EP1831456B1 - Rollpresse und rollkörper für pressrolle - Google Patents

Rollpresse und rollkörper für pressrolle Download PDF

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Publication number
EP1831456B1
EP1831456B1 EP05803702A EP05803702A EP1831456B1 EP 1831456 B1 EP1831456 B1 EP 1831456B1 EP 05803702 A EP05803702 A EP 05803702A EP 05803702 A EP05803702 A EP 05803702A EP 1831456 B1 EP1831456 B1 EP 1831456B1
Authority
EP
European Patent Office
Prior art keywords
roll
press
roll body
pulp
frame
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.)
Not-in-force
Application number
EP05803702A
Other languages
English (en)
French (fr)
Other versions
EP1831456A1 (de
EP1831456A4 (de
Inventor
Jörgen Lundberg
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP1831456A1 publication Critical patent/EP1831456A1/de
Publication of EP1831456A4 publication Critical patent/EP1831456A4/de
Application granted granted Critical
Publication of EP1831456B1 publication Critical patent/EP1831456B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/20—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using rotary pressing members, other than worms or screws, e.g. rollers, rings, discs

Definitions

  • the present invention relates to a roll body for a press roll for dewatering pulp, comprising a central drum and several frame rings, to which at least one perforated roll plate is intended to be attached, the frame rings being distributed along the length of the central drum, and to a roll press comprising at least one press roll provided with said roll body.
  • a roll press is frequently present for dewatering the cellulose-based pulp.
  • the pulp is passed between two co-operating press rolls in a roll press, the press rolls having a perforated envelope surface, whereby the envelope surface is permeable to water pressed out of the pulp, and is pressed in the press nip between the press rolls, whereby water is pressed out of the pulp.
  • a roll press for dewatering pulp is disclosed in SE 505 539 , e.g., where the central axes of the press rolls are lying in substantially the same horizontal plane, and the pulp is passing the press nip between the press rolls in a vertical direction, from below upwards.
  • SE 519 753 describes a sealing of a press roll in a roll press having two co-operating press rolls for dewatering material suspensions.
  • the above mentioned roll presses have in common that their roll bodies have a conventional structure, where the roll body comprises a longitudinal central drum, which can comprise a drum or an inner drum covered with a covering plate, or the like.
  • the central drum is provided with several supporting ribs arranged longitudinally along the longitudinal axis of the central drum and evenly distributed along the circumference of the central drum. The purpose of these supporting ribs is to strengthen the structure, and also to provide channels which axially guide liquid pressed out of the pulp to the ends of the press roll.
  • the liquid which after the press nip flows back through the roll plate and dilutes the pressed pulp especially for roll presses where the pulp is passed through the press nip between two press rolls in a vertical direction from below upwards, such as in SE 505 539 , and also regarding the lower press roll for roll presses, where the pulp is passed in a substantially horizontal direction through the press nip between an upper and a lower press roll, the central axes of which are lying in different horizontal planes.
  • the result of this rewetting is that the resulting dryness of the pressed pulp from the roll press is lower, and that the pulp is contaminated by lye or liquid previously pressed out.
  • WO 95/21289 discloses a screen drum for dewatering and/or washing cellulose pulp including a central cylinder and a cylindrical screen plate arranged coaxially outside of the central cylinder. Thin plate discs or rings are provided between the central cylinder and the screen plate. The rings are provided with a number of holes.
  • US 3,460,467 discloses a wet press for dewatering fibrous pulp having a pair of opposed perforated press rolls.
  • WO00/79039 discloses a sealing arrangement for a pulp dewatering arrangement.
  • the object of the present invention is thus to provide a roll body which provides a press roll having a minimized rewetting, and which is less complicated and less expensive to manufacture compared to conventional roll bodies, especially for roll presses where the pulp is passing the press nip between two press rolls in a vertical direction from below upwards, and regarding the lower press roll of a roll press where the pulp is passing the press nip between an upper and a lower press roll in a substantial horizontal direction. Further, the purpose is to provide a roll press which achieves a minimized rewetting and which is also less complicated and less expensive to manufacture compared to conventional roll presses.
  • each frame ring is attached to the covering sheet.
  • a press roll is provided, having minimized rewetting since the construction makes it possible to omit the supporting ribs, whereby the fall downwards of expressed liquid, inside the perforated roll plates, no longer is restricted by said supporting ribs, especially for roll presses where the cellulose-based pulp is passing the press nip between two press rolls in a vertical direction, from below upwards, and regarding the lower press roll of roll presses where the pulp is passing the press nip between an upper and a lower press roll, in a substantial horizontal direction.
  • a roll press having a minimized rewetting is provided.
  • the roll body of the present invention is also less complicated in its construction, and has fewer construction articles, which results in fewer manufacturing steps, which in turn results in lower manufacturing costs of the roll body, the press roll and, consequently, also of the roll press.
  • Each through hole is adjacent to the central drum, which results in that liquid pressed out of the pulp is more easily transported in the axial direction, and thereby further reduces the rewetting.
  • the through hole of each frame ring is axially aligned with the through hole of the adjacent frame ring, whereby an axially continuous passage through the frame rings is provided, which further facilitates the transportation of liquid in the axial direction.
  • each frame ring is provided with several through holes distributed along the circumference of the frame ring.
  • the roll body of at least one of the press rolls comprises the further special features mentioned in any of the claims 2 to 5.
  • the roll press is arranged to pass the pulp between the two press rolls in a vertical direction from below upwards, where the roll body of both press rolls comprises the special features mentioned in any of the claims 1 to 5.
  • said two press rolls form a lower press roll and an upper press roll, respectively, of the roll press, where the roll body of the lower press roll comprises the special features mentioned in any of the claims 1 to 5.
  • the central axis of the upper press roll is lying in a horizontal plane above the horizontal plane in which the central axis of the lower press roll lies, whereby the pulp is fed more horizontally than vertically between the press rolls.
  • This roll press can also comprise a conveying belt for the pulp, which runs between the press rolls.
  • Fig. 1 shows in section a conventional press roll comprising a conventional roll body.
  • the roll body comprises a longitudinal central drum 1, to the ends of which attachment means 2 are attached for the pivotal mounting in a roll press.
  • Several flat bars 4 are welded to several frame rings 5 at the inside of said frame rings 5, so that the frame rings 5 are positioned in succession with a suitable distance apart and distributed along a distance corresponding to the length of the central drum 1.
  • the flat bars 4 are extending transversely to the frame rings 5 at their inside, and form, together with the frame rings 5, a kind of "cage". This "cage” is then shrunk into its position on the supporting ribs 3.
  • the distances between the frame rings 5 allow the liquid, pressed out of the pressed pulp, to pass.
  • Onto the frame rings 5, around their whole outer circumference, several perforated roll plates 6 have then been shrunk into position, and welded edge to edge.
  • Fig. 2 shows a partial sectional view of a conventional press roll, illustrating in more detail the attachment of the frame rings 2.5 to the central drum 2.1, by means of the longitudinal supporting ribs 2.3 and the flat bars 2.4.
  • Fig. 3 shows a partial sectional view of an embodiment of a roll body according to the present invention.
  • Several frame rings 7 are attached directly to the central drum 8 of the roll body, and each frame ring 7 is provided with several through holes/recesses 9.1, 9.2, 9.3 distributed over the circumference of the frame ring 7, which provide a passage in the axial direction for the transport of liquid to the ends of the roll body.
  • the extension of the frame rings 7 in the radial direction is considerably greater compared to conventional frame rings, which in the roll body according to the present invention results in an effective "height of fall" of the expressed liquid after the passage through the perforated roll plate, due to the absence of the conventional supporting ribs.
  • the recesses 91, 9.2, 9.3 are adjacent to the central drum 8, which facilitates the axial transport of liquid.
  • the recesses 9.1, 9.2, 9.3 of each frame ring 7 are in axial alignment with the corresponding recesses of the adjacent frame ring, whereby an axially continuous passage through the frame rings 7 is provided.
  • the central drum 8 is covered with a surface of stainless steel 10. The roll plates are then affixed to the outside of the frame rings 7.
  • Fig. 4 shows a schematic partial top view of the frame rings of the roll body of Fig. 3 .
  • Each frame ring 7, 7.1, 7.2, 7.3, 7.4 is attached to an adjacent frame ring 7, 7.1, 7.2, 7.3, 7.4 by means of several welded intermediate members 11.1, 11.2, 11.3, 11.4 to provide a rigid construction.
  • the frame rings can be fixed in relation to each other in any other way, by screw joint reinforcement, shrinking etc., for example.
  • Fig. 5 shows an embodiment of the roll press according to the present invention, comprising a first press roll 12 and a second press roll 13, the longitudinal central axes of which are lying in substantially the same horizontal plane, each press roll comprising a roll body according to the present invention, where respective frame ring 14, 15 is attached directly to respective central drum 16, 17.
  • Perforated roll plates 18, 19 are abutting against the frame rings 14, 15.
  • the pulp 20 is fed in through an inlet 21 and pressed up towards a press nip 22 between the first and the second press roll 12, 13, the rotation of which is indicated by vertically pointing arrows, the pulp 20 being dewatered and further pressed vertically upwards.
  • the liquid pressed out of the pulp 20 in the press nip 22, which has permeated through the holes of the roll plates 18, 19, can more easily fall downwards compared to conventional roll presses, whereby the rewetting is effectively reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Claims (8)

  1. Walzenkörper für eine Presswalze (12, 13) zur Pulpenentwässerung, umfassend eine zentrale Trommel (8, 16, 17) und mehrere Rahmenringe (7, 7.1, 7.2, 7.3, 7.4, 14, 15), auf die zumindest eine perforierte Wälzplatte (18,19) zu befestigen vorgesehen ist, wobei die Rahmenringe entlang der Länge der zentralen Trommel (8, 16, 17) verteilt sind, jeder Rahmenring (7, 7.1, 7.2, 7.3, 7.4, 14, 15) direkt an der zentralen Trommel (8, 16, 17) befestigt ist und mit zumindest einem Durchgangsloch (9.1, 9.2, 9.3) versehen ist, dadurch gekennzeichnet, dass jedes Durchgangsloch (9.1, 9.2, 9.3) an der zentralen Trommel (8, 16, 17) angrenzt, wobei ein Durchgang in axialer Richtung zum Transport von Flüssigkeit an die Enden des Walzenkörpers vorgesehen ist.
  2. Walzenkörper nach Anspruch 1, dadurch gekennzeichnet, dass das Durchgangsloch (9.1, 9.2, 9.3) eines jeden Rahmenrings (7, 7.1, 7.2, 7.3, 7.4, 14, 15) axial mit dem Durchgangsloch (9.1, 9.2, 9.3) des angrenzenden Rahmenrings (7, 7.1, 7.2, 7.3, 7.4, 14, 15) fluchtet, wobei ein axial kontinuierlicher Durchgang durch die Rahmenringe vorgesehen ist.
  3. Walzenkörper nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, dass jeder Rahmenring (7, 7.1, 7.2, 7.3, 7.4, 14, 15) mit mehreren entlang des Umfangs des Rahmenrings verteilten Durchgangslöchern (9.1, 9.2, 9.3) vorgesehen ist.
  4. Walzenkörper nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass jeder Rahmenring (7, 7.1, 7.2, 7.3, 7.4, 14, 15) mit dem angrenzenden Rahmenring (7, 7.1, 7.2, 7.3, 7.4, 14, 15) durch zumindest ein Zwischenstück (11.1, 11.2, 11.3, 11.4) verbunden ist.
  5. Walzenkörper nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die zentrale Trommel (8, 16, 17) eine Oberfläche aus rostfreiem Stahl (10) ausweist.
  6. Walzenpresse zur Pulpenentwässerung, umfassend zwei Presswalzen (12, 13), zwischen welchen die Pulpe (20) durchläuft, wobei im Walzenspalt, in dem die Pulpe gepresst wird, der Walzenkörper für jede Presswalze eine zentrale Trommel (8, 16, 17) und mehrere Rahmenringe (7, 7.1, 7.2, 7.3, 7.4, 14, 15) umfasst, die entlang der Länge der zentralen Trommel verteilt sind, wobei weiters zumindest eine perforierte Wälzplatte (18,19) auf den Rahmenringen befestigt ist, dadurch gekennzeichnet, dass der Walzenkörper für mindestens eine der Presswalzen (12, 13) die speziellen Merkmale nach einem der Ansprüche 1 bis 5 umfasst.
  7. Walzenpresse nach Anspruch 6, dadurch gekennzeichnet, dass die Walzenpresse so angeordnet ist, damit die Pulpe zwischen den beiden Presswalzen (12, 13) in vertikaler Richtung von unten nach oben gehend durchläuft, und dass der Walzenkörper beider Presswalzen die speziellen Merkmale nach einem der Ansprüche 1 bis 5 umfasst.
  8. Walzenpresse nach Anspruch 6, dadurch gekennzeichnet, dass beide besagten Presswalzen eine untere Presswalze bzw. eine obere Presswalze der Walzenpresse bilden, und dass der Walzenkörper der unteren Presswalze die speziellen Merkmale nach einem der Ansprüche 1 bis 5 umfasst.
EP05803702A 2004-12-22 2005-11-17 Rollpresse und rollkörper für pressrolle Not-in-force EP1831456B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0403129A SE528002E (sv) 2004-12-22 2004-12-22 Valspress samt valskropp för pressvals
PCT/SE2005/001732 WO2006068569A1 (en) 2004-12-22 2005-11-17 A roll press and a roll body for a press roll

Publications (3)

Publication Number Publication Date
EP1831456A1 EP1831456A1 (de) 2007-09-12
EP1831456A4 EP1831456A4 (de) 2010-04-07
EP1831456B1 true EP1831456B1 (de) 2012-05-30

Family

ID=34075258

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05803702A Not-in-force EP1831456B1 (de) 2004-12-22 2005-11-17 Rollpresse und rollkörper für pressrolle

Country Status (4)

Country Link
EP (1) EP1831456B1 (de)
CA (1) CA2589534C (de)
SE (1) SE528002E (de)
WO (1) WO2006068569A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE530578C2 (sv) * 2006-11-23 2008-07-08 Metso Paper Inc Pressvals för tvättning och/eller avvattning av massa och förfarande för tillverkning eller reparation av sådan pressvals
US9333468B2 (en) 2012-09-24 2016-05-10 Abengoa Bioenergy New Technologies, Llc Soak vessels and methods for impregnating biomass with liquid
SE2051223A1 (en) * 2020-10-21 2021-09-02 Valmet Oy Mounting device for mounting frame rings around a wash press drum core and a method for mounting frame rings

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE355990B (de) * 1966-01-25 1973-05-14 Sunds Ab
SE502437C2 (sv) * 1994-02-07 1995-10-16 Kvaerner Pulping Tech Siltrumma för avvattning och/eller tvättning av cellulosamassa
SE512876C2 (sv) * 1999-06-18 2000-05-29 Kvaerner Pulping Tech Tätningsorgan i en anordning för avvattning av massa

Also Published As

Publication number Publication date
SE0403129L (sv) 2006-06-23
EP1831456A1 (de) 2007-09-12
SE528002C2 (sv) 2006-08-01
CA2589534C (en) 2013-01-08
SE528002E (sv) 2008-11-21
SE0403129D0 (sv) 2004-12-22
CA2589534A1 (en) 2006-06-29
EP1831456A4 (de) 2010-04-07
WO2006068569A1 (en) 2006-06-29

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