EP4680802A1 - Procédé et dispositif de fabrication de bande fibreuse - Google Patents

Procédé et dispositif de fabrication de bande fibreuse

Info

Publication number
EP4680802A1
EP4680802A1 EP24711840.9A EP24711840A EP4680802A1 EP 4680802 A1 EP4680802 A1 EP 4680802A1 EP 24711840 A EP24711840 A EP 24711840A EP 4680802 A1 EP4680802 A1 EP 4680802A1
Authority
EP
European Patent Office
Prior art keywords
fiber
fibers
areas
reject
fiber web
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.)
Pending
Application number
EP24711840.9A
Other languages
German (de)
English (en)
Inventor
Dennis Latendorf
Frederic Noelle
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.)
Andritz Kuesters GmbH
Original Assignee
Andritz Kuesters 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 Andritz Kuesters GmbH filed Critical Andritz Kuesters GmbH
Publication of EP4680802A1 publication Critical patent/EP4680802A1/fr
Pending legal-status Critical Current

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
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/06—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods
    • D21B1/08—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods the raw material being waste paper; the raw material being rags
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/32—Defibrating by other means of waste paper

Definitions

  • the present invention relates to a method and a device for producing a fiber web, wherein a first fiber layer made of long fibers and a second fiber layer made of short fibers are provided and the first fiber layer and the second fiber layer are connected to one another.
  • the publication EP 4 087 967 A1 discloses a method for producing a fiber web in which a fiber layer made of carded long fibers, a so-called C layer, and a fiber layer made of wet-laid cellulose short fibers, a so-called P layer, are combined to form a fiber web.
  • Fiber webs that have both carded fibers and fibers laid as fiber pulp are called CP material.
  • CP stands for "carded pulp.”
  • CP materials combine the properties of carded fibers and fibers laid as pulp and are therefore often used to produce wipes, for example, due to their wet strength, absorbency and low price.
  • the edge areas are particularly problematic when producing CP materials. Neither the card nor the headbox used to lay the P layer can be adjusted so precisely that the desired quality properties are maintained right up to the edge of the fiber web. Therefore, the edge areas typically separated as reject areas.
  • the separated material consists of both short fibers and long fibers, which has so far prevented recycling of the separated material. Although short fibers can be added back to the pulp and long fibers can be carded again, the composite of short fibers and long fibers proves to be problematic both in the pulper and in the card. Long fibers disrupt the stock preparation process for forming the P layer because they cannot be separated as desired in the pulper and tend to spin during wet laying. Short fibers are too short to be processed in the card and bring dust and dirt into the card, which can potentially damage the card.
  • a first fiber layer made of long fibers and a second fiber layer made of short fibers are provided, wherein the first fiber layer and the second fiber layer are connected to one another.
  • the long fibers are artificially produced fibers.
  • the long fibers have a fiber length between 8 mm and 150 mm, preferably between 15 mm and 60 mm, particularly preferably between 25 mm and 50 mm and in particular between 35 mm and 45 mm.
  • the long fibers can also be continuous filaments, as in the case of spunbond-type threads.
  • the short fibers comprise natural fibers.
  • the short fibers can comprise cellulose fibers.
  • the short fibers comprise recycled fibers, such as waste paper, artificially produced fibers or mixtures thereof.
  • the short fibers have a fiber length of between 0.2 mm and 10 mm, preferably between 1 mm and 8 mm and in particular between 1.6 mm and 5 mm.
  • the cellulose fibers can be, for example, softwood pulp fibers.
  • the reject areas are separated from the first and second fiber layers.
  • the reject areas are separated from the first and second fiber layers separated after the first fiber layer has been connected to the second fiber layer.
  • the reject areas can be, for example, edge areas.
  • the edge areas are, for example, 30 mm to 50 mm wide.
  • reject areas include areas of the fiber web that cannot be assigned to any or not only to one or both edge areas, but for example include areas that were produced at the beginning of the production of the fiber web or at the end of the production of the fiber web.
  • the fibers of the separated reject areas are first dry-shredded in a shredding step.
  • the long fibers are shortened so that the length distribution of the long fibers corresponds approximately to the length distribution of the short fibers.
  • the dry-shredded reject areas are then dispersed in a pulper in a dissolving step and the fibers of the reject areas are separated in the process.
  • the shredded and dispersed reject areas are then used as recycling material to produce the fiber web or another fiber web by wet-laying the fibers of the shredded and dispersed reject areas.
  • reject areas only go through the shredding and dissolving steps if the proportion of reject areas in the fiber layers is greater than a minimum proportion. This ensures that the process is operated profitably, i.e. that recycling only takes place if reject areas are generated on a scale that makes it worthwhile to recycle.
  • the two-stage recycling process adjusts the fiber lengths of the long fibers to the fiber lengths of the short fibers, so that the material separated with the reject areas can be further used to produce the fiber web or another fiber web.
  • the shredding step the length of the fibers of the separated reject areas is first defined. This makes it possible for the long fibers to be shortened to such an extent that the fibers have an acceptable fiber length distribution after passing through the shredding step. In particular, it is possible for the long fibers to be shortened to such an extent that they can be wet-laid with a P-layer without spinning occurring.
  • the reject areas are dispersed in a pulper and the fibers of the reject areas are separated.
  • the first fiber layer and the second fiber layer are joined together by hydroentanglement.
  • the hydroentanglement fiber layers are dried using a dryer, such as a through-air dryer, before the reject areas are separated.
  • a dryer such as a through-air dryer
  • reject areas are separated between the hydroentanglement and the dryer.
  • the fibre web is wound up.
  • the shredding step is preceded by a pre-shredding step.
  • the reject areas are dry-shredded.
  • foreign matter such as cardboard tubes or adhesive tape is removed.
  • the pre-shredding step is carried out using a guillotine and/or a knife system and/or a shredder, for example a shaft shredder.
  • the degree of pre-shredding i.e. the maximum fiber length after passing through the pre-shredding, is set by adjusting a perforated aperture of a pre-shredding unit.
  • the perforated aperture is set to 10 mm to 30 mm and preferably to around 20 mm.
  • the fibers of the reject areas are defibrated and dry-comminuted in the comminution step. In addition to shortening the long fibers, this also advantageously makes it possible for the recycled fibers to be better bonded to one another and to other fibers during further processing, in particular with hydroentanglement.
  • the comminution step is carried out in a cutting mill. This advantageously makes it possible for the defibration and shortening of the fibers to be carried out in one machine. However, it is also conceivable that the shortening and defibration take place as separate steps.
  • the fiber length of the fibers after the comminution step can be selected by adjusting the knife set and the apertures of the cutting mill.
  • an aperture size of 0.5 mm to 10 mm is conceivable, preferably from 1 mm to 8 mm and particularly preferably from 3 mm to 6 mm.
  • the fibers are hydrodynamically separated in the dissolving step.
  • the dry-shredded reject areas are mixed with water and the resulting suspension is set in motion.
  • Dispersing in the pulper is preferably carried out as in the production of cellulose pulp. It is conceivable that the suspension in the dissolving step has a fiber density of 1% to 10% and preferably of about 5%. It is conceivable that the dissolving step is carried out at a temperature of about 30 °C to 50 °C and in particular of about 40 °C. It is preferably provided that the hydrodynamic separation is carried out for 10 minutes to 30 minutes and in particular 20 minutes.
  • the reject areas go through a coarse sorting step after the pulping step.
  • the coarse sorting step is carried out with a hole sorting basket.
  • the hole sorting basket can be integrated into the pulper. It is conceivable that the coarse sorting step is carried out with a fiber density of the suspension of 1% to 8% and preferably 3.5%. It is also conceivable that the hole diameter of the hole sorting basket is between 4 mm and 10 mm and in particular 6 mm.
  • the reject areas undergo a sorting step after the dissolving step and preferably after the coarse sorting step.
  • spuns in the reject areas are sorted out.
  • Spuns so-called nits, arise in the dry shredding of the fibers in the reject areas.
  • a pulper is unable to completely dissolve the spuns. If the spuns get into the fiber web via the recycling material, they lead to a significant reduction in quality. This is avoided by sorting out the spuns in the sorting step.
  • the sorting step is carried out with a barrier screen basket. Slotted or perforated screen baskets can be used for this.
  • the sorting step is carried out with a vibrating shaker, inclined screens introduced into falling streams or cleaners/cone centrifuges. Due to the higher density and the hydrodynamically more favorable shape of the spinnings, these can also be separated by sedimentation in the gravitational field. It is conceivable that a combination of the machines or methods mentioned above is used in the sorting step. It is conceivable that the fiber density of the suspension for sorting out the spinnings is set to 1% to 5% and preferably to 2.1% to 3.5%.
  • the spuns are dispersed and then returned to the recycling material.
  • the spuns are mechanically destroyed. This can be done, for example, with a refiner, such as a flat, drum or cone refiner, a Dutch or other grinding unit or a deflaker or disperser. It is important to ensure that the mechanical destruction of the spuns results in as little unwanted shortening of the fiber lengths as possible, so that a high proportion of fines is not created. It is conceivable that the spuns are only dispersed and then returned to the recycling material if the proportion of the spuns in the reject areas and/or the proportion of spinning in the fiber layers is greater than a further minimum proportion. This ensures that the process is operated even more profitably, i.e. that all material is only really recycled if it is economically viable to do so.
  • the first fiber layer is a carded fiber layer.
  • the first fiber layer has artificially produced fibers.
  • the second fiber layer is wet-laid from a fiber pulp. It is conceivable that the second fiber layer is laid on the first fiber layer, i.e. that the fiber web is a CP material. However, it is also conceivable that the first fiber layer is laid on the second fiber layer, i.e. that the fiber web is a PC material. It is also conceivable that the fiber web has several fiber layers with long fibers, in particular several carded fiber layers.
  • the fiber web has several fiber layers with short fibers, in particular several fiber layers which are wet-laid from a fiber pulp. It is therefore conceivable, for example, that the fiber web is or has a CPC material, a PCP material, a CPCP material, a PCPC material, a CCP material, a PPC material, a CPP material, a PCC material, etc.
  • the recycled material is used to produce the fiber web and that the shredding step and the dissolving step are carried out inline.
  • the recycled material is also fed inline, in particular without storing the recycled material, to provide the second fiber web.
  • the coarse sorting step and/or the absorption step and/or the pre-shredding are carried out inline.
  • a recycling line for recycling the separated reject areas is arranged along a production line for producing the fiber web.
  • the production line preferably has the card, the headbox, the hydroentanglement and the dryer.
  • the recycling line preferably has the cutting mill and the pulper.
  • a further object for solving the problem set out above is a device for producing a fiber web according to the invention.
  • the device has a shredding unit for dry shredding of the separated Reject areas, preferably a cutting mill.
  • the device also has a pulper, which is provided for dispersing the dry-shredded reject areas.
  • the device has the production line and the recycling line.
  • Fig. 1 a schematic view of a device according to an exemplary embodiment of the present invention for carrying out a method according to an exemplary embodiment of the present invention
  • Fig. 2 a schematic view of a device according to another exemplary embodiment of the present invention for carrying out a method according to another exemplary embodiment of the present invention
  • FIG. 3 a schematic view of a device according to another exemplary embodiment of the present invention for carrying out a method according to another exemplary embodiment of the present invention.
  • Figures 1, 2 and 3 each show devices 100 according to exemplary embodiments of the present invention for carrying out methods according to exemplary embodiments of the present invention.
  • Figure 1 shows a device 100 for producing a fiber web 3.
  • Fiber material consisting of long fibers is transported from a bale opener 10 to a card 11.
  • the long fibers are carded into a first fiber layer 1 by means of the card 11.
  • the long fibers are artificially produced fibers with a fiber length of approximately 38 mm.
  • the first fiber layer 1 is pre-consolidated in a pre-consolidation 12.
  • the pre-consolidation 12 can, for example, consolidate with water jets and preferably on a screen belt. Hydrodynamic needling or swirling can be used for this purpose, which is known to those skilled in the art as water jet entanglement.
  • a second fiber layer 2 is placed on the carded first fiber layer 1 using a headbox 20. This is done here using a wet-laying process.
  • the second fiber layer 2 has short fibers and is provided as fiber pulp.
  • the short fibers are dispersed in a further pulper 15 to form an aqueous suspension and, if necessary, temporarily stored in a vat 16.
  • a sorter 17 separates components from the aqueous suspension which, for example due to their size, are unsuitable for further feeding into the production process. These separated components are removed from the production process as waste 23.
  • the suspension cleaned in this way is, if necessary, temporarily stored in a further vat 18 and then fed to the headbox 20.
  • the short fibers of the second fiber layer 2 have a fiber length of approx. 2 mm.
  • the first fiber layer 1 and the second fiber layer 2 undergo a water jet consolidation 13.
  • the fibers of the first fiber layer 1 and the second fiber layer 2 are entangled with one another.
  • water is simultaneously removed from the second fiber layer 2, in particular the excess water is filtered off through the first fiber layer 1.
  • the first fiber layer 1 and the second fiber layer 2 can be consolidated on a sieve belt water jet, whereby are arranged below the screen belt of the suction box to suck out the excess water.
  • the hydroentanglement can also take place when the first fiber layer 1 or the second fiber layer 2 is lying on a drum.
  • hydroentanglement takes place first, in which the first fiber layer 1 and/or the second fiber layer 2 are lying on a screen belt, and then a further hydroentanglement is carried out, in which the first fiber layer 1 and/or the second fiber layer 2 are lying on a drum.
  • the now connected fiber layers 1, 2 are then dried in a dryer 14.
  • reject areas 5 are separated from the fiber web 3 in a separation unit 19.
  • the separated reject areas 5 are used to remove valuable material from the production process of the fiber web 3.
  • the separated reject areas 5 go through a recycling process.
  • the separated reject areas 5 are fed to a pre-shredding unit 21.
  • the separated reject areas 5 are dry-shredded. This can be done, for example, with a guillotine, a knife system or a shredder. It is conceivable that the fibers of the separated reject areas 5 are shortened to a maximum length of approx.
  • the reject areas 5 are then dry-shredded and simultaneously defibrated in a shredding step with a cutting mill 6.
  • the knife set and the outlet openings of the cutting mill 6 determine the maximum fiber length of the shredded and defibrated fibers of the reject areas 5.
  • the shredded and defibrated fibers of the reject areas 5 are transported to a pulper 7.
  • the pulper 7 the shredded and defibrated fibers are mixed with water to form an aqueous suspension and separated hydrodynamically.
  • the fiber density of the aqueous suspension is 5%.
  • Typical parameters for running through this dissolving step in the pulper 7 are a temperature of 40 °C and a dissolving time in the pulper 7 of 20 minutes.
  • the suspension is subjected to a rough sorting in the pulper 7.
  • a hole sorting basket 7.1 is provided in the pulper 7.
  • the rough sorting can also be carried out outside the pulper 7.
  • the fiber density of the aqueous suspension is reduced to about 3.5%. With a typical hole diameter of the hole sorting basket 7.1 of 6 mm, non-dispersed fragments can be removed from the suspension.
  • the aqueous suspension is led to a barrier screen basket 8, in which spun particles are removed from the aqueous suspension in an absorption step.
  • the barrier screen basket 8 is provided here as a slotted sorting basket with a slot width of 0.2 mm.
  • Alternative systems for coarse sorting include, for example, vibrating shakers, setting inclined screens in falling streams of the suspension or cone centrifuges.
  • the fiber density of the aqueous suspension is preferably reduced further, for example to 2.1%.
  • the absorbed spun particles are fed as reject to a refiner 9, in which the spun particles are mechanically destroyed. After the spun particles have been destroyed, the absorbed fibers can be recycled again.
  • the reject areas 5 treated in this way can be fed directly to the production process of the fiber web 3 as recycling material 24 by being taken to the further pulper 15 to provide the second fiber layer 2.
  • the recycling process of the reject areas 5 therefore preferably takes place inline.
  • the recycling process of the reject areas 5 does not take place inline, but that the processed reject areas, after going through the sorting step and destroying the spinning, are first stored in a warehouse 22 as recycling material 24.
  • the fibers of the reject areas 5 stored in this way can then, for example, be fed to another production process, for example to produce another fiber web 4.
  • Such an embodiment is shown in Figure 2.
  • the method and device according to the invention are not limited to two-layer fiber webs 3.
  • the method according to the invention not only relates to the production of CP or PC materials, but also, for example, any combination of different fiber layers with long and short fibers.
  • Figure 3 shows, for example, a device 100 and a method according to an exemplary embodiment for producing a fiber web 3, which has a carded first fiber layer 1 with long fibers, a second fiber layer 2 with short fibers and a carded further first fiber layer 1' with long fibers.
  • a CPC material is produced here.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un procédé de fabrication de bande fibreuse (3), une première couche de fibres (1) de fibres longues et une seconde couche fibreuse (2) de fibres courtes étant prévues, les première et seconde couches fibreuses (1, 2) étant reliées l'une à l'autre, des régions d'exclusion (5) étant séparées des première et seconde couches fibreuses (1, 2) après leur liaison, les fibres longues de la couche d'exclusion séparée (5) étant d'abord raccourcies par séchage et correspondant ainsi approximativement à la distribution des longueurs des fibres courtes, les régions d'exclusion broyées à sec étant ensuite dispersées dans un désintégrateur (7) et les fibres des régions d'exclusion (5) étant séparées, les régions d'exclusion broyées et dispersées (5) étant utilisées comme matériau de recyclage pour produire la bande fibreuse (3) ou une autre bande fibreuse (4) par mise en couches à l'état humide des fibres des régions d'exclusion broyées et dispersées (5). L'invention concerne également un dispositif pour la mise en œuvre du procédé.
EP24711840.9A 2023-03-13 2024-03-12 Procédé et dispositif de fabrication de bande fibreuse Pending EP4680802A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102023106230.1A DE102023106230A1 (de) 2023-03-13 2023-03-13 Verfahren und Vorrichtung zum Herstellen einer Faserbahn
PCT/EP2024/056499 WO2024189001A1 (fr) 2023-03-13 2024-03-12 Procédé et dispositif de fabrication de bande fibreuse

Publications (1)

Publication Number Publication Date
EP4680802A1 true EP4680802A1 (fr) 2026-01-21

Family

ID=90365379

Family Applications (1)

Application Number Title Priority Date Filing Date
EP24711840.9A Pending EP4680802A1 (fr) 2023-03-13 2024-03-12 Procédé et dispositif de fabrication de bande fibreuse

Country Status (4)

Country Link
EP (1) EP4680802A1 (fr)
CN (1) CN120981628A (fr)
DE (1) DE102023106230A1 (fr)
WO (1) WO2024189001A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1246382B (de) * 1961-03-30 1967-08-03 Battelle Institut E V Verfahren zum Aufschluss von Altpapier
DE3424919A1 (de) * 1984-07-06 1986-01-16 J.M. Voith Gmbh, 7920 Heidenheim Verfahren zur altpapieraufbereitung
SE512030C2 (sv) * 1998-05-14 2000-01-17 Lars Ekstroem Sätt och anordning för delning av pappersbana jämte pappersmaskin med sådan anordning
DE10135700A1 (de) * 2001-07-21 2003-02-06 Voith Paper Patent Gmbh Verfahren zur Aufbereitung von Trockenausschuss
DE102011120630A1 (de) * 2011-12-09 2013-06-13 Aerocycle Gmbh Verfahren zur Altpapieraufbereitung
DE102015223333B4 (de) * 2014-11-25 2018-06-28 Technische Universität Dresden Verfahren und Anlage zur Aufbereitung hochfester Papierprodukte
FI20185942A1 (fi) * 2018-11-06 2020-05-07 Valmet Technologies Oy Seulalevy, pulpperi, prosessi ja menetelmä kuitumassasuspension valmistamiseksi
DE102020100472A1 (de) 2020-01-10 2021-07-15 Andritz Küsters Gmbh Verfahren zur Herstellung einer Verbundvlieswarenbahn und Vorrichtung zur Herstellung einer Verbundvlieswarenbahn

Also Published As

Publication number Publication date
WO2024189001A1 (fr) 2024-09-19
CN120981628A (zh) 2025-11-18
DE102023106230A1 (de) 2024-09-19

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