EP2821547B1 - Method and apparatus for producing a multilayer fibrous web, and multilayer fibrous web produced according to the method - Google Patents

Method and apparatus for producing a multilayer fibrous web, and multilayer fibrous web produced according to the method Download PDF

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Publication number
EP2821547B1
EP2821547B1 EP13175143.0A EP13175143A EP2821547B1 EP 2821547 B1 EP2821547 B1 EP 2821547B1 EP 13175143 A EP13175143 A EP 13175143A EP 2821547 B1 EP2821547 B1 EP 2821547B1
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EP
European Patent Office
Prior art keywords
fibrous
material layer
layer
permeable
conveyor belt
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EP13175143.0A
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German (de)
French (fr)
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EP2821547A1 (en
Inventor
Günter HALMSCHLAGER
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Mayr Melnhof Karton AG
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Mayr Melnhof Karton AG
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Publication date
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Priority to SI201331053T priority Critical patent/SI2821547T1/en
Priority to PL13175143T priority patent/PL2821547T3/en
Priority to ES13175143.0T priority patent/ES2671938T3/en
Priority to TR2018/07985T priority patent/TR201807985T4/en
Priority to HUE13175143A priority patent/HUE037818T2/en
Priority to EP13175143.0A priority patent/EP2821547B1/en
Publication of EP2821547A1 publication Critical patent/EP2821547A1/en
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Publication of EP2821547B1 publication Critical patent/EP2821547B1/en
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • 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
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
    • D21F9/006—Complete machines for making continuous webs of paper of the twin-wire type paper or board consisting of two or more layers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/32—Multi-ply with materials applied between the sheets
    • D21H27/34—Continuous materials, e.g. filaments, sheets, nets
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H1/00—Paper; Cardboard
    • D21H1/02—Multi-ply material finished plies
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/18—Paper- or board-based structures for surface covering

Definitions

  • the invention relates to a method for producing a multilayer fibrous web, in particular a paper or board web, comprising at least a first and a second fibrous layer.
  • the invention further relates to an apparatus for producing a multilayer fibrous web, in particular a paper or board web, comprising at least a first and a second fibrous layer.
  • Methods and apparatus for producing a multilayer fibrous web, in particular of paper or board webs are known from the prior art in various embodiments, for example from EP 1 422 340 A1 , known.
  • several layers of partially different fibrous materials are formed separately, in particular in paperboard production, and then pressed or vergautscht gradually.
  • a disadvantage of the known methods and devices is that in conventional layer or sheet formation, the fiber orientation is primarily oriented in the x / y direction (two-dimensional) and only very slightly in the z-direction, ie in height. As a result, however, no or only low strength of the multilayer fibrous webs formed in the z-direction can be achieved.
  • the multilayer paper or board webs produced by the known methods and devices always have a high density at a relatively low volume.
  • Object of the present invention is to provide a method and an apparatus for producing a multi-layer fibrous web, in particular a paper or Paperboard web, which allows the cost-effective production of a multilayer fibrous web with improved strength in the z-direction and with an increased volume while reducing the density.
  • a method for producing a multilayer fibrous web comprises at least the following steps: applying a first fibrous suspension to a first permeable or non-permeable conveyor belt to form a first fibrous web layer; Fiberizing and / or singulating the first pulp layer at a moisture content of between 95 and 40% by weight to individual fibers and / or fiber groups; Forming a porous pulp layer by means of the individual fibers and / or fiber groups of the first pulp layer and Vergautschen the porous pulp layer with the second pulp layer to form the multilayer fibrous web.
  • the fibers and / or fiber groups thus isolated can form a very loose and porous fibrous material layer.
  • Such a fibrous layer with a highly porous structure can not be formed in the usual and known wet Faserstofflagen- or sheet formation.
  • a porous fibrous material layer is formed in which the fibers and / or fiber groups are reoriented, so that a strong orientation component of the fibers in the z direction is also provided.
  • the first pulp suspension has a moisture content between 99.9 and 96.0 wt .-% in a corresponding, the first conveyor belt associated headbox.
  • the second fibrous layer is produced by applying a second fibrous suspension having a moisture content in a further, the second conveyor belt associated headbox between 99.8 and 96.0 wt .-% to a second permeable or non-permeable conveyor belt. Said moisture content has proven to be particularly advantageous for the production of the first and second pulp layer.
  • the pulp suspension contains pulps based on cellulose. In particular, these may be mechanically or chemically disrupted pulps, in particular wood pulps and / or pulps. Furthermore, the pulp suspensions recycled fibers from waste paper or old cardboard can be added. Also, a certain proportion of artificial, in particular plastic fibers and / or mineral fibers may optionally be added to the pulp suspensions.
  • the individual fibers and / or fiber groups of the shredded and singulated first fiber layer are applied to a third permeable or non-permeable conveyor belt for forming the porous fibrous layer prior to covering with the at least one further fiber layer.
  • the porous pulp layer can be formed as a single layer or as a single sheet.
  • the individual fibers and / or fiber groups of the fiberized and singulated first fiber layer can be applied directly to the latter for forming the porous fibrous material layer before being covered with the second fiber material layer.
  • the method comprises a further step of applying at least one further, third pulp suspension having a moisture content in another headbox between 99.8 and 96.0% by weight to at least one further permeable or non-permeable conveyor belt to form a further, third fiber layer and the Vergautschen the third fiber layer with the porous fibrous layer and / or the second fibrous layer comprises.
  • the method according to the invention can be varied.
  • the porous pulp layer can be applied directly to a conventionally formed pulp layer.
  • the porous fiber layer is formed completely separate from the other pulp layers as a single layer. This advantageously results in a multiplicity of possible uses for the porous fibrous material layer produced according to the invention.
  • the second fibrous layer or the third fibrous layer is formed as a top or backsheet of the multi-layer fibrous web.
  • a multilayer fibrous web produced by the method according to the invention is characterized inter alia by the fact that the formation of the porous fibrous material layer results in a good and uniform bedding of the cover layer. In comparison, for example, the bedding of the cover layer on a shaft in a corrugated board is relatively poor and uneven.
  • the speed of the second permeable or non-permeable conveyor belt or the third permeable or non-permeable conveyor belt is equal to or not equal to the speed of the first permeable or non-permeable conveyor belt.
  • the aforementioned conveyor belts may be at least partially formed as felts or screens.
  • additives such as binders, retention aids, fillers, dyes, bleach, wet strength and / or other additives used in paper and board making used adjuvants
  • Suitable fillers are usually minerals, such as kaolin, talc or calcium carbonate.
  • starch can be added to the fiber layers or to the resulting fiber web by means of a size press or a starch bath.
  • polyethylene pulp may be added to the pulp suspensions, for example.
  • biopolymers for example hemicellulose, cellulose, lignin and / or polyoses, and / or polysaccharides, for example starch, starch polymers, alginates, chitins, hemicellulose, cellulose derivatives, cellulose esters, cellulose acetate, cellulose triacetate, cellulose nitrate, cellulose ethers, ethylcellulose, methylcellulose, Oxyethylcellulose, oxypropylcellulose and carboxymethylcellulose are used.
  • resins such as phenol-formaldehyde resins, melamine-formaldehyde resins, mixtures of phenol-formaldehyde resins and melamine-formaldehyde resins, neutral or anionic polymers, polyvinyl alcohol, polyacrylamide, anionic or cationic polyelectrolytes such as acrylic acid, carboxymethylcellulose, anionic or cationic starch, polydiallyldiamonium chloride (PolyDADMAC)) or polyvinylamine, natural dry strength agents such as galactomannan or alginates, synthetic dry strength agents such as polyamines, polyamides, polyalcohols, polyacrylamides, polyvinyl alcohol, polyvinyl (alcohol acetate), polyimines or polyethylenimine (PEI), crosslinking or physical wet strength agents such as glyoxal, glutardialdehyde (1,5-pentanedialdehyde) , Aldehy
  • additives from the groups, fixatives, aluminum salts, flame retardants, defoamers, deaerators, lignin derivatives, lignosulfonates, biocides and / or fungicides may also be used.
  • the additives can in principle be added one or more times at the same point and / or at different points in the production process.
  • the invention further relates to a device for producing a multilayer fibrous web, in particular a paper or board web, comprising at least a first and a second fibrous layer, wherein the device at least one Zerfaserungsvorraum for defibering and / or for separating the first fibrous layer to individual fibers and / or Having fiber groups at a moisture content between 95 and 40 wt .-%.
  • a device for producing a multilayer fibrous web in particular a paper or board web, comprising at least a first and a second fibrous layer
  • the device at least one Zerfaserungsvorraum for defibering and / or for separating the first fibrous layer to individual fibers and / or Having fiber groups at a moisture content between 95 and 40 wt .-%.
  • a multi-layer fibrous web can advantageously be produced by the device according to the invention, which on the one hand is inexpensive to produce and has improved strength in the z-direction (perpendicular to the fiber web level). Furthermore, the multilayer fibrous web produced with the device according to the invention has an increased volume with a simultaneous reduction in the density. Finally, a high rigidity and good thermal insulation properties of the multilayer fibrous web thus produced can be observed.
  • the first pulp layer is formed by applying a first pulp suspension having a moisture content in a headbox between 99.9 and 96.0 wt .-% to a first permeable or non-permeable conveyor belt.
  • the fiberizing device is comb-shaped, brush-shaped or roller-like.
  • Other refinements of the fiberizing device are also conceivable, and these must enable defibration and / or singling of the first fibrous layer to form individual fibers and / or fiber groups.
  • a second permeable or non-permeable conveyor belt for receiving the shredded and / or separated fibers and / or fiber groups of the first fiber layer can be arranged.
  • a second pulp layer can already be applied by applying a second pulp suspension having a moisture content in a correspondingly assigned headbox between 99.8 and 96.0 wt .-% on the second conveyor belt.
  • the separated fibers and / or fiber groups of the first fiber layer are then applied directly to the second fiber layer and form a porous fibrous layer.
  • the separated fibers and / or fiber groups are applied directly to the second conveyor belt to form the porous fibrous layer.
  • the speed of the second conveyor belt and / or another permeable or non-permeable conveyor belt is equal to or not equal to the speed of the first conveyor belt. This advantageously allows the properties such as density and volume of the porous fibrous material layer to be adjusted and controlled.
  • the device comprises at least one pressing device for covering at least the second fibrous layer with a porous fibrous layer formed from the defibred and / or separated fibers and / or fiber groups and / or at least one drying device for drying the multilayer fibrous web and / or or at least one calender and / or at least one glueing and / or gluing device and / or at least one picking device for picking up the fibrous web from the corresponding conveyor belt and / or at least one application device for additives and / or at least one cutting device.
  • the device according to the invention may comprise one or more of said machine elements.
  • the present invention also includes a multi-ply fibrous web made by a method as described and / or made by means of a device also described above.
  • Fig. 1 shows a schematic representation of an apparatus 20 for producing a multilayer fibrous web 10, in particular a paper or board web.
  • the apparatus 20 comprises a first headbox 38, via which a first pulp suspension 16 is applied to a first permeable or non-permeable conveyor belt 18.
  • the pulp suspension 16 comprises pulps based on cellulose.
  • the pulp suspension 16 may consist of a mixture of virgin fibers and recycled fibers from waste paper or old cardboard.
  • the pulp suspension 16 has a moisture content in the headbox 38 between 99.9 and 96.0 wt .-%.
  • On the first conveyor belt 18 then formed from the first pulp suspension 16, a first pulp layer 12 from.
  • a fiberizing device 48 is arranged at the end region of the first conveyor belt 18 in the region of a transport and deflection roller 26, .
  • the shredding device 48 is used for shredding and / or for separating the first pulp layer 12 into individual fibers and / or fiber groups 28.
  • the first fiber layer 12 has a moisture content of between 95 and 40% by weight.
  • the fiberizing device 48 is formed like a brush.
  • the shredded and separated fibers and / or fiber groups 28 of the first pulp layer 12 are applied or spin-coated onto a second pulp layer 14.
  • the second fibrous material layer 14 has been produced by applying a second fiber suspension 22 via a second headbox 40 to a second permeable or non-permeable conveyor belt 24.
  • the second pulp suspension 22 has a moisture content in the headbox 40 between 99.8 and 96.0 wt .-%.
  • the fibers and / or fiber groups 28 thus applied to the second fibrous material layer 14 form a porous fibrous material layer 36 over the second fibrous material layer 14.
  • This porous pulp layer 36 has in particular fibers and / or fiber groups which are in z-direction, i.
  • a third pulp layer 34 is applied to the porous pulp layer 36.
  • the third pulp layer 34 is formed via a third headbox 42, which applies a third pulp suspension 30 to another permeable or non-permeable conveyor belt 32.
  • the third pulp suspension 30 has a moisture content of between 99.8 and 96.0% by weight.
  • Both the second and third pulp suspension 30 contain cellulosic or other source pulps. These may be so-called virgin fibers and / or recycled fibers and / or artificially produced fibers.
  • the porous fibrous material layer 36 with the second fibrous layer serving as a backsheet and serving as the topsheet third pulp layer 34 by means of a pressing device 44 is vergautscht. After Vergautschen a drying of the multi-layer fibrous layer 10 and optionally the application of one or more strokes. Furthermore, the device 20 has a removal device 46 for removing the fibrous web 10 from the conveyor belt 24. After leaving the device 20, the multi-layer fibrous web 10 can be further processed.
  • Fig. 2 shows a schematic representation of an alternative, second embodiment of the device 20 for producing a multilayer fibrous web 10.
  • the arrangement of the brush-like fiberizing device 48 can be seen.
  • the fiberizing device 48 comprises a cylinder 52 on which corresponding bristles or prongs 54 are formed.
  • the shredding device 48 rotates in opposite directions to the transport and deflection roller 26 of the first conveyor belt 18. It can be seen how the first fiber layer 12 is defibrated and separated.
  • the resulting individual fibers and / or fiber groups 28 are applied directly to a permeable or non-permeable conveyor belt 50 in the illustrated embodiment.
  • the arrows marked T in the FIGS. 1 and 2 represent the transport directions of the conveyor belts 18, 24, 32, 50 represents.
  • the porous pulp layer 36 is formed.

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Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer mehrlagigen Faserstoffbahn, insbesondere einer Papier- oder Kartonbahn, umfassend mindestens eine erste und eine zweite Faserstofflage. Die Erfindung betrifft weiterhin eine Vorrichtung zur Herstellung einer mehrlagigen Faserstoffbahn, insbesondere einer Papier- oder Kartonbahn, umfassend mindestens eine erste und eine zweite Faserstofflage.The invention relates to a method for producing a multilayer fibrous web, in particular a paper or board web, comprising at least a first and a second fibrous layer. The invention further relates to an apparatus for producing a multilayer fibrous web, in particular a paper or board web, comprising at least a first and a second fibrous layer.

Verfahren und Vorrichtungen zur Herstellung einer mehrlagigen Faserstoffbahn, insbesondere von Papier- oder Kartonbahnen sind aus dem Stand der Technik in verschiedenen Ausgestaltungen, z.B. aus der EP 1 422 340 A1 , bekannt. Dabei werden insbesondere bei der Kartonherstellung mehrere Lagen teilweiser unterschiedlicher Faserstoffe getrennt gebildet und dann nach und nach verpresst bzw. vergautscht. Nachteilig an den bekannten Verfahren und Vorrichtungen ist jedoch, dass bei herkömmlicher Lagen- bzw. Blattbildung die Faserausrichtung primär in x/y-Richtung (zweidimensional) und nur sehr gering in der z-Richtung, d.h. in der Höhe orientiert ist. Dadurch kann aber keine oder nur eine geringe Festigkeit der gebildeten mehrlagigen Faserstoffbahnen in z-Richtung erzielt werden. Zudem weisen die mittels der bekannten Verfahren und Vorrichtungen hergestellten mehrlagigen Papier- oder Kartonbahnen immer eine hohe Dichte bei einem relativ geringen Volumen auf.Methods and apparatus for producing a multilayer fibrous web, in particular of paper or board webs are known from the prior art in various embodiments, for example from EP 1 422 340 A1 , known. In this case, several layers of partially different fibrous materials are formed separately, in particular in paperboard production, and then pressed or vergautscht gradually. A disadvantage of the known methods and devices, however, is that in conventional layer or sheet formation, the fiber orientation is primarily oriented in the x / y direction (two-dimensional) and only very slightly in the z-direction, ie in height. As a result, however, no or only low strength of the multilayer fibrous webs formed in the z-direction can be achieved. In addition, the multilayer paper or board webs produced by the known methods and devices always have a high density at a relatively low volume.

Aufgabe der vorliegenden Erfindung ist es, ein Verfahren und eine Vorrichtung zur Herstellung einer mehrlagigen Faserstoffbahn, insbesondere einer Papier- oder Kartonbahn, bereitzustellen, welche die kostengünstige Herstellung einer mehrlagigen Faserstoffbahn mit verbesserter Festigkeit in z-Richtung sowie mit einem erhöhten Volumen bei gleichzeitiger Verringerung der Dichte ermöglicht.Object of the present invention is to provide a method and an apparatus for producing a multi-layer fibrous web, in particular a paper or Paperboard web, which allows the cost-effective production of a multilayer fibrous web with improved strength in the z-direction and with an increased volume while reducing the density.

Die Aufgabe wird erfindungsgemäß durch ein Verfahren mit den Merkmalen des Anspruchs 1 sowie durch eine Vorrichtung mit den Merkmalen des Anspruchs 10 gelöst. Vorteilhafte Ausgestaltungen mit zweckmäßigen Weiterbildungen der Erfindung sind in den jeweiligen Unteransprüchen angegeben, wobei vorteilhafte Ausgestaltungen des Verfahrens als vorteilhafte Ausgestaltungen der Vorrichtung und umgekehrt anzusehen sind.The object is achieved by a method having the features of claim 1 and by a device having the features of claim 10. Advantageous embodiments with expedient developments of the invention are specified in the respective subclaims, wherein advantageous embodiments of the method are to be regarded as advantageous embodiments of the device and vice versa.

Ein erfindungsgemäßes Verfahren zur Herstellung einer mehrlagigen Faserstoffbahn, insbesondere einer Papier- oder Kartonbahn, umfassend mindestens eine erste und eine zweite Faserstofflage, umfasst zumindest folgende Schritte: Aufbringen einer ersten Faserstoffsuspension auf ein erstes permeables oder nicht-permeables Transportband zur Ausbildung einer ersten Faserstofflage; Zerfasern und/oder Vereinzelung der ersten Faserstofflage bei einem Feuchtigkeitsgehalt zwischen 95 und 40 Gew.-% zu einzelnen Fasern und/oder Fasergruppen; Ausbildung einer porösen Faserstoffschicht mittels der einzelnen Fasern und/oder Fasergruppen der ersten Faserstofflage und Vergautschen der porösen Faserstoffschicht mit der zweiten Faserstofflage unter Bildung der mehrlagigen Faserstoffbahn. Durch die Zerfaserung und/oder Vereinzelung der ersten Faserstofflage können die so vereinzelten Fasern und/oder Fasergruppen eine sehr lockere und poröse Faserstoffschicht ausbilden. Eine derartige Faserstoffschicht mit einem hochporösen Gefüge kann bei der üblichen und bekannten nassen Faserstofflagen- oder Blattbildung nicht ausgebildet werden. Durch das Zerfasern und/oder Vereinzeln der ersten Faserstofflage entsteht eine poröse Faserstoffschicht in der die Fasern und/oder Fasergruppen neu orientiert werden, sodass auch ein starker Ausrichtungsanteil der Fasern in z-Richtung gegeben ist. Dadurch wird eine hohe so genannte z-Festigkeit, d.h. eine Festigkeit die senkrecht zur Ebene der Faserstoffbahn ausgebildet ist, erzielt, die bei bekannten mehrlagigen Faserstoffbahnen nicht erreichbar ist. Zudem weist die poröse Faserstoffschicht ein hohes Volumen bei niedriger Dichte auf. Insgesamt ergibt sich durch das erfindungsgemäße Verfahren eine mehrlagige Faserstoffbahn mit einer hohen Steifigkeit und guten Wärmedämmeigenschaften.A method according to the invention for producing a multilayer fibrous web, in particular a paper or board web comprising at least a first and a second fibrous layer, comprises at least the following steps: applying a first fibrous suspension to a first permeable or non-permeable conveyor belt to form a first fibrous web layer; Fiberizing and / or singulating the first pulp layer at a moisture content of between 95 and 40% by weight to individual fibers and / or fiber groups; Forming a porous pulp layer by means of the individual fibers and / or fiber groups of the first pulp layer and Vergautschen the porous pulp layer with the second pulp layer to form the multilayer fibrous web. As a result of the defibration and / or singling of the first fibrous layer, the fibers and / or fiber groups thus isolated can form a very loose and porous fibrous material layer. Such a fibrous layer with a highly porous structure can not be formed in the usual and known wet Faserstofflagen- or sheet formation. By fibrillating and / or singulating the first fibrous layer, a porous fibrous material layer is formed in which the fibers and / or fiber groups are reoriented, so that a strong orientation component of the fibers in the z direction is also provided. As a result, a high so-called z-strength, ie a strength which is formed perpendicular to the plane of the fibrous web, achieved, which is not attainable in known multilayer fibrous webs. In addition, the porous pulp layer has a high volume at low density. Overall, results from the Method according to the invention a multilayer fibrous web with a high rigidity and good thermal insulation properties.

In einer weiteren vorteilhaften Ausgestaltung des erfindungsgemäßen Verfahrens weist die erste Faserstoffsuspension einen Feuchtigkeitsgehalt zwischen 99,9 und 96,0 Gew.-% in einem entsprechenden, dem ersten Transportband zugeordneten Stoffauflauf auf. Zudem wird die zweite Faserstofflage durch ein Aufbringen einer zweiten Faserstoffsuspension mit einem Feuchtigkeitsgehalt in einem weiteren, dem zweiten Transportband zugeordneten Stoffauflauf zwischen 99,8 und 96,0 Gew.-% auf ein zweites permeables oder nicht-permeables Transportband erzeugt. Der genannte Feuchtigkeitsgehalt hat sich als besonders vorteilhaft für die Herstellung der ersten und der zweiten Faserstofflage herausgestellt. Die Faserstoffsuspension enthält dabei Faserstoffe auf Zellulosebasis. Insbesondere kann es sich dabei um mechanisch oder chemisch aufgeschlossene Halbstoffe, insbesondere Holzstoffe und/oder Zellstoffe handeln. Des Weiteren können den Faserstoffsuspensionen Recyclingfasern aus Altpapier oder Altkarton beigemengt werden. Auch ein gewisser Anteil an künstlichen, insbesondere Kunststofffasern und/oder Mineralfasern kann gegebenenfalls den Faserstoffsuspensionen beigegeben werden.In a further advantageous embodiment of the method according to the invention, the first pulp suspension has a moisture content between 99.9 and 96.0 wt .-% in a corresponding, the first conveyor belt associated headbox. In addition, the second fibrous layer is produced by applying a second fibrous suspension having a moisture content in a further, the second conveyor belt associated headbox between 99.8 and 96.0 wt .-% to a second permeable or non-permeable conveyor belt. Said moisture content has proven to be particularly advantageous for the production of the first and second pulp layer. The pulp suspension contains pulps based on cellulose. In particular, these may be mechanically or chemically disrupted pulps, in particular wood pulps and / or pulps. Furthermore, the pulp suspensions recycled fibers from waste paper or old cardboard can be added. Also, a certain proportion of artificial, in particular plastic fibers and / or mineral fibers may optionally be added to the pulp suspensions.

In weiteren vorteilhaften Ausgestaltungen des erfindungsgemäßen Verfahrens werden die einzelnen Fasern und/oder Fasergruppen der zerfaserten und vereinzelten ersten Faserstofflage vor dem Vergautschen mit der mindestens einen weiteren Faserstofflage auf ein drittes permeables oder nicht-permeables Transportband zur Ausbildung der porösen Faserstoffschicht aufgebracht. Damit kann die poröse Faserstoffschicht als einzelne Lage beziehungsweise als einzelnes Blatt ausgebildet werden. Es ist aber auch möglich, dass die einzelnen Fasern und/oder Fasergruppen der zerfaserten und vereinzelten ersten Faserstofflage vor dem Vergautschen mit der zweiten Faserstofflage direkt auf diese zur Ausbildung der porösen Faserstoffschicht aufgebracht werden. Schließlich besteht die Möglichkeit, dass das Verfahren einen weiteren Schritt des Aufbringens mindestens einer weiteren, dritten Faserstoffsuspension mit einem Feuchtigkeitsgehalt in einem weiteren Stoffauflauf zwischen 99,8 und 96,0 Gew.-% auf mindestens ein weiteres permeables oder nicht permeables Transportband unter Bildung einer weiteren, dritten Faserstofflage sowie das Vergautschen der dritten Faserstofflage mit der porösen Faserstoffschicht und/oder der zweiten Faserstofflage umfasst. Je nach Anforderung an die herzustellende mehrlagige Faserstoffbahn kann das erfindungsgemäße Verfahren variiert werden. So kann die poröse Faserstoffschicht direkt auf eine herkömmlich gebildete Faserstofflage aufgetragen werden. Zudem besteht die Möglichkeit anschließend eine weitere Faserstofflage nass aufzugautschen. Es ist aber auch möglich, dass die poröse Faserstoffschicht völlig getrennt von den anderen Faserstofflagen als einzelne Lage ausgebildet wird. Dadurch ergeben sich vorteilhafterweise eine Vielzahl von Verwendungsmöglichkeiten für die erfindungsgemäß hergestellte poröse Faserstoffschicht.In further advantageous embodiments of the method according to the invention, the individual fibers and / or fiber groups of the shredded and singulated first fiber layer are applied to a third permeable or non-permeable conveyor belt for forming the porous fibrous layer prior to covering with the at least one further fiber layer. Thus, the porous pulp layer can be formed as a single layer or as a single sheet. However, it is also possible for the individual fibers and / or fiber groups of the fiberized and singulated first fiber layer to be applied directly to the latter for forming the porous fibrous material layer before being covered with the second fiber material layer. Finally, there is the possibility that the method comprises a further step of applying at least one further, third pulp suspension having a moisture content in another headbox between 99.8 and 96.0% by weight to at least one further permeable or non-permeable conveyor belt to form a further, third fiber layer and the Vergautschen the third fiber layer with the porous fibrous layer and / or the second fibrous layer comprises. Depending on the requirements of the multilayer fibrous web to be produced, the method according to the invention can be varied. Thus, the porous pulp layer can be applied directly to a conventionally formed pulp layer. In addition, it is then possible to pull up another fibrous layer wet. But it is also possible that the porous fiber layer is formed completely separate from the other pulp layers as a single layer. This advantageously results in a multiplicity of possible uses for the porous fibrous material layer produced according to the invention.

In einer weiteren vorteilhaften Ausgestaltung des erfindungsgemäßen Verfahrens wird die zweite Faserstofflage oder die dritte Faserstofflage als Deck- oder Rückenlage der mehrlagigen Faserstoffbahn ausgebildet. Eine mit dem erfindungsgemäßen Verfahren hergestellte mehrlagige Faserstoffbahn zeichnet sich unter anderem dadurch aus, dass durch die Ausbildung der porösen Faserstoffschicht eine gute und gleichmäßige Bettung der Decklage erfolgt. Im Vergleich dazu ist zum Beispiel die Bettung der Decklage auf einer Welle in einer Wellpappe relativ schlecht und ungleichmäßig.In a further advantageous embodiment of the method according to the invention, the second fibrous layer or the third fibrous layer is formed as a top or backsheet of the multi-layer fibrous web. A multilayer fibrous web produced by the method according to the invention is characterized inter alia by the fact that the formation of the porous fibrous material layer results in a good and uniform bedding of the cover layer. In comparison, for example, the bedding of the cover layer on a shaft in a corrugated board is relatively poor and uneven.

In weiteren vorteilhaften Ausgestaltungen des erfindungsgemäßen Verfahrens ist die Geschwindigkeit des zweiten permeablen oder nicht-permeablen Transportbandes oder des dritten permeablen oder nicht-permeablen Transportbandes gleich oder ungleich der Geschwindigkeit des ersten permeablen oder nicht-permeablen Transportbandes. Durch die Einstellung der Geschwindigkeiten der einzelnen Transportbänder zueinander ist es vorteilhafterweise möglich unter anderem das Volumen und die Dichte der resultierenden porösen Faserstoffschicht zu steuern und entsprechend einzustellen.In further advantageous embodiments of the method according to the invention, the speed of the second permeable or non-permeable conveyor belt or the third permeable or non-permeable conveyor belt is equal to or not equal to the speed of the first permeable or non-permeable conveyor belt. By adjusting the speeds of the individual conveyor belts to each other, it is advantageously possible, inter alia, to control the volume and density of the resulting porous fibrous layer and adjust accordingly.

Die genannten Transportbänder können zumindest teilweise als Filze oder Siebe ausgebildet sein.The aforementioned conveyor belts may be at least partially formed as felts or screens.

Grundsätzlich kann es vorgesehen sein, dass bei der Herstellung der einzelnen Faserlagen bzw. der einzelnen Faserstoffsuspension(en) Additive wie zum Beispiel Bindemittel, Retentionsmittel, Füllmittel, Farbstoffe, Bleichmittel, Nassverfestiger und/oder weitere Additive in der Papier- und Kartonherstellung verwendete Hilfsstoffe verwendet werden, um den Produktionsprozess und die Eigenschaften und Verarbeitbarkeit der resultierenden mehrlagigen Faserstoffbahn in der gewünschten Weise zu beeinflussen. Geeignete Füllmittel sind in der Regel Mineralstoffe, wie Kaolin, Talkum oder Kalziumkarbonat. Zur Erhöhung der Oberflächenfestigkeit und der Feuchtigkeitsbeständigkeit kann den Faserlagen bzw. der daraus entstehenden Faserbahn Stärke mittels einer Leimpresse oder einem Stärkebad zugegeben werden. Als Retentionsmittel zur Steuerung der Entwässerung bei der Bildung der einzelnen Faserlagen bzw. der Blattbildung kann den Faserstoffsuspensionen beispielsweise Polyethylenimin zugegeben werden. Als Additive können dabei grundsätzlich Biopolymere, beispielsweise Hemicellulose, Cellulose, Lignin und/oder Polyosen, und/oder Polysaccharide, beispielsweise Stärke, Stärkepolymere, Alginate, Chitine, Hemicellulose, Cellulosederivate, Celluloseester, Celluloseacetat, Cellulosetriacetat, Cellulosenitrat, Celluloseether, Ethylcellulose, Methylcellulose, Oxyethylcellulose, Oxypropylcellulose und Carboxymethylcellulose verwendet werden. Weitere grundsätzlich verwendbare Additive umfassen Harze wie etwa Phenolformaldehydharze, Melaminformaldehydharze, Mischungen aus Phenolformaldehydharzen und Melaminformaldehydharzen, neutrale oder anionische Polymere, Polyvinylalkohol, Polyacrylamid, anionische oder kationische Polyelektrolyte wie beispielsweise Acrylsäure, Carboxymethylcellulose, anionische oder kationische Stärke, Polydiallyldiamoniumchlorid (PolyDADMAC)) oder Polyvinylamin, natürliche Trockenfestmittel wie beispielsweise Galactomannan oder Alginate, synthetische Trockenfestmittel wie beispielsweise Polyamine, Polyamide, Polyalkohole, Polyacrylamide, Polyvinylalkohol, Polyvinyl(alkoholacetat), Polyimine oder Polyethylenimin (PEI), vernetzende oder physikalische Nassfestmittel wie beispielsweise Glyoxal, Glutardialdehyd (1,5-Pentandialdehyd), Aldehydstärke, Polyamidoamin-Epichlorhydrin (PAAE), Melamin-Formaldehyd (MF) oder Harnstoff-Formaldehyd (HF), basische, saure und/oder substantive Farbstoffe (Direktfarbstoffe), Flammschutzmittel wie beispielsweise halogenierte Flammschutzmittel, Organophosphor-Flammschutzmittel oder anorganische Flammschutzmittel wie etwa Aluminiumhydroxid, Magnesiumhydroxid, Ammoniumsulfat, Antimontrioxid oder Antimonpentoxid. Schließlich können auch Additive aus den Gruppen, Fixiermittel, Aluminiumsalze, Flammhemmungsmittel, Entschäumer, Entlüfter, Ligninderivate, Ligninsulfonate, Biozide und/oder Fungizide verwendet werden. Die Additive können dabei grundsätzlich ein- oder mehrmals an der gleichen Stelle und/oder an unterschiedlichen Stellen des Herstellungsprozesses zugegeben werden.In principle, it may be provided that in the production of the individual fiber layers or the individual pulp suspension (s) additives such as binders, retention aids, fillers, dyes, bleach, wet strength and / or other additives used in paper and board making used adjuvants In order to influence the production process and the properties and processability of the resulting multilayer fibrous web in the desired manner. Suitable fillers are usually minerals, such as kaolin, talc or calcium carbonate. To increase the surface strength and the moisture resistance, starch can be added to the fiber layers or to the resulting fiber web by means of a size press or a starch bath. As a retention agent for controlling the dewatering in the formation of the individual fiber layers or the formation of sheets, polyethylene pulp may be added to the pulp suspensions, for example. In principle, biopolymers, for example hemicellulose, cellulose, lignin and / or polyoses, and / or polysaccharides, for example starch, starch polymers, alginates, chitins, hemicellulose, cellulose derivatives, cellulose esters, cellulose acetate, cellulose triacetate, cellulose nitrate, cellulose ethers, ethylcellulose, methylcellulose, Oxyethylcellulose, oxypropylcellulose and carboxymethylcellulose are used. Other generally useful additives include resins such as phenol-formaldehyde resins, melamine-formaldehyde resins, mixtures of phenol-formaldehyde resins and melamine-formaldehyde resins, neutral or anionic polymers, polyvinyl alcohol, polyacrylamide, anionic or cationic polyelectrolytes such as acrylic acid, carboxymethylcellulose, anionic or cationic starch, polydiallyldiamonium chloride (PolyDADMAC)) or polyvinylamine, natural dry strength agents such as galactomannan or alginates, synthetic dry strength agents such as polyamines, polyamides, polyalcohols, polyacrylamides, polyvinyl alcohol, polyvinyl (alcohol acetate), polyimines or polyethylenimine (PEI), crosslinking or physical wet strength agents such as glyoxal, glutardialdehyde (1,5-pentanedialdehyde) , Aldehyde starch, polyamidoamine-epichlorohydrin (PAAE), melamine-formaldehyde (MF) or urea-formaldehyde (HF), basic, acidic and / or substantive dyes (direct dyes offe), flame retardants such as halogenated flame retardants, organophosphorus flame retardants or inorganic Flame retardants such as aluminum hydroxide, magnesium hydroxide, ammonium sulfate, antimony trioxide or antimony pentoxide. Finally, additives from the groups, fixatives, aluminum salts, flame retardants, defoamers, deaerators, lignin derivatives, lignosulfonates, biocides and / or fungicides may also be used. The additives can in principle be added one or more times at the same point and / or at different points in the production process.

Die Erfindung betrifft weiterhin eine Vorrichtung zur Herstellung einer mehrlagigen Faserstoffbahn, insbesondere einer Papier- oder Kartonbahn, umfassend mindestens eine erste und eine zweite Faserstofflage, wobei die Vorrichtung mindestens eine Zerfaserungsvorrichtung zum Zerfasern und/oder zur Vereinzelung der ersten Faserstofflage zu einzelnen Fasern und/oder Fasergruppen bei einem Feuchtigkeitsgehalt zwischen 95 und 40 Gew.-% aufweist. Durch das Zerfasern und/oder Vereinzeln der ersten Faserstofflage ist es wiederum möglich, eine poröse Faserstoffschicht mittels der einzelnen Fasern und/oder Fasergruppen der ersten Faserstofflage auszubilden. Insgesamt kann daher vorteilhafterweise durch die erfindungsgemäße Vorrichtung eine mehrlagige Faserstoffbahn hergestellt werden, die einerseits kostengünstig herstellbar ist und eine verbesserte Festigkeit in z-Richtung (senkrecht zur Faserbahnebene) aufweist. Des Weiteren weist die mit der erfindungsgemäßen Vorrichtung hergestellte mehrlagige Faserstoffbahn ein erhöhtes Volumen bei einer gleichzeitigen Verringerung der Dichte auf. Schließlich sind eine hohe Steifigkeit und gute Wärmedämmeigenschaften der so hergestellten mehrlagigen Faserstoffbahn zu beobachten. Die erste Faserstofflage wird dabei mittels Auftragen einer ersten Faserstoffsuspension mit einem Feuchtigkeitsgehalt in einem Stoffauflauf zwischen 99,9 und 96,0 Gew.-% auf ein erstes permeables oder nicht-permeables Transportband gebildet.The invention further relates to a device for producing a multilayer fibrous web, in particular a paper or board web, comprising at least a first and a second fibrous layer, wherein the device at least one Zerfaserungsvorrichtung for defibering and / or for separating the first fibrous layer to individual fibers and / or Having fiber groups at a moisture content between 95 and 40 wt .-%. By fibrillating and / or singulating the first fibrous layer, it is again possible to form a porous fibrous material layer by means of the individual fibers and / or fiber groups of the first fibrous material layer. Overall, therefore, a multi-layer fibrous web can advantageously be produced by the device according to the invention, which on the one hand is inexpensive to produce and has improved strength in the z-direction (perpendicular to the fiber web level). Furthermore, the multilayer fibrous web produced with the device according to the invention has an increased volume with a simultaneous reduction in the density. Finally, a high rigidity and good thermal insulation properties of the multilayer fibrous web thus produced can be observed. The first pulp layer is formed by applying a first pulp suspension having a moisture content in a headbox between 99.9 and 96.0 wt .-% to a first permeable or non-permeable conveyor belt.

In vorteilhaften Ausgestaltungen der erfindungsgemäßen Vorrichtung ist die Zerfaserungsvorrichtung kamm-, bürsten- oder rollenartig ausgebildet. Auch andere Ausgestaltungen der Zerfaserungsvorrichtung sind denkbar, wobei diese eine Zerfaserung und/oder eine Vereinzelung der ersten Faserstofflage zu einzelnen Fasern und/oder Fasergruppen ermöglichen müssen. Dabei kann die Zerfaserungsvorrichtung an einem in Transportrichtung der ersten Faserstofflage endseitigen Bereich des ersten Transportbandes angeordnet sein. Die Länge und/oder Ausgestaltung des ersten Transportbandes ist dabei derart gewählt, dass der Feuchtigkeitsgehalt der ersten Faserstofflage zwischen 95 und 40 Gew.-% liegt. Unterhalb des endseitigen Bereichs des ersten Transportbandes kann ein zweites permeables oder nicht-permeables Transportband zur Aufnahme der zerfaserten und/oder vereinzelten Fasern und/oder Fasergruppen der ersten Faserstofflage angeordnet sein. Dabei kann auf dem zweiten Transportband bereits eine zweite Faserstofflage durch ein Aufbringen einer zweiten Faserstoffsuspension mit einem Feuchtigkeitsgehalt in einem entsprechend zugeordneten Stoffauflauf zwischen 99,8 und 96,0 Gew.-% aufgetragen sein. Die vereinzelten Fasern und/oder Fasergruppen der ersten Faserstofflage werden dann direkt auf die zweite Faserstofflage aufgetragen und bilden eine poröse Faserstoffschicht aus. Es ist aber auch möglich, dass die vereinzelten Fasern und/oder Fasergruppen direkt auf das zweite Transportband zur Ausbildung der porösen Faserstoffschicht aufgetragen werden. Des Weiteren besteht die Möglichkeit, dass die Geschwindigkeit des zweiten Transportbandes und/oder eines weiteren permeablen oder nicht-permeablen Transportbandes gleich oder ungleich der Geschwindigkeit des ersten Transportbandes ist. Damit lassen sich vorteilhafterweise die Eigenschaften wie Dichte und Volumen der porösen Faserstoffschicht einstellen und steuern.In advantageous embodiments of the device according to the invention, the fiberizing device is comb-shaped, brush-shaped or roller-like. Other refinements of the fiberizing device are also conceivable, and these must enable defibration and / or singling of the first fibrous layer to form individual fibers and / or fiber groups. It can the Defibrillation device to be arranged on a in the transport direction of the first pulp layer end-side region of the first conveyor belt. The length and / or configuration of the first conveyor belt is selected such that the moisture content of the first fiber layer is between 95 and 40 wt .-%. Below the end region of the first conveyor belt, a second permeable or non-permeable conveyor belt for receiving the shredded and / or separated fibers and / or fiber groups of the first fiber layer can be arranged. In this case, a second pulp layer can already be applied by applying a second pulp suspension having a moisture content in a correspondingly assigned headbox between 99.8 and 96.0 wt .-% on the second conveyor belt. The separated fibers and / or fiber groups of the first fiber layer are then applied directly to the second fiber layer and form a porous fibrous layer. But it is also possible that the separated fibers and / or fiber groups are applied directly to the second conveyor belt to form the porous fibrous layer. Furthermore, there is the possibility that the speed of the second conveyor belt and / or another permeable or non-permeable conveyor belt is equal to or not equal to the speed of the first conveyor belt. This advantageously allows the properties such as density and volume of the porous fibrous material layer to be adjusted and controlled.

In weiteren vorteilhaften Ausgestaltungen der erfindungsgemäßen Vorrichtung umfasst die Vorrichtung mindestens eine Pressvorrichtung zum Vergautschen von zumindest der zweiten Faserstofflage mit einer aus den zerfaserten und/oder vereinzelten Fasern und/oder Fasergruppen gebildeten porösen Faserstoffschicht und/oder mindestens eine Trocknungsvorrichtung zum Trocknen der mehrlagigen Faserstoffbahn und/oder mindestens einen Kalander und/oder mindestens eine Leim- und/oder Klebevorrichtung und/oder mindestens einen Abnahmevorrichtung zur Abnahme der Faserbahn von dem entsprechenden Transportband und/oder mindestens eine Auftragsvorrichtung für Zusatzstoffe und/oder mindestens eine Schneidvorrichtung. Je nach Anforderungen an das Endprodukt, nämlich der mehrlagigen Faserstoffbahn kann die erfindungsgemäße Vorrichtung eine oder mehrere der genannten Maschinenelemente umfassen.In further advantageous embodiments of the device according to the invention, the device comprises at least one pressing device for covering at least the second fibrous layer with a porous fibrous layer formed from the defibred and / or separated fibers and / or fiber groups and / or at least one drying device for drying the multilayer fibrous web and / or or at least one calender and / or at least one glueing and / or gluing device and / or at least one picking device for picking up the fibrous web from the corresponding conveyor belt and / or at least one application device for additives and / or at least one cutting device. Depending on the requirements of the end product, namely the multilayer fibrous web, the device according to the invention may comprise one or more of said machine elements.

Die vorliegende Erfindung umfasst zudem eine mehrlagige Faserstoffbahn hergestellt nach einem Verfahren wie im Vorhergehenden beschrieben und/oder hergestellt mittels einer ebenfalls im Vorhergehenden beschriebenen Vorrichtung.The present invention also includes a multi-ply fibrous web made by a method as described and / or made by means of a device also described above.

Weitere Merkmale der Erfindung ergeben sich aus den Ansprüchen, den Ausführungsbeispielen sowie anhand der Zeichnungen. Die vorstehend in der Beschreibung genannten Merkmale und Merkmalskombinationen sowie die nachfolgend in den Ausführungsbeispielen genannten Merkmale und Merkmalskombinationen sind nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen verwendbar, ohne den Rahmen der Erfindung zu verlassen. Dabei zeigt:

  • Fig. 1 eine schematische Darstellung einer erfindungsgemäße Vorrichtung zur Herstellung einer mehrlagigen Faserstoffbahn; und
  • Fig. 2 eine schematische Darstellung einer alternativen Ausführungsform der erfindungsgemäßen Vorrichtung zur Herstellung einer mehrlagigen Faserstoffbahn.
Further features of the invention will become apparent from the claims, the exemplary embodiments and with reference to the drawings. The features and combinations of features mentioned above in the description as well as the features and combinations of features mentioned below in the exemplary embodiments can be used not only in the respectively specified combination but also in other combinations, without departing from the scope of the invention. Showing:
  • Fig. 1 a schematic representation of an apparatus according to the invention for producing a multilayer fibrous web; and
  • Fig. 2 a schematic representation of an alternative embodiment of the inventive device for producing a multilayer fibrous web.

Fig. 1 zeigt eine schematische Darstellung einer Vorrichtung 20 zur Herstellung einer mehrlagigen Faserstoffbahn 10, insbesondere einer Papier- oder Kartonbahn. In dem dargestellten Ausführungsbeispiel umfasst die Vorrichtung 20 einen ersten Stoffauflauf 38, über den eine erste Faserstoffsuspension 16 auf ein erstes permeables oder nicht-permeables Transportband 18 aufgetragen wird. Die Faserstoffsuspension 16 umfasst dabei Faserstoffe auf Zellulosebasis. Insbesondere kann die Faserstoffsuspension 16 aus einer Mischung aus Frischfasern und Recyclingfasern aus Altpapier oder Altkarton bestehen. Die Faserstoffsuspension 16 weist im Stoffauflauf 38 einen Feuchtigkeitsgehalt zwischen 99,9 und 96,0 Gew.-% auf. Auf dem ersten Transportband 18 bildet sich dann aus der ersten Faserstoffsuspension 16 eine erste Faserstofflage 12 aus. Fig. 1 shows a schematic representation of an apparatus 20 for producing a multilayer fibrous web 10, in particular a paper or board web. In the illustrated embodiment, the apparatus 20 comprises a first headbox 38, via which a first pulp suspension 16 is applied to a first permeable or non-permeable conveyor belt 18. The pulp suspension 16 comprises pulps based on cellulose. In particular, the pulp suspension 16 may consist of a mixture of virgin fibers and recycled fibers from waste paper or old cardboard. The pulp suspension 16 has a moisture content in the headbox 38 between 99.9 and 96.0 wt .-%. On the first conveyor belt 18 then formed from the first pulp suspension 16, a first pulp layer 12 from.

Man erkennt, dass am endseitigen Bereich des ersten Transportbandes 18 im Bereich einer Transport- und Umlenkwalze 26 eine Zerfaserungsvorrichtung 48 angeordnet ist. Die Zerfaserungsvorrichtung 48 dient zum Zerfasern und/oder zur Vereinzelung der ersten Faserstofflage 12 zu einzelnen Fasern und/oder Fasergruppen 28. Beim Zerfasern und/oder Vereinzeln weist die erste Faserstofflage 12 einen Feuchtigkeitsgehalt zwischen 95 und 40 Gew.-% auf. In dem dargestellten Ausführungsbeispiel ist die Zerfaserungsvorrichtung 48 bürstenartig ausgebildet.It can be seen that at the end region of the first conveyor belt 18 in the region of a transport and deflection roller 26, a fiberizing device 48 is arranged. The shredding device 48 is used for shredding and / or for separating the first pulp layer 12 into individual fibers and / or fiber groups 28. When shredding and / or singulating, the first fiber layer 12 has a moisture content of between 95 and 40% by weight. In the illustrated embodiment, the fiberizing device 48 is formed like a brush.

Des Weiteren erkennt man, dass die zerfaserten und vereinzelten Fasern und/oder Fasergruppen 28 der ersten Faserstofflage 12 auf eine zweite Faserstofflage 14 aufgebracht beziehungsweise aufgeschleudert werden. Die zweite Faserstofflage 14 ist durch ein Aufbringen einer zweiten Fasersuspension 22 über einen zweiten Stoffauflauf 40 auf ein zweites permeables oder nicht-permeables Transportband 24 erzeugt worden. Die zweite Faserstoffsuspension 22 weist im Stoffauflauf 40 einen Feuchtigkeitsgehalt zwischen 99,8 und 96,0 Gew.-% auf. Die so auf die zweite Faserstofflage 14 aufgebrachten Fasern und/oder Fasergruppen 28 bilden über der zweiten Faserstofflage 14 eine poröse Faserstoffschicht 36 aus. Diese poröse Faserstoffschicht 36 weist insbesondere Fasern und/oder Fasergruppen auf, die in z-Richtung, d.h. aus der x-/y-Ebene der Faserstoffbahn 10 hinausragend angeordnet sind. Dadurch ergibt sich ein relativ hohes Volumen der porösen Faserstoffschicht 36 bei einer relativ niedrigen Dichte. Des Weiteren kann eine hohe Festigkeit in z-Richtung erzielt werden.Furthermore, it can be seen that the shredded and separated fibers and / or fiber groups 28 of the first pulp layer 12 are applied or spin-coated onto a second pulp layer 14. The second fibrous material layer 14 has been produced by applying a second fiber suspension 22 via a second headbox 40 to a second permeable or non-permeable conveyor belt 24. The second pulp suspension 22 has a moisture content in the headbox 40 between 99.8 and 96.0 wt .-%. The fibers and / or fiber groups 28 thus applied to the second fibrous material layer 14 form a porous fibrous material layer 36 over the second fibrous material layer 14. This porous pulp layer 36 has in particular fibers and / or fiber groups which are in z-direction, i. are arranged protruding out of the x- / y-plane of the fibrous web 10. This results in a relatively high volume of the porous pulp layer 36 at a relatively low density. Furthermore, a high strength in the z-direction can be achieved.

In dem dargestellten Ausführungsbeispiel wird auf die poröse Faserstoffschicht 36 eine dritte Faserstofflage 34 aufgebracht. Die dritte Faserstofflage 34 wird über einen dritten Stoffauflauf 42, der eine dritte Faserstoffsuspension 30 auf ein weiteres permeables oder nicht-permeables Transportband 32 aufträgt, gebildet. Im dritten Stoffauflauf 42 weist die dritte Faserstoffsuspension 30 einen Feuchtigkeitsgehalt zwischen 99,8 und 96,0 Gew.-% auf. Sowohl die zweite wie auch die dritte Faserstoffsuspension 30 enthalten Faserstoffe auf Zellulosebasis oder anderer Herkunft. Hierbei kann es sich um sogenannte Frischfasern und/oder Recyclingfasern und/oder künstlich erzeugte Fasern handeln.In the illustrated embodiment, a third pulp layer 34 is applied to the porous pulp layer 36. The third pulp layer 34 is formed via a third headbox 42, which applies a third pulp suspension 30 to another permeable or non-permeable conveyor belt 32. In the third headbox 42, the third pulp suspension 30 has a moisture content of between 99.8 and 96.0% by weight. Both the second and third pulp suspension 30 contain cellulosic or other source pulps. These may be so-called virgin fibers and / or recycled fibers and / or artificially produced fibers.

Des Weiteren erkannt man, dass die poröse Faserstoffschicht 36 mit der als Rückenlage dienenden zweiten Faserstofflage und der als Decklage dienenden dritten Faserstofflage 34 mittels einer Pressvorrichtung 44 vergautscht wird. Nach dem Vergautschen erfolgt eine Trocknung der mehrlagigen Faserstoffschicht 10 sowie optional der Auftrag von einem oder mehreren Strichen. Des Weiteren weist die Vorrichtung 20 eine Abnahmevorrichtung 46 zur Abnahme der Faserstoffbahn 10 von dem Transportband 24 auf. Nach Verlassen der Vorrichtung 20 kann die mehrlagige Faserstoffbahn 10 weiter verarbeitet werden.Furthermore, it is recognized that the porous fibrous material layer 36 with the second fibrous layer serving as a backsheet and serving as the topsheet third pulp layer 34 by means of a pressing device 44 is vergautscht. After Vergautschen a drying of the multi-layer fibrous layer 10 and optionally the application of one or more strokes. Furthermore, the device 20 has a removal device 46 for removing the fibrous web 10 from the conveyor belt 24. After leaving the device 20, the multi-layer fibrous web 10 can be further processed.

Fig. 2 zeigt eine schematische Darstellung einer alternativen, zweiten Ausführungsform der Vorrichtung 20 zur Herstellung einer mehrlagigen Faserstoffbahn 10. Dabei ist ein Teilbereich der Vorrichtung 20 dargestellt. Man erkennt die Anordnung der bürstenartig ausgebildeten Zerfaserungsvorrichtung 48. Die Zerfaserungsvorrichtung 48 umfasst dabei einen Zylinder 52, an der entsprechende Borsten oder Zacken 54 ausgebildet sind. Die Zerfaserungsvorrichtung 48 dreht sich dabei gegensinnig zu der Transport- und Umlenkwalze 26 des ersten Transportbandes 18. Man erkennt, wie die erste Faserstofflage 12 zerfasert und vereinzelt wird. Die so entstehenden Einzelfasern und/oder Fasergruppen 28 werden in dem dargestellten Ausführungsbeispiel direkt auf ein permeables oder nicht-permeables Transportband 50 aufgebracht. Die mit T gekennzeichneten Pfeile in den Figuren 1 und 2 stellen die Transportrichtungen der Transportbänder 18, 24, 32, 50 dar. Fig. 2 shows a schematic representation of an alternative, second embodiment of the device 20 for producing a multilayer fibrous web 10. Here, a portion of the device 20 is shown. The arrangement of the brush-like fiberizing device 48 can be seen. The fiberizing device 48 comprises a cylinder 52 on which corresponding bristles or prongs 54 are formed. The shredding device 48 rotates in opposite directions to the transport and deflection roller 26 of the first conveyor belt 18. It can be seen how the first fiber layer 12 is defibrated and separated. The resulting individual fibers and / or fiber groups 28 are applied directly to a permeable or non-permeable conveyor belt 50 in the illustrated embodiment. The arrows marked T in the FIGS. 1 and 2 represent the transport directions of the conveyor belts 18, 24, 32, 50 represents.

Durch die Bewegung des Transportbandes 50 bildet sich die poröse Faserstoffschicht 36 aus.By the movement of the conveyor belt 50, the porous pulp layer 36 is formed.

Die in den Unterlagen angegebenen Parameterwerte zur Definition von Prozess- und Messbedingungen für die Charakterisierung von spezifischen Eigenschaften des Erfindungsgegenstands sind auch im Rahmen von Abweichungen beispielsweise aufgrund von Messfehlern, Systemfehlern, Einwaagefehlern, DIN-Toleranzen und dergleichen als vom Rahmen der Erfindung mitumfasst anzusehen.The parameter values given in the documents for the definition of process and measurement conditions for the characterization of specific properties of the subject invention are also to be regarded as included within the scope of deviations, for example due to measurement errors, system errors, weight errors, DIN tolerances and the like.

Claims (15)

  1. Method for producing a multi-layer fibrous-material web (10), in particular a paper or cardboard web, including at least one first and one second fibrous-material layer (12, 14), characterized in that the method includes at least the following steps of:
    - applying a first fibrous-material suspension (16) to a first permeable or non-permeable conveyor belt (18) for forming a first fibrous-material layer (12);
    - defibering and/or isolating the first fibrous-material layer (12) at a moisture content between 95 and 40 % by wt. to individual fibers and/or fiber groups (28);
    - forming a porous fibrous-material layer (36) by means of the individual fibers and/or fiber groups (28) of the first fibrous-material layer (12); and
    - couching the porous fibrous-material layer (36) with the second fibrous-material layer with formation of the multi-layer fibrous-material web (10).
  2. Method according to claim 1, characterized in that the first fibrous-material suspension (16) is formed with a moisture content between 99.9 and 96.0 % by wt. in a head box (38) and the second fibrous-material layer (14) is generated by applying a second fibrous-material suspension (22) formed with a moisture content between 99.8 and 96.0 % by wt. in a second head box (40) to a second permeable or non-permeable conveyor belt (24).
  3. Method according to claim 1 or 2, characterized in that the individual fibers and/or fiber groups (28) of the defibered and isolated first fibrous-material layer (12) are applied to a third permeable or non-permeable conveyor belt (50) for forming the porous fibrous-material layer (36) before couching with the at least one further fibrous-material layer (14).
  4. Method according to claim 1 or 2, characterized in that before couching with the second fibrous-material layer (14) the individual fibers and/or fiber groups (28) of the defibered and isolated first fibrous-material layer (12) are directly applied to it for forming the porous fibrous-material layer (36).
  5. Method according to any one of the preceding claims, characterized in that the method includes the further step of applying at least one further third fibrous-material suspension (30) formed with a moisture content between 99.8 and 96.0 % by wt. in a further head box (42) to at least one further permeable or non-permeable conveyor belt (32) with formation of a further, third fibrous-material layer (34) as well as couching the third fibrous-material layer (34) with the porous fibrous-material layer (36) and/or the second fibrous-material layer (14).
  6. Method according to any one of the preceding claims, characterized in that the second fibrous-material layer (14) or the third fibrous-material layer (34) is formed as a cover or back layer of the multi-layer fibrous-material web (10).
  7. Method according to any one of claims 2 to 6, characterized in that the speed of the second conveyor belt (24) or the third conveyor belt (50) is equal or unequal to the speed of the first conveyor belt (18).
  8. Method according to any one of the preceding claims, characterized in that fibrous materials based on cellulose and/or artificial, in particular plastic fibers and/or mineral fibers are used for forming the fibrous-material layers (12, 14, 34).
  9. Method according to any one of the preceding claims, characterized in that binders, retention agents, fillers, dyes, bleachers, wet strength agents and/or other additives used in the paper and cardboard production are added to the fibrous-material layers (12, 14, 34) and/or the porous fibrous-material layer (36).
  10. Device for producing a multi-layer fibrous-material web (10), in particular a paper or cardboard web, including at least one first and one second fibrous-material layer (12, 14), characterized in that the device (20) comprises at least one defibering device (48) for defibering and/or for isolating the first fibrous-material layer (12) to individual fibers and/or fiber groups (28) at a moisture content between 95 and 40 % by wt.
  11. Device according to claim 10, characterized in that the defibering device (48) is formed comb-, brush- or roller-like.
  12. Device according to claim 10 or 11, characterized in that the defibering device (48) is disposed in an area on the end side in the transport direction of the first fibrous-material layer (12) of a first permeable or non-permeable conveyor belt (18).
  13. Device according to claim 12, characterized in that a second permeable or non-permeable conveyor belt (24) for receiving the defibered and/or isolated fibers and/or fiber groups (28) of the first fibrous-material layer (12) is disposed below the end-side area of the first conveyor belt (18).
  14. Device according to any one of claims 10 to 13, characterized in that the device (20) furthermore includes at least one pressing device (44) for couching at least the second fibrous-material layer (14) with a porous fibrous-material layer (36) formed of the defibered and/or isolated fibers and/or fiber groups (28) and/or at least one drying device for drying the multi-layer fibrous-material web (10) and/or at least one calender and/or at least one gluing and/or adhering device and/or at least one take-over device (46) and/or at least one applying device for additives and/or at least one cutting device.
  15. Multi-layer fibrous-material web produced according to a method according to any one of claims 1 to 9 and/or produced by means of a device (20) according to any one of claims 10 to 14.
EP13175143.0A 2013-07-04 2013-07-04 Method and apparatus for producing a multilayer fibrous web, and multilayer fibrous web produced according to the method Active EP2821547B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
SI201331053T SI2821547T1 (en) 2013-07-04 2013-07-04 Method and apparatus for producing a multilayer fibrous web, and multilayer fibrous web produced according to the method
PL13175143T PL2821547T3 (en) 2013-07-04 2013-07-04 Method and apparatus for producing a multilayer fibrous web, and multilayer fibrous web produced according to the method
ES13175143.0T ES2671938T3 (en) 2013-07-04 2013-07-04 Method and device for the manufacture of a band of multilayer fibrous material and band of multilayer fibrous material that is manufactured in accordance with this
TR2018/07985T TR201807985T4 (en) 2013-07-04 2013-07-04 The method and apparatus for producing multilayer fibrous material tissue and the multilayer fibrous material tissue produced according to this method.
HUE13175143A HUE037818T2 (en) 2013-07-04 2013-07-04 Method and apparatus for producing a multilayer fibrous web, and multilayer fibrous web produced according to the method
EP13175143.0A EP2821547B1 (en) 2013-07-04 2013-07-04 Method and apparatus for producing a multilayer fibrous web, and multilayer fibrous web produced according to the method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13175143.0A EP2821547B1 (en) 2013-07-04 2013-07-04 Method and apparatus for producing a multilayer fibrous web, and multilayer fibrous web produced according to the method

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EP2821547A1 EP2821547A1 (en) 2015-01-07
EP2821547B1 true EP2821547B1 (en) 2018-03-28

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EP13175143.0A Active EP2821547B1 (en) 2013-07-04 2013-07-04 Method and apparatus for producing a multilayer fibrous web, and multilayer fibrous web produced according to the method

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EP (1) EP2821547B1 (en)
ES (1) ES2671938T3 (en)
HU (1) HUE037818T2 (en)
PL (1) PL2821547T3 (en)
SI (1) SI2821547T1 (en)
TR (1) TR201807985T4 (en)

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ES2668774T3 (en) * 2015-07-20 2018-05-22 Mayr-Melnhof Karton Ag Multilayer cardboard material and method for manufacturing a multilayer cardboard material

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Publication number Priority date Publication date Assignee Title
CA2066811A1 (en) * 1991-04-23 1992-10-24 Dinkar G. Wagle Method of producing multi-ply paper and board products exhibiting increased stiffness
DE10002547A1 (en) * 1999-01-28 2000-08-03 Voith Sulzer Papiertech Patent Papermaking machine based on double sieve conveyors and balanced, constant pressure de-watering, includes additive supply unit with controller varying volumetric flow and pressure
DE10254301A1 (en) * 2002-11-21 2004-06-03 Voith Paper Patent Gmbh Process and wire section of a machine for producing a multi-layer fibrous web

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Also Published As

Publication number Publication date
ES2671938T3 (en) 2018-06-11
PL2821547T3 (en) 2018-09-28
TR201807985T4 (en) 2018-06-21
HUE037818T2 (en) 2018-09-28
EP2821547A1 (en) 2015-01-07
SI2821547T1 (en) 2018-07-31

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