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EP2275601B1 - Calandre pour lisser un papier ou une bande de carton - Google Patents

Calandre pour lisser un papier ou une bande de carton Download PDF

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Publication number
EP2275601B1
EP2275601B1 EP09008728A EP09008728A EP2275601B1 EP 2275601 B1 EP2275601 B1 EP 2275601B1 EP 09008728 A EP09008728 A EP 09008728A EP 09008728 A EP09008728 A EP 09008728A EP 2275601 B1 EP2275601 B1 EP 2275601B1
Authority
EP
European Patent Office
Prior art keywords
calender
nip
paper
treatment
web
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.)
Not-in-force
Application number
EP09008728A
Other languages
German (de)
English (en)
Other versions
EP2275601A1 (fr
Inventor
Peter Dr. Svenka
Bernhard Dr. Brendel
Eduard Dr. Davydenko
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 Kuesters GmbH
Original Assignee
Andritz Kuesters 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 Andritz Kuesters GmbH filed Critical Andritz Kuesters GmbH
Priority to AT09008728T priority Critical patent/ATE540159T1/de
Priority to EP09008728A priority patent/EP2275601B1/fr
Priority to PL09008728T priority patent/PL2275601T3/pl
Publication of EP2275601A1 publication Critical patent/EP2275601A1/fr
Application granted granted Critical
Publication of EP2275601B1 publication Critical patent/EP2275601B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0066—Calenders; Smoothing apparatus using a special calendering belt

Definitions

  • the invention relates to a calender for smoothing a paper or board web according to the preamble of claim 1.
  • a calender and a method for calendering are known in which two wide nips formed with circumferential bands are interrupted by at least one shorter nip.
  • the shorter nip is pressurized usually higher applied.
  • the first wide nip essentially serves to supply heat.
  • the short press nip causes a smoothing pulse on the web.
  • the second wide nip serves to even out the smoothness effect simultaneous cooling of the web.
  • Preference is given to a metal strip, which should be advantageous for the entry of heat because of the high thermal conductivity.
  • the application of high temperatures of up to 300 ° C is provided, and this applies in particular to the first wide nip. The disadvantages of high temperatures must therefore be accepted.
  • Object of the present invention is to provide a calender, the cost of a paper or board web and energy-saving smoothes.
  • a calender in which the paper or board web passes through a pretreatment section before entering the nip and the spring material of the circulating belt supports the generation of an optimized temperature profile in the paper or board web.
  • An optimized temperature profile enables a cost and energy-saving smoothing of the paper or board web in the nip.
  • Prolonged and spring-assisted heating of the paper or board web in the treatment nip improves uniform heating of the paper or board web to the technologically required depth.
  • Roll surface temperatures in the range of 80 ° C to 160 ° C are then generally sufficient. The amount of temperature will be in favor of lengthening the period of time Temperature effect with elastic contact protection between cardboard or paper web and heated roller reduced.
  • the reduction in the height of the temperature for the thermal-mechanical smoothing process is then only essentially determined by the plasticizing temperature of the fibrous materials used in a paper or board web and their moisture content.
  • the elastic thickness range of the band thereby ensures a resilient contact pressure and thus a uniform heat transfer from the heated roller to the paper or board web safely. For example, air cushions from unevenness of the paper or board web, which could hinder the heat transfer, are reliably reduced.
  • the roll surface temperature of the heated rolls need only be selected to be slightly higher than the plasticizing temperature of the respective paper or board web at a selectable moisture content. For example, it is possible to smooth out with a roller surface temperature which is only about 10 to 30 ° C. higher. Increasing the smoothness effect on soft calenders, multinip calenders and calenders with extended nips is possible.
  • the resulting energy savings result from reduced heat radiation and reduced forced convection.
  • the heat loss can be further reduced if the circulating belt has a closed surface cover on the side facing the paper or board web.
  • the thermally sealing and shielding effect of the circulating belt on the paper or board web in the treatment nip is increased.
  • a further increase can be achieved by the material of the elastic surface, which can act as a thermal insulator.
  • this material preferably has a low thermal conductivity.
  • One required to achieve the desired depth of penetration of the heat Dwell time in the treatment gap can be optimized by adjusting the Anpressplicin the tape to the circumference of the heatable roll by means of guide rollers.
  • the counter-element forming the nip is preferably arranged directly behind the treatment gap on the heatable roller. Preference is given to the use of a bending adjustment roller for simultaneous control of the property profiles of the web in the transverse direction.
  • the counter-element may be a soft roller or a hard heatable roller if bilateral smoothing is desired.
  • the line load can be adapted to the respective objective.
  • the calender may have one or more nips, wherein with several nips the treatment gap is preferably arranged upstream of the first nip.
  • a controlled local increase in pressure can be adjusted in the treatment gap by guide rollers for the circulating belt additionally work as pressure rollers.
  • Fig. 1 shows a calender 1 for smoothing a paper or board web 2 with at least one nip 3, which is formed between a heatable roller 4 and a counter element 5.
  • the counter element 5 is preferably a roller, in particular a Biegeeinstellwalze, for simultaneous control of the property profiles of the web 2 in the transverse direction.
  • the counter element 5 is preferably a soft roller.
  • the counter element 5 is formed as a hard roller, which is then preferably heated in order to smooth the paper or board web 2 on both sides.
  • the nip length of the nip 3 is preferably in the range of 1 to 40 mm, depending on the nature of the counter element 5, for example hard roller, soft roller or shoe roller. When using a shoe roll, the nip 3 may preferably have nip lengths in the range of 20 to 300 mm.
  • the roll 4 as well as the counter element 5 can each be driven, in particular for the online operation of the calender 1.
  • the heatable roll 4 is heated, for example, to roll surface temperatures of 80 ° C to 160 ° C depending on the plasticizing temperature of the respective paper or Cardboard web 2 and its moisture content.
  • the calender 1 comprises a device 6 for generating a predetermined pressure in the nip 3.
  • the device 6 for generating a predetermined pressure is here for example a loading cylinder.
  • the counter element 5 may be formed with an inner stroke, whereby a pressure load in the nip 3 is adjustable.
  • the nip 3 is in the web running direction L, a web treatment device 7 with two treatment gap 8 forming contact surfaces 9, 10 upstream.
  • the contact surface 9 is a circumferential contact surface, which is formed by a belt 14 circulating on guide rollers 11, 12, 13.
  • the other contact surface 10 is formed by the circumferential outer wall of the heatable roller 4.
  • the treatment gap 8 extends along a degree 15 of the wrapping of the heatable roller 4.
  • the degree 15 of the wrap for varying the length of the treatment gap 8 is adjustable depending on a desired penetration depth of the heat into the paper or board web 2.
  • the circulating belt 14 has an elastic thickness region 17 on the side facing the paper or board web 2 in order to optimize the thermal efficiency of the heat transfer from the heatable roll 4 to the paper or board web 2.
  • the elastic thickness region 17 has a spring rate which is smaller than the spring rate of the paper or board web 2 at the beginning of the treatment in the treatment gap 8.
  • the elastic thickness region 17 is preferably formed by an elastic layer which is arranged on a carrier material 19 of the belt 14.
  • the elastic layer thus forms, for example, a support.
  • the elastic thickness region 17 is preferably made of an elastomer, on the thickness and hardness of which the spring rate thereof is adjustable.
  • the spring rate of the paper or board web 2 at the beginning of the treatment in the treatment gap is 0.01 to 1 MPa / ⁇ m, preferably 0.1 to 0.5 MPa / ⁇ m.
  • the spring rate of the elastic thickness region 17 is preferably also in a range of 0.01 to 1 MPa / ⁇ m. In relation to the spring rate of the paper or board web 2 at the beginning of the treatment in the treatment gap 8, however, this spring rate of the elastic thickness range 17 is chosen to be smaller, in particular preferably at least 10% smaller.
  • the guide rollers 11, 12, 13 control a belt tension of the circulating belt 14 for pressurizing in the treatment gap 8.
  • the contact pressure in the treatment gap 8 is adjusted by the tension of the belt 14.
  • the maximum tensile stress of the belt 14 is limited to preferably 200 kN / m.
  • the compressive stress which can be achieved in the pretreatment zone of the treatment gap 8 can, for example, assume a value in the range from 0.01 MPa to 0.5 MPa. This depends on the belt tension and the dimensions of the heatable roller 4.
  • the web 2 Before entering the treatment gap 8, the web 2 can wrap around the heatable roller 4 along a partial section.
  • the surface temperature of the heatable roller 4 is preferably controlled so that within the residence time of the web 2 below the belt 14, the glass transition temperature is achieved in an optimum for the respective objective of the smoothing process penetration depth. For a volume-smoothing smoothing is often a penetration depth of about 10 microns sufficient.
  • the surface temperature and the length of the pretreatment path of the treatment nip 8 are optimized to allow operation at a temperature that does not significantly exceed the glass transition temperature of the surface area of the web 2 to be plasticized.
  • the thus pretreated web 2, which can be moistened before the calender 1 beforehand with nozzle and / or steam humidifier, is smoothed directly behind the pretreatment section in the nip 3, in particular a soft or hard nip.
  • the counter element 5 is a roller, its diameter is preferably less than or equal to 90% of the diameter of the heatable roller 4. In this way, the distance between the end of the treatment gap 8 and the inlet into the nip 3 should be kept as small as possible.
  • the circulating belt 14 has an elastic thickness region 17 for ensuring a uniform contact pressure, which is adjustable by the tension of the belt 14.
  • the circulating belt 14 on the paper or board web 2 side facing a closed surface cover.
  • the emanating from the heated roller 4 heat transfer to the paper or board web 2 is formed by the so-formed circumferential band 14 against the environment in the treatment gap 8 thermally shielded.
  • the introduction of heat into the paper or board web 2 is improved because heat dissipation to the environment is reduced.
  • the elastic thickness region 17 with closed surface cover 21 forms a thermal insulator which further improves the introduction of the heat into the paper or board web 2.
  • the elastic thickness region 17 of the circulating belt 14 preferably consists of a material with a thermal conductivity of less than or equal to 10 W / mK, in particular less than or equal to 5 W / mK, very preferably less than or equal to 1 W / mK.
  • the hardness of the elastic thickness range 17 is in the range of 50 Shore A to 92 Shore D.
  • the height of the elastic thickness range 17 is preferably 1 to 18 mm.
  • the overall height (thickness) of the band 14 is preferably in a range of 4 to 30 mm.
  • the band 14 preferably comprises a flat substrate 19 provided with one or more elastic layers.
  • support material 19 high-strength plastic fibers, glass fibers or carbon fibers can be used. Such a composite material has a high tensile strength.
  • a support fabric or support band may be incorporated from the aforementioned fibers.
  • the circulating belt 14 may further consist of a carrier material 19 provided with an elastic thickness region 17, wherein the carrier material 19 may also consist of a metal mesh or metal strip.
  • the roughness of the surface of the belt 14 is preferably in the range of 0.5 to 5 microns. The then given smoothness of the surface of the belt 14 may be reflected as smoothness on the paper or board web 2.
  • the tape 14 further includes, for example, a heat-resistant surface coating, such as silicone.
  • a heat-resistant surface coating such as silicone.
  • the heat-resistant coating provides high wear resistance and a smooth surface.
  • the circulating belt 14 further preferably has only a small elongation which is less than or equal to 7%. The strain occurring when adjusting the belt tension in the belt 14 due to tension in the belt 14 then does not disturb the smoothing.
  • the band 14 has at least the same width as the web 2. The thickness of the band 14 depends on its width and length and may be between 4 and 20 mm.
  • At least one of the guide rollers 12 has a device 16 for selectively tensioning the belt 14.
  • the guide roller 12 for tensioning the belt 14 is in each case displaceably or pivotably mounted on the end by means of a guide 18.
  • Fig. 1 shows as a guide 18 a lever system. On the lever system acts a drive element 20, which is associated with a not shown path measuring device.
  • At least one of the guide rollers 11, 13 may be formed as a pressure roller, which presses the web 14 in the treatment gap 8 along a portion in the direction L by additional radial local pressure load.
  • a guide roller 11, 13 is preferably formed on the inlet and / or outlet side of the treatment gap 8 as a pressure roller.
  • the radial pressure load can be set lower on the inlet side than the outlet side or vice versa.
  • Such a pressure roller may be a Biegeeinstellwalze.
  • Fig. 1 shows a calender 1, in which the band 14, the heatable hard roller 4 wraps more than 180 °.
  • the degree 15 of the wrap is at values between 90 ° and 270 °, with the values greater than or equal to 120 ° being particularly preferred.
  • the circulating, endless belt 14, which is also referred to as belt, is guided by three guide rollers 11, 12, 13 in a loop around the heatable roller 4.
  • the belt 14 is tensioned here by the guide roller 12.
  • the contact pressure of the belt 14 is determined to the web 2.
  • a higher tension of the belt 14 also results in a higher contact pressure of the web 2 and favors the leveling of the web surface, ie the pre-smoothing.
  • the pretreatment route the treatment gap 8 then serves in particular also a pre-smoothing of the web 2.
  • the path 2 conditioned in the treatment gap 8 is then finally finished in a nip 3 immediately following and formed with the same heatable roller 4.
  • the line load in nip 3 can be adapted to the smoothness effects to be achieved.
  • Medium compressive stresses with paper or cardboard in the nip 3 of 2 N / mm 2 to 55 N / mm 2 are adjustable.
  • the compressive stresses in the lower area of said area are used for thickness correction in cardboard.
  • the compressive stresses in the upper area of said range allow the smoothing of high-quality papers, such as SC, LWC and MWC papers or wood-free coated papers.
  • the temperature of the heated roller 4 and the length of the treatment section formed under the belt 14 are adjusted so that substantially only the near-surface region of the web 2 is heated, a conditioning section is formed, in which the interior of the web 2 below the plastification or Glass transition temperature remains. As a result, a volume-smoothing smoothing is possible.
  • the thickness of the near-surface layer of the paper or board web 2, which is brought above the plasticizing temperature, is several times the largest unevenness of the paper or board web surface. The thickness of the web layer to be heated is thus dependent on the roughness of the paper or board web 2 to be treated.
  • the length of the treatment gap 8 and the speed of the paper or board web 2 in the direction of travel L determine the residence time of the web 2 in the treatment gap 8 and thus also the Penetration depth of the heat in the web 2 and the layer thickness, which is heated to a deformation temperature.
  • the Kalander 1 can be operated online or offline.
  • Fig. 2 shows a multi-pin calender for smoothing high quality papers.
  • the treatment gap 8 is then preferably provided in front of the first nip.
  • the degree of wrap 15 and the applied contact pressure can also be varied here.
  • the applied contact pressure is determined by means of the belt tension with the aid of at least one adjustable guide roller 12. This makes it possible to adapt to different pulp materials and the types of treatment.
  • the web 2 can be applied to the outer surface of the heatable roller 4 before the treatment gap 8.
  • the roll stack may also have a soft alternating gap for a side smoothing a web. 2
  • the two-sided guides of a control roller can be controlled via a transversely provided to the direction of the tape sensor device to each other for a straight line of the tape be alignable.
  • the sensor device detects the position of the belt 14 toward the center of the heatable roller 4.

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  • Paper (AREA)

Claims (15)

  1. Calandre (1) destinée au lissage d'une bande (2) de papier ou de carton, comportant au moins une ligne (3) de contact réalisée entre un rouleau chauffant (4) et un contre-élément (5), un dispositif (6) destiné à produire une pression prédéterminée dans la ligne (3) de contact et un dispositif (7) de traitement de bande disposé en amont de la ligne (3) de contact présentant deux surfaces (9, 10) de contact formant une fente (8) de traitement, dont l'une de ces surfaces de contact (9, 10) est une surface (9) de contact tournante formée par une bande tournante (14) sur des rouleaux (11, 12, 13) de guidage, l'autre surface (10) de contact est formée par la paroi extérieure tournante du rouleau chauffant (4) et la fente (8) de traitement s'étend le long d'un secteur (15) de l'enroulement du rouleau chauffant (4), caractérisée en ce que la bande tournante (14) comprend une zone d'épaisseur élastique (17) sur le côté orienté vers la bande (2) de papier ou de carton, ladite plage d'épaisseur élastique (17) ayant une dureté de l'ordre de 50 Shore A à 92 Shore D, et dont le coefficient ressort est inférieur au coefficient ressort de la bande (2) de papier ou de carton au début du traitement dans la fente (8) de traitement.
  2. Calandre (1) selon la revendication 1, caractérisée en ce que la zone d'épaisseur élastique (17) est formée par une couche élastique disposée sur un matériau support (19) de la bande (14).
  3. Calandre (1) selon la revendication 1 ou la revendication 2, caractérisée en ce que la plage d'épaisseur élastique (17) est à base d'élastomère et en ce que le coefficient ressort de ladite zone d'épaisseur élastique (17) est réglable au-delà de l'épaisseur et de la dureté de cette dernière.
  4. Calandre (1) selon l'une des revendications 1 à 3, caractérisée en ce que le coefficient ressort de la zone d'épaisseur élastique (17) est compris entre 0, 01 et 1 MPa/µm.
  5. Calandre (1) selon l'une des revendications 1 à 4, caractérisée en ce que le coefficient ressort de la zone d'épaisseur élastique (17) est inférieur d'au moins 10% au coefficient ressort de la bande (2) de papier ou de carton.
  6. Calandre (1) selon l'une des revendications 1 à 5, caractérisée en ce que la bande tournante (14) comprend une zone d'épaisseur élastique (17) à base de matière plastique.
  7. Calandre (1) selon l'une des revendications 1 à 6, caractérisée en ce que les rouleaux (11, 12, 13) de guidage contrôlent la tension de la bande tournante (14) pour l'application d'une pression dans la fente (8) de traitement.
  8. Calandre (1) selon l'une des revendications 1 à 7, caractérisée en ce que la bande tournante (14) possède une surface de recouvrement (21) fermée sur le côté orienté vers la bande (2) de papier ou de carton.
  9. Calandre (1) selon l'une des revendications 1 à 8, caractérisée en ce que la zone d'épaisseur élastique (17) est à base d'un matériau ayant une conductivité thermique inférieure ou égale à 10 W/mk.
  10. Calandre (1) selon l'une des revendications 1 à 9, caractérisée en ce que le secteur (15) de l'enroulement destiné au réglage de la longueur de la fente (8) de traitement est réglable en fonction d'une profondeur de pénétration de la chaleur dans la bande (2) de papier ou de carton.
  11. Calandre (1) selon l'une des revendications 1 à 10, caractérisée en ce qu'au moins un des rouleaux (11, 12, 13) de guidage comprend un dispositif (6) pour serrer la bande (14) de façon réglable.
  12. Calandre (1) selon l'une des revendications 1 à 11, caractérisée en ce qu'au moins un rouleau (11, 13) de guidage est réalisé en tant que rouleau de pression qui presse la bande dans la fente (8) de traitement le long d'une section dans le sens de passage par le biais de l'application d'une pression radiale et locale supplémentaire.
  13. Calandre (1) selon l'une des revendications 1 à 12, caractérisée en ce que la calandre (1) est une calandre à lignes de contact multiple où la fente (8) de traitement est prévue en amont de la première ligne (3) de contact.
  14. Calandre (1) selon l'une des revendications 1 à 13, caractérisée en ce que la ligne (3) de contact est une ligne de contact souple ou rigide ayant une longueur de ligne de contact de l'ordre de 1 à 40 mm.
  15. Calandre (1) selon l'une des revendications 1 à 14, caractérisée en ce que la ligne (3) de contact est formée par un rouleau à sabot et possède une longueur de ligne de contact de l'ordre de 20 à 300 mm.
EP09008728A 2009-07-03 2009-07-03 Calandre pour lisser un papier ou une bande de carton Not-in-force EP2275601B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT09008728T ATE540159T1 (de) 2009-07-03 2009-07-03 Kalander zum glätten einer papier oder kartonbahn
EP09008728A EP2275601B1 (fr) 2009-07-03 2009-07-03 Calandre pour lisser un papier ou une bande de carton
PL09008728T PL2275601T3 (pl) 2009-07-03 2009-07-03 Kalander do wygładzania wstęgi papieru albo kartonu

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09008728A EP2275601B1 (fr) 2009-07-03 2009-07-03 Calandre pour lisser un papier ou une bande de carton

Publications (2)

Publication Number Publication Date
EP2275601A1 EP2275601A1 (fr) 2011-01-19
EP2275601B1 true EP2275601B1 (fr) 2012-01-04

Family

ID=43243061

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09008728A Not-in-force EP2275601B1 (fr) 2009-07-03 2009-07-03 Calandre pour lisser un papier ou une bande de carton

Country Status (3)

Country Link
EP (1) EP2275601B1 (fr)
AT (1) ATE540159T1 (fr)
PL (1) PL2275601T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010002819A1 (de) * 2010-03-12 2011-09-15 Voith Patent Gmbh Satinageanordnung und Verfahren zur Satinage
DE102012209736A1 (de) * 2012-06-11 2013-12-12 Voith Patent Gmbh Kalander
DE102015200380A1 (de) * 2015-01-14 2016-07-14 Voith Patent Gmbh Band für eine Glättvorrichtung, Glättvorrichtung und Verfahren zur Glättung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE502960C2 (sv) * 1994-06-15 1996-02-26 Nordiskafilt Ab Albany Arrangemang för kalandrering
AU9127698A (en) * 1997-10-31 1999-05-24 Beloit Technologies, Inc. Soft nip calender
DE102007024581A1 (de) 2007-05-25 2008-11-27 Voith Patent Gmbh Kalander und Verfahren zur Satinage von Papier- oder Kartonbahnen

Also Published As

Publication number Publication date
ATE540159T1 (de) 2012-01-15
EP2275601A1 (fr) 2011-01-19
PL2275601T3 (pl) 2012-06-29

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