EP3212843B1 - Device for dewatering a fiber web - Google Patents

Device for dewatering a fiber web Download PDF

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Publication number
EP3212843B1
EP3212843B1 EP15777659.2A EP15777659A EP3212843B1 EP 3212843 B1 EP3212843 B1 EP 3212843B1 EP 15777659 A EP15777659 A EP 15777659A EP 3212843 B1 EP3212843 B1 EP 3212843B1
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EP
European Patent Office
Prior art keywords
press
belt
zone
fibrous web
fibre web
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Application number
EP15777659.2A
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German (de)
French (fr)
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EP3212843A1 (en
Inventor
Thomas Scherb
Luiz Carlos Silva
Hubert Walkenhaus
Joachim Henssler
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP3212843A1 publication Critical patent/EP3212843A1/en
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    • 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
    • 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
    • D21F3/0209—Wet presses with extended press nip
    • 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
    • D21F11/006—Making patterned paper
    • 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
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • 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
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • D21F11/145—Making cellulose wadding, filter or blotting paper including a through-drying process
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/18—Drying webs by hot air
    • D21F5/182—Drying webs by hot air through perforated cylinders

Definitions

  • the present invention relates to a device for dewatering a fibrous web, in particular a paper, board or tissue web, with a belt press comprising a web-extended nip between a permeable press belt and an at least partially looped by the press belt curved surface of a counter element is formed, wherein the fibrous web is guided together with a permeable carrier tape through the press nip of the belt press and means are provided to pressurize at least a portion of the press nip the belt press so that it flows through the carrier belt and the fibrous web, wherein the Fluidbeaufyerungsffen comprise a blowing device which is arranged so that the fluid flows from the curved surface of the counter element of the belt press to the press belt of the belt press.
  • the document EP 1 852 551 A1 discloses a dewatering apparatus for dewatering a paper, tissue or other fibrous web in a machine for making or finishing the same.
  • the fibrous web is guided lying between two bands on a blow roll, which directs blown air in the wrap to the fibrous web.
  • the document DE 103 03 959 A1 describes a displacement dewatering press for dewatering a fibrous web.
  • the fibrous web will be there also guided lying between two bands on a blower roll, which directs blown air in the wrap to the fibrous web.
  • the dewatering takes place with simultaneous application of gas pressure and mechanical pressure to displace the water in the fibrous web.
  • the fibrous web in the forming zone is dewatered through a forming wire by means of applied centrifugal forces to a solids content of about 12%, whereupon the fibrous web is further dehydrated by vacuum to a solids content of about 23% and mechanically from a solids content of about 23% to about 40%.
  • the fibrous web is highly compressed, which adversely affects their thickness, volume and water absorbency.
  • a dry content limit of 23% more or less represents the maximum dry content value in the dry content vacuum curve that can be achieved by dewatering a tissue web on a wet felt.
  • the provision of a larger vacuum capacity is not energy efficient.
  • the invention has for its object to provide an improved device of the type mentioned above, with the lowest possible energy consumption while avoiding unwanted excessive compression of the fibrous web reach a higher dry content of the fibrous web immediately after the belt press and thus in particular also for the production of a voluminous Tissuebahn can be used.
  • the press belt of the belt press has a thickness ⁇ 4 mm, in particular ⁇ 2.8 mm, and preferably ⁇ 1.9 mm.
  • the fluid loading means of the device comprise a blowing device, which is arranged and designed so that the fluid, starting from the curved surface of the counter element of the belt press flows towards the press belt of the belt press.
  • the fluid thus flows in the direction of the force acting on the fibrous web due to the curved surface of the counter-element centrifugal force. This not only results in a reduction in the energy requirement required for fluid application, but also higher web speeds are possible, since unlike a conventional vacuum on the side of the counter element not the first centrifugal force must be compensated to achieve a corresponding dewatering effect.
  • the fluid flow according to the invention acts in the direction of the force acting on the fibrous web centrifugal force and consequently the dewatering of the fibrous web in the press nip of the belt press is also supported by the centrifugal force, can be achieved at low energy consumption correspondingly higher dry contents of the fibrous web immediately after the belt press, which is particularly advantageous if the fibrous web is subsequently to be fed to a downstream of the belt press drying zone.
  • the blowing device may in particular comprise a blow box assigned to the counter element of the belt press.
  • the fibrous web is guided lying between the carrier tape and the press belt lying through the press nip of the belt press.
  • the fibrous web guided together with the carrier belt through the press nip of the belt press contacts the press belt and the carrier belt the counter element of the belt press. In the present case, therefore, only the carrier tape with the fibrous web is passed through the press nip of the belt press.
  • the fluid acting on at least a portion of the press nips of the belt press advantageously contains hot, moist air and / or steam.
  • the device is designed to form a structured fibrous web and provided as a carrier tape, a structured band.
  • a corresponding device is particularly suitable for producing a voluminous tissue web.
  • the fibrous web is preferably passed together with the carrier tape from a forming zone of the device to the belt press and through it.
  • the device may in particular comprise a forming zone in which the fibrous web is formed on the preferably structured carrier tape.
  • the belt press is also preferably arranged downstream of a drying zone, which is fed to the fibrous web together with the carrier tape.
  • a drying zone expediently has a drying cylinder, in particular Yankee cylinder, and preferably a hood associated with the drying cylinder.
  • the drying cylinder for forming a further pressing zone associated with a counter-element which advantageously comprises a shoe pressing element, in particular shoe press roll, a counter-element with associated suction device, in particular suction roll, or a conventional press roll.
  • the fibrous web is transferred in the region of the further press zone of the carrier tape to the drying cylinder and continued on this.
  • the press belt of the belt press is designed for the highest possible tensile stress and preferably for a tensile stress ⁇ 30 kN / m.
  • a tensile stress in the range from about 10 kN / m to about 30 kN / m acts on the press belt of the belt press.
  • the surface of the press belt of the belt press advantageously has a fiber structure with fibers having a fineness ⁇ 44 dtex, in particular ⁇ 17 dtex and preferably ⁇ 11 dtex.
  • the permeable press belt of the belt press preferably has a permeability, in particular air permeability, of more than 0.1016 m 3 / (m 2 * s) (20 cfm), in particular more than 0.3048 m 3 / (m 2 * s) (60 cfm) and preferably more than 0.508 m 3 / (m 2 * s) (100 cfm).
  • the press belt of the belt press has a thickness ⁇ 4 mm, in particular ⁇ 2.8 mm, and preferably ⁇ 1.9 mm.
  • the radius of curvature of the curved surface of the counter element of the counter roll of the belt press is advantageously ⁇ 0.6 m and is preferably in the range of 0.35 m. If, for example, a blower roll is provided as the counter element of the belt press, its diameter is correspondingly advantageously ⁇ 1.2 m and is preferably in the range of 0.7 m. With a correspondingly small radius of curvature or diameter higher centrifugal forces are achieved, with a correspondingly higher drainage is achieved.
  • the device according to the invention is thus particularly suitable for producing a structured, voluminous tissue web, wherein the fibrous web produced can in particular have more than 70% non-pressed fibers and a thickness which is in particular twice or more than twice as large and correspondingly a higher volume and a corresponding one has higher water absorbency than the aforementioned known devices.
  • the device according to the invention can in particular also be operated at higher speeds.
  • the investment and energy costs are lower than in the known devices such as TAD (Through Air Drying) machines or crescent formers with a shoe press.
  • the belt press according to the invention can be arranged downstream of a drying zone with a drying cylinder, in particular a Yankee cylinder.
  • a structured fibrous web can be dewatered using the belt press using a very low pressing pressure of, for example, about 0.85 bar and with a very long press nip of, for example, 0.9 m, which is about 15 times longer than in a conventional press, for example a press nip with a length of 60 mm and is operated at, for example, 35 bar.
  • a dry content in the range of 12 to 30% and more can be achieved.
  • the fibrous web of the drying zone is supplied with a dry content ⁇ 30%, so that the fibrous web can be further dried in this one drying cylinder, in particular Yankee cylinder with associated drying hood, comprehensive drying zone.
  • the device according to the invention can be obtained in a simple manner by a corresponding conversion, for example, of a conventional paper machine with a shoe press.
  • hot, dry air, steam or moist, hot air can be used as the fluid.
  • the fluid can serve for heating the fibrous web and / or for receiving water from the fibrous web.
  • the fluid may be at least partially removed from the hood exhaust air of the hood associated with the drying cylinder of the drying zone, whereby the energy consumption is further reduced accordingly.
  • the fibrous web is preferably formed on the structured carrier strip, with which the fibrous web is preferably transferred to the belt press and through it into the downstream of the belt press drying zone.
  • the press formed with the drying cylinder of the drying zone only the bumps of the structured strip are pressed, leaving 70 to 80% of the fibers of the fibrous web completely unpressed, resulting in an overall voluminous fibrous web of greater thickness and higher specific volume.
  • the fibrous web can also be formed, for example, in a twin-wire former or another type of former.
  • the formed fibrous web can also be transferred by means of a pick-up shoe or the like to the structured carrier tape.
  • the high tensile tension permeable press belt of the belt press may be a high tension belt, such as a reinforced felt reinforced seam or an endless knit fiber reinforced fiber (Felted Belt) endlessly knit fabric.
  • a high tension belt such as a reinforced felt reinforced seam or an endless knit fiber reinforced fiber (Felted Belt) endlessly knit fabric.
  • the press belt should have even at higher temperatures only limited elongation, especially since the fluid is hot and in the paper machine in question usually only limited space is available.
  • the reinforced structure of the press belt may have a woven or a non-woven structure, depending on the required conditions of tension and temperature.
  • the material used can also contain components of a biko type (components with bico character).
  • Biko fibers bis-component fibers themselves are known in the art. It is advantageous to use such biko fibers and / or yarns for the production of the press belt both for the support structure and for the design of the at least paper-contacting surface of the press belt.
  • Biko fibers or yarns comprise two material components. The first material component forms the core of the fibers or yarns and the second material component encloses or encases the first material component.
  • a band structure of the press belt without fibers is also conceivable, which also facilitates conditioning and avoids rapid contamination of the structure.
  • the surface structure, in particular the contact side of the press belt for example, during casting of the tape and / or by melting of Plastics or other materials and / or by material-removing processes, for example, be produced by laser or water jet technology.
  • the advantage here lies in the manufacturability of an almost arbitrarily configurable surface structure.
  • the permeability can be generated, for example, during casting of the strip and / or by material-removing processes, for example by laser or water jet technology.
  • the pressing pressure p generated in the press nip of the belt press results from the quotient of the tension T and the radius of curvature of the counter element of the belt press or the radius R of a blowing roller provided as a counter element. For example, at a tensile stress of 30 kN / m and a diameter of a blow roll of 0.7 m, a pressure of 0.85 bar acting on the sandwich of fibrous web and carrier tape results.
  • the dewatering in the belt press thus takes place starting from the curved surface of the counter element to the press belt through first the porous carrier belt and then through the fibrous web.
  • the particular structured permeable carrier tape runs approximately dry on the side of the counter element through the press nip the Belt press, which results in a much lower rewet compared to a felt on the side of the mating element.
  • the fibrous web remains on the structured carrier belt and not on the felted press belt, since the fibers of the fibrous web lie in the depressions of the structured carrier belt.
  • the achievable with such a belt press dry content is in particular at least 7% higher than without belt press and with a carrier tape with a normal felt configuration and 12% higher than without belt press and with a carrier tape with the textured tape configuration.
  • the press nip of the belt press may in particular have a length ⁇ 700 mm.
  • the achievable dry content is further increased.
  • the drying zone In the drying zone, only the bumps of the carrier tape are pressed.
  • the press formed with the drying cylinder serves only for the further transport of the fibrous web and not the increase of the dry content.
  • a dry content of at least 30% should be achieved at the outlet of the belt press, which corresponds to the dry content immediately after the press formed with the drying cylinder of the drying zone.
  • the fibrous web can be further dried by means of the drying cylinder and the dryer hood associated therewith without the production of dents and without problems in terms of runability or machinability.
  • FIGURE shows a schematic representation of an exemplary embodiment of a device according to the invention for dewatering a fibrous web.
  • FIG. 1 shows a device 10 for dewatering a fibrous web 12, which can be used in particular as a machine for producing a voluminous tissue web.
  • the apparatus 10 or machine comprises a belt press 14 which comprises a press nip 16 elongated in the web running direction L, which is formed between a permeable press belt 18 and a curved surface of a counter element 20, which is at least partially wrapped by the press belt 18.
  • the fibrous web 12 is guided together with a permeable carrier tape 22 through the press nip 16 of the belt press 14.
  • means are provided to pressurize at least a portion of the press nip 16 of the belt press 14 with a fluid so that it flows through the carrier belt 22 and the fibrous web 12 therethrough.
  • the fluid loading means comprise a blowing device, which is arranged and designed so that the fluid flows from the curved surface of the counter-element 20 of the belt press 14 to the press belt 18 of the belt press 14. On the side of the counter element 20 of the belt press 14 thus results in a blowing zone 24, which extends along at least a portion of the press nips 16 of the belt press 14.
  • the blowing device may, for example, comprise a blow box assigned to the counter element of the belt press 14.
  • the counter element 20 of the belt press 14 comprises, for example, a blower roll.
  • the fibrous web 12 is guided lying between the carrier tape 22 and the press belt 18 lying through the press nip 16 of the belt press 14.
  • the guided together with the carrier tape 22 through the press nip 16 of the belt press 14 fibrous web 12, the press belt 18 and the carrier tape 22, the counter-element 20 of the belt press 14th
  • the at least a portion of the press nips 16 of the belt press 14 acting fluid may in particular contain hot, humid air and / or steam.
  • the device 10 is designed in particular to form a structured fibrous web 12.
  • a structured band is provided as a carrier tape 22.
  • the fibrous web 12 is guided together with the carrier tape 22 from a forming zone 26 to the belt press 14 and through this.
  • a forming zone 26 is provided in the present case, in which the fibrous web 12 is formed on the structured permeable carrier tape 22.
  • the carrier tape 22 is guided, together with a forming belt 28, to form a feed gap 32, which is acted upon by pulp suspension from a headbox 30, around a forming element 34, here a forming roll.
  • the forming belt 28 is again separated from the fibrous web 12 and the carrier tape 22 and the fibrous web 12 is continued together with the carrier tape.
  • the belt press 14 is followed by a drying zone 36, which is fed to the fibrous web 12 together with the carrier tape 22.
  • the drying zone 36 comprises a drying cylinder 38, in the present case, for example, a Yankee cylinder, and a hood 40 associated with the drying cylinder 38.
  • the hood guides the fibrous web guided around the drying cylinder 38 with hot fluid, in particular hot air.
  • the drying cylinder 38 is associated with a counter element 44, which is in the present case, for example, a shoe press roll to form an at least substantially only the transfer of the fibrous web 12 from the carrier tape 22 to the drying cylinder 38 serving further press zone 42.
  • a counter element 44 which is in the present case, for example, a shoe press roll to form an at least substantially only the transfer of the fibrous web 12 from the carrier tape 22 to the drying cylinder 38 serving further press zone 42.
  • the fibrous web 12 is transferred in the region of the further press zone 42 from the carrier tape 22 to the drying cylinder 38 and continued thereon.
  • this drying cylinder 38 with associated hood 40 comprising drying zone 36 the fibrous web 12 is then further dried.
  • the press belt of the belt press 14 can be designed in particular for a tensile stress ⁇ 30 kN / m.
  • a tensile stress in the range from about 10 kN / m to about 30 kN / m can act on the press belt 18 in particular.
  • the radius of curvature of the curved surface of the counter-element 20 of the belt press 14 may in particular be ⁇ 0.6 m and in particular be in the range of 0.35 m.
  • the fibrous web 12 can have, for example, a dry content (TG) of 10% immediately before the belt press 14 and immediately after the further press zone 42 serving merely to transfer the fibrous web 12 onto the drying cylinder 38, in particular having a dry content ⁇ 30% ,
  • TG dry content
  • the transferred to the drying cylinder 38 fibrous web 12 may in particular contain between about 70 to about 80% unpressed fibers.

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zur Entwässerung einer Faserstoffbahn, insbesondere einer Papier-, Karton- oder Tissuebahn, mit einer Bandpresse, die einen in Bahnlaufrichtung verlängerten Pressnip umfasst, der zwischen einem permeablen Pressband und einer zumindest teilweise von dem Pressband umschlungenen gekrümmten Oberfläche eines Gegenelements gebildet ist, wobei die Faserstoffbahn zusammen mit einem permeablen Trägerband durch den Pressnip der Bandpresse geführt ist und Mittel vorgesehen sind, um zumindest einen Teilbereich des Pressnips der Bandpresse so mit einem Fluid zu beaufschlagen, dass dieses durch das Trägerband und die Faserstoffbahn hindurchströmt, wobei die Fluidbeaufschlagungsmittel eine Blaseinrichtung umfassen, die so angeordnet ist, dass das Fluid ausgehend von der gekrümmten Oberfläche des Gegenelements der Bandpresse zu dem Pressband der Bandpresse hin strömt. In der US7 351 307 B2 ist bereits eine Vorrichtung zur Herstellung einer voluminösen Tissuebahn beschrieben, bei der eine sogenannte Bandpresse in Verbindung mit einer Heißlufthaube und einer Dampfbeaufschlagung zur Entwässerung der Faserstoffbahn bis zu einem bestimmten Trockengehalt eingesetzt wird.The present invention relates to a device for dewatering a fibrous web, in particular a paper, board or tissue web, with a belt press comprising a web-extended nip between a permeable press belt and an at least partially looped by the press belt curved surface of a counter element is formed, wherein the fibrous web is guided together with a permeable carrier tape through the press nip of the belt press and means are provided to pressurize at least a portion of the press nip the belt press so that it flows through the carrier belt and the fibrous web, wherein the Fluidbeaufschlagungsmittel comprise a blowing device which is arranged so that the fluid flows from the curved surface of the counter element of the belt press to the press belt of the belt press. In the US 7,351,307 B2 An apparatus for producing a voluminous tissue web is already described in which a so-called belt press is used in conjunction with a hot air hood and a steam for dewatering the fibrous web up to a certain dry content.

Das Dokument EP 1 852 551 A1 offenbart eine Entwässerungsvorrichtung zur Entwässerung einer Papier-, Tissue- oder einer anderen Faserstoffbahn in einer Maschine zur Herstellung oder Veredlung derselben. Die Faserstoffbahn wird dabei zwischen zwei Bändern liegend über eine Blaswalze geführt, welche Blasluft im Umschlingungsbereich zur Faserstoffbahn richtet.The document EP 1 852 551 A1 discloses a dewatering apparatus for dewatering a paper, tissue or other fibrous web in a machine for making or finishing the same. The fibrous web is guided lying between two bands on a blow roll, which directs blown air in the wrap to the fibrous web.

Das Dokument DE 103 03 959 A1 beschreibt eine Verdrängungsentwässerungspresse zur Entwässerung einer Faserstoffbahn. Die Faserstoffbahn wird dabei ebenfalls zwischen zwei Bändern liegend über eine Blaswalze geführt, welche Blasluft im Umschlingungsbereich zur Faserstoffbahn richtet. Die Entwässerung erfolgt dabei unter gleichzeitiger Anwendung von Gasdruck und mechanischem Druck zur Verdrängung des Wassers in der Faserstoffbahn.The document DE 103 03 959 A1 describes a displacement dewatering press for dewatering a fibrous web. The fibrous web will be there also guided lying between two bands on a blower roll, which directs blown air in the wrap to the fibrous web. The dewatering takes place with simultaneous application of gas pressure and mechanical pressure to displace the water in the fibrous web.

Aus der US 2010/7615136 B2 , US 2007/7297233 B2 , US 7 815 773 B2 und WO 2012/143163 A1 sind bereits Vorrichtungen zur Herstellung einer herkömmlichen Tissuebahn bekannt, die jeweils eine Presszone mit einem in Bahnlaufrichtung verlängerten Pressnip insbesondere einer Bandpresse umfassen und bei denen die Faserstoffbahn anschließend einem Trockenzylinder zugeführt wird.From the US 2010/7615136 B2 . US 2007/7297233 B2 . US Pat. No. 7,815,773 B2 and WO 2012/143163 A1 Devices are already known for the production of a conventional tissue web, each of which comprises a press zone with a press nip extended in the web running direction, in particular a belt press, and in which the fibrous web is subsequently fed to a drying cylinder.

Bei einem herkömmlichen Crescent-Former wird die Faserstoffbahn in der Formierzone durch ein Formiersieb mittels aufgebrachter Zentrifugalkräfte bis zu einem Feststoffgehalt von etwa 12 % entwässert, woraufhin die Faserstoffbahn mittels Vakuum bis zu einem Feststoffgehalt von etwa 23 % sowie mechanisch von einem Feststoffgehalt von etwa 23 % bis etwa 40 % weiter entwässert wird. Damit wird die Faserstoffbahn stark komprimiert, was sich negativ auf deren Dicke, Volumen und Wasseraufnahmefähigkeit auswirkt. Ein Pressen einer Tissuebahn ist zwar grundsätzlich unerwünscht, jedoch erforderlich, um den gewünschten Trockengehalt zu erzielen und die Faserstoffbahn zudem mittels einer Yankee-Trockenhaube zu trocknen.In a conventional crescent former, the fibrous web in the forming zone is dewatered through a forming wire by means of applied centrifugal forces to a solids content of about 12%, whereupon the fibrous web is further dehydrated by vacuum to a solids content of about 23% and mechanically from a solids content of about 23% to about 40%. Thus, the fibrous web is highly compressed, which adversely affects their thickness, volume and water absorbency. Although pressing a tissue web is basically undesirable, it is necessary to achieve the desired dry content and, moreover, to dry the fibrous web by means of a Yankee drying hood.

Eine Trockengehaltsgrenze von 23 % stellt mehr oder weniger den maximalen Trockengehaltswert in der Trockengehalts-Vakuum-Kurve dar, den man durch eine Entwässerung einer Tissuebahn auf einem Nassfilz erreichen kann. Die Bereitstellung einer größeren Vakuumkapazität ist energietechnisch nicht effizient. Der Erfindung liegt die Aufgabe zugrunde, eine verbesserte Vorrichtung der eingangs genannten Art anzugeben, mit der bei möglichst gering gehaltenem Energiebedarf unter Vermeidung einer unerwünschten übermäßigen Komprimierung der Faserstoffbahn ein höherer Trockengehalt der Faserstoffbahn unmittelbar nach der Bandpresse erreichbar und die damit insbesondere auch zur Herstellung einer voluminösen Tissuebahn einsetzbar ist.A dry content limit of 23% more or less represents the maximum dry content value in the dry content vacuum curve that can be achieved by dewatering a tissue web on a wet felt. The provision of a larger vacuum capacity is not energy efficient. The invention has for its object to provide an improved device of the type mentioned above, with the lowest possible energy consumption while avoiding unwanted excessive compression of the fibrous web reach a higher dry content of the fibrous web immediately after the belt press and thus in particular also for the production of a voluminous Tissuebahn can be used.

Erfindungsgemäß wird diese Aufgabe durch eine Vorrichtung mit den Merkmalen des Anspruchs 1 gelöst. Bevorzugte Ausführungsformen der erfindungsgemäßen Vorrichtung sind in den Unteransprüchen angegeben.According to the invention this object is achieved by a device having the features of claim 1. Preferred embodiments of the device according to the invention are specified in the subclaims.

Erfindungsgemäß ist vorgesehen, dass das Pressband der Bandpresse eine Dicke ≤ 4 mm, insbesondere ≤ 2,8 mm und vorzugsweise ≤ 1,9 mm besitzt.According to the invention, it is provided that the press belt of the belt press has a thickness ≦ 4 mm, in particular ≦ 2.8 mm, and preferably ≦ 1.9 mm.

Die Fluidbeaufschlagungsmittel der Vorrichtung umfassen eine Blaseinrichtung, die so angeordnet und ausgeführt ist, dass das Fluid ausgehend von der gekrümmten Oberfläche des Gegenelements der Bandpresse zu dem Pressband der Bandpresse hin strömt.The fluid loading means of the device comprise a blowing device, which is arranged and designed so that the fluid, starting from the curved surface of the counter element of the belt press flows towards the press belt of the belt press.

Das Fluid strömt somit in Richtung der infolge der gekrümmten Oberfläche des Gegenelements auf die Faserstoffbahn einwirkenden Zentrifugalkraft. Damit ergibt sich nicht nur eine Verringerung des zur Fluidbeaufschlagung erforderlichen Energiebedarfs, es sind auch höhere Bahnlaufgeschwindigkeiten möglich, nachdem anders als bei einer herkömmlichen Vakuumbeaufschlagung auf der Seite des Gegenelements nicht zunächst die Zentrifugalkraft kompensiert werden muss, um eine entsprechende Entwässerungswirkung zu erzielen. Da die Fluidströmung erfindungsgemäß in Richtung der auf die Faserstoffbahn einwirkenden Zentrifugalkraft wirkt und demzufolge die Entwässerung der Faserstoffbahn in dem Pressnip der Bandpresse auch durch die Zentrifugalkraft unterstützt wird, lassen sich bei gering gehaltenem Energieaufwand entsprechend höhere Trockengehalte der Faserstoffbahn unmittelbar im Anschluss an die Bandpresse erzielen, was insbesondere dann von Vorteil ist, wenn die Faserstoffbahn anschließend noch einer der Bandpresse nachgeordneten Trocknungszone zugeführt werden soll.The fluid thus flows in the direction of the force acting on the fibrous web due to the curved surface of the counter-element centrifugal force. This not only results in a reduction in the energy requirement required for fluid application, but also higher web speeds are possible, since unlike a conventional vacuum on the side of the counter element not the first centrifugal force must be compensated to achieve a corresponding dewatering effect. Since the fluid flow according to the invention acts in the direction of the force acting on the fibrous web centrifugal force and consequently the dewatering of the fibrous web in the press nip of the belt press is also supported by the centrifugal force, can be achieved at low energy consumption correspondingly higher dry contents of the fibrous web immediately after the belt press, which is particularly advantageous if the fibrous web is subsequently to be fed to a downstream of the belt press drying zone.

Die Blaseinrichtung kann insbesondere einen dem Gegenelement der Bandpresse zugeordneten Blaskasten umfassen.The blowing device may in particular comprise a blow box assigned to the counter element of the belt press.

Bevorzugt ist die Faserstoffbahn zwischen dem Trägerband und dem Pressband liegend durch den Pressnip der Bandpresse geführt.Preferably, the fibrous web is guided lying between the carrier tape and the press belt lying through the press nip of the belt press.

Gemäß einer bevorzugten praktischen Ausführungsform der erfindungsgemäßen Vorrichtung berührt die zusammen mit dem Trägerband durch den Pressnip der Bandpresse geführte Faserstoffbahn das Pressband und das Trägerband das Gegenelement der Bandpresse. Im vorliegenden Fall wird also nur das Trägerband mit der Faserstoffbahn durch den Pressnip der Bandpresse geführt.According to a preferred practical embodiment of the device according to the invention, the fibrous web guided together with the carrier belt through the press nip of the belt press contacts the press belt and the carrier belt the counter element of the belt press. In the present case, therefore, only the carrier tape with the fibrous web is passed through the press nip of the belt press.

Zur Erzielung eines möglichst hohen Trockengehalts enthält das zumindest einen Teilbereich des Pressnips der Bandpresse beaufschlagende Fluid vorteilhafterweise heiße, feuchte Luft und/oder Dampf.To achieve the highest possible dry content, the fluid acting on at least a portion of the press nips of the belt press advantageously contains hot, moist air and / or steam.

Gemäß einer besonders bevorzugten Ausführungsform der Erfindung ist die Vorrichtung zur Bildung einer strukturierten Faserstoffbahn ausgeführt und als Trägerband ein strukturiertes Band vorgesehen. Eine entsprechende Vorrichtung ist insbesondere zur Herstellung einer voluminösen Tissuebahn geeignet.According to a particularly preferred embodiment of the invention, the device is designed to form a structured fibrous web and provided as a carrier tape, a structured band. A corresponding device is particularly suitable for producing a voluminous tissue web.

Die Faserstoffbahn ist bevorzugt zusammen mit dem Trägerband aus einer Formierzone der Vorrichtung bis zur Bandpresse und durch diese hindurchgeführt.The fibrous web is preferably passed together with the carrier tape from a forming zone of the device to the belt press and through it.

Die Vorrichtung kann insbesondere eine Formierzone umfassen, in der die Faserstoffbahn auf dem vorzugsweise strukturierten Trägerband gebildet wird.The device may in particular comprise a forming zone in which the fibrous web is formed on the preferably structured carrier tape.

Der Bandpresse ist zudem bevorzugt eine Trocknungszone nachgeordnet, der die Faserstoffbahn zusammen mit dem Trägerband zugeführt ist. Dabei besitzt eine solche Trocknungszone zweckmäßigerweise einen Trockenzylinder, insbesondere Yankee-Zylinder, und vorzugsweise eine dem Trockenzylinder zugeordnete Haube.The belt press is also preferably arranged downstream of a drying zone, which is fed to the fibrous web together with the carrier tape. In this case, such a drying zone expediently has a drying cylinder, in particular Yankee cylinder, and preferably a hood associated with the drying cylinder.

Bevorzugt ist dem Trockenzylinder zur Bildung einer weiteren Presszone ein Gegenelement zugeordnet, das vorteilhafterweise ein Schuhpresselement, insbesondere Schuhpresswalze, ein Gegenelement mit zugeordneter Saugeinrichtung, insbesondere Saugwalze, oder eine herkömmliche Presswalze umfasst.Preferably, the drying cylinder for forming a further pressing zone associated with a counter-element, which advantageously comprises a shoe pressing element, in particular shoe press roll, a counter-element with associated suction device, in particular suction roll, or a conventional press roll.

Bevorzugt wird die Faserstoffbahn im Bereich der weiteren Presszone von dem Trägerband an den Trockenzylinder übergeben und auf diesem weitergeführt.Preferably, the fibrous web is transferred in the region of the further press zone of the carrier tape to the drying cylinder and continued on this.

Das Pressband der Bandpresse ist für eine möglichst hohe Zugspannung und bevorzugt für eine Zugspannung ≥ 30 kN/m ausgelegt.The press belt of the belt press is designed for the highest possible tensile stress and preferably for a tensile stress ≥ 30 kN / m.

Gemäß einer bevorzugten praktischen Ausführungsform der erfindungsgemäßen Vorrichtung wirkt auf das Pressband der Bandpresse eine Zugspannung im Bereich von etwa 10 kN/m bis etwa 30 kN/m.According to a preferred practical embodiment of the device according to the invention, a tensile stress in the range from about 10 kN / m to about 30 kN / m acts on the press belt of the belt press.

Insbesondere zur Vermeidung eines Blattentzugs (sheet stealing) besitzt die Oberfläche des Pressbandes der Bandpresse vorteilhafterweise eine Faserstruktur mit Fasern, die eine Feinheit ≤ 44 dtex, insbesondere ≤ 17 dtex und vorzugsweise ≤ 11 dtex aufweisen.In particular, in order to avoid sheet stealing, the surface of the press belt of the belt press advantageously has a fiber structure with fibers having a fineness ≦ 44 dtex, in particular ≦ 17 dtex and preferably ≦ 11 dtex.

Das permeable Pressband der Bandpresse weist bevorzugt eine Permeabilität, insbesondere Luftdurchlässigkeit, von mehr als 0,1016 m3/(m2 * s) (20 cfm), insbesondere mehr als 0,3048 m3/(m2 * s) (60 cfm) und vorzugsweise mehr als 0,508 m3/(m2 * s) (100 cfm) auf.The permeable press belt of the belt press preferably has a permeability, in particular air permeability, of more than 0.1016 m 3 / (m 2 * s) (20 cfm), in particular more than 0.3048 m 3 / (m 2 * s) (60 cfm) and preferably more than 0.508 m 3 / (m 2 * s) (100 cfm).

Da die Wasser- und Luftströmung durch das Pressband hindurchgehen muss und die Verweilzeit im Pressband begrenzt ist, sollte dessen Dicke möglichst gering sein. Deshalb besitzt das Pressband der Bandpresse eine Dicke ≤ 4 mm, insbesondere ≤ 2,8 mm und vorzugsweise ≤ 1,9 mm.Since the water and air flow must pass through the press belt and the residence time is limited in the press belt, its thickness should be as low as possible. Therefore, the press belt of the belt press has a thickness ≦ 4 mm, in particular ≦ 2.8 mm, and preferably ≦ 1.9 mm.

Der Krümmungsradius der gekrümmten Oberfläche des Gegenelements der Gegenwalze der Bandpresse ist vorteilhafterweise ≤ 0,6 m und liegt bevorzugt im Bereich von 0,35 m. Ist als Gegenelement der Bandpresse beispielsweise eine Blaswalze vorgesehen, so ist deren Durchmesser entsprechend vorteilhafterweise ≤ 1,2 m und liegt bevorzugt im Bereich von 0,7 m. Mit einem entsprechend kleinen Krümmungsradius bzw. Durchmesser werden höhere Zentrifugalkräfte erreicht, wobei eine entsprechend höhere Entwässerung erreicht wird.The radius of curvature of the curved surface of the counter element of the counter roll of the belt press is advantageously ≦ 0.6 m and is preferably in the range of 0.35 m. If, for example, a blower roll is provided as the counter element of the belt press, its diameter is correspondingly advantageously ≦ 1.2 m and is preferably in the range of 0.7 m. With a correspondingly small radius of curvature or diameter higher centrifugal forces are achieved, with a correspondingly higher drainage is achieved.

Die erfindungsgemäße Vorrichtung ist damit insbesondere zur Herstellung einer strukturierten voluminösen Tissuebahn geeignet, wobei die hergestellte Faserstoffbahn insbesondere mehr als 70 % nicht gepresste Fasern sowie eine Dicke besitzen kann, die insbesondere doppelt oder mehr als doppelt so groß ist und entsprechend ein höheres Volumen sowie eine entsprechend höhere Wasseraufnahmefähigkeit besitzt als die zuvor genannten bekannten Vorrichtungen. Die erfindungsgemäße Vorrichtung kann insbesondere auch bei höheren Geschwindigkeiten betrieben werden. Zudem sind die Investitions- und Energiekosten geringer als bei den bekannten Vorrichtungen wie beispielsweise TAD (Through Air Drying)-Maschinen oder Crescent-Formern mit einer Schuhpresse.The device according to the invention is thus particularly suitable for producing a structured, voluminous tissue web, wherein the fibrous web produced can in particular have more than 70% non-pressed fibers and a thickness which is in particular twice or more than twice as large and correspondingly a higher volume and a corresponding one has higher water absorbency than the aforementioned known devices. The device according to the invention can in particular also be operated at higher speeds. In addition, the investment and energy costs are lower than in the known devices such as TAD (Through Air Drying) machines or crescent formers with a shoe press.

Der erfindungsgemäßen Bandpresse kann, wie bereits erwähnt, eine Trocknungszone mit einem Trockenzylinder, insbesondere Yankee-Zylinder, nachgeordnet sein. Mit der Bandpresse kann insbesondere eine strukturierte Faserstoffbahn unter Verwendung eines sehr geringen Pressdrucks von beispielsweise etwa 0,85 bar und mit einem sehr langen Pressnip von beispielsweise 0,9 m entwässert werden, der etwa 15 mal länger als bei einer herkömmlichen Presse ist, die beispielsweise einen Pressnip mit einer Länge von 60 mm aufweist und bei beispielsweise 35 bar betrieben wird.As already mentioned, the belt press according to the invention can be arranged downstream of a drying zone with a drying cylinder, in particular a Yankee cylinder. In particular, a structured fibrous web can be dewatered using the belt press using a very low pressing pressure of, for example, about 0.85 bar and with a very long press nip of, for example, 0.9 m, which is about 15 times longer than in a conventional press, for example a press nip with a length of 60 mm and is operated at, for example, 35 bar.

Mit der Bandpresse der erfindungsgemäßen Vorrichtung kann beispielsweise ein Trockengehalt im Bereich von 12 bis 30 % und mehr erreicht werden. Bevorzugt wird die Faserstoffbahn der Trocknungszone mit einem Trockengehalt ≥ 30 % zugeführt, damit die Faserstoffbahn in dieser einen Trockenzylinder, insbesondere Yankee-Zylinder mit zugeordneter Trockenhaube, umfassenden Trocknungszone weiter getrocknet werden kann.With the belt press of the device according to the invention, for example, a dry content in the range of 12 to 30% and more can be achieved. Preferably, the fibrous web of the drying zone is supplied with a dry content ≥ 30%, so that the fibrous web can be further dried in this one drying cylinder, in particular Yankee cylinder with associated drying hood, comprehensive drying zone.

Die erfindungsgemäße Vorrichtung kann auf einfache Weise durch einen entsprechenden Umbau beispielsweise einer herkömmlichen Papiermaschine mit einer Schuhpresse erhalten werden.The device according to the invention can be obtained in a simple manner by a corresponding conversion, for example, of a conventional paper machine with a shoe press.

Als Fluid kann insbesondere heiße, trockene Luft, Dampf oder feuchte, heiße Luft verwendet werden. Das Fluid kann zur Aufheizung der Faserstoffbahn und/oder zur Aufnahme von Wasser aus der Faserstoffbahn dienen.In particular, hot, dry air, steam or moist, hot air can be used as the fluid. The fluid can serve for heating the fibrous web and / or for receiving water from the fibrous web.

Zweckmäßigerweise kann das Fluid zumindest teilweise aus der Haubenabluft der dem Trockenzylinder der Trocknungszone zugeordneten Haube entnommen sein, wodurch der Energieverbrauch entsprechend weiter gesenkt wird.Conveniently, the fluid may be at least partially removed from the hood exhaust air of the hood associated with the drying cylinder of the drying zone, whereby the energy consumption is further reduced accordingly.

In der Formierzone wird die Faserstoffbahn bevorzugt auf dem strukturierten Trägerband gebildet, mit dem die Faserstoffbahn vorzugsweise zur Bandpresse und durch diese hindurch bis in die der Bandpresse nachgeordnete Trocknungszone überführt wird. In der mit dem Trockenzylinder der Trocknungszone gebildeten Presse werden nur die Höcker des strukturierten Bandes gepresst, wobei 70 bis 80 % der Fasern der Faserstoffbahn völlig ungepresst bleiben, was insgesamt zu einer voluminöseren Faserstoffbahn mit größerer Dicke und höherem spezifischen Volumen führt.In the forming zone, the fibrous web is preferably formed on the structured carrier strip, with which the fibrous web is preferably transferred to the belt press and through it into the downstream of the belt press drying zone. In the press formed with the drying cylinder of the drying zone, only the bumps of the structured strip are pressed, leaving 70 to 80% of the fibers of the fibrous web completely unpressed, resulting in an overall voluminous fibrous web of greater thickness and higher specific volume.

Die Faserstoffbahn kann beispielsweise auch in einem Doppelsiebformer oder einer anderen Art von Former gebildet werden. Zudem kann die gebildete Faserstoffbahn auch mittels eines Aufnahmeschuhs oder dergleichen an das strukturierte Trägerband übergeben werden.The fibrous web can also be formed, for example, in a twin-wire former or another type of former. In addition, the formed fibrous web can also be transferred by means of a pick-up shoe or the like to the structured carrier tape.

Das für hohe Zugspannungen ausgelegte permeable Pressband der Bandpresse kann insbesondere ein Hochspannungsband wie beispielsweise ein verstärkter Filz mit verstärkter Naht oder einem endlosen spiralverknüpften Gewebe (reinforced wire with reinforced seam or endless spiral link fabric) mit eingenadelten Faserflorfasern (Felted Belt) sein.In particular, the high tensile tension permeable press belt of the belt press may be a high tension belt, such as a reinforced felt reinforced seam or an endless knit fiber reinforced fiber (Felted Belt) endlessly knit fabric.

Zudem soll das Pressband auch bei höheren Temperaturen eine nur begrenzte Längung besitzen, zumal das Fluid heiß ist und in der betreffenden Papiermaschine in der Regel nur begrenzt Raum zur Verfügung steht. Die verstärkte Struktur des Pressbandes kann eine gewobene oder eine nicht gewobene Struktur besitzen, je nach den geforderten Bedingungen bezüglich der Zugspannung und der Temperatur.In addition, the press belt should have even at higher temperatures only limited elongation, especially since the fluid is hot and in the paper machine in question usually only limited space is available. The reinforced structure of the press belt may have a woven or a non-woven structure, depending on the required conditions of tension and temperature.

Für eine hinreichende Spannungsfestigkeit des Pressbandes kann dessen Material insbesondere unterschiedliche Polymere enthalten (bevorzugt PET, PA und PU oder auch andere Polymere wie Keflar). Zur Erzeugung der betreffenden Struktur und Eigenschaften des Pressbandes kann das verwendete Material auch Komponenten von einer Biko-Art enthalten (components with bico character). Biko-Fasern (Bi-Komponenten Fasern) selbst sind aus dem Stand der Technik bekannt. Es ist vorteilhaft, solche Biko-Fasern und/oder -Garne für die Herstellung des Pressbandes sowohl für die Trägerstruktur als auch für die Gestaltung der zumindest papierberührten Oberfläche des Pressbandes zu verwenden. Biko-Fasern oder -Garne umfassen zwei Materialkomponenten. Die erste Materialkomponente bildet den Kern der Fasern oder Garne und die zweite Materialkomponente umschließt oder ummantelt die erste Materialkomponente. Hierdurch lassen sich die unterschiedlichen Eigenschaften der beiden Materialkomponenten in den Fasern oder Garnen kombinieren. Durch die Verwendung von BiKo-Fasern oder - Garnen für die Herstellung des Pressbandes können so beispielsweise eine hohe Zugfestigkeit und gleichzeitig eine gute Klebeeigenschaft mit benachbarten Fasern oder Garnen und/oder der Trägerstruktur erreicht werden.For a sufficient dielectric strength of the press belt whose material may contain in particular different polymers (preferably PET, PA and PU or other polymers such as Keflar). To produce the relevant structure and properties of the press belt, the material used can also contain components of a biko type (components with bico character). Biko fibers (bi-component fibers) themselves are known in the art. It is advantageous to use such biko fibers and / or yarns for the production of the press belt both for the support structure and for the design of the at least paper-contacting surface of the press belt. Biko fibers or yarns comprise two material components. The first material component forms the core of the fibers or yarns and the second material component encloses or encases the first material component. This makes it possible to combine the different properties of the two material components in the fibers or yarns. By using BiKo fibers or - yarns for the production of the press belt, for example, a high tensile strength and at the same time a good adhesive property with adjacent fibers or yarns and / or the support structure can be achieved.

Um einen zu hohen Stoffeintrag (z.B. Papierabfall) zu vermeiden, ist auch eine Bandstruktur des Pressbandes ohne Fasern denkbar, womit auch die Konditionierung erleichtert und eine schnelle Verschmutzung der Struktur vermieden werden. Dabei kann die Oberflächenstruktur insbesondere der Kontaktseite des Pressbandes beispielsweise beim Gießen des Bandes und/oder durch Aufschmelzen von Kunststoffen oder anderen Materialien und/oder durch Material abtragende Verfahren, beispielsweise mit Laser- oder Wasserstrahltechnik erzeugt werden. Der Vorteil hierbei liegt in der Herstellbarkeit einer nahezu beliebig gestaltbaren Oberflächenstruktur. Die Permeabilität kann beispielsweise beim Gießen des Bandes und/oder durch Material abtragende Verfahren, beispielsweise mit Laser- oder Wasserstrahltechnik erzeugt werden.In order to avoid an excessive input of material (eg paper waste), a band structure of the press belt without fibers is also conceivable, which also facilitates conditioning and avoids rapid contamination of the structure. In this case, the surface structure, in particular the contact side of the press belt, for example, during casting of the tape and / or by melting of Plastics or other materials and / or by material-removing processes, for example, be produced by laser or water jet technology. The advantage here lies in the manufacturability of an almost arbitrarily configurable surface structure. The permeability can be generated, for example, during casting of the strip and / or by material-removing processes, for example by laser or water jet technology.

Der im Pressnip der Bandpresse erzeugte Pressdruck p ergibt sich aus dem Quotienten aus der Zugspannung T und dem Krümmungsradius des Gegenelements der Bandpresse bzw. dem Radius R einer als Gegenelement vorgesehenen Blaswalze. So ergibt sich beispielsweise bei einer Zugspannung von 30 kN/m und einem Durchmesser einer Blaswalze von 0,7 m ein auf das Sandwich aus Faserstoffbahn und Trägerband wirkender Pressdruck von 0,85 bar.The pressing pressure p generated in the press nip of the belt press results from the quotient of the tension T and the radius of curvature of the counter element of the belt press or the radius R of a blowing roller provided as a counter element. For example, at a tensile stress of 30 kN / m and a diameter of a blow roll of 0.7 m, a pressure of 0.85 bar acting on the sandwich of fibrous web and carrier tape results.

Die gegebenenfalls vorgesehene Fasermatte oder der Faserflor des Pressbandes sowie der durch das Pressband bewirkte Pressdruck sorgen für einen engen Kontakt mit der Faserstoffbahn, wodurch die Kapillarentwässerung wesentlich verbessert wird. Zudem sind, nachdem die Fluidbeaufschlagung durch eine Blaseinrichtung in derselben Richtung wie die Zentrifugalkraft wirkt, höhere Bahnlaufgeschwindigkeiten möglich. Mit einem entsprechend kleinen Krümmungsradius der gekrümmten Oberfläche des Gegenelements bzw. einem entsprechend kleinen Durchmesser einer das Gegenelement bildenden Blaswalze ergibt sich eine höhere Zentrifugalkraft, wodurch die Entwässerung weiter gesteigert wird.The optionally provided fiber mat or the batt of the press belt and the pressing pressure caused by the press belt ensure close contact with the fibrous web, whereby the Kapillarentwässerung is significantly improved. In addition, after the fluid is acted upon by a blowing device in the same direction as the centrifugal force, higher web speeds are possible. With a correspondingly small radius of curvature of the curved surface of the counter-element or a correspondingly small diameter of a counter-element forming blower roller results in a higher centrifugal force, whereby the drainage is further increased.

Bei der erfindungsgemäßen Vorrichtung erfolgt die Entwässerung in der Bandpresse somit ausgehend von der gekrümmten Oberfläche des Gegenelements zum Pressband hin durch zunächst das poröse Trägerband und anschließend durch die Faserstoffbahn. Das insbesondere strukturierte permeable Trägerband läuft annähernd trocken auf der Seite des Gegenelements durch den Pressnip der Bandpresse, womit sich im Vergleich zu einem Filz auf der Seite des Gegenelements ein wesentlich geringeres Rückfeuchten ergibt.In the device according to the invention, the dewatering in the belt press thus takes place starting from the curved surface of the counter element to the press belt through first the porous carrier belt and then through the fibrous web. The particular structured permeable carrier tape runs approximately dry on the side of the counter element through the press nip the Belt press, which results in a much lower rewet compared to a felt on the side of the mating element.

Im Anschluss an die Bandpresse verbleibt die Faserstoffbahn an dem strukturierten Trägerband und nicht an dem mit Filzstoff versehenen Pressband, da die Fasern der Faserstoffbahn in den Vertiefungen des strukturierten Trägerbandes liegen.Following the belt press, the fibrous web remains on the structured carrier belt and not on the felted press belt, since the fibers of the fibrous web lie in the depressions of the structured carrier belt.

Trotz eines geringen durch das Pressband erzeugten Pressdrucks in der Bandpresse von beispielsweise 0,85 bar ist der mit einer solchen Bandpresse erreichbare Trockengehalt um insbesondere wenigstens 7 % höher als ohne Bandpresse und mit einem Trägerband mit einer normalen Filzkonfiguration und 12 % höher als ohne Bandpresse und mit einem Trägerband mit der strukturierten Bandkonfiguration.Despite a low generated by the press belt pressing pressure in the belt press, for example, 0.85 bar, the achievable with such a belt press dry content is in particular at least 7% higher than without belt press and with a carrier tape with a normal felt configuration and 12% higher than without belt press and with a carrier tape with the textured tape configuration.

Bei der erfindungsgemäßen Vorrichtung kann der Pressnip der Bandpresse insbesondere eine Länge ≥ 700 mm besitzen. Mit der Verwendung von Heißluft und/oder Dampf wird der erzielbare Trockengehalt weiter erhöht.In the apparatus according to the invention, the press nip of the belt press may in particular have a length ≥ 700 mm. With the use of hot air and / or steam, the achievable dry content is further increased.

In der Trocknungszone werden nur die Höcker des Trägerbandes gepresst. Die mit dem Trockenzylinder gebildete Presse dient lediglich dem Weitertransport der Faserstoffbahn und nicht der Erhöhung des Trockengehalts. Damit sollte am Ausgang der Bandpresse ein Trockengehalt von zumindest 30 % erreicht werden, was dem Trockengehalt unmittelbar nach der mit dem Trockenzylinder der Trocknungszone gebildeten Presse entspricht. Damit kann die Faserstoffbahn mittels des Trockenzylinders und der diesem zugeordneten Trockenhaube ohne die Erzeugung von Beulen und ohne Probleme in Bezug auf die Runability oder Maschinengängigkeit weiter getrocknet werden.In the drying zone, only the bumps of the carrier tape are pressed. The press formed with the drying cylinder serves only for the further transport of the fibrous web and not the increase of the dry content. Thus, a dry content of at least 30% should be achieved at the outlet of the belt press, which corresponds to the dry content immediately after the press formed with the drying cylinder of the drying zone. Thus, the fibrous web can be further dried by means of the drying cylinder and the dryer hood associated therewith without the production of dents and without problems in terms of runability or machinability.

Die Erfindung wird im Folgenden anhand eines Ausführungsbeispiels unter Bezugnahme auf die Zeichnung näher beschrieben. In dieser zeigt die einzige Figur in schematischer Darstellung eine beispielhafte Ausführungsform einer erfindungsgemäßen Vorrichtung zur Entwässerung einer Faserstoffbahn.The invention will be described in more detail below with reference to an embodiment with reference to the drawing. In this, the single FIGURE shows a schematic representation of an exemplary embodiment of a device according to the invention for dewatering a fibrous web.

Die einzige Figur 1 zeigt eine Vorrichtung 10 zur Entwässerung einer Faserstoffbahn 12, die insbesondere als Maschine zur Herstellung einer voluminösen Tissuebahn einsetzbar ist.The only FIG. 1 shows a device 10 for dewatering a fibrous web 12, which can be used in particular as a machine for producing a voluminous tissue web.

Die Vorrichtung 10 bzw. Maschine umfasst eine Bandpresse 14, die einen in Bahnlaufrichtung L verlängerten Pressnip 16 umfasst, der zwischen einem permeablen Pressband 18 und einer zumindest teilweise von dem Pressband 18 umschlungenen gekrümmten Oberfläche eines Gegenelements 20 gebildet ist.The apparatus 10 or machine comprises a belt press 14 which comprises a press nip 16 elongated in the web running direction L, which is formed between a permeable press belt 18 and a curved surface of a counter element 20, which is at least partially wrapped by the press belt 18.

Dabei ist die Faserstoffbahn 12 zusammen mit einem permeablen Trägerband 22 durch den Pressnip 16 der Bandpresse 14 geführt. Zudem sind Mittel vorgesehen, um zumindest einen Teilbereich des Pressnips 16 der Bandpresse 14 so mit einem Fluid zu beaufschlagen, dass dieses durch das Trägerband 22 und die Faserstoffbahn 12 hindurch strömt.In this case, the fibrous web 12 is guided together with a permeable carrier tape 22 through the press nip 16 of the belt press 14. In addition, means are provided to pressurize at least a portion of the press nip 16 of the belt press 14 with a fluid so that it flows through the carrier belt 22 and the fibrous web 12 therethrough.

Die Fluidbeaufschlagungsmittel umfassen eine Blaseinrichtung, die so angeordnet und ausgeführt ist, dass das Fluid ausgehend von der gekrümmten Oberfläche des Gegenelements 20 der Bandpresse 14 zu dem Pressband 18 der Bandpresse 14 hin strömt. Auf der Seite des Gegenelements 20 der Bandpresse 14 ergibt sich somit eine Blaszone 24, die sich entlang zumindest eines Teilbereichs des Pressnips 16 der Bandpresse 14 erstreckt.The fluid loading means comprise a blowing device, which is arranged and designed so that the fluid flows from the curved surface of the counter-element 20 of the belt press 14 to the press belt 18 of the belt press 14. On the side of the counter element 20 of the belt press 14 thus results in a blowing zone 24, which extends along at least a portion of the press nips 16 of the belt press 14.

Die Blaseinrichtung kann beispielsweise einen dem Gegenelement der Bandpresse 14 zugeordneten Blaskasten umfassen.The blowing device may, for example, comprise a blow box assigned to the counter element of the belt press 14.

Im vorliegenden Fall umfasst das Gegenelement 20 der Bandpresse 14 beispielsweise eine Blaswalze.In the present case, the counter element 20 of the belt press 14 comprises, for example, a blower roll.

Die Faserstoffbahn 12 ist zwischen dem Trägerband 22 und dem Pressband 18 liegend durch den Pressnip 16 der Bandpresse 14 geführt. Dabei berührt die zusammen mit dem Trägerband 22 durch den Pressnip 16 der Bandpresse 14 geführte Faserstoffbahn 12 das Pressband 18 und das Trägerband 22 das Gegenelement 20 der Bandpresse 14.The fibrous web 12 is guided lying between the carrier tape 22 and the press belt 18 lying through the press nip 16 of the belt press 14. In this case, the guided together with the carrier tape 22 through the press nip 16 of the belt press 14 fibrous web 12, the press belt 18 and the carrier tape 22, the counter-element 20 of the belt press 14th

Das zumindest einen Teilbereich des Pressnips 16 der Bandpresse 14 beaufschlagende Fluid kann insbesondere heiße, feuchte Luft und/oder Dampf enthalten.The at least a portion of the press nips 16 of the belt press 14 acting fluid may in particular contain hot, humid air and / or steam.

Die Vorrichtung 10 ist im vorliegenden Fall insbesondere zur Bildung einer strukturierten Faserstoffbahn 12 ausgeführt. Dazu ist als Trägerband 22 ein strukturiertes Band vorgesehen.In the present case, the device 10 is designed in particular to form a structured fibrous web 12. For this purpose, a structured band is provided as a carrier tape 22.

Die Faserstoffbahn 12 ist zusammen mit dem Trägerband 22 aus einer Formierzone 26 bis zur Bandpresse 14 und durch diese hindurchgeführt. Dabei ist im vorliegenden Fall eine Formierzone 26 vorgesehen, in der die Faserstoffbahn 12 auf dem strukturierten permeablen Trägerband 22 gebildet wird. Das Trägerband 22 ist zusammen mit einem Formierband 28 unter Bildung eines mit Faserstoffsuspension aus einem Stoffauflauf 30 beaufschlagten Einlaufspalts 32 um ein Formierelement 34, hier eine Formierwalze, geführt. Im Anschluss an das Formierelement 34 wird das Formierband 28 wieder von der Faserstoffbahn 12 und dem Trägerband 22 getrennt und die Faserstoffbahn 12 zusammen mit dem Trägerband weitergeführt.The fibrous web 12 is guided together with the carrier tape 22 from a forming zone 26 to the belt press 14 and through this. In this case, a forming zone 26 is provided in the present case, in which the fibrous web 12 is formed on the structured permeable carrier tape 22. The carrier tape 22 is guided, together with a forming belt 28, to form a feed gap 32, which is acted upon by pulp suspension from a headbox 30, around a forming element 34, here a forming roll. Following the forming element 34, the forming belt 28 is again separated from the fibrous web 12 and the carrier tape 22 and the fibrous web 12 is continued together with the carrier tape.

Der Bandpresse 14 ist eine Trocknungszone 36 nachgeordnet, der die Faserstoffbahn 12 zusammen mit dem Trägerband 22 zugeführt ist. Die Trocknungszone 36 umfasst einen Trockenzylinder 38, im vorliegenden Fall beispielsweise einen Yankee-Zylinder, und eine dem Trockenzylinder 38 zugeordnete Haube 40. Über die Haube wird die um den Trockenzylinder 38 geführte Faserstoffbahn mit heißem Fluid, insbesondere Heißluft, beaufschlagt.The belt press 14 is followed by a drying zone 36, which is fed to the fibrous web 12 together with the carrier tape 22. The drying zone 36 comprises a drying cylinder 38, in the present case, for example, a Yankee cylinder, and a hood 40 associated with the drying cylinder 38. The hood guides the fibrous web guided around the drying cylinder 38 with hot fluid, in particular hot air.

Dabei ist dem Trockenzylinder 38 zur Bildung einer zumindest im Wesentlichen nur der Übergabe der Faserstoffbahn 12 von dem Trägerband 22 an den Trockenzylinder 38 dienenden weiteren Presszone 42 ein Gegenelement 44 zugeordnet, bei dem es sich im vorliegenden Fall beispielsweise um eine Schuhpresswalze handelt.In this case, the drying cylinder 38 is associated with a counter element 44, which is in the present case, for example, a shoe press roll to form an at least substantially only the transfer of the fibrous web 12 from the carrier tape 22 to the drying cylinder 38 serving further press zone 42.

Wie bereits erwähnt, wird die Faserstoffbahn 12 im Bereich der weiteren Presszone 42 von dem Trägerband 22 an den Trockenzylinder 38 übergeben und auf diesem weitergeführt. In dieser den Trockenzylinder 38 mit zugeordneter Haube 40 umfassenden Trocknungszone 36 wird die Faserstoffbahn 12 dann weiter getrocknet.As already mentioned, the fibrous web 12 is transferred in the region of the further press zone 42 from the carrier tape 22 to the drying cylinder 38 and continued thereon. In this drying cylinder 38 with associated hood 40 comprising drying zone 36, the fibrous web 12 is then further dried.

Das Pressband der Bandpresse 14 kann insbesondere für eine Zugspannung ≥ 30 kN/m ausgelegt sein. Im Betrieb kann auf das Pressband 18 insbesondere eine Zugspannung im Bereich von etwa 10 kN/m bis etwa 30 kN/m wirken.The press belt of the belt press 14 can be designed in particular for a tensile stress ≥ 30 kN / m. In operation, a tensile stress in the range from about 10 kN / m to about 30 kN / m can act on the press belt 18 in particular.

Der Krümmungsradius der gekrümmten Oberfläche des Gegenelements 20 der Bandpresse 14 kann insbesondere ≤ 0,6 m sein und insbesondere im Bereich von 0,35 m liegen.The radius of curvature of the curved surface of the counter-element 20 of the belt press 14 may in particular be ≦ 0.6 m and in particular be in the range of 0.35 m.

Die Faserstoffbahn 12 kann unmittelbar vor der Bandpresse 14 beispielsweise einen Trockengehalt (TG) von 10 % und unmittelbar nach der Bandpresse 14 sowie unmittelbar nach der weiteren, lediglich der Überführung der Faserstoffbahn 12 auf den Trockenzylinder 38 dienenden Presszone 42 insbesondere einen Trockengehalt ≥ 30 % besitzen.The fibrous web 12 can have, for example, a dry content (TG) of 10% immediately before the belt press 14 and immediately after the further press zone 42 serving merely to transfer the fibrous web 12 onto the drying cylinder 38, in particular having a dry content ≥ 30% ,

Die an den Trockenzylinder 38 übergebene Faserstoffbahn 12 kann insbesondere zwischen etwa 70 bis etwa 80 % ungepresste Fasern enthalten.The transferred to the drying cylinder 38 fibrous web 12 may in particular contain between about 70 to about 80% unpressed fibers.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Vorrichtungcontraption
1212
FaserstoffbahnFibrous web
1414
Bandpressebelt press
1616
verlängerter Pressnipextended press nip
1818
permeables Pressbandpermeable press belt
2020
Gegenelementcounter-element
2222
permeables strukturiertes Trägerbandpermeable structured carrier tape
2424
Blaszoneblow zone
2626
Formierzoneforming zone
2828
Formierbandforming belt
3030
Stoffauflaufheadbox
3232
Einlaufspaltinlet gap
3434
Formierelementforming element
3636
Trocknungszonedrying zone
3838
Trockenzylinderdrying cylinders
4040
HaubeHood
4242
weitere Presszonefurther press zone
4444
Gegenelementcounter-element
LL
BahnlaufrichtungWeb direction

Claims (19)

  1. Device (10) for dewatering a fibre web (12), in particular a paper, board or tissue web, having a belt press (14) which comprises a press nip (16) that is extended in the web running direction (L) and is formed between a permeable press belt (18) and a curved surface of a mating element (20) around which the press belt (18) wraps, at least partly, the fibre web (12) being led through the press nip (16) of the belt press (14) together with a permeable support belt (22), and means being provided to apply a fluid to at least one sub-region of the press nip (16) of the belt press (14) such that the said fluid flows through the support belt (22) and the fibre web (12),
    the fluid application means comprising a blowing device, which is arranged and designed in such a way that, starting from the curved surface of the mating element (20) of the belt press (14), the fluid flows towards the press belt (18) of the belt press (14),
    characterized in that
    the press belt (18) of the belt press (14) has a thickness ≤ 4 mm, in particular ≤ 2.8 mm and preferably ≤ 1.9 mm.
  2. Device according to Claim 1,
    characterized in that the blowing device comprises a blower box assigned to the mating element (20) of the belt press (14).
  3. Device according to Claim 1 or 2,
    characterized in that the mating element (20) of the belt press (14) comprises a blower roll.
  4. Device according to at least one of the preceding claims,
    characterized in that the fibre web (12) is led through the press nip (16) of the belt press (14) whilst lying between the support belt (22) and the press belt (18).
  5. Device according to at least one of the preceding claims,
    characterized in that the fibre web (12) led through the press nip (16) of the belt press (14) together with the support belt (22) contacts the press belt (18) and the support belt (22) contacts the mating element (20) of the belt press (14).
  6. Device according to at least one of the preceding claims,
    characterized in that the fluid applied to at least one sub-region of the press nip (16) of the belt press (14) contains hot, moist air and/or steam.
  7. Device according to at least one of the preceding claims,
    characterized in that the device (10) is designed to form a structured fibre web (12) and a structured belt is provided as the support belt (22) .
  8. Device according to at least one of the preceding claims,
    characterized in that the fibre web (12), together with the support belt (22), is guided from a forming zone (26) as far as the belt press (14) and through the latter.
  9. Device according to at least one of the preceding claims,
    characterized in that a forming zone (26) is provided, in which the fibre web (12) is formed on the preferably structured support belt (22).
  10. Device according to at least one of the preceding claims,
    characterized in that a drying zone (36), to which the fibre web (12) is fed together with the support belt (22), is arranged downstream of the belt press (14).
  11. Device according to Claim 10,
    characterized in that the drying zone (36) comprises a drying cylinder (38), in particular a Yankee cylinder, and preferably a hood (40) assigned to the drying cylinder.
  12. Device according to Claim 11,
    characterized in that a mating element (44) is assigned to the drying cylinder (38) to form a further press zone (42).
  13. Device according to Claim 12,
    characterized in that a shoe press element, in particular a shoe press roll, a mating element with associated suction device, in particular a suction roll, or a press roll is assigned to the drying cylinder (38) to form the further press zone (42).
  14. Device according to Claim 13,
    characterized in that in the region of the further press zone (42), the fibre web (12) is transferred from the support belt (22) to the drying cylinder (38) and is guided further on the latter.
  15. Device according to at least one of the preceding claims,
    characterized in that the press belt (18) of the belt press (14) is designed for a tension ≥ 30 kN/m.
  16. Device according to at least one of the preceding claims,
    characterized in that a tension in the range from about 10 kN/m to about 30 kN/m acts on the press belt (18) of the belt press (14).
  17. Device according to at least one of the preceding claims,
    characterized in that the surface of the press belt (18) of the belt press (14) has a fibre structure with fibres which have a fineness ≤ 44 dtex, in particular ≤ 17 dtex and preferably ≤ 11 dtex.
  18. Device according to at least one of the preceding claims,
    characterized in that the permeable press belt (18) of the belt press (14), has a permeability, in particular an air permeability, of more than 0.1016 m3/(m2 * s) (20 cfm) in particular more than 0.3048 m3/(m2 * s) (60 cfm) and preferably more than 0.508 m3/(m2 * s) (100 cfm).
  19. Device according to at least one of the preceding claims,
    characterized in that the radius of curvature of the curved surface of the mating element (20) of the belt press (14) is ≤ 0.6 m and preferably lies in the region of 0.35 m.
EP15777659.2A 2014-10-29 2015-10-05 Device for dewatering a fiber web Active EP3212843B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014222010 2014-10-29
PCT/EP2015/072922 WO2016066375A1 (en) 2014-10-29 2015-10-05 Device for dewatering a fiber web

Publications (2)

Publication Number Publication Date
EP3212843A1 EP3212843A1 (en) 2017-09-06
EP3212843B1 true EP3212843B1 (en) 2018-07-18

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EP15777659.2A Active EP3212843B1 (en) 2014-10-29 2015-10-05 Device for dewatering a fiber web

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EP (1) EP3212843B1 (en)
CN (1) CN107148500B (en)
WO (1) WO2016066375A1 (en)

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DE102021117647A1 (en) 2021-07-08 2023-01-12 Voith Patent Gmbh Process and machine for producing a fibrous web
DE102021117643A1 (en) 2021-07-08 2023-01-12 Voith Patent Gmbh Process and machine for producing a fibrous web

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US7297233B2 (en) * 2004-01-30 2007-11-20 Voith Paper Patent Gmbh Dewatering apparatus in a paper machine
DE102006021328A1 (en) * 2006-05-05 2007-11-08 Voith Patent Gmbh dehydrator
DE102008054990A1 (en) * 2008-12-19 2010-06-24 Voith Patent Gmbh Apparatus and method for producing a material web
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DE102011007568A1 (en) * 2011-04-18 2012-10-18 Voith Patent Gmbh Apparatus and method for producing a material web
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CN105408539B (en) * 2013-07-04 2019-07-12 福伊特专利有限公司 Method for reequiping and running the equipment of manufacture adhesive-bonded fabric

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Also Published As

Publication number Publication date
WO2016066375A1 (en) 2016-05-06
CN107148500A (en) 2017-09-08
EP3212843A1 (en) 2017-09-06
CN107148500B (en) 2020-02-21

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