EP3833816A1 - Pressing arrangement - Google Patents
Pressing arrangementInfo
- Publication number
- EP3833816A1 EP3833816A1 EP19748821.6A EP19748821A EP3833816A1 EP 3833816 A1 EP3833816 A1 EP 3833816A1 EP 19748821 A EP19748821 A EP 19748821A EP 3833816 A1 EP3833816 A1 EP 3833816A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- press
- web
- arrangement according
- extended
- nip
- 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.)
- Pending
Links
- 239000011111 cardboard Substances 0.000 claims abstract description 4
- 239000011087 paperboard Substances 0.000 claims abstract description 4
- 230000015572 biosynthetic process Effects 0.000 claims abstract 2
- 230000003993 interaction Effects 0.000 claims abstract 2
- 238000001035 drying Methods 0.000 claims description 22
- 238000004140 cleaning Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 5
- 239000004744 fabric Substances 0.000 claims description 3
- 238000010025 steaming Methods 0.000 claims 1
- 239000012535 impurity Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000011109 contamination Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/32—Washing wire-cloths or felts
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
- D21F5/04—Drying on cylinders on two or more drying cylinders
- D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
- D21F7/04—Paper-break control devices
Definitions
- the invention relates to a press arrangement for dewatering a paper or cardboard web with a basis weight between 60 and 250 g / m 2 and at a machine speed of up to 1800 m / min consisting of four press rolls to form three press nips, through which the web together with at least one endless, water-absorbing drainage belt runs.
- the fibrous webs produced therefrom lead to greater contamination of the elements coming into contact with them, in particular if these elements have a relatively high adhesion, in particular a smooth surface.
- the press nips often have two separate drainage belts, so that the fibrous web can be safely guided between the two.
- this is also associated with high costs and high rewetting of the fibrous web after the press nips.
- the problem here is the transfer of the fibrous web by means of an open train, particularly at high machine speeds, and the complex transfer.
- the object of the invention is therefore to enable high dry contents with reliable web guidance and the lowest possible costs.
- the fibrous web 1 is transferred from a former 19 of a former former to a water-absorbing, upper dewatering belt 7 of the press arrangement.
- This dewatering belt 7 then guides the web 1 together with a water-absorbing dewatering belt 6 running under the web 1 through a first press nip of the press arrangement.
- This press nip is elongated and for this purpose is formed by a lower shoe press roll 2 and an upper, vacuumed press roll 3.
- Shoe press rolls 2, 5 have a flexible roll shell, which is pressed by a press shoe with a concave pressing surface to form an extended press nip to the cylindrical counter-press roll 3, 4. Because of the longer dwell time of web 1 in the press nip, they enable intensive, yet gentle drainage.
- the web in the first press nip has a relatively high moisture content, it is sufficient to protect the volume if the shoe length of the corresponding shoe press roll 2 is less than 270 mm, preferably less than 220 mm and in particular less than 140 mm.
- the line load in the first press nip should be greater than 100 kN / m, preferably greater than 150 kN / m and in particular greater than 175 kN / m.
- the shoe press roll 2 of the first press nip has several, preferably three, separately controllable pressure zones which are arranged next to one another transversely to the web running direction 20.
- the vacuumed press roll 3 like the suction guide rolls 10 wrapped in an air-permeable drainage belt 6, 7, 9 of the press arrangement, has a perforated roll jacket, the interior of which is at least partially connected to a vacuum source.
- the cylindrical, vacuumed press roll 3 of the first extended press nip should have a jacket thickness of at least 40 mm.
- the suppression not only supports the removal of the water pressed out of the web 1, but also the adhesion of the web 1 to the corresponding dewatering belt 7, so that the lower dewatering belt 6 can be easily removed from the web 1 after the first press nip.
- the web 1 runs together with the upper dewatering belt 7 through a second press nip of the press arrangement, which is formed by the vacuumed press roll 3 and a further cylindrical press roll 4 with a smooth outer surface.
- the web 1 is guided alone on the smooth outer surface of the press roller 4 to a third press nip, which is also elongated and for this purpose by the further, cylindrical press roller 4 and a further shoe arranged above the web 1 and wrapped by a water-absorbing dewatering band 9 -Press roll 5 is formed. Since the moisture content in the first, extended press nip is significantly larger than in the second, extended press nip, it is sufficient to protect the web volume if the first extended press nip is at most as long as the second extended press nip and / or the line load in the first extended press nip is at most as large as in the second extended press nip.
- the web 1 can be subjected to hot steam within the press arrangement via one or more steam blow boxes 11.
- the areas between the first and the second and between the second and the third press nip are particularly suitable for this.
- the web guidance in the area of the extended press nips can be improved by the web 1 wrapping the corresponding cylindrical press roll 3, 4 before and after each extended press nip with at least 20 mm.
- the water-absorbing drainage belts 6, 7, 9 are designed as press felts.
- the upper dewatering belt 9 is moved away from the web 1 after the third press nip and the web 1 is continued solely on the jacket of the smooth cylindrical press roll 4 until it is transferred to a drying wire 12 of a subsequent drying unit for drying the web 1.
- the cylindrical press roll 4 of the second extended press nip is wrapped in an endlessly circulating, semi-permeable or an impermeable and smooth transfer belt 8, which accordingly runs below and together with the web 1 through the second and third press nips.
- the web 1 is then transferred from the transfer belt 8 to the dryer fabric 12 of the following drying unit without a free pull.
- the cylindrical press roll 4 according to FIG. 1 and the transfer belt 8 according to FIG. 2 are so smooth that there is sufficient adhesion of the web 1 to the press roll 4 or to the transfer belt 8 and the dewatering belt 9 after the third Press nip can be guided away from web 1.
- this liability is reinforced by a short wrapping of the lower press roll 4 by the upper dewatering belt 9.
- the suction guide roller 21 should have a plurality of separate suction zones, the vacuum of a suction zone being at least 20 kPa, preferably at least 25 kPa and in particular at least 30 kPa in order to implement a high vacuum zone.
- the web 1 is supported by the drying wire 12, alternately guided in a meandering manner over heated drying cylinders 15 and suction guide rolls 16.
- a removal scraper 17 and possibly also a following cleaning scraper are assigned to the first drying cylinder 15 of the following drying group.
- the take-off scraper 17 separates the web 1 when it is transferred from the drying cylinder 15 and then guides it into a pulper 18 located below and between the first drying cylinder 15 and the following guide roller 16.
- the axis of the first drying cylinder 15 with the removal scraper 17 and the axis of the following suction-guided guide roller 16 are vertically offset from one another.
- these axes have a horizontal distance from one another which is greater than 80%, preferably greater than 90% and in particular greater than 95% of the sum of the radii of this drying cylinder 15 and this guide roller 16.
- the transfer belt 8 is assigned a cleaning unit 13 for the fluid application of the transfer belt 8 and at least one scraper 14 after delivery of the web 1.
- This cleaning device 13 directs a cleaning fluid, here water with a pressure of at least 50, in particular at least 100 and preferably at least 120 bar, onto the web-leading side of the transfer belt 8.
- the fluid is applied via at least one, preferably at least two, preferably obliquely and advantageously in the opposite direction rows of nozzles inclined to the belt surface.
- nozzles with a small opening diameter of less than 0.9, preferably less than 0.7 and in particular at most 0.5 mm are used.
- the loosened impurities are removed from the transfer belt 8 by the following scraper 14.
- the transfer belt 8 is supported in the area of the cleaning device 13 and the scraper 14 on at least one guide roller.
Landscapes
- Paper (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018119381.5A DE102018119381A1 (en) | 2018-08-09 | 2018-08-09 | Press arrangement |
PCT/EP2019/070687 WO2020030509A1 (en) | 2018-08-09 | 2019-07-31 | Pressing arrangement |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3833816A1 true EP3833816A1 (en) | 2021-06-16 |
Family
ID=67514655
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19748821.6A Pending EP3833816A1 (en) | 2018-08-09 | 2019-07-31 | Pressing arrangement |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3833816A1 (en) |
CN (1) | CN112424421A (en) |
DE (1) | DE102018119381A1 (en) |
WO (1) | WO2020030509A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116219789A (en) * | 2023-03-29 | 2023-06-06 | 广东理文造纸有限公司 | Paper web extrusion dewatering device for papermaking |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI89085C (en) * | 1987-01-23 | 1993-08-10 | Valmet Paperikoneet Oy | Regulating procedure for a paper machine press section |
FI955014A (en) * | 1995-10-20 | 1997-04-21 | Valmet Corp | Press section in a paper machine, where a long press is used |
DE19702575A1 (en) * | 1997-01-24 | 1998-07-30 | Voith Sulzer Papiermasch Gmbh | Machine for the production of a fibrous web |
DE19744341A1 (en) * | 1997-10-07 | 1999-04-15 | Voith Sulzer Papiertech Patent | Paper machine |
DE19912497A1 (en) * | 1999-03-19 | 2000-09-21 | Voith Sulzer Papiertech Patent | Press section for a wet paper or cardboard web has a swing frame and secondary levers for a compact combination press structure which can be opened for a blanket or roller change |
FI116401B (en) * | 2000-02-22 | 2005-11-15 | Metso Paper Inc | Paper or paperboard machine with forming unit and press section |
DE102005031203A1 (en) * | 2005-07-01 | 2007-01-25 | Voith Patent Gmbh | paper machine |
DE102005036903A1 (en) * | 2005-08-05 | 2007-02-08 | Voith Patent Gmbh | Drying press for wet carton, paper or tissue paper web has three drying cylinders each succeeded by a stabilising suction box |
DE102005039300A1 (en) * | 2005-08-19 | 2007-02-22 | Voith Patent Gmbh | Method for operating a press arrangement |
DE102007021879A1 (en) * | 2007-05-10 | 2008-11-13 | Voith Patent Gmbh | Pressing arrangement for e.g. paper web producing machine, has transfer band for transferring fibrous web between pressing nips, where band is formed by transfer filter band with permeability in range of preset cubic feet per minute |
DE102007024508A1 (en) * | 2007-05-25 | 2008-11-27 | Voith Patent Gmbh | Schuhsaugpresswalze |
DE102011004565A1 (en) * | 2011-02-23 | 2012-08-23 | Voith Patent Gmbh | Press section of a machine for producing a fibrous web |
DE102016209780A1 (en) * | 2016-06-03 | 2017-12-07 | Voith Patent Gmbh | press section |
-
2018
- 2018-08-09 DE DE102018119381.5A patent/DE102018119381A1/en active Pending
-
2019
- 2019-07-31 EP EP19748821.6A patent/EP3833816A1/en active Pending
- 2019-07-31 WO PCT/EP2019/070687 patent/WO2020030509A1/en unknown
- 2019-07-31 CN CN201980046944.3A patent/CN112424421A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2020030509A1 (en) | 2020-02-13 |
DE102018119381A1 (en) | 2020-02-13 |
CN112424421A (en) | 2021-02-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1072721B1 (en) | Paper machine | |
DE2753201A1 (en) | PROCESS FOR THE TREATMENT OF A PAPER WEB IN THE WET SECTION OF A PAPER MACHINE | |
WO2021219272A1 (en) | Machine for producing or treating a fibrous web | |
EP4352297A1 (en) | Machine for producing or treating a fibrous web | |
EP3464716B1 (en) | Machine for dewatering and drying a fibrous web | |
EP1072722B1 (en) | Dryer section | |
WO2020035318A1 (en) | Paper machine and method for producing a paper or paperboard web | |
EP3548664B1 (en) | Pressing arrangement | |
EP1647628A1 (en) | Press section | |
EP1156155B1 (en) | Dryer section of a machine for manufacturing a paper or board web | |
EP3833816A1 (en) | Pressing arrangement | |
DE102019116602A1 (en) | MACHINE FOR THE MANUFACTURE OF A FIBER WEB | |
AT521367B1 (en) | DEVICE AND METHOD FOR CONVERTING A STRIP OF A TRAIN | |
EP1777342B1 (en) | Pressing arrangement | |
EP1116823B1 (en) | Dryer section | |
AT521368B1 (en) | DEVICE AND METHOD FOR CONVERTING A STRIP OF A TRAIN | |
DE10016492A1 (en) | Laxative | |
DE102020131965A1 (en) | paper machine | |
EP1777340A1 (en) | Pressing arrangement | |
DE102005048928A1 (en) | Press for dewatering and smoothing a paper web comprises an extended press nip and a calender nip between which the web runs with no open draw | |
DE29924879U1 (en) | Drying section for e.g. paper web has transfer point where components are slightly spaced apart and run at differing speeds | |
DE19724218A1 (en) | Paper=making machine press section | |
DE10213144A1 (en) | Press arrangement | |
DE102011082346A1 (en) | Method for manufacturing fibrous material web i.e. paper web, involves allowing fibrous material web with press felt to come in contact with smooth surface of backing roll or with press felt, where smooth transfer tape loops backing roll | |
DE102011006634A1 (en) | Paper machine for producing e.g. paper web, has drying belt pressing web against heated sleeve surface of cylinder, where web unsupportedly runs from cylinder till transfer through another drying belt after guiding away of former belt |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20210309 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: GRANT OF PATENT IS INTENDED |
|
INTG | Intention to grant announced |
Effective date: 20240409 |
|
GRAJ | Information related to disapproval of communication of intention to grant by the applicant or resumption of examination proceedings by the epo deleted |
Free format text: ORIGINAL CODE: EPIDOSDIGR1 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |