EP1314820B1 - Calandre pour le lissage d' une bande fibreuse - Google Patents

Calandre pour le lissage d' une bande fibreuse Download PDF

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Publication number
EP1314820B1
EP1314820B1 EP20020024342 EP02024342A EP1314820B1 EP 1314820 B1 EP1314820 B1 EP 1314820B1 EP 20020024342 EP20020024342 EP 20020024342 EP 02024342 A EP02024342 A EP 02024342A EP 1314820 B1 EP1314820 B1 EP 1314820B1
Authority
EP
European Patent Office
Prior art keywords
web
nip
belt
auxiliary belt
auxiliary
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 - Lifetime
Application number
EP20020024342
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German (de)
English (en)
Other versions
EP1314820A1 (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 Patent GmbH
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Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1314820A1 publication Critical patent/EP1314820A1/fr
Application granted granted Critical
Publication of EP1314820B1 publication Critical patent/EP1314820B1/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
    • D21G1/006—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 web of fibrous material with a nip, which is formed by a heated roller and a peripheral shroud strip, which is pressed by means of a support member assembly in a predetermined peripheral portion against the roller, wherein the web is passed through the nip wherein a thermally conductive auxiliary belt is guided between the web and the roller through the nip, which is guided after exiting the nip over a predetermined distance adjacent to the web.
  • Such a calender is out WO 98/44195 A1 known.
  • the material web is first passed through a nip formed by two hard, heatable rollers. Subsequently, the material web is passed through a soft nip, which is formed by two soft rolls.
  • a circumferential jacket band connects one hard roller to the corresponding soft roller.
  • This circumferential sheath band serves as a protection for the soft rolls, on the other hand, it covers the web between the two nips, so that after the first nip no sudden pressure equalization can take place from the web into the environment.
  • a cooling device can be provided between the nips, which cools at least one of the circumferential jacket strips.
  • a calender wherein a circulating metal strip with a heated roll forms a nip through which a paper web is guided.
  • the metal strip is pressed against the circumference of the heated roll by two soft rolls, which in turn have a support element arrangement. This results in the periphery of the heated roller five treatment zones for the paper web.
  • EP 0 586 482 B1 A similar device, which may also be referred to as a "shoe press", is off EP 0 586 482 B1 known.
  • This device is used in the known case for dewatering a paper web, ie the web runs between two felt belts through the nip. Due to the increased pressure in the nip, the water is displaced from the paper web and absorbed in the felts.
  • the nip of such a shoe press has the advantage over a nip formed between two rolls that the surface pressure is lower but the residence time of the web is higher. This ensures that the volume of the web does not decrease as much as in a nip formed between two rolls. It has therefore been attempted to use such shoe press also for smoothing the surface of the web, which attempts have not always been successful.
  • the invention has for its object to improve the surface quality of the web.
  • the support element assembly comprises a plurality of, in the circumferential direction of the roller successively arranged support shoes.
  • an improved smoothness is achieved at least on the side of the web facing the roll.
  • the heated roller adds heat to the web, which has a positive effect on the smoothness. From a certain temperature, the surface of the web is plasticized, so to speak, so that impresses the surface of the auxiliary belt on the surface of the web. By choosing the auxiliary belt, more precisely the design of the surface, so you can already take some influence on the surface quality of the web.
  • the auxiliary band also has another effect: if you let the web lie directly on the hot roller, then the web is lifted off the hot surface when leaving the nip.
  • the sheath band can be formed in different ways.
  • One possibility is the use of a relatively stiff shell, which is elastic enough to adapt to the curvature of the roll, but otherwise rotates virtually in the manner of a roller.
  • This jacket can be provided with discs on the front side.
  • Another possibility is the use of a less rigid band, which is guided via support rollers in one circulation, wherein the deflection rollers practically define a polygon. Such a band can also be relatively thin.
  • the support element arrangement has a plurality of support shoes arranged one behind the other in the circumferential direction of the roller, the web receives a series of pressure surges when it passes through the nip, in each case when it comes into a region between a support shoe and the roller. This further enhances the smoothing of the web.
  • a cooling device is arranged behind the nip, which acts on the auxiliary belt. You can thus shorten the distance over which the auxiliary band must be guided adjacent to the track.
  • the cooling means need only be able to lower the temperature of the web to such an extent that the vapor in the web can condense again.
  • the cooling device acts on the side of the auxiliary belt, which bears against the roller.
  • the cooling device thus acts as it were through the auxiliary belt. Since the auxiliary belt has good thermal conductivity, the heat that has been transferred from the roller to the web through the auxiliary belt can be transported in the reverse direction as it passes by the cooling device. This is a relatively easy way to cool the web through the auxiliary belt.
  • a heating device acting on the auxiliary belt is arranged in front of the nip.
  • the tape is cooled during or after leaving the nip, so that the moisture in the web can condense again. If the auxiliary band has then performed a circulation and wants to re-enter the nip, it has accordingly a relatively low temperature. By the heater can raise the temperature of the auxiliary belt, so that the smoothing result is improved.
  • the heating device acts on the web-facing side of the auxiliary belt.
  • the heat then does not have to penetrate the auxiliary band.
  • the heat losses are correspondingly lower, so that a larger amount of heat can be delivered to the web.
  • the auxiliary band is designed as a metal band, in particular steel band.
  • Metals usually have a good thermal conductivity, which pairs with a relatively high strength. This is the case in particular with a steel strip.
  • a material with the smallest possible thermal expansion coefficient should be chosen here.
  • the side of the web opposite the auxiliary belt is covered behind the nip by a band over a predetermined distance.
  • the web in the nip has a relatively high residence time, not only is the surface adjacent the hot roll heated, but the web as a whole assumes an elevated temperature, so that it can be assumed that the moisture in the entire interior of the web is in vapor is converted. If the web leaves the nip, then there is the risk that the steam exits there also on the side facing away from the roller of the web. This danger can be overcome by covering the other side of the web over a predetermined distance, with a vapor-impermeable belt so that the steam is trapped on both sides.
  • the band is formed by the cladding band. This is a relatively simple constructive solution. It is necessary to guide the sheath band after the nip only a certain distance so that the web is held between the sheath band and the auxiliary band. The extension of the sheath band can be carried out with relatively little effort.
  • the band is formed by a sheath auxiliary band, which is guided between the sheath band and the web through the nip.
  • the sheath auxiliary band With the aid of the sheath auxiliary band, it is possible to impart to the surface of the web facing the sheath band other properties, in particular with regard to smoothness, than would be possible with the surface of the sheath band.
  • the sheath auxiliary band may be formed by a steel band or other metal band with a very smooth surface, so that the smoothness of this surface is impressed on the web.
  • a second cooling device which acts on the band.
  • the second cooling device contributes to an even faster cooling of the web, so that the distance can be kept short, in which the tape rests against the web.
  • a steam application device is arranged in front of the nip, which applies steam to the side of the auxiliary belt facing the web and / or onto the web.
  • the vapor causes an increase in moisture and temperature, at least on the surface of the web. This has a positive effect on the smoothing of the surface of the web.
  • the smoothing discussed here can also be described as "satinage”.
  • a calender 1 for smoothing a web of fibrous material in particular a paper or board web (shown in phantom) has a heated roller 3, which is heated by means not shown, but known per se.
  • a heated roller 3 which is heated by means not shown, but known per se.
  • liquids such as water or oil, or steam can be used. Heating by radiation or electric or magnetic fields are also possible.
  • the roller 3 forms, together with a circumferential jacket band 4, a nip 5 which extends over almost half the circumference of the roller 3.
  • a series of support shoes 6 are along the circumferential direction of the roller 3 so arranged that they press the jacket strip 4 against the roller 3.
  • the support shoes have a convex pressure surface 7, the curvature of the curvature of the roller 3 is adapted.
  • Lubricants are provided in the pressure surface 7, for example, openings from which hydraulic oil can escape under pressure in order to form a lubricating film between the jacket band 4 and the support shoes 6.
  • the result of the support shoes 6 results in the nip 5 zones with higher pressure and zones with lower pressure, so that the web 2, when it passes through the nip 5, is impulsively pressurized.
  • an auxiliary belt 8 is guided, in the present case, a steel strip whose web 2 facing surface has a relatively high smoothness.
  • the smoothness is as great as the smoothness of a roller on which the web 2 would rest for smoothing.
  • the auxiliary belt 8 is well thermally conductive and, moreover, vapor-impermeable. The heat from the heated roller 3 can thus penetrate the web 2 practically unhindered.
  • the temperature of the heated roller 3 is greater than 100 ° C in operation, d. H. Moisture, which is in web 2, may evaporate due to the long residence time in nip 5.
  • the auxiliary belt 8 is guided after leaving the nip 5 so that it at the Lane 2 continues to lie.
  • the jacket tape 4 is after led out of the nip accordingly.
  • the sheath band 4 and the auxiliary belt 8 form after lifting from the circumference of the roller 3, a cooling zone 9, in which the sheath strip 4 from one side and the auxiliary belt 8 from the other side of the web 2 abut so that steam from the web. 2 can not escape.
  • a first cooling device 10 which acts on the auxiliary belt 8 and that from the side which bears against the roller 3.
  • a second cooling device 11 is provided, which acts on the cladding tape 4, and indeed also from the rear side thereof. Both cooling devices thus act through the corresponding bands 4, 8.
  • the web 2 After passing through the cooling zone 9, the web 2 has a temperature below the boiling point of the liquid contained therein, so that the moisture can condense again (usually below 100 ° C). This results in an advantageous effect that a moisture balance in the transverse direction, d. H. transverse to the direction 12 of the web 2 results.
  • Fig. 1 works particularly well when the cladding tape 4 is also formed good thermal conductivity. This is in some cases but not the case, for example, when the cladding band is formed of a plastic material having only a limited thermal conductivity.
  • the jacket strip 4 serves to prevent the escape of steam from the web 2 on the surface facing away from the roller 3.
  • the cooling takes place almost exclusively with the aid of the first cooling device 10.
  • Fig. 2 shows a way how both sides of the web 2 can be cooled after leaving the nip 5. Identical parts are provided with the same reference numerals as in Fig. 1.
  • a sheath auxiliary belt 13 is guided by the nip 5, which is arranged between the web 2 and the cladding tape 4.
  • the sheath auxiliary band 13 is also formed as a steel band, d. H. it has a fairly good thermal conductivity. It is held in contact with the web 2 in the cooling zone 9, so that the vapor from the web 2 after leaving the nip 5 can not escape.
  • the sheath auxiliary band 13 (represented by dashed lines, like the auxiliary band 8) makes it possible for the cooling device 11 to act on the web 2 with a high degree of effectiveness through the sheath auxiliary band 13.
  • the circulation of the cladding tape 4 is somewhat shorter in this case, ie the cladding tape 4 can already be returned again when the nip 5 is over.
  • the "shut-off function" is taken over by the sheath auxiliary belt 13.
  • the sheath auxiliary band 13 has a positive side effect. His the web 2 facing surface can be formed much smoother than the surface of the cladding tape 4 in the rule. If the web 2 has received the necessary high temperature in the nip, then the sheath auxiliary band 13 is able to the back, d. H. to smooth the not adjacent to the roller 3 side of the web 2. So one reaches a two-sided smoothing with a single pass through the nip. 5
  • auxiliary belt 8 which has been cooled by the cooling device 10, brought back to an elevated temperature, so that the smoothing of the web 2 can be improved.
  • a steam application device can also be provided which applies steam to the side of the auxiliary belt 8 facing the web 2 or to the web 2 itself.
  • a steam application device can also be provided which applies steam to the side of the auxiliary belt 8 facing the web 2 or to the web 2 itself.
  • the heater and the steam application device can also be combined.

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  • Paper (AREA)

Claims (11)

  1. Calandre (1) pour le lissage d'une nappe (2) de matière fibreuse comprenant une pince (5) formée par un rouleau chauffé (3) et une bande d'enveloppe périphérique (4), qui est pressée à l'aide d'un agencement d'éléments de support (6) dans une portion périphérique prédéterminée contre le rouleau (3), la nappe (2) étant guidée à travers la pince (5), une bande auxiliaire (8) thermoconductrice étant guidée entre la nappe (2) et le rouleau (3) à travers la pince (5), et étant guidée sur une distance (9) prédéterminée en appui contre la nappe (2) après sa sortie de la pince (5), caractérisée en ce que l'agencement d'éléments de support présente plusieurs sabots de support (6) disposés les uns derrière les autres dans la direction périphérique du rouleau (3).
  2. Calandre selon la revendication 1, caractérisée en ce qu'un dispositif de refroidissement (10) est disposé derrière la pince (5) et agit sur la bande auxiliaire (8).
  3. Calandre selon la revendication 2, caractérisée en ce que le dispositif de refroidissement (10) agit du côté de la bande auxiliaire (8) qui s'applique contre le rouleau (3).
  4. Calandre selon l'une quelconque des revendications 1 à 3, caractérisée en ce qu'un dispositif de chauffage agissant sur la bande auxiliaire (8) est disposé avant la pince (5).
  5. Calandre selon la revendication 4, caractérisée en ce que le dispositif de chauffage agit sur le côté de la bande auxiliaire (8) tourné vers la nappe (2).
  6. Calandre selon l'une quelconque des revendications 1 à 5, caractérisée en ce que la bande auxiliaire (8) est réalisée sous forme de bande métallique, notamment de bande d'acier.
  7. Calandre selon l'une quelconque des revendications 1 à 6, caractérisée en ce que le côté de la nappe (2) opposé à la bande auxiliaire (8) est recouvert derrière la pince (5) par une bande (4, 13) sur une distance prédéterminée.
  8. Calandre selon la revendication 7, caractérisée en ce que la bande est formée par la bande d'enveloppe (4).
  9. Calandre selon la revendication 7, caractérisée en ce que la bande est formée par une bande auxiliaire d'enveloppe (13) qui est guidée entre la bande d'enveloppe (4) et la nappe (2) à travers la pince (5).
  10. Calandre selon l'une quelconque des revendications 7 à 9, caractérisée en ce que l'on prévoit un deuxième dispositif de refroidissement (11) qui agit sur la bande (4, 13).
  11. Calandre selon l'une quelconque des revendications 1 à 10, caractérisée en ce que l'on dispose avant la pince (5) un dispositif d'application de vapeur qui applique de la vapeur sur le côté de la bande auxiliaire (8) tourné vers la nappe (2) et/ou sur la nappe (2).
EP20020024342 2001-11-24 2002-11-02 Calandre pour le lissage d' une bande fibreuse Expired - Lifetime EP1314820B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10157688 2001-11-24
DE2001157688 DE10157688C1 (de) 2001-11-24 2001-11-24 Kalander zum Glätten einer Bahn aus Faserstoff

Publications (2)

Publication Number Publication Date
EP1314820A1 EP1314820A1 (fr) 2003-05-28
EP1314820B1 true EP1314820B1 (fr) 2007-07-11

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EP20020024342 Expired - Lifetime EP1314820B1 (fr) 2001-11-24 2002-11-02 Calandre pour le lissage d' une bande fibreuse

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DE (2) DE10157688C1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI111282B (fi) * 2002-03-07 2003-06-30 Metso Paper Inc Kalanterointimenetelmä ja kalanteri
DE10237534A1 (de) * 2002-08-16 2004-02-26 Voith Paper Patent Gmbh Vorrichtung zur Herstellung einer Materialbahn
DE10357010A1 (de) * 2003-12-05 2005-06-30 Voith Paper Patent Gmbh Anordnung zum Glätten einer Faserstoffbahn
DE102006037358B4 (de) 2006-08-09 2008-09-25 Voith Patent Gmbh Kalanderanordnung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE468483B (sv) * 1991-05-24 1993-01-25 Nordiskafilt Ab Press samt saett att modifiera en press foer pressektionen i en pappersmaskin eller liknande
US5400707A (en) * 1992-10-09 1995-03-28 Champion International Corporation Apparatus for finishing a continuous sheet of paper
FI102305B (fi) * 1997-04-02 1998-11-13 Valmet Corp Kalanterointimenetelmä ja menetelmää soveltava kalanteri
DE19828156A1 (de) * 1998-06-24 1999-12-30 Voith Sulzer Papiertech Patent Vorrichtung zum Glätten einer Materialbahn
US6183601B1 (en) * 1999-02-03 2001-02-06 Kimberly-Clark Worldwide, Inc. Method of calendering a sheet material web carried by a fabric

Also Published As

Publication number Publication date
DE10157688C1 (de) 2003-02-13
EP1314820A1 (fr) 2003-05-28
DE50210447D1 (de) 2007-08-23

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