EP1314818B1 - Appareil et procédé pour lisser une bande de papier ou de carton - Google Patents

Appareil et procédé pour lisser une bande de papier ou de carton Download PDF

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Publication number
EP1314818B1
EP1314818B1 EP02024064A EP02024064A EP1314818B1 EP 1314818 B1 EP1314818 B1 EP 1314818B1 EP 02024064 A EP02024064 A EP 02024064A EP 02024064 A EP02024064 A EP 02024064A EP 1314818 B1 EP1314818 B1 EP 1314818B1
Authority
EP
European Patent Office
Prior art keywords
web
nip
roll
heated
rests
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.)
Expired - Fee Related
Application number
EP02024064A
Other languages
German (de)
English (en)
Other versions
EP1314818A1 (fr
Inventor
Rüdiger Dr. Kurtz
Josef Schneid
Thomas Hermsen
Udo Gabbusch
Harald Hess
Rainer Fenske
Alexander Wassermann
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 Paper 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 Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1314818A1 publication Critical patent/EP1314818A1/fr
Application granted granted Critical
Publication of EP1314818B1 publication Critical patent/EP1314818B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/006—Calenders; Smoothing apparatus with extended nips

Definitions

  • the invention relates to a device for smoothing a Paper or board web with a first section, in which a first side of the web on a heated band and the opposite second side on a cooled Band is present, and with a second section. Further The invention relates to a method for smoothing a Paper or board web, where the web between a heated first volume on her first page and one cooled second volume on its second side over a predetermined distance is performed.
  • Condebelt Such a device and method are known from EP 0 478 525 B1.
  • the device will also referred to as "Condebelt".
  • Condebelt is It is possible to dry a paper or board web and at the same time the voltage applied to the heated band Smooth page. The drying is achieved by that you are on the opposite side of the heated band Side by the cooling of the there Bandes a condensation effect and thus a reduction achieved the partial pressure of the steam, so that the moisture in the train from the hot to the cold side wanders. As a side effect arises a smoothing of the surface of the side of the web, the on the heated band is applied.
  • US 5 163 364 A describes a method for calendering a paper or board web where the web passed through two successively arranged broad nips becomes.
  • each wide nip there are working surfaces, by a roller on the one hand and by a circulating On the other hand. Both working surfaces run parallel to each other and are heated.
  • second nip may be provided a steam applicator.
  • WO 01/83883 A1 describes a method for calendering a board web in which the web through a Wide nip is guided between a heated Roller and a circumferential coat is formed.
  • the heated roller is heated to over 200 ° C, preferably even heated to over 250 ° C.
  • the train can pass before of the broad nip are moistened.
  • the invention is based on the object, a train smooth on both sides.
  • a broad-nip press is arranged, in which a smooth, heated hard roller and a circumferential jacket, the by means of a support shoe against the roller, a Nip through which the web runs, with the second Side of the roller rests, which has a surface temperature ranging from 95 ° C to less than 100 ° C.
  • the second Side of the train due to the steam outlet in the first Section has increased roughness, smoothed becomes. It makes use of the fact that the Train to the second side for a relatively long time rests against the smooth hard roller, so that sufficient Time is available to smooth the surface hard roller to transfer to the second side of the web.
  • the wide nip has a much greater length (seen in the direction of the web) as a nip, the is formed between two opposite rollers. Accordingly, not only is there a longer residence time and thus a longer press time available, but the compressive stress in the nip can be opposite the compressive stress in a formed between two rolls Nip be greatly reduced in size.
  • the train itself becomes practically not or not worth mentioning Dimensions compacted. So you reach with relative simple measures a smoothing even the second Side of the train.
  • the coat can be on different Species be trained.
  • One possibility is the use a relatively stiff coat that is elastic is enough to adapt to the curvature of the roll, but otherwise practically circulates in the manner of a roller.
  • This jacket can be provided with discs on the front side be.
  • Another possibility is the use a less stiff band, which has support rollers in a circulation is performed, the pulleys practically define a polygon. Such a band can also be relatively thin.
  • the roller When the roller is heated, then it has an improved smoothing effect on the second side of the train.
  • the heating of the roller is one relatively simple measure to improve the smoothness values. At a surface temperature of at least 95 ° C is assumed that the fibers on the surface be plasticized to some extent. Due to the relatively long exposure time to the web in the nip must, however, the temperatures not too high either. If you are below 100 ° C remains, there is no steam, which the surface during Exit from the broad nip could "rip" again.
  • the support shoe has a concave curvature on, which is adapted to the curvature of the roll.
  • the curvature of the support shoe follows the Curvature of the roll at a predetermined distance, wherein the distance determined by the thickness of the shell is. This is a relatively uniform pressurization scored the track in the nip.
  • the average compressive stress in the nip is in the range of 0.1 to 3 N / mm 2 .
  • this compressive stress range a significant compression of the web, ie the decrease of the bulk, is not to be feared. Nevertheless, the compressive stress is sufficient to achieve the desired smoothness on the second side of the web.
  • the jacket is formed vapor-impermeable.
  • the roller is not permeable to steam.
  • This embodiment has the advantage that at the Smooth the second side of the web no deterioration the surface properties of the first side of the Train through exiting steam must be accepted. Of the Rather, steam, if it arises at all, is in the Kept track.
  • the invention is in a method of the aforementioned Art solved by the fact that the web afterwards a broad nip is led through a hard, heated smooth roller and a sheath is formed, which over a predetermined peripheral portion on the roller is applied, with the second side of the web on the roller which is at a surface temperature in the range of 95 ° C heated to below 100 ° C.
  • the roller then serves to the second side of the Smooth course.
  • the smoothing is done by a relatively long residence time of the track in the nip, in which the surface of the smooth, hard roller on the surface memorize the second side of the web.
  • the Heating is a relatively simple measure to the To improve smoothing effect of the roller.
  • the moisture of the web is adjusted to a maximum of 12% before entering the nip one.
  • the train should be pretty “dry", when she goes through the wide nip.
  • the web is preferably applied in the nip with a compressive stress in the range from 0.1 to 3 N / mm 2 .
  • This compressive stress range ensures that the web is not over-compacted.
  • the compressive stress allows the surface of the hard, smooth roller to be impressed on the surface of the web.
  • the roll is left with a predetermined Rotate slip against the web. This also contributes to smooth the web.
  • the slip results there is a relative movement between the roller and the railway that leads to a "polishing" of the railway.
  • the residence time is preferably in the range from 1.5 to 15 ms.
  • the web before entering in the wide nip on the side that rests against the roller is moistened, especially with steam. If the rougher Side of the web before applying to the smooth roller moistened and preferably heated, is the smoothness increase even bigger with the hard roller.
  • a device 1 for smoothing a paper or board web 2 (in the following short: train) has a first Section 3, in which the web 2 between two bands 4, 5 is performed ,.
  • the web 2 with a first side 6 on the upper band 4 and with a second side 7 on the lower band 5.
  • the band 4 is over two pulleys 8, 9 out.
  • the bottom strand of the upper belt 4 is from a heater 10 heated.
  • the lower band 5 is guided over deflection rollers 11-14. It is in the area between the pulleys 11, 12 from Supported upper strand of a support band 15 and of a cooling device 16 cooled.
  • the support band 15 and the band 5 are moisture permeable.
  • the tape 5 as a felt belt and the support band 15 as Screen formed.
  • the upper band 4 is formed for example as a metal band, i.e. It has a relatively smooth surface on, which is in the surface of the first page 6 of the Imprinting web 2.
  • the surface of the second page 7 is after leaving of the first section 3, however, extraordinarily rough, because here on the one hand the surface of the band 5, for example made of felt, in the surface of Lane 2 has impressed. For another is through the second Page 7 the steam escaped, causing a further increase the roughness contributes.
  • a second section 17 is provided, in which a Breitnippresse 18 is arranged.
  • the nip press 18 has a roller 19, which is smooth, hard and heated Roller is formed.
  • a heating device is not shown in detail. The heating can be on many different types take place, for example with a hot liquid, such as water or oil, with steam, electrically or by heat radiation.
  • the roller 19 With the roller 19 cooperates a jacket 20, the is pressed by a support shoe 21 to the roller and forms a wide nip 22 with the roller. Between the support shoe 21 and the jacket 20 is a hydraulic Support provided, a lubrication and Slip film produced.
  • the nip has a width, so one Length in the direction of the web 2, in the order from about 70 to about 250 mm.
  • the jacket 20 is over only schematically illustrated guide rollers 23-25 out.
  • the Support shoe 21 has a convex pressure surface 26, whose curvature is adapted to the curvature of the roller 19.
  • the roller 19 has a surface temperature in the range of 95 ° C to below 100 ° C on. She can do it at a speed be driven, which is slightly different from the speed the web 2 is different, so that a slip between the web 2 and the circumference of the roller 19 arises.
  • the web 2 is already comparatively dry. It has a moisture content of at most 12%. In nip 22 there is a compressive stress in the range of 0.1 to 3 N / mm 2 . In this way, it is possible that the surface of the hard, smooth roller 19 is impressed in the surface of the second side 7 of the web 2, without the web 2 is more compacted. The bulk remains virtually unchanged. Nevertheless, after passing through the nip 22, a web 2 is obtained whose two sides 6, 7 are relatively smooth.
  • the width of the nip 22 depends, among other things the desired smoothing result. Depending on the Speed of the web 2 becomes the width of the nip 22 chosen so that the web in the nip 22 a residence time in Range of 1.5 to 15 ms.
  • a steam applicator 27 is arranged, on the rougher side of the web 2.
  • the steam humidifies and warms this side, so that the hard, smooth roller 19 even more effective can smooth.

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  • Paper (AREA)

Claims (11)

  1. Procédé pour lisser une nappe de papier ou de carton (2), comprenant une première portion (3) dans laquelle un premier côté (6) de la nappe (2) s'applique contre une bande chauffée (4) et le deuxième côté opposé (7) s'applique contre une bande refroidie (5), et comprenant une deuxième portion (17), caractérisé en ce qu'une presse à large ligne de contact (18) est disposée dans la deuxième portion (17), dans laquelle un cylindre lisse, dur et chauffé (19) et une enveloppe périphérique (20), qui s'applique à l'aide d'un patin de support (21) contre le cylindre (19), forment une ligne de contact (22), à travers laquelle passe la nappe (2), le deuxième côté (7) de la nappe (2) s'appliquant contre le cylindre (19) qui présente une température de surface dans la plage de 95°C à en dessous de 100°C.
  2. Dispositif selon la revendication 1, caractérisé en ce que le patin de support (21) présente une courbure concave (26), qui est adaptée à la courbure du cylindre (19).
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que la tension de compression moyenne dans la ligne de contact (22) est située dans la plage de 0,1 à 3 N/mm2.
  4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'enveloppe est réalisé de manière imperméable à la vapeur.
  5. Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'avant la ligne de contact (22), est disposé un dispositif d'application de vapeur (27) du côté de la nappe (2) qui s'applique contre le cylindre (19).
  6. Procédé pour lisser une nappe de papier ou de carton (2), dans lequel la nappe (2) est guidée sur une distance prédéterminée entre une première bande chauffée (4) sur son premier côté (6) et une deuxième bande refroidie (5) sur son deuxième côté (7), caractérisé en ce que la nappe (2) est ensuite guidée à travers une large ligne de contact (22) qui est formée par un cylindre dur, lisse et chauffé (19) et une enveloppe (20), qui s'applique sur une portion prédéterminée de la périphérie contre le cylindre (19), le deuxième côté (7) de la nappe (2) s'appliquant contre le cylindre (19) qui est chauffé à une température de surface dans la plage de 95°C à en dessous de 100°C.
  7. Procédé selon la revendication 6, caractérisé en ce que l'on ajuste l'humidité de la nappe à 12% au maximum avant l'entrée dans la ligne de contact large.
  8. Procédé selon la revendication 6 ou 7, caractérisé en ce que l'on sollicite la nappe dans la ligne de contact large avec une tension de compression dans la plage de 0,1 à 3 N/mm2.
  9. Procédé selon l'une quelconque des revendications 6 à 8, caractérisé en ce que l'on laisse tourner le cylindre avec un glissement prédéterminé contre la bande.
  10. Procédé selon l'une quelconque des revendications 6 à 9, caractérisé en ce que l'on choisit la longueur efficace de la ligne de contact large de telle sorte que la nappe présente un temps de résidence dans la ligne de contact large d'au moins 1,5 ms.
  11. Procédé selon l'une quelconque des revendications 6 à 10, caractérisé en ce que la nappe est humidifiée avant son entrée dans la ligne de contact large du côté qui s'applique contre le cylindre, en particulier avec de la vapeur.
EP02024064A 2001-11-24 2002-10-29 Appareil et procédé pour lisser une bande de papier ou de carton Expired - Fee Related EP1314818B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10157723 2001-11-24
DE10157723A DE10157723B4 (de) 2001-11-24 2001-11-24 Vorrichtung und Verfahren zum Glätten einer Papier- oder Kartonbahn

Publications (2)

Publication Number Publication Date
EP1314818A1 EP1314818A1 (fr) 2003-05-28
EP1314818B1 true EP1314818B1 (fr) 2005-04-27

Family

ID=7706871

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02024064A Expired - Fee Related EP1314818B1 (fr) 2001-11-24 2002-10-29 Appareil et procédé pour lisser une bande de papier ou de carton

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EP (1) EP1314818B1 (fr)
DE (2) DE10157723B4 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005054103A1 (de) * 2005-11-12 2007-05-16 Voith Patent Gmbh Glättanordnung
ATE520820T1 (de) * 2007-12-20 2011-09-15 Stora Enso Oyj Anordnung für die pressenpartie einer maschine zur herstellung einer materialbahn und in einer solchen anordnung hergestellter karton oder papier
DE102009045416A1 (de) * 2009-10-07 2011-04-14 Voith Patent Gmbh Pressanordnung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3920204A1 (de) * 1988-10-31 1990-05-10 Escher Wyss Gmbh Verfahren zum glaetten einer papier- oder kartonbahn
FI90366C (fi) * 1990-09-20 1994-01-25 Enso Gutzeit Oy Menetelmä ja laitteisto paperi- tai kartonkirainan kiillottamiseksi
US5524532A (en) * 1994-12-28 1996-06-11 Valmet Corporation Method and apparatus for calendering a paper or board web
FI115235B (fi) * 2000-02-11 2005-03-31 Metso Paper Inc Menetelmä ja laite kalanteroinnissa
FI20000927A0 (fi) * 2000-04-18 2000-04-18 Valmet Corp Menetelmä kartonkirainan kalanteroimiseksi

Also Published As

Publication number Publication date
DE10157723B4 (de) 2005-12-22
DE10157723A1 (de) 2003-06-12
DE50202893D1 (de) 2005-06-02
EP1314818A1 (fr) 2003-05-28

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