of the dryer section 16.
  • the fibrous web is then 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 additional impingement dryers 38' are provided.
  • more or fewer further impingement flow dryers 38' can also be provided.
  • the second dryer fabric 34 of the dryer 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 which are subjected to negative pressure or generate negative pressure and which in the present case are again stabilizer boxes, for example.
  • the last press nip 18 of the press section 14 is extended in the web running direction L and is formed in the present case by a shoe press nip.
  • this shoe press nip 18 is formed between an overhead shoe press roll 46, which is wrapped by a water-absorbing press felt, and a bottom counter-roll 48 of a shoe press, wrapped by the lower skin 22.
  • the fibrous web which is guided together with the lower skin 22 around the backing roll 48 of the shoe press 46, 48, is acted upon in the region of the backing roll 48 before the shoe press nip 18 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 comprises, for example, two further press nips 52, 54.
  • a central press roll 58 around which a rotating upper press felt 56 is wrapped to form a first press nip 52 and a second press nip 54 that follows in the direction of web travel L are two counter rolls 60, 62 assigned.
  • the fibrous web is between the encircling upper press felt 5 and a encircling lower press felt 64 through the first press nip 52 and between the upper encircling press felt 56 wrapping around the central press roll 58 and the encircling lower skin 22 of the last press nip 18 of the press section 14 through the second press nip 54 guided.
  • a suction press roller can be provided as the central press roller 58 .
  • the first and the last press nip are formed by shoe press nips of a Duo-Zentri-NipcoFlex press comprising a central deflection-controlled roll are.
  • the linear forces of the relevant press nips can be variably adjusted across the width.
  • the fibrous web is taken over by a forming fabric 66 of the fabric section 12 by the upper press felt 56 wrapping around the central press roll 58 .
  • the fibrous web is taken over by a circulating dryer fabric 68 of a dryer group 70 from the second dryer fabric 34 .
  • the drying group 70 is, for example, a single-row drying group with overhead drying cylinders 72 and underlying deflection suction rolls 74, around which the drying wire 68 is guided.
  • a high-pressure spray pipe 76, a so-called DuoCleaner 78 with a rotating cleaning head or a cleaning boot, and a scraper 80 can be assigned to this lower skin, as shown. If 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. After that, the cleaning boot is moved and moved on across its working width to the lower covering 22 .
  • the DuoCleaner equipped with a cleaning boot, continues to move back at increased speed to the opposite side of the machine, where it is freed of adhering dirt particles by a cleaning station.
  • the cycle either starts again immediately afterwards or after a specified waiting time.
  • the bottom of the machine 10 is denoted by 82 and the basement or the zero level is denoted by 84 .
  • FIG. 2 shows a further exemplary embodiment of a machine 10 for laying or treating a fibrous web, which in particular can also be a paper or cardboard web or packaging paper web.
  • This embodiment differs from the embodiment shown in FIG last press nip 18 is arranged in such a way that the felt 19, together with the lower skin 22, forms a second sandwich region for guiding the fibrous web.
  • This variant also contributes to a stable web run.
  • an evacuated support roller 31.1 can be arranged in the area of the second sandwich area. This enables the fibrous web to run along safely with the lower covering 19.2, 22.
  • the last press nip of the press section can also be part of a DuoZentriNipcoFlex press described above or a tandem NipcoFlex press.

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Abstract

L'invention concerne une machine pour fabriquer ou traiter une nappe fibreuse, en particulier une nappe de papier ou de carton, comprenant une section de fil, une section de pressage et une section de séchage. Ici, la nappe fibreuse est placée au-dessus de la dernière ligne de contact de la section de pressage au moyen d'une première toile de séchage 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 de séchage de la section de séchage, la nappe fibreuse est guidée de manière généralement verticale vers le haut le long d'une section de séchage par impact, le long de laquelle le côté inférieur de la nappe fibreuse est séchée au moyen d'au moins un séchoir à impact.
PCT/EP2022/061900 2021-06-10 2022-05-04 Machine de fabrication ou de traitement de nappe fibreuse WO2022258262A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22727293.7A EP4352297A1 (fr) 2021-06-10 2022-05-04 Machine de fabrication ou de traitement de nappe fibreuse

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021114930.4 2021-06-10
DE102021114930.4A DE102021114930B3 (de) 2021-06-10 2021-06-10 Maschine zur herstellung oder behandlung einer faserstoffbahn

Publications (1)

Publication Number Publication Date
WO2022258262A1 true WO2022258262A1 (fr) 2022-12-15

Family

ID=81927427

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2022/061900 WO2022258262A1 (fr) 2021-06-10 2022-05-04 Machine de fabrication ou de traitement de nappe fibreuse

Country Status (3)

Country Link
EP (1) EP4352297A1 (fr)
DE (1) DE102021114930B3 (fr)
WO (1) WO2022258262A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102023101610A1 (de) 2023-01-24 2024-06-13 Voith Patent Gmbh Maschine und Verfahren zur Herstellung oder Behandlung einer Faserstoffbahn
DE102023101607A1 (de) 2023-01-24 2024-03-07 Voith Patent Gmbh Maschine zur Herstellung oder Behandlung einer Faserstoffbahn

Citations (2)

* 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
DE102007038133A1 (de) * 2007-08-13 2009-02-19 Voith Patent Gmbh Vorrichtung zur Herstellung einer Faserstoffbahn, insbesondere Papier-, Karton- oder Tissuebahn

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006040508A1 (de) 2006-08-30 2008-03-13 Voith Patent Gmbh Trocknungsanordnung
DE102020111746A1 (de) 2020-04-30 2021-11-04 Voith Patent Gmbh Maschine zur herstellung oder behandlung einer faserstoffbahn

Patent Citations (2)

* 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
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
DE102021114930B3 (de) 2022-10-13
EP4352297A1 (fr) 2024-04-17

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