EP1176250B1 - Process and apparatus for making a fibrous web - Google Patents

Process and apparatus for making a fibrous web Download PDF

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Publication number
EP1176250B1
EP1176250B1 EP01107708A EP01107708A EP1176250B1 EP 1176250 B1 EP1176250 B1 EP 1176250B1 EP 01107708 A EP01107708 A EP 01107708A EP 01107708 A EP01107708 A EP 01107708A EP 1176250 B1 EP1176250 B1 EP 1176250B1
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EP
European Patent Office
Prior art keywords
belt
carrier
shoe press
fibrous web
process according
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.)
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EP01107708A
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German (de)
French (fr)
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EP1176250A3 (en
EP1176250A2 (en
Inventor
Thomas Thoröe Scherb
Harald Schmidt-Hebbel
Karl Dr. Steiner
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP1176250A3 publication Critical patent/EP1176250A3/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
    • D21F3/04—Arrangements thereof
    • D21F3/045—Arrangements thereof including at least one 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
    • D21F11/14—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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0281—Wet presses in combination with a dryer roll

Definitions

  • US 6,083,349 discloses a machine for making tissue paper having a press nip formed between a shoe press unit and a dryer cylinder. According to this document, the shoe press unit is surrounded in sections by a steam blower box, which is assigned in sections a suction box.
  • TAD Through Air Drying
  • WO 99/10597 shows a tissue paper machine with a suction press roll with associated overpressure hood.
  • the machine shown in this document has no shoe press.
  • the aim of the invention is to provide an improved device and an improved method of the type mentioned, with which the dry content of the tissue web both volume-saving and cost-effectively increased and, accordingly, the production of tissue can be made more economical.
  • this object is achieved in that is provided as the overpressure fluid for the hood superheated steam and / or dry hot air.
  • hood By standing under pressure hood, which may in particular be a smaller hood, the negative pressure effect of the evacuated device is supported, which improves the running ability of the tissue web, especially at higher speeds.
  • hood is particularly advantageous where the speeds are greater than about 1800 m / min, preferably greater than about 2000 m / min and in particular greater than about 2200 m / min.
  • the heating of the fibrous web caused by the overpressure fluid contributes substantially to the increase of the dewatering performance in the following extended press nip.
  • the steam and the dry hot air also intensify the drying in the area of the evacuated device.
  • the evacuated means comprises a suction roll.
  • the shoe press unit advantageously has at least transversely to the web running direction a plurality of independently controllable pressing zones.
  • the drying cylinder is provided as a tissue or Yankee drying cylinder, of which the fibrous web after drying is preferably abschabbar by means of a creping doctor.
  • the carrier tape is provided in a former part for receiving the pulp suspension from a headbox.
  • the carrier tape is expediently guided as an inner band via a forming roller or the like, is guided over the at least one endless outer screen.
  • a felt belt is provided.
  • the carrier or inner band is a screen belt, e.g. a drainage tape provided.
  • a screen belt e.g. a drainage tape provided.
  • an endless felt belt disposed between the carrier belt and the shoe press unit is additionally guided through the extended press nip, thereby preventing marks and promoting dewatering, or even selectively, especially when the carrier web is a marking tape (imprinting wire or felt).
  • the shoe press unit is preferably provided with a water-impermeable circulating endless press belt.
  • the Schuhpreßü can be formed in particular by a shoe press roll with a preferably water-impermeable press jacket.
  • the shoe press may in particular be designed as described in DE-A-99 125 789.0.
  • the method according to the invention is accordingly characterized in that overheated steam and / or dry hot air is used as the overpressure fluid for the hood.
  • the arrangement according to the invention and the method according to the invention can be used in particular in tissue machines of various designs, e.g. for suction breast roll former, twin wire former, crescent former, wire mesh, etc. Moreover, a combination with "through air drying" concepts is advantageous.
  • FIG. 1 shows, in a schematic partial view, a machine 10 designed as a crescent former for producing a fibrous web 12, which may in particular be a tissue or tissue paper web.
  • an endless inner or carrier tape 16 and an endless outer wire 18 are guided over a region of a so-called forming roller 14 together.
  • the wrap angle with respect to the outer screen 18 is smaller than that with respect to the inner carrier strip 16.
  • the pulp suspension In the inlet gap 20 formed between the carrier tape 16 and the outer wire 18 is introduced by means of a headbox 22, the pulp suspension.
  • the thereby forming fibrous web 12 is supplied to the wrapping region of the forming roller 14 together with the carrier tape 16 a lengthened in the web running direction L press nip 24.
  • the fibrous web 12 carrying carrier tape 16 wraps around here designed as a suction roller 26 evacuated device.
  • the suction roll 26 removes a substantial portion of the water from the carrier belt 16 and possibly even somewhat from the outer fibrous web 12.
  • the carrier tape 16 is provided as a felt belt.
  • the suction roller 26 By the suction roller 26, the water absorption capacity of the carrier tape 16 is increased, so that it in the following extended press nip 24, through which it runs together with the fibrous web 12, can absorb the squeezed out water.
  • this suction roller 26 is supported by a suction roller 26 associated, under pressure hood 28.
  • a small hood is sufficient.
  • the carrier tape 16 is guided together with the fibrous web 12 on the suction roller 26, wherein the fibrous web 12 is on the outside.
  • overpressure fluid for the hood 28 superheated steam and / or dry hot air is provided.
  • the shoe press 30 forming the extended press nip 24 comprises a drying cylinder 32 serving as a tissue or Yankee drying cylinder and a shoe pressing unit 34 having at least one press shoe 36 and a continuous endless press belt 38 guided over it.
  • the shoe press unit 34 is provided with a shoe press roll a flexible, preferably water-impermeable press jacket 38 is formed.
  • the press shoe 36 has an at least substantially concave contact surface 40.
  • the contact pressure can be effected, for example, hydraulically.
  • the region between the flexible press jacket 38 and the press shoe 36 can be lubricated in particular hydrostatically and / or hydrodynamically.
  • the shoe press unit 34 preferably has transversely to the web running direction L a plurality of independently controllable pressing zones, whereby a Adaptation to the deflection of the drying cylinder 32 and the setting of a desired pressing pressure profile transverse to the web running direction L is possible.
  • the running in the running direction L press nip 24 allows intensive and yet volume-saving drainage of the fibrous web 12th
  • the fibrous web 12 runs along the heated drying cylinder 32.
  • the drying is reinforced in this looping area by a drying hood 42, the hot, dry air blows on the fibrous web 12 and sucks again.
  • the fibrous web 12 is removed by a creping doctor 44 from the drying cylinder 32.
  • the creped fibrous web 12 can subsequently be further processed and wound up.
  • an additional suction element is provided between the suction roller 26 and the shoe press 30, which may be formed for example by a suction box 46 or the like.
  • a suction box 46 By this additional suction box 46, the dry content is further increased because it prevents the capillary caused by the backflow of water from the carrier tape 16 into the fibrous web 12.
  • FIG. 2 shows, in a schematic partial representation, a further embodiment of a machine 10 for producing a fibrous web 12, in which again, it may be a tissue or tissue paper web.
  • This embodiment differs from that according to FIG. 1 firstly in that, as the carrier or inner band 16, instead of a felt belt, a screen belt, e.g. a drainage tape is provided.
  • a screen belt e.g. a drainage tape
  • an endless felt belt 48 arranged between the carrier belt 16 and the shoe press unit 34 is additionally guided through the extended press nip 24 in order to prevent marks and to promote dewatering, or else to be generated selectively. especially if the carrier tape is an imprinting wire or felt.
  • the additional suction element 46 provided in the embodiment according to FIG. 1 between the suction roll 26 and the shoe press 30 has been omitted in the present case.

Abstract

Machine and process for producing a fibrous material web. The machine includes at least one shoe press having at least one drying cylinder and a shoe press unit which are arranged to form a pressing nip elongated in a web travel direction. At least one suctioned apparatus is arranged before the at least one shoe press relative to the web travel direction, and a water-permeable continuous carrying belt is arranged to guide the fibrous material web over the at least one suctioned apparatus and through the elongated pressing nip. A hood subjected to an overpressure is assigned to the suctioned apparatus and is arranged to support an underpressure effect of the at least one suctioned apparatus. The process includes guiding the fibrous material web and the carrying belt through the elongated pressing nip, and supporting an underpressure effect of the suctioned apparatus by creating an overpressure in the hood.

Description

Die Erfindung betrifft eine Maschine zur Herstellung einer Faserstoffbahn, insbesondere einer Tissue- oder Hygienepapierbahn, mit wenigstens einer einen Trockenzylinder und eine Schuhpresseinheit umfassenden Schuhpresse zur Bildung eines in Bahnlaufrichtung verlängerten Pressspaltes, wobei die Faserstoffbahn zusammen mit einem wasserdurchlässigen endlosen Trägerband durch den verlängerten Pressspalt geführt ist und das Trägerband in Bahnlaufrichtung vor der Schuhpresse zusammen mit der Faserstoffbahn, über wenigstens eine besaugte Einrichtung geführt ist, wobei das Trägerband zwischen der Faserstoffbahn und der besaugten Einrichtung liegt, und wobei die besaugte Einrichtung eine unter Überdruck stehende Haube zugeordnet ist, um die Unterdruckwirkung der besaugten Einrichtung zu unterstützen. Sie betrifft ferner ein Verfahren gemäß dem Oberbegriff des Anspruchs 16.The invention relates to a machine for producing a fibrous web, in particular a tissue or tissue paper web, comprising at least one shoe press comprising a drying cylinder and a shoe press unit for forming a press nip extended in the web running direction, the fibrous web being guided together with a water-permeable endless carrier tape through the extended press nip and the carrier tape in the web running direction in front of the shoe press together with the fibrous web, is guided over at least one evacuated device, wherein the carrier tape between the fibrous web and the evacuated device is located, and wherein the evacuated means is associated with a pressurized hood to the negative pressure effect of to assist evacuated facility. It further relates to a method according to the preamble of claim 16.

Eine Maschine der eingangs genannten Art ist in der US 6,083,349 beschrieben.A machine of the type mentioned is described in US 6,083,349.

Die US 6,083,349 offenbart eine Maschine zur Herstellung von Tissuepapier mit einem zwischen einer Schuhpresseinheit und einem Trockenzylinder gebildeten Pressspalt. Gemäß dieser Druckschrift wird die Schuhpresseinheit abschnittweise von einem Dampfblaskasten umgeben, dem abschnittweise ein Saugkasten zugeordnet ist.US 6,083,349 discloses a machine for making tissue paper having a press nip formed between a shoe press unit and a dryer cylinder. According to this document, the shoe press unit is surrounded in sections by a steam blower box, which is assigned in sections a suction box.

Bei einer aus der WO 97/03247 bekannten Tissuemaschine ist anstelle einer Schuhpresse eine relativ große, aufwendige TAD-Einheit vorgesehen (TAD = Through Air Drying).In a tissue machine known from WO 97/03247, instead of a shoe press, a relatively large, complex TAD unit is provided (TAD = Through Air Drying).

Die WO 99/10597 zeigt eine Tissuepapiermaschine mit einer Saugpresswalze mit zugeordneter Überdruckhaube. Die in dieser Druckschrift gezeigte Maschine weist keine Schuhpresse auf.WO 99/10597 shows a tissue paper machine with a suction press roll with associated overpressure hood. The machine shown in this document has no shoe press.

Ziel der Erfindung ist es, eine verbesserte Vorrichtung sowie ein verbessertes Verfahren der eingangs genannten Art anzugeben, mit denen der Trockengehalt der Tissuebahn sowohl volumenschonend als auch kostengünstig weiter erhöht und entsprechend die Herstellung von Tissue wirtschaftlicher gestaltet werden kann.The aim of the invention is to provide an improved device and an improved method of the type mentioned, with which the dry content of the tissue web both volume-saving and cost-effectively increased and, accordingly, the production of tissue can be made more economical.

Hinsichtlich der Maschine wird diese Aufgabe erfindungsgemäß dadurch gelöst, dass als Überdruckfluid für die Haube überhitzter Dampf und / oder trockene Heißluft vorgesehen ist.With regard to the machine, this object is achieved in that is provided as the overpressure fluid for the hood superheated steam and / or dry hot air.

Durch die unter Überdruck stehende Haube, bei der es sich insbesondere um eine kleinere Haube handeln kann, wird die Unterdruckwirkung der besaugten Einrichtung unterstützt, was die Lauffähigkeit der Tissuebahn insbesondere bei höheren Geschwindigkeiten verbessert. So ist eine solche Haube insbesondere dort mit Vorteil einsetzbar, wo die Geschwindigkeiten größer als etwa 1800 m/min, vorzugsweise größer als etwa 2000 m/min und insbesondere größer als etwa 2200 m/min sind.By standing under pressure hood, which may in particular be a smaller hood, the negative pressure effect of the evacuated device is supported, which improves the running ability of the tissue web, especially at higher speeds. Thus, such a hood is particularly advantageous where the speeds are greater than about 1800 m / min, preferably greater than about 2000 m / min and in particular greater than about 2200 m / min.

Die durch das Überdruckfluid bewirkte Erwärmung der Faserstoffbahn trägt wesentlich zur Steigerung der Entwässerungsleistung im folgenden, verlängerten Preßspalt bei. Der Dampf und die trockene Heißluft intensivieren außerdem noch die Trocknung im Bereich der besaugten Einrichtung.The heating of the fibrous web caused by the overpressure fluid contributes substantially to the increase of the dewatering performance in the following extended press nip. The steam and the dry hot air also intensify the drying in the area of the evacuated device.

Vorzugsweise umfasst die besaugte Einrichtung eine Saugwalze.Preferably, the evacuated means comprises a suction roll.

Von Vorteil ist, wenn zwischen der besaugten Einrichtung und der Schuhpresse zusätzlich ein Saugelement vorgesehen ist. Dadurch wird der Trockengehalt weiter gesteigert, da durch dieses zusätzliche Saugelement das durch die Kapillarwirkung bedingte Rückströmen des Wassers vom Trägerband in die Tissuebahn verhindert wird. Dieses Saugelement kann insbesondere einen Saugkasten umfassen.It is advantageous if a suction element is additionally provided between the evacuated device and the shoe press. As a result, the dry content is further increased, as is prevented by this additional suction element caused by the capillary backflow of water from the carrier tape in the tissue web. This suction element may in particular comprise a suction box.

Die Schuhpreßeinheit weist vorteilhafterweise zumindest quer zur Bahnlaufrichtung mehrere unabhängig voneinander ansteuerbare Preßzonen auf.The shoe press unit advantageously has at least transversely to the web running direction a plurality of independently controllable pressing zones.

Bei einer zweckmäßigen praktischen Ausführungsform ist der Trockenzylinder als Tissue- oder Yankee-Trockenzylinder vorgesehen, von dem die Faserstoffbahn nach erfolgter Trocknung vorzugsweise mittels eines Kreppschabers abschabbar ist.In an expedient practical embodiment of the drying cylinder is provided as a tissue or Yankee drying cylinder, of which the fibrous web after drying is preferably abschabbar by means of a creping doctor.

Von Vorteil ist, wenn das Trägerband in einem Formerteil zur Aufnahme der Faserstoffsuspension aus einem Stoffauflauf vorgesehen ist.It is advantageous if the carrier tape is provided in a former part for receiving the pulp suspension from a headbox.

Dabei ist das Trägerband zweckmäßigerweise als Innenband über eine Formierwalze oder dergleichen geführt, über die zumindest ein endloses Außensieb geführt ist.The carrier tape is expediently guided as an inner band via a forming roller or the like, is guided over the at least one endless outer screen.

Bei einer zweckmäßigen praktischen Ausführungsform der erfindungsgemäßen Maschine ist als Träger- bzw. Innenband ein Filzband vorgesehen.In a practical practical embodiment of the machine according to the invention as a carrier or inner band, a felt belt is provided.

Es ist somit insbesondere eine Ausführung als Crescentformer mit als Filzband vorgesehenem Innensieb möglich. Die Verwendung eines zusätzlichen, zwischen der besaugten Einrichtung und der Schuhpresse angeordneten Saugelements ist insbesondere bei einer solchen Anordnung von Vorteil.It is thus possible in particular an embodiment as a Crescentformer with intended as a felt belt inner wire. The use of an additional, arranged between the evacuated device and the shoe press Saugelements is particularly in such an arrangement of advantage.

Bei einer anderen zweckmäßigen Ausführungsform ist als Träger- bzw. Innenband ein Siebband, z.B. ein Entwässerungsband, vorgesehen. In diesem Fall ist zusammen mit der Faserstoffbahn und dem Trägerband vorzugsweise zusätzlich ein zwischen dem Trägerband und der Schuhpresseinheit angeordnetes endloses Filzband durch den verlängerten Preßspalt geführt, wodurch Markierungen verhindert und die Entwässerung gefördert wird, oder auch gezielt erzeugt werden, besonders dann, wenn das Trägerband ein Markierungsband (imprinting wire or felt) ist.In another expedient embodiment, the carrier or inner band is a screen belt, e.g. a drainage tape provided. In this case, together with the fibrous web and the carrier belt, preferably, an endless felt belt disposed between the carrier belt and the shoe press unit is additionally guided through the extended press nip, thereby preventing marks and promoting dewatering, or even selectively, especially when the carrier web is a marking tape (imprinting wire or felt).

Die Schuhpreßeinheit ist vorzugsweise mit einem wasserundurchlässigen umlaufenden endlosen Preßband versehen. Dabei kann die Schuhpreßeinheit insbesondere durch eine Schuhpreßwalze mit einem vorzugsweise wasserundurchlässigen Preßmantel gebildet sein.The shoe press unit is preferably provided with a water-impermeable circulating endless press belt. In this case, the Schuhpreßeinheit can be formed in particular by a shoe press roll with a preferably water-impermeable press jacket.

Im übrigen kann die Schuhpresse insbesondere so ausgeführt sein, wie dies in der DE-A-99 125 789.0 beschrieben ist.Moreover, the shoe press may in particular be designed as described in DE-A-99 125 789.0.

Das erfindungsgemäße Verfahren ist entsprechend dadurch gekennzeichnet, dass als Überdruckfluid für die Haube überhitzter Dampf und oder trockene Heißluft verwendet wird.The method according to the invention is accordingly characterized in that overheated steam and / or dry hot air is used as the overpressure fluid for the hood.

Weitere vorteilhafte Ausgestaltungen des erfindungsgemäßen Verfahrens sind in den Unteransprüchen angegeben.Further advantageous embodiments of the method according to the invention are specified in the subclaims.

Die erfindungsgemäße Anordnung sowie das erfindungsgemäße Verfahren können insbesondere in Tissuemaschinenen verschiedener Ausführungen eingesetzt werden, z.B. für Saugbrustwalzenformer, Doppelsiebformer, Crescentformer, Langsiebe, usw. Überdies ist eine Kombination mit "Through Air Drying"-Konzepten von Vorteil.The arrangement according to the invention and the method according to the invention can be used in particular in tissue machines of various designs, e.g. for suction breast roll former, twin wire former, crescent former, wire mesh, etc. Moreover, a combination with "through air drying" concepts is advantageous.

Die Erfindung wird im folgenden anhand von Ausführungsbeispielen unter Bezugnahme auf die Zeichnung näher erläutert; in dieser zeigen:

Figur 1
eine schematische Teildarstellung einer als Crescentformer ausgeführten, mit einem inneren Filzband versehenen Maschine zur Herstellung einer Tissue- oder Hygienepapierbahn und
Figur 2
eine schematische Teildarstellung einer mit einem Innensieb versehenen Maschine zur Herstellung einer Tissue- oder Hygienepapierbahn.
The invention is explained in more detail below with reference to embodiments with reference to the drawing; in this show:
FIG. 1
a partial schematic representation of a designed as Crescentformer, provided with an inner felt belt machine for producing a tissue or tissue paper web and
FIG. 2
a schematic partial view of a provided with an inner wire machine for producing a tissue or tissue paper web.

Figur 1 zeigt in schematischer Teilansicht eine als Crescentformer ausgeführte Maschine 10 zur Herstellung einer Faserstoffbahn 12, bei der es sich insbesondere um eine Tissue- oder Hygienepapierbahn handeln kann.FIG. 1 shows, in a schematic partial view, a machine 10 designed as a crescent former for producing a fibrous web 12, which may in particular be a tissue or tissue paper web.

Dabei sind über einen Bereich einer sogenannten Formierwalze 14 gemeinsam ein endloses Innen- oder Trägerband 16 und ein endloses Außensieb 18 geführt. Wie anhand der Figur 1 zu erkennen ist, ist der Umschlingungswinkel bezüglich des Außensiebes 18 geringer als der bezüglich des innenliegenden Trägerbandes 16.In this case, an endless inner or carrier tape 16 and an endless outer wire 18 are guided over a region of a so-called forming roller 14 together. As can be seen from FIG. 1, the wrap angle with respect to the outer screen 18 is smaller than that with respect to the inner carrier strip 16.

In den zwischen dem Trägerband 16 und dem Außensieb 18 gebildeten Einlaufspalt 20 wird mittels eines Stoffauflaufs 22 die Faserstoffsuspension eingebracht. Die sich dabei bildende Faserstoffbahn 12 wird nach dem Umschlingungsbereich der Formierwalze 14 gemeinsam mit dem Trägerband 16 einem in Bahnlaufrichtung L verlängerten Preßspalt 24 zugeführt.In the inlet gap 20 formed between the carrier tape 16 and the outer wire 18 is introduced by means of a headbox 22, the pulp suspension. The thereby forming fibrous web 12 is supplied to the wrapping region of the forming roller 14 together with the carrier tape 16 a lengthened in the web running direction L press nip 24.

Vor Erreichen des verlängerten Preßspaltes 24 umschlingt das die Faserstoffbahn 12 mit sich führende Trägerband 16 eine hier als Saugwalze 26 ausgeführte besaugte Einrichtung. Die Saugwalze 26 entfernt einen wesentlichen Teil des Wassers aus dem Trägerband 16 und eventuell sogar etwas aus der außenliegenden Faserstoffbahn 12.Before reaching the extended press nip 24, the fibrous web 12 carrying carrier tape 16 wraps around here designed as a suction roller 26 evacuated device. The suction roll 26 removes a substantial portion of the water from the carrier belt 16 and possibly even somewhat from the outer fibrous web 12.

Beim vorliegenden Ausführungsbeispiel ist das Trägerband 16 als Filzband vorgesehen.In the present embodiment, the carrier tape 16 is provided as a felt belt.

Durch die Saugwalze 26 wird die Wasseraufnahmefähigkeit des Trägerbandes 16 erhöht, so daß es im folgenden verlängerten Preßspalt 24, durch den es gemeinsam mit der Faserstoffbahn 12 läuft, das ausgepreßte Wasser aufnehmen kann.By the suction roller 26, the water absorption capacity of the carrier tape 16 is increased, so that it in the following extended press nip 24, through which it runs together with the fibrous web 12, can absorb the squeezed out water.

Die Unterdruckwirkung dieser Saugwalze 26 wird durch eine der Saugwalze 26 zugeordnete, unter Überdruck stehende Haube 28 unterstützt. Dabei genügt in der Regel eine kleine Haube. Im vorliegenden Fall ist das Trägerband 16 zusammen mit der Faserstoffbahn 12 über die Saugwalze 26 geführt, wobei die Faserstoffbahn 12 außen liegt.The negative pressure effect of this suction roller 26 is supported by a suction roller 26 associated, under pressure hood 28. As a rule, a small hood is sufficient. In the present case, the carrier tape 16 is guided together with the fibrous web 12 on the suction roller 26, wherein the fibrous web 12 is on the outside.

Als Überdruckfluid für die Haube 28 ist überhitzter Dampf und/oder trockene Heißluft vorgesehen.As overpressure fluid for the hood 28 superheated steam and / or dry hot air is provided.

Durch diese Anordnung wird die Entwässerung derart intensiviert, daß man mit nur einem Preßspalt 24 auskommt.By this arrangement, the drainage is intensified so that you can make do with only one press nip 24.

Die den verlängerten Preßspalt 24 bildende Schuhpresse 30 umfaßt einen als Tissue- oder Yankee-Trockenzylinder dienenden Trockenzylinder 32 und eine Schuhpreßeinheit 34 mit wenigstens einem Preßschuh 36 und einem über diesen geführten umlaufenden endlosen Preßband 38. Im vorliegenden Fall ist die Schuhpreßeinheit 34 durch eine Schuhpreßwalze mit einem flexiblen, vorzugsweise wasserundurchlässigen Preßmantel 38 gebildet.The shoe press 30 forming the extended press nip 24 comprises a drying cylinder 32 serving as a tissue or Yankee drying cylinder and a shoe pressing unit 34 having at least one press shoe 36 and a continuous endless press belt 38 guided over it. In the present case, the shoe press unit 34 is provided with a shoe press roll a flexible, preferably water-impermeable press jacket 38 is formed.

Der Preßschuh 36 besitzt eine zumindest im wesentlichen konkave Anpreßfläche 40. Die Anpressung kann beispielsweise hydraulisch erfolgen. Der Bereich zwischen dem flexiblen Preßmantel 38 und dem Preßschuh 36 kann insbesondere hydrostatisch und/oder hydrodynamisch geschmiert sein.The press shoe 36 has an at least substantially concave contact surface 40. The contact pressure can be effected, for example, hydraulically. The region between the flexible press jacket 38 and the press shoe 36 can be lubricated in particular hydrostatically and / or hydrodynamically.

Die Schuhpreßeinheit 34 besitzt vorzugsweise quer zur Bahnlaufrichtung L mehrere unabhängig voneinander ansteuerbare Preßzonen, wodurch eine Anpassung an die Durchbiegung des Trockenzylinders 32 sowie die Einstellung eines gewünschten Preßdruckprofils quer zur Bahnlaufrichtung L möglich ist.The shoe press unit 34 preferably has transversely to the web running direction L a plurality of independently controllable pressing zones, whereby a Adaptation to the deflection of the drying cylinder 32 and the setting of a desired pressing pressure profile transverse to the web running direction L is possible.

Der in Bahnlaufrichtung L verlaufende Preßspalt 24 ermöglicht eine intensive und dennoch volumenschonende Entwässerung der Faserstoffbahn 12.The running in the running direction L press nip 24 allows intensive and yet volume-saving drainage of the fibrous web 12th

Nach dem verlängerten Preßspalt 24 läuft die Faserstoffbahn 12 am beheizten Trockenzylinder 32 entlang. Die Trocknung wird in diesem Umschlingungsbereich noch durch eine Trockenhaube 42 verstärkt, die heiße, trockene Luft auf die Faserstoffbahn 12 bläst und wieder absaugt.After the extended press nip 24, the fibrous web 12 runs along the heated drying cylinder 32. The drying is reinforced in this looping area by a drying hood 42, the hot, dry air blows on the fibrous web 12 and sucks again.

Nach erfolgter Trocknung wird die Faserstoffbahn 12 über einen Kreppschaber 44 vom Trockenzylinder 32 entfernt. Die gekreppte Faserstoffbahn 12 kann im Anschluß daran weiter bearbeitet und aufgewickelt werden.After drying, the fibrous web 12 is removed by a creping doctor 44 from the drying cylinder 32. The creped fibrous web 12 can subsequently be further processed and wound up.

Im vorliegenden Fall ist zwischen der Saugwalze 26 und der Schuhpresse 30 ein zusätzliches Saugelement vorgesehen, das beispielsweise durch einen Saugkasten 46 oder dergleichen gebildet sein kann. Durch diesen zusätzlichen Saugkasten 46 wird der Trockengehalt weiter gesteigert, da damit das durch die Kapillarwirkung bedingte Rückströmen des Wassers vom Trägerband 16 in die Faserstoffbahn 12 verhindert wird.In the present case, an additional suction element is provided between the suction roller 26 and the shoe press 30, which may be formed for example by a suction box 46 or the like. By this additional suction box 46, the dry content is further increased because it prevents the capillary caused by the backflow of water from the carrier tape 16 into the fibrous web 12.

Figur 2 zeigt in schematischer Teildarstellung eine weitere Ausführungsform einer Maschine 10 zur Herstellung einer Faserstoffbahn 12, bei der es sich insbesondere wieder um eine Tissue- oder Hygienepapierbahn handeln kann.FIG. 2 shows, in a schematic partial representation, a further embodiment of a machine 10 for producing a fibrous web 12, in which again, it may be a tissue or tissue paper web.

Diese Ausführungsform unterscheidet sich von der gemäß Figur 1 zunächst dadurch, daß als Träger- bzw. Innenband 16 anstatt eines Filzbandes ein Siebband, z.B. ein Entwässerungsband, vorgesehen ist. In diesem Fall ist zusammen mit der Faserstoffbahn 12 und dem Trägerband 16 zusätzlich ein zwischen dem Trägerband 16 und der Schuhpreßeinheit 34 angeordnetes endloses Filzband 48 durch den verlängerten Preßspalt 24 geführt, um Markierungen zu verhindern und die Entwässerung zu fördern, oder auch gezielt erzeugt werden, besonders dann, wenn das Trägerband ein Markierungsband (imprinting wire or felt) ist.This embodiment differs from that according to FIG. 1 firstly in that, as the carrier or inner band 16, instead of a felt belt, a screen belt, e.g. a drainage tape is provided. In this case, together with the fibrous web 12 and the carrier tape 16, an endless felt belt 48 arranged between the carrier belt 16 and the shoe press unit 34 is additionally guided through the extended press nip 24 in order to prevent marks and to promote dewatering, or else to be generated selectively. especially if the carrier tape is an imprinting wire or felt.

Das bei der Ausführungsform gemäß Figur 1 zwischen der Saugwalze 26 und der Schuhpresse 30 vorgesehene zusätzliche Saugelement 46 ist im vorliegenden Fall weggelassen.The additional suction element 46 provided in the embodiment according to FIG. 1 between the suction roll 26 and the shoe press 30 has been omitted in the present case.

Im übrigen besitzt die in der Figur 2 dargestellte Ausführungsform zumindest im wesentlichen den gleichen Aufbau wie die der Figur 1. Einander entsprechenden Teilen sind gleiche Bezugszeichen zugeordnet.Moreover, the embodiment shown in Figure 2 has at least substantially the same structure as that of Figure 1. Parts corresponding to each other are assigned the same reference numerals.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Maschinemachine
1212
FaserstoffbahnFibrous web
1414
Formierwalzeforming roll
1616
endloses Innen- oder Trägerbandendless inner or carrier tape
1818
endloses Ausßensiebendless sieve
2020
Einlaufspaltinlet gap
2222
Stoffauflaufheadbox
2424
verlängerter Preßspaltextended press nip
2626
Saugwalzesuction roll
2828
ÜberdruckhaubePressure hood
3030
Schuhpresseshoe press
3232
Trockenzylinderdrying cylinders
3434
Schuhpreßeinheitshoe press
3636
Preßschuhpress shoe
3838
Preßmantelpress jacket
4040
konkave Anpreßflächeconcave contact surface
4242
TrockenhaubeTrockenhaube
4444
Kreppschabercreping
4646
Saugkastensuction box
4848
FilzbandFilzband
LL
BahnlaufrichtungWeb direction

Claims (30)

  1. Machine (10) for making a fibrous web (12), in particular a tissue or hygienic paper web, having at least one shoe press (30) comprising a drying cylinder (32) and a shoe press unit (34) for forming a press nip (24) extended in the web running direction (L), the fibrous web (12), together with a water-permeable endless carrier belt (16), being led through the extended press nip (24) and, before the shoe press (30) in the web running direction (L), the carrier belt (16) being led over at least one evacuated device (26) together with the fibrous web (12), the carrier belt (16) being located between the fibrous web (12) and the evacuated device (26), and the evacuated device (26) being assigned a hood (28) that is under a positive pressure in order to assist the vacuum action of the evacuated device (26), characterized in that the positive pressure fluid provided for the hood (28) is superheated steam and/or dry hot air.
  2. Machine according to Claim 1, characterized in that the evacuated device (26) comprises a suction roll (26).
  3. Machine according to Claim 1 or 2, characterized in that a suction element (46) is provided between the evacuated device (26) and the shoe press (30).
  4. Machine according to Claim 3, characterized in that the suction element comprises a suction box (46).
  5. Machine according to one of the preceding claims, characterized in that, at least transversely with respect to the web running direction (L), the shoe press unit (34) has a plurality of pressing zones that can be activated independently of one another.
  6. Machine according to one of the preceding claims, characterized in that the drying cylinder (32) is provided as a tissue or Yankee drying cylinder, from which the fibrous web (12) can be doctored off, preferably by means of a creping doctor (44), after drying has been carried out.
  7. Machine according to one of the preceding claims, characterized in that the carrier belt (16) is provided in a former part to pick up the fibrous stock suspension from a headbox (22).
  8. Machine according to Claim 7, characterized in that the carrier belt (16) is led as an inner belt over a forming roll (14), over which an endless outer fabric (18) is additionally led.
  9. Machine according to one of the preceding claims, characterized in that the carrier or inner belt (16) provided is a felt belt.
  10. Machine according to one of Claims 1 to 8, characterized in that the carrier or inner belt (16) provided is a wire mesh belt.
  11. Machine according to one of the preceding claims, characterized in that the carrier or inner belt (16) provided is a dewatering belt.
  12. Machine according to one of the preceding claims, characterized in that the carrier or inner belt (16) provided is a marking belt.
  13. Machine according to one of the preceding claims, characterized in that, together with the fibrous web (12) and the carrier belt (16), an endless felt belt (48) arranged between the carrier belt (16) and the shoe press unit (34) is additionally led through the extended press nip (24).
  14. Machine according to one of the preceding claims, characterized in that the shoe press unit (34) is provided with a water-impermeable circulating endless press belt (38).
  15. Machine according to one of Claims 1 to 13, characterized in that the shoe press unit (34) is formed by a shoe press roll having a preferably water-impermeable press cover (38).
  16. Process for making a fibrous web (12), in particular a tissue or hygienic paper web, in which the fibrous web (12), together with a water-permeable endless carrier belt (16), is led through at least one extended press nip (24) of a shoe press (30) comprising a drying cylinder (32) and a shoe press unit (34) and, before the shoe press (30) in the web running direction (L), the carrier belt (16) is led over at least one evacuated device (26) together with the fibrous web (12), the carrier belt (16) being located between the fibrous web (12) and the evacuated device (26), and the vacuum action of the evacuated device (26) being assisted by a hood (28) that is under a positive pressure and is assigned to the evacuated device (26), characterized in that the positive pressure fluid used for the hood (28) is superheated steam and/or dry hot air.
  17. Process according to Claim 16, characterized in that the evacuated device (26) used is a suction roll (26).
  18. Process according to Claim 16 or 17, characterized in that a suction element (46) is inserted between the evacuated device (26) and the shoe press (30).
  19. Process according to Claim 18, characterized in that the suction element (46) used is a suction box (46).
  20. Process according to one of Claims 16 to 19, characterized in that a shoe press unit (34) is used which, at least transversely with respect to the web running direction, has a plurality of pressing zones that can be activated independently of one another.
  21. Process according to one of Claims 16 to 20, characterized in that the drying cylinder (32) used is a tissue or Yankee drying cylinder, from which the fibrous web (12) is doctored off, preferably by means of a creping doctor (44), after drying has been carried out.
  22. Process according to one of Claims 16 to 21, characterized in that the carrier belt (16) is used in a former part to pick up the fibrous stock suspension from a headbox (22).
  23. Process according to Claim 22, characterized in that the carrier belt (16) is led as an inner belt over a forming roll (14), over which an endless outer fabric (18) is additionally led.
  24. Process according to one of Claims 16 to 23, characterized in that the carrier or inner belt (16) used is a felt belt.
  25. Process according to one of Claims 16 to 23, characterized in that the carrier or inner belt (16) used is a wire mesh belt.
  26. Process according to one of Claims 16 to 25, characterized in that the carrier or inner belt (16) used is a dewatering belt.
  27. Process according to one of Claims 16 to 26, characterized in that the carrier or inner belt (16) used is a marking belt.
  28. Process according to one of Claims 16 to 27, characterized in that, together with the fibrous web (12) and the carrier belt (16), an endless felt belt (48) arranged between the carrier belt (16) and the shoe press unit (34) is additionally led through the extended press nip (24).
  29. Process according to one of Claims 16 to 28, characterized in that a shoe press unit (34) having a water-impermeable circulating endless press belt (38) is used.
  30. Process according to one of Claims 16 to 27, characterized in that the shoe press unit (34) used is a shoe press roll having a preferably water-impermeable press cover (38).
EP01107708A 2000-07-03 2001-03-30 Process and apparatus for making a fibrous web Expired - Lifetime EP1176250B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10032251A DE10032251A1 (en) 2000-07-03 2000-07-03 Water extraction station for a web of tissue/toilet paper has a shoe press unit at the drying cylinder with an extended press gap and a suction unit within an overpressure hood at the carrier belt
DE10032251 2000-07-07

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EP1176250A2 EP1176250A2 (en) 2002-01-30
EP1176250A3 EP1176250A3 (en) 2003-09-17
EP1176250B1 true EP1176250B1 (en) 2006-12-20

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EP (1) EP1176250B1 (en)
AT (1) ATE348914T1 (en)
BR (1) BR0104347B1 (en)
CA (1) CA2352016C (en)
DE (2) DE10032251A1 (en)
PL (1) PL197138B1 (en)

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DE10032251A1 (en) 2002-01-17
ATE348914T1 (en) 2007-01-15
US6780282B2 (en) 2004-08-24
CA2352016A1 (en) 2002-01-03
BR0104347B1 (en) 2011-05-17
EP1176250A3 (en) 2003-09-17
PL197138B1 (en) 2008-03-31
EP1176250A2 (en) 2002-01-30
BR0104347A (en) 2002-02-13
DE50111670D1 (en) 2007-02-01
US20020060046A1 (en) 2002-05-23
CA2352016C (en) 2010-09-21
PL348345A1 (en) 2002-01-14

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