EP3837394A1 - Paper machine and method for producing a paper or paperboard web - Google Patents
Paper machine and method for producing a paper or paperboard webInfo
- Publication number
- EP3837394A1 EP3837394A1 EP19749318.2A EP19749318A EP3837394A1 EP 3837394 A1 EP3837394 A1 EP 3837394A1 EP 19749318 A EP19749318 A EP 19749318A EP 3837394 A1 EP3837394 A1 EP 3837394A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- web
- press
- paper machine
- drying
- press 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
- 239000000123 paper Substances 0.000 title claims abstract description 26
- 239000011087 paperboard Substances 0.000 title claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 238000001035 drying Methods 0.000 claims abstract description 35
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 3
- 239000004744 fabric Substances 0.000 claims description 18
- 239000000945 filler Substances 0.000 claims description 11
- 238000007664 blowing Methods 0.000 claims description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000011111 cardboard Substances 0.000 claims description 6
- 238000005524 ceramic coating Methods 0.000 claims description 3
- 239000004408 titanium dioxide Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 230000001629 suppression Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000003825 pressing Methods 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
- D21F9/00—Complete machines for making continuous webs of paper
- D21F9/02—Complete machines for making continuous webs of paper of the Fourdrinier type
-
- 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
- D21F1/44—Watermarking devices
- D21F1/46—Dandy rolls
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
-
- 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
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
- D21F5/021—Construction of the cylinders
-
- 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
- D21F7/006—Cutting the edges of the paper-web
Definitions
- the invention relates to a paper machine for producing a paper or cardboard web comprising a headbox, a former for sheet formation, a press section for dewatering and a drying section for drying the web, the web being guided through at least two press nips within the press section, together with on both sides runs an endlessly circulating, water-absorbing drainage belt through the first press nip and together with only one drainage belt through the last press nip.
- the invention also relates to a method for producing a paper or cardboard web which has a filler content between 20 and 42%, in particular with a machine according to the invention.
- the object of the invention is therefore to enable safe operation even at high machine speeds.
- the object with regard to the paper machine was achieved in that, after the first press nip, its lower dewatering band is guided away from the web, the opposite, upper dewatering band transfers the web to a lower dewatering band in the second and last press nip, and this second press nip is extended.
- This press section which is limited to two press nips, is associated with relatively little effort and, because of the two dewatering belts, already ensures a very high dewatering performance in the first press nip.
- the first press nip can be formed by two cylindrical press rolls or can be extended.
- the web is constantly guided by a belt or roller, which counteracts a break even at higher machine speeds.
- the extended, second press nip should advantageously be formed by a lower shoe press roll with a flexible roll jacket and a cylindrical, upper press roll. After the second press nip, the web runs along the smooth lateral surface of the upper press roller until it is transferred to an air-permeable dryer fabric in the dryer section.
- the smooth surface of the upper press roller ensures good web guidance, but also a relatively smooth surface on the top of the web.
- the web After the second press nip, the web has a dry content of at least 45%, in particular between 50 and 60%, so that a first, short free train in which the web runs unsupported can be realized.
- the dryer fabric should wrap around a guide roller that is slightly spaced from the upper press roller and vacuumed.
- the web is advantageously guided alternately in a meandering manner over heated drying cylinders and guide rollers, at least one scraper being assigned to the first drying cylinder following the press section.
- edges separated from the web can be removed from the drying cylinder.
- a pulper is arranged under and between the first drying cylinder and the following guide roller.
- a suction device should be arranged between the first drying cylinder and the following guide roller on the side of the dryer fabric facing away from the web.
- At least one blowing device is arranged, the blowing width of which is directed towards the respective web edge to adapt to the position and width of the web edge transversely to the web running direction.
- the detachment of the web edges can also be supported in that the first drying cylinder has a ceramic coating.
- the web in the former is at least essentially only dewatered downward and only together through the last press nip of the press section runs with a lower drainage belt.
- the web in the former is only dewatered downwards and, accordingly, the former has one or more water-permeable forming fabrics which are guided endlessly over guide rollers and run exclusively under the web.
- the web is always supported by one element from the former to the last press nip.
- the invention is particularly suitable for webs with a high filler content between 30 and 50%, preferably between 35 and 50% and in particular between 35 and 40% and / or a filler which is at least predominantly formed by titanium dioxide.
- Figure 1 a system diagram of a first part of a paper machine for the production of decorative paper
- Figure 2 an alternative press section thereof.
- the decorative paper has a high filler content between 20 and 42%, in particular between 35 and 40%.
- the filler is essentially or exclusively formed by titanium dioxide.
- the stock suspension is applied evenly distributed over the width of the web to the lower, endlessly circulating forming fabric 19 of the adjacent former 3.
- sheets are formed as a result of dewatering through the water-permeable forming screen 19 guided over guide rollers 18, i.e. the drainage takes place exclusively downwards.
- This drainage is promoted by means of a vacuum, which starts from the foils and suction boxes 20 present under the forming fabric 19.
- the web 1 is then transferred from the forming fabric 19 to a water-absorbing, upper dewatering belt 4 of the press section.
- This dewatering belt 4 then guides the web 1 together with a water-absorbing dewatering belt 5 running under the web 1 through a first press nip of the press section.
- this press nip is formed by a lower cylindrical press roll 22 and an upper, vacuumed press roll 23.
- the lower dewatering belt 5 is led away from the web 1, the web 1 with the upper dewatering belt 4 looping around the upper press roller 23.
- the suppression of the upper press roller 23 ensures reliable guidance on the upper drainage belt 4.
- the first press nip in FIG. 2 is formed by a lower shoe press roll 22 and an upper, cylindrical press roll 23.
- the web 1 is guided between the two drainage belts 4, 5.
- the lower dewatering band 5 is only led away from the web 1 in the looping area of a suction-guided guide roller of the upper dewatering band 4.
- the web 1 is then transferred in both cases from the upper dewatering belt 4 to a lower dewatering belt 6 of a second and last press nip of the press section.
- the takeover is supported by a suction guide roller 24 wrapped around by the lower dewatering belt 6.
- the second press nip is elongated and for this purpose is formed by a lower shoe press roll 7 and an upper, cylindrical press roll 8 with a smooth outer surface.
- Shoe press rolls 7 have a flexible roll jacket, which is pressed by a press shoe with a concave pressing surface to form an extended press nip to the cylindrical counter-press roll 8. Because of the longer dwell time of web 1 in the press nip, they enable intensive but gentle drainage.
- the water-absorbing drainage belts 4, 5, 6 are designed as endless circulating press felts.
- the vacuumed press roller 23 as well as the vacuumed guide rollers 10, 12 have a perforated roller jacket, the interior of which is at least partially connected to a vacuum source.
- the top of the web 1 at the end of the press section is smoother than the bottom. This is further supported by the fact that a low-marking upper side of the web 1 was already produced in the former 3.
- the lower dewatering belt 6 is moved away from the web 1 and the web 1 alone on the jacket of the smooth cylindrical press roller 8 until it is transferred to an air-permeable dryer fabric 9 of a subsequent dryer section for drying the web 1.
- the air-permeable dryer fabric 9 wraps around a guide roller 10 which is slightly spaced from the upper press roller 8 and is vacuumed.
- the web 1 runs with a short free train, i.e. unsupported. So that this does not lead to a significant increase in the risk of tearing, the dry content of the web 1 should be at least 45% with this first free train.
- the web 1 is supported by the dryer fabric 9, alternately guided in a meandering manner over heated drying cylinders 11 and suctioned guide rollers 12.
- a removal scraper 15 and possibly also a subsequent cleaning scraper are assigned to the first drying cylinder 11 of the drying section.
- the take-off scraper 15 separates the web 1 or its transfer strip when transferring it from the drying cylinder 11 and then guides it into a pulper 14 located below and between the first drying cylinder 11 and the following guide roller 12.
- first drying cylinder 11 can also have a ceramic coating, which facilitates the detachment of the web 1 or parts thereof.
- a suction device 13 and a blowing device 17 are arranged between the first drying cylinder 11 and the following guide roller 12 on the side of the drying wire 9 facing away from the web.
- the suppression of the suction device 13 improves the adhesion of the web 1 or a transfer strip to the dryer fabric 9.
- blowing device 17 promotes the detachment of the web 1, but in particular the transfer strip at the web edge from the dryer fabric 9.
- the suction width and the blowing width directed at the web 1 can be changed transversely to the web running direction 16.
Landscapes
- Paper (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018119686.5A DE102018119686A1 (en) | 2018-08-14 | 2018-08-14 | paper machine |
PCT/EP2019/070674 WO2020035318A1 (en) | 2018-08-14 | 2019-07-31 | Paper machine and method for producing a paper or paperboard web |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3837394A1 true EP3837394A1 (en) | 2021-06-23 |
Family
ID=67539502
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19749318.2A Pending EP3837394A1 (en) | 2018-08-14 | 2019-07-31 | Paper machine and method for producing a paper or paperboard web |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3837394A1 (en) |
CN (1) | CN112585318A (en) |
DE (1) | DE102018119686A1 (en) |
WO (1) | WO2020035318A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102020131965A1 (en) * | 2020-12-02 | 2022-06-02 | Voith Patent Gmbh | paper machine |
DE102021103519A1 (en) | 2021-02-15 | 2022-08-18 | Koehler Innovation & Technology Gmbh | Process for the production of a fibrous web |
CN114438827B (en) * | 2022-01-19 | 2024-01-12 | 云南建投第二安装工程有限公司 | Device and method for improving fan box foundation of drying part of pulp machine |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE133217T1 (en) * | 1992-11-24 | 1996-02-15 | Voith Gmbh J M | PRESS SECTION FOR A PAPER MACHINE |
DE19609988A1 (en) * | 1996-03-14 | 1997-09-18 | Voith Sulzer Papiermasch Gmbh | Press section of a paper machine |
CN2345574Y (en) * | 1998-12-30 | 1999-10-27 | 宋大兴 | Counter and consequent three net formed paper making machine without waste water |
FI20002122A (en) * | 2000-06-02 | 2001-12-03 | Metso Paper Inc | Arrangements to improve the beginning of the drying section |
FI111174B (en) * | 2000-10-27 | 2003-06-13 | Metso Paper Inc | Method and apparatus for the tip drawing in a paper machine or corresponding drying portion |
CA2432285A1 (en) * | 2000-12-22 | 2002-08-08 | Vibre-Tech Llc | Method and apparatus for use of vibrational force in papermaking |
FI116400B (en) * | 2002-11-19 | 2005-11-15 | Metso Paper Inc | Press section in a paper or cardboard machine |
AT500751B8 (en) * | 2003-02-20 | 2007-02-15 | Bartelmuss Klaus Ing | DEVICE FOR TREATING, ESPECIALLY FOR IMPRESSION DISTRIBUTION, OF THE AT LEAST ONE SIEVE BAND OR MOVING IN A PAPER GENERATION APPARATUS. felt belt |
DE102004037213A1 (en) * | 2004-07-30 | 2006-03-23 | Voith Paper Patent Gmbh | pressing process |
DE102005000046A1 (en) * | 2005-04-28 | 2006-11-02 | Voith Patent Gmbh | Papermaking machine press section, for the production of super calender paper, has a center roller forming two press nips where the paper passes through with a smooth blanket |
DE102005031202A1 (en) * | 2005-07-01 | 2007-01-25 | Voith Patent Gmbh | Process for producing a paper web, in particular gravure paper |
FI7543U1 (en) * | 2007-02-16 | 2007-06-13 | Metso Paper Inc | Apparatus at the tip of a paper machine or equivalent |
DE102010029580A1 (en) * | 2010-06-01 | 2011-12-01 | Voith Patent Gmbh | Machine for producing a paper web, in particular a sack paper web |
CN203007726U (en) * | 2012-12-10 | 2013-06-19 | 天津光华包装有限公司 | Paper machine |
CN206173736U (en) * | 2016-08-31 | 2017-05-17 | 江苏理文造纸有限公司 | Energy -conserving formula screen cloth dewatering device |
-
2018
- 2018-08-14 DE DE102018119686.5A patent/DE102018119686A1/en active Pending
-
2019
- 2019-07-31 EP EP19749318.2A patent/EP3837394A1/en active Pending
- 2019-07-31 CN CN201980054196.3A patent/CN112585318A/en active Pending
- 2019-07-31 WO PCT/EP2019/070674 patent/WO2020035318A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
DE102018119686A1 (en) | 2020-02-20 |
CN112585318A (en) | 2021-03-30 |
WO2020035318A1 (en) | 2020-02-20 |
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