EP2640890B1 - Device and method for producing a material web - Google Patents

Device and method for producing a material web Download PDF

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Publication number
EP2640890B1
EP2640890B1 EP11773254.5A EP11773254A EP2640890B1 EP 2640890 B1 EP2640890 B1 EP 2640890B1 EP 11773254 A EP11773254 A EP 11773254A EP 2640890 B1 EP2640890 B1 EP 2640890B1
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EP
European Patent Office
Prior art keywords
fibrous web
permeable
belt
press
pressing
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.)
Not-in-force
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EP11773254.5A
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German (de)
French (fr)
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EP2640890A1 (en
Inventor
Manfred Feichtinger
Luiz Carlos Silva
Thomas Scherb
Joao Victor Boechat
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Voith Patent GmbH
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Voith Patent GmbH
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Publication date
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Priority to EP13198087.2A priority Critical patent/EP2712958B1/en
Publication of EP2640890A1 publication Critical patent/EP2640890A1/en
Application granted granted Critical
Publication of EP2640890B1 publication Critical patent/EP2640890B1/en
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    • 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
    • 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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0272—Wet presses in combination with suction or blowing devices

Definitions

  • the invention relates to a machine for producing a multilayer fibrous web, in particular a board web, having a basis weight of more than 40 g / m 2 , with a forming region for forming the fibrous web layers at least two Lagenformier Schemee to form the multilayer fibrous web, as well as with a the molding area subsequent pressing area.
  • the invention also relates to a method for producing a multilayer fibrous web, as well as the use of the machine.
  • the document EP1780332 A1 describes a machine for producing a board web.
  • the board web of 4 fibrous web layers, which are each formed in Lagenformier Schemeen, produced in the forming area.
  • the further dewatering by roll pressing in a pressing area.
  • the drying takes place in a subsequent drying section.
  • a Yankee cylinder is provided within the dryer section.
  • a broad nip calender is installed to further improve the smoothness of the board web. This is followed by a coating device for applying a stroke to one side of the board web, followed by final drying and reeling of the board web.
  • tissue web is passed between a circulating permeable belt and a circulating permeable support belt lying through a press zone.
  • the object of the present invention is to improve the known manufacturing process for a paper and board web in terms of their quality and its cost-effectiveness.
  • a dewatering unit with a press zone through which the fibrous web between a circumferential, permeable belt and a circumferential, permeable support belt is passed, is provided, and wherein the pressing zone is formed such that the permeable belt, the Fiber web and the permeable support band, at least on a part of Length of the press zone, can be flowed through by a fluid and the press zone is formed by a permeable pressing member and a permeable counter element and the dewatering unit is arranged in the pressing region such that the fibrous web is taken from a preceding surface by the permeable belt or by the permeable support belt and is guided through the press zone.
  • the fibrous web is gently dewatered, wherein the applied mechanical dewatering pressure can be adjusted almost independent of the intensity of the flow through the fibrous web with the fluid.
  • the strength values of the multilayer fibrous web in particular the splitting strength, are improved.
  • the drainage is very volume-saving, so that the thickness of the fibrous web decreases less by the pressing process than in the known manufacturing processes. Since the thickness of the fibrous web substantially influences the mechanical strength, as for example in the case of a bending load, the mechanical strength of the fibrous web can be increased by the solution according to the invention or fiber material can be saved by reducing the basis weight with the same strength.
  • the solution according to the invention makes it possible to produce a paper or board web, in particular a folding carton web with a high specific volume and at the same time good smoothness.
  • the flow direction of the fluid is selected so that first the permeable pressing element, then the permeable band, the fibrous web or the fibrous web layer and then the permeable support band are flowed through.
  • the permeable pressing element is preferably a mechanical pressing element for forming a mechanical pressure on the permeable band and thus on the fibrous web.
  • the counter element is designed as a roller or a box with a curved or flat contact surface
  • the roller is preferably a suction roller.
  • it has an internal suction box with one, preferably two or more suction zones. These extend essentially, as seen in the machine direction, to the length of the press zone.
  • the suction roll can also be designed as a grooved or grooved and drilled roll.
  • an external suction box may be provided for sucking the grooves. This results in an efficient flow guidance of the fluid through the press zone. Flow losses can be minimized.
  • the permeable pressing element consists of a press belt and / or a press shoe. If only one press belt is used as the press element, then it is conceivable to use a further press element, for example in the form of a roller or a press shoe, within the press belt loop. Thus, the mechanical dewatering pressure can be increased locally within the press zone.
  • the press shoe serves as a pressing element, it may be designed to be permeable or grooved and / or drilled in order to allow flow through the pressing zone with the fluid.
  • the press belt consists of a screen mesh, a spiral screen, metal mesh, perforated metal strip or a band of composite material, such as carbon fiber reinforced plastic.
  • the press belt has an air permeability of more than 50.8 cm 3 / cm 2 / s (100 cfm), in particular more than 101.6 cm 3 / cm 2 / s (200 cfm), where "cfm" indicates the cubic feet of air flowing through the press belt at a differential pressure of 125 Pa per area of press belt in square feet per minute.
  • the measuring procedure is described in the TAPPI T251 standard.
  • the area of air permeability has the advantage that at a given Differential pressure between the side facing away from the fibrous web side of the permeable support belt and the side facing away from the permeable belt side of the Pressbandes, a very high volume flow of fluid through the fibrous web can flow. Another advantage is that it keeps the mechanical pressure generated by the flow small.
  • the press belt is designed so that a tensile stress of more than 30 kN / m, in particular of more than 40 kN / m, in particular of more than 45 kN / m in operation of the machine is possible.
  • the dewatering unit is preferably configured so that the pressure on the fibrous web is less than 0.9 bar, in particular less than 0.5 bar, preferably less than 0.2 bar.
  • the diameter of the counter element is advantageously greater than 1 m, or the radius of curvature of the counter element is greater than 0.5m.
  • the permeable tape may have a structured surface for structuring the fibrous web and / or at least one fibrous web layer. This is especially true for fibrous webs which only need to be smooth on one side or for fibrous web layers which form an inner fibrous web layer of the multilayer fibrous web. This allows a high specific volume without compromising the quality of the fibrous web in terms of the required smoothness.
  • the permeable band is formed by a forming fabric.
  • Forming screens are designed marking poor. This is achieved by known weaves.
  • the weave structure has bases in relation to the fibrous web.
  • weaves are used which have more than 1300 support points per cm 2 , in particular more than 1400 support points per cm 2 , preferably more than 1500 support points per cm 2 . This has the advantage that a good smoothness is achievable.
  • the permeable band is formed by a felt.
  • the permeable band can be formed by a nonwoven, permeable band, which is coated at least on the side which touches the fibrous web. It is also conceivable that the permeable band consists of a plastic band which preferably has an internal reinforcement made of a fabric band or a thread band.
  • the permeable support band is preferably formed by a felt. This can absorb at least a portion of the originating from the fibrous web water.
  • the permeable support band may also be formed by a forming fabric.
  • three or more ply forming areas are provided in the machine.
  • a hood may be provided within the loop of the press belt or the permeable belt.
  • the hood is supplied with the preferably hot fluid.
  • the hot fluid used is air and / or steam.
  • the hot air can advantageously come from the exhaust air of a drying unit of the paper machine, such as the hood exhaust air of a Glättzylinders. Tests have shown that the dewatering unit can increase the dry content of the fibrous web from, for example, 18% to 40%, while the dry content could be increased to only 39% by two roller presses with a higher pressing pressure. The invention thus brings in addition to the increase in the quality of the fibrous web thus also economic advantages.
  • a steam blow pipe preferably be provided at the beginning of the press zone.
  • the foregoing surface is preferably formed by a forming fabric of a sheet forming region.
  • the dewatering unit is preceded by a press nip.
  • the dewatering unit is preceded by a, in particular double-felted, separately standing press nip.
  • the press zone of the dewatering unit is arranged downstream of at least one press nip.
  • the fibrous web is expediently arranged between the permeable support band and the permeable band when passing through the at least one press nip arranged downstream of the press zone of the dewatering unit.
  • the press nip downstream of the press zone of the dewatering unit is formed by a stand-alone roll press. It is possible that in this case the fibrous web is arranged between the permeable support band and the permeable band.
  • the press zone of the dewatering unit is arranged according to ordered press nip by an arranged in the loop of the permeable belt press roll and the counter element of the dewatering unit.
  • the counter element is preferably designed as a suction roll. It is possible that in this case the fibrous web is arranged between the permeable support band and the permeable band.
  • downstream press nip is designed as a suction press, in which a press roll is designed as a suction press roll.
  • At least one of the press zone of the dewatering unit downstream press nip is formed by a press roll and a smoothing roll and simply felted, wherein one side of the fibrous web is in contact with the smooth surface of the smoothing roll.
  • At least one of the press zone of the dewatering unit downstream press nip is formed by two smoothing rolls, both sides of the fibrous web come into contact with the smooth surface of the associated smoothing roll.
  • drying devices and a winding unit follow after the pressing area. Between the drying devices and / or after the drying devices is at least one coating unit for at least one-sided application of coating medium provided on the fibrous web.
  • the coating medium may consist of pigmented coating color, starch and / or glue.
  • the side of the higher smoothness fibrous web is painted.
  • two or more fibrous web layers may be formed in a layer forming region.
  • a multi-layer material flow is used, which is fed with different stock suspensions. These are separated until they leave the headbox and drained in a Lagenformier Scheme. The separation takes place through lamellae in the headbox nozzle.
  • the object is also achieved by a method for producing a multilayer fibrous web, according to claim 13.
  • the paperboard machine is preferably used for the manufacture of cartonboard.
  • the machine according to the invention is particularly suitable for the production of fibrous webs having a basis weight of more than 60 g / m 2 in particular.
  • the FIG. 1 shows a section of a first embodiment of a machine 1 according to the invention.
  • the dewatering unit E is arranged in the pressing region of the machine 1.
  • the pressing area is formed by a permeable pressing belt 5 and a suction roller 7.
  • the fibrous web 2 is removed by means of the permeable support belt 3, which in this example is felt, by means of a suction roll from the surface of the preceding fabric, that is to say the forming fabric 6 and lying between the felt 3 and the permeable belt 4 through the press zone, guided.
  • the fibrous web 2 is mechanically pressed due to the tension of the permeable press belt 5 and simultaneously flows through hot air.
  • the hot air comes from the exhaust air of a drying unit of the paper machine, such as the hood exhaust air of a Glättzylinders and passes through the hood 9 via the fibrous web 2 in the suction zone 10 of the suction roller 7.
  • a drying unit of the paper machine such as the hood exhaust air of a Glättzylinders
  • the fibrous web 2 is traversed in the running direction over the entire length of the pressing zone of hot air.
  • a steam blow pipe 8 is installed at the beginning of the press zone.
  • the steam flows due to the pressure difference between the suction zone 10 and the hood 9 successively in addition by the permeable press belt 5, the permeable belt 4, the fibrous web 2 and through the felt in the suction zone 10 of the suction roller 7.
  • the fibrous web 2 is heated and the Drainage favors.
  • the permeable belt 4 is designed as felt or sieve. After passing through the press zone, the fibrous web 2 is passed through a downstream of the dewatering unit E press nip, which by the press roller 15 and the press roller 16 are formed.
  • the pressure roller 15 lies in the loop of the permeable belt 4 and the pressure roller 16 is in the loop of the permeable support belt 3. This arrangement is characterized by the economy, since no additional clothing is required for the press nip.
  • the fibrous web 2 is passed over a free train through another press nip. This is formed by a smoothing roll 11 and a press roll 12.
  • the smoothing roll 11 is assigned to the upper side of the fibrous web 2. The top of the fibrous web 2 is thus smoothed.
  • a coating application device which applies a pigment coating to the smoothed side of the fibrous web 2.
  • This arrangement improves the surface quality of the fibrous web 2 in terms of further processing property, such as printability.
  • the upper layer of the fibrous web the so-called ceiling layer.
  • the in the FIG. 2 illustrated embodiment is different from the FIG. 1 by the design of the downstream of the dewatering unit E press nip.
  • the upper pressure roller 16 is again arranged in the loop of the support belt 3, while the lower pressure roller 15 is disposed outside the loop of the permeable belt 4 and is in direct contact with the underside of the fibrous web 2. This design also smoothes the bottom.
  • the execution in the FIG. 3 shows a further variant of the dewatering unit E downstream press nip.
  • the press nip is formed by a pressure roller 17 located in the loop of the permeable belt 4 and the suction roller 7 of the dewatering unit E.
  • the suction roller 7 has in the region of the press nip to increase the dry content of the fibrous web 2, a further suction zone 10.1.
  • This suction zone 10.1 is preferably evacuated independently of the suction zone 10.
  • the press roll 17 is partially wrapped in common by the permeable band and the permeable support band. Thereafter, the permeable support belt 3 is separated from the fibrous web 2, which is guided on the permeable belt over a suction element 18.
  • the press felt 13.1 takes the fibrous web 2 from the permeable belt 4 by means of a suction roll and guides them through a downstream smoothing nip formed by the press roll 12 and the smoothing roll 11.
  • the smoothing roll 11 touches the bottom of the fibrous web 2 so that it is smoothed. This design has a convenient web guide for the horizontal continuation of the fibrous web.
  • the fibrous web 2 in contrast to the previous embodiments, removed by the permeable belt 4 by means of a suction roll from the surface of the preceding fabric 6 and passed through the press zone.
  • FIG. 5 shows the mirrored drainage unit E of FIG. 3 ,
  • the arrangements differ only in that the fibrous web 2 is removed by the permeable belt 4 by means of a suction roll from the surface of the preceding fabric 6 and passed through the press zone. In the subsequent smoothing gap, the underside of the fibrous web 2 is smoothed.
  • the permeable belt 4 can be designed as felt or sieve.
  • the permeable support band 3 is formed by a felt. The orderly press nip and smoothing gap is corresponding to the FIG. 3 described.
  • the after-ordered press nip is a separate, ie stand-alone press nip, which is formed by the press rollers 15 and 16.
  • FIGS. 7 and 8th shown arrangements of the dewatering unit E correspond to the arrangements of Figures 3 and 5 , The description therefore applies accordingly to the FIGS. 7 and 8th , The difference is that the drainage unit E is preceded by a separate, ie a stand-alone press nip, which is respectively formed by the press rolls 20 and 21.
  • the lower press roller 21 is designed as a suction press roll.
  • the fabrics 19 and 19.1 are formed as felts.
  • the fibrous web 2 is in the case of FIG. 7 by the permeable support band 3, which is designed in this example as felt, and in the case of FIG. 8 through the permeable belt 4, which in this example is designed as a sieve, removed by means of a suction roller from the surface of the preceding clothing 19.1 and lying through the press zone between the felt 3 and the permeable belt 4, out.
  • the dewatering unit E is arranged in the forming area of the machine 1.
  • the forming fabric 6 forms the permeable support band of the dewatering unit E.
  • the permeable band can be embodied as a felt or as a sieve.
  • the multilayer fibrous web 2 is removed directly from the forming fabric 6 by the felt of a subsequent machine section.
  • the operation of the dewatering unit E is analogous to the previous descriptions.
  • the dewatering unit is integrated into a layer forming area such that the forming fabric 6.1 forms the permeable band.
  • the headbox 22 may be multi-layered, so that several fibrous web layers are formed on a Formiersieb 6.1.
  • the thus formed fibrous web 2 can, as shown, be guided directly to the downstream smoothing nip, or be pored together with a fibrous web ply of another ply forming region and then guided to the downstream smoothing nip.
  • the press roller 15.1 is designed as a shoe press roll.
  • the press rollers 16 and 15.1 thus form an extended nip.
  • the forming fabric 6.1 is designed as felt. This is particularly advantageous for lighter basis weights.
  • the FIG. 11 shows a forming region IV with three Lagenformier Schemee I, II, III.
  • the dewatering unit E is arranged in the layer forming region I, which forms the middle, ie an inner layer of the fibrous web 2.
  • the operation of the drainage unit E is according to the description of the variant of FIG. 9 , However, the fibrous web layer formed is not transferred to a downstream machine section, but first with the on the Lagenformier Scheme II formed fibrous web layer and then sixteengegautscht with the formed on the Lagenformier Scheme III fibrous web layer.
  • the Lagenformier Scheme I is formed from a fourdrinier screen 6.1 with attached Doppelsiebformêtieril 23 and a headbox 22.1.
  • the Lagenformier Schemee II and III are designed as a long sieves 6.2 and 6.3 with the headboxes 22.2 and 22.3.

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Description

Die Erfindung betrifft eine Maschine zur Herstellung einer mehrlagigen Faserstoffbahn, insbesondere einer Kartonbahn, mit einem Flächengewicht von mehr als 40 g/m2, mit einem, mindestens zwei Lagenformierbereiche zur Bildung der Faserstoffbahnlagen umfassenden Formierbereich zur Ausbildung der mehrlagigen Faserstoffbahn, sowie mit einem sich an den Formierbereich anschließenden Pressbereich. Die Erfindung betrifft auch ein Verfahren zur Herstellung einer mehrlagigen Faserstoffbahn, sowie die Verwendung der Maschine.The invention relates to a machine for producing a multilayer fibrous web, in particular a board web, having a basis weight of more than 40 g / m 2 , with a forming region for forming the fibrous web layers at least two Lagenformierbereiche to form the multilayer fibrous web, as well as with a the molding area subsequent pressing area. The invention also relates to a method for producing a multilayer fibrous web, as well as the use of the machine.

Maschinen dieser Art sind bekannt. Das Dokument EP1780332 A1 beschreibt eine Maschine zur Herstellung einer Kartonbahn. Dabei wird die Kartonbahn aus 4 Faserstoffbahnlagen, welche jeweils in Lagenformierbereichen gebildet werden, im Formierbereich hergestellt. Anschließend erfolgt die weitere Entwässerung durch Walzenpressen in einem Pressbereich. Die Trocknung erfolgt in einer darauffolgenden Trockenpartie. Zur Glättung einer Seite der Kartonbahn ist innerhalb der Trockenpartie ein Glättzylinder vorgesehen. Im Anschluss an die Trocknung ist ein Breitnipkalander zur weiteren Verbesserung der Glätte der Kartonbahn installiert. Danach folgt eine Streicheinrichtung zum Auftragen eines Strichs auf eine Seite der Kartonbahn mit anschließender Fertigtrocknung und Aufrollung der Kartonbahn.Machines of this type are known. The document EP1780332 A1 describes a machine for producing a board web. In this case, the board web of 4 fibrous web layers, which are each formed in Lagenformierbereichen, produced in the forming area. Subsequently, the further dewatering by roll pressing in a pressing area. The drying takes place in a subsequent drying section. To smooth one side of the board web, a Yankee cylinder is provided within the dryer section. Following drying, a broad nip calender is installed to further improve the smoothness of the board web. This is followed by a coating device for applying a stroke to one side of the board web, followed by final drying and reeling of the board web.

Im Dokument DE102008054990 A1 ist eine Vorrichtung zur Herstellung von voluminösen Tissueprodukten von sowohl mittlerer als auch von hoher Qualität beschrieben. Die Tissuebahn wird dabei zwischen einem umlaufenden permeablen Band und einem umlaufenden permeablen Stützband liegend durch eine Presszone hindurchgeführt.In the document DE102008054990 A1 there is described an apparatus for producing both medium and high quality voluminous tissue products. The tissue web is passed between a circulating permeable belt and a circulating permeable support belt lying through a press zone.

Die Aufgabe der vorliegenden Erfindung liegt darin, den bekannten Herstellungsprozess für eine Papier- und Kartonbahn hinsichtlich deren Qualität und dessen Wirtschaftlichkeit zu verbessern.The object of the present invention is to improve the known manufacturing process for a paper and board web in terms of their quality and its cost-effectiveness.

Die Aufgabe wird durch die Merkmale des Anspruches 1 gelöst. Erfindungswesentlich ist dabei, dass zur Entwässerung eine Entwässerungseinheit mit einer Presszone, durch die die Faserstoffbahn zwischen einem umlaufenden, permeablen Band und einem umlaufenden, permeablen Stützband liegend, hindurchgeführt wird, vorgesehen ist und wobei die Presszone derart ausgebildet ist, dass das permeable Band, die Faserstoffbahn und das permeable Stützband, zumindest auf einem Teil der Länge der Presszone, von einem Fluid durchströmt werden kann und die Presszone durch ein permeables Presselement und ein permeables Gegenelement gebildet ist und die Entwässerungseinheit im Pressbereich so angeordnet ist, dass die Faserstoffbahn von einer vorangehenden Oberfläche durch das permeable Band oder durch das permeable Stützband übernommen und durch die Presszone geführt wird.The object is solved by the features of claim 1. Essential to the invention is that for dewatering a dewatering unit with a press zone through which the fibrous web between a circumferential, permeable belt and a circumferential, permeable support belt is passed, is provided, and wherein the pressing zone is formed such that the permeable belt, the Fiber web and the permeable support band, at least on a part of Length of the press zone, can be flowed through by a fluid and the press zone is formed by a permeable pressing member and a permeable counter element and the dewatering unit is arranged in the pressing region such that the fibrous web is taken from a preceding surface by the permeable belt or by the permeable support belt and is guided through the press zone.

Durch den Einsatz der erfindungsgemäßen Entwässerungseinheit wird die Faserstoffbahn sanft entwässert, wobei der angewandte mechanische Entwässerungsdruck nahezu unabhängig von der Intensität der Durchströmung der Faserstoffbahn mit dem Fluid eingestellt werden kann. Dadurch werden die Festigkeitswerte der mehrlagigen Faserstoffbahn, insbesondere die Spaltfestigkeit, verbessert. Gleichzeitig erfolgt die Entwässerung sehr volumenschonend, sodass die Dicke der Faserstoffbahn durch den Pressvorgang weniger abnimmt als bei den bekannten Herstellungsprozessen. Da die Dicke der Faserstoffbahn die mechanische Beanspruchbarkeit, wie beispielsweise bei einer Biegebeanspruchung, wesentlich beeinflusst, kann durch die erfindungsgemäße Lösung die mechanische Beanspruchbarkeit der Faserstoffbahn gesteigert oder bei gleicher Beanspruchbarkeit Fasermaterial durch Reduzierung des Flächengewichts eingespart werden. Ebenso ermöglicht die erfindungsgemäße Lösung die Herstellung einer Papier- oder Kartonbahn, insbesondere einer Faltschachtelkartonbahn mit hohem spezifischem Volumen und gleichzeitig guter Glätte.By using the dewatering unit according to the invention, the fibrous web is gently dewatered, wherein the applied mechanical dewatering pressure can be adjusted almost independent of the intensity of the flow through the fibrous web with the fluid. As a result, the strength values of the multilayer fibrous web, in particular the splitting strength, are improved. At the same time the drainage is very volume-saving, so that the thickness of the fibrous web decreases less by the pressing process than in the known manufacturing processes. Since the thickness of the fibrous web substantially influences the mechanical strength, as for example in the case of a bending load, the mechanical strength of the fibrous web can be increased by the solution according to the invention or fiber material can be saved by reducing the basis weight with the same strength. Likewise, the solution according to the invention makes it possible to produce a paper or board web, in particular a folding carton web with a high specific volume and at the same time good smoothness.

Vorteilhafterweise wird die Durchströmrichtung des Fluids so gewählt, dass zuerst das permeable Presselement, danach das permeablen Band, die Faserstoffbahn beziehungsweise die Faserstoffbahnlage und anschließend das permeablen Stützband durchströmt werden.Advantageously, the flow direction of the fluid is selected so that first the permeable pressing element, then the permeable band, the fibrous web or the fibrous web layer and then the permeable support band are flowed through.

Das permeable Presselement ist vorzugsweise ein mechanisches Presselement zur Ausbildung eines mechanischen Druckes auf das permeable Band und somit auf die Faserstoffbahn.The permeable pressing element is preferably a mechanical pressing element for forming a mechanical pressure on the permeable band and thus on the fibrous web.

In praktischen Ausgestaltungsvarianten ist das Gegenelement als eine Walze oder einem Kasten mit gekrümmter oder ebener Kontaktfläche ausgeführtIn practical embodiments, the counter element is designed as a roller or a box with a curved or flat contact surface

Die Walze ist vorzugsweise eine Saugwalze. Vorteilhafterweise weist sie einen innen liegenden Saugkasten mit einer, vorzugsweise zwei oder mehr Saugzonen auf. Diese erstrecken sich im Wesentlichen, in Laufrichtung der Maschine gesehen, auf die Länge der Presszone.The roller is preferably a suction roller. Advantageously, it has an internal suction box with one, preferably two or more suction zones. These extend essentially, as seen in the machine direction, to the length of the press zone.

In weiteren Varianten kann die Saugwalze auch als gerillte oder als gerillte und gebohrte Walze ausgeführt sein. Für beide Varianten kann ein außen liegender Saugkasten zum Besaugen der Rillen vorgesehen sein. Dies ergibt eine effiziente Strömungsführung des Fluids durch die Presszone. Strömungsverluste können so minimiert werden.In other variants, the suction roll can also be designed as a grooved or grooved and drilled roll. For both variants, an external suction box may be provided for sucking the grooves. This results in an efficient flow guidance of the fluid through the press zone. Flow losses can be minimized.

Zweckmäßigerweise besteht das permeable Presselement aus einem Pressband und/oder einem Pressschuh. Wird nur ein Pressband als Presselement verwendet, so ist es denkbar, innerhalb der Pressbandschlaufe ein weiteres Presselement, beispielsweise in Form einer Walze oder eines Pressschuhes, einzusetzen. So kann innerhalb der Presszone der mechanische Entwässerungsdruck lokal erhöht werden. Für den Fall dass der Pressschuh als Presselement dient, kann dieser permeabel oder gerillt und/oder gebohrt ausgeführt sein, um ein Durchströmen der Presszone mit dem Fluid zu ermöglichen.Conveniently, the permeable pressing element consists of a press belt and / or a press shoe. If only one press belt is used as the press element, then it is conceivable to use a further press element, for example in the form of a roller or a press shoe, within the press belt loop. Thus, the mechanical dewatering pressure can be increased locally within the press zone. In the event that the press shoe serves as a pressing element, it may be designed to be permeable or grooved and / or drilled in order to allow flow through the pressing zone with the fluid.

Ferner ist es von Vorteil, wenn das Pressband aus einem Siebgewebe, einem Spiralsieb, Metallsieb, perforiertem Metallband oder einem Band aus Verbundmaterial, wie beispielsweise aus Kohlefaser verstärktem Kunststoff, besteht.Further, it is advantageous if the press belt consists of a screen mesh, a spiral screen, metal mesh, perforated metal strip or a band of composite material, such as carbon fiber reinforced plastic.

In einer praktischen Ausführung weist das Pressband eine Luftdurchlässigkeit von mehr als 50,8 cm3/cm2/s (100 cfm), insbesondere mehr als 101,6 cm3/cm2/s (200 cfm) auf, wobei "cfm" das Luftvolumen in cubic feet angibt, das bei einem Differenzdruck von 125 Pa pro Fläche des Pressbandes in square foot und pro Minute durch das Pressband strömt. Das Messverfahren ist in der Norm TAPPI T251 beschrieben. Der Bereich der Luftdurchlässigkeit hat den Vorteil, dass bei einem gegebenen Differenzdruck zwischen der von der Faserstoffbahn abgewandten Seite des permeablen Stützbandes und der von dem permeablen Band abgewandten Seite des Pressbandes, ein möglichst hoher Volumenstrom des Fluids durch die Faserstoffbahn strömen kann. Ein weiterer Vorteil ist, dass dadurch der durch die Strömung erzeugte mechanische Druck klein bleibt.In a practical embodiment, the press belt has an air permeability of more than 50.8 cm 3 / cm 2 / s (100 cfm), in particular more than 101.6 cm 3 / cm 2 / s (200 cfm), where "cfm" indicates the cubic feet of air flowing through the press belt at a differential pressure of 125 Pa per area of press belt in square feet per minute. The measuring procedure is described in the TAPPI T251 standard. The area of air permeability has the advantage that at a given Differential pressure between the side facing away from the fibrous web side of the permeable support belt and the side facing away from the permeable belt side of the Pressbandes, a very high volume flow of fluid through the fibrous web can flow. Another advantage is that it keeps the mechanical pressure generated by the flow small.

In einer weiteren Ausgestaltung der Erfindung ist das Pressband so gestaltet, dass eine Zugspannung von mehr als 30 kN/m, insbesondere von mehr als 40 kN/m, insbesondere von mehr als 45 kN/m im Betrieb der Maschine möglich ist.In a further embodiment of the invention, the press belt is designed so that a tensile stress of more than 30 kN / m, in particular of more than 40 kN / m, in particular of more than 45 kN / m in operation of the machine is possible.

Die Entwässerungseinheit ist vorzugsweise so konfiguriert, dass der Pressdruck auf die Faserstoffbahn geringer als 0,9 bar insbesondere geringer als 0,5 bar, vorzugsweise geringer als 0,2 bar ist.The dewatering unit is preferably configured so that the pressure on the fibrous web is less than 0.9 bar, in particular less than 0.5 bar, preferably less than 0.2 bar.

Der Durchmesser des Gegenelements ist vorteilhafterweise größer als 1 m, beziehungsweise der Krümmungsradius des Gegenelements ist größer als 0,5m.The diameter of the counter element is advantageously greater than 1 m, or the radius of curvature of the counter element is greater than 0.5m.

Für bestimmte Anwendungen kann das permeable Band eine strukturierte Oberfläche zur Strukturierung der Faserstoffbahn und/oder mindestens einer Faserstoffbahnlage aufweisen. Dies trifft insbesondere für Faserstoffbahnen zu, die nur einseitig glatt sein müssen oder für Faserstoffbahnlagen, welche eine innere Faserstoffbahnlage der mehrlagigen Faserstoffbahn bilden. Dies ermöglicht ein hohes spezifisches Volumen, ohne die Qualität der Faserstoffbahn hinsichtlich der erforderlichen Glätte zu beeinträchtigen.For certain applications, the permeable tape may have a structured surface for structuring the fibrous web and / or at least one fibrous web layer. This is especially true for fibrous webs which only need to be smooth on one side or for fibrous web layers which form an inner fibrous web layer of the multilayer fibrous web. This allows a high specific volume without compromising the quality of the fibrous web in terms of the required smoothness.

In einer weiteren Ausgestaltung der Erfindung wird das permeable Band durch ein Formiersieb gebildet. Formiersiebe sind dabei markierungsarm gestaltet. Dies wird durch bekannte Webarten erreicht. Die Webstruktur weist Stützpunkte in Bezug zur Faserstoffbahn auf. Vorzugsweise werden Webarten eingesetzt, welche mehr als 1300 Stützpunkte pro cm2, insbesondere mehr als 1400 Stützpunkte pro cm2, vorzugsweise mehr als 1500 Stützpunkte pro cm2 aufweisen. Dies hat den Vorteil, dass eine gute Glätte erreichbar ist.In a further embodiment of the invention, the permeable band is formed by a forming fabric. Forming screens are designed marking poor. This is achieved by known weaves. The weave structure has bases in relation to the fibrous web. Preferably, weaves are used which have more than 1300 support points per cm 2 , in particular more than 1400 support points per cm 2 , preferably more than 1500 support points per cm 2 . This has the advantage that a good smoothness is achievable.

Es ist auch möglich, dass das permeable Band durch einen Filz gebildet ist.It is also possible that the permeable band is formed by a felt.

In einer Weiterentwicklung kann das permeable Band durch ein nicht gewobenes, permeables Band gebildet sein, welches zumindest auf der die Faserstoffbahn berührenden Seite beschichtet ist. Es ist auch denkbar, dass das permeable Band durch ein Kunststoffband, welches vorzugsweise eine innere Verstärkung aus einem Gewebeband oder einem Fadengelege aufweist, besteht.In a further development, the permeable band can be formed by a nonwoven, permeable band, which is coated at least on the side which touches the fibrous web. It is also conceivable that the permeable band consists of a plastic band which preferably has an internal reinforcement made of a fabric band or a thread band.

Das permeable Stützband ist vorzugsweise durch einen Filz gebildet. Dieser kann zumindest einen Teil des aus der Faserstoffbahn stammenden Wassers aufnehmen.The permeable support band is preferably formed by a felt. This can absorb at least a portion of the originating from the fibrous web water.

In praktischen Anordnungen kann das permeable Stützband auch durch ein Formiersieb gebildet sein.In practical arrangements, the permeable support band may also be formed by a forming fabric.

Zweckmäßigerweise sind in der Maschine drei oder mehr Lagenformierbereiche vorgesehen.Conveniently, three or more ply forming areas are provided in the machine.

Zur Verbesserung der Entwässerungsleistung der Entwässerungseinheit kann innerhalb der Schlaufe des Pressbandes oder des permeablen Bandes eine Haube vorgesehen sein. Der Haube wird das vorzugsweise heiße Fluid zugeführt. Vorteilhafterweise wird als heißes Fluid Luft und/oder Dampf eingesetzt. Die heiße Luft kann vorteilhafterweise aus der Abluft eines Trocknungsaggregates der Papiermaschine, wie beispielsweise der Haubenabluft eines Glättzylinders, stammen. Versuche haben gezeigt, dass durch die Entwässerungseinheit der Trockengehalt der Faserstoffbahn von beispielsweise 18% auf 40% gesteigert werden kann, während der Trockengehalt durch zwei Walzenpressen mit höherem Pressdruck auf lediglich 39% gesteigert werden konnte. Die Erfindung bringt neben der Steigerung der Qualität der Faserstoffbahn somit auch wirtschaftliche Vorteile.To improve the dewatering performance of the dewatering unit, a hood may be provided within the loop of the press belt or the permeable belt. The hood is supplied with the preferably hot fluid. Advantageously, the hot fluid used is air and / or steam. The hot air can advantageously come from the exhaust air of a drying unit of the paper machine, such as the hood exhaust air of a Glättzylinders. Tests have shown that the dewatering unit can increase the dry content of the fibrous web from, for example, 18% to 40%, while the dry content could be increased to only 39% by two roller presses with a higher pressing pressure. The invention thus brings in addition to the increase in the quality of the fibrous web thus also economic advantages.

Innerhalb der Haube kann ein Dampfblasrohr, vorzugsweise am Beginn der Presszone vorgesehen sein.Within the hood, a steam blow pipe, preferably be provided at the beginning of the press zone.

Die vorangehende Oberfläche wird vorzugsweise durch ein Formiersieb eines Lagenformierbereichs gebildet.The foregoing surface is preferably formed by a forming fabric of a sheet forming region.

In einer praktischen Ausführungsform ist der Entwässerungseinheit ein Pressspalt vorgelagert.In a practical embodiment, the dewatering unit is preceded by a press nip.

In einer weiteren praktischen Ausführungsform ist der Entwässerungseinheit ein, insbesondere doppelt befilzter, separat stehender Pressspalt vorgelagert.In a further practical embodiment, the dewatering unit is preceded by a, in particular double-felted, separately standing press nip.

In einer vorteilhaften Weiterentwicklung ist der Presszone der Entwässerungseinheit mindestens ein Pressspalt nachgeordnet.In an advantageous development of the press zone of the dewatering unit is arranged downstream of at least one press nip.

Zweckmäßigerweise ist die Faserstoffbahn beim Durchlaufen des mindestens einen, der Presszone der Entwässerungseinheit nachgeordneten Pressspaltes, zwischen dem permeablen Stützband und dem permeablen Band angeordnet.The fibrous web is expediently arranged between the permeable support band and the permeable band when passing through the at least one press nip arranged downstream of the press zone of the dewatering unit.

Vorzugsweise ist der der Presszone der Entwässerungseinheit nachgeordnete Pressspalt durch eine separat stehende Walzenpresse gebildet. Es ist möglich, dass dabei die Faserstoffbahn zwischen dem permeablen Stützband und dem permeablen Band angeordnet ist.Preferably, the press nip downstream of the press zone of the dewatering unit is formed by a stand-alone roll press. It is possible that in this case the fibrous web is arranged between the permeable support band and the permeable band.

In einer praktischen Ausgestaltung ist der der Presszone der Entwässerungseinheit nach geordnete Pressspalt durch eine in der Schlaufe des permeablen Bandes angeordneten Presswalze und dem Gegenelement der Entwässerungseinheit gebildet. Das Gegenelement ist vorzugsweise als Saugwalze ausgebildet. Es ist möglich, dass dabei die Faserstoffbahn zwischen dem permeablen Stützband und dem permeablen Band angeordnet ist.In a practical embodiment of the press zone of the dewatering unit is arranged according to ordered press nip by an arranged in the loop of the permeable belt press roll and the counter element of the dewatering unit. The counter element is preferably designed as a suction roll. It is possible that in this case the fibrous web is arranged between the permeable support band and the permeable band.

In einer weiteren Ausgestaltung ist der nachgeordnete Pressspalt als Saugpresse ausgeführt, bei der eine Presswalze als eine Saugpresswalze ausgeführt ist.In a further embodiment, the downstream press nip is designed as a suction press, in which a press roll is designed as a suction press roll.

In einer weiteren möglichen Ausführung ist mindestens ein der Presszone der Entwässerungseinheit nachgeordneter Pressspalt durch eine Presswalze und eine Glättwalze gebildet und einfach befilzt, wobei eine Seite der Faserstoffbahn mit der glatten Oberfläche der Glättwalze in Kontakt ist.In a further possible embodiment, at least one of the press zone of the dewatering unit downstream press nip is formed by a press roll and a smoothing roll and simply felted, wherein one side of the fibrous web is in contact with the smooth surface of the smoothing roll.

Es ist auch möglich, dass mindestens ein der Presszone der Entwässerungseinheit nachgeordneter Pressspalt durch zwei Glättwalzen gebildet ist, wobei beide Seiten der Faserstoffbahn mit der glatten Oberfläche der zugeordneten Glättwalze in Kontakt kommen.It is also possible that at least one of the press zone of the dewatering unit downstream press nip is formed by two smoothing rolls, both sides of the fibrous web come into contact with the smooth surface of the associated smoothing roll.

Vorteilhafterweise folgen nach dem Pressbereich Trocknungsvorrichtungen und eine Aufwickeleinheit. Zwischen den Trocknungsvorrichtungen und/oder nach den Trocknungsvorrichtungen ist mindestens ein Streichaggregat zum zumindest einseitigen Auftragen von Streichmedium auf die Faserstoffbahn vorgesehen. Das Streichmedium kann aus pigmentierter Streichfarbe, Stärke und/oder aus Leim bestehen.Advantageously, drying devices and a winding unit follow after the pressing area. Between the drying devices and / or after the drying devices is at least one coating unit for at least one-sided application of coating medium provided on the fibrous web. The coating medium may consist of pigmented coating color, starch and / or glue.

Vorzugsweise wird die Seite der Faserstoffbahn mit der höheren Glätte gestrichen.Preferably, the side of the higher smoothness fibrous web is painted.

In einer praktischen Weiterentwicklung können zwei oder mehr Faserstoffbahnlagen in einem Lagenformierbereich gebildet sein. Hierfür wird ein Mehrschichtstoffäuflauf eingesetzt, der mit unterschiedlichen Stoffsuspensionen gespeist wird. Diese werden bis zum Verlassen des Stoffauflaufes getrennt geführt und in einem Lagenformierbereich entwässert. Die Trennung erfolgt durch Lamellen in der Stoffauflaufdüse.In a practical further development, two or more fibrous web layers may be formed in a layer forming region. For this purpose, a multi-layer material flow is used, which is fed with different stock suspensions. These are separated until they leave the headbox and drained in a Lagenformierbereich. The separation takes place through lamellae in the headbox nozzle.

Die Aufgabe wird auch durch ein Verfahren zur Herstellung einer mehrlagigen Faserstoffbahn, nach Anspruch 13 gelöst.The object is also achieved by a method for producing a multilayer fibrous web, according to claim 13.

Die Maschine zur Herstellung von Karton findet vorzugsweise Verwendung für die Herstellung von Faltschachtelkarton.The paperboard machine is preferably used for the manufacture of cartonboard.

Die erfindungsgemäße Maschine ist besonders für die Herstellung von Faserstoffbahnen mit einem Flächengewicht von insbesondere mehr als 60 g/m2 geeignet.The machine according to the invention is particularly suitable for the production of fibrous webs having a basis weight of more than 60 g / m 2 in particular.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele unter Bezugnahme auf die Zeichnungen.Further features and advantages of the invention will become apparent from the following description of preferred embodiments with reference to the drawings.

Es zeigen

Figur 1
einen Ausschnitt einer ersten Ausführungsform einer erfindungsgemäßen Maschine, wobei die Entwässerungs-einheit im Pressbereich angeordnet ist.
Figur 2
einen Ausschnitt einer zweiten Ausführungsform einer erfindungsgemäßen Maschine, wobei die Entwässerungs-einheit im Pressbereich angeordnet ist.
Figur 3
einen Ausschnitt einer dritten Ausführungsform einer erfindungsgemäßen Maschine, wobei die Entwässerungs-einheit im Pressbereich angeordnet ist.
Figur 4
einen Ausschnitt einer vierten Ausführungsform einer erfindungsgemäßen Maschine, wobei die Entwässerungs-einheit im Pressbereich angeordnet ist.
Figur 5
einen Ausschnitt einer fünften Ausführungsform einer erfindungsgemäßen Maschine, wobei die Entwässerungs-einheit im Pressbereich angeordnet ist.
Figur 6
einen Ausschnitt einer sechsten Ausführungsform einer erfindungsgemäßen Maschine, wobei die Entwässerungs-einheit im Pressbereich angeordnet ist.
Figur 7
einen Ausschnitt einer siebten Ausführungsform einer erfindungsgemäßen Maschine, wobei die Entwässerungs-einheit im Pressbereich angeordnet ist.
Figur 8
einen Ausschnitt einer weiteren Ausführungsform einer erfindungsgemäßen Maschine, wobei die Entwässerungs-einheit im Pressbereich angeordnet ist.
Figur 9
einen Ausschnitt einer weiteren Ausführungsform einer Maschine, wobei die Entwässerungs-einheit im Formierbereich angeordnet ist, die nicht unter den Schutzumfang der Ansprüche fällt.
Figur 10
einen Ausschnitt einer weiteren Ausführungsform einer Maschine, wobei die Entwässerungs-einheit im Formierbereich angeordnet ist, die nicht unter den Schutzumfang der Ansprüche fällt.
Figur 11
einen Ausschnitt einer weiteren Ausführungsform einer Maschine, wobei die Entwässerungs-einheit im Formierbereich angeordnet ist, die nicht unter den Schutzumfang der Ansprüche fällt. .
Show it
FIG. 1
a detail of a first embodiment of a machine according to the invention, wherein the dewatering unit is arranged in the pressing area.
FIG. 2
a section of a second embodiment of a machine according to the invention, wherein the dewatering unit is arranged in the pressing area.
FIG. 3
a detail of a third embodiment of a machine according to the invention, wherein the dewatering unit is arranged in the pressing area.
FIG. 4
a section of a fourth embodiment of a machine according to the invention, wherein the dewatering unit is arranged in the pressing area.
FIG. 5
a detail of a fifth embodiment of a machine according to the invention, wherein the dewatering unit is arranged in the pressing area.
FIG. 6
a section of a sixth embodiment of a machine according to the invention, wherein the dewatering unit is arranged in the pressing area.
FIG. 7
a section of a seventh embodiment of a machine according to the invention, wherein the dewatering unit is arranged in the pressing area.
FIG. 8
a detail of another embodiment of a machine according to the invention, wherein the dewatering unit is arranged in the pressing area.
FIG. 9
a section of another embodiment of a machine, wherein the dewatering unit is arranged in the forming region, which does not fall under the scope of the claims.
FIG. 10
a section of another embodiment of a machine, wherein the dewatering unit is arranged in the forming region, which does not fall under the scope of the claims.
FIG. 11
a section of another embodiment of a machine, wherein the dewatering unit is arranged in the forming region, which does not fall under the scope of the claims. ,

Die Figur 1 zeigt einen Ausschnitt einer ersten Ausführungsform einer erfindungsgemäßen Maschine 1. Die Entwässerungseinheit E ist im Pressbereich der Maschine 1 angeordnet. Der Pressbereich ist durch ein permeables Pressband 5 und eine Saugwalze 7 gebildet. Die Faserstoffbahn 2 wird durch das permeable Stützband 3, welches in diesem Beispiel als Filz ausgeführt ist, mittels einer Saugwalze von der Oberfläche der vorausgehenden Bespannung, das heißt des Formiersiebes 6 abgenommen und durch die Presszone zwischen dem Filz 3 und dem permeablen Band 4 liegend, geführt. In der Presszone wird die Faserstoffbahn 2 infolge der Spannung des permeablen Pressbandes 5 mechanisch gepresst und gleichzeitig von heißer Luft durchströmt. Die heiße Luft stammt aus der Abluft eines Trocknungsaggregates der Papiermaschine, wie beispielsweise der Haubenabluft eines Glättzylinders und gelangt über die Haube 9 über die Faserstoffbahn 2 in die Saugzone 10 der Saugwalze 7. Dadurch werden Wärmeverluste im Herstellungsprozess reduziert. In diesem Beispiel wird die Faserstoffbahn 2 in Laufrichtung auf der gesamten Länge der Presszone von heißer Luft durchströmt. Am Beginn der Presszone ist ein Dampfblasrohr 8 installiert. Der Dampf strömt infolge der Druckdifferenz zwischen der Saugzone 10 und der Haube 9 nacheinander zusätzlich durch das permeable Pressband 5, das permeable Band 4, die Faserstoffbahn 2 und durch den Filz in die Saugzone 10 der Saugwalze 7. Dadurch wird die Faserstoffbahn 2 erwärmt und die Entwässerung begünstigt. Das permeable Band 4 ist als Filz oder Sieb ausgeführt. Nach Durchlaufen der Presszone wird die Faserstoffbahn 2 durch einen der Entwässerungseinheit E nachgeordneten Pressspalt geführt, welcher durch die Presswalze 15 und die Presswalze 16 gebildet ist. Die Presswalze 15 liegt dabei in der Schlaufe des permeablen Bandes 4 und die Presswalze 16 liegt in der Schlaufe des permeablen Stützbandes 3. Diese Anordnung zeichnet sich durch die Wirtschaftlichkeit aus, da für den Pressspalt keine zusätzlichen Bespannungen benötigt werden. Anschließend wird die Faserstoffbahn 2 über einen freien Zug durch einen weiteren Pressspalt geführt. Dieser wird durch eine Glättwalze 11 und einer Presswalze 12 gebildet. Die Glättwalze 11 ist der Oberseite der Faserstoffbahn 2 zugeordnet. Die Oberseite der Faserstoffbahn 2 wird somit geglättet. Im weiteren Verlauf des Herstellungsprozesses folgt eine Streichauftragseinrichtung, welche auf die geglättete Seite der Faserstoffbahn 2 einen Pigmentstrich aufträgt. Diese Anordnung verbessert die Oberflächenqualität der Faserstoffbahn 2 hinsichtlich der weiteren Verarbeitungseigenschaft, wie beispielsweise Bedruckbarkeit. Bei der Produktion von Faltschachtelkarton bildet bei dieser Anordnung die obere Lage der Faserstoffbahn die sogenannte Deckenlage.The FIG. 1 shows a section of a first embodiment of a machine 1 according to the invention. The dewatering unit E is arranged in the pressing region of the machine 1. The pressing area is formed by a permeable pressing belt 5 and a suction roller 7. The fibrous web 2 is removed by means of the permeable support belt 3, which in this example is felt, by means of a suction roll from the surface of the preceding fabric, that is to say the forming fabric 6 and lying between the felt 3 and the permeable belt 4 through the press zone, guided. In the press zone, the fibrous web 2 is mechanically pressed due to the tension of the permeable press belt 5 and simultaneously flows through hot air. The hot air comes from the exhaust air of a drying unit of the paper machine, such as the hood exhaust air of a Glättzylinders and passes through the hood 9 via the fibrous web 2 in the suction zone 10 of the suction roller 7. This heat losses are reduced in the manufacturing process. In this example, the fibrous web 2 is traversed in the running direction over the entire length of the pressing zone of hot air. At the beginning of the press zone, a steam blow pipe 8 is installed. The steam flows due to the pressure difference between the suction zone 10 and the hood 9 successively in addition by the permeable press belt 5, the permeable belt 4, the fibrous web 2 and through the felt in the suction zone 10 of the suction roller 7. Thus, the fibrous web 2 is heated and the Drainage favors. The permeable belt 4 is designed as felt or sieve. After passing through the press zone, the fibrous web 2 is passed through a downstream of the dewatering unit E press nip, which by the press roller 15 and the press roller 16 are formed. The pressure roller 15 lies in the loop of the permeable belt 4 and the pressure roller 16 is in the loop of the permeable support belt 3. This arrangement is characterized by the economy, since no additional clothing is required for the press nip. Subsequently, the fibrous web 2 is passed over a free train through another press nip. This is formed by a smoothing roll 11 and a press roll 12. The smoothing roll 11 is assigned to the upper side of the fibrous web 2. The top of the fibrous web 2 is thus smoothed. In the further course of the production process follows a coating application device which applies a pigment coating to the smoothed side of the fibrous web 2. This arrangement improves the surface quality of the fibrous web 2 in terms of further processing property, such as printability. In the production of folding carton forms in this arrangement, the upper layer of the fibrous web, the so-called ceiling layer.

Die in der Figur 2 dargestellte Ausführung unterscheidet sich von der Figur 1 durch die Gestaltung des der Entwässerungseinheit E nachgeordneten Pressspaltes. Die obere Presswalze 16 ist wiederum in der Schlaufe des Stützbandes 3 angeordnet, während die untere Presswalze 15 außerhalb der Schlaufe des permeablen Bandes 4 angeordnet ist und in direktem Kontakt mit der Unterseite der Faserstoffbahn 2 steht. Diese Ausführung glättet auch die Unterseite.The in the FIG. 2 illustrated embodiment is different from the FIG. 1 by the design of the downstream of the dewatering unit E press nip. The upper pressure roller 16 is again arranged in the loop of the support belt 3, while the lower pressure roller 15 is disposed outside the loop of the permeable belt 4 and is in direct contact with the underside of the fibrous web 2. This design also smoothes the bottom.

Die Ausführung in der Figur 3 zeigt eine weitere Variante des der Entwässerungseinheit E nachgeordneten Pressspaltes. Der Pressspalt wird durch eine in der Schlaufe des permeablen Bandes 4 liegenden Presswalze 17 und der Saugwalze 7 der Entwässerungseinheit E gebildet. Die Saugwalze 7 weist im Bereich des Pressspaltes zur Steigerung des Trockengehaltes der Faserstoffbahn 2 eine weitere Saugzone 10.1 auf. Diese Saugzone 10.1 ist vorzugsweise unabhängig von der Saugzone 10 besaugt. Die Presswalze 17 wird vom permeablen Band und vom permeablen Stützband teilweise gemeinsam umschlungen. Danach wird das permeable Stützband 3 von der Faserstoffbahn 2 getrennt, welche auf dem permeablen Band liegend über ein Saugelement 18 geführt wird. Der Pressfilz 13.1 nimmt die Faserstoffbahn 2 vom permeablen Band 4 mittels einer Saugwalze ab und führt sie durch einen nachgeordneten Glättspalt, der durch die Presswalze 12 und der Glättwalze 11 gebildet wird. Dabei berührt die Glättwalze 11 die Unterseite der Faserstoffbahn 2 so, dass sie geglättet wird. Diese Ausführung weist eine günstige Bahnführung zur horizontalen Weiterführung der Faserstoffbahn auf.The execution in the FIG. 3 shows a further variant of the dewatering unit E downstream press nip. The press nip is formed by a pressure roller 17 located in the loop of the permeable belt 4 and the suction roller 7 of the dewatering unit E. The suction roller 7 has in the region of the press nip to increase the dry content of the fibrous web 2, a further suction zone 10.1. This suction zone 10.1 is preferably evacuated independently of the suction zone 10. The press roll 17 is partially wrapped in common by the permeable band and the permeable support band. Thereafter, the permeable support belt 3 is separated from the fibrous web 2, which is guided on the permeable belt over a suction element 18. The press felt 13.1 takes the fibrous web 2 from the permeable belt 4 by means of a suction roll and guides them through a downstream smoothing nip formed by the press roll 12 and the smoothing roll 11. The smoothing roll 11 touches the bottom of the fibrous web 2 so that it is smoothed. This design has a convenient web guide for the horizontal continuation of the fibrous web.

In der Anordnung der Figur 4 wird die Faserstoffbahn 2, im Gegensatz zu den bisherigen Ausführungsvarianten, durch das permeable Band 4 mittels einer Saugwalze von der Oberfläche der vorausgehenden Bespannung 6 abgenommen und durch die Presszone geführt.In the arrangement of FIG. 4 the fibrous web 2, in contrast to the previous embodiments, removed by the permeable belt 4 by means of a suction roll from the surface of the preceding fabric 6 and passed through the press zone.

Die Figur 5 zeigt die gespiegelte Entwässerungseinheit E der Figur 3. Die Anordnungen unterscheiden sich lediglich dadurch, dass die Faserstoffbahn 2 durch das permeable Band 4 mittels einer Saugwalze von der Oberfläche der vorausgehenden Bespannung 6 abgenommen und durch die Presszone geführt wird. In dem nachfolgenden Glättspalt wird die Unterseite der Faserstoffbahn 2 geglättet. Das permeable Band 4 kann als Filz oder Sieb ausgeführt sein. Das permeable Stützband 3 wird durch einen Filz gebildet. Der nach geordnete Pressspalt und Glättspalt ist entsprechend bei der Figur 3 beschrieben.The FIG. 5 shows the mirrored drainage unit E of FIG. 3 , The arrangements differ only in that the fibrous web 2 is removed by the permeable belt 4 by means of a suction roll from the surface of the preceding fabric 6 and passed through the press zone. In the subsequent smoothing gap, the underside of the fibrous web 2 is smoothed. The permeable belt 4 can be designed as felt or sieve. The permeable support band 3 is formed by a felt. The orderly press nip and smoothing gap is corresponding to the FIG. 3 described.

In der Variante der Figur 6 unterscheidet sich von der in der Figur 5 beschriebenen Anordnung dadurch, dass der nach geordnete Pressspalt ein separater, d.h. einzeln stehender Pressspalt ist, der durch die Presswalzen 15 und 16 gebildet ist.In the variant of FIG. 6 is different from the one in the FIG. 5 described arrangement in that the after-ordered press nip is a separate, ie stand-alone press nip, which is formed by the press rollers 15 and 16.

Die in den Figuren 7 und 8 dargestellten Anordnungen der Entwässerungseinheit E entsprechen den Anordnungen der Figuren 3 und 5. Die Beschreibung gilt daher entsprechend für die Figuren 7 und 8. Der Unterschied besteht darin, dass der Entwässerungseinheit E ein separater, d.h. ein einzeln stehender Pressspalt, der jeweils durch die Presswalzen 20 und 21 gebildet wird, vorgeschaltet ist. Dabei ist jeweils die untere Presswalze 21 als Saugpresswalze ausgeführt. Die Bespannungen 19 und 19.1 sind als Filze ausgebildet. Durch diese Anordnungen können große Wassermengen entwässert werden. Die Faserstoffbahn 2 wird im Falle der Figur 7 durch das permeable Stützband 3, welches in diesem Beispiel als Filz ausgeführt ist, und im Falle der Figur 8 durch das permeable Band 4, welches in diesem Beispiel als Sieb ausgeführt ist, mittels einer Saugwalze von der Oberfläche der vorausgehenden Bespannung 19.1 abgenommen und durch die Presszone zwischen dem Filz 3 und dem permeablen Band 4 liegend, geführt.The in the FIGS. 7 and 8th shown arrangements of the dewatering unit E correspond to the arrangements of Figures 3 and 5 , The description therefore applies accordingly to the FIGS. 7 and 8th , The difference is that the drainage unit E is preceded by a separate, ie a stand-alone press nip, which is respectively formed by the press rolls 20 and 21. In each case, the lower press roller 21 is designed as a suction press roll. The fabrics 19 and 19.1 are formed as felts. By these arrangements, large amounts of water can be dewatered. The fibrous web 2 is in the case of FIG. 7 by the permeable support band 3, which is designed in this example as felt, and in the case of FIG. 8 through the permeable belt 4, which in this example is designed as a sieve, removed by means of a suction roller from the surface of the preceding clothing 19.1 and lying through the press zone between the felt 3 and the permeable belt 4, out.

In den folgenden Figuren 9, 10, 11, wobei es sich bei diesen Ausführungsbeispielen nicht um einen Teil der Erfindung handelt, ist die Entwässerungseinheit E im Formierbereich der Maschine 1 angeordnet. In der Anordnung der Figur 9 bildet das Formiersieb 6 das permeable Stützband der Entwässerungseinheit E. Das permeable Band kann bei dieser Variante als Filz oder als Sieb ausgeführt sein. Die mehrlagige Faserstoffbahn 2 wird direkt durch den Filz einer nachfolgenden Maschinensektion vom Formiersieb 6 abgenommen. Die Funktionsweise der Entwässerungseinheit E ist analog den vorangegangenen Beschreibungen.In the following Figures 9 . 10 . 11 Although these embodiments are not part of the invention, the dewatering unit E is arranged in the forming area of the machine 1. In the arrangement of FIG. 9 the forming fabric 6 forms the permeable support band of the dewatering unit E. In this variant, the permeable band can be embodied as a felt or as a sieve. The multilayer fibrous web 2 is removed directly from the forming fabric 6 by the felt of a subsequent machine section. The operation of the dewatering unit E is analogous to the previous descriptions.

Die in der Figur 10 dargestellten Variante ist die Entwässerungseinheit in einen Lagenformierbereich so integriert, dass das Formiersieb 6.1 das permeable Band bildet. Der Stoffauflauf 22 kann mehrschichtig ausgeführt sein, sodass mehrere Faserstoffbahnlagen auf einem Formiersieb 6.1 gebildet werden. Die so gebildete Faserstoffbahn 2 kann, wie dargestellt direkt zum nachgeordenten Glättspalt geführt werden, oder mit einer Faserstoffbahnlage eines anderen Lagenformierbereichs zusammengegautscht werden und danach zum nachgeordenten Glättspalt geführt werden. Die Presswalze 15.1 ist als Schuhpresswalze ausgeführt. Die Presswalzen 16 und 15.1 bilden somit einen Langspalt aus. In einer speziellen Ausgestaltung ist das Formiersieb 6.1 als Filz ausgeführt. Dies ist besonders für leichtere Flächengewichte von Vorteil.The in the FIG. 10 In the variant shown, the dewatering unit is integrated into a layer forming area such that the forming fabric 6.1 forms the permeable band. The headbox 22 may be multi-layered, so that several fibrous web layers are formed on a Formiersieb 6.1. The thus formed fibrous web 2 can, as shown, be guided directly to the downstream smoothing nip, or be pored together with a fibrous web ply of another ply forming region and then guided to the downstream smoothing nip. The press roller 15.1 is designed as a shoe press roll. The press rollers 16 and 15.1 thus form an extended nip. In a special embodiment, the forming fabric 6.1 is designed as felt. This is particularly advantageous for lighter basis weights.

Die Figur 11 zeigt einen Formierbereich IV mit drei Lagenformierbereiche I, II, III. Die Entwässerungseinheit E ist im Lagenformierbereich I angeordnet, der die mittlere, d.h. eine innere Lage der Faserstoffbahn 2 bildet. Die Funktionsweise der Entwässerungseinheit E ist entsprechend der Beschreibung der Variante der Figur 9. Allerdings wird die gebildete Faserstoffbahnlage nicht an eine nachgeordnete Maschinensektion übergeben, sondern zuerst mit der auf dem Lagenformierbereich II gebildeten Faserstoffbahnlage und anschließend mit der auf dem Lagenformierbereich III gebildeten Faserstoffbahnlage zusammengegautscht. Der Lagenformierbereich I wird aus einem Langsieb 6.1 mit aufgesetztem Doppelsiebformierteil 23 und einem Stoffauflauf 22.1 gebildet. Die Lagenformierbereiche II und III sind als Langsiebe 6.2 und 6.3 mit den Stoffaufläufen 22.2 und 22.3 ausgeführt.The FIG. 11 shows a forming region IV with three Lagenformierbereiche I, II, III. The dewatering unit E is arranged in the layer forming region I, which forms the middle, ie an inner layer of the fibrous web 2. The operation of the drainage unit E is according to the description of the variant of FIG. 9 , However, the fibrous web layer formed is not transferred to a downstream machine section, but first with the on the Lagenformierbereich II formed fibrous web layer and then zusammengegautscht with the formed on the Lagenformierbereich III fibrous web layer. The Lagenformierbereich I is formed from a fourdrinier screen 6.1 with attached Doppelsiebformierteil 23 and a headbox 22.1. The Lagenformierbereiche II and III are designed as a long sieves 6.2 and 6.3 with the headboxes 22.2 and 22.3.

Die allgemeinen Beschreibungen der Funktionsweise der Entwässerungseinheit E und der sich wiederholenden Elemente für die unterschiedlichen Ausführungen sind zwischen den entsprechenden Ausführungen übertragbar.The general descriptions of the operation of the drainage unit E and the repetitive elements for the different embodiments are transferable between the corresponding embodiments.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Maschinemachine
22
FaserstoffbahnFibrous web
33
permeables Stützbandpermeable support band
44
permeables Bandpermeable band
4.14.1
permeables Bandpermeable band
55
Presselement, PressbandPressing element, press belt
66
Formiersiebforming fabric
6.16.1
Formiersieb einer FaserstoffbahnlageForming screen of a fibrous web layer
6.26.2
Formiersieb einer FaserstoffbahnlageForming screen of a fibrous web layer
6.36.3
Formiersieb einer FaserstoffbahnlageForming screen of a fibrous web layer
77
Gegenelement, SaugwalzeCounter element, suction roller
88th
Dampfblasrohrsteam blowpipe
99
HaubeHood
1010
Saugzonesuction zone
10.110.1
Saugzonesuction zone
1111
Glättwalzesmoothing roll
1212
Presswalzepress roll
1313
Pressfilz, BandPress felt, band
13.113.1
Pressfilz, BandPress felt, band
1414
pick up-Stellepick up place
14.114.1
pick up-Stellepick up place
1515
Presswalzepress roll
15.115.1
SchuhpresswalzeShoe press roll
1616
Presswalzepress roll
1717
Presswalzepress roll
1818
Saugelementsuction
1919
Pressfilzpress felt
19.119.1
Pressfilzpress felt
2020
Presswalzepress roll
2121
Presswalzepress roll
2222
Stoffauflaufheadbox
22.122.1
Stoffauflaufheadbox
22.222.2
Stoffauflaufheadbox
22.322.3
Stoffauflaufheadbox
2323
DoppelsiebformierteilDoppelsiebformierteil
II
LagenformierbereichLagenformierbereich
IIII
LagenformierbereichLagenformierbereich
IIIIII
LagenformierbereichLagenformierbereich
IVIV
Formierbereichforming region
Ee
Entwässerungseinheitdewatering unit

Claims (14)

  1. Machine (1) for producing a multilayer fibrous web (2), in particular a board web having a grammage of more than 40 g/m2, having a forming area (IV) for forming the multilayer fibrous web (2), comprising at least two layer forming areas (I, II, III) for forming the fibrous web layers, and having a pressing area following the forming area (IV),
    characterized in that
    a dewatering unit (E) having a pressing zone, through which the fibrous web (2) is led lying between a circulating, permeable belt (4) and a circulating, permeable supporting belt (3), is provided for the dewatering, the pressing zone being formed in such a way that a fluid can flow through the permeable belt (4), the fibrous web (2) and the permeable supporting belt (3), at least over part of the length of the pressing zone, the pressing zone being formed by a permeable pressing element (5) and a permeable mating element (7), and in that the dewatering unit (E) is arranged in the pressing area such that the fibrous web (2) is picked up from a preceding surface by the permeable belt (4) or by the permeable supporting belt (3) and is led through the pressing zone.
  2. Machine according to Claim 1,
    characterized in that
    the mating element (7) consists of a roll or a box with a curved or flat contact face.
  3. Machine according to Claim 1 or 2,
    characterized in that
    the permeable pressing element (5) comprises a press belt and/or a press shoe.
  4. Machine according to Claim 3,
    characterized in that
    the press belt (5) consists of a screen fabric, spiral screen, metal screen, perforated metal belt or a belt made of composite material.
  5. Machine according to one of the preceding claims,
    characterized in that
    the permeable belt (4) has a structured surface for structuring the fibrous web (2) and/or at least one fibrous web layer.
  6. Machine according to one of the preceding claims,
    characterized in that
    three or more layer forming areas (I, II, III) are provided.
  7. Machine according to one of the preceding claims,
    characterized in that
    a press nip, in particular a double-felted, separate press nip, is placed upstream of the dewatering unit (E).
  8. Machine according to one of the preceding claims,
    characterized in that
    at least one press nip is arranged downstream of the pressing zone of the dewatering unit (E).
  9. Machine according to Claim 8,
    characterized in that
    the fibrous web (2) is arranged between the permeable supporting belt (3) and the permeable belt (4) as it passes through the at least one press nip.
  10. Machine according to Claim 8,
    characterized in that
    the at least one press nip is formed by a press roll (12) and a smoothing roll (11) and is single-felted, one side of the fibrous web (2) being in contact with the smooth surface of the smoothing roll (11).
  11. Machine according to Claim 8,
    characterized in that
    the at least one press nip is formed by two smoothing rolls, both sides of the fibrous web (2) coming into contact with the smooth surface of the associated smoothing roll.
  12. Machine according to one of the preceding claims,
    characterized in that
    drying devices follow after the pressing area, and in that, between the drying devices and/or after the drying devices, at least one coating unit is provided for the at least one-sided application of coating medium to the fibrous web (2).
  13. Method for producing a multilayer fibrous web (2), in particular a board web having a grammage of more than 40 g/m2, in which the fibrous web (2) is formed from at least two fibrous web layers, the fibrous web layers being produced in a forming area (IV) comprising at least two layer forming areas (I, II, III) and being further dewatered in a pressing area following the forming area (IV),
    characterized in that
    in the pressing area, use is made of a dewatering unit (E) having a pressing zone, through which the fibrous web (2) is led lying between a circulating, permeable belt (4) and a circulating, permeable supporting belt (3), the pressing zone being formed in such a way that a fluid flows through the permeable belt (4), the fibrous web (2) and the permeable supporting belt (3), at least over part of the length of the pressing zone, and the pressing zone is formed by a permeable pressing element (5) and a permeable mating element (7), in the pressing zone the fibrous web (2) being pressed mechanically and at the same time a fluid flowing through the same.
  14. Use of the machine (1) according to Claim 1 for producing board, in particular folding boxboard.
EP11773254.5A 2010-11-17 2011-10-21 Device and method for producing a material web Not-in-force EP2640890B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13198087.2A EP2712958B1 (en) 2010-11-17 2011-10-21 Device and method for producing a material web

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010044079 DE102010044079A1 (en) 2010-11-17 2010-11-17 Apparatus and method for producing a material web
PCT/EP2011/068403 WO2012065804A1 (en) 2010-11-17 2011-10-21 Device and method for producing a material web

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP13198087.2A Division-Into EP2712958B1 (en) 2010-11-17 2011-10-21 Device and method for producing a material web
EP13198087.2A Division EP2712958B1 (en) 2010-11-17 2011-10-21 Device and method for producing a material web

Publications (2)

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EP2640890A1 EP2640890A1 (en) 2013-09-25
EP2640890B1 true EP2640890B1 (en) 2015-09-23

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EP11773254.5A Not-in-force EP2640890B1 (en) 2010-11-17 2011-10-21 Device and method for producing a material web

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CN (1) CN103328723A (en)
DE (1) DE102010044079A1 (en)
WO (1) WO2012065804A1 (en)

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EP3017104B1 (en) * 2013-07-04 2020-03-04 Voith Patent GmbH Method for retrofitting and operating a device for producing a non-woven fabric
WO2015000690A1 (en) * 2013-07-04 2015-01-08 Voith Patent Gmbh Method and compact device for producing non-woven fabric
EP3212843B1 (en) * 2014-10-29 2018-07-18 Voith Patent GmbH Device for dewatering a fiber web
CN105735026B (en) * 2014-12-11 2019-08-09 福伊特专利有限公司 For manufacturing the machine of fibrous material web
DE102022133436A1 (en) 2022-12-15 2024-06-20 Voith Patent Gmbh Device for producing a fibrous web and corresponding manufacturing process

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US20100193149A1 (en) * 2008-07-03 2010-08-05 Quigley Scott D Structured forming fabric, papermaking machine and method

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US4879001A (en) * 1988-09-12 1989-11-07 Beloit Corporation Twin wire former with roll press followed by extended nip press
US7416637B2 (en) * 2004-07-01 2008-08-26 Georgia-Pacific Consumer Products Lp Low compaction, pneumatic dewatering process for producing absorbent sheet
DE102005052092A1 (en) 2005-10-28 2007-05-03 Voith Patent Gmbh Apparatus and method for treating a fibrous web, in particular a cardboard or paper web
DE102008000226A1 (en) * 2008-02-04 2009-08-06 Voith Patent Gmbh Device for dewatering fibrous webs, in particular tissue webs
FI121147B (en) * 2008-06-27 2010-07-30 Metso Paper Inc Pre-press, web forming part and plant for manufacturing multi-layer web
DE102008054990A1 (en) * 2008-12-19 2010-06-24 Voith Patent Gmbh Apparatus and method for producing a material web
DE102010029582A1 (en) * 2010-06-01 2011-12-01 Voith Patent Gmbh Wet end of a machine for the production of fibrous webs and use of such a wet end

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US20100193149A1 (en) * 2008-07-03 2010-08-05 Quigley Scott D Structured forming fabric, papermaking machine and method

Also Published As

Publication number Publication date
EP2640890A1 (en) 2013-09-25
WO2012065804A1 (en) 2012-05-24
EP2712958A1 (en) 2014-04-02
EP2712958B1 (en) 2016-04-13
CN103328723A (en) 2013-09-25
DE102010044079A1 (en) 2012-05-24

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