EP1777342A1 - Agencement de presse - Google Patents
Agencement de presse Download PDFInfo
- Publication number
- EP1777342A1 EP1777342A1 EP06121951A EP06121951A EP1777342A1 EP 1777342 A1 EP1777342 A1 EP 1777342A1 EP 06121951 A EP06121951 A EP 06121951A EP 06121951 A EP06121951 A EP 06121951A EP 1777342 A1 EP1777342 A1 EP 1777342A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- press
- arrangement according
- smoothing
- fibrous web
- belt
- 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.)
- Granted
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 pressing arrangement for dewatering a paper, cardboard or other fibrous web in a machine for producing and / or finishing the same with at least one smoothing press nip through which the fibrous web runs together with a water-absorbing, air-permeable press belt and its on the the press belt opposite side of the fibrous web arranged pressing surface is smooth.
- Press arrangements consist of one or more press nips, through which the fibrous web is guided together with water-absorbing press felts.
- press felts have a relatively rough contact surface, resulting in a relatively high roughness of the fibrous web.
- the surface of the fibrous web can also be influenced relatively easily.
- the object of the invention is therefore to improve the web guide in such smoothing press nips with the least possible effort.
- this object is achieved in that the pressing surface opposite the smooth pressing surface is formed by a suction press roll.
- the negative pressure of the suction press roll acts on the fibrous web through the press belt and sucks it to the press belt.
- This one-sided smoothness production may be sufficient for certain products.
- a two-sidedness of the fibrous web in particular with regard to gloss and smoothness, forms in the press arrangement.
- the rougher side of the fibrous web can be smoothed with the smooth pressing surface in a simple manner.
- the smooth pressing surface can be formed by a smoothing belt, which is preferably pressed by a pressing element to the suction-pressure roller.
- the smooth pressing surface is formed by a smooth cylindrical smoothing roll.
- the smoothing roller has a coating, preferably of ceramic.
- the continuation of the fibrous web on the press belt can be facilitated even after the smoothing press nip in that the diameter of the smoothing roll is smaller than or equal to the diameter of the suction press roll.
- the press belt should be as smooth as possible and preferably fibers with at most 11 dtex or a coating of polymers or an increased number of hot melt adhesive fibers on the contact side Have fibrous web.
- the suction region of the suction press roll should extend at least over the wrap area of the press belt, preferably at least slightly beyond it.
- the suction press roll should have several, preferably in the web running direction one behind the other lying suction zones.
- the suction press roll in the region of the smoothing press nip has a high vacuum zone, which preferably also extends in the web running direction beyond, preferably up to 60 mm beyond the smoothing press nip addition.
- the vacuum in the high vacuum zone should be between 10 and 60 kPa.
- the strength of the negative pressure and the extent beyond the smoothing press gap ensure the continuation of the fibrous web on the press belt after the smoothing press nip despite the strong adhesion of the fibrous web to the smooth pressing surface.
- the negative pressure in the suction region of the suction press roll outside the high vacuum zone is below 30 kPa.
- the press belt should preferably take over the fibrous web during the wrapping of the suction press roll from a transfer belt of an upstream unit.
- the closed guidance of the fibrous web i. the support of this at least one band or a roller o. ⁇ . leads to a secure web guide and allows high machine speeds.
- the transfer belt is designed as air-permeable and water-absorbing dewatering belt, which preferably wraps around a press roll of an upstream press nip or if the transfer belt takes over the fibrous web of a smooth transfer belt which preferably wraps around a press roll of an upstream press nip.
- the transfer belt In order to support the takeover of the fibrous web from the transfer belt, the transfer belt should be permeable to air and wrap around a preferably evacuated guide roller during the acquisition of the fibrous web from the transfer belt.
- the upstream unit is preferably formed by one or more press nips for dewatering the fibrous web.
- this should have a maximum hardness of 80, preferably a maximum of 50 P & J.
- the transfer ribbon has a roughness Rz between 5 and 50 microns.
- the suction press roll should preferably be driven speed controlled.
- the smoothing roller should also be driven. With the smoothing roller, the drive should be torque-controlled in normal operation. However, to facilitate or enable the transfer of the fibrous web, it is advantageous if the smoothing press nip is opened during the transfer of the fibrous web and the smoothing roll is preferably driven in a speed-controlled manner.
- the transfer belt wraps around an evacuated guide roll, as in the case of removal from the transfer belt, it is advantageous if the guide roll of the transfer belt is preferably speed-controlled in order to enable it to move with the suction press roll.
- a blowing device should be located in the opening gusset after the third smoothing press nip, which in particular directs blowing air between the smoothing roll and the fibrous web when transferring.
- the suction press roll in the area of takeover of the fibrous web from the transfer belt should have a transfer zone whose negative pressure may preferably be below 30 kPa.
- the negative pressure is preferably less than 20 kPa.
- a post zone should follow the high vacuum zone in the web running direction. This post-zone can absorb thrown off the press belt after its removal from the suction press roll thrown off water.
- a water collecting device preferably in the form of a gutter, in the opening gusset between the suction press roll and the press belt.
- the smoothing press nip should be preceded by at least one extended press nip.
- the fibrous web should be guided through the extended press nip with water-absorbing drainage tape on both sides.
- two or three press nips upstream of the smoothing press nip are sufficient.
- At least one of the upstream press nips should have a smooth pressing surface on the side of the fibrous web opposite the smooth press surface of the smoothing press nip.
- the smooth pressing surface of the upstream press nip is formed by the transfer belt or by a smooth press roll of an upstream press roll.
- the fibrous web 1 is transferred from a forming wire 2 of a former upstream of the press arrangement for sheet formation of the paper machine to an upper, water-absorbing dewatering belt 3 of a first press nip of the press arrangement. This transfer is supported by a looped by the dewatering belt 3, suctioned guide roll.
- This dewatering belt 3 leads the fibrous web 1 together with a lower water-absorbing dewatering belt 4 through the first press nip.
- the fibrous web 1 is still passed together via a transfer line from both dewatering belts 3,4, before the upper dewatering belt 3 is led away from the fibrous web 1.
- the lower dewatering belt 4 then transfers the fibrous web 1 to an upper, water-absorbing dewatering belt 5 of a second press nip. Through this second press nip, the fibrous web 1 runs together with a lower smooth transfer belt. 6
- Both press gaps are elongated and are formed by an upper shoe press roll 11,13 and a lower cylindrical counter roll 10,12.
- the shoe press rollers 11,13 have a flexible roll shell, the one of Pressing element with concave pressing surface to the respective counter-roller 10,12 is pressed.
- the resulting, extended press nip allows for gentle, yet intensive dewatering.
- the upper dewatering belt 5 is led away from the fibrous web 1. This is not a problem since the fibrous web 1 adheres much more to the smooth transfer belt 6 than to the opposite dewatering belt 5.
- the fibrous web 1 is transferred following an air-permeable transfer belt 7 in the form of a low-mark drying wire.
- This transfer is supported by a, coiled by the transfer belt 7 and sucked guide roller 14 by the negative pressure of this guide roller 14 sucks the fibrous web 1 to the transfer belt 7.
- This transfer belt 7 leads the fibrous web 1 to another, lower, water-absorbing press belt 8 in the form of a press felt of a third press nip.
- This smoothing press nip is formed by a suction press roll 16 looped by the press belt 8 and an upper smoothing roll 15. In this case, the transfer of the fibrous web 1 takes place while the press belt 8 wraps around the suction press roll 16.
- the press belt 8 transfers the fibrous web 1 to an air-permeable belt 9 in the form of a drying wire of a following drying group of a dryer section of the machine, which is supported by a guide roller 17, which is looped around by the drying wire.
- the fibrous web 1 is guided for drying over heated drying cylinders 18, wherein the drying wire presses the fibrous web 1 against its lateral surface.
- the fibrous web 1 is constantly supported by a belt within the press assembly, so that the web guide becomes much more stable and secure, allowing much higher machine speeds.
- the drainage bands 3, 4, 5, 7 of the press arrangement are not only water absorbent, but also permeable to air and designed as press felt.
- the air permeability allows the support of the railway transfer by suctioned guide roller 14th
- the transfer belt 6 should have not only a smooth contact surface with respect to the fibrous web 1, but also a hardness of about 50 P & J. This ensures a sufficient load capacity.
- the roughness Rz of the transfer belt 6 should be between 5 and 50 micrometers.
- the press belt 8 of the smoothing press nip should not only be water-absorbent and permeable to air, but also should be as smooth as possible. This supports the smoothing of the fibrous web 1 in the smoothing press nip and increases the adhesion of the fibrous web 1 to the press belt 8.
- the press belt should have 8 fibers with at most 11 dtex or a coating with polymers or an increased number of hot melt adhesive fibers on the contact side to the fibrous web 1.
- a blowing device 20 which directs in particular during transfer blowing air between the smoothing roll 15 and the fibrous web 1.
- This smoothing roll 15 is provided to ensure sufficient smoothness with a ceramic coating.
- the suction press roll 16 has a plurality of suction zones 21, 22, 23, 24 arranged one behind the other in the web running direction 19.
- All other suction zones 22, 23, 24 have a negative pressure of less than 30 kPa.
- the holding zone 22 is intended only to guide the fibrous web 1 safely to the press nip.
- a post-zone 24 adjoins, which is intended to suck in the water thrown off this after the removal of the dewatering belt 8.
- a Wasserrrine 25 between the suction-pressure roller 16 and the expiring press belt. 8
- the smoothing roll 15 is lifted and driven speed-controlled during this time. This facilitates the subsequent closing of the press nip with the also speed-controlled driven suction press roller 16th
- this guide roller 14 is driven speed controlled.
- This press arrangement not only reduces the two-sidedness of the fibrous web 1 but also enables higher dry contents to be achieved at very high machine speeds.
- This first press nip of the press arrangement is formed by an upper shoe press roll 11 and a cylindrical counter roll 10. Both press rolls 10, 11 each have a water-absorbing drainage band 3, 4.
- the lower dewatering belt 4 transfers the fibrous web 1 to the transfer belt 7 after the extended press nip and the removal of the upper dewatering belt 3. From this, the fibrous web 1 reaches the press belt 8 of the smoothing press nip.
- the first press nip of the press assembly is formed by an upper suction press roll 26 and a lower shoe press roll 27. Also, both press rolls have their own water-absorbing drainage tape 28,29.
- the upper dewatering belt 28 takes over the fibrous web 1 not only from the forming wire 2, it also leads the fibrous web 1 after the extended press nip by a second press nip.
- This second press nip is formed by a cylindrical press roll 12, which is looped by a smooth transfer belt 6, and the suction press roll 26.
- the negative pressure of the suction press roller 26 not only supports the removal of water in the first press nip but also the adhesion of the fibrous web 1 to the upper dewatering belt 28 up to the second press nip.
- the fibrous web 1 runs together with the transfer belt 6 up to a third press nip because of the greater adhesion.
- This third press nip is formed by a shoe press roll 13 and the press roll 12 wrapped by a water-absorbing dewatering belt 5. This means that this press roller 12 is involved in the formation of two press nips, which makes the arrangement very compact.
- the transfer belt 6 then guides the fibrous web 1 until it is transferred to the transfer belt 7. From there it reaches the press belt 8 and through the smoothing press nip.
- the contact with the transfer belt 6 and the smoothing roller 15 results in an increased smoothness on both sides of the fibrous web 2. Furthermore, the multiplicity of press nips leads to a very high dewatering performance of the press arrangement.
Landscapes
- Paper (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200510050281 DE102005050281A1 (de) | 2005-10-20 | 2005-10-20 | Pressanordnung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1777342A1 true EP1777342A1 (fr) | 2007-04-25 |
| EP1777342B1 EP1777342B1 (fr) | 2014-03-19 |
Family
ID=37499418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20060121951 Not-in-force EP1777342B1 (fr) | 2005-10-20 | 2006-10-09 | Agencement de presse |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1777342B1 (fr) |
| DE (1) | DE102005050281A1 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009092477A1 (fr) * | 2008-01-25 | 2009-07-30 | Voith Patent Gmbh | Dispositif de fabrication et/ou de traitement d’une bande de matière fibreuse |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009047470A1 (de) * | 2009-12-03 | 2011-06-09 | Voith Patent Gmbh | Vorrichtung zur Behandlung einer laufenden Papier-, Karton- oder anderen Faserstoffbahn |
| DE102016209780A1 (de) * | 2016-06-03 | 2017-12-07 | Voith Patent Gmbh | Pressenpartie |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB458758A (en) * | 1935-06-21 | 1936-12-21 | William Hulse Millspaugh | Improvements in or relating to paper making machines |
| DE684680C (de) * | 1935-06-21 | 1939-12-02 | William Hulse Millspaugh | Langsiebpapiermaschine |
| US2959222A (en) * | 1957-06-05 | 1960-11-08 | Beloit Iron Works | Pickup and press section |
| WO1982001203A1 (fr) * | 1980-09-25 | 1982-04-15 | Oy Valmet | Procede dans la section de presse d'une machine a papier |
| US4483745A (en) * | 1982-09-29 | 1984-11-20 | Beloit Corporation | Method and apparatus of sheet transfer using a nonporous smooth surfaced belt |
| EP0576115A1 (fr) * | 1992-06-11 | 1993-12-29 | Albany International Corp. | Bande de transfert |
| DE10137527A1 (de) * | 2001-08-01 | 2003-02-13 | Voith Paper Patent Gmbh | Pressenanordnung |
| EP1316641A1 (fr) * | 2001-12-01 | 2003-06-04 | Voith Paper Patent GmbH | Section de pressage |
| EP1375740A1 (fr) * | 2002-06-15 | 2004-01-02 | Voith Paper Patent GmbH | Dispositif de pressage |
| WO2004046459A1 (fr) * | 2002-11-19 | 2004-06-03 | Metso Paper, Inc. | Section de presse dans une machine a papier ou a carton |
| US20050124248A1 (en) * | 2002-04-26 | 2005-06-09 | Tamfelt Oyj Abp | Press felt |
-
2005
- 2005-10-20 DE DE200510050281 patent/DE102005050281A1/de not_active Withdrawn
-
2006
- 2006-10-09 EP EP20060121951 patent/EP1777342B1/fr not_active Not-in-force
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB458758A (en) * | 1935-06-21 | 1936-12-21 | William Hulse Millspaugh | Improvements in or relating to paper making machines |
| DE684680C (de) * | 1935-06-21 | 1939-12-02 | William Hulse Millspaugh | Langsiebpapiermaschine |
| US2959222A (en) * | 1957-06-05 | 1960-11-08 | Beloit Iron Works | Pickup and press section |
| WO1982001203A1 (fr) * | 1980-09-25 | 1982-04-15 | Oy Valmet | Procede dans la section de presse d'une machine a papier |
| US4483745A (en) * | 1982-09-29 | 1984-11-20 | Beloit Corporation | Method and apparatus of sheet transfer using a nonporous smooth surfaced belt |
| EP0576115A1 (fr) * | 1992-06-11 | 1993-12-29 | Albany International Corp. | Bande de transfert |
| DE10137527A1 (de) * | 2001-08-01 | 2003-02-13 | Voith Paper Patent Gmbh | Pressenanordnung |
| EP1316641A1 (fr) * | 2001-12-01 | 2003-06-04 | Voith Paper Patent GmbH | Section de pressage |
| US20050124248A1 (en) * | 2002-04-26 | 2005-06-09 | Tamfelt Oyj Abp | Press felt |
| EP1375740A1 (fr) * | 2002-06-15 | 2004-01-02 | Voith Paper Patent GmbH | Dispositif de pressage |
| WO2004046459A1 (fr) * | 2002-11-19 | 2004-06-03 | Metso Paper, Inc. | Section de presse dans une machine a papier ou a carton |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009092477A1 (fr) * | 2008-01-25 | 2009-07-30 | Voith Patent Gmbh | Dispositif de fabrication et/ou de traitement d’une bande de matière fibreuse |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102005050281A1 (de) | 2007-04-26 |
| EP1777342B1 (fr) | 2014-03-19 |
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