EP1418271B1 - 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
EP1418271B1
EP1418271B1 EP20030025273 EP03025273A EP1418271B1 EP 1418271 B1 EP1418271 B1 EP 1418271B1 EP 20030025273 EP20030025273 EP 20030025273 EP 03025273 A EP03025273 A EP 03025273A EP 1418271 B1 EP1418271 B1 EP 1418271B1
Authority
EP
European Patent Office
Prior art keywords
wire
paper web
felt
der
separation point
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.)
Expired - Lifetime
Application number
EP20030025273
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German (de)
French (fr)
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EP1418271A1 (en
Inventor
Harald Weigant
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Andritz AG
Original Assignee
Andritz AG
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Filing date
Publication date
Application filed by Andritz AG filed Critical Andritz AG
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 wet end of a paper machine for producing a paper web, wherein the pulp suspension is introduced through a headbox between a wire and a felt, wherein the wire and the felt are passed together over a forming roller, wherein after the formation of the web from the web and the felt is separated.
  • web cutting devices are provided in front of the separation point between the wire and the felt.
  • the disadvantage of the arrangement is that, in particular at high machine speeds or large web widths, the felt sags after the separation and thus leads to damage to the paper web. Also, the paper web is not always completely detached from the wire. This leads on the one hand to contamination of the screen and on the other hand to repeated breaks of the paper web.
  • US Pat. No. 6,361,654 discloses a wet end of the type mentioned at the outset in which the wire is separated from the paper web and the felt by a device for detaching the paper web from the wire.
  • the separation point is arranged at a distance from the forming roller.
  • the device for detaching the paper web from the screen has a suction shoe provided with a suction slit and a blowing slotted blower shoe, wherein the blow slit is arranged opposite the suction slit.
  • the invention now aims to improve the systems of the prior art and achieve an exact separation of the paper web from the screen even at relatively low felt tension and large machine widths and / or high machine speeds, the quality of the paper web should remain high.
  • the separation point of the wire and felt is arranged at a distance from the forming roller.
  • the separation point is designed as a suction shoe, wherein the suction shoe has one, advantageously several, in particular two, suction slots and additionally at least one, in particular movable, web cutting device, in particular edge spray nozzle or Gautschknechtdüse provided at the separation point of the screen and felt.
  • edge spray nozzle or Gautschknechtdüse provided at the separation point of the screen and felt.

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 Nasspartie einer Papiermaschine zur Erzeugung einer Papierbahn, wobei die Faserstoffsuspension durch einen Stoffauflauf zwischen ein Sieb und einen Filz eingebracht wird, wobei das Sieb und der Filz gemeinsam über eine Formierwalze geführt werden, wobei nach der Bahnbildung das Sieb von der Papierbahn und dem Filz getrennt wird.The invention relates to a wet end of a paper machine for producing a paper web, wherein the pulp suspension is introduced through a headbox between a wire and a felt, wherein the wire and the felt are passed together over a forming roller, wherein after the formation of the web from the web and the felt is separated.

Eine derartige Nasspartie 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.Such a wet end is e.g. described in US 5,908,534. When leaving the roll, the wire and felt are disassembled leaving the web on the felt and continuing to the dryer.

Im Bereich der Formierwalze sind vor der Trennstelle zwischen Sieb und Filz Bahnschneideinrichtungen vorgesehen.In the area of the forming roller, web cutting devices are provided in front of the separation point between the wire and the felt.

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.The disadvantage of the arrangement is that, in particular at high machine speeds or large web widths, the felt sags after the separation and thus leads to damage to the paper web. Also, the paper web is not always completely detached from the wire. This leads on the one hand to contamination of the screen and on the other hand to repeated breaks of the paper web.

Die US 6,361,654 offenbart eine Nasspartie der eingangs genannten Art, bei der das Sieb durch eine Vorrichtung zum Ablösen der Papierbahn vom Sieb von der Papierbahn und dem Filz getrennt wird. Die Trennstelle ist im Abstand von der Formierwalze angeordnet. Die Vorrichtung zum Ablösen der Papierbahn vom Sieb weist einen mit einem Saugschlitz versehenen Saugschuh und einen mit einem Blasschlitz versehenen Blasschuh auf, wobei der Blasschlitz dem Saugschlitz gegenüberliegend angeordnet ist.US Pat. No. 6,361,654 discloses a wet end of the type mentioned at the outset in which the wire is separated from the paper web and the felt by a device for detaching the paper web from the wire. The separation point is arranged at a distance from the forming roller. The device for detaching the paper web from the screen has a suction shoe provided with a suction slit and a blowing slotted blower shoe, wherein the blow slit is arranged opposite the suction slit.

Die Erfindung will nun die Anlagen nach dem Stand der Technik verbessern und eine exakte Trennung der Papierbahn vom Sieb auch bei relativ geringer Filzspannung und großen Maschinenbreiten und/oder hohen Maschinengeschwindigkeiten erreichen, wobei die Qualität der Papierbahn hoch bleiben soll.The invention now aims to improve the systems of the prior art and achieve an exact separation of the paper web from the screen even at relatively low felt tension and large machine widths and / or high machine speeds, the quality of the paper web should remain high.

Dies wird erfindungsgemäß durch eine Nasspartie gemäß dem Anspruch 1 erreicht. Bei der erfindungsgemäßen Nasspartie ist die Trennstelle von Sieb und Filz im Abstand von der Formierwalze angeordnet. Die Trennstelle ist als Saugschuh ausgeführt, wobei der Saugschuh einen, vorteilhaft mehrere, insbesondere zwei, Saugschlitze aufweist und zusätzlich ist bei der Trennstelle von Sieb und Filz zumindest eine, insbesondere verfahrbare, Bahnschneideinrichtung, insbesondere Randspritzdüse oder Gautschknechtdüse, vorgesehen. Dadurch kann immer eine optimale Filzspannung bei gleichzeitig exakter Trennung von Papierbahn und Sieb und gleichzeitig ein exakter Schnitt ohne Beeinflussung der Formation der Bahn erzielt werden. Die Bahnschneideinrichtung kann dabei in Maschinenlängs- und/oder -querrichtung verfahrbar ausgeführt sein.This is inventively achieved by a wet end according to the claim 1. In the wet end according to the invention, the separation point of the wire and felt is arranged at a distance from the forming roller. The separation point is designed as a suction shoe, wherein the suction shoe has one, advantageously several, in particular two, suction slots and additionally at least one, in particular movable, web cutting device, in particular edge spray nozzle or Gautschknechtdüse provided at the separation point of the screen and felt. As a result, it is always possible to achieve an optimum felt tension with at the same time exact separation of paper web and wire and at the same time an exact cut without influencing the formation of the web. The web cutting device can be designed to be movable in machine longitudinal and / or transverse directions.

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, Fig. 3 einen Ausschnitt aus Fig. 2, und Fig. 4 eine Detail aus Fig. 3 darstellt.

  • 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.
  • 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.
  • 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 einem quer zur Bahnlaufrichtung verlaufenden Schlitz 14 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. 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. 4 zeigt nochmals die Trennstelle 10 im Detail. Hier ist besonders gut der Schlitz 14 im Saugschuh 11 erkennbar.
The invention will now be described by way of example with reference to the drawings, in which Fig. 1 shows a plant according to the prior art, Fig. 2 shows a plant with the device according to the invention, Fig. 3 shows a detail from Fig. 2, and Fig. 4 shows a detail from Fig 3 represents.
  • Fig. 1 shows a section of the wet part of a paper machine, for example for the production of tissue paper. The wet end consists of a twin-wire former 1 and a headbox 2. The twin-wire former 1 is shown as a crescent former with a forming roll 3, a wire 4 and a felt 5. Sieve 4 and felt 5 run together over the forming roller 3. Sieve 4 is passed over a breast roll 6 and after separation via a guide roller 7, which is arranged at a short distance from the forming roller 3. The felt 5 is passed through a roller 8 after separation from the wire 4 together with the paper web 9 formed. In such systems, there is a risk that it comes at low felt tension or at high speeds or large machine widths again and again to the sagging of the felt 5 and uneven contact with the wire 4, resulting in damage to the paper web or even paper web breaks.
  • In Fig. 2, a system with the device according to the invention is shown, wherein analogous parts are denoted by the same reference numerals as in Fig. 1. In contrast to the prior art here the sieve 4, the felt 5 and the intermediate web 9 are still removed together from the forming roller and run a distance together. Only at the separation point 10, the separation takes place. As a result, the circumference of the forming roller can be used longer or at higher machine speeds same forming times can be achieved, thereby also at the higher machine speeds the quality of the paper web is maintained. At the separation point 10, a suction shoe 11 is provided here. Furthermore, spray pipes 12 for high-pressure water for cutting the edge strips and the Aufführstreifens can be seen.
  • Fig. 3 shows the section in the circle III in Fig. 2. Here, the separation point 10 is clearly visible. The wire 4 continues to run over a deflection roller 7, while felt 5 and paper web 9 are continued over a deflection roller 8. The suction shoe 11 is connected to a suction tube 13 and equipped with a transverse to the running direction slot 14. If the edge strip or the Aufführstreifen be 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 can be selectively discharged. Of course, two suction slits 14 arranged one behind the other can of course also be provided, whereby a splitting of the spray water and the suction of the paper web onto the felt can be achieved particularly well.
  • Fig. 4 shows again the separation point 10 in detail. Here, the slot 14 in the suction shoe 11 is particularly well recognizable.

Claims (1)

  1. Wet section of a paper machine for producing a paper web (9), wherein the pulp suspension is fed in between a wire (4) and a felt (5) via a headbox (2), wherein the wire (4) and the felt (5) are guided together over a forming roll (3), the wire (4) is separated from the paper web (9) and the felt (5) by a device for detaching the paper web (9) from the wire (4) after the paper web (9) has formed, the separation point (10) of the wire (4) and the paper web (9) being arranged at a distance from the forming roll (3) and the separation point (10) being designed as a suction shoe (11) having at least one suction slot (14), advantageously several, particularly two suction slots arranged one after the other, and at least one, particularly movable cutting device (12), in particular an edge trim nozzle or tail cutter nozzle, being provided at the separation point (10) of the wire (4) and the felt (5).
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

Publications (2)

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

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Family Applications (1)

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EP20030025273 Expired - Lifetime EP1418271B1 (en) 2002-11-11 2003-11-06 Apparatus for detaching a paper web from a wire

Country Status (9)

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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)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT412098B (en) * 2002-11-11 2004-09-27 Andritz Ag Maschf DEVICE FOR SEPARATING A PAPER RAIL FROM A SCREEN
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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AT412098B (en) * 2002-11-11 2004-09-27 Andritz Ag Maschf DEVICE FOR SEPARATING A PAPER RAIL FROM A SCREEN

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Publication number Publication date
US7005037B2 (en) 2006-02-28
CA2448105A1 (en) 2004-05-11
ATE350533T1 (en) 2007-01-15
EP1418271A1 (en) 2004-05-12
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
US20040129399A1 (en) 2004-07-08

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