EP0608534B1 - Presse humide pour une machine à papier - Google Patents

Presse humide pour une machine à papier Download PDF

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Publication number
EP0608534B1
EP0608534B1 EP93120064A EP93120064A EP0608534B1 EP 0608534 B1 EP0608534 B1 EP 0608534B1 EP 93120064 A EP93120064 A EP 93120064A EP 93120064 A EP93120064 A EP 93120064A EP 0608534 B1 EP0608534 B1 EP 0608534B1
Authority
EP
European Patent Office
Prior art keywords
press
roller
gap
wet
roll
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
EP93120064A
Other languages
German (de)
English (en)
Other versions
EP0608534A1 (fr
Inventor
Gerhard Kotitschke
Christian Schiel
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.)
JM Voith GmbH
Original Assignee
JM Voith 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 DE4301750A external-priority patent/DE4301750C2/de
Priority claimed from DE4321405A external-priority patent/DE4321405A1/de
Application filed by JM Voith GmbH filed Critical JM Voith GmbH
Publication of EP0608534A1 publication Critical patent/EP0608534A1/fr
Application granted granted Critical
Publication of EP0608534B1 publication Critical patent/EP0608534B1/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
    • D21F3/04—Arrangements thereof

Definitions

  • the invention relates to a wet press for a paper machine. Reference is made to the preamble of claim 1.
  • a press of this type has become known from US-A-4,556,451.
  • This press comprises four press rolls which form an uninterrupted chain with one another, so that the paper web always wraps around a press roll on a part of its circumference as it passes through the press, and that a total of three press nips are formed.
  • the four-roll press mentioned is preceded by a two-roll press which takes over the paper web coming from the wire of the paper machine.
  • US-A-2 694 348 describes a press section in which the paper web is first removed from the paper machine screen by means of a felt belt and is passed with this felt belt through a first two-roll press.
  • a second felt which also runs through the aforementioned two-roll press, takes over the paper web and guides it through a second two-roll press.
  • the paper web is then removed from a third felt belt which passes through the second two-roll press; this third felt belt guides the paper web through a third two-roll press two-roll press. through, and further through a fourth
  • This press section thus has a total of four press nips.
  • Felt tapes are thus simultaneously passed through all press nips with the paper web. Between the individual press nips, the paper web is transported by the felts mentioned, namely on a route on which the felt web bridges a free path with the paper web located thereon or attached to it.
  • wet presses should generally have a high pressing efficiency, take up as little space as possible, especially when viewed in the running direction of the paper web and in the horizontal direction, and they should also have an inexpensive construction.
  • the invention is therefore based on the object of designing a wet press in accordance with the preamble of claim 1 in such a way that with high pressing efficiency and high Speeds a correct transfer of the narrow transfer strip or the completely wide paper web is ensured that the marking of sieves or borehole patterns of suction rolls in the damp paper web is reduced or is avoided, and that the felt wear is reduced.
  • FIG. 1 A belt-shaped screen 1, which rotates in the direction of the arrow, wraps around a suction roller 2 and a deflection roller 3.
  • the screen 1 carries a paper web 4, which is shown in broken lines.
  • a first felt 5 can also be seen, which is also designed as an endless loop.
  • the felt 5 wraps around a number of guide rollers, of which the guide roller 6, the suction guide roller 7 and the guide roller 8 are shown, and also a press roller 9, which is part of the press.
  • Press roll 9 forms with a further press roll 10 a first press point I.
  • Press roll 9 is a shoe press roll with a pressure shoe 9. 1 shown only schematically, with which a relatively long press nip is produced, as seen in the direction of wire travel.
  • the contact shoe 9.1 is, in a known manner, displaceable in the radial direction relative to a stationary support body, not shown, so that the pressing force acting in the pressing point I can be varied.
  • Through the press point I runs a tubular and flexible press jacket sliding over the pressure shoe; its outer surface can have fine recesses (eg blind holes) for temporarily storing water (the recesses are symbolically represented by a dashed line).
  • Press roll 10 is followed by a third press roll 11.
  • Press roll 11 is adjustably mounted in the sense of double arrow 11 'for the purpose of varying the press force in press nip II.
  • Press roller 11 is followed by a fourth press roller 12, which is also a shoe press roller with a pressure shoe 12.1.
  • the rollers 11 and 12 together form a third press nip III.
  • Press roll 12 is located within the endless loop of a second press felt 14, which in turn is looped around guide rolls 15, 16, 17, etc.
  • the flexible press jacket of the press roll 12 can also have fine recesses on its outside, especially if a relatively thin and finely woven press felt 14 is used, the water absorption capacity of which is relatively low.
  • Press roll 13 is located within the endless loop of a third press felt 18. This is guided around guide rolls, as around guide rolls 19, 20.
  • a dryer section is connected to the wet press in the usual way.
  • it is a single-tier dryer section.
  • This includes a variety drying cylinders 21, 22, a plurality of deflection suction rolls 23, etc., each arranged between two drying cylinders, and a drying wire 24 with guide rolls 25, 26, etc.
  • a deflection suction roll 27 At the beginning of the drying section there is a deflection suction roll 27. This serves to remove the paper web 4 from the third press felt 18 to take off.
  • scraper 10.1 which is assigned to the press roll 10
  • scraper 11.1 which is assigned to the press roll 11
  • reject discharge channel 10.2 which is located below the press roll 10.
  • the course of the paper web 4 is as follows: The paper web 4 is first removed from the wire 1 by means of the first press felt 5 and the pick-up roller 7. It then hangs at the bottom of the first press felt 5. Together with this, it passes through the first press nip I, then leaves the press felt 5, remains on the circumference of the press roll 10 until it reaches the second press nip II, then remains on the circumference of the press roll 11 until it is reached of the third press nip III and - if appropriate - the fourth press nip IV, and is then transferred by means of the deflection suction roll 13 to the third press felt 18, from which it is removed by the deflection suction roll 27 and passed through the dryer section with the dryer wire 24.
  • press roll 10 has a relatively soft jacket, while the press roll 11 has a relatively hard coat.
  • Press felt 18 is expediently formed from a relatively fine fabric, so that the paper web 4 at the last press nip IV (if there is one) receives relatively little marking by the press felt 18. In other words: the underside of the paper web 4 remains relatively smooth on contact with the press felt 18.
  • FIG. 2 The configuration shown in FIG. 2 is similar to that of FIG. 1.
  • a part of the wire section with the wire 1, the wire suction roll 2, the deflecting roller 3, and the paper web 4 carried along on the wire 1 can again be seen.
  • a first press felt 5 is provided, which presses the paper web 4 through a first Press nip I passes between the rollers 9 and 10.
  • Roll 9 is a press roll with a smooth, i.e. closed outer surface. Deviating from this, the outer surface of the roller 9 (for temporarily storing water) can also be provided with fine recesses, e.g. Circumferential grooves.
  • the rest of the structure of the press is also very similar to that shown in FIG. 1.
  • the fifth press roll 13 is a roll with a closed outer surface.
  • the paper web 4 is delivered from the press roll 13 to the drying wire 24, the deflection suction roll 27 ensuring a reliable transfer.
  • FIG. 3 The configuration shown in Figure 3 is designed up to the pick-up roller 7 analogous to the two previous configurations. This is followed by an upstream press with a press nip Ia, formed from two press rolls 30 and 31.
  • Press roll 30 has a suction zone 30a in order to securely feed paper web 4 to press nip Ia to lead.
  • Press roller 31 has a suction zone 31.1 in order to safely transfer the paper web 4 onto a second press felt 11 '.
  • the subsequent press again comprises five press rolls, namely rolls 9, 10, 11, 12 and 13.
  • the roll 9 (with a smooth or grooved surface) is also located in the loop of the felt 11 '. Together with roller 10, it forms a press nip I.
  • the rollers 10 and 11 together form a press nip II; the rollers 11 and 12 together form a press nip III; the rollers 11 and 13 together form a fourth press nip IV.
  • the roller 12 is located within the loop of a third press felt 17.
  • the roller 13 is at the same time a suction deflecting roller and is used to transfer the paper web 4 onto a dryer fabric 18 of the downstream dryer section.
  • the dryer section and its elements do not need to be described here, since they basically have the same structure as the dryer sections of the other two configurations.
  • the paper web 4 always follows the circumferences of the press rolls involved from the first press nip I to the last press nip IV. It never runs free.
  • the second press nip II of this press is formed from a roller with a relatively soft shell - here roller 10 - and from a roller with a hard shell - here roller 11.
  • the roller 10 with a soft jacket is again arranged in front of the roller 11 with a hard jacket, as seen in the direction of travel of the paper web 4.
  • Roller 12 (with a press jacket which is smooth on the outside or provided with recesses) is in turn a shoe press roller with a shoe 12.1.
  • the configuration shown in Figure 4 is the Similar to the first two configurations according to FIGS. 1 and 2, as here too the five-roll press shown is the only press and no two-roll press is connected upstream. However, it goes without saying that this could also be different. Another press could be connected upstream and another press could also be connected downstream.
  • the first press roller 10 in contact with paper is now, in contrast to FIGS. 1 and 2, a shoe press roller, the tubular and flexible circumferential press jacket of which must therefore always be smooth.
  • the roller 10 has a radially movable (and having a concave pressing surface) press shoe 10a, which forms the press nip I together with the preferably grooved press roll 9.
  • the shoe press roll 10 has a radially movable bar 10b at the press nip II, preferably with a convex press surface.
  • This bar 10b is used to open or close the press nip II and to vary the pressing force in the press nip II. Thanks to the movable bar 10b, the press roll 11 need not be adjustable, in contrast to the exemplary embodiments according to FIGS. 1 to 3. In other words: The four press rolls 9 to 12 can all be supported essentially rigidly on a foundation or on a machine frame. This results in an extremely simple and space-saving arrangement of the entire wet press.
  • the paper web 4 is removed from the screen 1 by means of the press felt 5 and the pick-up roller 7 and passed through the first press nip I with the felt 5.
  • the paper web 4 runs through the second press nip II alone, ie without felt.
  • press nip III it is again like with press nip I; here too, paper web 4 and a felt 14 run through it together Press nip.
  • press nip IV it is again like with press nip II: the paper web 4 runs alone through this press nip.
  • This alternating path - first with felt, then without felt, then again with felt, and finally without felt - is very advantageous. Pressing out with felt allows a relatively intensive dewatering, but has the disadvantage of marking the felt fabric in the moist paper web, while the downstream press nip without felt ensures a smoothing of this previous felt marking.
  • a spray tube 13.1 is assigned to the press roller 13. It applies a water spray over the entire width of the roller to the outer surface of the roller 13 just before the press nip IV. This can, if necessary, ensure that the paper web continues to run behind the press nip IV with the roller 13.
  • a scraper 13.2 cleans the outer surface of the roller 13.

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  • Paper (AREA)

Claims (7)

  1. Presse humide pour machine à papier, permettant d'exprimer l'eau d'une bande de papier humide, dans laquelle :
    1.1 il est prévu plusieurs rouleaux compresseurs,
    1.2 les rouleaux compresseurs forment entre eux et deux à deux un intervalle de compression,
    1.3 sur son trajet du premier au dernier intervalle de compression, la bande de papier est constamment soutenue par une surface périphérique d'un rouleau compresseur,
    1.4 il est prévu au moins quatre intervalles de compression (I, II, III, IV) disposés à la suite l'un de l'autre,
    1.5 les rouleaux de compression (10, 11) qui forment entre eux un deuxième intervalle de compression (II) sans feutre présentent chacun une surface périphérique qui est fermée,
       caractérisée par les particularités suivantes :
    1.6 le deuxième intervalle de compression (II) est formé d'un rouleau compresseur (10), présentant une enveloppe périphérique relativement souple, et d'un rouleau compresseur (11) présentant une enveloppe périphérique relativement dure,
    1.7 le rouleau compresseur (10) à enveloppe périphérique souple est, considéré suivant la direction de déplacement de la bande de papier (4), disposé en amont du rouleau compresseur (11) à enveloppe périphérique dure.
  2. Presse humide selon la revendication 1, caractérisée en ce que le quatrième intervalle de compression (IV) est aussi formé de deux rouleaux compresseurs (11, 13) présentant des surfaces périphériques qui sont fermées.
  3. Presse humide selon l'une des revendications 1-2, caractérisée en ce qu'au moins l'un des intervalles de compression est formé d'une presse à sabot.
  4. Presse humide selon la revendication 3, caractérisée en ce que le premier et le troisième intervallesde compression sont formés d'une presse à sabot.
  5. Presse humide selon l'une des revendications 1 - 4, caractérisée en ce qu'un tuyau de pulvérisation (13.1) est associé à au moins l'un des rouleaux (13) à surface périphérique fermée, ce tuyau de pulvérisation étant disposé en amont de l'intervalle de compression (4) formé avec ce rouleau et pulvérisant de l'humidité sur la surface périphérique du rouleau (13).
  6. Presse humide selon la revendication 1, caractérisée par les particularités suivantes :
    a) le deuxième intervalle de compression (II) sans feutre est formé d'un rouleau compresseur (10) à sabot, dont l'enveloppe périphérique de compression, qui est souple et en fait tout le tour, présente une surface extérieure lisse, et d'un rouleau compresseur (11) normal à surface périphérique lisse et fermée,
    b) le rouleau compresseur (10) à sabot comprend un sabot de compression (10a) concave, qui forme un premier intervalle de compression (1) avec un rouleau compresseur (9) à feutre, et une barre (10b) qui, avec un rouleau compresseur (11), forme le deuxième intervalle de compression (II) sans feutre avec un rouleau de compression (11) lisse.
  7. Presse humide selon l'une des revendications 1 à 6, caractérisée en ce que le feutre (5) qui passe par le premier intervalle de compression (1) passe, en amont de cet intervalle de compression (I), sur un rouleau ramasseur (7) en vue de reprendre la bande de papier (4) de sur une toile (1).
EP93120064A 1993-01-23 1993-12-13 Presse humide pour une machine à papier Expired - Lifetime EP0608534B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4301750A DE4301750C2 (de) 1993-01-23 1993-01-23 Verfahren und Vorrichtung zum Entwässern einer Bahn mittels Pressen
DE4301750 1993-01-23
DE4321405 1993-06-26
DE4321405A DE4321405A1 (de) 1993-01-23 1993-06-26 Naßpresse für eine Papiermaschine

Publications (2)

Publication Number Publication Date
EP0608534A1 EP0608534A1 (fr) 1994-08-03
EP0608534B1 true EP0608534B1 (fr) 1997-04-02

Family

ID=25922456

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93120064A Expired - Lifetime EP0608534B1 (fr) 1993-01-23 1993-12-13 Presse humide pour une machine à papier

Country Status (6)

Country Link
US (1) US5501775A (fr)
EP (1) EP0608534B1 (fr)
JP (1) JPH07109689A (fr)
AT (1) ATE151132T1 (fr)
CA (1) CA2113848C (fr)
FI (1) FI940320A (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0652992B2 (fr) * 1993-05-29 2000-11-02 J.M. Voith GmbH Presse de machine a fabriquer du papier pour papiers fins
FI109477B (fi) * 1995-02-02 2002-08-15 Metso Paper Inc Tasauspuristimella varustettu paperikoneen puristinosa
DE19522462A1 (de) * 1995-06-21 1997-01-02 Voith Sulzer Papiermasch Gmbh Vorrichtung zur Entwässerung einer Faserstoffbahn
FI111470B (fi) * 1997-04-02 2003-07-31 Metso Paper Inc Menetelmä ja laite veden poistamiseksi paperi- tai kartonkirainasta sekä rainan viemiseksi puristinosaan
US6391158B1 (en) 2000-06-30 2002-05-21 Westvaco Corporation Method for loose draw detection in a paper machine wet press
US6649262B2 (en) 2001-07-06 2003-11-18 Kimberly-Clark Worldwide, Inc. Wet roll having uniform composition distribution
US7101587B2 (en) 2001-07-06 2006-09-05 Kimberly-Clark Worldwide, Inc. Method for wetting and winding a substrate
US20030113458A1 (en) * 2001-12-18 2003-06-19 Kimberly Clark Worldwide, Inc. Method for increasing absorption rate of aqueous solution into a basesheet
US6866220B2 (en) 2001-12-21 2005-03-15 Kimberly-Clark Worldwide, Inc. Continuous motion coreless roll winder
US7166195B2 (en) * 2003-07-15 2007-01-23 Albany International Corp. Grooved and perforated layer for use in papermakers' fabric
US11136717B1 (en) * 2018-11-19 2021-10-05 Valmet Aktiebolag Drying section of a papermaking machine comprising one or more through air drying cylinders

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2694348A (en) * 1950-09-27 1954-11-16 Beloit Iron Works Vertical transfer suction press assembly
GB1291086A (en) * 1968-11-27 1972-09-27 Kleinewefers Soehne J Means for setting a roll gap
SE374150B (fr) * 1970-03-17 1975-02-24 Ahlstroem Oy
US4075056A (en) * 1974-08-15 1978-02-21 Beloit Corporation Press section structure
US4086131A (en) * 1975-05-06 1978-04-25 Beloit Corporation Method for pressing bagasse webs
US4285766A (en) * 1977-04-25 1981-08-25 Valmet Oy Press method in a paper machine
US4556451A (en) * 1980-12-18 1985-12-03 Beloit Corporation Method of and apparatus for substantially equal compacting and dewatering of both faces of freshly felted paper web
US4483745A (en) * 1982-09-29 1984-11-20 Beloit Corporation Method and apparatus of sheet transfer using a nonporous smooth surfaced belt
DE3815278A1 (de) * 1988-05-05 1989-11-16 Voith Gmbh J M Pressenpartie einer maschine zur herstellung einer faserstoffbahn, insbesondere papierbahn
DE4042480C2 (de) * 1990-08-17 2000-02-10 Voith Gmbh J M Pressenpartie einer Papiermaschine
DE9011940U1 (fr) * 1990-08-17 1991-09-12 J.M. Voith Gmbh, 7920 Heidenheim, De
DE4102356C1 (fr) * 1991-01-26 1992-01-23 J.M. Voith Gmbh, 7920 Heidenheim, De
DE9206340U1 (fr) * 1991-08-10 1992-08-13 Sulzer-Escher Wyss Gmbh, 7980 Ravensburg, De

Also Published As

Publication number Publication date
US5501775A (en) 1996-03-26
FI940320A0 (fi) 1994-01-21
JPH07109689A (ja) 1995-04-25
EP0608534A1 (fr) 1994-08-03
CA2113848A1 (fr) 1994-07-24
ATE151132T1 (de) 1997-04-15
CA2113848C (fr) 1998-10-20
FI940320A (fi) 1994-07-24

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