EP1369526B1 - Calandre et procédé de calandrage - Google Patents

Calandre et procédé de calandrage Download PDF

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Publication number
EP1369526B1
EP1369526B1 EP20030012360 EP03012360A EP1369526B1 EP 1369526 B1 EP1369526 B1 EP 1369526B1 EP 20030012360 EP20030012360 EP 20030012360 EP 03012360 A EP03012360 A EP 03012360A EP 1369526 B1 EP1369526 B1 EP 1369526B1
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EP
European Patent Office
Prior art keywords
arrangement according
shell
roll
extension element
pressure
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.)
Revoked
Application number
EP20030012360
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German (de)
English (en)
Other versions
EP1369526A1 (fr
Inventor
Jochen Autrata
Günter Bonk
Thomas Hermsen
Rüdiger KURTZ
Josef Schneid
Thomas Wöhner
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Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1369526A1 publication Critical patent/EP1369526A1/fr
Application granted granted Critical
Publication of EP1369526B1 publication Critical patent/EP1369526B1/fr
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
    • D21G1/006—Calenders; Smoothing apparatus with extended nips

Definitions

  • the invention relates to a calender arrangement with a shoe roll having a circumferential jacket, which is loadable by means of a pressure shoe in the direction of a counter-roller. Furthermore, the invention relates to a method for calendering a web in a nip formed between a circumferential shell and a counter roll, wherein the shell by means of a pressure shoe, which rests on the inside of the jacket, presses against the counter roll.
  • Such a calender arrangement and such a method are known for example from DE 299 02 436 U1, DE 299 02 451 U1 or DE 4322876A.
  • the shoe roll forms, together with the counter roll, a nip through which a material web, in particular a paper or board web, can be guided.
  • the coat of the chaff roller is relatively resilient, so that it adapts over a predetermined peripheral portion of the shape of the backing roll. This increases the length of the nip in the direction of movement.
  • Such a nip is also called "Breitnip".
  • the enlargement of the nip has the advantage that one can achieve a treatment time at the same web speed, which is longer in the nip than in a conventional nip, which is formed between two rollers. For the same force is applied, the compressive stress in the nip decreases, so that the compression of the material web is kept correspondingly smaller.
  • the jacket has the required flexibility, it is usually made of a plastic. In some cases, it is undesirable for the sheath to come in direct contact with the backing roll. This will be explained by the following example: Plastics are usually limited in their thermal load. If you heated the mating roll, then it must, in order to be able to feed the required amounts of heat in the nip, surface temperatures, which may well be greater than 200 ° C. This is not a problem as long as a web is passed through the nip. The web then separates the mating roll from the mantle.
  • the invention has for its object to prevent a system of the jacket on the counter roll.
  • the counter roll is heated. If one introduces heat into the broad nip via the counter-roller, then one can heat the material web, which likewise has a positive effect on the treatment of the material web, in particular the surface properties of a paper or board web.
  • the width of the support surface is variable in dependence on the width of a material web, which passes through a broad nip between the shell and the counter-roller.
  • a criterion is available, by means of which one can set the width of the support surface.
  • the change in the width of the support surface is a relatively simple measure, so that you can satiate without major alterations work one behind the other different webs of material.
  • the support surface preferably has a boundary that is movable in the direction parallel to the axis of the counter-roller.
  • the support surface may stop with the limitation in the sense that outside the limit, mechanical support is completely lacking. But you can also imagine that the support surface by a pressurized standing upholstery of a hydraulic fluid is formed. In this case, the limitation limits this pressure pad. If the boundary is moved, then the axial length of this pressure pad just gets bigger or smaller.
  • the boundary is formed by a transverse strip which is arranged between two sealing strips which extend parallel to the axis of the counter-roller.
  • the two sealing strips are arranged immovably in the direction of movement of the web in relation to the jacket. They define in the direction of movement of the material web the beginning and the end of a zone in which a pressurization takes place. The adjustment in the width direction then takes place by the movement of the sealing strip.
  • the transverse bar is displaceable in a space which is closed at the front side.
  • the frontal closure then forms a limit to the movement of the transverse bar.
  • the frontal termination connects the two sealing strips, which allows a particularly high mechanical stability.
  • the space has a pressure medium feed. Accordingly, the space can be pressurized. This pressure then forms a back pressure to the pressure prevailing in the support surface. Even if the pressure in the room is not the same, you can at least partially offset the forces on the cross bar. It is then easier to hold the cross bar at the desired position.
  • the cross bar may be provided in the manner of a U with two legs which are sealingly guided on the sealing strips.
  • the cross bar with the two legs then forms a kind of drawer, which can be moved between the sealing strips or outside the sealing strips in order to change the axial length of the support surface.
  • the sealing strips on a pressure application.
  • the sealing strips are thus pressed with a certain force from the inside against the jacket, so that at least in the axial direction, a seal between the sealing strips and the circumferential jacket can be achieved, which allows to build up the required pressure in the support surface.
  • the pressure device may be coupled to the cross bar, so that the sealing strips are pressed only in a region against the jacket, which is bounded by the transverse bar. Outside of this, the jacket can then move away from the backing roll, because it is no longer sufficiently supported by the sealing strips.
  • the pressure shoe is extensible on at least one axial end with an extension element.
  • an extension element is a relatively simple measure, so that you can take the disadvantage of no longer continuous extension or shortening in purchasing.
  • the extension element from a non-active position in which it has a distance from the jacket, is displaceable in an active position in which it rests on the inside of the jacket. So you can reach an extension or shortening of the pressure shoe simply by moving an extension element. However, the movement or displacement of an extension element is relatively easy to implement. Larger conversion measures are not required. In particular, it can be provided that a drive is provided for the displacement of the extension element, so that one can control the displacement from the outside.
  • the non-active position is disposed inside the shell.
  • the active position is arranged anyway in the interior of the shell. The displacement movement then takes place completely in the interior of the shell, so that one does not have to implement a passage through the shell or its end faces.
  • the extension element between the non-active and the active position is movable on a ramp. It is thus arranged in the interior of the shell to a carrier which is formed at predetermined portions ramp-shaped. If you now move an extension element along this ramp, then it continues to approach the mantle or it moves away from it. With the help of the ramp, the individual positions of the extension elements can be adjusted relatively easily. Due to the inclination of the ramp, it is also possible, with relatively small forces, to exercise the movement of the extension element along the ramp be able to generate correspondingly large forces in the direction of the counter roll when the extension element is in its active position. However, these forces are required in operation only as holding forces.
  • the ramp extends in the axial direction.
  • In the axial direction is usually sufficient space available. You can then let the drive act on the extension elements in the axial direction.
  • an extension element arranged axially further outwards has a longer foot than an extension element arranged axially further inwards. So you can order all the extension elements on the ramp. An axially further outward extension element is then moved over the correspondingly longer foot in the same radial position, such as an axially inner extension element.
  • the ramp is inclined relative to a direction which is perpendicular to a press plane through the nip between the shell and the counter roll.
  • the press plane is basically spanned by the axis of the counter roll and the central axis of the shell of the shoe roll.
  • the extension members are displaced parallel to a radial direction and thereby move up or down the ramp. This embodiment is advantageous if there is not enough space available in the axial direction.
  • each extension element has a lubrication.
  • the lubrication may be hydrodynamic.
  • the extension elements and the pressure shoe must be designed so that the lubricating oil adhering to the shell can form a lubricating film between the pressure shoe or the extension elements and the shell during the movement of the shell relative to the pressure shoe.
  • the extension elements then have in principle the same cross-sectional shape as the pressure shoe. If one provides a hydrostatic lubrication, then both the pressure shoe and the individual extension elements may each be provided with a pressure connection for the lubricant.
  • Each extension element can then have its own pressure pocket, via which the lubricant can be fed.
  • the pressure shoe and each extension element has a rounding on its axial outside. This will avoid damage to the jacket from the inside at the point where the support by the pressure shoe stops. Avoid a sharp edge, so that the life of the shell is extended.
  • each extension element has on its axial inner side a shape suitable for the rounding.
  • a shape suitable for the rounding One then obtains, as it were, a "seamless" surface of the pressure shoe.
  • the problem is solved in a method of the type mentioned above in that one depending on the width of the web changed the axial boundary of a support surface of the pressure shoe.
  • a pressure pocket which forms the support surface.
  • the pressure required for pressing the jacket against the mating roll by interposing the material web is applied by a hydraulic fluid. If this hydraulic fluid can act on the shell over a greater or lesser axial length, then the axial treatment length will also change.
  • the change in the width of the pressure pocket, more precisely its axial length, is relatively easy to carry out.
  • a calender arrangement 1 according to FIGS. 1 and 2 has a shoe roll 2 which forms a broad nip 4 with a counter roll 3, through which a material web 5, in the present example a paper or board web, can be guided, there with increased pressure and elevated temperature to be applied.
  • the counter roll 3 is provided with a heater 6 shown only schematically. The heating of the counter roll 3 can also be done in other ways, such as by feeding a hot liquid or steam.
  • the shoe roll 2 has a roll shell 7, which is pressed by means of a pressure shoe 8 in the direction of the counter roll 3.
  • the pressure shoe 8 has an Anpreßseite 9 with a curvature which is adapted to the curvature of the counter-roller 3.
  • the roll shell 7 of the shoe roll 2 is formed of a material which is sufficiently yielding that. the roll shell 7 is concavely deformed in the region of the pressure shoe 8, while it is convex in the remaining region of its circulation. Appropriately, the roll shell 7 is guided over non-illustrated support rollers in circulation.
  • the roll shell 7 is formed from an elastomeric plastic, which is only limited thermal load.
  • the counter roll 3 is heated to transfer a sufficient heat output to the web 5 so that their surface assumes a temperature in the range of 200 to 300 ° C. This temperature is too high for the roll shell 7. It is therefore necessary to ensure that the roll shell 7 does not touch the surface of the counter roll 3. This is uncritical in the areas where the web 5 passes through the nip 4. However, since the material web 5 may well be narrower than the sheath 7 of the shoe roll 2, measures are required to prevent contact of the roll shell 7 with the counter roll 3 outside the material web 5.
  • the pressure shoe 8 is here in its length, i. in the direction parallel to the axis 10 of the counter roll 3 changeable. Shown in solid lines is the pressure shoe 8, if it has a relatively short length. Shown dashed is the pressure shoe 8 with a greater length.
  • the roll shell 7 of the shoe roll 2 is held at its end faces by end disks 11, 12, which rotate on a carrier 13 shown schematically, which passes through the shoe roll 2, together with the roll shell 7.
  • These end disks 11, 12 have a predetermined distance to the counter roll 3. Accordingly, in the region of the axial ends, the roll shell 7 has the same distance to the counter roll 3.
  • the roll mantle 7 is raised and moved as far as the mating roll 3. So if the pressure shoe 8 is longer, then the roll shell 7 is applied over a larger axial area of the counter roll 3 (shown in phantom), as in a case where it is shorter (shown in solid). From the axial ends of the pressure shoe 8 of the roll shell then extends conically to the end plates 11, 12. In these conical regions of the roll shell 7 has a sufficient distance from the counter roll 3, so that thermal damage is no longer to be feared.
  • Figs. 3 and 4 a possibility is shown how to change the effective length of the pressure shoe 8.
  • Fig. 3 shows a schematic cross section through the pressure shoe 8.
  • Fig. 4 shows a plan view.
  • the pressure shoe 8 initially has two sealing strips 14, 15, which are arranged at the beginning and at the end of the broad nip 4 (seen in the running direction of the material web 5).
  • the two sealing strips 14, 15 are guided in guides 16, 17, i. they can move in the radial direction towards and away from the counter roll 3. Within the guides 16, 17, the sealing strips can be acted upon by the side facing away from the roll shell 7 with pressure, as indicated schematically by arrows 18.
  • the support surface 19 is limited by a transverse bar 21 which is displaceable in the direction of a double arrow 22 between the two sealing strips 14, 15.
  • the transverse strip 21 separates the support surface 19 from a space 23, which is closed by an end wall 24 which connects the two sealing strips 14, 15 with each other, the end face.
  • the space 23 may have a pressure medium feed, so that you can apply the cross bar 21 on both sides with pressure. This pressure will of course be greater in the area of the support surface 19, because one would like to avoid that the roll shell 7 in the area of the space 23 is also pressed against the counter roll 3. However, the pressure in the space 23 is sufficient to make the holding forces that would be required for holding the cross bar 21 in its adjusted position, not too large.
  • the cross bar 21 is moved by means of a drive 25 shown only schematically.
  • This drive 25 is controllable from the outside. It can be connected in a manner not shown with a sensor which determines the width of the web 5 and / or the position of its edges. Accordingly, the position of the cross bar 21 can be aligned so that the support surface 19 unfolds their effect so that the roll shell 7 is pressed only in the region of the web 5 against the backing roll 3, but otherwise remotely cone-shaped away from the backing roll 3.
  • Fig. 5 shows a modified embodiment in which the same and corresponding elements are provided with the same reference numerals.
  • the cross bar 21 is here provided with two legs 26, 27, which are arranged to the cross bar 21 in the manner of a U.
  • the two legs 26, 27 are sealed from the inside to the sealing strips 14, 15 at.
  • legs 26, 27 can also be arranged on the outside of the two sealing strips 14, 15.
  • FIGS. 6 to 9 While in the embodiment according to FIGS. 3 to 5, the support surface 19 is changed by moving a cross bar 21 in its axial length, this is done in the embodiment of FIGS. 6 to 9 by adding extension elements to the pressure shoe 8. This is schematically in Fig. 6 shown. There are so many extension elements 28 added to the pressure shoe 8, that the roll shell 7 is pressed in the region of the material web 5 against the counter roll 3.
  • Fig. 7 shows the pressure shoe 8, which ends at its axial end after a step in a ramp 29.
  • the ramp 29 extends parallel to the direction of the axis 10 of the counter roll 3.
  • a guide 30 is arranged, for example in the manner of a hammer head or dovetail guide.
  • extension element 28 is displaceable from an inactive position I to an active position A.
  • the extension element 28 is simply pushed up the ramp 29 and indeed until the extension element 28 comes to bear against an end face 31 of the pressure shoe 8. There, the extension element 28 can then be determined by means not shown.
  • An extension element 28 ' can also be moved up the ramp 29.
  • the extension member 28' In order for this extension member 28 'to terminate at the same radial extent as the extension member 28, the extension member 28' has a longer "foot" 32 than the extension member 28.
  • the extension of the foot 32 compensates for the difference in height due to the different axial positions the extension elements 28, 28 'on the ramp 29 is conditional.
  • All extension elements 28, 28 ' are arranged within the roll shell 7.
  • the displacement takes place by means of a drive, not shown, which drives the extension elements 28, 28 'mainly in the axial direction.
  • the movement in the radial direction then takes place under the action of the ramp 29.
  • Fig. 8 shows a modified embodiment in which the ramp 30 'is inclined in a direction which is rotated 90 ° to the direction of the ramp of Fig. 7.
  • the ramp 30 'of Figure 8 is inclined to a plane perpendicular to a plane of the press, i.
  • the extension member 28 so far raise that it comes into coincidence with the cross-sectional area of the pressure shoe 8, ie can also act on the jacket 7.
  • the extension member 28 is inactive.
  • FIG. 9 now shows that both the pressure shoe 8 and the extension elements 28, 28 'have a rounding 33 at their axially outer end.
  • This rounding 33 is favorable, because the jacket is bent at this point and a sharp edge would bring the risk of damage.
  • the extension elements 28, 28 ' have on their axial inner side a corresponding counter-rounding 34, which coincides with the rounding 33, so that one can reach a contact of the extension elements 28, 28' on the pressure shoe 8 and the adjacent extension element 28.

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Claims (22)

  1. Système de calandre (1) avec un cylindre formant sabot (2) qui présente une enveloppe périphérique (7), qui peut être sollicitée à l'aide d'un sabot de pressage (8) dans la direction d'un cylindre conjugué (3), caractérisé en ce que le sabot de pressage (8) présente une surface de support (19) dont la largeur peut être modifiée dans une direction parallèle à l'axe (10) du cylindre conjugué (3).
  2. Système selon la revendication 1, caractérisé en ce que le cylindre conjugué (3) est chauffé.
  3. Système selon la revendication 1 ou 2, caractérisé en ce que la largeur de la surface de support (19) peut être modifiée en fonction de la largeur d'une bande de matériau (5), qui passe à travers une pince allongée (4) entre l'enveloppe (7) et le cylindre conjugué (3).
  4. Système selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la surface de support (19) présente une délimitation (21) mobile dans la direction parallèle à l'axe (10) du cylindre conjugué (3).
  5. Système selon la revendication 4, caractérisé en ce que la délimitation (21) est formée par une nervure transversale qui est disposée entre deux nervures d'étanchéité (14, 15) qui s'étendent parallèlement à l'axe (10) du cylindre conjugué (3).
  6. Système selon la revendication 4 ou 5, caractérisé en ce que la nervure transversale peut être déplacée dans un espace (23) qui est fermé du côté frontal.
  7. Système selon la revendication 6, caractérisé en ce que l'espace (23) présente une alimentation en fluide sous pression.
  8. Système selon la revendication 5, caractérisé en ce que la nervure transversale (21) est pourvue de deux branches (26, 27) à la manière d'un U, lesquelles sont guidées hermétiquement contre les nervures d'étanchéité (14, 15).
  9. Système selon l'une quelconque des revendications 5 à 8, caractérisé en ce que les nervures d'étanchéité (14, 15) présentent un système de pression (18).
  10. Système selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le sabot de pressage (8) peut être prolongé au moins au niveau d'une extrémité axiale par un élément de prolongation (28, 28').
  11. Système selon la revendication 10, caractérisé en ce que l'élément de prolongation (28, 28') peut être déplacé d'une position inactive (I) dans laquelle il est espacé de l'enveloppe (7), dans une position active (A) dans laquelle il s'applique par l'intérieur contre l'enveloppe (7).
  12. Système selon la revendication 11, caractérisé en ce que la position inactive (I) est disposée à l'intérieur de l'enveloppe (7).
  13. Système selon la revendication 11 ou 12, caractérisé en ce que l'élément de prolongation (28, 28') peut être déplacé sur une rampe (30, 30') entre la position inactive (I) et la position active (A).
  14. Système selon la revendication 13, caractérisé en ce que la rampe (30) s'étend dans la direction axiale.
  15. Système selon la revendication 14, caractérisé en ce qu'un élément de prolongation (28') disposé axialement plus vers l'extérieur présente une base plus longue (32) qu'un élément de prolongation (28) disposé axialement plus vers l'intérieur.
  16. Système selon la revendication 13, caractérisé en ce que la rampe (30') est inclinée par rapport à une direction qui est perpendiculaire à un plan de presse traversant la pince allongée (4) entre l'enveloppe (7) et le cylindre conjugué (3).
  17. Système selon l'une quelconque des revendications 10 à 16, caractérisé en ce que chaque élément de prolongation (28, 28') présente une lubrification.
  18. Système selon l'une quelconque des revendications 10 à 17, caractérisé en ce que le sabot de pressage (8) et chaque élément de prolongation (28, 28') présente un arrondi (33) au niveau de son côté axialement externe.
  19. Système selon la revendication 18, caractérisé en ce que chaque élément de prolongation (28, 28') présente sur son côté axialement interne une formation (34) adaptée à l'arrondi (33).
  20. Procédé de satinage d'une bande de matériau dans une pince allongée, qui est formée entre une enveloppe périphérique et un cylindre conjugué, l'enveloppe étant pressée contre le cylindre conjugué à l'aide d'un sabot de pressage qui s'applique de l'intérieur contre l'enveloppe, caractérisé en ce que l'on modifie la délimitation axiale d'une surface de support du sabot de pressage en fonction de la largeur de la bande de matériau.
  21. Procédé selon la revendication 20, caractérisé en ce que l'on modifie la largeur d'une poche de pression qui forme la surface de support.
  22. Procédé selon la revendication 20 ou 21, caractérisé en ce que l'on modifie la longueur axiale du sabot de pressage par apport ou enlèvement d'éléments de prolongation.
EP20030012360 2002-06-07 2003-05-30 Calandre et procédé de calandrage Revoked EP1369526B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10225255 2002-06-07
DE2002125255 DE10225255B3 (de) 2002-06-07 2002-06-07 Kalanderanordnung und Verfahren zum Satinieren einer Materialbahn

Publications (2)

Publication Number Publication Date
EP1369526A1 EP1369526A1 (fr) 2003-12-10
EP1369526B1 true EP1369526B1 (fr) 2006-11-22

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ID=29432689

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Application Number Title Priority Date Filing Date
EP20030012360 Revoked EP1369526B1 (fr) 2002-06-07 2003-05-30 Calandre et procédé de calandrage

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EP (1) EP1369526B1 (fr)
DE (2) DE10225255B3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007060400B3 (de) * 2007-12-14 2009-05-28 Andritz Küsters Gmbh Vorrichtung zum Bilden eines Langspalts

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI117057B (fi) * 2000-01-13 2006-05-31 Metso Paper Inc Menetelmä paperirainan puristamiseksi ja paperirainan puristuslaite
DE10336231A1 (de) * 2003-08-07 2005-03-03 Voith Paper Patent Gmbh Vorrichtung zur Behandlung einer Materialbahn
DE102004023124A1 (de) * 2004-05-11 2005-12-08 Voith Paper Patent Gmbh Breitnip-Kalander
DE102010030327A1 (de) * 2010-06-22 2011-12-22 Voith Patent Gmbh Bahnbehandlungsvorrichtung zum Glätten einer Faserstoffbahn

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4322876A1 (de) * 1993-07-09 1993-11-18 Voith Gmbh J M Vorrichtung zum Glätten einer Papierbahn oder Kartonbahn
SE9804347D0 (sv) * 1998-12-16 1998-12-16 Valmet Corp Method and apparatus for calendering paper
SE9804346D0 (sv) * 1998-12-16 1998-12-16 Valmet Corp Method and apparatus for calendering paper
FI990122A (fi) * 1999-01-22 2000-07-23 Valmet Karlstad Ab Kenkätela
FI117057B (fi) 2000-01-13 2006-05-31 Metso Paper Inc Menetelmä paperirainan puristamiseksi ja paperirainan puristuslaite

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007060400B3 (de) * 2007-12-14 2009-05-28 Andritz Küsters Gmbh Vorrichtung zum Bilden eines Langspalts
EP2071075A1 (fr) 2007-12-14 2009-06-17 Andritz Küsters GmbH Dispositif de formation d'une pince élargie

Also Published As

Publication number Publication date
EP1369526A1 (fr) 2003-12-10
DE50305730D1 (de) 2007-01-04
DE10225255B3 (de) 2004-01-08

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