WO2006114351A1 - Procede de production d'une bande de papier, notamment de papier heliographique - Google Patents

Procede de production d'une bande de papier, notamment de papier heliographique Download PDF

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Publication number
WO2006114351A1
WO2006114351A1 PCT/EP2006/060729 EP2006060729W WO2006114351A1 WO 2006114351 A1 WO2006114351 A1 WO 2006114351A1 EP 2006060729 W EP2006060729 W EP 2006060729W WO 2006114351 A1 WO2006114351 A1 WO 2006114351A1
Authority
WO
WIPO (PCT)
Prior art keywords
fibrous web
press
nip
contact
paper
Prior art date
Application number
PCT/EP2006/060729
Other languages
German (de)
English (en)
Inventor
Thomas RÜHL
Ingolf Cedra
Andrea Stetter
Martin Serr
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
Priority to EP06725059A priority Critical patent/EP1888837A1/fr
Publication of WO2006114351A1 publication Critical patent/WO2006114351A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0073—Accessories for calenders
    • D21G1/0093—Web conditioning devices
    • 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
    • D21F3/04—Arrangements thereof
    • 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 water applicator, such as a nozzle moistener.
  • 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 having a sieve thickness of less than 0.7 mm, preferably less than 0.65 mm and having a number of fiber support points greater than 1400 / cm 2 (square centimeters), preferably greater than 1500 / cm 2 (square centimeters), more preferably greater than 1600 / qcm (square centimeters) are particularly suitable for this purpose.
  • 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 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 preferably wets selectively in the cross machine direction before entering the calendering device becomes. By selective moistening in the cross-machine direction, moisture transverse profile fluctuations can be compensated.
  • Fibrous web is brought into contact in each case with a heated roller in a first sequence of Kalandemips and that the other of the two sides of the fibrous web is subsequently brought into contact in a second sequence of Kamémips each with a heated roller.
  • each side of the fibrous web is moistened, which is brought into contact with the heated rollers.
  • 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 succession of Kalander dips.
  • the fibrous web is moistened by means of steam humidifier and / or nozzle moistener.
  • intaglio paper or SC 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. 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 stock inlet gap 7 wrap around the sandwich consisting of upper Formiersieb 11, fibrous web 2 and lower Formiersieb 10 for draining the Fiber 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 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 upper forming fabric 11, fibrous web 2 and lower Formierieb 10 is passed over a Siebsaugwalze 42 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 to the press section 4 is guided. Due to the configuration of the forming section 3 described above, optimal dewatering of the fibrous web 2 takes place, so that it is possible to achieve dry contents of the fibrous web 2 of 18% to 20% at the end of the forming section 3, even at speeds of up to 2000 m / min.
  • the upper forming mesh 11 and the lower forming mesh 10 have a mesh thickness of less than 0.7 mm and have a number of fiber support locations greater than 1500 / cm 2 (square centimeter) ).
  • 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 When passing through the third press nip 16, the upper side 27 of the fibrous web 2 is in contact with a press felt 22 and the lower side 28 of the fibrous web 2 in contact with the smooth surface of the central roller 21.
  • 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.
  • Fibrous web 2 which leads to a significantly improved calendering 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 Because of the smoothing of the fibrous web 2 to be carried out in a subsequent step in an online process (on-line calendering), very high demands are placed on the fibrous web 2 because of the higher calendering speeds compared to the offline process on the cross-sectional quality of area-related mass and moisture. Accordingly, to correct the moisture profile of the fibrous web 2 at a moisture content of less than 50% after the press section 4 in the cross machine direction selectively at least once a dampening solution are applied to the fibrous web 2. After the press section 4, 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.
  • 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 calender 6 is a same two-sided treatment of Fibrous web 2 instead. 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 Kamémips 33 and subsequently, after passing through the Kamémip 34, which is also referred to as an alternating gap, 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 Kamémips 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.

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  • Paper (AREA)

Abstract

L'invention concerne un procédé de production d'une bande de papier ou d'une autre bande de matière fibreuse. 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 presse. 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. 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.
PCT/EP2006/060729 2005-04-28 2006-03-15 Procede de production d'une bande de papier, notamment de papier heliographique WO2006114351A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06725059A EP1888837A1 (fr) 2005-04-28 2006-03-15 Procede de production d'une bande de papier, notamment de papier heliographique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005000045.2 2005-04-28
DE200510000045 DE102005000045A1 (de) 2005-04-28 2005-04-28 Verfahren zur Herstellung einer Papierbahn, insbesondere Tiefdruckpapier

Publications (1)

Publication Number Publication Date
WO2006114351A1 true WO2006114351A1 (fr) 2006-11-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/060729 WO2006114351A1 (fr) 2005-04-28 2006-03-15 Procede de production d'une bande de papier, notamment de papier heliographique

Country Status (3)

Country Link
EP (1) EP1888837A1 (fr)
DE (1) DE102005000045A1 (fr)
WO (1) WO2006114351A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1395302B1 (it) * 2009-08-07 2012-09-05 Trani Metodo di realizzazione di un nastro continuo di carta estensibile in senso longitudinale ed in senso trasversale.-

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5054525A (en) * 1989-06-23 1991-10-08 F. Oberdorfer Gmbh & Co. Double layer forming wire fabric
EP0657579A1 (fr) * 1993-12-08 1995-06-14 Valmet Paper Machinery Inc. Section de pressage d'une machine à papier utilisant une presse à zone de pressage prolongée
US5611892A (en) * 1991-12-19 1997-03-18 Valmet Corporation Compact press section in a paper machine
US5759353A (en) * 1995-08-24 1998-06-02 Valmet Corporation Web former in a paper machine
US5810974A (en) * 1995-10-20 1998-09-22 Valmet Corporation Press section including an extended-nip press with an internally heated center roll
WO1999025922A1 (fr) * 1997-11-14 1999-05-27 Valmet Corporation Procede de production de papier calandre
US20040083910A1 (en) * 1999-09-29 2004-05-06 Antti Heikkinen Multi-roll calender
WO2004101885A1 (fr) * 2003-05-13 2004-11-25 Mitsubishi Heavy Industries, Ltd. Presse a lisser de presse a papier, presse de machine a papier a presse a lisser, et procede de fabrication de papier
WO2005010275A2 (fr) * 2003-07-23 2005-02-03 Voith Paper Patent Gmbh Procede et dispositif de production d'une bande de matiere fibreuse, notamment d'une bande papier sc-a- ou sc-b

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5054525A (en) * 1989-06-23 1991-10-08 F. Oberdorfer Gmbh & Co. Double layer forming wire fabric
US5611892A (en) * 1991-12-19 1997-03-18 Valmet Corporation Compact press section in a paper machine
EP0657579A1 (fr) * 1993-12-08 1995-06-14 Valmet Paper Machinery Inc. Section de pressage d'une machine à papier utilisant une presse à zone de pressage prolongée
US5759353A (en) * 1995-08-24 1998-06-02 Valmet Corporation Web former in a paper machine
US5810974A (en) * 1995-10-20 1998-09-22 Valmet Corporation Press section including an extended-nip press with an internally heated center roll
WO1999025922A1 (fr) * 1997-11-14 1999-05-27 Valmet Corporation Procede de production de papier calandre
US20040083910A1 (en) * 1999-09-29 2004-05-06 Antti Heikkinen Multi-roll calender
WO2004101885A1 (fr) * 2003-05-13 2004-11-25 Mitsubishi Heavy Industries, Ltd. Presse a lisser de presse a papier, presse de machine a papier a presse a lisser, et procede de fabrication de papier
EP1662042A1 (fr) * 2003-05-13 2006-05-31 Mitsubishi Heavy Industries, Ltd. Presse a lisser de presse a papier, presse de machine a papier a presse a lisser, et procede de fabrication de papier
WO2005010275A2 (fr) * 2003-07-23 2005-02-03 Voith Paper Patent Gmbh Procede et dispositif de production d'une bande de matiere fibreuse, notamment d'une bande papier sc-a- ou sc-b

Also Published As

Publication number Publication date
DE102005000045A1 (de) 2006-11-02
EP1888837A1 (fr) 2008-02-20

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