EP1910613A1 - Procede de fabrication d'une bande continue de papier, en particulier de papier heliographique - Google Patents

Procede de fabrication d'une bande continue de papier, en particulier de papier heliographique

Info

Publication number
EP1910613A1
EP1910613A1 EP06763781A EP06763781A EP1910613A1 EP 1910613 A1 EP1910613 A1 EP 1910613A1 EP 06763781 A EP06763781 A EP 06763781A EP 06763781 A EP06763781 A EP 06763781A EP 1910613 A1 EP1910613 A1 EP 1910613A1
Authority
EP
European Patent Office
Prior art keywords
press
fibrous web
nip
contact
section
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.)
Withdrawn
Application number
EP06763781A
Other languages
German (de)
English (en)
Inventor
Ulrich Begemann
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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 Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1910613A1 publication Critical patent/EP1910613A1/fr
Withdrawn legal-status Critical Current

Links

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
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • 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
    • 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
    • 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
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus

Definitions

  • the invention relates to a method for producing a paper or another fibrous web according to the preamble of patent claim 1.
  • SC super calendered
  • roll-blade shapers i. H. Screen former with a forming roller and drainage strips, without flexible strips in conjunction with a downstream conventional press section built with three press nips.
  • the press nips can also be formed by shoe press rolls.
  • a free-standing press unit is preferably arranged for a fourth press nip.
  • the fibrous web is smoothed by at least two offline multi-nip calenders which follow the paper machine production at a lower calendering speed.
  • the fibrous web is usually dried in the dryer section to a residual moisture content of 2 to 3% and moistened before the reeling station still within the paper machine with the help of a Wasser foundedsaggregates, such as a Düsenfeuchters.
  • the residence time of the wound with the paper web of the after winding in the paper machine to the calendering of the paper web in the calenders is between 0.5 and 2 hours. Thanks to the drying out and the long dwell time, a very good moisture distribution in all directions within the paper web can be assumed.
  • a roll-blade former with or without flexible twin-mesh bars is used in conjunction with two freestanding shoe presses or a freestanding roller press and a subsequent shoe press in conjunction with a multi-pin calender.
  • a roll-blade former with or without flexible strips in the twin-wire area and a conventional three-nip press with or without Schuhnip used in conjunction with a multi-pin calender.
  • the productivity in an online process can be significantly higher due to the loss of rewinding losses caused by winding, unwinding and rewinding the paper web after calendering.
  • a conventional press section which is designed as a three-nip press without an additional free-standing fourth press, generally shows a very strong
  • the press configurations with two free-standing press nips are either fourfold felted or have an impermeable transfer belt in the second lower position.
  • a supported web run is possible with little trains.
  • this results in increased roughness of the base paper.
  • the base paper has increased two-sidedness.
  • this object is achieved by a method for producing a paper or another fibrous web, in which the fibrous web is subjected to pressure in a press section at several press nips, wherein one side of the fibrous web in contact with a smooth surface through the penultimate press nip of the press section is guided and wherein the one side opposite side of the fibrous web is guided in contact with a smooth surface through the last press nip of the press section.
  • the fibrous web is thus smoothed on both sides at low dry contents in the two last press nips of the press section, since each side of the fibrous web is guided with a smooth side into contact through a press nip becomes.
  • the last two press nips a two-sided macro-smoothing of the surface of the fibrous web, which leads to a significantly improved calendering in the subsequent calender.
  • the smooth surface with which the fibrous web is brought into contact when passing through a press nip can be formed both by a roll cover with a smooth cover or by a smooth transfer belt.
  • this may be permeable or impermeable depending on the application.
  • the press section comprises a three-nip press with a central roll and a free-standing press with a single nip, wherein the third nip of the three-nip press is the penultimate press nip of the press section and wherein the Einzelnip the freestanding Press is the last press nip of the press section.
  • a further embodiment of the invention provides that the fibrous web is passed together with a transfer belt through the second and third press nips of the three-nip press formed between the central roll and the press rolls.
  • the one side of the fibrous web is guided in contact with the transfer belt and the other side of the fibrous web in contact with a press felt through the penultimate press nip.
  • dewatering takes place in the direction of the press felt, whereas the fibrous web is smoothed by contact with the smooth transfer ribbon in the wet state.
  • the press as described above, for example, formed by a three-nip press with central roll and downstream freestanding press with a single nip, so preferably one side of the fibrous web in contact with the lateral surface of the central roll and the other side of the fibrous web in Contact with a press felt passed through the third press nip of the three-nip press forming the penultimate press nip of the press.
  • one side of the fibrous web in contact with a press felt and the other side of the fibrous web in contact with the shell surface of the press roll pass through the last press nip, which can be formed by the single press nip of the free-standing press.
  • the dry content of the fibrous web can be increased.
  • the dry content is increased by 4%.
  • the smoother effect is enhanced by the longer residence time of the fibrous web in the shoe press nip compared to conventional press nips.
  • the fibrous web is guided, for example, on the transfer belt through the three-nip press and then through the single press nip of the freestanding press, it makes sense if the fibrous web by a transfer suction of the Transfer belt is transferred to the press felt on which this happens the only press nip the freestanding press.
  • a preferred embodiment of the method according to the invention provides that, in order to correct the moisture transverse profile of the fibrous web at a moisture content of less than 50%, preferably after the press section, at least once in the cross-machine direction a fountain solution is applied to the fibrous web.
  • the fibrous web is formed in a vertical gap former, in particular twin-wire former.
  • the gap former has flexible formation strips. As a result, the formation and the pressure balance in half and full tones is improved. Experiments have shown that by using flexible formation strips in a drainage range between 2% and 8% dry content, preferably between 3% and 6% dry content, the formation index according to Ambertec can be significantly reduced.
  • the formation strips are advantageously pressed against the sandwich, consisting of the two forming fabrics with interposed fibrous web, with a contact pressure in the range between 5kPA and 3OkPa, preferably between 8kPa and 25kPa.
  • the flexible formation strips cause additional drainage in the twin-wire area.
  • the wrap angle of the forming roll through the two forming fabrics is between 30 ° and 60 °, preferably between 40 ° and 55 °.
  • the forming fabrics used should ensure a sufficiently high dewatering rate, a low
  • Forming fabrics with a sieve thickness of less than 0.7 mm, preferably less than 0.65 mm and with a number of fiber support points of more than 1400 / cm 2 , preferably more than 1500 / cm 2 , more preferably more than 1600 / cm 2 are for this purpose particularly suitable.
  • the fibrous web passes through a drying section and is dried in this.
  • a drying section There are different ways to dry the fibrous web, for example by drying on heated cylinders or by Impallströmtrocknung with hot air.
  • the press section consists only of three press nips and is additionally arranged between the press section and the actual dryer section an impingement drying device, also called impingement drying device.
  • impingement drying device also called impingement drying device.
  • the three press nips are formed by a three-nip press with a central roll and two press rolls. This results in a compact construction and therefore has advantages in terms of space requirements and production costs.
  • the first and / or the third press nip can in this variant be designed in each case as a roller press or as a shoe press. With shoe presses, the drying performance can be increased.
  • a preferred embodiment of the impingement drying device or impingement device consists in a high dryer, which in particular comprises two drying cylinders and impingement hoods. It is preferred if the drying cylinders are slightly sucked. For the suction advantageously stabilizers can be used.
  • the drying cylinders of the impingement drying device preferably have one Diameter of 3 feet or more.
  • the multi-pin calendering device can have between 6 and 12 rollers.
  • the multinip calendering device is an on-line calendering device, since, for example, offline calenders permit significantly lower web speeds and a repeated rewinding of the paper web is necessary.
  • a preferred embodiment of the method according to the invention therefore provides that the moisture content of the fibrous web when leaving the dryer section is below the equilibrium moisture content at standard conditions.
  • a further preferred embodiment of the method according to the invention further provides that the fibrous web is preferably wetted selectively in the cross machine direction before entering the calendering device. By selective moistening in the cross-machine direction, moisture transverse profile fluctuations can be compensated.
  • a preferred embodiment of the invention therefore provides that one of the two sides of the fibrous web is brought into contact in each case with a heated roller in a first sequence of Kariemips and that the other of the two sides of the fibrous web in a second sequence of Kariemips each is brought into contact with a heated roller.
  • another embodiment provides that the fibrous web is moistened on both sides prior to entry into the calendering device.
  • Best smoothness of the calendered fibrous web is achieved when the fibrous web is moistened to a moisture content of 7% to 9%, preferably to a moisture content of 8%.
  • the fibrous web has a moisture content of 7% to 9%, preferably 8%, before each sequence of calender nips.
  • the fibrous web is moistened by means of steam humidifier and / or nozzle moistener.
  • intaglio paper or SC or SCA + paper which preferably has a filler content of 25% or more, more preferably a filler content of 30% or more.
  • Figure 1 is a schematic view of a paper machine for carrying out the method according to the invention.
  • FIG. 2 shows a variant of FIG. 1.
  • FIG. 1 shows a paper machine 1 for producing SC paper, which preferably has a filler content of 25% or more.
  • the fibrous web 2 is formed in the formed as a vertical gap former Formierpartie 3 in a stock inlet gap 7 between an upper Formiersieb 11 and a lower Formierieb 10. After the fabric inlet gap 7 wrap around the sandwich consisting of upper forming fabric 11, fibrous web 2 and lower forming fabric 10 for dewatering the fibrous web 2 a forming roller 8 in the angular range between 30 ° and 60 °, preferably between 40 ° and 55 °.
  • the fibrous web 2 is further dehydrated in a drainage range between 2% and 8% dry content, preferably between 3% and 6% dry content by means of three flexible formation strips 12.
  • the flexible one Formation strips 12 are in this case pressed with a contact pressure in the range between 8 kPa and 25 kPa against the sandwich consisting of upper forming fabric 11, fibrous web 2 and lower forming fabric 10.
  • the fibrous web has an upper side 27 and a lower side 28 arranged opposite the upper side 27.
  • the sandwich consisting of upper Formierieb 11, fibrous web 2 and lower Formierieb 10 is passed over a Siebsaugwalze 13 before the upper Formiersieb 11 is lifted from the upper side 27 of the fibrous web 2 and this with the lower side 28 on the lower Formierieb 10 for Press section 4 is performed.
  • the upper forming mesh 11 and the lower forming mesh 10 have a mesh thickness smaller than 0.7 mm and have a number of fiber support sites of more than 1500 / cm 2 .
  • the fibrous web 2 is transferred at the end of the forming section 2 via a pick-up roller 24 from the lower forming fabric 10 to a press felt 20 of the press section 4.
  • the fibrous web 2 is guided on its upper side 27 to a first press nip 14 of a three-nip press 13 and guided in a sandwich between the press felt 20 and a press felt 19 through the first press nip 14.
  • the three-nip press 13 has a central roller 21 which forms a second press nip 15 with a roller 25 and a third press nip 16 with a roller 26.
  • the third press nip 16 is the penultimate press nip of the press section represents.
  • the fibrous web 2 passes through the single press nip 17 of a free-standing press 18.
  • the press nip 17 forms the last press nip of the press section 4.
  • the fibrous web 2 at a low dry content in the last two press nips 16, 17 of the press section 4 is successively smoothed on both sides 27, 28, since each side 27, 28 of the fibrous web 2 with a smooth side in contact by one of the press nips 16, 17 is led.
  • a two-sided macro-smoothing of the surface of the fibrous web 2 which leads to a significantly improved calenderability in the subsequent calender.
  • the penultimate press nip 16 and / or the last press nip 17 could be formed as a shoe press nip. Furthermore, the longer dwell time of the fibrous web 2 in the shoe press nip would increase the smoothness effect compared to conventional press nips.
  • the fibrous web 2 is transferred to the dryer section 5, which in the present embodiment has a plurality of single-row arranged drying cylinder 30 and is not fully shown in its length. After drying the fibrous web 2 in the dryer section 5, this is fed to an online multi-pin calendering device 6.
  • the fibrous web When leaving the dryer section 5, the fibrous web has a moisture content that is below the equilibrium moisture content at standard climate.
  • the fibrous web 2 has a moisture content of about 2.5%.
  • the fibrous web 2 Before entering the calendering device 6, the fibrous web 2 is selectively moistened in the cross machine direction, so that the fibrous web 2 has a uniform moisture content of about 8% over the web width.
  • the moistening takes place on the lower side 28 of the fibrous web 2 by means of a nozzle moistener 35, which is designed as a two-component nozzle moistener, from which an air-dampening solution mixture emerges.
  • the on-line multi-pin calender 6 has six elastic rollers 31 and four heating rollers 32, which form eight calender nips 33 and one calender nip 34.
  • the calendering device 6 is a same two-sided treatment of the fibrous web 2 takes place. This is achieved by first bringing the lower side 28 of the fibrous web 2 in contact with one of the heating rollers 32 in a first sequence 37 of four calendering nips 33 and subsequently, after passing through the calendering nip 34, which is also referred to as an alternating nip, the upper side 27 of the fibrous web 2 is brought into contact with one of the heating rollers 32 in a second sequence 38 of four calendering nips 33.
  • the fibrous web 2 After leaving the first sequence 37 of Kalandemips 33 and before entering the second sequence 38 on Kalandemips 38, the upper side 27 of the fibrous web 2 by means of a Düsenfeuchters 36, which is designed as Zweistoffdüsenbefeuchter moistened. After this moistening, the fibrous web 2 has a moisture content of about 8%.
  • steam humidifiers 39 to 41 are provided in order to apply the required amount of moisture to the fibrous web 2.
  • an impingement drying device or impingement drying device 42 is provided. This comprises a first vacuumed drying cylinder 43 and a second vacuumed drying cylinder 44 disposed opposite thereto. Furthermore, the impingement drying device 42 has a clothing 55 which wraps around the first drying cylinder 43 in sections and a clothing 56 which wraps around the second drying cylinder 44 in sections.
  • the fibrous web 2 is not guided between the clothing cylinders 55 and 56 wrapping around the drying cylinders 43 and 44 so that the fibrous web 2 is not pressed against the drying cylinders 43 and 44 by them, which results in web guiding problems can.
  • the suction of the two drying cylinders 43 and 44 the guidance of the fibrous web 2 is improved by the impingement drying device 42.
  • the two fabrics 55 and 56 are each formed as a sieve.
  • the first drying cylinder 43 is provided with an overhead hot air hood 45
  • the second drying cylinder 44 is provided with two underlying hot air hoods 46, each of which hot air is directed directly to the fibrous web 2 and which, in contrast to the TAD principle, not by the Fiber web 2 occurs, but is reflected back from the fibrous web 2. This will increase the dry performance considerably increased. Accordingly, in the impingement drying device 42, the hot air is directed by the hot air hoods 45 and 46 directly onto the fibrous web 2 without any stringing therebetween.
  • the central roller 21 is looped by a transfer belt 47, which is guided with the paper web 2 through the second and the third press nip 15, 16. From the transfer belt 47, the fibrous web 2 is removed by means of a suction roll 48 and transferred to the first drying cylinder 43.
  • the suction roll 48 is looped by a felt belt 49, which is also guided over three web guide rollers 50.
  • the fibrous web 2 is transferred directly to the second drying cylinder 44. From this, the fibrous web 2 passes through a roller 51 and a suction roller 52 in the drying section 5. The suction roller 52 is thereby looped by the dryer felt 53 of the dryer section 5. Of the drying section 5, only the first two drying cylinders 30 are shown.
  • the two drying cylinders 43 and 44 are each sucked by stabilizers 54 which are arranged outside the two drying cylinders 43, 44 on the side facing away from the impingement hoods 45, 46.
  • the stabilizers 54 are located in each case within the loops formed by the wires 55, 56, which loop around the first drying cylinder 43 and the second drying cylinder 44 of the impingement drying device 42 in sections.
  • each web guide rollers 57, 58 are provided for the loops.

Abstract

L'invention concerne un procédé de fabrication d'une bande continue de papier ou d'une autre matière fibreuse, procédé dans lequel la bande de matière fibreuse est soumise à une pression dans une avant-dernière ligne de contact entre deux rouleaux, puis dans une dernière ligne de contact entre deux rouleaux d'une partie de pressage. Le procédé est caractérisé en ce qu'une face de la bande de matière fibreuse est mise en contact avec une surface lisse lors du passage par l'avant-dernière ligne de contact entre deux rouleaux, et en ce que l'autre face de la bande de matière fibreuse est mise en contact avec une surface lisse, lors du passage par la dernière ligne de contact entre deux rouleaux.
EP06763781A 2005-07-01 2006-06-20 Procede de fabrication d'une bande continue de papier, en particulier de papier heliographique Withdrawn EP1910613A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005031202A DE102005031202A1 (de) 2005-07-01 2005-07-01 Verfahren zur Herstellung einer Papierbahn, insbesondere Tiefdruckpapier
PCT/EP2006/063332 WO2007003504A1 (fr) 2005-07-01 2006-06-20 Procede de fabrication d'une bande continue de papier, en particulier de papier heliographique

Publications (1)

Publication Number Publication Date
EP1910613A1 true EP1910613A1 (fr) 2008-04-16

Family

ID=36954417

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06763781A Withdrawn EP1910613A1 (fr) 2005-07-01 2006-06-20 Procede de fabrication d'une bande continue de papier, en particulier de papier heliographique

Country Status (6)

Country Link
US (1) US20080236776A1 (fr)
EP (1) EP1910613A1 (fr)
JP (1) JP2008545068A (fr)
CN (1) CN101213340A (fr)
DE (1) DE102005031202A1 (fr)
WO (1) WO2007003504A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007002514A1 (de) * 2007-01-17 2008-07-24 Voith Patent Gmbh Verfahren zum Herstellen von hochwertigen Papieren
US9481777B2 (en) 2012-03-30 2016-11-01 The Procter & Gamble Company Method of dewatering in a continuous high internal phase emulsion foam forming process
DE102018119686A1 (de) * 2018-08-14 2020-02-20 Voith Patent Gmbh Papiermaschine
DE102020111746A1 (de) 2020-04-30 2021-11-04 Voith Patent Gmbh Maschine zur herstellung oder behandlung einer faserstoffbahn

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0289477A3 (fr) * 1987-04-28 1989-03-08 Valmet Paper Machinery Inc. Procédé pour le pressage à chaud d'une bande de papier et dispositif de séchage pour l'application du procédé
DE4042480C2 (de) * 1990-08-17 2000-02-10 Voith Gmbh J M Pressenpartie einer Papiermaschine
DE4141607C2 (de) * 1991-12-17 1996-04-25 Voith Gmbh J M Doppelsiebformer
US5639351A (en) * 1991-12-23 1997-06-17 Valmet Corporation Press section of a paper machine, in particular for printing paper qualities
FI112391B (fi) * 1993-12-08 2003-11-28 Metso Paper Inc Paperikoneen puristinosa, jossa käytetään pitkänippipuristinta
US5868904A (en) * 1993-12-08 1999-02-09 Valmet Corporation Press section employing an extended nip press with suction counter roll
US5876565A (en) * 1994-10-06 1999-03-02 Valmet Corporation Press section with an equalizing nip for compensating for elongation of a paper web
FI955014A (fi) * 1995-10-20 1997-04-21 Valmet Corp Paperikoneen puristinosa, jossa käytetään pitkänippipuristinta
FI109481B (fi) * 2001-05-16 2002-08-15 Metso Paper Inc Menetelmä paperin tai kartongin valmistamiseksi
DE10159115A1 (de) * 2001-12-01 2003-06-18 Voith Paper Patent Gmbh Pressenpartie
EP1662042B1 (fr) * 2003-05-13 2009-11-04 Oji Paper Co., Ltd. Presse a lisser de presse a papier, presse de machine a papier a presse a lisser, et procede de fabrication de papier
DE10355686A1 (de) * 2003-11-28 2005-06-23 Voith Paper Patent Gmbh Papiermaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007003504A1 *

Also Published As

Publication number Publication date
US20080236776A1 (en) 2008-10-02
WO2007003504A1 (fr) 2007-01-11
DE102005031202A1 (de) 2007-01-25
JP2008545068A (ja) 2008-12-11
CN101213340A (zh) 2008-07-02

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