EP1609907B1 - Calandre à pincage prolongée et procédé de satinage d' une bande de matériau - Google Patents

Calandre à pincage prolongée et procédé de satinage d' une bande de matériau Download PDF

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Publication number
EP1609907B1
EP1609907B1 EP05104597A EP05104597A EP1609907B1 EP 1609907 B1 EP1609907 B1 EP 1609907B1 EP 05104597 A EP05104597 A EP 05104597A EP 05104597 A EP05104597 A EP 05104597A EP 1609907 B1 EP1609907 B1 EP 1609907B1
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EP
European Patent Office
Prior art keywords
shell
extended nip
nip calender
thinning
compensating means
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Application number
EP05104597A
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German (de)
English (en)
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EP1609907A1 (fr
Inventor
Jörg Rheims
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP1609907A1 publication Critical patent/EP1609907A1/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

Definitions

  • the invention relates to a Breitnipkalander with a shoe roll having a circumferential jacket and a pressure shoe, and a counter-roller, which forms a nip with the shoe roll together, wherein the pressure shoe is displaceable in the direction of the backing roll and the jacket in a working area of a circular shape out radially deformed outwards.
  • a nip calender is used to satinize a paper or board web.
  • the calendering in the nip calender has the advantage over a calendering in a "normal" calender, which has two cooperating rollers, that the treatment time can be extended, while the compressive stresses prevailing in the nip are usually lower than those in a formed between two rollers nip. This results in the web suffers a smaller volume loss in the nip.
  • the surface properties produced in a nip are quite similar to the surface properties achieved in a "normal" calender.
  • the counter-roller is usually heated.
  • the ruling on the surface of the backing roll temperatures are so high that there is a risk that the coat is damaged when it comes into contact with the counter roll.
  • the material web which is calendered in the nip, is located between the jacket and the counter-roller, the risk of damage is comparatively small because the material web prevents direct contact between the jacket and the counter-roller.
  • care must be taken that contact between the counter-roller and the jacket does not take place.
  • the jacket is pressed by the pressure shoe outwards in the direction of the counter roll, so that the jacket has conical sections in the region of the counter roll at both ends.
  • the invention has for its object to reduce problems in the reeling of webs that have been satined in a wide nip.
  • the jacket dilution compensation deforms one of the surfaces which delimits the broad nip in a direction in which the average surface pressure becomes more uniform. So you set the "thickness" of the wide nip over the entire working width so to speak "constant".
  • the jacket dilution compensation has a decreasing effect in the direction of the axial center of the working region. It can be observed namely that the jacket dilution does not stop abruptly, but the coat from the "kink" at the end of the Anpreßschuhs starting an increasing thickness toward the axial center of the work area learns. For example, the length in which the jacket returns to its normal thickness, about 20 to 35 mm. If one now lets the effect of the material compensation decrease, then the fact is taken into account that with increasing approximation At the axial center of the shell, the thinning of the shell becomes weaker.
  • the jacket has a reinforcing insert.
  • a reinforcing insert which may be formed for example by a fabric layer, causes the jacket can be stretched less here. This limits the elongation to a thickness range of the jacket, which lies radially outside the reinforcing insert. Under favorable circumstances, the sheath is even radially compressed within the reinforcing insert when it is deformed by the pressure shoe. As a result, the total dilution of the shell can be kept slightly smaller, so that you can operate the material dilution compensation with less effort.
  • the reinforcing insert is arranged in the half of the thickness of the shell facing away from the counter-roller.
  • the reinforcing insert may be arranged in a range of 10 to 50% of the thickness of the shell. This avoids a negative influence on the Satinagevorgangs by the reinforcing insert.
  • the jacket dilution compensation preferably acts on the inside of the jacket. There is enough space available, namely inside the shoe roll. Measures that work from the outside are then not necessarily required.
  • the jacket dilution compensation acts on the pressure shoe. By influencing the interaction between the pressure shoe and the jacket can be compensated in the described small orders of magnitude quite a dilution of the shell.
  • the jacket dilution compensation heats the pressure shoe. By heating the pressure shoe increases its volume and then presses, so to speak, more strongly against the counter roll.
  • the jacket dilution compensation generates a reduced contact pressure in the middle region in the direction of the counter-roller.
  • the middle axial region of the working area of the pressure shoe is thus loaded to a lesser extent in the direction of the counter roll, as at the axial ends of the working area.
  • the jacket dilution compensation generates an increased contact pressure at the lateral ends of the working area.
  • the pressure shoe is thus something "bent” or in any case loaded so that the shell dilution is compensated.
  • the jacket dilution compensation preferably produces an enlarged oil cushion between the pressure shoe and the jacket.
  • Such an oil pad is usually present between the pressure shoe and the jacket in order to reduce the friction between the pressure shoe and the jacket. If you now have a larger, i. thicker or with greater force acting oil pad produced at the axial ends of the work area, then you can easily compensate with the help of this thickened oil pad jacket dilution.
  • the pressure shoe it is preferable for the pressure shoe to be thicker in the region of its lateral ends than in a central region.
  • the jacket dilution compensation can also act on the counter roll.
  • the jacket dilution compensation heats the counter-roll, wherein the heating in the region of the lateral ends of the working region is stronger than in a central region of the working region. Where the heating is stronger, the diameter of the counter roll is increased. Since this magnification must be only a few microns, the heating of the counter roll is sufficient. Alternatively or additionally, it is possible to provide the counter-roller with an enlarged diameter range at the axial edge.
  • jacket dilution compensation places a stretch zone of the jacket outside the work area. So you move the dilution caused by the strain, in an area outside the work area.
  • the jacket dilution compensation can also have a thickness measuring device connected downstream of the broad nip, which measures the thickness of a material web passing through the broad nip, wherein the shell dilution compensation changes its effect as a function of the determined thickness. This gives a control loop, which ensures that the material to be satinized over its entire width despite the thinning of the shell receives a constant thickness.
  • a Breitnipkalander 1 has a shoe roll 2, which forms a broad nip 4 with a counter-roller 3 through a web of material not shown is performed to be satined there.
  • the material web is, for example, a web of paper or cardboard.
  • the counter-roller 3 is heated by means not shown.
  • a heat transfer medium can be used, for example a hot liquid or a hot gas, for example steam.
  • a heating from the outside by means of inductive or infrared heaters is possible.
  • the shoe roll 2 has a jacket 5, which is closed at its two axial ends by end plates 6, which are supported by bearings 7 on a stationary axis 8.
  • the jacket 5 is pressed by a pressure shoe 9 in the direction of the counter roll 3, i. through the pressure shoe 9 one is able to act with a certain pressure on the web 4 passing through the material web.
  • the pressure shoe 9 is supported on the axis 8 and is loaded by pressure transducer 10 and above all shifted away from the axis 8, so that the jacket 5, as in Fig. 1 shown deformed from its circular shape. Conical sections 11 then result on the two axial ends because the axially outer ends of the jacket 5 are fastened to the end plates 6 and thus are not displaced further radially outward can be. By this formation of the jacket 5 prevents the jacket 5 comes outside of a working area in which the material web is arranged, with the hot counter roll 3 in contact.
  • Fig. 2 shows now the end portion of the pressure shoe 9 with the jacket 5 and the backing roll 3. Due to the deformation of the shell 5 results in the section 11 an elongation, which is symbolized by a hatched circular segment 12.
  • the strain is not limited to this annulus segment 12, but extends around an edge 13 at the axial end faces of the pressure shoe 9 for about 20 to 35 mm.
  • the material of the jacket 5 has a volume constancy, a reduction in its thickness is associated with the expansion, that is to say an increase in the axial length of the jacket 5. It corresponds to the volume that would additionally be required by the circular ring segment 12. This decrease in thickness is not particularly great. It is in the range of about 2 to 30 microns.
  • Such an error is due neither to a thermal camber of the counter-roller 3 nor to a deformation of the Anspreßschuhs 9 in the edge region. Rather, such an error is mainly due to the above-mentioned thinning of the jacket 5.
  • shell dilution compensation This measure is referred to as "shell dilution compensation" for short. It can be realized in different ways, which are briefly described below.
  • the jacket dilution compensation has an effect which decreases towards the axial center of the counter-roll 3 and is expediently limited to the small edge region on the order of 20 to 50 mm.
  • the shell dilution is precompensated, as it were, i. in the deformed state, the jacket then at least in the work area has the same thickness everywhere.
  • the jacket 5 may have a reinforcing insert 14.
  • a reinforcing insert 14 may be formed for example by a fabric.
  • the reinforcing insert 14 is located in the half of the jacket 5, which faces away from the counter-roller 3. For example, if the sheath has a thickness of 5 mm, then a material thickness of about 3 mm remains from the reinforcing insert 14 to the upper side of the sheath 5, which faces the counter-roll 3.
  • a first measure symbolized by an arrow 15 is, is that one heats the pressure shoe 9 at its axial ends. This leads to a slight thickening of the pressure shoe 9 in the region of its axial ends and thus to a compensation of the thinning of the shell. It can also, as shown by an arrow 16, in the axial center of the pressure shoe a reduced contact force in the direction of the pressure shoe 9 act or at the axial ends, as shown by an arrow 17, an increased contact pressure on the Pressing shoe 9 let act. Both measures cause the broad nip 4 over its axial length (which is the extension parallel to the axis 18 of the mating roll 3) has a constant thickness.
  • the pressure shoe 9 also bulge in a small extent in the direction of the backing roll 3, in particular the fact that the pressure shoe 9 has a slightly larger thickness in this area.
  • the jacket dilution compensation can also be applied to the counter roll 3, for example by means of heating elements 21, which act on the axial end regions of the counter roll 3, ie heat the end regions more strongly than a central region.
  • Such heating leads to an increase in diameter of the counter roll 3 and thus also to a homogenization of the wide nip 4 over its axial length.
  • the smoothness effect at the edge of the web is also sufficient to improve the smoothness effect at the edge of the web.
  • This can be achieved, for example, by zonewise heating of the mating roll, ie more temperature at the edge by the heating elements 21.
  • the higher temperature also increases the smoothness effect.
  • the heating has therefore in addition to the diameter increase an additional effect. Even by a larger applied amount of moisture, ie steam or water, at the edge of the smoothing effect can be increased.
  • the thickness of the material web in particular at the edge region, is measured during production.
  • the jacket dilution compensation is then regulated as a function of the determined thickness of the material web, so that the effects of MantelverPolnung minimized and the cross-profile are equalized.

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  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Claims (18)

  1. Calandre à pinçage prolongé (1) avec un cylindre à sabot (2), qui comprend une enveloppe tournante (5) et un sabot de pressage (9), et un contre-cylindre (3), qui forme un pinçage prolongé (4) avec le cylindre à sabot (2), dans laquelle le sabot de pressage (9) est déplaçable en direction du contre-cylindre (3) et déforme l'enveloppe (5) radialement vers l'extérieur à partir d'une forme circulaire dans une zone de travail, caractérisée en ce que qu'il est prévu une compensation d'amincissement de l'enveloppe.
  2. Calandre à pinçage prolongé selon la revendication 1, caractérisée en ce que la compensation d'amincissement de l'enveloppe comprend une enveloppe (5), qui présente dans la région des extrémités latérales de la zone de travail, une épaisseur plus grande que dans la région centrale de la zone de travail.
  3. Calandre à pinçage prolongé selon la revendication 1 ou 2, caractérisée en ce que la compensation d'amincissement de l'enveloppe déforme une des surfaces, qui délimite le pinçage prolongé (4), dans une direction dans laquelle la pression superficielle moyenne est plus uniforme.
  4. Calandre à pinçage prolongé selon l'une quelconque des revendications 1 à 3, caractérisée en ce que la compensation d'amincissement de l'enveloppe exerce une action qui diminue en direction du milieu axial de la zone de travail.
  5. Calandre à pinçage prolongé selon l'une quelconque des revendications 1 à 4, caractérisée en ce que l'enveloppe (5) comprend un insert de renforcement (14).
  6. Calandre à pinçage prolongé selon la revendication 5, caractérisée en ce que l'insert de renforcement (14) est disposé dans la moitié de l'épaisseur de l'enveloppe (5) éloignée du contre-cylindre (3).
  7. Calandre à pinçage prolongé selon l'une quelconque des revendications 1 à 6, caractérisée en ce que la compensation d'amincissement de l'enveloppe agit sur la face intérieure de l'enveloppe (5).
  8. Calandre à pinçage prolongé selon la revendication 7, caractérisée en ce que la compensation d'amincissement de l'enveloppe agit sur le sabot de pressage (9).
  9. Calandre à pinçage prolongé selon la revendication 8, caractérisée en ce que la compensation d'amincissement de l'enveloppe chauffe le sabot de pressage (9).
  10. Calandre à pinçage prolongé selon l'une quelconque des revendications 1 à 9, caractérisée en ce que la compensation d'amincissement de l'enveloppe produit dans la région centrale une force de pression réduite en direction du contre-cylindre (3).
  11. Calandre à pinçage prolongé selon la revendication 10, caractérisée en ce que la compensation d'amincissement de l'enveloppe produit une force de pressage accrue sur les extrémités latérales de la zone de travail.
  12. Calandre à pinçage prolongé selon l'une quelconque des revendications 1 à 11, caractérisée en ce que la compensation d'amincissement de l'enveloppe produit un coussin d'huile accru entre le sabot de pressage (9) et l'enveloppe (5).
  13. Calandre à pinçage prolongé selon l'une quelconque des revendications 1 à 12, caractérisée en ce que le sabot de pressage (9) est en plus saillant en direction du contre-cylindre (3) dans la région des extrémités latérales de la zone de travail.
  14. Calandre à pinçage prolongé selon la revendication 13, caractérisée en ce que le sabot de pressage (9) est plus épais dans la région de ses extrémités latérales que dans une région centrale.
  15. Calandre à pinçage prolongé selon l'une quelconque des revendications 1 à 14, caractérisée en ce que la compensation d'amincissement de l'enveloppe agit sur le contre-cylindre (3).
  16. Calandre à pinçage prolongé selon la revendication 15, caractérisée en ce que la compensation d'amincissement de l'enveloppe chauffe le contre-cylindre (3), le chauffage étant plus fort dans la région des extrémités latérales de la zone de travail que dans une région centrale de la zone de travail.
  17. Calandre à pinçage prolongé selon l'une quelconque des revendications 1 à 16, caractérisée en ce que la compensation d'amincissement de l'enveloppe comprend un dispositif de mesure d'épaisseur installé après le pinçage prolongé (4), qui mesure l'épaisseur d'une bande de matière traversant le pinçage prolongé, la compensation d'amincissement de l'enveloppe faisant varier son action en fonction de l'épaisseur déterminée.
  18. Procédé de satinage d'une bande de matière dans une calandre à pinçage prolongé avec un cylindre à sabot, qui comprend une enveloppe tournante et un sabot de pressage, et un contre-cylindre, qui forme un pinçage prolongé avec le cylindre à sabot, dans lequel on déplace le sabot de pressage en direction du contre-cylindre et on déforme l'enveloppe radialement vers l'extérieur à partir d'une forme circulaire dans une zone de travail, caractérisée en ce que l'on compense un amincissement de l'enveloppe.
EP05104597A 2004-06-22 2005-05-30 Calandre à pincage prolongée et procédé de satinage d' une bande de matériau Active EP1609907B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004030008 2004-06-22
DE102004030008A DE102004030008A1 (de) 2004-06-22 2004-06-22 Breitnipkalander und Verfahren zum Satinieren einer Materialbahn

Publications (2)

Publication Number Publication Date
EP1609907A1 EP1609907A1 (fr) 2005-12-28
EP1609907B1 true EP1609907B1 (fr) 2008-02-20

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EP05104597A Active EP1609907B1 (fr) 2004-06-22 2005-05-30 Calandre à pincage prolongée et procédé de satinage d' une bande de matériau

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EP (1) EP1609907B1 (fr)
AT (1) ATE386839T1 (fr)
DE (2) DE102004030008A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE364750T1 (de) * 2001-04-18 2007-07-15 Stowe Woodward Ag Schuhpressenbelt
DE10204286B4 (de) * 2002-02-02 2006-02-02 Voith Paper Patent Gmbh Kalander und Verfahren zum Betreiben eines Kalanders
DE10255715B4 (de) * 2002-11-29 2006-08-31 Voith Paper Patent Gmbh Breitnip-Kalander und Mantel für einen Breitnip-Kalander
DE10259442C5 (de) * 2002-12-19 2008-01-03 Voith Patent Gmbh Breitnip-Kalander

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DE502005002876D1 (de) 2008-04-03
ATE386839T1 (de) 2008-03-15
EP1609907A1 (fr) 2005-12-28
DE102004030008A1 (de) 2006-01-12

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