EP3359733B1 - Procédé de fabrication d'une bande de matière fibreuse - Google Patents

Procédé de fabrication d'une bande de matière fibreuse Download PDF

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Publication number
EP3359733B1
EP3359733B1 EP16766279.0A EP16766279A EP3359733B1 EP 3359733 B1 EP3359733 B1 EP 3359733B1 EP 16766279 A EP16766279 A EP 16766279A EP 3359733 B1 EP3359733 B1 EP 3359733B1
Authority
EP
European Patent Office
Prior art keywords
fibrous pulp
pulp web
dewatering device
hot
tad
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.)
Active
Application number
EP16766279.0A
Other languages
German (de)
English (en)
Other versions
EP3359733A1 (fr
Inventor
Andreas Anzel
Thomas Scherb
Wilhelm Mausser
Klaus Gissing
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Andritz AG
Original Assignee
Andritz AG
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 Andritz AG filed Critical Andritz AG
Publication of EP3359733A1 publication Critical patent/EP3359733A1/fr
Application granted granted Critical
Publication of EP3359733B1 publication Critical patent/EP3359733B1/fr
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Classifications

    • 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
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D21F1/74—Pulp catching, de-watering, or recovering; Re-use of pulp-water using cylinders
    • D21F1/76—Pulp catching, de-watering, or recovering; Re-use of pulp-water using cylinders with suction
    • 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
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0254—Cluster presses, i.e. presses comprising a press chamber defined by at least three rollers
    • 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
    • D21F1/0027—Screen-cloths
    • 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
    • D21F1/0027—Screen-cloths
    • D21F1/0036—Multi-layer screen-cloths
    • 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
    • D21F1/0027—Screen-cloths
    • D21F1/0063—Perforated sheets
    • 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
    • D21F1/0027—Screen-cloths
    • D21F1/0072—Link belts
    • 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
    • D21F1/48—Suction apparatus
    • 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
    • D21F11/006—Making patterned paper
    • 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
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • D21F11/145—Making cellulose wadding, filter or blotting paper including a through-drying process
    • 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
    • D21F3/0209—Wet presses with 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
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • D21F3/0227—Belts or sleeves therefor
    • 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
    • D21F3/0272—Wet presses 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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/10—Suction rolls, e.g. couch rolls
    • 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
    • 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
    • D21F5/18—Drying webs by hot air

Definitions

  • the subject of this invention is a process for producing a fibrous web, in particular for producing a tissue or tissue paper web, according to the preamble of claim 1.
  • the fibrous web is first pre-dewatered with the aid of vacuum to a solids content of about 25% and then dried in the TAD dryer with the aid of large quantities of hot air. This air is heated by burners and with the help of blowers via the TAD hood through the fibrous web in the TAD drum passed, thereby evaporating the water in the fibrous web.
  • the differential pressure between the hood and drum is low.
  • the air permeability of the fibrous web is a critical factor. If the fibrous web is too moist, the hot air can not penetrate the fibrous web. in the At the beginning of the TAD drum, only one impingement drying takes place, namely until the dry content of the fibrous web is high enough so that the air can flow through the fibrous web. Only then does one reach the area of throughflow drying. This undesirable impact drying in the TAD dryer has a detrimental effect on the moisture profile of the fibrous web. In addition, the drying efficiency or energy consumption decreases. To achieve a sufficient dry content often two TAD dryers are arranged one behind the other.
  • the US 5 580 423 A discloses a method for producing a fibrous web in which the fibrous web is dried by means of a TAD drum.
  • a pre-dewatering device In front of the TAD drum there is a pre-dewatering device, which consists of two press rolls, each wrapped in a felt.
  • EP 1 397 587 B1 discloses a tissue machine that dispenses with the use of TAD driers.
  • the fibrous web is pre-dried in a pre-dewatering device, while the fibrous web is embedded between a sieve and a felt and is thereby of hot air at a temperature ⁇ 220 ° C, preferably ⁇ 150 ° C and a specific air flow of less than 50 m 3 / (m 2 ⁇ min) flows through.
  • the transfer of the fibrous web takes place on a Yankee cylinder, where it is finally dried.
  • a Yankee cylinder works only on the principle of impact drying.
  • EP 1 397 587 B1 allows the invention much higher machine speeds or production capacities, as well as better paper quality - in terms of Caliper, bulk, water absorption capacity and Softness.
  • the pre-dewatering device can also be operated without a special embossing belt, and furthermore permits the production of a fibrous web provided with a three-dimensional surface structure.
  • the invention has for its object to increase the dry content of the fibrous web, so that the efficiency of the TAD drum is increased or the energy consumption is reduced.
  • the moisture profile of the fibrous web transverse to the machine direction compared to conventional TAD systems should be uniform and preferably the use of only one TAD drum should be possible.
  • the pre-dewatering should be so gentle that the quality of the fibrous web is not reduced, a pre-dewatering with presses or press belts can compress the fibrous web too much and thus adversely affect the quality.
  • the method uses in contrast to EP 1 397 587 B1 a TAD drum and additionally in the predrying device a very high specific volume flow of the fluid is greater than 100 m 3 / (m 2 .min), in particular greater than 200 m 3 / (m 2 .min), preferably greater than 250 m 3 / (m 2 ⁇ Min) sucked through the fibrous web.
  • the differential pressure in the pre-dewatering device between hood side and suction roller side should be set to greater than 0.25 bar, in particular greater than 0.45 bar, preferably greater than 0.55 bar.
  • the pre-dewatering device is operated at a pressure difference which is orders of magnitude greater than the differential pressure in the TAD drum, which is normally 0.05 bar. Due to this large differential pressure in the Vorentskyss mecanics adopted can also be done there throughflow drying, at least partially.
  • the dry content prior to the TAD drum can be increased from previously about 25% in conventional machines to over 30%, in particular to over 35%, preferably even over 40%.
  • the permeability of the fibrous web increases and in the TAD drum through-flow drying can take place over the entire looping area.
  • the hot fluid may be, for example, hot air or hot steam.
  • Favorable temperature ranges of the hot air are at temperatures of above 150 ° C, in particular above 200 ° C, preferably above 250 ° C.
  • the pre-dewatering device can also be divided into several zones, for example into two zones, as viewed in the machine direction. As a result, drying in the first zone can take place with other operating parameters, for example with a higher pressure, a higher temperature or with another medium.
  • the felt has a fine-pored structure, wherein the average pore size of the fibrous web-facing surface of the felt is smaller than the average pore size of the side facing the suction roll side.
  • a fine and soft felt top to the fibrous web increases the contact area between felt and fibrous web, which promotes Kapillarent camesstation.
  • a coarser felt structure to the suction roll on the other hand favors the removal of water through the perforated suction roller surface into the interior of the roller.
  • the fineness of the finer felt surface should be less than 6.7 dtex, preferably less than 3.3 dtex, the layer directly below it should have a fineness of less than 17 dtex, preferably less than 11 dtex, whereas the opposite felt side facing the suction roll would then be much more open (coarser) should be to facilitate the removal of water through the holes of the suction roll.
  • These values refer to the basic fiber content of the felt.
  • a contact roller which presses gently against the suction roller, thereby improving the contact of the fibrous web with the felt.
  • the fibrous web should not or only to a very small extent be pressed.
  • the contact roller should therefore only have a line force of less than 30 kN / m, better less than 15 kN / m, preferably less than 10 kN / m.
  • the suction roll should have as large a free surface as possible, for example greater than 25%, but better still greater than 35%.
  • the pulp suspension is introduced in a twin-wire former 18 via a headbox 1 between two wires 3, passed over a forming roll 2 and dewatered by means of vacuum boxes (not shown) to a solids content of about 24%.
  • the transfer box 11 then transfers the fibrous web 9 onto a structured TAD sieve 4.
  • the structured TAD sieve 4 can (need not) be moved somewhat slower than the sieve 3, so that the fibers fit well into the depressions of the TAD Sieve 4 (wet crepe), through the suction box 10 for wet structuring, the fibers are sucked into the structure of the TAD sieve 4.
  • the pre-dewatering device 20 has a hood 17, a felt 5 and a suction roll 16.
  • the fibrous web 9 fixed on the TAD wire 4 can be pressed by the press roll (kiss press roll) 15 against the felt 5 and against the suction roll 16. This improves the contact between felt 5 and fibrous web 9.
  • the line force in this press nip is between 5 kN / m and 30 kN / m. At these pressures, only about 20% of the fibers are compacted, the remaining 80% of the fibers are protected by the wells of the TAD sieve 4 and therefore are not compressed.
  • the fibrous web 9 is passed between the felt 5 and the TAD sieve 4 through the pre-dewatering device 20.
  • About the hood 17 in a first zone steam is blown onto the fibrous web 9 and that more than 0.3 tons of steam per ton of pulp, better still more than 0.5 tons of steam per ton of pulp, ideally even more than 1 ton of steam per ton pulp.
  • moist hot air at a temperature of about 150 ° C, preferably blown over 250 ° C through the fibrous web 9.
  • the air humidity of the hot air supplied via the hood 17 should preferably be above 150 g H2O / kg air , in particular above 300 g H2O / kg air , preferably even above 450 g H2O / kg air .
  • the fibrous web 9 is still very moist in the area of the pre-dewatering device 20, hardly any evaporation processes occur here.
  • the viscosity of the water in the fibrous web 9 is lowered by the heat supply, whereby the water is sucked through the suction roller 16 from the fibrous web 9.
  • the fine-pored felt 5 supports draining by capillary drainage.
  • the amount of air supplied via the hood 17 substantially corresponds to the amount sucked off via the suction roller 16.
  • the amounts of air or vapor supplied are more than 100 m 3 / (m 2 .min), in particular more than 200 m 3 / (m 2 .min), preferably even more than 250 m 3 / (m 2 .min).
  • the pressure in the hood 17 is above the ambient pressure, so that no cold ambient air is sucked in via the suction roller 16.
  • the hot air dryer 19 is a TAD dryer and consists of a TAD drum 13 and a TAD hood 14. At a dry content of 35%, a second TAD drum can be omitted.
  • the fibrous web is transferred with a press roller 12 from the TAD sieve 4 to a Yankee cylinder 6.
  • the fibrous web 9 is further dried with hot air supplied via the hood 7 and then scraped off.
  • the Yankee surface is sprayed with chemicals via a coating device 8 so that the fibrous web can be scraped off the Yankee surface more easily.
  • FIG. 2 is shown a further device for carrying out the method according to the invention.
  • the pre-dewatering device 20 is not arranged within the structured TAD sieve 4, but already within the sieve 3 of the twin-wire former 18.
  • the transfer of the fibrous web 9 onto the structured TAD sieve 4 takes place only after the pre-dewatering device 20.
  • the sieve 3 of the twin-wire former 18 can be a structured sieve or an unstructured sieve.

Landscapes

  • Paper (AREA)
  • Nonwoven Fabrics (AREA)

Claims (13)

  1. Procédé de fabrication d'une bande de pâte fibreuse (9), en particulier une bande de papier hygiénique ou de papier ouaté, une suspension de pâte fibreuse (19) étant égouttée dans un formeur à double toile (18) pour former une bande de pâte fibreuse (9) et la bande de pâte fibreuse (9) étant séchée à l'aide d'un sécheur d'air chaud (19), un dispositif de pré-égouttage (20) étant disposé après le formeur à double toile (18) et avant le sécheur d'air chaud (19), la bande de pâte fibreuse (9) étant séchée dans le sécheur d'air chaud (19) sur une toile TAD (4) à l'aide d'un tambour TAD (13) alimenté en air chaud, caractérisé en ce que le dispositif de pré-égouttage (20) comporte un capot (17) et un cylindre aspirant (16) et en ce qu'un fluide chaud s'écoule à travers la bande de pâte fibreuse (9) logée exactement entre un habillage (3, 4, 5) de chaque côté, l'habillage (5) entre le cylindre aspirant (16) la bande de pâte fibreuse (9) étant un feutre (5) et l'habillage (3, 4) entre la bande de pâte fibreuse (9) et le capot (17) étant une toile (3, 4) et en ce qu'un flux volumique spécifique du fluide supérieur à 100 m3/(m2·min), en particulier supérieur à 200 m3/(m2·min), de préférence supérieure à 250 m3/(m2·min), est aspiré par la bande de pâte fibreuse (9) dans le dispositif de pré-égouttage (20).
  2. Procédé selon la revendication 1, caractérisé en ce que la bande de pâte fibreuse (9) est amenée sur une toile structurée (3, 4) à travers le dispositif de pré-égouttage (20) .
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la bande de pâte fibreuse (9) formée entre les deux toiles (3) du formeur à double toile (18) est amenée sur l'une desdites deux toiles (3) à travers le dispositif de pré-égouttage (20).
  4. Procédé selon la revendication 1 ou 3, caractérisé en ce que la bande de pâte fibreuse (9) est formée dans le formeur à toile double (18) entre les deux toiles (3), au moins une toile étant structurée.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que de l'air chaud à une température supérieure à 150°C, en particulier supérieure à 200°C, de préférence supérieure à 250°C s'écoule à travers la bande de pâte fibreuse (9) dans le dispositif de pré-égouttage (20) .
  6. Procédé selon la revendication 5, caractérisé en ce que de l'air chaud humide s'écoule à travers la bande de pâte fibreuse (9) dans le dispositif de pré-égouttage (20), la teneur en humidité étant supérieure à 150 gH2O/kgair, en particulier supérieure à 300 gH2O/kgair, de préférence encore supérieure à 450 gH2O/kgair.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que de la vapeur chaude s'écoule à travers la bande de pâte fibreuse (9) dans le dispositif de pré-égouttage (20).
  8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que la bande de pâte fibreuse (9) parcourt deux zones successives dans le dispositif de pré-égouttage (20), de préférence de la vapeur et de l'air chaud s'écoulant à travers la bande de pâte fibreuse (9) dans la première zone et de l'air chaud s'y écoulant dans la seconde zone.
  9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce que la pression différentielle dans le dispositif de pré-égouttage (20) entre le côté capot et le côté cylindre aspirant est réglée à plus de 0,25 bar, en particulier à plus de 0,45 bar, de préférence à plus de 0,55 bar.
  10. Procédé selon l'une des revendications 1 à 9, caractérisé en ce que le feutre (5) présente une structure poreuse, la taille moyenne des pores de la surface du feutre (5) faisant face à la bande de pâte fibreuse (9) étant inférieure à la taille moyenne des pores de la face faisant face au cylindre aspirant (16).
  11. Procédé selon l'une des revendications 1, 2 ou 4 à 10, caractérisé en ce que la bande de pâte fibreuse (9) est amenée sur la toile TAD (4) à travers le dispositif de pré-égouttage (20).
  12. Procédé selon l'une des revendications 1 à 11, caractérisé en ce que la bande de pâte fibreuse (9) est introduite dans un frictionneur (6) après le tambour TAD (13) .
  13. Procédé selon l'une des revendications 1 à 12, caractérisé en ce qu'un cylindre de contact (15) qui appuie contre le cylindre aspirant (16) est disposé au début du dispositif de pré-égouttage (20) de telle manière que la bande de pâte fibreuse (9) soit pressée contre le feutre (5) .
EP16766279.0A 2015-10-05 2016-09-14 Procédé de fabrication d'une bande de matière fibreuse Active EP3359733B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50843/2015A AT517329B1 (de) 2015-10-05 2015-10-05 Verfahren zur herstellung einer faserstoffbahn
PCT/EP2016/071621 WO2017060049A1 (fr) 2015-10-05 2016-09-14 Procédé de fabrication d'une bande de matière fibreuse

Publications (2)

Publication Number Publication Date
EP3359733A1 EP3359733A1 (fr) 2018-08-15
EP3359733B1 true EP3359733B1 (fr) 2019-05-08

Family

ID=56936403

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16766279.0A Active EP3359733B1 (fr) 2015-10-05 2016-09-14 Procédé de fabrication d'une bande de matière fibreuse

Country Status (6)

Country Link
US (1) US9856603B2 (fr)
EP (1) EP3359733B1 (fr)
CN (1) CN106968121B (fr)
AT (1) AT517329B1 (fr)
ES (1) ES2737828T3 (fr)
WO (1) WO2017060049A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT517330B1 (de) * 2015-10-06 2017-01-15 Andritz Ag Maschf Verfahren zur herstellung einer faserstoffbahn
US10694666B2 (en) 2018-04-16 2020-06-30 Baum Machine, Inc. Harvesting machine having a moisture removal mechanism and a crop converging mechanism
GB2589786B (en) * 2018-06-27 2022-11-30 Kimberly Clark Co Through-air drying apparatus and methods of manufacture
AT522784B1 (de) * 2020-02-25 2021-02-15 Andritz Ag Maschf Vorrichtung und verfahren zum herstellen einer faserstoffbahn
SE2230068A1 (en) * 2022-03-10 2022-11-15 Valmet Oy A machine for producing a fibrous web

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2178586C (fr) * 1993-12-20 2000-07-04 Robert Stanley Ampulski Bande de papier pressee au mouille et procede de production de cette derniere
CA2234305A1 (fr) * 1997-04-03 1998-10-03 Fort James Corporation Secheur a air traversant haute intensite pour conversion de machines a papier classiques a presse humide
US6398916B1 (en) * 1999-12-16 2002-06-04 Valmet Karlstad Ab Simplified through-air drying paper making machine having a twin wire forming section
DE10129613A1 (de) * 2001-06-20 2003-01-02 Voith Paper Patent Gmbh Verfahren und Vorrichtung zur Herstellung einer mit einer dreidimensionalen Oberflächenstruktur versehenen Faserstoffbahn
AT413039B (de) * 2004-01-13 2005-10-15 Andritz Ag Maschf Vorrichtung zum wechseln einer bespannung einer papiermaschine
CA2771007C (fr) * 2004-01-30 2014-06-10 Voith Paper Patent Gmbh Systeme de deshydratation avance
BRPI0506499B1 (pt) * 2004-01-30 2019-12-31 Voith Paper Patent Gmbh sistema avançado de desaguamento
AT508331B1 (de) * 2009-05-19 2011-05-15 Andritz Ag Maschf Verfahren und vorrichtung zur behandlung einer faserstoffbahn in einer langnip-presseinheit

Non-Patent Citations (1)

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Title
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Also Published As

Publication number Publication date
CN106968121A (zh) 2017-07-21
ES2737828T3 (es) 2020-01-16
CN106968121B (zh) 2019-10-25
AT517329B1 (de) 2017-01-15
US9856603B2 (en) 2018-01-02
US20170096775A1 (en) 2017-04-06
WO2017060049A1 (fr) 2017-04-13
AT517329A4 (de) 2017-01-15
EP3359733A1 (fr) 2018-08-15

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