WO2004038095A1 - Machine for manufacturing a web of paper or board - Google Patents

Machine for manufacturing a web of paper or board Download PDF

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Publication number
WO2004038095A1
WO2004038095A1 PCT/SE2003/001520 SE0301520W WO2004038095A1 WO 2004038095 A1 WO2004038095 A1 WO 2004038095A1 SE 0301520 W SE0301520 W SE 0301520W WO 2004038095 A1 WO2004038095 A1 WO 2004038095A1
Authority
WO
WIPO (PCT)
Prior art keywords
press
roll
felt
web
machine
Prior art date
Application number
PCT/SE2003/001520
Other languages
French (fr)
Inventor
Leif Helgesson
Original Assignee
Metso Paper Karlstad Ab
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 Karlstad Ab filed Critical Metso Paper Karlstad Ab
Priority to AU2003269752A priority Critical patent/AU2003269752A1/en
Publication of WO2004038095A1 publication Critical patent/WO2004038095A1/en

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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 present invention relates to a machine for manufacturing a continuous web of paper or board, which machine comprises a wet section and a drying section, said wet section including a former and a press section, the press section comprising a double-felted first press including
  • the shoe press roll is arranged uppermost, i.e. in the loop of the first press felt or top felt, whereas the counter roll is situated in the lowermost position, i.e. in the loop of the second press felt or bottom felt . Due to the geometry of the shoe press, i.e. the fact that the shoe of the shoe press surrounds a part of the counter roll, the path of the web is such that it accompanies the bottom felt after the first press nip.
  • the object of the invention is to substantially reduce this problem and provide a machine with a press section in which passage of the web is safe and reliable.
  • the machine in accordance with the invention is characterized in that the counter roll is situated in the loop of the first press felt, in that the shoe press roll is situated in the loop of the second press felt and in that the web is arranged to accompany the first press felt even after the first press nip.
  • both the geometry of the first press and the adhesion of the web to the top felt strive to a passage of the web where the web accompanies the top felt .
  • Figure 1 shows schematically a paper machine with a press section in accordance with the invention.
  • Figure 1 illustrates a machine for manufacturing a continuous web 1 of paper, particularly liner and fluting.
  • the machine comprises a wet section 2 and a drying section 3.
  • the wet section 2 includes a former in the form of a Fourdrinier former 4 and a press section 5.
  • the Fourdrinier former 4 comprises an endless forming wire 6 running in a loop around a couch roll 7 and a belt turning roll 8.
  • the press section 5 comprises a first double-felted press 9 including a shoe press roll 10 and a smooth counter roll 11, which rolls cooperate with each other to form a first press nip 12 between them.
  • the first press 9 also includes a first endless press felt 13 running in a loop through the first press nip 12 around a pickup roll 14, a transfer roll 15 and a plurality of guide rolls 16.
  • the first press 9 also includes a second endless press felt 17 running in a loop through the first press nip 12 around a plurality of guide rolls 18, 19. The first press felt 13 thus forms the top felt of the first press 9, and the second press felt 17 forms the bottom felt of the first press 9.
  • the press section 5 also comprises a second, single-felted press 20 including a first press member 21 in the form of a shoe press roll, and a second press member 22 in the form of a smooth counter roll, which press members cooperate with each other to form a second press nip 23 between them.
  • the counter roll 22 also cooperates with the transfer roll 15 to form a transfer nip 24 between it and the transfer roll 15.
  • the counter roll 22 and the transfer roll 15 thus form a transfer member 25 arranged to transfer the web 1 from the first press 9 to the second press 20.
  • the second press 20 also includes an endless press felt 26 running in a loop through the second press nip 23 around a plurality of guide rolls 27.
  • the drying section 3 comprises an endless drying felt 28 running in a loop around a transfer roll 29 and a plurality of guide rolls 30 (only one of which is shown in Figure 1) , in order to retain the web 1 against a plurality of drying cylinders 31, 32 while the web 1 is running through the drying section 3.
  • the web 1 is formed in the Fourdrinier former 4 in known manner during the manufacture of paper. Between the couch roll 7 and the belt turning roll 8 the first press felt
  • the pickup roll 14 picks up the web 1 from the forming wire 6.
  • the pickup roll 14 is provided with an inner suction box 33 which generates a partial pressure impulse in the top felt 13.
  • the top felt 13 thus also acts as pickup felt and the web 1 accompanies it into the first press nip 12.
  • the second press felt 17, i.e. the bottom felt, joins the web 1 on its lower side, downstream of the pickup roll 14, to support the web 1 when it is carried into the first press nip 12.
  • the counter roll 11 is situated in the loop of the top felt 13 and the shoe press roll 10 in the loop of the bottom felt 17.
  • the counter roll 11 is arranged uppermost and the shoe press roll 10 is arranged lowermost.
  • the geometry of the first press 9 and the natural adhesion of the web 1 to the top felt 13 thus cooperate through this arrangement to induce the web 1 to accompany the top felt 13 even after the press nip 12. A safe and reliable passage of the web is thus obtained between the presses 9, 20 and no measures need be taken to "force" the web towards the transfer nip 2 .
  • the first guide roll 19 after the first press nip 12 can be moved between a raised position, depicted in broken lines in Figure 1, and a lowered position, indicated in unbroken lines. If necessary, therefore, the guide roll 19 can be moved to its raised position, for instance at start-up, so that the bottom felt 17 will support the web 1 between the first press nip 12 and the guide roll 19, thereby further assisting the passage of the web towards the transfer nip 24.
  • the guide roll 19 is preferably in its lowered position to cause the bottom felt 17 to be separated from the web 1 between the first press nip 12 and the guide roll 19, thereby reducing re-wetting of the web 1 by the bottom felt 17.
  • the second press 20 is a conventional single-felted shoe press with the shoe press roll 21 uppermost and the counter roll 22 lowermost.
  • the web 1 continues into the drying section 3 via a short open draw between the counter roll 22 and the transfer roll 29 and is then dried in the usual way in the drying section.
  • the transfer roll 29 can be moved, i.e. its position in relation to the counter roll 22 is adjustable to enable the open draw to be set.
  • a number of doctor blades 34 are arranged near the counter roll 22 and the first drying cylinder 31 in order, if necessary at start-up or operational disturbance for instance, to guide the web 1 to a pulper, not shown, placed below the second press 20.
  • the press section 5 in accordance with the invention is extremely compact, thanks to the passage of the web in the first press 9, and the fact that the counter roll 22 of the second press 20 forms a part of the transfer member 25. It will be understood that this is a great advantage when manufacturing new paper machines. However, it is also a great advantage even when rebuilding press sections in existing paper machines since the volume saved can be used to extend other parts of the paper machine, such as the drying section of the paper machine.
  • the invention has been described above with reference to a press section comprising two shoe presses. However, it will be understood that variants and other embodiments are possible within the scope of the invention.
  • the counter rolls need not be smooth, for instance, but may be fluted or blind-drilled.
  • the press section may comprise more than two presses.
  • Said transfer nip 24 between the transfer roll 15 and the counter roll 22 may have a dewatering function, for instance. It will be understood that the invention is applicable for manufacturing both paper and board, by which is also meant cardboard.

Abstract

A machine for manufacturing a continuous web (1) of paper or board, which machine has a former (4) and a press section (5) with a double-felted first press (9) including a shoe press roll (10) and a counter roll (11), which form a first press nip (12) with each other, a first press felt (13) running in a loop around a pickup roll (14) and through the first press nip so that the web accompanies the first press felt from the pickup roll to the first press nip, and a second press felt (17) running in a loop through the first press nip. In accordance with the invention the counter roll is situated in the loop of the first press felt, the shoe press roll is situated in the loop of the second press felt and the web is arranged to accompany the first press felt even after the first press nip.

Description

Machine for manufacturing a web of paper or board
The present invention relates to a machine for manufacturing a continuous web of paper or board, which machine comprises a wet section and a drying section, said wet section including a former and a press section, the press section comprising a double-felted first press including
- a shoe press roll and a counter roll, which rolls form a first press nip with each other,
- a first press felt running in a loop around a pickup roll and through the first press nip, the web being arranged to accompany the first press felt from the pickup roll to the first press nip, and - a second press felt running in a loop through the first press nip.
In known double-felted presses of the type mentioned above the shoe press roll is arranged uppermost, i.e. in the loop of the first press felt or top felt, whereas the counter roll is situated in the lowermost position, i.e. in the loop of the second press felt or bottom felt . Due to the geometry of the shoe press, i.e. the fact that the shoe of the shoe press surrounds a part of the counter roll, the path of the web is such that it accompanies the bottom felt after the first press nip.
Such a path entails certain problems, however. In a first press of shoe press type approximately 60% dewatering is obtained in the pickup felt, i.e. the top felt and the top felt is therefore relatively wet at the pickup roll. This in turn results in relatively strong adhesion between the web and the top felt, which adhesion remains even after the first press nip. Furthermore, a partial pressure impulse is generated in the top felt at the pickup roll and this partial pressure impulse also remains to a certain extent after the first nip, thereby further increasing the adhesion of the web to the top felt. The geometry of the shoe press thus strives to induce the web to accompany the bottom felt, whereas the adhesion of the web to the top felt strives to induce the web to accompany the top felt, which complicates safe and reliable passage of the web after the first press.
The object of the invention is to substantially reduce this problem and provide a machine with a press section in which passage of the web is safe and reliable.
The machine in accordance with the invention is characterized in that the counter roll is situated in the loop of the first press felt, in that the shoe press roll is situated in the loop of the second press felt and in that the web is arranged to accompany the first press felt even after the first press nip.
In accordance with the invention, thus, both the geometry of the first press and the adhesion of the web to the top felt strive to a passage of the web where the web accompanies the top felt .
The invention will be described more fully in the following with reference to the drawings .
Figure 1 shows schematically a paper machine with a press section in accordance with the invention.
Figure 1 illustrates a machine for manufacturing a continuous web 1 of paper, particularly liner and fluting.
The machine comprises a wet section 2 and a drying section 3. The wet section 2 includes a former in the form of a Fourdrinier former 4 and a press section 5. The Fourdrinier former 4 comprises an endless forming wire 6 running in a loop around a couch roll 7 and a belt turning roll 8.
The press section 5 comprises a first double-felted press 9 including a shoe press roll 10 and a smooth counter roll 11, which rolls cooperate with each other to form a first press nip 12 between them. The first press 9 also includes a first endless press felt 13 running in a loop through the first press nip 12 around a pickup roll 14, a transfer roll 15 and a plurality of guide rolls 16. The first press 9 also includes a second endless press felt 17 running in a loop through the first press nip 12 around a plurality of guide rolls 18, 19. The first press felt 13 thus forms the top felt of the first press 9, and the second press felt 17 forms the bottom felt of the first press 9.
The press section 5 also comprises a second, single-felted press 20 including a first press member 21 in the form of a shoe press roll, and a second press member 22 in the form of a smooth counter roll, which press members cooperate with each other to form a second press nip 23 between them. The counter roll 22 also cooperates with the transfer roll 15 to form a transfer nip 24 between it and the transfer roll 15. The counter roll 22 and the transfer roll 15 thus form a transfer member 25 arranged to transfer the web 1 from the first press 9 to the second press 20. The second press 20 also includes an endless press felt 26 running in a loop through the second press nip 23 around a plurality of guide rolls 27.
The drying section 3 comprises an endless drying felt 28 running in a loop around a transfer roll 29 and a plurality of guide rolls 30 (only one of which is shown in Figure 1) , in order to retain the web 1 against a plurality of drying cylinders 31, 32 while the web 1 is running through the drying section 3.
The web 1 is formed in the Fourdrinier former 4 in known manner during the manufacture of paper. Between the couch roll 7 and the belt turning roll 8 the first press felt
13, i.e. the top felt, picks up the web 1 from the forming wire 6. For this purpose the pickup roll 14 is provided with an inner suction box 33 which generates a partial pressure impulse in the top felt 13. The top felt 13 thus also acts as pickup felt and the web 1 accompanies it into the first press nip 12. The second press felt 17, i.e. the bottom felt, joins the web 1 on its lower side, downstream of the pickup roll 14, to support the web 1 when it is carried into the first press nip 12.
In this embodiment of the invention the counter roll 11 is situated in the loop of the top felt 13 and the shoe press roll 10 in the loop of the bottom felt 17. In other words, the counter roll 11 is arranged uppermost and the shoe press roll 10 is arranged lowermost. The geometry of the first press 9 and the natural adhesion of the web 1 to the top felt 13 thus cooperate through this arrangement to induce the web 1 to accompany the top felt 13 even after the press nip 12. A safe and reliable passage of the web is thus obtained between the presses 9, 20 and no measures need be taken to "force" the web towards the transfer nip 2 .
The first guide roll 19 after the first press nip 12 can be moved between a raised position, depicted in broken lines in Figure 1, and a lowered position, indicated in unbroken lines. If necessary, therefore, the guide roll 19 can be moved to its raised position, for instance at start-up, so that the bottom felt 17 will support the web 1 between the first press nip 12 and the guide roll 19, thereby further assisting the passage of the web towards the transfer nip 24. During normal production, however, the guide roll 19 is preferably in its lowered position to cause the bottom felt 17 to be separated from the web 1 between the first press nip 12 and the guide roll 19, thereby reducing re-wetting of the web 1 by the bottom felt 17.
After the first press nip 12 the web 1 accompanies the top felt 13 to the transfer roll 15 where the web 1, via the transfer nip 24, is transferred to the second press 20. The second press 20 is a conventional single-felted shoe press with the shoe press roll 21 uppermost and the counter roll 22 lowermost.
After the second press nip 23 the web 1 continues into the drying section 3 via a short open draw between the counter roll 22 and the transfer roll 29 and is then dried in the usual way in the drying section. The transfer roll 29 can be moved, i.e. its position in relation to the counter roll 22 is adjustable to enable the open draw to be set. In known manner a number of doctor blades 34 are arranged near the counter roll 22 and the first drying cylinder 31 in order, if necessary at start-up or operational disturbance for instance, to guide the web 1 to a pulper, not shown, placed below the second press 20.
The press section 5 in accordance with the invention is extremely compact, thanks to the passage of the web in the first press 9, and the fact that the counter roll 22 of the second press 20 forms a part of the transfer member 25. It will be understood that this is a great advantage when manufacturing new paper machines. However, it is also a great advantage even when rebuilding press sections in existing paper machines since the volume saved can be used to extend other parts of the paper machine, such as the drying section of the paper machine.
The invention has been described above with reference to a press section comprising two shoe presses. However, it will be understood that variants and other embodiments are possible within the scope of the invention. The counter rolls need not be smooth, for instance, but may be fluted or blind-drilled. Furthermore, the press section may comprise more than two presses. Said transfer nip 24 between the transfer roll 15 and the counter roll 22 may have a dewatering function, for instance. It will be understood that the invention is applicable for manufacturing both paper and board, by which is also meant cardboard.

Claims

C L A I S
1. A machine for manufacturing a continuous web (1) of paper or board, which machine comprises a wet section (2) and a drying section (3) , said wet section (2) including a former (4) and a press section (5) , the press section (5) comprising a double-felted first press (9) including
- a shoe press roll (10) and a counter roll (11) , which rolls (10, 11) form a first press nip (12) with each other,
- a first press felt (13) running in a loop around a pickup roll (14) and through the first press nip (12) , the web (1) being arranged to accompany the first press felt (13) from the pickup roll (14) to the first press nip (12) , and
- a second press felt (17) running in a loop through the first press nip (12) , characterized in that the counter roll (11) is situated in the loop of the first press felt (13) , in that the shoe press roll (10) is situated in the loop of the second press felt (17) and in that the web (1) is arranged to accompany the first press felt (13) even after the first press nip (12) .
2. A machine as claimed in claim 1, characterized in that the counter roll (11) is arranged uppermost so that the first press felt (13) forms the top felt of the first press (9) , and in that the shoe press roll (10) is arranged lowermost so that the second press felt (17) forms the bottom felt of the first press (9) .
3. A machine as claimed in claim 2, characterized in that the first press (9) includes a guide roll (19) situated in the loop of the second press felt (17) downstream of the first press nip (12) , which guide roll (19) is movable between a raised position in which it is arranged to cause the second press felt (17) to support the web (1) between the first press nip (12) and the guide roll (19) , and a lowered position in which the guide roll (19) is arranged to cause the second press felt (17) to be separated from the web (1) between the first press nip (12) and the guide roll (19) .
4. A machine as claimed in any one of claims 1-3, characterized in that the press section (5) also comprises a second press (20) including
- a first press member (21) and a second press member (22) which press members (21, 22) form a second press nip (23) with each other, and
- a press felt (26) running in a loop through the second press nip (23) .
5. A machine as claimed in claim 4, characterized in that the press section (5) also comprises a transfer means (25) arranged to transfer the web (1) from the first press (9) to the second press (20) .
6. A machine as claimed in either of claims 4 or 5, characterized in that the press members (21, 22) in the second press (20) are a shoe press roll and a counter roll .
7. A machine as claimed in claim 6, characterized in that the shoe press roll (21) is arranged uppermost and the counter roll (22) is arranged lowermost.
8. A machine as claimed in claim 7, characterized in that the transfer means (25) includes - a transfer roll (15) located in the loop of the first press felt (13) , and
- the counter roll (22) in the second press (20) , the transfer roll (15) and the counter roll (22) in the second press forming a transfer nip (24) with each other.
9. A machine as claimed in claim 8, characterized in that the transfer nip (24) is dewatering.
10. A machine as claimed in any one of claims 4-9, characterized in that the second press (20) has only one felt.
11. A machine as claimed in any one of claims 4-10, characterized in that after the second press (20) the web (1) is arranged to be transferred to the drying section (3) .
12. A machine as claimed in claim 11, characterized in that after the second press (20) the web (1) is arranged to be transferred to the drying section (3) via an open draw.
13. A machine as claimed in any one of claims 1-11, characterized in that it is intended for the manufacture of line or fluting.
PCT/SE2003/001520 2002-10-25 2003-10-01 Machine for manufacturing a web of paper or board WO2004038095A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003269752A AU2003269752A1 (en) 2002-10-25 2003-10-01 Machine for manufacturing a web of paper or board

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20216498.5 2002-10-25
DE20216498U DE20216498U1 (en) 2002-10-25 2002-10-25 Machine for making a sheet of paper or cardboard

Publications (1)

Publication Number Publication Date
WO2004038095A1 true WO2004038095A1 (en) 2004-05-06

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ID=7976345

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2003/001520 WO2004038095A1 (en) 2002-10-25 2003-10-01 Machine for manufacturing a web of paper or board

Country Status (3)

Country Link
AU (1) AU2003269752A1 (en)
DE (1) DE20216498U1 (en)
WO (1) WO2004038095A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202012012681U1 (en) 2012-08-21 2013-09-26 Voith Patent Gmbh Press section for a machine for producing a fibrous web
EP3026173B1 (en) 2014-11-26 2017-04-05 BillerudKorsnäs AB Method of producing a containerboard from pulp comprising NSSC pulp and corrugated board

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005033529A1 (en) * 2005-07-14 2007-01-18 Voith Patent Gmbh Press arrangement

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5830323A (en) * 1995-06-21 1998-11-03 Voith Sulzer Papiermaschinen Gmbh Apparatus for dewatering a fiber web

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5830323A (en) * 1995-06-21 1998-11-03 Voith Sulzer Papiermaschinen Gmbh Apparatus for dewatering a fiber web

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202012012681U1 (en) 2012-08-21 2013-09-26 Voith Patent Gmbh Press section for a machine for producing a fibrous web
EP3026173B1 (en) 2014-11-26 2017-04-05 BillerudKorsnäs AB Method of producing a containerboard from pulp comprising NSSC pulp and corrugated board
US10850901B2 (en) 2014-11-26 2020-12-01 Billerudkorsnas Ab High-strength fluting from NSSC pulp
EP3026173B2 (en) † 2014-11-26 2022-12-07 BillerudKorsnäs AB Method of producing a containerboard from pulp comprising NSSC pulp
US11814227B2 (en) 2014-11-26 2023-11-14 Billerudkorsnas Ab High-strength fluting from NSSC pulp

Also Published As

Publication number Publication date
AU2003269752A1 (en) 2004-05-13
DE20216498U1 (en) 2003-03-27

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