EP1418271A1 - Apparatus for detaching a paper web from a wire - Google Patents

Apparatus for detaching a paper web from a wire Download PDF

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Publication number
EP1418271A1
EP1418271A1 EP20030025273 EP03025273A EP1418271A1 EP 1418271 A1 EP1418271 A1 EP 1418271A1 EP 20030025273 EP20030025273 EP 20030025273 EP 03025273 A EP03025273 A EP 03025273A EP 1418271 A1 EP1418271 A1 EP 1418271A1
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EP
European Patent Office
Prior art keywords
felt
wire
paper web
separation point
web
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20030025273
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German (de)
French (fr)
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EP1418271B1 (en
Inventor
Harald Weigant
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Andritz AG
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Andritz AG
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Filing date
Publication date
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Priority to SI200330718T priority Critical patent/SI1418271T1/en
Publication of EP1418271A1 publication Critical patent/EP1418271A1/en
Application granted granted Critical
Publication of EP1418271B1 publication Critical patent/EP1418271B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F2/00—Transferring continuous webs from wet ends to press sections
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/006—Cutting the edges of the paper-web
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/444—Tool engages work during dwell of intermittent workfeed
    • Y10T83/463—Work-feed element contacts and moves with work
    • Y10T83/4632—Comprises a work-moving gripper

Definitions

  • the invention relates to a device for detaching a paper web from a sieve, the pulp suspension through a headbox is inserted between a sieve and a felt, sieve and felt together passed over a forming roller and after the web formation from each other be separated.
  • the invention now wants the disadvantage of the systems of the prior art Improve technology and exact separation even at relatively low Felt tension and large machine widths and / or high machine speeds achieve, the quality of the paper web being high should stay.
  • the separation point as a suction roll with a vacuum chamber is executed, it can also be designed as a suction shoe.
  • At the separation point of the sieve and felt at least one, in particular movable web cutting device, in particular edge spray nozzle (s) or rubber rubber nozzle (s), is (are) provided at the same time an exact cut without influencing the formation of the railway can be achieved.
  • the web cutting device can also between the forming roller and the separation point of the screen and felt on the web his.
  • the web cutting device can in machine longitudinal and / or transverse direction can be made movable.
  • FIG. 1 shows a system according to the prior art
  • FIG. 2 shows a system with the device according to the invention
  • Fig. 3 a detail Fig. 2
  • Fig. 4 shows a detail from Fig. 3
  • Fig. 5 shows an alternative embodiment represents the invention.
  • Fig. 1 shows a section of the wet part of a paper machine for example for the production of tissue paper.
  • the wet end exists from a twin wire former 1 and a headbox 2.
  • the twin wire former 1 is a crescent former with a forming roller 3, a sieve 4 and a felt 5 shown.
  • Sieve 4 and felt 5 run together over the Forming roller 3.
  • Sieve 4 is over a breast roller 6 and after separation guided over a guide roller 7, which is at a short distance from the forming roller 3 is arranged.
  • the felt 5 is separated from the sieve 4 guided together with the paper web 9 formed over a roller 8.
  • FIG. 2 shows a system with the device according to the invention, analog parts with the same reference numerals as in FIG. 1 are designated.
  • Sieve 4 the felt 5 and the intermediate paper web 9 still taken off the forming roller together and a stretch run together. The separation takes place only at the separation point 10.
  • the circumference of the forming roller can be used longer or At higher machine speeds, the same formation times can be achieved can be achieved, which means even at higher machine speeds the quality of the paper web is preserved.
  • a suction shoe 11 is provided here.
  • spray pipes 12 for high pressure water for cutting the edge strips and the Performance strip recognizable.
  • FIG. 3 shows the detail in circle III in FIG. 2.
  • the screen 4 continues to run over a deflection roller 7 Felt 5 and paper web 9 are continued via a deflection roller 8.
  • the suction shoe 11 is connected to a suction pipe 13 and with Openings 14, in particular one running transverse to the web running direction Slot, equipped. Should the edge strip or the lead strip are cut off here, nozzles 12 are used, the Beam is directed into the slot 14 so that any moistening of the Paper web 9 can be avoided and the water discharged in a targeted manner can be.
  • the beam can also be directed in front of the slot 14. It can of course also have two suction slots 14 arranged one behind the other be provided, thereby dividing the spray water particularly well and the suction of the paper web on the felt can be achieved can.
  • FIG. 5 shows an alternative embodiment of the invention.
  • a suction roller 15 with a vacuum chamber 16 used.
  • the advantage of this variant is the possibility of longer a vacuum acts on the felt and thus also on the paper web to let. This can increase the security of paper transfer onto the felt still be increased.
  • the invention is not limited by the embodiments shown. So the high pressure nozzle can also be moved as a so-called Gautschknecht can be arranged to when performing the paper web First create a strip that then extends across the entire width of the paper web is expanded. Also the suction roller or the suction shoe analog devices for separation conceivable.

Landscapes

  • Paper (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Replacement Of Web Rolls (AREA)
  • Basic Packing Technique (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)

Abstract

A paper web-wire detaching device comprises a separation point (10) of wire (4) and felt (5) located at a distance from the forming roll (3). A pump suspension is fed between a wire and a felt by a headbox (2). The wire and felt are guided together over a forming roll, and are separated from one another after the paper web (9) has been formed.

Description

Die Erfindung betrifft eine Vorrichtung zum Ablösen einer Papierbahn von einem Sieb, wobei die Faserstoffsuspension durch einen Stoffauflauf zwischen ein Sieb und einen Filz eingebracht wird, Sieb und Filz gemeinsam über eine Formierwalze geführt und nach der Bahnbildung voneinander getrennt werden.The invention relates to a device for detaching a paper web from a sieve, the pulp suspension through a headbox is inserted between a sieve and a felt, sieve and felt together passed over a forming roller and after the web formation from each other be separated.

Eine derartige Vorrichtung ist z.B. beschrieben in der US 5,908,534. Bei Verlassen der Walze werden Sieb und Filz auseinandergeführt, wobei die Papierbahn am Filz bleibt und weiter zur Trocknungsanlage geführt wird. Der Nachteil der Anordnung ist, dass insbesondere bei hohen Maschinengeschwindigkeiten oder großen Bahnbreiten der Filz nach der Trennung durchhängt und es so zu Schäden an der Papierbahn kommt. Auch wird die Papierbahn nicht immer vollständig vom Sieb gelöst. Dadurch kommt es einerseits zur Verschmutzung des Siebes und andererseits auch zu wiederholten Abrissen der Papierbahn.Such a device is e.g. described in US 5,908,534. at Leaving the roller, the screen and felt are moved apart, the Paper web remains on the felt and is led to the drying plant. The disadvantage of the arrangement is that especially at high machine speeds or large web widths of the felt after separation slack and damage to the paper web occurs. Also will the paper web is not always completely detached from the screen. It comes it on the one hand to contaminate the sieve and on the other hand too repeated tearing of the paper web.

Die Erfindung will nun den Nachteil der Anlagen nach dem Stand der Technik verbessern und eine exakte Trennung auch bei relativ geringer Filzspannung und großen Maschinenbreiten und/oder hohen Maschinengeschwindigkeiten erreichen, wobei die Qualität der Papierbahn hoch bleiben soll.The invention now wants the disadvantage of the systems of the prior art Improve technology and exact separation even at relatively low Felt tension and large machine widths and / or high machine speeds achieve, the quality of the paper web being high should stay.

Dies wird erfindungsgemäß dadurch erreicht, dass die Trennstelle von Sieb und Filz im Abstand von der Formierwalze angeordnet ist. Dadurch kann immer eine optimale Filzspannung bei gleichzeitig exakter Trennung erreicht werden.This is achieved according to the invention in that the separation point of Sieve and felt is arranged at a distance from the forming roller. Thereby can always achieve an optimal felt tension with exact separation can be achieved.

Vorteilhaft ist es, wenn die Trennstelle als Saugwalze mit Vakuumkammer ausgeführt ist, wobei sie auch als Saugschuh ausgeführt sein kann.It is advantageous if the separation point as a suction roll with a vacuum chamber is executed, it can also be designed as a suction shoe.

Bei einer Ausführung als Saugschuh hat es sich als günstig erwiesen, wenn der Saugschuh einen, vorteilhaft mehrerer, insbesondere zwei Saugschlitze aufweist.When running as a suction shoe, it has proven to be advantageous if the suction shoe one, advantageously several, in particular two Has suction slots.

Wenn zusätzlich bei der Trennstelle von Sieb und Filz zumindest eine, insbesondere verfahrbare, Bahnschneideinrichtung, insbesondere Randspritzdüse(n) oder Gautschknechtdüse(n), vorgesehen ist (sind), kann gleichzeitig ein exakter Schnitt ohne Beeinflussung der Formation der Bahn erzielt werden. Die Bahnschneideinrichtung kann auch zwischen der Formierwalze und der Trennstelle von Sieb und Filz an der Bahn vorgesehen sein. Die Bahnschneideinrichtung kann dabei in Maschinenlängsund/oder -querrichtung verfahrbar ausgeführt sein.If, at the separation point of the sieve and felt, at least one, in particular movable web cutting device, in particular edge spray nozzle (s) or rubber rubber nozzle (s), is (are) provided at the same time an exact cut without influencing the formation of the Railway can be achieved. The web cutting device can also between the forming roller and the separation point of the screen and felt on the web his. The web cutting device can in machine longitudinal and / or transverse direction can be made movable.

Die Erfindung wird nun anhand der Zeichnungen beispielhaft beschrieben, wobei Fig. 1 eine Anlage nach dem Stand der Technik, Fig. 2 eine Anlage mit der erfindungsgemäßen Vorrichtung und Fig. 3 einen Ausschnitt aus Fig. 2, Fig. 4 eine Detail aus Fig. 3 und Fig. 5 eine alternative Ausgestaltung der Erfindung darstellt.The invention will now be described by way of example with reference to the drawings, 1 shows a system according to the prior art, FIG. 2 shows a system with the device according to the invention and Fig. 3 a detail Fig. 2, Fig. 4 shows a detail from Fig. 3 and Fig. 5 shows an alternative embodiment represents the invention.

Fig. 1 zeigt einen Ausschnitt aus dem Nassteil einer Papiermaschine beispielsweise zur Erzeugung von Tissuepapier. Die Nasspartie besteht aus einem Doppelsiebformer 1 und einem Stoffauflauf 2. Der Doppelsiebformer 1 ist als Crescentformer mit einer Formierwalze 3, einem Sieb 4 und einem Filz 5 dargestellt. Sieb 4 und Filz 5 laufen gemeinsam über die Formierwalze 3. Sieb 4 ist über eine Brustwalze 6 und nach der Trennung über eine Leitwalze 7 geführt, die in geringer Entfernung von der Formierwalze 3 angeordnet ist. Der Filz 5 wird nach Trennung vom Sieb 4 gemeinsam mit der gebildeten Papierbahn 9 über eine Walze 8 geführt. Bei derartigen Anlagen besteht die Gefahr, dass es bei geringer Filzspannung oder bei großen Geschwindigkeiten bzw. großen Maschinenbreiten immer wieder zum Durchhängen des Filzes 5 und damit zu ungleichmäßigem Kontakt zum Sieb 4 kommt, was zu Schäden an der Papierbahn bzw. auch zu Papierbahnrissen führt.Fig. 1 shows a section of the wet part of a paper machine for example for the production of tissue paper. The wet end exists from a twin wire former 1 and a headbox 2. The twin wire former 1 is a crescent former with a forming roller 3, a sieve 4 and a felt 5 shown. Sieve 4 and felt 5 run together over the Forming roller 3. Sieve 4 is over a breast roller 6 and after separation guided over a guide roller 7, which is at a short distance from the forming roller 3 is arranged. The felt 5 is separated from the sieve 4 guided together with the paper web 9 formed over a roller 8. In such systems, there is a risk that it is at low felt tension or at high speeds or large machine widths again and again to sag the felt 5 and thus too uneven contact to the sieve 4 comes, which damages the Paper web or also leads to paper web tears.

In Fig. 2 ist eine Anlage mit der erfindungsgemäßen Vorrichtung dargestellt, wobei analoge Teile mit den gleichen Bezugszeichen wie in Fig. 1 bezeichnet sind. Im Gegensatz zum Stand der Technik werden hier das Sieb 4, der Filz 5 und die dazwischenliegende Papierbahn 9 noch gemeinsam von der Formierwalze abgenommen und eine Strecke gemeinsam geführt. Erst bei der Trennstelle 10 erfolgt die Auftrennung. Dadurch kann der Umfang der Formierwalze länger genutzt werden bzw. bei höheren Maschinengeschwindigkeiten können gleiche Formierzeiten erreicht werden, wodurch auch bei den größeren Maschinengeschwindigkeiten die Qualität der Papierbahn erhalten bleibt. An der Trennstelle 10 ist hier ein Saugschuh 11 vorgesehen. Weiters sind Spritzrohre 12 für Hochdruckwasser zum Schneiden der Randstreifen und des Aufführstreifens erkennbar.2 shows a system with the device according to the invention, analog parts with the same reference numerals as in FIG. 1 are designated. In contrast to the state of the art, here Sieve 4, the felt 5 and the intermediate paper web 9 still taken off the forming roller together and a stretch run together. The separation takes place only at the separation point 10. As a result, the circumference of the forming roller can be used longer or At higher machine speeds, the same formation times can be achieved can be achieved, which means even at higher machine speeds the quality of the paper web is preserved. At the Separation point 10, a suction shoe 11 is provided here. There are also spray pipes 12 for high pressure water for cutting the edge strips and the Performance strip recognizable.

Fig. 3 zeigt den Ausschnitt im Kreis III in Fig. 2. Hier ist die Trennstelle 10 gut erkennbar. Das Sieb 4 läuft über eine Umlenkwalze 7 weiter, während Filz 5 und Papierbahn 9 über eine Umlenkwalze 8 weitergeführt werden. Der Saugschuh 11 ist mit einem Saugrohr 13 verbunden und mit Öffnungen 14, insbesondere einem quer zur Bahnlaufrichtung verlaufenden Schlitz, ausgestattet. Soll der Randstreifen oder der Aufführstreifen hier abgeschnitten werden, werden Düsen 12 eingesetzt, deren Strahl in den Schlitz 14 gerichtet ist, so dass jegliche Befeuchtung der Papierbahn 9 vermieden werden und das Wasser gezielt abgeführt werden kann. Der Strahl kann auch vor den Schlitz 14 gerichtet sein. Es können natürlich auch zwei hintereinander angeordnete Saugschlitze 14 vorgesehen sein, wobei dadurch besonders gut eine Aufteilung des Spritzwassers und der Ansaugung der Papierbahn an den Filz erreicht werden kann.FIG. 3 shows the detail in circle III in FIG. 2. Here is the separation point 10 good to see. The screen 4 continues to run over a deflection roller 7 Felt 5 and paper web 9 are continued via a deflection roller 8. The suction shoe 11 is connected to a suction pipe 13 and with Openings 14, in particular one running transverse to the web running direction Slot, equipped. Should the edge strip or the lead strip are cut off here, nozzles 12 are used, the Beam is directed into the slot 14 so that any moistening of the Paper web 9 can be avoided and the water discharged in a targeted manner can be. The beam can also be directed in front of the slot 14. It can of course also have two suction slots 14 arranged one behind the other be provided, thereby dividing the spray water particularly well and the suction of the paper web on the felt can be achieved can.

Fig. 4 zeigt nochmals die Trennstelle 10 im Detail. Hier ist besonders gut der Schlitz 14 im Saugschuh 11 erkennbar.4 again shows the separation point 10 in detail. Here is particularly good the slot 14 in the suction shoe 11 can be seen.

In Fig. 5 ist eine alternative Ausgestaltung der Erfindung dargestellt. Anstelle des Saugschuhs wird hier eine Saugwalze 15 mit einer Vakuumkammer 16 eingesetzt. Vorteil dieser Variante ist die Möglichkeit, länger ein Vakuum auf den Filz und somit auch die Papierbahn einwirken zu lassen. Dadurch kann die Sicherheit der Papierübernahme auf den Filz noch gesteigert werden.5 shows an alternative embodiment of the invention. Instead of the suction shoe there is a suction roller 15 with a vacuum chamber 16 used. The advantage of this variant is the possibility of longer a vacuum acts on the felt and thus also on the paper web to let. This can increase the security of paper transfer onto the felt still be increased.

Die Erfindung ist nicht durch die dargestellten Ausführungen beschränkt. So kann die Hochdruckdüse auch verfahrbar als sogenannter Gautschknecht angeordnet werden, um beim Aufführen der Papierbahn erst einen Streifen zu erzeugen, der dann auf die gesamte Papierbahnbreite erweitert wird. Auch sind der Saugwalze bzw. dem Saugschuh analoge Einrichtungen zur Trennung denkbar.The invention is not limited by the embodiments shown. So the high pressure nozzle can also be moved as a so-called Gautschknecht can be arranged to when performing the paper web First create a strip that then extends across the entire width of the paper web is expanded. Also the suction roller or the suction shoe analog devices for separation conceivable.

Claims (7)

Vorrichtung zum Ablösen einer Papierbahn von einem Sieb, wobei die Faserstoffsuspension durch einen Stoffauflauf zwischen ein Sieb und einen Filz eingebracht wird, Sieb und Filz gemeinsam über eine Formierwalze geführt und nach der Bahnbildung voneinander getrennt werden, dadurch gekennzeichnet, dass die Trennstelle (10) von Sieb (4) und Filz (5) im Abstand von der Formierwalze (3) angeordnet ist.Device for detaching a paper web from a wire, the fibrous suspension being introduced through a headbox between a wire and a felt, wire and felt being passed together over a forming roller and separated from one another after the web formation, characterized in that the separation point (10) from Sieve (4) and felt (5) is arranged at a distance from the forming roller (3). Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Trennstelle (10) als Saugwalze (15) mit Vakuumkammer (16) ausgeführt ist.Device according to claim 1, characterized in that the separation point (10) is designed as a suction roll (15) with a vacuum chamber (16). Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Trennstelle (10) als Saugschuh (11) ausgeführt ist.Device according to claim 1, characterized in that the separation point (10) is designed as a suction shoe (11). Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass der Saugschuh (11) einen, vorteilhaft mehrere, insbesondere zwei Saugschlitze (14) aufweist.Apparatus according to claim 3, characterized in that the suction shoe (11) has one, advantageously several, in particular two suction slots (14). Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass bei der Trennstelle (10) von Sieb (4) und Filz (5) zumindest eine, insbesondere verfahrbare, Bahnschneideinrichtung (12), insbesondere Randspritzdüse(n) oder Gautschknechtdüse(n), vorgesehen ist (sind).Device according to one of claims 1 to 4, characterized in that at the separation point (10) of the screen (4) and felt (5) at least one, in particular movable, web cutting device (12), in particular edge spray nozzle (s) or rubber rubber nozzle (s) , is (are) provided. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass zwischen der Formierwalze (3) und der Trennstelle (10) von Sieb (4) und Filz (5) an der Bahn zumindest eine, insbesondere verfahrbare, Bahnschneideinrichtung (12), insbesondere Randspritzdüse(n) oder Gautschknechtdüse(n), vorgesehen ist (sind).Device according to one of claims 1 to 4, characterized in that between the forming roller (3) and the separation point (10) of the screen (4) and felt (5) on the web at least one, in particular movable, web cutting device (12), in particular Edge spray nozzle (s) or rubber rubber nozzle (s), is (are) provided. Vorrichtung nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass eine Einrichtung zur Abtrennung des Aufführstreifens vorgesehen ist, die eine oder mehrere Spritzdüsen aufweist.Apparatus according to claim 5 or 6, characterized in that a device for separating the lead strip is provided which has one or more spray nozzles.
EP20030025273 2002-11-11 2003-11-06 Apparatus for detaching a paper web from a wire Expired - Lifetime EP1418271B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200330718T SI1418271T1 (en) 2002-11-11 2003-11-06 Apparatus for detaching a paper web from a wire

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0169202A AT412098B (en) 2002-11-11 2002-11-11 DEVICE FOR SEPARATING A PAPER RAIL FROM A SCREEN
AT16922002 2002-11-11

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EP1418271A1 true EP1418271A1 (en) 2004-05-12
EP1418271B1 EP1418271B1 (en) 2007-01-03

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US (1) US7005037B2 (en)
EP (1) EP1418271B1 (en)
AT (2) AT412098B (en)
BR (1) BR0305190A (en)
CA (1) CA2448105A1 (en)
DE (1) DE50306172D1 (en)
ES (1) ES2279919T3 (en)
PT (1) PT1418271E (en)
SI (1) SI1418271T1 (en)

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US8968519B2 (en) 2013-03-14 2015-03-03 Georgia-Pacific Consumer Products Lp Sheet edge trimming and removal from a structured paper fabric

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US5908534A (en) * 1992-08-04 1999-06-01 Valmet-Karlstad Ab Method and device for web cutting in the former of a paper machine
DE19803451A1 (en) * 1998-01-30 1999-08-05 Voith Sulzer Papiertech Patent Fourdrinier section of a paper and cardboard production machine
US6361654B1 (en) * 2000-04-26 2002-03-26 Kimberly-Clark Worldwide, Inc. Air knife assisted sheet transfer
EP1245727A1 (en) * 2001-03-26 2002-10-02 A. CELLI S.p.A Machine and method for producing a sheet of paper material

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US7005037B2 (en) 2006-02-28
CA2448105A1 (en) 2004-05-11
ATE350533T1 (en) 2007-01-15
BR0305190A (en) 2004-08-31
AT412098B (en) 2004-09-27
SI1418271T1 (en) 2007-06-30
ES2279919T3 (en) 2007-09-01
DE50306172D1 (en) 2007-02-15
PT1418271E (en) 2007-03-30
ATA16922002A (en) 2004-02-15
EP1418271B1 (en) 2007-01-03
US20040129399A1 (en) 2004-07-08

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