EP1238148B1 - Pressvorrichtung mit verlängerter presszone zum pressen einer laufenden papier- oder kartonbahn - Google Patents

Pressvorrichtung mit verlängerter presszone zum pressen einer laufenden papier- oder kartonbahn Download PDF

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Publication number
EP1238148B1
EP1238148B1 EP00983448A EP00983448A EP1238148B1 EP 1238148 B1 EP1238148 B1 EP 1238148B1 EP 00983448 A EP00983448 A EP 00983448A EP 00983448 A EP00983448 A EP 00983448A EP 1238148 B1 EP1238148 B1 EP 1238148B1
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EP
European Patent Office
Prior art keywords
cylinder
press
shoe
length
press device
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
EP00983448A
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English (en)
French (fr)
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EP1238148A1 (de
Inventor
Jorma Snellman
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
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Publication date
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Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP1238148A1 publication Critical patent/EP1238148A1/de
Application granted granted Critical
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Anticipated expiration legal-status Critical
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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
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses

Definitions

  • the press device according to the invention particularly advantageously can be utilised for wet-pressing of moist paper or paperboard webs, but also for calendering or other finishing of dried paper or paperboard.
  • the press device according to the invention can also be utilised for other fibre webs than paper and paperboard.
  • the patent publication US 4,917,768 discloses a previously known shoe press device in which the press shoe is supported via tubular sleeves rigidly affixed to and spaced apart on a support in a direction across the machine direction. Thereby, the sleeves are received in cylindrical recesses in the press shoe in order to allow the press shoe to move toward or from a counter roll and the nip pressure to be varied.
  • the disclosed shoe press comprises hydraulic jacks upstream and downstream the sleeves for forcing the press shoe against the counter roll and for pivoting the shoe around an axis across the machine in order to vary the nip pressure in the machine direction.
  • the two-part member consists of first and second cylinders, while the coupler comprises a piston which is slidably received in the two cylinders.
  • the two-part member instead comprises first and second pistons, while the coupler comprises a cylinder which surrounds both pistons.
  • the press shoe In order to control the conditions in the nip of a shoe press, such as the pressure profile (curve) through the nip, it is usually desirable to be able to move to the press shoe forward or backwards in the machine direction in order to be able to influence the pressure profile through the nip so that the nip pressure is highest in the beginning and lower in the end of the nip, or vice versa.
  • the press shoe in principle, will follow an arc-shaped path with its centre in the central axis of the counter roll. This may result in a skewness in the machine direction between the parts included in the loading cylinders, i.e.
  • the first object of the present invention is to provide a press device having an extended nip for pressing a running paper or paperboard web in which the press shoe unintentionally or intentionally can be tilted/pivoted around an imaginary axis across the machine direction with minimum skewness between the parts included in the loading cylinders, and without generating any excessively large forces directed towards a possible shoe support or the press shoe becoming unstable if the forces are directed against the machine direction (away from a possible shoe support).
  • this first object of the present invention is achieved by means of a press device comprising a press shoe aligned across the machine direction arranged for forming an extended nip in cooperation with a backing member for passage of the web during the pressing, a support which supports the press shoe in a movable way in a direction toward the backing member via aplurality of loading cylinders spaced apart along the press shoe for enabling application of pressure on the web during the pressing.
  • Each of the loading cylinders comprises a first cylinder member having a first cylinder end which is attached to or integrated in the press shoe, and a second cylinder member having a second cylinder end which is attached to or integrated in the support, which first and second cylinder members are slidably connectedby a connecting member.
  • Each of the above-mentioned loading cylinders 106 comprises a first cylinder member 107 having a first cylinder end 108 which is attached to or integrated in the press shoe 101, and a second cylinder member 109 having a second cylinder end 110 which is attached to or integrated in the support 105.
  • the first and second cylinder members 107, 109 are slidably connected by a connecting member 111, wherein the connecting member 111 and the first cylinder member 107 are movable in relation to each other with a first length of stroke L1, while the connecting member 111 and the second cylinder member 109 are movable in relation to each other with a second length of stroke L2, and the connecting member has a third length L3.
  • length of stroke should be understood as the maximum length of a cylinder member available for sliding displacement of a second, cooperating member in relation to said cylinder member.
  • the first length of stroke L1 is less than half of the second length of stroke L2.
  • connection is arranged in such a way that a central axis C1 of the first cylinder member 107 and a central axis C3 of the connecting member 111 can be tilted to an angle in relation to each other and to a central axis C2 of the second 109 cylinder member during an intentional or unintentional tilting of the press shoe 101 during the pressing.
  • first L1 and second L2 lengths of stroke, the third length L3, and the geometrical positions of the contacting seals 112,113 are adapted in order to minimise the angle A2 between the central axis C3 of the connecting member and the central axis C2 of the second cylinder member during the tilting.
  • the above-mentioned tilting either can be intentional or unintentional.
  • the seals 112, 113 can advantageously be of the type disclosed in the above-discussed EP 0 933 471.
  • the connecting member can have different geometrical shapes.
  • the backing member 102 is a rotatable counter roll
  • a flexible belt 118 is arranged in an endless loop for running between the press shoe 101 and the paper or paperboard web 104 during the pressing.
  • the flexible belt preferably has the shape of a sleeve.
  • the press device having an extended nip according to the invention preferably is intended for wet-pressing, or for calendering a paper or paperboard web.
  • Fig. 1A shows a shoe press device with its press shoe in a first position, intended to generate a substantially symmetrical pressure curve through the nip.
  • the intentional displacement of the press shoe 1 into the second position shown in Fig. 1B is intended to displace the pressure maximum of the pressure curve towards the end of the nip, wherein the press shoe 1 and, consequently, the central axis c1 of the therewith associated first cylinder member 7 will be tilted forwards in the machine direction MD to an angle a1 in relation to the central axis c2 of the second cylinder member 9.
  • the angles shown in the drawings for reasons of clarity, have been exaggerated.
  • Figs. 2A and 2B instead illustrate a press device having an extended nip according to a preferred embodiment of the invention.
  • Fig. 2A shows the press device with its press shoe in a first position similar to the first position in Fig. 1A
  • Fig. 2B shows the press device with its press shoe intentionally moved into a second position similar to the second position in Fig. 1B.
  • the press shoe 101 has been intentionally tilted approximately as much as the press shoe 1 in Fig. 1B in order to make it possible to obtain a higher nip pressure in the end of the nip than in its beginning. Accordingly, the angle A1 between the central axis C1 of the first cylinder member 107 and the central axis C2 of the second cylinder member 109 is approximately as large as the angle a1 in Fig. 1B.
  • the angle A2 between the central axis C3 of the connecting member 111 and the central axis C2 of the second cylinder member 109 now becomes significantly smaller than the corresponding angle a2 between the central axes c2 and c3 in Fig. 1B.
  • the minimization, i.e. reduction or even elimination, of the angle A2 which is achieved by means of the present invention reduces or even eliminates the force components in the machine direction MD, originating from pressurisation of the working chamber 114, which are exercised by the press shoe 101 on the shoe support 118.

Landscapes

  • Paper (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Advancing Webs (AREA)

Claims (14)

  1. Pressvorrichtung mit einer verlängerten Presszone zum Pressen einer laufenden Papier- oder Kartonbahn, die einen quer zur Maschinenrichtung (MD) ausgerichteten Pressschuh (101) zur Bildung einer verlängerten Presszone (103) im Zusammenspiel mit einem Gegenelement (102) zum Durchzug der genannten Bahn (104) während des Pressens, eine Stütze (105), die den Pressschuh in einem in einer Richtung zum Gegenelement beweglichen Zustand mittels einer Mehrzahl von Belastungszylindern (106) trägt, die einzeln entlang des Pressschuhes (101) verteilt sind, um Druckausübung auf die Bahn während des Pressens zu ermöglichen, wobei jeder der Belastungszylinder (106) ein erstes Zylinderelement (107), das ein erstes Zylinderende (108) hat, das am Pressschuh (101) befestigt oder im Pressschuh (101) integriert ist, und ein zweites Zylinderelement (109), das ein zweites Zylinderende (110) hat, das an der Stütze (105) befestigt oder in der Stütze (105) integriert ist, umfasst, wobei erstes und zweites Zylinderelement (107, 109) gleitbar durch ein Verbindungselement (111) verbunden sind, wobei das Verbindungselement (111) und das erste Zylinderelement (107) beweglich in Beziehung zueinander mit einer ersten Hublänge (L1) sind, während das Anschlusselement (111) und das zweite Zylinderelement (109) beweglich in Bezug zueinander mit einer zweiten Hublänge (L2) sind, und das Verbindungselement eine dritte Länge (L3) hat, umfasst, dadurch gekennzeichnet, dass die erste Hublänge (L1) kleiner als die zweite Hublänge (L2) ist.
  2. Pressvorrichtung mit einer verlängerten Presszone nach Anspruch 1, dadurch gekennzeichnet, dass die erste Hublänge (L1) kleiner als die Hälfte der zweiten Hublänge (L2) ist.
  3. Pressvorrichtung mit einer verlängerten Presszone nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die dritte Länge (L3) größer als sowohl die erste (L1) als auch die zweite (L2) Hublänge ist.
  4. Pressvorrichtung mit einer verlängerten Presszone nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die dritte Länge (L3) größer als die erste (L1) und die zweite (L2) Hublänge zusammen ist.
  5. Pressvorrichtung mit einer verlängerten Presszone nach einem der vorhergehenden Ansprüche, wobei das Verbindungselement (111) das erste (107) und das zweite (109) Zylinderelement gleitbar in einem abgedichteten Zustand mittels Kontaktdichtungen (112, 113) verbindet, um mindestens eine Arbeitskammer (114) zu bilden, in der der Druck eines druckfesten Mediums verringert werden kann, um eine Stauchung des Belastungszylinders (106) zu erzeugen, oder in der der Druck eines druckfesten Mediums vergrößert werden kann, um eine Dehnung des Belastungszylinders (106) zu erzeugen, und solchermaßen verbindet, dass eine Mittelachse (C1) des ersten Zylinderelementes (107) und eine Mittelachse (C3) des Verbindungselementes (111) um einen Winkel in Beziehung zueinander und zu einer Mittelachse (C2) des zweiten (109) Zylinderelementes während eines absichtlichen oder unabsichtlichen Kippens des Pressschuhes (101) während des Pressens gekippt werden können, dadurch gekennzeichnet, dass die erste (L1) und die zweite (L2) Hublänge, die dritte Länge (L3) und die geometrischen Positionen der Kontaktdichtungen (112, 113) angepasst sind, um den Winkel (A2) zwischen der Mittelachse (C3) des Verbindungselementes und der Mittelachse (C2) des zweiten Zylinderelementes während des Kippens zu minimieren.
  6. Pressvorrichtung mit einer verlängerten Presszone nach einem der vorhergehenden Ansprüche, wobei eine Schuhstütze (115) an der Stütze befestigt ist, um Kräfte in der Maschinenrichtung (MD) aufzunehmen, die durch den Pressschuh (101) bei Berührung mit der Schuhstütze während des Pressens ausgeübt werden, dadurch gekennzeichnet, dass ein oder mehrere Haltemittel (116) auf dem ersten Zylinderelement (107) und/oder auf dem Verbindungselement (111) angeordnet sind, um einen maximalen Wert der ersten Hublänge (L1) abzugrenzen.
  7. Pressvorrichtung mit einer verlängerten Presszone nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass das erste Zylinderelement (107) ein offenes drittes Zylinderende (116) dem ersten Zylinderende (108) gegenüberliegend umfasst und das zweite Zylinderelement (109) ein offenes viertes Zylinderende (117) dem zweiten Zylinderende (110) gegenüberliegend umfasst, wobei das dritte (116) und vierte Zylinderende (117) ein betreffendes Ende des Verbindungselementes (111) umschließt, um die Arbeitskammer (114) oder mehrere Arbeitskammern zu bilden.
  8. Pressvorrichtung mit einer verlängerten Presszone nach Anspruch 7, dadurch gekennzeichnet, dass das Verbindungselement (111) eine im Wesentlichen zylindrische Hülse ist, deren Inneres einen Anteil der Arbeitskammer (114) ausmacht.
  9. Pressvorrichtung mit einer verlängerten Presszone nach Anspruch 7, dadurch gekennzeichnet, dass das Verbindungselement ein stabiler, im Wesentlichen zylindrischer Körper ist, an dessen beiden Enden eine Arbeitskammer gebildet ist.
  10. Pressvorrichtung mit einer verlängerten Presszone nach Anspruch 9, dadurch gekennzeichnet, dass der zylindrische Körper einen Kanal oder mehrere Kanäle zwischen den beiden Enden zur Druckverbindung zwischen den Arbeitskammern umfasst.
  11. Pressvorrichtung mit einer verlängerten Presszone nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass das erste und das zweite Zylinderelement stabile, im Wesentlichen zylindrische Körper, deren eines Ende durch das Verbindungselement umschlossen wird, um die Arbeitskammer zu bilden, wobei die Dichtungsmittel auf dem Verbindungselement angeordnet sind.
  12. Pressvorrichtung mit einer verlängerten Presszone nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Gegenelement (102) eine drehbare Gegenwalze ist, wobei ein flexibles Band (118), vorzugsweise in der Form einer Hülse, in einer Endlosschleife angeordnet ist, um zwischen dem Pressschuh (101) und der Papier- oder Kartonbahn (104) während des Pressens zu laufen.
  13. Verwendung einer Pressvorrichtung mit einer verlängerten Presszone nach einem der Ansprüche 1 bis 12 zum Nasspressen einer Papier- oder Kartonbahn.
  14. Verwendung einer Pressvorrichtung mit einer verlängerten Presszone nach einem der Ansprüche 1 bis 12 zum Kalandrieren einer Papier- oder Kartonbahn.
EP00983448A 1999-12-10 2000-12-07 Pressvorrichtung mit verlängerter presszone zum pressen einer laufenden papier- oder kartonbahn Expired - Lifetime EP1238148B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9904537 1999-12-10
SE9904537A SE515484C2 (sv) 1999-12-10 1999-12-10 Pressanordning med förlängt pressnyp för pressning av en löpande papper- eller kartongbana
PCT/IB2000/001997 WO2001042559A1 (en) 1999-12-10 2000-12-07 Press device having an extended press nip for pressing a traveling paperboard web

Publications (2)

Publication Number Publication Date
EP1238148A1 EP1238148A1 (de) 2002-09-11
EP1238148B1 true EP1238148B1 (de) 2005-03-23

Family

ID=20418088

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00983448A Expired - Lifetime EP1238148B1 (de) 1999-12-10 2000-12-07 Pressvorrichtung mit verlängerter presszone zum pressen einer laufenden papier- oder kartonbahn

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Country Link
EP (1) EP1238148B1 (de)
JP (1) JP4838473B2 (de)
CN (1) CN1181245C (de)
AT (1) ATE291660T1 (de)
AU (1) AU2020201A (de)
CA (1) CA2392520C (de)
DE (1) DE60018970T2 (de)
SE (1) SE515484C2 (de)
WO (1) WO2001042559A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI118088B (fi) * 2004-02-19 2007-06-29 Vaahto Oy Kenkäpuristimen kuormituslaite
FI126727B (fi) * 2012-10-19 2017-04-28 Valmet Technologies Inc Kenkätela, pitkänippipuristin ja kuiturainakone
IT202000020926A1 (it) * 2020-09-03 2022-03-03 A Celli Paper Spa Pressa a scarpa per carta e relativo metodo

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT360831B (de) * 1977-12-20 1981-02-10 Escher Wyss Ag Hydraulisches stuetzelement
CH659865A5 (de) * 1982-07-30 1987-02-27 Escher Wyss Ag Hydrostatisches stuetzelement und dessen verwendung in einer walzvorrichtung.
SE461171C (sv) * 1988-05-25 1992-08-17 Valmet Paper Machinery Inc Press med laangt nyp foer pappers- eller kartongmaskiner
FI87484C (fi) * 1988-12-15 1993-01-11 Valmet Paper Machinery Inc Stoedarrangemang foer boejningskompenserad vals
DE29900914U1 (de) * 1998-01-30 1999-12-23 Valmet Corp., Helsinki Schuhpresse

Also Published As

Publication number Publication date
JP4838473B2 (ja) 2011-12-14
JP2003516482A (ja) 2003-05-13
CN1181245C (zh) 2004-12-22
CA2392520C (en) 2009-02-10
CN1409785A (zh) 2003-04-09
CA2392520A1 (en) 2001-06-14
EP1238148A1 (de) 2002-09-11
WO2001042559A1 (en) 2001-06-14
WO2001042559A9 (en) 2002-11-28
SE9904537D0 (sv) 1999-12-10
SE9904537L (sv) 2001-06-11
ATE291660T1 (de) 2005-04-15
DE60018970D1 (de) 2005-04-28
DE60018970T2 (de) 2006-01-19
SE515484C2 (sv) 2001-08-13
AU2020201A (en) 2001-06-18

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