EP1071847B2 - Papiermaschine und verfahren zur herstellung einer papierbahn - Google Patents

Papiermaschine und verfahren zur herstellung einer papierbahn Download PDF

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Publication number
EP1071847B2
EP1071847B2 EP99910906A EP99910906A EP1071847B2 EP 1071847 B2 EP1071847 B2 EP 1071847B2 EP 99910906 A EP99910906 A EP 99910906A EP 99910906 A EP99910906 A EP 99910906A EP 1071847 B2 EP1071847 B2 EP 1071847B2
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EP
European Patent Office
Prior art keywords
press
felt
pick
paper machine
shoe
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
EP99910906A
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English (en)
French (fr)
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EP1071847B1 (de
EP1071847A1 (de
Inventor
Carl Hakanson
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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Application filed by Metso Paper Oy filed Critical Metso Paper Oy
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Publication of EP1071847B1 publication Critical patent/EP1071847B1/de
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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
    • 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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof

Definitions

  • the present invention relates to a paper machine for manufacturing a continuous paper web, comprising:
  • the paper web is forced in a press section to accompany the clothing, which does not act as pick-up felt.
  • the pick-up felt of the first press also passes through the second press, also provided with an impermeable belt (see US-4,976,821 , for instance), and according to another suggestion only the second press is provided with a pick-up felt which also carries the web after the press nip, but the transfer must then be ensured with the help of a suction shoe (see EP-B1-0 159 280 , for instance).
  • a press section is thus known through US-4,976,821 , where the paper web is picked up from the forming wire with the help of the upper press felt of the first press and is permitted to accompany this pick-up felt after the first press nip.
  • the known press section has only one double-felted press and said upper press felt is also used in the second press, i.e. it passes through both press nips.
  • a press section comprising two double-felted presses, of which the upper press felt of the second press picks up the paper web from the lower press felt of the first press, the latter felt not having been utilized as pick-up felt, and carries the paper web after the press nip where it is transferred to the upper press felt with the aid of a suction shoe.
  • a press section is previously known through EP-A1-0 598 991 which comprises a double-felted shoe press and a single-felted shoe press in which the upper press felt of the first press picks up the paper web from the forming wire and carries the paper web after the press nip, the paper web being transferred to the upper press felt with the aid of a suction shoe.
  • the paper web accompanies the counter roll of the shoe press which has a smooth surface, ensuring that the paper web does not accompany the lower press felt after the second press nip.
  • a suction shoe intended to ensure that the paper web accompanies the press felt which is not the pick-up felt after the press nip, is for some reason put out of function so that the paper web instead accompanies the pick-up felt which has no physical connection with the second press, see for instance EP-B1-0 159 280 , mentioned above.
  • Other measures for ensuring that the paper web accompanies the desired felt have been to have a denser and wetter lower felt if the upper felt is the pick-up felt, or to select some special felt separation to reduce the risk of the paper web accompanying the pick-up felt.
  • the object of the present invention is to provide a paper machine with an improved press section as regards conveying the web through at least two consecutive presses so that the risk of "web theft", i.e. the paper web not accompanying the desired press felt, is greatly reduced and in certain cases, even in most cases of operation, is eliminated.
  • the paper machine according to the invention exhibits the features of claim 1.
  • the press section thus has at least two double-felted presses disposed one after the other.
  • the first press has an upper press member and a lower press member, said press members forming a press nip with each other which is the first press nip of the press section.
  • the first press also has an upper press felt which runs in a loop through the first press nip and a lower press felt which runs in a loop through the first press nip. These upper and lower press felts run only through this first press nip, i.e. they do not run through the press nip of the second press.
  • the second press has an upper press member and a lower press member, said two press members forming a press nip with each other, which is the second press nip in the press section.
  • the second press also has an upper press felt which runs in a loop through the second press nip, and a lower press felt which runs in a loop through the second press nip. These upper and lower press felts run only through this second press nip, i.e. they do not run through the press nip of the first press.
  • Figure 1 shows schematically parts of a paper machine according to a presently preferred embodiment.
  • Figure 1 shows schematically parts of a paper machine for manufacturing a paper web 1.
  • the paper machine comprises a wet section 2, a press section 3 and a drying section 25.
  • the wet section 2 of which only the downstream part is shown in the drawing, comprises a forming wire 4 running in a loop around guide rolls 5 and a forming roll (not shown).
  • the drying section 25 comprises one or more drying cylinders 26.
  • the press section comprises a first double-felted press 6 and a second double-felted press 7.
  • the first double-felted press 6 comprises an upper press member 8 and a lower press member 9, said press members 8, 9 cooperating with each other to define a first press nip N1 between them.
  • the first double-felted press 6 comprises a shoe press in which the upper press member 8 consists of a shoe press roll and the lower press member 9 consists of a counter roll which can be a smooth roll, a grooved roll or a blind-drilled roll. Said first press nip N1 is thus an extended press nip.
  • the first double-felted shoe press 6 comprises an upper, endless press felt 10 which runs in a loop through the first press nip N1, around a plurality of guide rolls 11 and around a pick-up suction roll 12 arranged close to the forming wire 4 in order to form a first transfer zone T1 with this.
  • the upper press felt 10 thus also functions as pick-up felt to pick up and transfer the paper web 1 from the forming wire 4 to the upper press felt 10.
  • the guide roll 5, which is situated upstream and nearest the transfer zone T1 may be a suction roll if so desired.
  • the first double-felted shoe press 6 comprises a lower, endless press felt 13 which runs in a loop through the first press nip N1 around a plurality of guide rolls 14.
  • the loop of the lower press felt 13 is free from suction devices at the points where the press felt 13 is in contact with or substantially in contact with the paper web, at least in and after the press nip N1.
  • the second double-felted press 7 comprises an upper press member 15 and a lower press member 16, said press members 15, 16 cooperating with each other to define a second press nip N2 between them.
  • the second double-felted press 7 also comprises a shoe press in which the lower press member 16 consists of a shoe press roll and the upper press member 15 consists of a counter roll which can be a smooth roll, a grooved roll or a blind-drilled roll. Said second press nip N2 is thus also an extended press nip.
  • the second double-felted shoe press 7 comprises an upper, endless press felt 17 which runs in a loop through the second press nip N2 around a plurality of guide rolls 18.
  • the loop of the upper press felt 17 is also free from suction devices at the points where the press felt 17 is in contact with or substantially in contact with the paper web, at least in and after the press nip N2.
  • the second double-felted shoe press 7 comprises a lower, endless press felt 19 which runs in a loop through the second press nip N2 around a plurality of guide rolls 20 and around a pick-up suction roll 21 disposed close to the upper press felt 10 of the first double-felted shoe press to form a second transfer zone T2 with this.
  • the lower press felt 19 thus also functions as pick-up felt to pick up and transfer the paper web 1 from the upper press felt 10 of the first double-felted shoe press 6 to the lower press felt 19.
  • An endless clothing 22 is arranged downstream of the second double-felted shoe press 7 and runs in a loop around a plurality of guide rolls (not shown) and around a pick-up suction roll 23 arranged close to the lower press felt 19 of the second double-felted shoe press 7 to form a third transfer zone T3 with this.
  • the reference number 24 denotes a suction device, such as a suction box or suction shoe, arranged in the loop of the upper press felt 10 of the first press 6 downstream of the press nip N1. It is represented by broken lines to indicate that it is not necessary under normal operating circumstances, or in most operating circumstances, in order to achieve the object of the invention, which is for the paper web 1 to accompany the pick-up felt 10 also after the press nip N1 without external measures such as suction devices.
  • the suction device 24 may be operated temporarily during the initial stage after changing a press felt, for instance, until the press felt has become sealed resulting in increased adhesion ability of the paper web thereto. It may also be used under difficult production circumstances entailing low grammage and high speeds.
  • the shoe press roll 8, 16 is arranged in the loop formed by the press felt 10 or 19, respectively, which also functions as pick-up and transfer felt since this avoids the problem discussed in the introduction, viz. the paper web having a tendency to be drawn towards the opposite press felt when the shoe press roll is arranged in the loop of this press felt.
  • the felts 10, 13 and 17, 19 are separated from each other immediately after the press nip N1 and press nip N2, respectively. It is also preferred that the press felt 10 used as both pick-up felt and transfer felt in the first press 6 is guided away from the paper web at the end of the transfer zone T2 or immediately thereafter. The same applies to the press felt 19 at its transfer zone T3.
  • first and second in the expression “first and second double-felted presses” and similar expressions are intended only to indicate the mutual relationship between the at least two consecutive presses 6, 7 and are not intended to exclude at least one additional press before the first double-felted press 6 and at least one additional press after the second double-felted press 7.
  • Each such additional press may consist of a press of any kind suitable for combining with the press configurations according to the invention.
  • the additional press or presses is/are preferably of the same configuration as the first press 6 and/or the second press 7, depending on its/their position(-s) in the press section.
  • the press section according to the invention has what is known as inverted web run, where the paper web in all presses is allowed to accompany the pick-up felt even after the press nip so that alternately one side of the paper web (the upper side in Figure 1 ) is in contact with the pick-up felt of a certain press and its other side (the lower side in Figure 1 ) is in contact with the pick-up felt of a preceding or subsequent press.
  • the first press has a separate upper press felt and a separate lower press felt, these press felts running through the first press nip
  • the second press has a separate lower press felt and a separate upper press felt, which two latter press felts run through the second press nip.
  • the lower press felt in the second press nip is a different felt from the lower press felt in the first press nip. The same applies to the two upper press felts. Each press felt thus runs through only one press nip.

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  • Paper (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)

Claims (15)

  1. Papiermaschine zum Herstellen einer kontinuierlichen Papierbahn (1) mit:
    - einer Nasspartie (2),
    - einer Pressenpartie (3) mit zumindest zwei aufeinanderfolgenden d. h. einer ersten und einer zweiten Doppelfilzpresse (6, 7), von denen jede ein oberes Pressenelement (8, 15) und ein unteres Pressenelement (9, 16) aufweist, wobei die Pressenelemente (8, 9; 15, 16) jeweils einen ersten beziehungsweise einen zweiten Pressenspalt (N1, N2) miteinander ausbilden, einem oberen Pressfilz (10, 17), der in einer Schleife durch den ersten Pressenspalt (N1) beziehungsweise den zweiten Pressenspalt (N2) jeweils läuft, und einem unteren Pressfilz (13, 19), der in einer Schleife durch den ersten Pressenspalt (N1) beziehungsweise den zweiten Pressenspalt (N2) jeweils läuft,
    - einer Trockenpartie (25),
    - einem Gewebe (4), das stromaufwärtig von der ersten Presse (6) angeordnet ist,
    - einem Gewebe (22), das stromabwärtig von der zweiten Presse (7) angeordnet ist,
    - einer ersten Übertragungszone (T1), die zwischen dem stromaufwärtig angeordneten Gewebe (4) und der ersten Presse (6) angeordnet ist,
    - einer zweiten Übertragungszone (T2), die zwischen der ersten Presse (6) und der zweiten Presse (7) angeordnet ist, und
    - einer dritten Übertragungszone (T3), die zwischen der zweiten Presse (7) und dem stromabwärtig angeordneten Gewebe (22) angeordnet ist, wobei einer der Pressfilze (10, 13, 17, 19) bei sowohl der ersten als auch der zweiten Presse (6, 7) in einer abwechselnden Beziehung zwischen den Pressen (6, 7) so eingerichtet ist, dass er die Papierbahn (1) in der Übertragungszone (T1, T2,) aufnimmt, die sich stromaufwärtig von dem Pressenspalt (N1, N2) befindet, der zu ihm gehört, und die Pressfilze (10, 19), die als Aufnahmefilze verwendet werden, auch so eingerichtet sind, dass sie die Papierbahn (1) von dem Pressenspalt (N1, N2), der zu ihm gehört, zu der folgenden Übertragungszone (T2, T3) befördern und übertragen, sowohl die erste als auch die zweite Presse (6, 7) Schuhpressen (6, 7) sind und ein Pressenelement (8, 16) von den beiden Schuhpressen (6, 7) eine Schuhpresswalze (8, 16) ist,
    dadurch gekennzeichnet, dass
    die Schuhpresswalze (8, 16) von sowohl der ersten als auch der zweiten Schuhpresse (6, 7) in der Schleife angeordnet ist, die durch den Pressfilz (10, 19) ausgebildet ist, der auch als Aufnahme- und Übertragungsfilz wirkt.
  2. Papiermaschine gemäß Anspruch 1,
    dadurch gekennzeichnet, dass
    der Pressfilz (10) von zumindest der ersten Presse (6), der sowohl als Aufnahmefilz als auch als Übertragungsfilz verwendet wird, so eingerichtet ist, dass er von der Papierbahn an einer Stelle stromaufwärtig von und bei einem Abstand von dem zweiten Pressenspalt (N2) weg geführt wird.
  3. Papiermaschine gemäß Anspruch 1 oder 2,
    dadurch gekennzeichnet, dass
    das Gewebe (4), das stromaufwärtig von der ersten Presse (6) angeordnet ist, ein Bahnbildungssieb bei der Nasspartie (2) bildet.
  4. Papiermaschine gemäß einem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet, dass
    die erste Übertragungszone (T1) eine Aufnahmesaugvorrichtung (12) aufweist, die in der Schleife des Pressfilzes (10) angeordnet ist, der als ein Aufnahmefilz verwendet wird.
  5. Papiermaschine gemäß Anspruch 4,
    dadurch gekennzeichnet, dass
    die Aufnahmesaugvorrichtung (12) eine Aufnahmesaugwalze oder ein -schuh ist.
  6. Papiermaschine gemäß einem der Ansprüche 1 bis 5,
    dadurch gekennzeichnet, dass
    das Gewebe (22), das stromabwärtig von der zweiten Presse angeordnet ist, aus einem Aufnahme- und Übertragungsgewebe zum Aufnehmen und Übertragen der Papierbahn (1) zu der Trockenpartie 25 der Papiermaschine besteht.
  7. Papiermaschine gemäß Anspruch 6,
    dadurch gekennzeichnet, dass
    die dritte Übertragungszone (T3) eine Aufnahmesaugvorrichtung (23) aufweist, die in der Schleife des Aufnahme- und Übertragungsgewebes (22) angeordnet ist.
  8. Papiermaschine gemäß Anspruch 7,
    dadurch gekennzeichnet, dass
    die Aufnahmesaugvorrichtung (23) eine Aufnahmesaugwalze oder ein -schuh ist.
  9. Papiermaschine gemäß einem der Ansprüche 1 bis 8,
    dadurch gekennzeichnet, dass
    die zweite Übertragungszone (T2) eine Aufnahmesaugvorrichtung (21) aufweist, die in der Schleife des als Aufnahmefilz verwendeten Pressfilzes (19) angeordnet ist, wobei an der Aufnahmesaugvorrichtung (21) die beiden Pressfilze (10, 19), die als Übertragungsfilze verwendet werden, zusammenlaufen, um anschließend an dem Ende der oder sofort nach der Übertragungszone (T2) erneut voneinander auseinanderzulaufen.
  10. Papiermaschine gemäß Anspruch 9,
    dadurch gekennzeichnet, dass
    die Aufnahmesaugvorrichtung (21) eine Aufnahmesaugwalze oder ein -schuh ist.
  11. Papiermaschine gemäß Anspruch 9 oder 10,
    dadurch gekennzeichnet, dass
    die Papierbahn (1) so eingerichtet ist, dass sie bei einem linearen oder im wesentlichen linearen Lauf zwischen den beiden Pressspalten (N1, N2) befördert wird, wobei die Papierbahn (1) tangential oder im wesentlichen tangential zu dem Krümmungsradius der Aufnahmesaugvorrichtung (21) innerhalb der Übertragungszone (T2) vor und nach dieser ist.
  12. Papiermaschine gemäß Anspruch 1,
    dadurch gekennzeichnet, dass
    das zweite Pressenelement (9, 15) der Schuhpressen (6, 7) eine Gegenwalze in der Form einer glatten Walze, einer mit Nuten versehenen Walze oder einer mit Sacklöchern versehenen Walze ist.
  13. Papiermaschine gemäß einem der Ansprüche 1 bis 12,
    dadurch gekennzeichnet, dass
    zumindest die erste Presse (6) eine Saugvorrichtung (24) aufweist, die stromabwärtig von dem Pressspalt (N1) in der Schleife angeordnet ist, die durch den Pressfilz (10) ausgebildet ist, der auch als Aufnahme- und Übertragungsfilz wirkt.
  14. Papiermaschine gemäß einem der Ansprüche 1 bis 13,
    dadurch gekennzeichnet, dass
    die Pressfilze (10, 19), die ebenfalls als Aufnahme- und Übertragungsfilze wirken, aus dem oberen Pressfilz (10) der ersten Presse (6) und aus dem unteren Pressfilz (19) der zweiten Presse (7) bestehen.
  15. Papiermaschine gemäß einem der Ansprüche 1 bis 14,
    dadurch gekennzeichnet, dass
    das obere Pressenelement der ersten Presse (6) die Schuhpresswalze (8) bildet und das untere Pressenelement der zweiten Presse (7) die Schuhpresswalze (16) bildet.
EP99910906A 1998-03-16 1999-03-10 Papiermaschine und verfahren zur herstellung einer papierbahn Expired - Lifetime EP1071847B2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9800867A SE511667C2 (sv) 1998-03-16 1998-03-16 Pappersmaskin och sätt för framställning av en pappersbana
SE9800867 1998-03-16
PCT/SE1999/000361 WO1999047747A1 (en) 1998-03-16 1999-03-10 Paper machine and method of manufacturing a paper web

Publications (3)

Publication Number Publication Date
EP1071847A1 EP1071847A1 (de) 2001-01-31
EP1071847B1 EP1071847B1 (de) 2003-02-19
EP1071847B2 true EP1071847B2 (de) 2010-01-27

Family

ID=20410568

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Application Number Title Priority Date Filing Date
EP99910906A Expired - Lifetime EP1071847B2 (de) 1998-03-16 1999-03-10 Papiermaschine und verfahren zur herstellung einer papierbahn

Country Status (5)

Country Link
EP (1) EP1071847B2 (de)
AT (1) ATE232920T1 (de)
DE (1) DE69905457T3 (de)
SE (1) SE511667C2 (de)
WO (1) WO1999047747A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10226825A1 (de) * 2002-06-15 2003-12-24 Voith Paper Patent Gmbh Pressanordnung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29701382U1 (de) † 1997-01-28 1997-03-20 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Pressenpartie einer Papiermaschine
EP0930392A2 (de) † 1998-01-20 1999-07-21 Voith Sulzer Papiertechnik Patent GmbH Pressenpartie

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4561939A (en) * 1984-03-26 1985-12-31 Beloit Corporation Extended nip press arrangement
FI842114A (fi) * 1984-05-25 1985-11-26 Valmet Oy Pressparti med separata presszon i en pappersmaskin.
ATE133217T1 (de) * 1992-11-24 1996-02-15 Voith Gmbh J M Pressenpartie für eine papiermaschine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29701382U1 (de) † 1997-01-28 1997-03-20 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Pressenpartie einer Papiermaschine
EP0930392A2 (de) † 1998-01-20 1999-07-21 Voith Sulzer Papiertechnik Patent GmbH Pressenpartie

Also Published As

Publication number Publication date
EP1071847B1 (de) 2003-02-19
SE9800867D0 (sv) 1998-03-16
DE69905457D1 (de) 2003-03-27
EP1071847A1 (de) 2001-01-31
SE9800867L (sv) 1999-09-17
WO1999047747A1 (en) 1999-09-23
ATE232920T1 (de) 2003-03-15
SE511667C2 (sv) 1999-11-08
DE69905457T2 (de) 2003-09-11
DE69905457T3 (de) 2010-07-08

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