EP1334231B1 - Press section of a board machine provided with a pre-press and method for removing water from a web in such a press section - Google Patents
Press section of a board machine provided with a pre-press and method for removing water from a web in such a press section Download PDFInfo
- Publication number
- EP1334231B1 EP1334231B1 EP01982503A EP01982503A EP1334231B1 EP 1334231 B1 EP1334231 B1 EP 1334231B1 EP 01982503 A EP01982503 A EP 01982503A EP 01982503 A EP01982503 A EP 01982503A EP 1334231 B1 EP1334231 B1 EP 1334231B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- press
- nip
- roll
- web
- water
- 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
Links
Images
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 press section of a board machine provided with a pre-press according to the preamble of claim 1.
- the invention also relates to a method for removing water from a web in a press section of a board machine provided with a pre-press according to the preamble of claim 8.
- a separate press nip means a press nip in which opposing press members form only one press nip.
- the separate press nip may be a roll nip or an extended nip.
- a separate press nip there is a press which is provided with a centre roll and in which the centre roll forms press nips with at least two other rolls.
- the function of the press section is to remove water from a web and make the web symmetric, so that the absorption and roughness properties of both sides of the web are symmetric.
- the press section should be simple and efficient enough in order that it might be applied to several board grades.
- the travel of the web in the press section should be as straight as possible.
- the water-containing and weak web arriving at the press section does not withstand the dynamic forces produced by high speeds and changes of direction, but there are web breaks and other operational malfunctions, which cause shutdowns.
- a pre-press nip is formed between a hollow-faced lower roll placed inside the loop of a forming wire and an upper shoe roll placed outside the loop of the forming wire.
- a substantially non-water-receiving, smooth-faced transfer belt runs on the side of the upper shoe roll, by means of which belt the web is transferred from the pre-press nip onto a lower press felt of the first press nip proper. Removal of water takes place in the pre-press nip, which forms an extended nip, only in one direction, i.e. through the forming wire into the shell of the hollow-faced roll.
- a pre-press nip is formed between a lower hollow-faced roll placed inside the loop of a forming wire and an upper shoe roll placed outside the loop of the forming wire.
- a press felt runs on the side of the upper shoe roll. Water is removed in the pre-press nip, which forms an extended nip, in two directions, i.e. through the forming wire into the shell of the lower hollow-faced roll and into the upper press felt.
- the transfer of the web to the press section proper takes place on a pick-up roll from the forming wire after the pre-press nip.
- a first pre-press nip is formed between a hollow-faced first lower roll placed inside the loop of a forming wire and a smooth-faced first upper roll placed outside the loop of the forming wire.
- a second pre-press nip is formed between a smooth-faced second lower roll placed inside the loop of the forming wire and a hollow-faced second upper roll placed outside the loop of the forming wire. The web runs in both pre-press nips between the lower forming wire and an upper wire running over the upper rolls.
- Removal of water takes place in the first pre-press nip mainly through the forming wire into the shell of the first lower hollow-faced roll and in the second pre-press nip mainly through the upper wire into the shell of the second upper hollow-faced roll. Both pre-press nips are roll nips. The transfer of the web to the press section proper takes place on a pick-up roll from the forming wire after the second pre-press nip.
- a high basis weight is meant here a basis weight which is over 100 g/m 2 , advantageously over 200 g/m 2 .
- the press section according to the invention is mainly characterised by the characterising part of claim 1.
- the method for removing water in a press section according to the invention is mainly characterised by the characterising part of claim 8.
- a pre-press nip serving as a first press nip is formed between an inner roll placed inside the loop of a forming wire and an outer roll placed outside the loop of the forming wire.
- the pre-press nip is an extended nip which is formed between a shoe roll and a counter roll.
- An extended nip provides a higher dry solids content than a roll nip because of a longer nip and a higher linear load.
- Two separate press fabrics are used as an upper press fabric in the pre-press nip.
- a press fabric that receives water very well is placed against the outer roll and a press fabric that is highly permeable to water is placed against the outer surface of this water-receiving press fabric.
- the press fabric which receives water very well is advantageously a press felt and the press fabric which is highly permeable to water is advantageously a wire. In that connection, the web runs between two wires in the pre-press nip.
- the dry solids content of a board web is, depending on running speed, basis weight and the quality of pulp, generally below 20 % when it enters the pre-press nip. In the pre-press nip, the dry solids content of the web rises by about 10-15 %.
- the press section in accordance with the invention is also not sensitive to variations in the quality of pulp nor to the abrasive effects of pulp. Because of the upper wire, the pulp cannot come into direct contact with the upper press felt in the pre-press nip.
- the wire loop placed on the outside of the upper press felt also reduces the rewetting of the web after the pre-press nip.
- the water bound into the upper press felt in the pre-press nip cannot be absorbed through the upper wire back into the web after the pre-press nip.
- a board web can be run whose basis weight varies in a range of about 100 to 500 g/m 2 .
- a board web having a basis weight of about 400 g/m 2 and a dry solids content of about 20 % before the pre-press nip can be run at a speed of about 600 m/min, in which case the production capacity of the press will be about 4 kg/sm.
- water is removed from the web in a press section of a board machine provided with a pre-press.
- the web to be pressed is passed as a closed draw through at least two separate press nips.
- the first press nip of the press section is a pre-press nip formed between a roll placed inside the loop of a forming wire and a roll placed outside the loop of the forming wire, which pre-press nip is an extended nip.
- the second press nip of the press section is a press nip proper which is provided with two water-receiving press felts and through which the web runs between said press felts.
- the web runs in the pre-press nip between the lower forming wire and an upper water-permeable press fabric, which water-permeable press fabric is in turn positioned against the outer surface of a water-receiving press fabric lying against the outer roll.
- Figure 1 is a schematic view of a press section of a board machine provided with one pre-press nip and with one press nip proper in accordance with the invention.
- Figure 2 is a schematic view of a variant of the press section shown in Fig. 1 in accordance with the invention.
- Figure 3 is a schematic view of a second variant of the press section shown in Fig. 1 in accordance with the invention.
- Figure 4 is a schematic view of a third variant of the press section shown in Fig. 1 in accordance with the invention.
- Fig. 1 shows a press section of a board machine provided with two separate press nips N1 and N2 in accordance with the invention.
- the first press nip is a pre-press nip N1 and the second press nip is a press nip proper N2.
- the pre-press nip N1 is formed of an upper first shoe roll 22 and of a lower first counter roll 11 provided with a hollow-faced 11a shell.
- the first counter roll 11 is located inside a forming wire loop 12 and the shoe roll 22 is located outside the forming wire loop 12.
- An upper first press felt 24 runs around the shoe roll 21 as an inner loop and an upper wire 26 runs around the shoe roll 21 as an outer loop.
- the press nip proper N2 is formed of a lower second shoe roll 31 and of an upper second counter roll 41 provided with a hollow-faced 41a shell.
- the second shoe roll 31 is located inside a lower second press felt loop 34 and the second counter roll 41 is located inside an upper third press felt loop 42.
- the structure of the shoe rolls i.e. hose rolls 21, 31 used in the press nips N1, N2 is known in itself, comprising a flexible hose shell 22, 32, inside which there is a press shoe 23, 33 which can be loaded with a hydraulic pressure medium and which provides the necessary compression pressure on a web W running through the nips N1, N2.
- the hose shell is advantageously hollow-faced 22a, 32a, but it can also be smooth-faced.
- the web W is brought into the pre-press nip N1 on the forming wire 12 over suction boxes 13 placed at the end of a forming section.
- the web W runs in the pre-press nip N1 forming an extended nip between the lower forming wire 12 and the upper wire 26.
- the upper first press felt 24 additionally runs between the upper wire 26 and the hollow-faced belt shell 22 of the first shoe roll 21. Removal of water takes place in the pre-press nip N1 in two directions, i.e. through the lower forming wire 12 into the hollow-faced 11a shell of the lower first counter roll 11 and through the upper wire 26 into the upper first press felt 25 as well as into the hollow face of the belt shell 22 of the upper first shoe roll 21.
- the angle ⁇ between the nip plane T of the pre-press nip N1 and the running direction S of the web W after the nip N1 is an acute angle, in which connection the web W follows the upper wire 26 after the pre-press nip N1.
- the adherence and sticking of the web W to the bottom surface of the upper wire 26 after the pre-press nip N1 is enhanced by means of a suction box 27 placed inside the upper first press felt loop 24.
- the web W is passed on support of the bottom surface of the upper wire 26 onwards as a straight draw and transferred at a first transfer point S1 in a suction zone 36a of a first transfer suction roll 36 onto the top surface of the lower second press felt 34 running around said transfer suction roll 36, the web W being passed on support of said top surface into the press nip proper N2.
- the figure also shows dropping jets 28, by which the web W can be detached from the upper wire 26 and run as broke into a pulper located beneath the press section.
- the web W runs between the lower second press felt 34 and the upper third press felt 42.
- removal of water in the press nip proper N2 takes place into the lower second press felt 34 and into the hollow face of the belt shell 32 of the lower second shoe roll 31 as well as into the upper third press felt 42 and into the hollow face 41 a of the upper second counter roll 41.
- the upper third press felt 42 is detached from the lower second press felt 34.
- the angle between the running direction of the web W after the press nip N2 and the nip plane is an obtuse angle, in which connection the web W follows the lower second press felt 34 as a straight draw onwards.
- the web W is transferred at a second transfer point S2 in a suction zone 51 a of a second transfer suction roll 51 onto the bottom surface of an upper drying wire 52 running around said transfer suction roll 51, on support of which bottom surface the web W is transferred further to a dryer section.
- Fig. 2 shows a variant of the embodiment shown in Fig. 1.
- An upper wire 26 and an upper first press felt 24 are separated from a lower forming wire 12 immediately after a pre-press nip N1.
- the angle ⁇ between the running direction S of the web W after the pre-press nip N1 and the nip plane T is an obtuse angle, in which connection the web W follows the lower forming wire 12 after the pre-press nip N1.
- the web W is detached from the obliquely downward run of the forming wire 12 at a pick-up point P in a suction zone 44a of a pick-up suction roll 44 and caused to adhere to the outer surface of an upper third press felt 42 running around the pick-up suction roll 44.
- the web W is transferred as a straight draw first some distance merely on support of the bottom surface of the upper third press felt 42 and after that between a lower second press felt 34 and the upper third press felt 42 into a press nip N2 proper.
- the embodiment shown in Fig. 2 corresponds to the embodiment shown in Fig. 1.
- Fig. 3 shows a second variant of the embodiment shown in Fig. 1.
- This embodiment differs from the embodiment of Fig. 2 in respect of the structure of the pre-press nip N1 and the press nip proper N2.
- the pre-press nip N1 is formed of a lower first shoe roll 21 provided with a hollow-faced 22a belt shell 22 and of an upper first counter roll 11 provided with a smooth-faced shell.
- the first shoe roll 21 is now located inside a forming wire loop 12 and the first counter roll 11 is located outside the forming wire loop 12.
- An upper first press felt 24 runs around the first counter roll 11 as an inner loop and an upper wire 26 runs around it as an outer loop.
- the press nip proper N2 is formed of a lower second shoe roll 31 provided with a smooth-faced belt shell 32 and of an upper second counter roll 41 provided with a smooth-faced shell.
- this embodiment corresponds to the embodiment shown in Fig. 2.
- Fig. 4 shows a third variant of the embodiment shown in Fig. 1. This embodiment differs from the embodiment of Fig. 3 in respect of the pre-press nip.
- the pre-press nip N1 is formed of a lower hollow-faced 11a first counter roll 11 and of an upper first shoe roll 21 provided with a smooth-faced belt shell 22.
- the nip plane of the pre-press nip N1 forms here an angle of about 90° to the running direction of the web W after the pre-press nip N1.
- the travel of the web through the press section is very linear in particular in the embodiment shown in Fig. 1, in which connection the web is not subjected to high dynamic forces caused by changes in the running direction.
- the web thus adheres very well to the surface which supports it, such as a wire or a press felt.
- the press section in accordance with the invention may include one or more press nips after the second press nip N2. If, for example, the basis weight of the web W to be formed is high, a third press nip can be used to raise the dry solids content of the web W before the web W is transferred to the dryer section.
- the shoe roll 31 is always the lower roll of the press nip proper N2, but the shoe roll 31 may also function as the upper roll of the press nip proper N2, in which case the lower roll of the press nip N2 is a counter roll.
- the maximal linear load used in the pre-press nip N1 in accordance with the invention depends on the structure of the counter roll 21 and of the wires 12, 26. Linear loads of at least the order of about 600 kN/m are possible. In the press nip proper N2 it is possible to use linear loads of at least the order of 1500 kN/m.
- the degree of openness of the hollow face 22a, 32a of the belt shell 22, 32 of the shoe rolls 21, 31 is in a range of 15 to 35 %, advantageously 25 %, and the degree of openness of the hollow face 11 a, 41a of the counter rolls 11, 41 is in a range of 40 to 70 %, advantageously 60 %.
- the wire 26 or an equivalent press fabric serving as the outer upper fabric in the pre-press nip N1 shall be a thin fabric which is highly permeable to water but rigid enough to function.
- the press felt 24 or an equivalent press fabric serving as the inner upper fabric in the pre-press nip N1 shall in turn be a fabric which receives water very well, which has enough space for water and whose weight is over 2000 g/m 2 .
Landscapes
- Paper (AREA)
- Making Paper Articles (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20002428 | 2000-11-06 | ||
FI20002428A FI115307B (fi) | 2000-11-06 | 2000-11-06 | Esipuristimella varustettu kartonkikoneen puristinosa |
PCT/FI2001/000960 WO2002036878A1 (en) | 2000-11-06 | 2001-11-02 | Press section of a board machine provided with a pre-press and method for removing water from a web in such a press section |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1334231A1 EP1334231A1 (en) | 2003-08-13 |
EP1334231B1 true EP1334231B1 (en) | 2006-05-03 |
Family
ID=8559437
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01982503A Expired - Lifetime EP1334231B1 (en) | 2000-11-06 | 2001-11-02 | Press section of a board machine provided with a pre-press and method for removing water from a web in such a press section |
Country Status (7)
Country | Link |
---|---|
US (1) | US20040055723A1 (fi) |
EP (1) | EP1334231B1 (fi) |
AT (1) | ATE325228T1 (fi) |
AU (1) | AU2002214065A1 (fi) |
DE (1) | DE60119366T2 (fi) |
FI (1) | FI115307B (fi) |
WO (1) | WO2002036878A1 (fi) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10226825A1 (de) * | 2002-06-15 | 2003-12-24 | Voith Paper Patent Gmbh | Pressanordnung |
FI116400B (fi) * | 2002-11-19 | 2005-11-15 | Metso Paper Inc | Paperi- tai kartonkikoneen puristinosa |
FI20085668L (fi) * | 2008-06-27 | 2009-12-28 | Metso Paper Inc | Selluloosan kuivauskone ja menetelmä massarainan kuivaamiseksi |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI98844C (fi) * | 1991-12-23 | 1997-08-25 | Valmet Paper Machinery Inc | Paperikoneen puristinosa, etenkin painopaperilaaduille |
FI93237C (fi) * | 1993-06-11 | 1995-03-10 | Valmet Tampella Inc | Menetelmä ja laite paperi- tai kartonkikoneessa veden poistamiseksi rainasta |
FI98843C (fi) * | 1995-10-03 | 1997-08-25 | Valmet Corp | Menetelmä ja laite veden poistamiseksi paperi- tai kartonkiradasta puristamalla |
DE19654200A1 (de) * | 1996-12-23 | 1998-06-25 | Voith Sulzer Papiermasch Gmbh | Naßpresse |
EP0870866B1 (de) * | 1996-12-23 | 2003-05-07 | Voith Paper Patent GmbH | Vorrichtung und Verfahren zur Entwässerung einer Materialbahn |
-
2000
- 2000-11-06 FI FI20002428A patent/FI115307B/fi not_active IP Right Cessation
-
2001
- 2001-11-02 DE DE60119366T patent/DE60119366T2/de not_active Expired - Lifetime
- 2001-11-02 US US10/415,265 patent/US20040055723A1/en not_active Abandoned
- 2001-11-02 EP EP01982503A patent/EP1334231B1/en not_active Expired - Lifetime
- 2001-11-02 WO PCT/FI2001/000960 patent/WO2002036878A1/en active IP Right Grant
- 2001-11-02 AU AU2002214065A patent/AU2002214065A1/en not_active Abandoned
- 2001-11-02 AT AT01982503T patent/ATE325228T1/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE60119366D1 (de) | 2006-06-08 |
AU2002214065A1 (en) | 2002-05-15 |
FI115307B (fi) | 2005-04-15 |
FI20002428A (fi) | 2002-05-07 |
EP1334231A1 (en) | 2003-08-13 |
FI20002428A0 (fi) | 2000-11-06 |
WO2002036878A1 (en) | 2002-05-10 |
US20040055723A1 (en) | 2004-03-25 |
ATE325228T1 (de) | 2006-06-15 |
DE60119366T2 (de) | 2007-03-15 |
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