EP1136619B1 - Dispositif de pressage - Google Patents

Dispositif de pressage Download PDF

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Publication number
EP1136619B1
EP1136619B1 EP01101207A EP01101207A EP1136619B1 EP 1136619 B1 EP1136619 B1 EP 1136619B1 EP 01101207 A EP01101207 A EP 01101207A EP 01101207 A EP01101207 A EP 01101207A EP 1136619 B1 EP1136619 B1 EP 1136619B1
Authority
EP
European Patent Office
Prior art keywords
belt
fibrous web
press
roll
dewatering
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
EP01101207A
Other languages
German (de)
English (en)
Other versions
EP1136619A2 (fr
EP1136619A3 (fr
Inventor
Gerhard Kotitschke
Wolfgang Mayer
Roland Mayer
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.)
Voith Patent GmbH
Original Assignee
Voith Paper Patent GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE2000112148 external-priority patent/DE10012148A1/de
Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1136619A2 publication Critical patent/EP1136619A2/fr
Publication of EP1136619A3 publication Critical patent/EP1136619A3/fr
Application granted granted Critical
Publication of EP1136619B1 publication Critical patent/EP1136619B1/fr
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
    • 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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses

Definitions

  • the invention relates to a press arrangement with at least one press nip formed by two press rolls for dewatering a paper, board, tissue or other fibrous web through which a dewatering belt for receiving the squeezed water is guided on both sides in addition to the fibrous web, wherein the fibrous web after the Pressing gap is guided in a common guide path of the two dewatering belts, the below the fibrous web extending lower dewatering belt wraps together with the fibrous web at the end of the guide an evacuated separation roller, the above the fibrous web arranged upper dewatering in the separation roller in an isolation distance from the fibrous web led away and the fibrous web is subsequently taken over by a removal belt according to the preamble of claim 1.
  • Such a pressing arrangement is known for example from DE-U-29800330.
  • the object of the invention is therefore, the leadership of the fibrous web, in particular after the separation distance d. H. to improve the routing of the upper drainage band.
  • the object has been solved by the features of claim 1.
  • the relatively large wrap angle leads to a rapidly widening gusset between fibrous web and upper dewatering belt, which allows the influx of air without the risk of web flutter.
  • the wrap angle is at least 45 °, preferably even at least 60 °.
  • the residence time of the fibrous web in the separation section should be greater than 1 ms, preferably greater than 15 ms. This then allows the routing of the upper dewatering belt without the risk of plucking with respect to the fibrous web.
  • the upper dewatering belt should be performed after the separation distance to a, this dewatering belt deflecting guide roll, and it is advantageous if the unsupported course of the dewatering belt between separation roller and guide roller as short as possible and between 20 and 200 mm, preferably between 20 and 80 mm long. As a result, there is a reduction in the flow of air in the gusset which impedes the guidance of the fibrous web at the lower drainage band.
  • the location of the guide roll of the upper drainage tape should changeable and about a wrap angle of the upper dewatering belt with respect to the separation roller of the lower dewatering belt between 0 and 5 ° be adjustable.
  • the angle between the common guide path (sandwich guide) adjoining the press nip and the press plane formed by the press rolls should preferably be variable in the range of ⁇ 5 °. If the sandwich guide increases, this is associated with a more intensive drainage downwards and thus a greater compression of the underside of the fibrous web. A sloping sandwich guide, however, leads to a more intensive drainage upwards and thus to a greater compression of the top. This offers an effective means of influencing the two-sidedness of the fibrous web, in particular with regard to surface strength, oil absorption and printability.
  • the aim of the invention is to avoid long, straight sandwich guides of dewatering belt and fibrous web.
  • the lower band can also be designed as a plastic band with largely closed, dense surface. In this case, instead of the vacuumed Trenwalze a normal guide roller is used. A relatively smooth surface ensures the adhesion of the fibrous web at the lower band.
  • the fibrous web runs together with the lower dewatering belt from the separation roller to a spaced, looped by the air-permeable collection tape and suction removal roll, where the fibrous web is taken over by the removal belt.
  • the clear distance between the separation roller and the take-off roll should be as small as possible and is between 20 and 200 mm, in particular between 20 and 80 mm. Because of the short distance between separation and take-off roll can in this area on web stabilizers and additional blowing or suction be waived. In addition, this also leads to the shortening of the gusset and thus to reduce the attack surface of the fibrous web.
  • the lower dewatering belt wraps around an adjustable guide roller after the transfer of the fibrous web and a gap, a contact or a wrap of the lower dewatering belt with respect to the take-off roller is adjustable via this guide roller. This allows, for example, for safely transferring the fibrous web to form a relatively large wrap angle.
  • the accepting band has a higher speed than the lower dewatering band.
  • the removal belt may be formed as a press felt of a following press nip, as a transfer belt for onward transport or as a dryer wire of a following drying group for drying the fibrous web.
  • the distance between the guide roller of the upper dewatering belt and the take-off belt should be adjustable in order thus to control the entrained air in the gusset.
  • both dewatering belts should be formed as a press felt.
  • Particularly suitable is the press arrangement at web speeds of the fibrous web of more than 1500 m / min.
  • FIG. 1 shows a schematic cross section through a press arrangement according to the invention for dewatering a fibrous web 1, in particular a paper web.
  • a dewatering belt 2, 3 in the form of an air-permeable press felt for receiving and for transporting the squeezed out water is guided on both sides next to the fibrous web 1.
  • the upper press roll 11 has a flexible roll shell which runs over a pressure shoe with concave contact surface.
  • this guide section 4 should be as short as possible.
  • the lower dewatering belt 3 which extends below the fibrous web 1, wraps around together with the fibrous web 1 an evacuated separating roller 5 with a wrap angle 8 of approximately 60 °.
  • the outgoing from the negative pressure of the separation roller 5 increased adhesion of the fibrous web 1 allows the solution and subsequent removal of the upper drainage belt 2 of the fibrous web 1 in a separation section 6.
  • This separation section 6 forms the end of the common guide section 4, wherein the residence time of the fibrous web 1 in the Isolation distance 6 is between 1 and 5 ms.
  • the upper dewatering belt 2 is guided after the separating line 6 to a guide roller 9, the position of which can be changed in the vertical direction, so that a slight looping of the upper dewatering belt 2 of 0-5 ° can be set on the separating roller 5.
  • the free, unsupported course of the dewatering belt 2 between separation 5 and guide roller 9 is smaller than 80 mm. The shortening of the gusset limits the, affecting the leadership of the fibrous web 1 affecting air flow in the gusset.
  • the fibrous web 1 runs together with the lower dewatering belt 3 to a, from an air-permeable removal belt 7 looped and evacuated pickup roller 10.
  • the negative pressure of the pickup roller 10 supports the transfer of the fibrous web 1 from the lower dewatering belt 3 to the removal belt 7. Zur Limiting the vulnerable area in which the fibrous web 1 runs together with the lower dewatering belt 3 between separation and take-off roll 10 without web stabilizers, suction or blowing devices, the clear, that is the shortest distance between separation 5 and take-off roll 10 is less than 80 mm.
  • the removal belt 7 runs slightly faster than the lower dewatering belt 3. This train is so small that no negative effects on the web guide are to be expected. It depends on the moisture elongation of the fibrous web 1, the machine speed and the elongation in the dryer section. It should be approx. 0.5 - 1.0% between two presses and approx. 2.5 - 4.0% between the last press and the dryer section.
  • the lower dewatering belt 3 is guided over the transfer of the fibrous web 1 via an adjustable guide roller 13. By their adjustment, a wrap of the take-off roll 10 can be achieved, which can be of advantage when transferring the fibrous web 1. After the transfer can then again a contact or a gap between the lower Dewatering belt 3 and the take-off roller 10 are set with the removal belt 7.
  • the height-adjustable guide roller 9 of the upper dewatering belt 2 makes it possible to influence the gap between this guide roller 9 and the removal belt 7 and thus the entrained air in the gusset.
  • the removal belt 7 may be formed as a press felt of a subsequent press nip or as a dryer wire of a following drying group.
  • the evacuated rolls have a perforated roll shell, the interior of which is connected to a vacuum source.
  • the evacuated region of the guide rolls in its extension transversely to the fibrous web 1 can be changed and / or subdivided into separately controllable negative-pressure zones.
  • the web edges of the fibrous web 1 due to the increased risk of lifting should be assigned separate high vacuum zones.

Landscapes

  • Paper (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Press Drives And Press Lines (AREA)
  • Glass Compositions (AREA)

Claims (15)

  1. Dispositif de pressage avec au moins une fente de pressage formée par deux rouleaux de pressage (11, 12) pour l'égouttage d'une nappe de papier, de carton, de papier-tissu ou d'une autre nappe fibreuse (1), à travers laquelle, outre la nappe fibreuse (1), une bande d'égouttage (2, 3) est également guidée des deux côtés pour recevoir l'eau exprimée, la nappe fibreuse (1) étant guidée après la fente de pressage dans une section de guidage commune (4) par les deux bandes d'égouttage (2, 3), la bande d'égouttage inférieure (3) s'étendant sous la nappe fibreuse (1) entourant conjointement avec la nappe fibreuse (1) à l'extrémité de la section de guidage (4) un rouleau de séparation aspiré (5), la bande d'égouttage supérieure (2) disposée au-dessus de la nappe fibreuse (1) étant guidée à l'écart de la nappe fibreuse (1) dans la région du rouleau de séparation (5) dans une section de séparation (6), la nappe fibreuse (1) étant reprise ensuite par une bande de réception (7) qui entoure un rouleau de reprise (10), l'enveloppement du rouleau de séparation (5) suivant la section de séparation (6) par la bande d'égouttage inférieure (3) ainsi que la nappe fibreuse (1) s'effectuant suivant un angle d'enveloppement (8) d'au moins 30°, caractérisé en ce que
    la distance intérieure entre le rouleau de séparation (5) et le rouleau de reprise (10) est comprise entre 20 et 200 mm et la bande de reprise (7) possède une vitesse supérieure à la bande d'égouttage inférieure (3).
  2. Dispositif de pressage selon la revendication 1, caractérisé en ce que l'angle d'enveloppement (8) vaut au moins 45°, de préférence 60°.
  3. Dispositif de pressage selon la revendication 1 ou 2, caractérisé en ce que le temps de séjour de la nappe fibreuse (1) dans la section de séparation (6) est supérieur à 1 ms, de préférence supérieur à 15 ms.
  4. Dispositif de pressage selon l'une quelconque des revendications précédentes, caractérisé en ce que la bande d'égouttage supérieure (2) est guidée après la section de séparation (6) jusqu'à un rouleau conducteur (9) déviant la bande d'égouttage (2), la distance non supportée de la bande d'égouttage (2) entre le rouleau de séparation (5) et le rouleau conducteur (9) étant comprise entre 20 et 200 mm, de préférence entre 20 et 80 mm de long.
  5. Dispositif de pressage selon la revendication 4, caractérisé en ce que la position du rouleau conducteur (9) de la bande d'égouttage supérieure (2) peut être modifiée et en outre un angle d'enveloppement de la bande d'égouttage supérieure (2) peut être ajusté par le biais des rouleaux de séparation (5) entre 0 et 5°.
  6. Dispositif de pressage selon l'une quelconque des revendications précédentes, caractérisé en ce que la nappe fibreuse (1) s'étend conjointement avec la bande d'égouttage inférieure (3) depuis le rouleau de séparation (5) jusqu'au rouleau de réception (10) espacé de celui-ci, aspiré et entouré par la bande de réception (7) perméable à l'air, la nappe fibreuse (1) étant reprise par la bande de réception (7).
  7. Dispositif de pressage selon la revendication 6, caractérisé en ce que la distance intérieure entre le rouleau de séparation (5) et le rouleau de réception (10) est comprise entre 20 et 80 mm.
  8. Dispositif de pressage selon la revendication 6 ou 7, caractérisé en ce que la bande d'égouttage inférieure (3) entoure après le transfert de la nappe fibreuse (1) un rouleau conducteur réglable (13) et une fente, un contact ou un enveloppement de la bande d'égouttage inférieure (3) peut être ajusté par le biais de ce rouleau conducteur (13) par rapport au rouleau de réception (10).
  9. Dispositif de pressage selon l'une quelconque des revendications 4 à 8, caractérisé en ce que la distance entre le rouleau conducteur (9) de la bande d'égouttage supérieure (5) et la bande de réception (7) est ajustable.
  10. Dispositif de pressage selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins la bande d'égouttage inférieure, de préférence les deux bandes d'égouttage (2, 3) sont réalisées sous forme de feutres de pressage.
  11. Dispositif de pressage selon l'une quelconque des revendications précédentes, caractérisé en ce que la bande de réception (7) est réalisée sous la forme d'un feutre de pressage d'une fente de pressage suivante.
  12. Dispositif de pressage selon l'une quelconque des revendications 1 à 10, caractérisé en ce que la bande de réception (7) est réalisée sous la forme d'une bande de transfert.
  13. Dispositif de pressage selon l'une quelconque des revendications 1 à 10, caractérisé en ce que la bande de réception (7) est réalisée sous forme de toile de séchage d'un groupe de séchage suivant pour le séchage de la nappe fibreuse (1).
  14. Dispositif de pressage selon l'une quelconque des revendications précédentes, caractérisé en ce que la fente de pressage du dispositif de pressage est réalisée de manière prolongée.
  15. Dispositif de pressage selon l'une quelconque des revendications précédentes, caractérisé en ce que deux fentes de pressage sont prévues et de préférence les deux, mais au moins la dernière des fentes de pressage est réalisée sous forme prolongée.
EP01101207A 2000-03-13 2001-01-19 Dispositif de pressage Expired - Lifetime EP1136619B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10012148 2000-03-13
DE2000112148 DE10012148A1 (de) 2000-03-13 2000-03-13 Pressanordnung
DE20019256U 2000-11-13
DE20019256U DE20019256U1 (de) 2000-03-13 2000-11-13 Pressanordnung

Publications (3)

Publication Number Publication Date
EP1136619A2 EP1136619A2 (fr) 2001-09-26
EP1136619A3 EP1136619A3 (fr) 2002-08-28
EP1136619B1 true EP1136619B1 (fr) 2006-07-05

Family

ID=26004814

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01101207A Expired - Lifetime EP1136619B1 (fr) 2000-03-13 2001-01-19 Dispositif de pressage

Country Status (4)

Country Link
US (1) US6666954B2 (fr)
EP (1) EP1136619B1 (fr)
AT (1) ATE332408T1 (fr)
DE (1) DE50110372D1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1158092B1 (fr) * 2000-05-24 2006-09-06 Voith Paper Patent GmbH Section de séchage
DE10241010A1 (de) * 2002-09-05 2004-03-25 Voith Paper Patent Gmbh Transferband
FI114647B (fi) * 2003-07-02 2004-11-30 Metso Paper Inc Sovitelma rainan hallitsemiseksi paperi- tai kartonkikoneen puristinosalla
DE10333138A1 (de) * 2003-07-22 2005-02-17 Voith Paper Patent Gmbh Pressanordnung
DE102016201338A1 (de) * 2016-01-29 2017-08-03 Voith Patent Gmbh Presse

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI70950C (fi) * 1983-03-25 1986-10-27 Valmet Oy Pressparti med slutet drag i pappersmaskin
DE3425077A1 (de) * 1984-05-25 1985-11-28 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Doppelsieb-papiermaschine
DE3708191A1 (de) * 1987-03-13 1988-09-22 Voith Gmbh J M Nasspresse
DE4335024C2 (de) * 1993-10-14 1999-09-16 Voith Gmbh J M Pressenpartie einer Papiermaschine und Überführeinrichtung
FI110440B (fi) * 1996-04-04 2003-01-31 Metso Paper Inc Rainan siirto paperikoneen kaksihuopaisesta viimeisestä puristinnipistä seuraavalle kuivatusosalle
DE29701382U1 (de) * 1997-01-28 1997-03-20 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Pressenpartie einer Papiermaschine
DE19801417A1 (de) 1998-01-16 1999-07-22 Voith Sulzer Papiertech Patent Pressenpartie
DE19802054A1 (de) 1998-01-21 1999-07-22 Voith Sulzer Papiertech Patent Pressenpartie
DE29823556U1 (de) 1998-04-15 1999-09-02 Voith Sulzer Papiertechnik Patent GmbH, 89522 Heidenheim Pressenanordnung
EP0950759A3 (fr) 1998-04-15 2000-11-29 Voith Sulzer Papiertechnik Patent GmbH Dispositif de pressage
DE19848284A1 (de) * 1998-04-15 1999-10-28 Voith Sulzer Papiertech Patent Pressenanordnung

Also Published As

Publication number Publication date
ATE332408T1 (de) 2006-07-15
US20010020524A1 (en) 2001-09-13
EP1136619A2 (fr) 2001-09-26
EP1136619A3 (fr) 2002-08-28
US6666954B2 (en) 2003-12-23
DE50110372D1 (de) 2006-08-17

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