EP1688537B1 - Calandre - Google Patents

Calandre Download PDF

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Publication number
EP1688537B1
EP1688537B1 EP05111227A EP05111227A EP1688537B1 EP 1688537 B1 EP1688537 B1 EP 1688537B1 EP 05111227 A EP05111227 A EP 05111227A EP 05111227 A EP05111227 A EP 05111227A EP 1688537 B1 EP1688537 B1 EP 1688537B1
Authority
EP
European Patent Office
Prior art keywords
cooling fluid
heating device
web
calender according
nip
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
EP05111227A
Other languages
German (de)
English (en)
Other versions
EP1688537A1 (fr
Inventor
Peter Dr. Wiemer
Hans-Rolf Conrad
Frank Levi
Ulrich Rothfuss
Thomas Hermsen
Josef Schneid
Joachim Hinz
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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1688537A1 publication Critical patent/EP1688537A1/fr
Application granted granted Critical
Publication of EP1688537B1 publication Critical patent/EP1688537B1/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

Definitions

  • the invention relates to a calender with at least two rollers, which together form a nip and one of which is designed as a heating roller having an inductive heating device.
  • Such a calender serves to treat a material web, in particular a paper or board web. As the web passes through the nip, it is subjected to increased pressure and temperature.
  • the heating roller generally has a hard and smooth surface, so that the voltage applied to the heating roller side of the web is smoothed.
  • the other roll is often a soft roll, i. it has an elastic cover, or it is formed as a jacket of a shoe roll.
  • a known embodiment of a heating roller uses a heat transfer fluid, which is guided by axial channels of the heating roller, which are usually formed as peripheral bores.
  • a heat transfer fluid which is guided by axial channels of the heating roller, which are usually formed as peripheral bores.
  • heat transfer fluid finds its limits in the heat transportability of the heat transfer fluid used. For example, you can only heat water to below the evaporation temperature. Even oil that can be made hotter has a limit temperature.
  • gaseous Heat transfer media such as water vapor, is not possible in all cases.
  • the invention has for its object to expand the heating options.
  • This object is achieved in a calender of the type mentioned above in that the heater acts outside of the nip through a web of material on a region of the heating roller, which is covered in operation by a nip passing through the material web.
  • the heater is arranged in front of the nip. It is therefore ensured that the nip continuous material web has been brought to the desired temperature.
  • the heating device is associated with a deflection roller, which guides the material web in front of the heating device to the periphery of the heating roller. So you created a material web section in which the Material web over a predetermined angular range of for example 60 ° or more rests on the periphery of the heating roller. In this area, then the heater can act on the heating roller.
  • the heating roller is arranged between two rollers, wherein the material web is guided between a nip in front of the heating device and the deflection roller assigned to the heating device via a further deflection roller.
  • the previously known by calenders geometry of the web guide can be largely maintained at the output of the nip in front of the heater.
  • the material web can be led out of the nip in a relatively straight line. The fact that you now have free features of the web, can be longer compensate for changes in length, which may suffer the material in the nip, better.
  • the heater has an inductor arrangement with at least two conductors extending along the axial length of the heating roller.
  • the two conductors of the inductor arrangement form a loop, so that the two conductors are each traversed by a current in the opposite direction.
  • the current is usually an alternating current.
  • Such an inductor arrangement can quite temperatures of the order of 200 ° C to 250 ° C at the surface of the heat roller produce. If these temperatures can act directly on the surface of the web, a relatively high operating speed of the calender can be achieved.
  • the heating device is combined with a nozzle moistener arrangement in a structural unit.
  • a nozzle moistener assembly applies moisture to the surface of the web. The moisture serves to improve the surface properties in the following nip. If the nozzle moistener arrangement is controlled zone by zone in the transverse direction of the material web, then the nozzle moistener arrangement can also be used to even out a moisture profile of the material web.
  • the combination of the heater with the nozzle moistener assembly has the great advantage that the moisture is applied to the web at a location where the web is sure to have a very high temperature. The higher the temperature of the material web, the faster and better the moisture can penetrate into the interior of the material web.
  • the heating device has at least one cooling fluid channel, which communicates with a cooling fluid connection.
  • the power density in the heater is relatively high.
  • the cooling fluid channel has at least one cooling fluid outlet opening which is directed towards the heating roller. Cooling fluid can now impinge on the material web lying against the heating roller through the cooling fluid outlet opening. As will be explained in more detail below, this possibility can be used for different purposes.
  • each cooling fluid outlet opening or each group of cooling fluid outlet openings is assigned a respective valve. So you can control the exit of the cooling fluid zones and thus use the cooling fluid to other possibilities.
  • the term "cooling fluid” here refers to the function that the cooling fluid has in the heater. With respect to the material web, to which the cooling fluid is then directed, the cooling fluid can act quite heating. If, for example, air or another gas is used as the cooling fluid, then one can use an increased amount of air Air pressure, which is provided by already warmed air, press the web to the roll surface. As a result, the heat transfer from the heating roller to the material web is improved. If you control this pressure zone by zone, then you can quite achieve differences in heat transfer from the heat roller to the web across the web direction.
  • the cooling fluid outlet openings are designed as atomizer nozzles and the cooling fluid is water.
  • the cooling fluid outlet openings form part of the nozzle moistener arrangement.
  • This nozzle moistener arrangement is supplied with already heated water. Heated water penetrates the web more easily than colder water.
  • the valves are connected to a controller which is connected to a sensor arrangement which determines at least one predetermined parameter of the material web in the width direction. It can be achieved with the targeted control of the cooling fluid that this parameter of the web, for example, gloss, smoothness, moisture or the like, in the width direction of the web receives a predetermined profile.
  • this parameter of the web for example, gloss, smoothness, moisture or the like
  • this parameter of the web for example, gloss, smoothness, moisture or the like
  • the valves are connected to a supply device of the inductor arrangement which opens the valves when the conductors are de-energized. If the conductors are de-energized, then there is no heating of the surface of the heating roller. In this case, it makes sense to cool this surface as quickly as possible.
  • the hitherto dreaded quenching effect of hitting a cold cooling fluid on the surface of the roll occurs does not occur so much in the present case, because the cooling fluid initially absorbs the heat from the heater. It thus strikes the surface of the roll when heated and cools it down in a manner similar to that of the heater itself.
  • a cleaning device is arranged on a side of the heating roller opposite the heating device. This cleaning device is particularly advantageous if water is used as the cooling fluid.
  • Fig. 1 shows a calender 1 with a stack of rollers, which is formed in the present embodiment of three rollers 2, 3, 4. In principle, two rollers 3, 4 are sufficient. There may also be more than the illustrated three rollers 2-4.
  • a nip 5 is formed through which a material web 6 is guided is.
  • the material web 6 is guided by a further nip 7, which is formed between the heating roller 3 and the roller 4 located underneath.
  • the material web 6 in the nips 5, 7 with increased pressure and, as will be explained below, also subjected to elevated temperature. At least in nip 7, the increased temperature is provided.
  • the heating roller 3 is designed as a hard roller with a smooth, hard, so non-compliant surface.
  • the two rolls 2, 4 may be formed as "soft" rolls, i. These are rollers that carry an elastic coating on their surface.
  • the rollers 2, 4 can also be replaced by shoe rollers or circulating belts, so that the nips 5, 7 are then formed as so-called broad nips.
  • the material web 6, which runs in the direction of an arrow 8, is led out substantially straight from the upper nip 5 and passed around a guide roller 9, as is known from conventional calenders ago.
  • a second guide roller 10 which leads the material web 6 relatively far, for example 60 °, before the nip 7 to bear against the heating roller 3.
  • the material web 6 is guided over a further deflection roller 11, so that it can be guided by a further nip, which is for example formed between the lower roller 4 and an underneath, not shown roller.
  • a heating device 12 is arranged in the area where the material web 6 rests on the circumference of the heating roller 3.
  • the heating device 12 forms with the heating roller 3 an air gap 13, through which the material web 6 is guided.
  • the air gap 13 is drawn exaggerated here for reasons of representability. In reality, the length of the air gap 13, so the distance between the heater 12 and the surface 19 of the heat roller 3, only a few millimeters or even only a few tenths of a millimeter. In any case, it is so large that the material web 6 can rest against the heating roller 3 without contact with the heating device 12.
  • the heating device 12 is designed as an inductive heating device, which acts through the material web 6 on the surface 14 of the heating roller 3.
  • the heater 12 generates a time-varying magnetic field. Such a magnetic field induces eddy currents in the surface 14. These eddy currents generate an electrical power loss, which is converted into heat.
  • the heat leads to an increase in temperature of the surface 14 of the heating roller 3. This temperature increase takes place exactly where the material web 6 rests against the heating roller 3. The heat generated by the eddy currents is thus transmitted directly to the web 6.
  • the guide roller 10 supports the guidance of the material web 6 to the heating roller so that the heated area of the surface 14 of the heating roller 3 is covered by the material web 6.
  • Fig. 2 shows a section of the heating roller 3 with the heater 12 in more detail.
  • the heating device has a yoke 15, in which schematically illustrated electrical conductors 16, 17 are arranged.
  • the conductors 16, 17 are electrically insulated from the yoke 15. They are each out of phase or in opposite directions by a current, in particular an alternating current flows through.
  • the yoke 15 has an upper leg 18, a middle leg 19 and a lower leg 20.
  • the middle leg 19 separates the two conductors 16, 17.
  • the area 21 is only drawn in to illustrate this induction. Of course, eddy currents also occur in the circumferential direction adjacent to the region 21.
  • the yoke 15 is penetrated by a cooling fluid channel 22.
  • the cooling fluid channel 22 is in communication with a cooling fluid port, can be pumped through the cooling fluid channel 22 by the continuous cooling fluid.
  • the cooling fluid flowing through the cooling fluid passage 22 dissipates heat from the heater 12.
  • cooling fluid outlet openings 23 From the cooling fluid channel 22 branch off a plurality of cooling fluid outlet openings 23.
  • the cooling fluid outlet openings are directed towards the heating roller 3. You can, like this in Fig. 2 is shown schematically, be formed like a nozzle. If water is used as the cooling fluid, then the cooling fluid outlet opening 23 is formed as a spray nozzle, so that the exiting from the cooling fluid channel 22 cooling fluid is atomized in the direction of the heating roller and thus in the direction of the voltage applied to the heating roller material web 6.
  • a control device 26 controls the opening of the valve 24, 25.
  • the control device 26 can be actuated for example by means of a sensor 27 which determines a predetermined parameter in the width direction of the web, for example, smoothness, gloss, moisture, thickness, etc.
  • the material web 6 can be pressed against the surface 14 of the heating roller 3 by a high air pressure, which can be provided by already heated air. This results in an improved heat transfer.
  • the surface 14 of the heating roller 3 can be cooled by the cooling air of the heater. This can be done both with surface-mounted material web 6 and without material web 6. Since the heating roller 3 has been heated until the heating device has been switched off and heat has also been supplied to the heating device 12 up to this moment, this design has the advantage that initially heated air is blown onto the surface 14 of the roller 3 (or the lying thereon web 6) is blown. Accordingly, the roller 3 does not get a temperature shock.
  • the cooling air which is ejected through the cooling fluid outlet opening 23
  • the temperature of the heater 12 also has an influence on the temperature at the surface 14 of the heating roller. 3
  • the material web 6 can be profiled with respect to gloss, as is known from nozzle moisturers. However, the moisture is applied here directly where the material web 6 receives its highest temperature. This considerably improves the absorption capacity of the material web 6 for the moisture.
  • the water can also be applied to the roller for cleaning purposes.
  • a cleaning device 28 is disposed on the opposite side of the heater 12.

Landscapes

  • Paper (AREA)
  • Fixing For Electrophotography (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Lubricants (AREA)

Claims (13)

  1. Calandre pour le traitement d'une bande de matière avec au moins deux rouleaux (2, 3, 4), qui forment ensemble une ligne de contact et dont l'un est un rouleau chauffant (3), qui comporte un dispositif de chauffage par induction (12), caractérisée en ce que le dispositif de chauffage (12) agit à l'extérieur de la ligne de contact (7) à travers la bande de matière (6) dans une zone (21) du rouleau chauffant (3) qui est couverte, en fonctionnement, par la bande de matière (6) franchissant la ligne de contact (7).
  2. Calandre selon la revendication 1, caractérisée en ce que le dispositif de chauffage (12) est disposé avant la ligne de contact (7).
  3. Calandre selon la revendication 1 ou 2, caractérisée en ce que le dispositif de chauffage (12) est associé à un rouleau de déviation (10), qui guide la bande de matière (6) sur le pourtour du rouleau chauffant (3) avant le dispositif de chauffage (12).
  4. Calandre selon la revendication 3, caractérisée en ce que le rouleau chauffant (3) est disposé entre deux rouleaux (2, 4), dans laquelle la bande de matière (6) est guidée sur un autre rouleau de déviation (9) entre une ligne de contact (5) avant le dispositif de chauffage (12) et le rouleau de déviation (10) associé au dispositif de chauffage (12).
  5. Calandre selon l'une quelconque des revendications 1 à 4, caractérisée en ce que le dispositif de chauffage (12) comprend un agencement d'inducteur avec au moins deux conducteurs (16, 17), qui s'étendent le long de la longueur axiale du rouleau chauffant (3).
  6. Calandre selon l'une quelconque des revendications 1 à 5, caractérisée en ce que le dispositif de chauffage (12) est combiné avec un dispositif d'humidification à buses en une unité de construction.
  7. Calandre selon l'une quelconque des revendications 1 à 6, caractérisée en ce que le dispositif de chauffage (12) comprend au moins un canal de fluide de refroidissement (22), qui est en communication avec un raccord de fluide de refroidissement.
  8. Calandre selon la revendication 7, caractérisée en ce que le canal de fluide de refroidissement (22) présente au moins une ouverture de sortie de fluide de refroidissement (23), qui est orientée vers le rouleau chauffant (3).
  9. Calandre selon la revendication 8, caractérisée en ce qu'une soupape (24, 25) est associée à chaque ouverture de sortie de fluide de refroidissement (23) ou à chaque groupe d'ouvertures de sortie de fluide de refroidissement (23).
  10. Calandre selon la revendication 8 ou 9,
    caractérisée en ce que les ouvertures de sortie de fluide de refroidissement (23) se présentent sous la forme de buses de pulvérisation et le fluide de refroidissement est l'eau.
  11. Calandre selon la revendication 9 ou 10, caractérisée en ce que les soupapes (24, 25) sont reliées à une commande (26), qui est reliée à un agencement de capteurs (27), qui détermine au moins un paramètre prédéterminé de la bande de matière (6) dans le sens de la largeur.
  12. Calandre selon l'une quelconque des revendications 9 à 11, caractérisée en ce que les soupapes (24, 25) sont reliées à un dispositif d'alimentation de l'agencement d'inducteur, qui ouvre les soupapes (24, 25) lorsque les conducteurs (16, 17) sont sans courant.
  13. Calandre selon l'une quelconque des revendications 1 à 12, caractérisée en ce qu'un dispositif de nettoyage (28) est disposé sur un côté du rouleau chauffant (3) opposé au dispositif de chauffage (12).
EP05111227A 2005-02-04 2005-11-24 Calandre Not-in-force EP1688537B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005005105A DE102005005105A1 (de) 2005-02-04 2005-02-04 Kalander

Publications (2)

Publication Number Publication Date
EP1688537A1 EP1688537A1 (fr) 2006-08-09
EP1688537B1 true EP1688537B1 (fr) 2010-02-17

Family

ID=36215816

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05111227A Not-in-force EP1688537B1 (fr) 2005-02-04 2005-11-24 Calandre

Country Status (3)

Country Link
EP (1) EP1688537B1 (fr)
AT (1) ATE458086T1 (fr)
DE (2) DE102005005105A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6287424B1 (en) * 1998-09-22 2001-09-11 International Paper Company Method for finishing paperboard to achieve improved smoothness
WO2000040798A1 (fr) * 1998-12-30 2000-07-13 The Goodyear Tire & Rubber Company Chauffage par induction de surfaces de rouleaux de calandre
DE10157691B4 (de) * 2001-11-24 2005-12-22 Voith Paper Patent Gmbh Kalander und Verfahren zum Glätten einer Faserstoffbahn
DE10216539B4 (de) * 2002-04-15 2006-03-09 Voith Paper Patent Gmbh Kalander
DE10256998B4 (de) * 2002-12-06 2006-04-06 Voith Paper Patent Gmbh Breitnipkalander

Also Published As

Publication number Publication date
DE502005009031D1 (de) 2010-04-01
ATE458086T1 (de) 2010-03-15
DE102005005105A1 (de) 2006-08-10
EP1688537A1 (fr) 2006-08-09

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